Aikyam-Lab/Synoptic-Bench huggingface dataset:
TODAY AND TONIGHT DEEP CYCLONIC FLOW IS OVERSPREADING SOUTHEASTERN MICHIGAN THIS MORNING AS A CLOSED LOW HEIGHT ANOMALY QUICKLY AMPLIFIES OVER MUCH OF EASTERN CANADA. MODEST DEFORMATION AND FGEN FORCING WILL BE POSSIBLE AHEAD OF LOW TO MIDLEVEL TEMPERATURE GRADIENT WITH THE SHALLOW NATURE OF THE HIGH BASED INSTABILITY LIMITING THE OVERALL POTENTIAL. DAYTIME TEMPERATURES WILL RANGE IN THE UPPER 70S OVER MUCH OF THE AREA WITH SOME SNEAKY LOW TO POSSIBLY MID 80 DEGREE READINGS FOR THE HIGHER SURFACE PRESSURE AREAS/HEAT ISLAND SOUTH AND EAST OF THE TERRAIN. VERY LARGE UPPER LEVEL LOW/CIRCULATION ENCOMPASSING CENTRAL/EASTERN CANADA EARLY THIS WEEK.
A LARGE UPPER LEVEL LOW WILL DOMINATE THE WEATHER OVER THE GREAT LAKES REGION TODAY THROUGH TUESDAY. THE LOW CLOUDS WILL PERSIST INTO THE NIGHT. AS THE UPPER LOW MOVES OFF TO THE EAST. AND AN UPPER LEVEL RIDGE APPROACHES FROM THE DAKOTAS.
NORTHWEST FLOW ALOFT REMAINS IN PLACE WITH A WESTERN NORTH AMERICAN RIDGE WELL ESTABLISHED. AS LOW AND MID LEVELS IN THE ATMOSPHERE REMAIN QUITE DRY AND THE NORTHWEST FLOW ALOFT REMAINS INTACT WITH THE RIDGE AXIS STILL TO OUR WEST. THE HIGHER RAIN CHANCES ARRIVE TUESDAY NIGHT AS THE WAVE MOVES ACROSS NORTH DAKOTA.
TEMPERATURES WILL STILL LIKELY BE IN THE LOWER TO MIDDLE 90S ALONG AND SOUTH OF I-70 AHEAD OF THE COLD FRONT WHERE MIXING WILL BE ABOVE 850MB.
748 AM EDT MON AUG 3 2015 WEAK LOW PRESSURE WILL LIFT NORTHEASTWARD ACROSS NORTHERN FLORIDA TODAY THEN ALONG THE COAST TONIGHT INTO TUESDAY. A BROAD UPPER TROUGH EXTENDED ACROSS THE EASTERN PART OF THE COUNTRY. THE DEEPEST MOISTURE IS EXPECTED TO REMAIN TO OUR SOUTH AND EAST BUT LIKELY WILL INCREASE A BIT AS THE LOW LIFTS NORTHWARD. TEMPERATURES SHOULD BE A FEW DEGREES COOLER TODAY GIVEN RELATIVELY CLOUDY START DUE TO STRATUS AND MOSTLY CLOUDY SKIES THROUGH MUCH OF THE DAY.
THE WEAK WARM FRONT WAS STILL LOCATED OFFSHORE. A WARM FRONT WAS LOCATED ACROSS THE NORTH CENTRAL AND NORTHWEST GULF ON 05Z SURFACE ANALYSIS. A FEW ISOLATED SHOWERS HAD ALREADY DEVELOPED IN THE VICINITY OF THE WARM FRONT AS OF 345 AM CDT. THE SLOW NORTHWARD PROGRESSION OF THE WARM FRONT AND MOISTURE AXIS TODAY WILL ALLOW FOR ADDITIONAL SCATTERED SHOWER AND THUNDERSTORM DEVELOPMENT OVER THE COASTAL WATERS AND ALONG THE COAST AS MOISTURE RETURNS TO THE REGION. THE UPPER RIDGE AXIS PRESENTLY TO OUR WEST WILL ALSO BEGIN TO BUILD ON TUESDAY AND SHIFT EAST AS AN UPPER LOW LOCATED OFF THE WEST COAST SWINGS TOWARDS CALIFORNIA.
Temperatures on Monday should be a few degrees cooler with an increase in clouds.
NO UPDATES ANTICIPATED CHATTANOOGA AIRPORT, TN 94 69 96 73 / 0 10 10 10 KNOXVILLE MCGHEE TYSON AIRPORT, TN 92 67 90 70 / 0 10 20 10 OAK RIDGE, TN 92 69 92 68 / 0 10 20 10 TRI CITIES AIRPORT, TN 90 64 87 65 / 0 30 20 20.
