Aikyam-Lab/Synoptic-Bench huggingface dataset:
935 AM MST THU FEB 12 2015 A HIGH PRESSURE SYSTEM WILL SLOWLY BUILD OVER THE REGION THROUGH THE WEEKEND.
RADAR RETURNS ARE HOLDING STRONG AND THE BASE OF THE UPPER TROUGH IS JUST NOW MOVING OFF TO THE EAST. /ISSUED 954 AM CST THU FEB 12 2015/ THE COLD FRONT THAT PASSED THROUGH THE REGION IS NOW WELL TO OUR SOUTHEAST WITH MUCH COLDER AIR AND GUSTY WINDS IN ITS WAKE. A THICK LOW LEVEL CLOUD DECK IS MOVING IN FROM THE NORTH THAT IS ASSOCIATED WITH THE UPPER TROUGH PASSAGE.
ISSUED BY NATIONAL WEATHER SERVICE MARQUETTE MI 239 PM CST THU FEB 12 2015 WATER VAPOR LOOP AND RUC ANALYSIS REVEALS AMPLIFIED PATTERN FEATURING WEST COAST RIDGE AND BROAD UPSTREAM TROF ACROSS MUCH OF NORTH AMERICA.
5 INCH BY DAYBREAK WITH THE HIGHER AMTS OVER THE HIGHER ELEVATIONS. THE MAIN ARCTIC COLD FRONT WILL PUSH NW TO SE THRU CENTRAL PA THROUGH THIS EVE. THE 7-MEMBER HIGH RES SPC SSEO HITS THE LAUREL RIDGE ALONG SOMERSET/FAYETTE COUNTY BORDER WITH 2-4" MEAN 24HR ACCUM BY FRIDAY MORNING. ALSO ADDED WIND CHILL ADVISORY FOR THE ALLEGHENIES INTO THE CENTRAL RIDGES WITH WIND CHILLS DROPPING TO -15 TO -20 BELOW. HIGH PRESSURE RIDGE WILL BUILD INTO THE REGION FRIDAY.
LATEST UPPER AIR ANALYSIS INDICATES THE UPPER TROUGH OVER THE GREAT LAKES AND THE RIDGE OVER THE WEST COAST HAVE CHANGED LITTLE. SATELLITE IMAGERY INDICATES MOISTURE ADVECTION OVER THE PACIFIC NORTHWEST MOVING AROUND THE RIDGE WHICH WILL EVENTUALLY MOVER OVER THE PLAINS. AT THE SURFACE A BACKDOOR COLD FRONT WAS MOVING INTO THE AREA. LOW CLOUDS WERE MOVING IN BEHIND THE COLD FRONT. THIS MORNING THE COLD FRONT WILL MOVE TO THE KS/CO BORDER THEN TURN INTO A WARM FRONT AND PUSH BACK EAST ACROSS THE REST OF THE AREA. WEST OF THE FRONT TEMPERATURES WILL BE MUCH WARMER THAN YESTERDAY AND SOUTH WINDS WILL BE BREEZY WITH GUSTS UP TO 30 MPH. WITH A WARMER AIR MASS IN PLACE LOWS WILL BE WARMER THAN LAST NIGHT.
1148 AM CST THU FEB 12 2015 WITH SECONDARY COLD FRONT WELL SOUTH OF THE CWA. THE COLDEST DAY WILL BE TODAY WITH THE HIGH OVER THE STATE HIGHS IN THE SINGLE DIGITS AND TEENS. THE LOW MOVES ACROSS THE AREA FRIDAY AND WE WILL SEE THE WARMEST DAY FOR A WHILE TOMORROW. DURING THE LATE AFTERNOON AND EVENING A STRONG COLD FRONT WILL PUSH ACROSS THE AREA.
BUT THE MAIN PUSH OF COOLER DRIER AIR ASSOC W/ THE NEXT COLD FRONT IS JUST NOW PUSHING INTO THE FL PANHANDLE. THE FRONT WILL PUSH ACROSS THE REGION FROM LATE AFTN THROUGH THE EVENING BRINGING INCREASE IN NW WINDS W/ SCAS FOR PORTION OF THE WATERS AND COOLER/DRIER CONDITIONS.
