Aikyam-Lab/Synoptic-Bench huggingface dataset:
801 PM EST TUE DEC 1 2015 LOW PRESSURE OFF THE DELAWARE COAST. SLOWLY PUSHING A WARM FRONT THROUGH THE AREA THIS EVENING. A COLD FRONT WILL CROSS THE REGION LATE WEDNESDAY AFTERNOON INTO WEDNESDAY NIGHT.
607 PM CST TUE DEC 1 2015 12Z UA ANALYSIS HAS AN 850MB LOW IN SOUTHWEST MINNESOTA WITH AN 850 MB COLD FRONT FROM UPPER MICHIGAN. A TROF RAN FROM THE LOW INTO SOUTHWEST KANSAS. THE MAIN FRONT RAN EAST FROM THE LOW ACROSS WISCONSIN AND THEN SOUTH INTO OHIO AND THEN MISSISSIPPI. PAVEMENT TEMPERATURES ARE ABOVE FREEZING SO THE SNOW SHOULD MELT ON THE ROADS. THERE MAY BE A LULL IN ACTIVITY LATE THIS EVENING BEFORE NEW SNOW SHOWERS DEVELOP ACROSS THE AREA AS THE UPPER LOW MOVES INTO WISCONSIN. LARGE SCALE RIDGING WILL TURN TO SW FLOW LATE DURING THE WEEK. MODERATION UNDER THIS RIDGE ALONG WITH THE SW FLOW WILL LEAD TO WELL ABOVE NORMAL TEMPERATURES.
HOWEVER WITH TEMPERATURES AROUND FREEZING AND NOT TOO MUCH BLOWING AND DRIFTING SO HAVE DECIDED TO CANCEL ADVISORY WITH AFTERNOON PACKAGE. A RIDGE BUILDS ACROSS THE REGION WITH DRY CONDITIONS EXPECTED.
CHATTANOOGA AIRPORT, TN 52 58 36 52 / 100 60 10 0 KNOXVILLE MCGHEE TYSON AIRPORT, TN 52 58 35 48 / 100 60 10 0 OAK RIDGE, TN 52 57 34 50 / 90 40 10 0 TRI CITIES AIRPORT, TN 52 57 33 46 / 100 90 20 10 NC.
527 PM CST TUE DEC 1 2015 LARGE UPPER LOW CENTERED OVER THE IOWA GREAT LAKES WILL CONTINUE TO WOBBLE TO THE EAST. LIGHT TO MODERATE SNOW CONTINUES TO ROTATE AROUND THE UPPER LOW. GIVEN HOW WET THE SNOWFALL HAS BEEN WITH TEMPERATURES NEAR FREEZING. TEMPERATURES ARE EXPECTED TO REMAIN NEAR OR EVEN ABOVE FREEZING. SKIES CLEAR FROM WEST TO EAST BY EARLY WEDNESDAY AFTERNOON AS THE LOW EXITS INTO THE SOUTHERN GREAT LAKES AND RIDGING BUILDS OVER THE HIGH PLAINS. IT WILL BE A FEW DEGREES COOLER THAN TODAY. AND SHOULD CONTINUE TO BRING WARMER THAN NORMAL TEMPERATURES TO THE REGION.
WINDS SHOULD INCREASE SLIGHTLY BY LATE TOMORROW MORNING AS A WEAK COLD FRONT MOVES THROUGH THE REGION. HIGH CLOUDS ARE STREAMING OVER THE REGION FROM THE SOUTHWEST AHEAD OF A LONGWAVE TROUGH AXIS OVER THE FOUR CORNER REGION PER LATEST WATER VAPOR AND RAP ANALYSIS. SURFACE OBSERVATIONS THIS AFTERNOON PLACE A WEAK COLD FRONT/DRYLINE OVER THE PANHANDLE OF TEXAS CHARACTERIZED WITH LOW TEENS DEWPOINTS TO THE WEST OF THE BOUNDARY AND 30S/40S DEWPOINTS TO THE EAST. THE LOWER LEVELS PER NAM/GFS SOUNDINGS SUGGEST IT WILL QUITE DIFFICULT FOR PRECIPITATION TO REACH THE GROUND. THE CLEARING OVERNIGHT AND THE DRIER AIR MOVING IN WILL ALLOW FOR A COOLER MORNING AND HAVE GONE BELOW SUPERBLEND VALUES THAT ARE MORE IN LINE WITH ENSEMBLE MEANS WHICH LINE UP TOWARDS RAW MAV/MET MOS. HIGHS SHOULD REACH INTO THE LOW TO UPPER 60S.