1024 AM EDT MON AUG 3 2015 AVIATION SECTION UPDATED A COLD FRONT WILL BRING CHANCES OF RAIN TO PORTIONS OF CENTRAL INDIANA THROUGH TUESDAY. THEN AN AREA OF LOW PRESSURE WILL BRING BETTER CHANCES FOR RAIN MID WEEK.
THE LONGWAVE PATTERN FEATURES RIDGING FROM TEXAS TO WASHINGTON/BRITISH COLUMBIA. OVERALL IDEA IS FOR THE CURRENT RIDGE TO CONTINUE BREAKING DOWN WITH A SERIES OF CLOSED LOWS IN THE NORTHERN PACIFIC MOVING TOWARD THE SHORE.
LOWS OVERNIGHT WILL BE IN THE 50S EVERYWHERE BUT THE MISSOURI VALLEY WHERE CLOUDS WILL KEEP TEMPERATURES IN THE LOWER TO MIDDLE 60S. WITH THE SLIGHTLY COOLER READINGS MOST LIKELY IN OUR SOUTHWEST WHERE CLOUD COVER WILL BE MOST ABUNDANT.
/ISSUED 351 AM CDT MON AUG 3 2015/ THE UPPER LEVEL RIDGE OF HIGH PRESSURE CENTERED OVER THE SOUTHERN PLAINS WILL EXTEND EAST ACROSS THE MID SOUTH TODAY THROUGH TUESDAY.
THERE WILL BE A TENDENCY FOR RISING MID LEVEL HEIGHTS AS WESTERN CONUS RIDGE AMPLIFIES AND GRADUALLY SHIFTS EASTWARD.
THIS WILL LIKELY BE THE CASE FOR THE NEXT COUPLE OF MORNINGS AS AN UPPER RIDGE REMAINS CENTERED TO THE WEST OF NORTH TEXAS. THE UPPER RIDGE WILL EVENTUALLY BUILD BACK OVER THE REGION BY THE END OF THE WEEK.
904 AM EDT MON AUG 3 2015 WAVE OF LOW PRESSURE WILL CONTINUE TO MOVE NORTHEAST OVER THE REGION THIS AFTERNOON. MAINLY CLOUDS AND SHOWERS ARE EXPECTED AS THIS LOW TRACKS OVERHEAD. WAVE OF LOW PRESSURE WILL TRACK NORTHEAST ACROSS SE GA/NE FL THIS AFTERNOON THEN OVER AREA WATERS THIS EVENING.
1203 PM EDT MON AUG 3 2015 SHOWER AND THUNDERSTORM DEVELOPMENT WILL ACCOMPANY A COLD FRONT PASSAGE LATER TODAY. AFTERNOON FOCUS IS ON CONVECTION POTENTIAL IN ADVANCE OF A COLD FRONT SLATED FOR EVENING PASSAGE ACROSS THE UPPER OHIO VALLEY REGION. TUESDAY LOOKS TO BE A DRY DAY WITH BROAD HIGH PRESSURE BUILDING OVER THE UPPER OHIO VALLEY.
1145 AM EDT MON AUG 3 2015 HIGH PRESSURE WILL BE MOVING INTO THE REGION WHICH WILL USHER IN COOLER AND DRIER AIR. LOW TEMPERATURES TONIGHT WILL RANGE FROM THE UPPER 50S IN SOUTHERN MICHIGAN TO THE LOWER 60S NEAR THE OHIO RIVER. POTENT SW TROUGH ROUNDING SRN EXTENSION OF UPR LOW OVR HUDSON BAY QUICKLY ON THE WAY OUT EARLY THIS AM. OTRWS TEMPS MUCH COOLER TDA COMPARED TO YDAS HOT TEMPS AS LL CAA WRAPS SWD ESP THIS AFTN IN TANDEM W/PASSAGE OF SECONDARY CDFNT.
OTHERWISE UPPER LEVEL RIDGING WILL BUILD IN, ENDING RAIN CHANCES. WENT FOR A PRIMARILY PERSISTENT FORECAST, WITH HIGHS IN THE UPPER 90S TO 100 TODAY AND LOWS IN THE LOWER TO MID 70S.
A COLD FRONT WILL BRING CHANCES OF RAIN TO PORTIONS OF CENTRAL INDIANA THROUGH TUESDAY. THEN AN AREA OF LOW PRESSURE WILL BRING BETTER CHANCES FOR RAIN MID WEEK.
CONVECTION ASSOCIATED WITH AXIS OF DEEP MOISTURE FROM WEAK SURFACE TROFFING/CONVERGENCE. AS WELL AS LINGERING MID LEVEL TROFFING/SHEAR AXIS. VFR CONDITIONS TO PREVAIL AS A WEAK RIDGE OF HIGH PRESSURE HOLDS OVER THE AREA. /ISSUED 351 AM CDT MON AUG 3 2015/ WARM FRONT IS CURRENTLY ADVANCING NORTH ACROSS THE FORECAST AREA THIS MORNING AS NOTED BY INCREASING DEW POINTS. UPPER RIDGE IS FORECAST TO BE SUPPRESSED AND PUSH WEST OVER THE NEXT FEW DAYS AS TROUGH DEEPENS IN THE EASTERN U.