THE DISCONTINUITY IS DUE TO THE INITIAL FORCING BEING SPENT TRYING TO SATURATE THE DRY LOW LEVELS LEFT OVER FROM THE DEPARTING HIGH PRESSURE SYSTEM. WINDS WILL SWITCH TO THE SOUTH OVERNIGHT AS THE HIGH DEPARTS. THERE IS STILL NO SIGN OF SIGNIFICANT PATTERN CHANGE THROUGH THE PERIOD WITH MEAN TROUGH INTO THE CENTRAL OR ERN CONUS. BUT A SHORT WAVE/PV ANOMALY PASSAGE MUCH LIKE YESTERDAY WILL DRIVE ANOTHER COLD FRONT AND SUBSEQUENT SURGE OF ARCTIC AIR THROUGH THE STATE INTO THE NIGHT. OTHERWISE THE REMAINDER OF THE FORECAST LOOKS DRY WITH PERSISTENT BELOW NORMAL TEMPERATURES WITH JET STAYING AWAY FROM IA IN HEART OF TROUGH THROUGH AT LEAST THU.
THE ARCTIC AIRMASS SHOULD STILL ALLOW FOR LOW WIND CHILL VALUES ACROSS FAR A COLD AND DRY AIRMASS PUSHING INTO THE STATE TODAY BEHIND A COLD FRONT IS RESULTING IN CHILLY AND VERY WINDY CONDITIONS. THE COMBINATION OF THE WINDS AND THE COLD TEMPERATURES ARE RESULTING IN WIND CHILLS IN THE TEENS AND SINGLE DIGITS ACROSS THE HIGHER ELEVATIONS OF NORTH GEORGIA THIS AFTERNOON.
UPPER LEVEL RIDGE OVER THE WESTERN U. ALLOWING WARMER AIR TO SPREAD ACROSS THE EASTERN MOUNTAINS AND PLAINS DURING THE DAY. LEE TROUGH PUSHES EASTWARD TOWARD THE KS BORDER. WITH USUAL LEE SLOPES STAYING AT OR SLIGHTLY ABOVE FREEZING THROUGH THE NIGHT.
FOLLOWED BY A LEE-SIDE TROUGH THAT IS CURRENTLY GIVING THE AREA THE SOUTHERLY FLOW. WITH THE TROUGH SHIFTING OUT INTO THE CENTRAL PLAINS. HAVE GONE WITH THE WARMER GFS GUIDANCE AS A RESULT. THIS WILL GIVE THE CWA OVERNIGHT LOWS RANGING FROM THE MID 20S TO THE LOWER 30S. WITH 925MB TEMPS REACHING +12C TO NEAR +16C DUE TO STRONG H5 RIDGE OVER THE WESTERN PORTION OF THE COUNTRY. WILL GIVE THE FORECAST AREA DAYTIME HIGHS WELL INTO THE LOWER AND MID 60S.
THE AREA OF CONVECTIVE SNOW HAS ENDED AND THE MAIN ARCTIC COLD FRONT WILL PUSH NW TO SE THRU CENTRAL PA THROUGH THIS EVE. HIGH PRESSURE RIDGE WILL BUILD INTO THE REGION FRIDAY.
HIGH PRESSURE OVER THE MID MISSOURI RIVER VALLEY EARLY THIS AFTERNOON WILL CONTINUE SLIDE OFF TO THE EAST TONIGHT.
An upper-level ridge of high pressure will keep dry conditions across the area through Friday, however mid- and high-level clouds will persist.
STRATOCU DECK IS BREAKING UP AS IT MOVES SOUTH AND EAST WITH THE UPPER LOW.