THE STRONG UPPER DISTURBANCE CHARACTERIZED BY A 500MB LOW OVER THE CNTRL/NRN PLAINS AND A TROUGH AXIS EXTENDING SWD ACRS THE SRN PLAINS. AS THE UPPER TROUGH MOVES EWD. THE ERN CWA/MSA WL REMAIN UNDER THE RRQ OF THE FOREGOING SUBTROPICAL JET STREAK/EAST OF THE 500MB TROUGH OVERNIGHT AND THUS WL RETAIN SLIGHT CHANCE FOR LGT RAIN/SHOWERS FOR THE ERN CWA/MSA. COOLER TEMPERATURES EXPECTED WEDNESDAY NGT.
546 PM CST TUE DEC 1 2015 LARGE UPPER LOW CONTINUES TO SPIN ACROSS THE AREA AND AS OF THIS AFTERNOON WAS CENTERED OVER NORTHERN IOWA AND COVERED A LARGE PORTION OF THE NATION'S MIDWEST AND NORTHERN PLAINS. AS THE LOW CONTINUES TO DEPART TO THE NORTHEAST. SCATTERED LIGHT SNOW CONTINUE TO FALL IN POCKETS ACROSS THE REGION AS VORT LOBES CIRCULATE AROUND THE LOW. RELATIVELY QUIET WEATHER IS EXPECTED THROUGH THE SHORT TERM FORECAST ONCE THE UPPER LOW DEPARTS. WEAK UPPER LEVEL RIDGING WILL BUILD OVERHEAD THROUGH THE REMAINDER OF THE WORK/SCHOOL WEEK ALLOWING TEMPERATURES TO MODERATE TO NEAR NORMAL FOR THIS TIME OF THE YEAR.
529 PM CST TUE DEC 1 2015 The Upper Level low that sat over the southwestern portions of the US through the weekend is finally on its way out. This upper level low will continue to move north and east through the short term. This may help keep overnight lows a tad warmer, especially over central Missouri and the eastern Ozarks. As the upper level low continues to move eastward, a dry northwest flow will develop and continue through late week.
THE COLD FRONT HAS INCHED ITS WAY EASTWARD TODAY AND HAS JUST PASSED THRU BHM. COOLER AND DRIER AIR IS ALREADY WORKING ITS WAY INTO THE NORTHWEST COUNTIES AS TEMPS/DEW POINTS HAVE FALLEN INTO THE LOW 50S. THE UPPER LOW WILL CONTINUE ITS TREK EASTWARD ACROSS THE GREAT LAKES REGION ON WEDNESDAY FINALLY PUSHING THE FRONT OUT OF CENTRAL ALABAMA WEDNESDAY AFTERNOON. WITH THE HIGHEST TOTALS GENERALLY BETWEEN INTERSTATES 59 AND 85.
925 PM CST TUE DEC 1 2015 WATER VAPOR IMAGERY SHOWS A LARGE UPPER LEVEL LOW SPINNING OVER THE UPPER MIDWEST THIS EVENING.
859 PM MST TUE DEC 1 2015 MID AND HIGH LEVEL DECK OF CLOUDS SLOW TO MOVE OUT ALONG AND EAST FOR THE FRONT RANGE THIS EVENING AS MOISTURE CONTINUES TO WRAP BACK INTO COLORADO AROUND A DEEP UPPER LOW SPIRALING OVER THE NRN GREAT PLAINS THIS EVENING. AS THE LOW MOVES EAST. THERE IS A BATCH OF MIDDLE AND HIGH CLOUDS MOVING SOUTHWARD ACROSS MUCH OF THE CWA ON THE BACK SIDE OF THE UPPER LOW THAT IS CENTERED OVER THE UPPER MISSISSIPPI VALLEY. WEDNESDAY'S HIGHS ARE UP FROM THIS AFTERNOON'S 4-6 C WARMER.
605 PM EST TUE DEC 1 2015 LOW PRESSURE OVER MINNESOTA WILL SLOWLY WEAKEN AS IT MOVES EASTWARD INTO THE CENTRAL GREAT LAKES BY WEDNESDAY MORNING. ON WEDNESDAY A TROUGH OF LOW PRESSURE WILL SLIDE ACROSS THE AREA.
643 PM EST TUE DEC 1 2015 AVIATION A LOW PRESSURE SYSTEM OVER IOWA WILL TRACK SLOWLY EAST THROUGH WEDNESDAY. HIGH PRESSURE WILL THEN BUILD IN FROM THE WEST RESULTING IN GENERALLY DRY WEATHER INTO THE WEEKEND. OVERALL THIS SYSTEM LOOKS ON THE WARM SIDE DURING THE DAY ON WEDNESDAY WITH ABOVE FREEZING TEMPERATURES.