733 AM EDT MON AUG 3 2015 PERSISTENT TROUGH ACROSS NORTH FLORIDA WILL RESULT IN LIGHT SSE- SSW SURFACE WIND ACROSS SOUTH FLORIDA WITH CONVECTION DEVELOPING ALONG SEA BREEZE BOUNDARIES AROUND 15-17Z. H7-H5 LAPSE RATES ARE A LITTLE STEEPER, HOWEVER THE FREEZING LEVEL MAY CLIMB ABOVE 15KFT FOR THE FIRST TINE IN A FEW DAYS. INTO TONIGHT AND TUESDAY, THE PANHANDLE LOW MOVES NORTHEAST TO THE GA/SC COAST AS THE RIDGE AXIS POKES DEEPER INTO CENTRAL FLORIDA.
WILL CONTINUE TO SEE MOSTLY SUNNY SKIES AND PLEASANT TEMPERATURES AND HIGH PRESSURE RESIDES OVER THE AREA.
WITH STORM CHANCES CONFINED TO THE HIGHER TERRAIN EAST OF PHOENIX.
WEAK UPPER AND SURFACE RIDGING WILL PREVAIL ACROSS THE AREA TODAY WITH ANOTHER DRY DAY ON TAP. OVERNIGHT LOWS WILL BE WARMER TUESDAY NIGHT ONLY FALLING BACK INTO THE LOW 70S OVER MOST THE AREA.
SHOULD SEE THIS FEATURE RETURN NORTH AS SOUTHERLY SURFACE WINDS TAKE HOLD LATER THIS MORNING INTO THIS AFTERNOON OWING TO PRESSURE FALLS RESULTING FROM LEE TROUGHING EXTENDING FROM THE FRONT RANGE SOUTH ALONG THE TEXAS/NEW MEXICO STATE LINE. THE RIDGE AXIS BY MID TO LATE WEEK WILL BE SITUATED OVER THE REGION WHICH WILL LIMIT MOST CHANCES AT CONVECTION.
AND WEAK MID LEVEL RIDGING MOVES IN FROM THE SOUTHWEST. IN FACT, THERE ARE SOME SIGNALS FROM THE NAM THAT THE COMPLEX WILL LOSE SUPPORT FROM THE LOW LEVEL JET POSSIBLY BECOMING MORE COLD POOL DRIVEN AND WEAKENING IN SOUTHEAST KS.
TUESDAY A S/WV RIDGE BUILDS BRIEFLY ACROSS THE AREA WITH LIMITED CHANCE POPS THROUGH THE DAY.
TEMPERATURES WILL BE COOLER TODAY WITH NORTHERLY FLOW AND DRIER DEW POINTS ACROSS THE REGION. FRONTAL BOUNDARY THAT SUNK THROUGH THE STATE TODAY WILL BEGIN TO LIFT BACK NORTHWARD AS A WARM FRONT SLOWLY LATE TONIGHT INTO TUESDAY.
PATCHY FOG HAS FORMED AT TROY WHERE DEWPOINT TEMPERATURES WERE IN THE LOWER 70S. CENTRAL ALABAMA WILL REMAIN ON THE BOTTOM SIDE OF A BROAD UPPER TROF OVER THE EASTERN UNITED STATES THROUGH TUESDAY. WARMER LOW LEVEL AIR TO THE WEST OF ALABAMA WILL SHIFT EASTWARD THE NEXT FEW DAYS AND HIGHS ON TUESDAY WILL LIKELY BE THE WARMEST VALUES OF THE WEEK.
TO OUR SOUTHEAST IS A COASTAL TROUGH AND PRECIPITABLE WATER VALUES BETWEEN 2. THE UPPER RIDGE REMAINS FLAT AND NOT WELL-DEFINED AS A TROUGH IS CURRENTLY MOVING ONSHORE NEAR CALIFORNIA. THE RIDGE AXIS WILL BEGIN TO STRENGTHEN TO OUR WEST. AND WILL HAVE AN INFLUENCE ON OUR WEATHER AS HIGHS COULD BE A DEGREE OR TWO WARMER THAN TODAY.
VEERED WINDS AHEAD OF THE COLD FRONT ARE ADVECTING DRIER AIR THROUGH THE I-64 CORRIDOR. TUESDAY A S/WV RIDGE BUILDS BRIEFLY ACROSS THE AREA WITH LIMITED CHANCE POPS THROUGH THE DAY.