ISSUED BY NATIONAL WEATHER SERVICE MARQUETTE MI 346 PM CST THU FEB 12 2015 WATER VAPOR LOOP AND RUC ANALYSIS REVEALS AMPLIFIED PATTERN FEATURING WEST COAST RIDGE AND BROAD UPSTREAM TROF ACROSS MUCH OF NORTH AMERICA.
NORTHWEST WINDS WILL WEAKEN AS HIGH PRESSURE PUSHES INTO THE REGION AND MOVES OVERHEAD TONIGHT. NORTHWEST WINDS WILL WEAKEN THROUGH THE DAY AND BECOME LIGHT OVERNIGHT AS HIGH PRESSURE MOVES OVERHEAD. PRESSURE GRADIENT GRADUALLY WEAKENING AS HIGH PRESSURE IN THE NORTHERN PLAINS EDGES CLOSER TO LAKE MICHIGAN. HENCE DOWNGRADED GALE WARNING TO SMALL CRAFT ADVISORY BUT LEFT HEAVY FREEZING SPRAY WARNING RUNNING UNTIL 18Z. STRONG SUBSIDENCE VIA COLD ADVECTION AND DAVA IN THE WAKE OF THE UPPER TROUGH WILL MAINTAIN MO CLEAR TO PTLY CLOUDY SKIES TODAY. THE RIDGE AXIS OF THE ARCTIC HIGH WILL SHIFT EWD ACROSS THE STATE WITH LGT SWLY WINDS DEVELOPING LATE ALONG WITH AN INCREASE IN MID TO HIGH CLOUDS VIA WARM ADVECTION.
353 PM CST THU FEB 12 2015 HIGH PRESSURE RIDGE AXIS WILL PASS OVER THE MN ARROWHEAD AND NRN WIS ZONES THIS EVENING BEFORE EXITING TO THE EAST AND ALLOWING WINDS TURN OUT OF THE SOUTH AHEAD OF THE NEXT CLIPPER. AN AREA OF LIGHT SNOW/FLURRIES HAS DEVELOP AHEAD OF THE SFC COLD FRONT CURRENTLY IN PLACE OVER THE CENTRAL DAKOTAS. THE H85 TROUGH/SFC FRONT AND ASSOCIATED SNOW WILL TRANSLATE EAST ACROSS WESTERN MN THIS EVENING. AND PORTIONS OF US HIGHWAY 2 EAST IN THE HIGH TERRAIN EAST OF ASHLAND.
WITH MOST REMAINING AOB THE FREEZING MARK. BUT THIS NWLY WIND IS EXPECTED TO RELAX THIS EVENING AS A HIGH PRESSURE AXIS MOVES INTO THE REGION.
WE EXPECT DRY AND COOL WEATHER TONIGHT WITH LOWS GENERALLY IN THE LOWER 30S HILL COUNTRY TO MID 40S ALONG THE RIO GRANDE. PRECIPITATION IS NOT EXPECTED TONIGHT AS THE UPPER LOW CURRENTLY OVER THE INTERIOR OF NORTHWEST MEXICO WILL RETROGRADE INTO THE CENTRAL GULF OF CALIFORNIA.
ISSUED BY NATIONAL WEATHER SERVICE MARQUETTE MI 221 PM CST THU FEB 12 2015 WATER VAPOR LOOP AND RUC ANALYSIS REVEALS AMPLIFIED PATTERN FEATURING WEST COAST RIDGE AND BROAD UPSTREAM TROF ACROSS MUCH OF NORTH AMERICA.
957 AM PST Thu Feb 12 2015 High pressure over the western U. High pressure remains in control, continuing benign weather. CEO High pressure ridge over the west coast will keep conditions dry through the coming weekend. Warm airmass under the ridge will keep daytime highs well above normal and on the order of 5 to 15 degrees above normal for mid February. ridge on Friday. The high pressure ridge re-amplifies just off the west coast over the weekend bringing dry conditions and mainly fair skies with daytime highs warming slightly. Models indicate continued high cloudiness spilling over the ridge through the weekend so not expecting extensive fog at this time.