THE COLD FRONT WAS CONTINUING TO BE THE FOCUSING MECHANISM FOR OVERRUNNING PRECIP ACROSS THE FORECAST AREA. THE ANALYZED LOCATION OF THE COLD FRONT THROUGH THE FORECAST AREA AT 20Z HAD IT GENERALLY ALONG AND SLIGHTLY WEST OF INTERSTATE 65 ACROSS THE AREA. TEMPS WERE RANGING FROM THE LOWER 60S ACROSS NORTHEAST ALABAMA. TO THE LOW TO MID 50S FROM HSV TO MSL. THE SHORT TERM MODELS ARE IN GOOD AGREEMENT INVOLVING THE UPPER LOW MOVING EASTWARD ACROSS THE GREAT LAKES REGION. COLD ADVECTION WILL CONTINUE TO MOVE INTO THE TENNESSEE VALLEY REGION ON WEDNESDAY NIGHT IN THE WAKE OF THE UPPER LOW MOVING INTO THE NORTHEAST U.
308 PM MST TUE DEC 1 2015 UPPER LOW OVER THE MIDWEST THIS AFTERNOON. WITH WEAK ENERGY ROTATING SOUTHWARD THROUGH THE HIGH PLAINS PRODUCING SOME MID/HIGH LEVEL CLOUDINESS OVER THE NORTHERN HALF OF COLORADO. UPPER LOW PULLS AWAY TOWARD THE GREAT LAKES WITH N-NW FLOW PERSISTING ACROSS COLORADO. UPPER RIDGE BUILDS OVER THE CENTRAL ROCKIES.
This evening, a large upper level trough is progressing eastward from the Great Lakes southward to the southern plains. At the surface, a cold front was draped from the Ohio Valley southward to Mississippi. Guidance also insists on fog developing across the area later tonight, although the high clouds currently streaming across the area are a limiting factor. Overnight lows will be mild ahead of the front, generally in the lower 60s.
ENDING FROM NW TO SE OVERNIGHT AS THE TROF AXIS AND SECONDARY SURGE OF COOLER AIR MOVES EASTWARD ACROSS TX INTO OUR REGION. H85 TROF AXIS. WILL FINALLY BE DRIVEN THROUGH AS THE EXPANSIVE UPPER LOW/TROF OVER THE PLAINS/UPPER MIDWEST TRANSLATES EASTWARD. USHERING DRIER AND COOLER AIR INTO THE REGION. BUT THIS SHOULD NOT PRECLUDE TEMPS FROM RISING INTO THE LOWER/MID 60S. WHICH SAW FREEZING OR SUB FREEZING TEMPERATURES ACROSS PARTS OF EAST TX AND CENTRAL LA.
545 PM EST TUE DEC 1 2015 AN UPPER LOW OVER THE PLAINS STATES WILL SLIDE ACROSS THE GREAT LAKES THROUGH MIDWEEK. RAIN WILL CONTINUE TO FALL UNTIL LATE WEDNESDAY WHEN A COLD FRONT WILL PUSH THROUGH.
/ISSUED BY NATIONAL WEATHER SERVICE HUNTSVILLE AL/ RAINFALL IS TEMPORARILY SUBSIDING NEAR THE MS RIVER AS OF 21Z/3 PM CST, AS THE MAIN COLD FRONT SHIFTS MOSTLY EAST OF THE MISSISSIPPI- ALABAMA BORDER. THE LARGE PARENT UPPER LOW CONTINUES TO MAKE SLOW PROGRESS OVER THE UPPER MISSISSIPPI VALLEY. TEMPERATURES WILL GRADUALLY MODERATE AS RIDGING BUILDS ALOFT, BUT NIGHTS WILL REMAIN SLIGHTLY BELOW NORMAL WITH LOWS FALLING INTO THE LOWER AND MIDDLE 30S AT TIMES IN NE MISSISSIPPI.
709 PM EST TUE DEC 1 2015 LOW PRESSURE OVER MINNESOTA WILL SLOWLY WEAKEN AS IT MOVES EASTWARD INTO THE CENTRAL GREAT LAKES BY WEDNESDAY MORNING. ON WEDNESDAY A TROUGH OF LOW PRESSURE WILL SLIDE ACROSS THE AREA.
LIGHT EAST WINDS 10 KTS OR LESS THIS EVENING VEER SSW OVERNIGHT AHEAD OF APPROACHING COLD FRONT. INTRODUCED VCSH LATE WED AFTN WITH SHOWERS PRECEDING THE APPROACHING COLD FRONT UNDER SW FLOW.
RAIN REMAINS ON THE NORTHERN SIDE OF THE COLD FRONT THIS EVENING SO ANY THUNDERSTORMS HAVE BEEN ELEVATED AND ARE NOW2 GENERALLY IN THE NORTHEAST. A COLD FRONT. 88 A SLOW MOVING COLD FRONT WILL BRING WIDESPREAD RAIN TO NORTH CENTRAL ALABAMA TONIGHT.