FROM SATELLITE WE SEE SOME TRAVERSE CLOUD FEATURES ON THE SOUTHEAST SIDE OF THE CIRRUS OUTFLOW FROM THIS LOW. FINALLY THE ATLANTIC AREA OF HIGH PRESSURE IS BUILDING ACROSS THE FLORIDA PENINSULA. LIGHT WINDS THROUGH THE LOWER BOUNDARY LAYER WITH NEARLY 2 INCHES OF PWAT THROUGH THE COLUMN WILL ENHANCE THE OPPORTUNITY FOR DEVELOPING ISLAND CLOUDLINES TODAY. WITH THE TROUGH OVER THE NORTHERN GULF OF MEXICO LIFTING OUT THROUGH TUESDAY NIGHT. EXPECT THE ATLANTIC RIDGE TO STRENGTHEN THE PRESSURE GRADIENT ACROSS THE KEYS AREA.
930 AM CDT MON AUG 3 2015 THE FORECAST FOR TODAY REMAINS ON TRACK WITH WEAK HIGH PRESSURE IN PLACE UNDER HAZY SKIES FROM SMOKE FROM PACIFIC NORTHWEST AND CANADIAN FIRES. NORTHWEST FLOW ALOFT REMAINS IN PLACE WITH A WESTERN NORTH AMERICAN RIDGE WELL ESTABLISHED. AS LOW AND MID LEVELS IN THE ATMOSPHERE REMAIN QUITE DRY AND THE NORTHWEST FLOW ALOFT REMAINS INTACT WITH THE RIDGE AXIS STILL TO OUR WEST. THE HIGHER RAIN CHANCES ARRIVE TUESDAY NIGHT AS THE WAVE MOVES ACROSS NORTH DAKOTA.
A LOW PRESSURE SYSTEM WILL SLOWLY THROUGH NORTHERN UTAH TODAY. A MOIST TROUGH IS PUSHING THROUGH NORTHERN UTAH AND SOUTHWEST WYOMING THIS MORNING. AND IN EXCESS OF ONE INCH ACROSS SOME OF THE HIGHER TERRAIN. A SIGNIFICANTLY DRIER AIRMASS HAS MOVED INTO THE AREA BEHIND THE TROUGH. BUT THERE REMAINS A 20 PERCENT CHANCE THAT WINDS COULD SWITCH BACK TO THE SOUTH BETWEEN 17Z AND 21Z AS THE LOW PRESSURE SYSTEM REMAINS TO THE NORTH.
VFR CONDITIONS TO PREVAIL AS A WEAK RIDGE OF HIGH PRESSURE HOLDS OVER THE AREA. /ISSUED 351 AM CDT MON AUG 3 2015/ WARM FRONT IS CURRENTLY ADVANCING NORTH ACROSS THE FORECAST AREA THIS MORNING AS NOTED BY INCREASING DEW POINTS. UPPER RIDGE IS FORECAST TO BE SUPPRESSED AND PUSH WEST OVER THE NEXT FEW DAYS AS TROUGH DEEPENS IN THE EASTERN U.
MID-LVL TROUGH AXIS WILL REMAIN OVER THE GREAT LAKES REGION. AS COOLER AIR ALOFT BEGINS TO FILTER SOUTH ACROSS THE FORECAST AREA. MOST LOCATIONS SHOULD HAVE AFTN TEMPS WARM INTO THE UPPER 70S TO THE LOW 80S. WEAK LOBE OF VORTICITY PIVOTS AROUND THE TROUGH LATE TONIGHT. AND LIKELY REMAIN IN THE LOW 60S CLOSER TO THE LAKE. 500MB TROUGH AXIS BEGINS TO RELAX TO THE NORTH. HIGHS WILL APPROACH 80 TO THE LOW 80S. BEACHLER 253 AM CDT THE MAIN UPPER LOW.
729 AM EDT MON AUG 3 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW A COLD FRONT WILL BRING CHANCES OF RAIN TO PORTIONS OF CENTRAL INDIANA THROUGH TUESDAY. THEN AN AREA OF LOW PRESSURE WILL BRING BETTER CHANCES FOR RAIN MID WEEK.
949 AM EDT MON AUG 3 2015 SHOWER AND THUNDERSTORM DEVELOPMENT WILL ACCOMPANY A COLD FRONTAL PASSAGE LATER TODAY. FOCUS TODAY WILL BE ON A COLD FRONT THAT WILL SLIDE ACROSS THE REGION THIS AFTERNOON AND EVENING. TUESDAY LOOKS TO BE A DRY DAY WITH BROAD HIGH PRESSURE BUILDING OVER THE UPPER OHIO VALLEY.