RISING HEIGHTS ALOFT ON THE EASTERN PERIPHERY OF THE WESTERN CONUS UPPER RIDGE WILL SUPPORT HIGHS IN THE 60S AREA WIDE.
UPSLOPE-DRIVEN SNOW WILL CONTINUE ALONG THE RIDGES INTO THE EVENING.
336 PM CST THU FEB 12 2015 NO REAL ISSUES WITH THE SHORT-TERM PART OF THE FCST WITH SE TX RE- MAINING UNDER THE INFLUENCE OF THE PERSISTENT UPPER RIDGING TO THE WEST. 41 HIGH PRESSURE WILL SETTLE OVER THE MID MISS VALLEY TONIGHT WITH NORTHEAST WINDS DECREASING.
LIGHT DOWNSLOPE FLOW AND A FEW CLOUDS WILL KEEP TEMPERATURES WARMER OVERNIGHT ESPECIALLY ALONG THE FRONT RANGE. HIGH TEMPERATURES WILL REACH THE LOWER TO MID 60S OVER THE PLAINS.
COLD FRONT HAS PUSHED SOUTH OF THE CWA WITH LOW LEVEL CLOUD DECK RAPIDLY CLEARING IN ITS WAKE.
RIDGE AXIS MOVES EAST BY FRI WITH DOWNSLOPE FLOW. TIMING OF COLD FRONT ON SAT REMAINS A CHALLENGE. HIGHS ON TUE COULD BE SEVERAL DEGREES COOLER THAN CURRENTLY FORECAST. POLAR RIDGE OF HIGH PRESSURE WILL SLIDE TO THE EAST-SOUTHEAST OF THE AREA TODAY. ANOTHER COLD FRONT IS EXPECTED TO DROP SOUTHEAST ACROSS THE AREA EARLY ON FRI.
1245 PM EST THU FEB 12 2015 A STRONG BUT DRY COLD FRONT WILL MOVE THROUGH THE FORECAST AREA TODAY. HIGH PRESSURE BEHIND THE FRONT WILL BE OVER THE FORECAST AREA FRIDAY.
Persistent ridging up to Pacific coast into Alaska and downstream troffing over at least the eastern half of North America will help ensure this fact.
254 PM MST THU FEB 12 2015 AFTERNOON GOES WATER VAPOR IMAGERY SHOWED A HIGH AMPLITUDE UPPER RIDGE FROM THE CENTRAL CA COAST THROUGH THE GREAT BASIN INTO BRITISH COLUMBIA. SURGES OF MID/UPPER LEVEL PACIFIC MOISTURE CONTINUE TO TOP THE RIDGE AND SPREAD SOUTHEAST ACROSS THE REGION. A WARM FRONT EXTENDED NORTH-SOUTH ACROSS THE HIGH PLAINS. 12Z SHORT RANGE MODELS ARE IN GOOD AGREEMENT PROGGING THE SLOW EASTWARD PROGRESSION OF THE WESTERN CONUS UPPER RIDGE THROUGH FRIDAY NIGHT.
WINDS WILL SHIFT FROM THE NORTH TOMORROW MORNING AS A LEE SIDE TROUGH MOVES THROUGH THE PANHANDLES. /ISSUED 415 AM CST THU FEB 12 2015/ STRONG UPPER LEVEL RIDGE REMAINS OVER THE WESTERN U. TEMPERATURES TODAY WILL REACH THE LOW TO MID 50S.
AN UPPER RIDGE WAS BUILDING OVER THE GREAT BASIN AND WILL BECOME THE DOMINANT WEATHER FEATURE. A LARGE TROUGH NEAR 150W AND WELL OFF THE PACIFIC NORTHWEST COAST WAS PUMPING MOISTURE INTO AND OVER THE WESTERN RIDGE. THE RIDGE THAT HAS CAUSED THE UNSEASONABLY WARM WEATHER FOR THE LAST FEW DAYS FINALLY BEGINS TO BREAK DOWN FRIDAY NIGHT AS THE JET STREAM SHIFTS TO THE NORTHERN PLAINS.