AS A LOW PRESSURE TROUGH MOVES THROUGH THE REGION.
/ISSUED 243 PM CST TUE DEC 1 2015/ MIDAFTERNOON GOES WATER VAPOR IMAGERY SHOWED A LARGE UPPER LEVEL LOW CENTERED JUST NORTH OF OMAHA. ALTHOUGH THE UPPER LOW HAD SHOWN LITTLE MOVEMENT SINCE EARLY THIS MORNING. AROUND THE WESTERN PERIPHERY OF THE UPPER LOW.
The Upper Level low that sat over the southwestern portions of the US through the weekend is finally on its way out. This upper level low will continue to move north and east through the short term. This may help keep overnight lows a tad warmer, especially over central Missouri and the eastern Ozarks. As the upper level low continues to move eastward, a dry northwest flow will develop and continue through late week.
HIGH PRESSURE ALOFT WILL SETTLE INTO THE GREAT BASIN FOR THE MIDWEEK PERIOD.
A FEW AREAS OF SNOW CONTINUE TO WRAP AROUND THE LOW INTO THE JAMES RIVER VALLEY. UPPER LOW WILL CONTINUE TO PUSH OFF TO THE EAST WITH SNOW CONTINUING TO TAPER OFF. QUIET WEATHER IS EXPECTED AS RIDGE BUILDS IN BEHIND THE DEPARTING LOW. AN UPPER LEVEL RIDGE IS ESTABLISHED OVER THE ROCKIES WEDNESDAY NIGHT. BRINGING A WEAK AND DRY COLD FRONT ACROSS THE AREA.
935 PM EST TUE DEC 1 2015 A WARM FRONT OVER THE CAROLINAS WILL CONTINUE TO DRIFT NORTH INTO THE AREA TONIGHT. A COLD FRONT WILL SWING THROUGH THE MID- ATLANTIC WEDNESDAY AFTERNOON AND EVENING.
659 PM EST TUE DEC 1 2015 PERIODS OF RAIN AND DRIZZLE WILL BE COMMON THROUGH WEDNESDAY AS A SERIES OF LOW PRESSURE SYSTEMS MOVE ACROSS THE REGION.
ISSUED BY NATIONAL WEATHER SERVICE HUNTSVILLE AL 412 PM CST TUE DEC 1 2015 RAINFALL IS TEMPORARILY SUBSIDING NEAR THE MS RIVER AS OF 21Z/3 PM CST, AS THE MAIN COLD FRONT SHIFTS MOSTLY EAST OF THE MISSISSIPPI- ALABAMA BORDER. THE LARGE PARENT UPPER LOW CONTINUES TO MAKE SLOW PROGRESS OVER THE UPPER MISSISSIPPI VALLEY. TEMPERATURES WILL GRADUALLY MODERATE AS RIDGING BUILDS ALOFT, BUT NIGHTS WILL REMAIN SLIGHTLY BELOW NORMAL WITH LOWS FALLING INTO THE LOWER AND MIDDLE 30S AT TIMES IN NE MISSISSIPPI.
THERE IS A BATCH OF MIDDLE AND HIGH CLOUDS MOVING SOUTHWARD ACROSS MUCH OF THE CWA ON THE BACK SIDE OF THE UPPER LOW THAT IS CENTERED OVER THE UPPER MISSISSIPPI VALLEY. WEDNESDAY'S HIGHS ARE UP FROM THIS AFTERNOON'S 4-6 C WARMER.
COLD AIR ADVECTION AND SOME CLEARING UP NORTH WILL DIP OVERNIGHT LOWS WELL INTO THE LOWER 40S IN THE NORTHERN COUNTIES. /ISSUED 520 PM CST TUE DEC 1 2015/ A COLD FRONT WILL CROSS SE TX OVERNIGHT.
859 PM MST TUE DEC 1 2015 MID AND HIGH LEVEL DECK OF CLOUDS SLOW TO MOVE OUT ALONG AND EAST FOR THE FRONT RANGE THIS EVENING AS MOISTURE CONTINUES TO WRAP BACK INTO COLORADO A DEEP UPPER LOW SPIRALING OVER THE NRN GREAT PLAINS THIS EVENING. AS THE LOW MOVES EAST. THERE IS A BATCH OF MIDDLE AND HIGH CLOUDS MOVING SOUTHWARD ACROSS MUCH OF THE CWA ON THE BACK SIDE OF THE UPPER LOW THAT IS CENTERED OVER THE UPPER MISSISSIPPI VALLEY. WEDNESDAY'S HIGHS ARE UP FROM THIS AFTERNOON'S 4-6 C WARMER.