UPPER LOW IN UTAH WITH TROUGH EXTENDING WNW-ESE MOVING NE AT THIS TIME. THE TROUGH WILL PASS THROUGH OUR CWA LATER TODAY AND TONIGHT WITH ISOLATED-SCATTERED SHOWERS AND THUNDERSTORMS AND RELATIVELY COOLER AIR. TEMPERATURES WILL COME DOWN TO ABOUT NORMAL TODAY AS THE TROUGH AND ASSOCIATED CLOUDS AND SHOWERS MOVE IN. EXPECTING A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS ON TUESDAY AFTERNOON AS WELL AS AN UPPER LEVEL TROUGH PUSHES MOISTURE AND INSTABILITY THROUGH. MOSTLY ALONG THE NEVADA BORDER AND IN THE HIGHER TERRAIN. THE UPPER LOW CENTER AND ITS UPPER TROUGH WILL MOVE ACROSS SW CANADA AND THE PAC NW THIS WEEK.
WEAK HIGH PRESSURE BUILDING OVER THE SOUTHWEST WILL BRING A SLIGHT WARM UP. THEN A DRY TROUGH OF LOW PRESSURE OFF THE COAST WILL PUSH EAST THROUGH THE AREA LATE IN THE WEEK FOR A COOLING TREND. LITTLE CHANGE IN TEMPS TODAY COMPARED TO YESTERDAY ALTHOUGH THEY MAY BE SLIGHTLY COOLER IN SPOTS DUE TO SOME HIGH LEVEL CLOUDS THAT WILL PUSH ACROSS TODAY IN THE UPPER LEVEL SOUTHWEST FLOW.
BROADSCALE TROFFING WL CONTINUE ACROSS THE REGION INTO TONIGHT WITH AXIS OF UPPER JET OVER SRN WI.
AN UPPER LEVEL RIDGE WAS OVER WESTERN NORTH AMERICA AND AN UPPER TROUGH WAS OVER THE HUDSON BAY/GREAT LAKES AREA. UPPER RIDGE TO MOVE THROUGH THE FORECAST AREA EARLY WED WITH A TROUGH CLOSELY IN TOW WED AFTERNOON AND EVENING. TROUGH NOW EXTENDING FROM UT TO NORTHERN CA WILL MOVE INTO THE NORTHERN PLAINS BY WED. NORTHWEST- SOUTHEAST ORIENTATED UPPER LEVEL JET OVER THE AREA WILL SHIFT EAST OF THE AREA BY EARLY WED AS UPPER TROUGH OVER EASTERN CANADA MOVES EAST.
932 AM EDT MON AUG 3 2015 AREA OF LOW PRESSURE OVER NORTH FLORIDA CREATING A LARGE AREA OF WEST TO SOUTHWEST BOUNDARY LAYER FLOW OFF THE GULF OF MEXICO WITH STRONG COASTAL CONVERGENCE ONGOING ALONG THE WEST COAST OF FLORIDA.
1012 AM EDT MON AUG 3 2015 A COLD FRONT WILL PUSH SOUTHEAST THROUGH THE REGION THIS AFTERNOON INTO THIS EVENING. A RIDGE OF HIGH PRESSURE WILL BUILD BACK INTO THE AREA BEHIND THIS FRONT ON TUESDAY.
1247 PM EDT MON AUG 3 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW A COLD FRONT WILL BRING CHANCES OF RAIN TO PORTIONS OF CENTRAL INDIANA THROUGH TUESDAY. THEN AN AREA OF LOW PRESSURE WILL BRING BETTER CHANCES FOR RAIN MID WEEK.
While a cold front has nosed into northern MO it appears isentropic ascent on the 305K and 310K surfaces is the primary driver, the same mechanism which aided convection over the past 2 days.
CENTRAL ALABAMA REMAINS ON THE DRIER WEST SIDE OF THE MID LEVEL TROUGH AXIS TODAY. DUE TO THE HIGHER DEWPOINTS ACROSS THE SOUTHEAST.
A LEE TROUGH REMAINS ENTRENCHED IN EAST COLORADO. A WEAK COLD FRONT HAS BACKED INTO SOUTHWEST NEBRASKA AND NORTH CENTRAL KANSAS. WEAK FORCING IS STILL EXPECTED TO MOVE ACROSS THE HIGH PLAINS BUT THE TWO MAIN AREAS OF LIFT SHOULD SPLIT AROUND THE FORECAST AREA.
1107 AM EDT MON AUG 3 2015 DRY HIGH PRESSURE WILL REMAIN IN PLACE ACROSS THE AREA TODAY. LOW LEVEL MOISTURE WILL GRADUALLY RETURN THROUGH THE WORK WEEK AS A COLD FRONT APPROACHES FROM THE AREA FROM THE NORTHWEST. A LATE DAY SEABREEZE SHOULD ARRIVE IN THE LOWER PIEDMONT. AN UPPER TROF REMAINS OVER THE ERN CONUS THIS AFTN. WEAK HIGH PRESSURE REMAINS OVER THE AREA AS A LOW PRESSURE CENTER RIDES UP THE EAST COAST ALONG A LEFTOVER FRONTAL BOUNDARY. FINALLY A COLD FRONT WILL DROP SOUTH TOWARD THE AREA LATE TONIGHT. TO THE SOUTH OF AN UPPER LOW OVER JAMES BAY AND A RIDGE OVER THE NORTHERN ROCKIES.