ARCTIC HIGH PRESSURE OVER THE UPPER MIDWEST WILL SETTLE FURTHER INTO THE OHIO VALLEY. MOSTLY CLEAR SKIES THIS EVENING WILL LEAD TO MOSTLY CLOUDY SKIES AFTER MIDNIGHT AS WARMER MID LEVEL AIR AND MOISTURE SPILLS DOWN THE BACKSIDE OF THE ROCKIES UPPER RIDGE.
WARM FRONT AND UPPER RIDGING ARE FIRMLY IN CONTROL OVER NORTHEAST MONTANA. BUT SOME POTENTIAL WILL EXIST FOR VERY LIGHT RAIN OR EVEN FREEZING RAIN ACROSS PETROLEUM COUNTY. AS WELL AS WESTERN GARFIELD AND SOUTHERN PHILLIPS COUNTIES LATE TONIGHT AS SOME LIMITED MOISTURE RIDES DOWN THE RIDGE. ALTHOUGH A COLD FRONT WILL BEGIN TO PUSH THROUGH BY LATE AFTERNOON.
321 PM EST THU FEB 12 2015 HIGH PRESSURE OVER THE CENTRAL PLAINS WILL MOVE ACROSS THE OHIO VALLEY FRIDAY.
427 PM EST THU FEB 12 2015 HIGH PRESSURE WILL SETTLE INTO THE REGION TONIGHT INTO TOMORROW.
upper low responsible for the snow in the Davis Mtns continues to retrograde SW. Upper low continues to retrograde to Central Baja California through the beginning of the weekend as it is trapped under a ridge.
TEMPS WILL BE WARMER TODAY WITH AFTN READINGS IN THE 55 TO 60 DEGREE RANGE ACROSS NERN CO EXCEPT POSSIBLY OVER THE FAR NERN CORNER WHERE READINGS STAY IN THE LOWER 50S. A BROAD UPPER LEVEL RIDGE OVER THE WESTERN U.
AND HAVE GONE ON THE LOWER SIDE OF GUIDANCE FOR TONIGHT GIVEN EXPECTED LACK OF CLOUD COVER /WARMER ALONG THE RIO GRANDE WHERE CLOUD COVER SHOULD BE A LITTLE GREATER/.
SHALLOW PATCHY FOG IN THE LOWER TREASURE VALLEY /WEST OF CALDWELL/ AND MTN VALLEYS OF SW IDAHO WILL BURN OFF BY LATE MORNING. THE UPPER RIDGE WILL DOMINATE. LATE NIGHT-EARLY MORNING PATCHY FOG SHOULD BE LIMITED TO THE LOWER TREASURE VALLEY AND THE LONG VALLEY /INCLUDING MCCALL/. HIGH CLOUDS SPILLING OVER THE TOP OF THE RIDGE WILL CONTINUE TO STREAM THROUGH THE AREA.
837 AM PST THU FEB 12 2015 A weak warm front will cross the area today bringing light rain or sprinkles to portions of the Inland Northwest.
WITH A LONGWAVE RIDGE OVER THE WESTERN STATES AND A TROUGH ACROSS THE EAST. A CUTOFF UPPER LOW OVER NW MX WILL CONTINUE TO SINK SOUTHWESTWARD AND AWAY FROM THE REGION. THE CLOUD SHIELD ASSOCIATED WITH THIS LOW CURRENTLY EXTENDS INTO SE NM AND THE WRN PERMIAN BASIN. WILL COME IN BEHIND THE TROUGH FRIDAY AFTERNOON. LOW TEMPS WILL BE A BIT WARMER TONIGHT. MAINLY IN THE LOWER TO MIDDLE 30S.
High pressure near Omaha early this afternoon will slide to the southeast, arriving in the Louisville area by sunrise Friday. As the high proceeds to the central Appalachians tomorrow winds will turn to the southwest and temperatures should rise to around the freezing mark. Lows Friday night will be in the lower and middle 20s.