UPPER AIR MAPS TODAY SHOW A LARGE LONGWAVE TROF POSITIONED OVER THE CENTRAL US WITH A STEADY STREAM OF MOISTURE/ABUNDANT CLOUD COVER EXTENDING ALL THE WAY FROM THE EASTERN PACIFIC TO EAST OF THE MISSISSIPPI RIVER VALLEY. EXTENDING OUT FROM THIS LOW PRESSURE SYSTEM. WITH THE PASSAGE OF ENERGY IN THE HIGH LEVEL SOUTHWEST FLOW. TONIGHT'S LOWS LOOK TO BE COOLEST (INTO THE LOWER/MID 50S) ALONG AND NORTHWEST OF A LINE FROM CAMDEN ALABAMA TO WIGGINS MISSISSIPPI. THE HIGHER PROBABILITY OF RAIN SETS UP TO THE SOUTHEAST OF I-65.
AND THE POTENTIAL FOR DRIZZLE CHANGING TO FREEZING DRIZZLE TONIGHT AND WEDNESDAY MORNING. UPPER LOW CONTINUES TO ROTATE SLOWLY EWD ALONG THE MN/IA BORDER THIS AFTERNOON. AND TRIGGER A FEW LIGHT SNOW SHOWERS AND/OR PATCHY LIGHT FREEZING DRIZZLE. THERE IS THE POTENTIAL FOR PATCHY FREEZING DRIZZLE ACROSS THE REGION TONIGHT AND WED MORNING. BUT KEEP THE LOW LEVEL MOISTURE IN PLACE. AND EVENTUALLY PATCHY FREEZING DRIZZLE LATER TONIGHT AND WEDNESDAY MORNING AS NEAR-SFC TEMPERATURES COOL INTO THE UPPER 20S AND LOWER 30S. WHICH WILL INHIBIT THE POTENTIAL IMPACTS FROM THE FREEZING DRIZZLE. HIGH PRESSURE WILL MOVE OVER THE CENTRAL PLAINS ON WEDNESDAY NIGHT.
515 PM CST TUE DEC 1 2015 /00Z TAFS/ A thick cirrus canopy will gradually shift to the south and east tonight as the upper-level trough axis swings across the area.
819 PM CST TUE DEC 1 2015 HIGH PRESSURE CONTINUES TO BUILD INTO THE AREA. AS A LOW PRESSURE TROUGH MOVES THROUGH THE REGION.
LOW TEMPERATURES TONIGHT WILL DROP INTO THE LOW TO MID 30S. TO THE LOWER TO MID 40S ACROSS NORTHWEST OHIO. SCATTERED STRATOCU WILL LAST INTO THE EVENING BEFORE UPPER LEVEL CLOUDS ADVECT INTO THE AREA AS THE LARGE CENTRAL CONUS CYCLONE SHIFTS EASTWARD. SECONDARY WAVE WILL WRAP AROUND THE UPPER LOW LATE TONIGHT AND BRING A CHANCE FOR RAIN AND SNOW BY EARLY WEDNESDAY. ADVECTION OF COOLER AIR WILL CHANGE ALL PRECIPITATION OVER TO SNOW.
951 PM EST TUE DEC 1 2015 LOW PRESSURE OVER MINNESOTA WILL SLOWLY WEAKEN AS IT MOVES EASTWARD INTO THE CENTRAL GREAT LAKES BY WEDNESDAY MORNING. ON WEDNESDAY A TROUGH OF LOW PRESSURE WILL SLIDE ACROSS THE AREA.
For tonight, an upper level trough will swing across central Kansas this evening, with clouds and a few sprinkles ending. Overnight lows will be in the low to mid 20s.
VALLEY TEMPS HAVE FINALLY BEGUN TO RISE IN HARNEY COUNTY AND SNOW THERE LATE TONIGHT MAY MIX WITH OR CHANGE TO SLEET AND FREEZING RAIN AS WARMER AIR MOVES IN ABOVE. FREEZING RAIN POSSIBLE KBNO AREA 09Z-18Z.
THIS EVENING, WITH RIDGE AXIS SITUATED JUST TO THE NW OF MIDDLE TENNESSEE. RIDGE WILL SLIDE EAST OF THE MID STATE OVERNIGHT, SETTING UP RETURN FLOW TOMORROW.
This will prevent ideal radiational cooling conditions, but lows are still expected to be rather cool, ranging from the lower 40s across the northwest to near 50 along the coast.
620 PM CDT SUN OCT 18 2015 THE SHORT TERM WILL REMAIN MUCH ABOVE NORMAL ON TEMPERATURES AS A COUPLE SHORT WAVE TROUGHS AND THEIR ASSOCIATED SURFACE COOL FRONTS/TROUGHS MOVE THROUGH THE REGION.