948 AM PDT MON AUG 3 2015 COOLER WEATHER THIS WEEK WITH TEMPERATURES AROUND AVERAGE FOR EARLY AUGUST.
ONE WEAK DISTURBANCE WITHIN THIS FLOW ACROSS THE HIGH PLAINS COULD BRING A FEW SHOWERS AND THUNDERSTORMS TO NORTHEAST NEBRASKA THIS MORNING.
REMAINDER OF THE AREA SHOULD BE DRY AS HIGH PRESSURE ALOFT CONTINUES.
THE FOCUS FOR HEAVY PRECIPITATION MOVES NORTH TODAY AS THE CENTER OF THE CLOSED LOW MOVES TO NORTHERN UTAH. HIGH PRESSURE AND DRIER AIR WILL QUICKLY BUILD IN EARLY TUESDAY AND KEEP ISOLATED AFTERNOON TSTORM DEVELOPMENT MAINLY TO THE MOUNTAIN TERRAIN ON TUESDAY. SUBTROPICAL HIGH PRESSURE WILL BE CENTERED OVER THE SWRN CONUS WITH THE RIDGE AXIS ALONG THE UTAH/COLORADO BORDER.
AT THE SURFACE AND THE THE LOWER TO MIDDLE LEVELS. THE CENTER OF A STALWART EARLY COOL AUTUMNAL ANTICYCLONE IS POSITIONED OVER DOWNEAST MAINE. TEMPERATURES OUTSIDE OF THE SHOWER ACTIVITY ARE IN THE LOWER TO MID 80S WITH DEWPOINTS IN THE MIDDLE TO UPPER 70S. COMBINATION OF THE MID AND UPPER LOW PRESSURE SYSTEM OVER SOUTH TEXAS/WESTERN GULF REMAINING IN PLACE. UPPER RIDGING OVER SOUTH FLORIDA. WITH SURFACE TO MIDDLE LEVEL TROUGHING OVER NORTHWEST CARIBBEAN. SO WILL ADVERTISE MIDDLE OF THE LOW ROAD CHANCES FOR SHOWERS AND THUNDERSTORMS TODAY WITH LOW CHANCE TONIGHT THROUGH MONDAY NIGHT.
346 AM EDT SUN SEP 27 2015 A WEAKENING UPPER LOW WILL TRACK SOUTH OF PENNSYLVANIA EARLY TODAY.
430 AM EDT SUN SEP 27 2015 A LARGE HIGH PRESSURE SYSTEM, WILL MAINTAIN DRY WARM WEATHER, FOR THE REST OF THE WEEKEND.
WV imagery shows an upper ridge extending from Baja NE into the upper Midwest, adjacent to a trough centered over the Texas Gulf Coast. The NAM, and to a lesser extent, GFS, try to bring a vort max around the trough and into the lwr Trans Pecos this afternoon, whereas the ECMWF keeps things dry. Otherwise, the Gulf Coast trough is forecast to lift into the SE CONUS and shear out by midweek, w/the upper ridge building in to West Texas and Southeast New Mexico to keep temps above normal throughout the week, and grids dry.
350 AM CDT SUN SEP 27 2015 A MID/UPPER LEVEL LOW IS NOW IN PLACE ALONG THE TEXAS COAST. WILL CONTINUE TO CARRY LOWER RAIN CHANCES (AND THE WARMER TEMPERATURES) NORTHWEST AREAS AND HIGHER RAIN CHANCES (AND THE COOLER TEMPERATURES) SOUTHEAST AREAS.
559 AM EDT SUN SEP 27 2015 A WEAKENING UPPER LOW WILL TRACK SOUTH OF PENNSYLVANIA EARLY TODAY.
SW flow aloft continues over Norcal as the area remains in between a positively- tilted ridge axis from the Baja into the Nrn Plains States and a positively-tilted trof from the PacNW SWwd along 140W where the forecast closed-low has materialized. The high cloudiness may negatively impact the viewing of the "Super Moon" this evening especially over the Srn portion of the CWA. but max temps will still run a little above normal as the closed low remains west of 130W. the low is forecast to move towards the Pac NW with an increase in synoptic cooling and increasing onshore gradients which will lower max temps to normal/below normal. The track of the low to the N of CA and into ORE keeps the chances of precip from this system N of our CWA through mid week.