TONIGHT THROUGH FRIDAY WV IMAGERY STILL SHOWING RIDGE WRN CONUS. TROF ERN CONUS W/ WY UNDER NW FLOW AND INFLUENCES OF A MODEST DIRTY RIDGE AND ONLY MID TO UPR LVL CLOUD. SFC HAS LEE SIDE TROF EXTENDING FROM ERN MT DOWN THRU ERN WY AND ACROSS ERN CO. WITH RELATIVE HIGH P LYING BOTH TO THE E AND W OF THE TROF. AND EVEN THAT WILL LARGELY GO AWAY BY FRIDAY AS RIDGE TRASLATES EWD.
1210 PM MST THU FEB 12 2015 TEMPERATURES RUNNING A BIT COOLER THAN 24 HOURS AGO AT NOON WITH THE GLARING SPOTS IN THE UINTA AND GUNNISON BASINS. AN UPPER RIDGE WAS BUILDING OVER THE GREAT BASIN AND WILL BECOME THE DOMINANT WEATHER FEATURE. A LARGE TROUGH NEAR 150W AND WELL OFF THE PACIFIC NORTHWEST COAST WAS PUMPING MOISTURE INTO AND OVER THE WESTERN RIDGE. THE RIDGE THAT HAS CAUSED THE UNSEASONABLY WARM WEATHER FOR THE LAST FEW DAYS FINALLY BEGINS TO BREAK DOWN FRIDAY NIGHT AS THE JET STREAM SHIFTS TO THE NORTHERN PLAINS.
A COLD FRONT IS EXPECTED TO SWING THROUGH THE AREA FRIDAY.
A WEAK WARM FRONT WILL BRING A LITTLE RAIN TO THE AREA TODAY. A COLD FRONT WILL BRING ANOTHER ROUND OF RAIN FRIDAY AFTERNOON AND EVENING.
MID AND HIGH LEVEL CLOUDS CONTINUE TO TOP OVER AN UPPER RIDGE AND ACROSS THE REGION. THE HIGHER SUN ANGLE THIS TIME OF YEAR SHOULD ALLOW FOR THE FOG TO BURN OFF DURING THE DAY.
BUT WITH DRY AIR IN THE LOW AND MIDLEVELS NOTHING HAS REACHED THE GROUND AS OF YET. WITH THE HIGHER AMOUNTS THROUGH EAST CENTRAL SD INTO SOUTHWEST MN AND THE IOWA GREAT LAKES AREA. TOPPING OUT IN THE LOWER 30S NORTHEAST TO MID 40S THROUGH SOUTH CENTRAL SOUTH DAKOTA.
153 PM MST THU FEB 12 2015 A HIGH PRESSURE SYSTEM WILL SLOWLY BUILD OVER THE REGION THROUGH THE WEEKEND.
This is a pretty cold air mass and despite the sunshine today temperatures were only ranging from the low 20s near VIH to the low 30s in the southwest corner of the state. Very large amplitude pattern was in place over the CONUS with strong ridging over the western U. and deep trough in the east. Temperatures will again be cold tonight and should have the lowest readings in the eastern Ozarks which will see the lightest surface winds the longest. Highs Friday should reach the low 40s east to low 50s west.
1108 AM CST THU FEB 12 2015 SFC ANALYSIS THIS MORNING SHOWS A STRONG RIDGE OF HIGH PRESSURE ACROSS THE CENTRAL AND SOUTHERN PLAINS. WITH THIS RIDGE BEING UPSTREAM OF OUR REGION.