612 PM CDT SUN OCT 18 2015 DRY WEATHER WILL CONTINUE TONIGHT THROUGH MONDAY EVEN WITH AN APPROACHING COLD FRONT.
As the low-level moisture influx continues Monday morning into the early afternoon, should have stratocumulus development a little farther north and east into our area. A large upper level trough will keep our area in southwest flow aloft the next 24 hours, resulting in some scattered high level clouds from time to time. It will be cool again tonight, with overnight lows in the lower to middle 50s. On Monday, a lee trough will develop by afternoon. Temperatures will be pleasant, with afternoon highs generally in the lower 80s. They all show an upper-level low situated over southern California Monday night, and track the low towards West Central Texas. Yesterday, the GFS was showing this low dampening out somewhat into an upper trough, while the ECMWF maintained a closed circulation as it crossed the state.
1008 PM EDT SUN OCT 18 2015 HIGH PRESSURE CRESTS SOUTH OF THE REGION TONIGHT. THE HIGH MOVES OFFSHORE ON MONDAY.
WILL START OFF WITH A TROUGH-RIDGE- TROUGH UPPER LEVEL PATTERN ACROSS THE CONUS THIS EVENING. THE UPPER LONGWAVE TROUGH OVER THE NORTHEASTERN CONUS AND THE WESTERN ATLANTIC WILL CONTINUE TO MOVE EASTWARD WHILE A MEDIUM AMPLIFIED UPPER LEVEL RIDGE ACROSS THE NATIONS MIDSECTION EXPANDS EASTWARD TO FILL THE VOID OF THE DEPARTING TROUGH. THE UPPER RIDGE WILL EVOLVE INTO A MORE FLATTENED BROAD UPPER RIDGE EXPANDING FROM THE ROCKIES TO THE EAST COAST BY LATE MONDAY AFTERNOON. FALLING INTO THE LOWER TO MID 50S. REACHING THE LOWER 70S.
EXPECT SOME VARIABILITY AGAIN OVERNIGHT WITH TEMPERATURES AS THE LOW LEVEL INVERSION REMAINS QUITE SHALLOW. THIS WILL MAKE THE WEST SLIGHTLY WARMER THAN THE EAST.
THIS EVENING THROUGH MONDAY NIGHT UPPER RIDGING REMAINS ACROSS THE CNTRL CONUS WITH THE MAIN AXIS NOW CROSSING THE UPPER MIDWEST. LARGE UPPER LOW IS CENTERED ACROSS THE NRN CAL INTO THE GREAT BASIN. SURFACE ANALYSIS SHOWS TROUGH/WEAK COLD FRONT CROSSING NE WY JUST EAT OF KGCC. AHEAD OF THE TROUGH. UPPER FLOW WILL BECOMING MORE SWRLY MONDAY AS THE UPPER LOW/LONGWAVE TROUGH APPROACHES FROM THE WEST.
The low level pressure gradient will increase on Monday with the high covering the eastern half of the nation and lee side cyclogenesis occurring over the Rockies. Weak ridging over the nations mid section to transition during the week to southwest flow as a southern stream closed low digs across the desert southwest.
CANADIAN HIGH PRESSURE WILL BUILD INTO THE REGION FROM THE NORTHWEST TONIGHT. WHILE HEIGHTS CONTINUE TO RISE ALOFT AS THE TROUGH PULLS OUT FURTHER OVER THE ATLANTIC. NEAR 60 TO THE LOWER 60S. TEMPS WILL ONCE AGAIN FLIRT WITH THE FREEZING MARK ESPECIALLY IN THE OUTLYING AREAS DESPITE THE SLOWLY MODIFYING AIR MASS. LIKELY A COUPLE OF DEGREES WARMER THAN THE MON MORNING LOWS. WITH ANOTHER RISK OF FROST OR FREEZE CONDITIONS IN THE TYPICALLY COOLER SPOTS.
COLD FRONT CURRENTLY LOCATED FROM SOUTH OF HARLOWTON TO NEAR BILLINGS TO BROADUS. WE ACTUALLY SEE A SHORT WAVE RIDGE BUILD OVER OUR WEST TONIGHT AHEAD OF MAIN UPPER TROUGH TRACKING OUT OF NEVADA. BY TOMORROW MORNING THE MAIN VORTICITY LOBE ASSOCIATED WITH THE TROUGH WILL LIFT ACROSS OUR FORECAST AREA.
806 PM EDT SUN OCT 18 2015 BUT FLATTENS QUICKLY OVERNIGHT THROUGH TOMORROW AND WEAK UPPER RIDGING BEGINS BUILDING INTO THE REGION BY THE END OF THE SHORT TERM FORECAST PERIOD.
A LARGE HIGH PRESSURE SYSTEM WILL SETTLE OVER THE EASTERN U.