327 AM CDT SUN SEP 27 2015 A COLD FRONT EXTENDED FROM HUDSON BAY SOUTHWESTWARD ACROSS SOUTHERN MANITOBA. THE NORTHERLY WINDS WILL USHER IN COOLER AIR BEHIND THE FRONT.
1237 AM MDT SUN SEP 27 2015 UNDER STRONG HIGH PRESSURE MILD TEMPERATURES CONTINUE TONIGHT. DESPITE RIDGING STILL IN PLACE.
405 AM MDT SUN SEP 27 2015 TILTED RIDGE AXIS EXISTS OVER THE FOUR CORNERS TONIGHT AND EXTENDS OVER NE COLORADO.
404 AM MDT SUN SEP 27 2015 THE UPPER LEVEL RIDGE WILL REMAIN OVER THE AREA THRU TONIGHT.
244 AM EDT SUN SEP 27 2015 HIGH PRESSURE WILL REMAIN ACROSS THE GULF OF MAINE OVERNIGHT INTO SUNDAY.
603 AM EDT SUN SEP 27 2015 HIGH PRESSURE OVER NEW ENGLAND WILL SLIDE EAST INTO THE WESTERN ATLANTIC.
303 AM CDT SUN SEP 27 2015 Cloud cover over the Mississippi and Ohio Valleys is associated with a remnant upper low that is gradually dissipating across those areas. Therefore nudged temperatures up a bit over the western CWA where highs should reach the lower 80s similar to yesterday.
OTHERWISE A LARGE AREA OF STRATUS WILL MOVE INTO SRN WI FROM THE SE TODAY AS SRN WI IS ON THE NW PERIPHERY OF A BROAD UPPER LOW AND ASSOCIATED MOISTURE.
SOME CLOUDS TRYING TO MIGRATE THROUGH THE RIDGE OVER AZ AND INTO NW NM THIS AFTERNOON.
348 AM EDT SUN SEP 27 2015 HIGH PRESSURE OVER NEW ENGLAND WILL SLIDE EAST INTO THE WESTERN ATLANTIC.
646 AM EDT SUN SEP 27 2015 HIGH PRESSURE WILL REMAIN ACROSS THE GULF OF MAINE OVERNIGHT INTO SUNDAY.
331 AM CDT SUN SEP 27 2015 (Today and Tonight) An upper low will meander over the middle Texas coast today and tonight, while an upper ridge over the southwestern states remains in place.
Sunday through Monday night: Very dry air is in place with the passage of yesterday's cold front. This will result in sunny skies over the Inland Northwest; however, the clear skies and dry air will also promote strong radiational cooling at night with lows in the lower to mid 30s for many locations; this will also promote frost formations, which will include portions of the basin, Spokane/Coeur d'Alene areas and the Palouse. This will result in slightly warmer temperatures and possibly some very thin cirrus developing across southern WA and into the southern Panhandle.
ARE WITH REMNANTS OF LAST NIGHT/S COLD FRONT. NW WINDS LOOK TO CONTINUE THROUGH EVENING AS THE WAVY COLD FRONT REMAINS OVER NV- UT-SE ID AND HIGH PRESSURE BUILDS ACROSS WA-ID PANHANDLE-SRN CANADA THROUGH TONIGHT. ON MONDAY THE HIGH CENTER EXITS TO THE NRN PLAINS AND THE NV LOW LIFTS NORTH FOR WARMING TO AROUND 10 DEGREES ABOVE NORMAL MONDAY ALONG WITH LIGHT DIURNAL WINDS UP TO 10 MPH.
350 AM CDT SUN SEP 27 2015 WEAKLY CYCLONIC NORTHEAST FLOW IS IN THE PROCESS OF FLATTENING THIS MORNING AS THE FINAL VESTIGES OF YESTERDAY/S SHEARED TROUGH EXIT TO OUR SOUTH.
THESE WINDS ARE USHERING DEEPER LOW/MID LEVEL MOISTURE INTO NRN LOWER MICHIGAN FROM A WEAK UPPER LEVEL LOW PRESSURE OVER THE MID ATLANTIC. RAINFALL WITH THIS LOW PRESSURE IS WELL BACK TO OUR SE OVER THE VIRGINIAS. UPPER TROUGHING AND A COLD FRONT WERE PROGRESSING INTO MONTANA AND THE DAKOTAS. SYNOPTIC PATTERN EVOLUTION AND ASSOCIATED WEATHER: THE HIGH PRESSURE MOVES OFF THE ATLANTIC COAST THROUGH TONIGHT WHILE THE UPSTREAM TROUGHING AND COLD FRONT MOVE INTO WESTERN GREAT LAKES AND MID MISSISSIPPI VALLEY. THE LEADING EDGE OF FORCING FROM THE UPPER TROUGH/FRONT DOES SNEAK INTO THE FAR WESTERN AREAS OF THE CWA BY DAYBREAK. HIGHS LIKELY NOT GETTING OUT OF THE LOWER 70S.