SLIGHTLY WARMER IN THE PANHANDLE AND COOLER IN NORTH CENTRAL NEBRASKA. THE BEST SIGNAL FOR LOW CLOUDS OCCURS MAINLY NEAR THE PINE RIDGE IN SHERIDAN COUNTY AND THE NORTHWEST PARTS OF CHERRY COUNTY. MOST PRECIP WILL LIKELY EVAPORATE AND MOISTEN THE LOW LEVELS AND THUS LIMITED POPS TO LTE14 AND OPTED FOR SPRINKLES AND FLURRIES INSTEAD OF SHOWERS. LOOKING TO BE MUCH MILDER THAN TODAY AS THE 500HPA RIDGE SLOWLY WORKS EAST ACROSS THE FORECAST AREA ALONG WITH CONTINUED WARM AIR ADVECTION AT 850HPA. MAX TEMPS RANGE FROM THE LOWER 60S IN SOUTHWEST NEBRASKA /15 TO 20 DEGREES ABOVE CLIMO/ TO THE UPPER 40S NORTH CENTRAL.
LIGHT/MODERATE CAA CONTINUING ACROSS THE CWA WITH THE COLD FRONT WELL OFFSHORE THIS MORNING. /ISSUED 408 AM CST THU FEB 12 2015/ THE COLD FRONT CONTINUES TO MARCH SOUTH THIS MORNING. AREAS OF DENSE FOG HAVE DEVELOPED AHEAD OF THE COLD FRONT THIS MORNING ALONG THE UPPER TEXAS COAST BUT VISIBILITIES WILL BEGIN IMPROVING AS INCREASING WINDS AND DRIER AIR HELP MIX OUT THE FOG. WITH TEMPERATURES IN THE MID 30S TO UPPER 30S NORTH OF INTERSTATE 10 AND IN THE LOW TO MID 40S SOUTH.
TEMPS OVERNIGHT WILL STALL OR EVEN RISE A FEW DEGREES AS WINDS BECOME MORE SOUTH BRINGING IN WARMER CONDS. HIGHS FRIDAY WILL LIKELY REACH NEAR FREEZING IN WC MN AND EAST OF THE BUFFALO RIDGE IN SW MN.
1032 AM MST THU FEB 12 2015 UPPER LEVEL RIDGE OVER THE WESTERN U. ALLOWING WARMER AIR TO SPREAD ACROSS THE EASTERN MOUNTAINS AND PLAINS DURING THE DAY. LEE TROUGH PUSHES EASTWARD TOWARD THE KS BORDER. WITH USUAL LEE SLOPES STAYING AT OR SLIGHTLY ABOVE FREEZING THROUGH THE NIGHT.
939 AM PST THU FEB 12 2015 A weak warm front will cross the area today bringing light rain or sprinkles to portions of the Inland Northwest.
THESE WINDS SHOULD DIMINISH AND VEER TO AN EAST AND SOUTHEAST DIRECTION AFTER 22Z AS THE RIDGE MOVES EAST OF THE AREA.
A very weak weather feature is traversing over the high pressure ridge this afternoon, producing mainly thick cloud cover and perhaps a few light showers across far northwest Montana.
TODAY THROUGH FRIDAY NIGHT STRONG UPPER RIDGE PERSISTS OVER THE WESTERN CONUS. WEAK UPPER-LEVEL ENERGY MOVING THROUGH THE RIDGE. HELPING PUSH COLD AIR EASTWARD AND ALLOW WARMER AIR TO RETURN TO THE AREA. WESTERLY BOUNDARY-LAYER WINDS WILL CONTINUE TO ADVECT IN WARMER AIR. BACK-DOOR COLD FRONT THEN SLIDES SOUTHWESTWARD INTO THE CWA FRIDAY NIGHT. REMAINING IN THE LOWER 30S ACROSS NORTHEAST WY.
COULD SEE ANOTHER ROUND OF IFR/LIFR CONDITIONS AGAIN TONIGHT INTO WEDNESDAY MORNING AHEAD OF THE NEXT COLD FRONT.
AN AREA OF LIGHT FREEZING RAIN/LIGHT SNOW WAS LOCATED NEAR THE LOW. THEN DEVELOPING LIGHT SNOW ARE THE HIGHLIGHTS OF THE SHORT TERM PERIOD. AND AREA OF FREEZING RAIN.
TODAY THROUGH WEDNESDAY NIGHT CURRENT SURFACE MAP SHOWS ELONGATED AREA OF LOW PRESSURE ACROSS THE EASTERN DAKOTAS.