THE UPPER TROF OVER CALIFORNIA WILL MAKE JUST A SLIGHT EASTWARD PROGRESSION TONIGHT WITH WEAK ASCENT OVER MOUNTAINS AND WESTERN COLORADO. THIS WILL JUSTIFY KEEPING THE LOW POPS IN THE FORECAST. SO CURRENT FORECAST OF ONLY SLIGHTLY COOLER HIGHS MONDAY LOOKS FINE. THE UPPER TROUGH WILL BE OVER SRN CA WITH A WEAK SWLY FLOW ALOFT OVER COLORADO.
THE UPPER RIDGE OVER THE PLAINS WILL BEGIN TO FLATTEN OUT A BIT TONIGHT. THERE SHOULD STILL BE A FAIR AMOUNT OF MIXING OVERNIGHT AND THE THERMAL RIDGE WILL BE OVERHEAD SO KEPT TEMPS IN THE 40S. A FEW DEGREES COOLER THAN TODAY IN MOST AREAS. EASTERLY WINDS WILL BRING SLIGHTLY COOLER OVERNIGHT LOWS FOR MONDAY NIGHT ALTHOUGH CLOUDS WILL KEEP TEMPS MOSTLY IN THE UPPER 30S AND 40S.
1054 PM EDT SUN OCT 18 2015 COOL HIGH PRESSURE WILL EXTEND ACROSS THE REGION FROM THE NORTH THROUGH THE EARLY PART OF THE WEEK. WITH A WEAK LOW PRESSURE TROUGH FORMING JUST OFFSHORE BY MID WEEK.
956 PM EDT SUN OCT 18 2015 THE NEAR TERM SECTION HAS BEEN UPDATED BELOW UPPER RIDGING WILL MOVE EAST OVER THE AREA FOR THE NEXT SEVERAL DAYS PROVIDING DRY CONDITIONS FOR CENTRAL INDIANA.
727 PM EDT SUN OCT 18 2015 COLD CANADIAN HIGH PRESSURE GIVES WIDESPREAD FREEZE FOR DAWN MONDAY.
821 PM EDT SUN OCT 18 2015 MARINE SOUTHWEST WINDS WILL DEVELOP TONIGHT IN ADVANCE OF THE NEXT COLD FRONT LATER IN THE WEEK.
TEMPERATURES ARE RUNNING ABOUT A DEGREE OR TWO COOLER THAN THEY WERE 24 HOURS AGO MAINLY NEAR THE TENNESSEE RIVER. TEMPERATURES ARE AT OR SLIGHTLY WARMER. FREEZING TEMPERATURES STILL LOOK TO BE A GOOD BET ALONG THE TENNESSEE RIVER. ANOTHER COLD NIGHT IS IN STORE WITH SUBFREEZING TEMPERATURES LIKELY ALONG THE TENNESSEE RIVER.
1209 AM EDT MON OCT 19 2015 AVIATION SOUTHWEST WINDS WILL DEVELOP TONIGHT IN ADVANCE OF THE NEXT COLD FRONT LATER IN THE WEEK.
614 PM CDT SUN OCT 18 2015 STRONG SOUTHERLY LOW LEVEL FLOW WILL CONTINUE TO USHER IN WARMER TEMPERATURES EARLY ON IN THE PERIOD. GUSTY WINDS WILL FINALLY DIMINISH LATE MONDAY AS THE UPPER RIDGE OVER THE REGION FLATTENS OUT.
THE FRESHENING BREEZES AND DRIER AIR ARE THE RESULT OF AN EASTWARD MOVING ANTICYCLONE ACROSS THE SOUTHERN PLAINS. HIGH PRESSURE OVER THE OHIO RIVER VALLEY WILL MOVE SOUTHEASTWARD OVERNIGHT.
HIGH PRESSURE CONTINUES TO SHIFT TO THE EAST THROUGH THE GREAT LAKES THIS AFTERNOON AS A DRY AIR MASS DOMINATES THE REGION AND KEEPS SKIES SUNNY ACROSS MUCH OF THE NORTHLAND. WINDS WILL SHIFT TO THE SOUTH/SW TONIGHT AND REMAIN AROUND 5 TO 10 MPH AHEAD OF THE NEXT TROUGH OF LOW PRESSURE EXPECTED TO MOVE IN FROM THE NW. AVERAGE HIGHS THIS TIME OF THE YEAR ARE TYPICALLY IN THE LOWER 50S. HIGH PRESSURE WILL REMAIN FIRMLY IN CONTROL ON MONDAY NIGHT.
HIGH PRESSURE WILL BRING A WARMING TREND WITH ABOVE NORMAL TEMPERATURES EXPECTED BY MIDWEEK. EXPECT TEMPERATURES TO ONCE AGAIN FALL BELOW FREEZING ACROSS MOST OF THE REGION.