HIGH PRESSURE OVER THE DESERT SOUTHWEST WILL MAINTAIN A VERY WARM AIRMASS ACROSS THE GREAT BASIN THROUGH THE FIRST PART OF THIS WEEK.
1249 AM CDT SUN SEP 27 2015 A seasonably warm afternoon is underway across this region at this hour, with temperatures ranging from the low 80s west to the upper 70s east, where a large cloud deck has started to move west into the forecast area. These clouds are associated with a weakening area of upper level low pressure, which is meandering its way across the lower Ohio Valley. The upper levels will become a bit more zonal over the region Sunday into Monday, with the Ozarks again "sandwiched" between a cooler air mass to our north and a more summer-like, humid air mass to our south. This should result in several more days with highs in the low to mid 80s, with lows around 60.
153 AM EDT SUN SEP 27 2015 A LARGE AREA OF HIGH PRESSURE OVER NEW ENGLAND WILL MOVE EAST OFF THE COAST ON SUNDAY. MEANWHILE WEAK LOW PRESSURE OFF THE CAROLINA COAST WILL REMAIN NEARLY STATIONARY.
HIGH PRESSURE WILL WEAKEN TODAY. THE LARGE AREA OF HIGH PRESSURE THAT PROVIDED FOR MUCH WARMER THAN NORMAL TEMPERATURES OVER THE AREA FOR THE PAST FEW DAYS IS NOW BREAKING DOWN AND SHIFTING EAST. A SOUTHWEST FLOW WILL PREVAIL OVER THE REGION AS AN UPPER LOW CENTER CURRENTLY SITUATED WELL OFF THE SOCAL COAST NEAR 34N/139W AND LIFTS SLOWLY NORTHEAST TOWARD THE PAC NW. BUT THE LOWER AND MID LEVELS REMAIN DRY.
SURGE OF TROPICAL MOISTURE AND ISENTROPIC LIFT NORTH OF THE LOW WILL LEAD TO WIDESPREAD SHOWERS AND EMBEDDED STORMS MAINLY ALONG THE GULF COAST WHICH MAY SPREAD AS FAR EAST AS THE SUWANNEE VALLEY REGION AND THIS AREA WILL HAVE LIKELY POPS WITH SCATTERED MOSTLY AFTERNOON POPS ELSEWHERE.
255 AM CDT SUN SEP 27 2015 THE MAIN WEATHER FEATURE OVER THE SOUTHERN PART OF THE CONUS REMAINS A QUASI-STATIONARY UPPER LOW CURRENTLY CENTERED OVER THE COASTAL REGION OF TEXAS. AN ACCOMPANYING TROUGH APPEARS TO RESIDE OVER THE NORTHWEST GULF OF MEXICO OFF THE COASTS OF TEXAS AND LOUISIANA. THE LATEST SET OF MODEL DATA INDICATES THAT BOTH THE UPPER LOW AND ITS SURFACE COUNTERPART WILL DRAW A DEEP FETCH OF GULF MOISTURE NORTHWARD INTO SOUTHEAST TEXAS AND LOUISIANA.
457 AM CDT SUN SEP 27 2015 A MID/UPPER LEVEL LOW IS FORECAST TO REMAIN CENTERED OVER THE NORTHWEST GULF OF MEXICO NEAR THE CENTRAL TX COAST.
1021 PM PDT SAT SEP 26 2015 Breezy west winds will continue this afternoon behind a passing cold front. Light winds in the more sheltered valleys of NE Washington and N Idaho will allow temperatures to dip below the freezing mark by morning. The higher elevations of the Palouse may see freezing temperatures as well.
A QUASI-STATIONARY UPPER LEVEL LOW WILL REMAIN ACROSS THE AREA TODAY WITH THE AXIS OF THE LOW GENERALLY ALONG THE TX COAST. WRAPPING AROUND THE UPPER LOW THROUGH MONDAY.
351 AM EDT SUN SEP 27 2015 HIGH PRESSURE OVER NEW ENGLAND WILL PROVIDE ANOTHER DRY DAY TODAY WITH INCREASING CLOUD COVER.
408 AM EDT SUN SEP 27 2015 LOW PRESSURE MOVING OVER WEST VIRGINIA WILL PROVIDE CLOUDS AND THE CHANCES FOR SHOWERS INTO MONDAY. WEAK UPPER LOW CONTINUES TO DIG SLOWLY TOWARD THE MID OHIO VALLEY. WHATS LEFT OF THE UPPER LEVEL LOW WILL CONTINUE TO PULL ATLANTIC MOISTURE OVER THE REGION BEFORE EXITING LATE TONIGHT.