THE STRONGEST WINDS HAVE BEEN ACCOMPANIED BY DEW POINTS RISING INTO THE LOWER AND MID 30S WITH HIGHS IN THE UPPER 60S. AND HELP SUPPRESS UPPER RIDGE OVER MN/WI SOMEWHAT. WITH THE FRONT CATCHING UP TO THE TROUGH OVER MN.
PREVIOUS BAKER BUT FLATTENS QUICKLY OVERNIGHT THROUGH TOMORROW AND WEAK UPPER RIDGING BEGINS BUILDING INTO THE REGION BY THE END OF THE SHORT TERM FORECAST PERIOD.
557 PM MDT SUN OCT 18 2015 THE UPPER RIDGE AXIS THAT WAS OVER THE ROCKY MOUNTAIN REGION YESTERDAY HAS SHIFTED EAST INTO THE GREAT PLAINS. A CLOSED LOW OVER NORTHERN CALIFORNIA AND TROUGH AXIS INTO BAJA WAS DRIFTING SLOWLY EAST TOWARD THE GREAT BASIN. THE SURFACE GRADIENT BETWEEN A PLAINS LEESIDE TROUGH AND RIDGE TO THE WEST WAS GENERATING GUSTY WEST TO SOUTHWEST WINDS ACROSS MUCH OF THE COWBOY STATE.
Temps will be warmer than last night thanks to southerly flow, but clear skies and long nights should still yield 40s for most locations. This will cause the low level pressure gradient to increase allowing winds to turn out of of the south at 5 to 10 mph which will allow for more mixing tonight.
ADDED AREAS OF FROST WORDING TO LOCATIONS THAT WILL DIP TO NEAR FREEZING TOWARDS DAWN. THIS EVENING, WITH RIDGE AXIS SITUATED JUST TO THE NW OF MIDDLE TENNESSEE. RIDGE WILL SLIDE EAST OF THE MID STATE OVERNIGHT, SETTING UP RETURN FLOW TOMORROW.
708 PM EDT SUN OCT 18 2015 HIGH PRESSURE WILL REMAIN IN CONTROL THROUGH THE END OF THE WEEK. BELOW NORMAL TEMPERATURES WILL MODERATE FOR THE LATTER HALF OF THE WORKWEEK AS AN UPPER-LEVEL RIDGE BUILDS OVER THE AREA. HIGH PRESSURE CENTERED OVER THE MISSISSIPPI VALLEY WILL BUILD EAST INTO THE APPALACHIANS OVERNIGHT HOLDING CLEAR SKIES ACROSS THE REGION. RIDGE AXIS WILL SHIFT INTO THE UPSTATE/PIEDMONT TONIGHT. DE-COUPLING MORE LIKELY NEAR RIDGE AXIS SO FROST ADVISORY HAS BEEN POSTED ACROSS THE NORTH MIDLANDS AND PIEDMONT WITH AREAS OF FROST. DRY HIGH PRESSURE AIR MASS CONTINUES ACROSS THE REGION WITH A MAINLY CLEAR SKY. TEMPERATURES MONDAY MAY BE SLIGHTLY WARMER DUE TO AIR MASS MODIFICATION.
A LLJ WILL DEVELOP TONIGHT SO EXPECT WARMER MORNING LOWS TOMORROW, ESPECIALLY ACROSS NW OK. IT STILL APPEARS THE LOWEST RH TOMORROW AFTERNOON WILL NOT COINCIDE WITH THE STRONGEST WINDS SO WILL NOT ISSUE ANY FIRE WEATHER HEADLINES FOR THE MOMENT. BEFORE LOW LEVEL MOISTURE RETURN INCREASES WED-FRI AHEAD OF AN APPROACHING UPPER CLOSED LOW MOVING OVER THE SW CONUS. THIS SYSTEM WILL BEGIN TO RESULT IN LOW CHC POPS BEGINNING WED, WITH HIGHER CHCS SLOWLY SPREADING EAST WITH THE LOW THU-SAT.
614 PM CDT SUN OCT 18 2015 1033 mb high pressure over the lower Ohio river valley will drift east to the mid Atlantic states by Monday morning while upper level ridge over the Great Plains shifts east toward the MS river valley. SSE return flow on back side of high pressure keeping it from getting as cold as past two nights when we had freezing temperatures. A pronounced surface pressure gradient will set up Monday between the departing high pressure system which will be along the east coast and a developing surface pressure trough/frontal boundary from the central Plains to the upper Midwest.
THE CLOSED LOW CENTERED NEAR THE LAKE TAHOE AREA THIS EVENING CONTINUES ITS SLOW EASTWARD PROGRESSION THIS EVENING. AHEAD OF THIS LOW. EXPECT PRECIPITATION TO CONTINUE TOMORROW AS THE LOW OPENS UP AND EJECTS IN PIECES ACROSS NORTHERN UTAH.