NRN STREAM SHORT WAVE CARVES OUT A SHARP TROUGH AXIS OVER NE UTAH WEDNESDAY AFTERNOON.
A COLD FRONT WILL CONTINUE TO SLOWLY PUSH SOUTH OF THE SRN TX PNHDL THIS MORNING. SOME OF THE HIGH RES MODELS INDICATE THIS RAIN MOVING INTO THE EASTERN OKLAHOMA PANHANDLE AS WELL. ALTHOUGH DRY AIR AT THE LOW-LEVELS SHOULD PREVENT THIS FROM REACHING THE GROUND. MEANWHILE A COLD FRONT CONTINUES TO SLIDE SOUTH ACROSS THE TEXAS PANHANDLE EARLY THIS MORNING.
A S/W TROF OVER SW WI/NE IA/NW IL AND SOME MID-LEVEL (800-700 MB) FRONTOGENETIC FORCING WAS PRODUCING BANDED SNOWFALL AND ACCUMS OF 1-2 INCHES OVER C/EC WI EARLY THIS MORNING. WV IMAGERY AND RUC ANALYSES SHOWED AN UPPER LOW OVER NORTH DAKOTA. AS THE NORTH DAKOTA UPPER LOW TRACKS TOWARD SW WI. WITH THE HIGHEST ACCUMS IN OUR FAR SW COUNTIES. THEN GRADUALLY DECREASE AS THE UPPER LOW TRACKS SE OF THE REGION IN THE AFTERNOON.
A weak cold front will cross the region this morning with little to no fanfare due to lack of moisture. Beyond that high pressure at the surface and flow aloft becoming nearly zonal will keep the region dry through the remainder of the short term period. During the latter half of the week, a trough will eventually be passing through the region, but the bulk of the moisture and precipitation associated with it, should remain to our south.
NOT SEEING A STRONG PUSH OF COOLER AIR THIS FAR SOUTH THROUGH TONIGHT. BUT SHOULD BE COOLER THAN THIS MORNING WITH LOWS ON THE MILDER SIDE. WITH COOLER AIR IN PLACE AND WEAK COOL ADVECTION THROUGHOUT THE DAY. SHOULD SEE SLIGHTLY HIGHER SNOWFALL RATIOS WITH THE COOLER AIR IN PLACE. THE UPPER TROUGH AXIS WILL CONTINUE TO SWING ACROSS THE AREA WEDNESDAY EVENING.
1257 PM CST TUE JAN 20 2015 STILL HAVE GOTTEN A FEW ADDITIONAL REPORTS OF PATCHY FREEZING DRIZZLE ALONG WITH THE LIGHT SNOW. HAVE KEPT PATCHY FREEZING DRIZZLE IN THE FORECAST THROUGH MID- AFTERNOON OVER FAR SE ND/WC MN. THE ONLY CHANGE MADE THIS MORNING WAS TO KEEP PATCHY FREEZING DRIZZLE IN THROUGH THIS MORNING OVER SE ND/WC MN. WE HAVE GOTTEN A FEW REPORTS OF LIGHT MIST UNDER THE LOW CLOUD DECK. WINDS CONTINUE TO STAY ON THE LOWER END WITH LOTS OF CLOUDS AROUND. GET A BREAK FROM THE LIGHT SNOW WED NIGHT INTO THU WITH A RIDGE AXIS BRIEFLY POKING UP INTO THE AREA.
TEMPERATURES WILL BE A BIT COOLER WITH HIGHS IN THE 40S WHICH IS STILL ABOVE AVERAGE FOR THIS TIME OF YEAR. SLIGHTLY COOLER TEMPERATURES IN THE 30S ARE EXPECTED ON WEDNESDAY BEHIND A MID LEVEL TROUGH.
MODELS CONTINUE TO GO TOO HIGH WITH THE LOW LEVEL MOISTURE AND THIS WILL PLAY A FACTOR AS THIS DISTURBANCE PUSHES ACROSS THE AREA TONIGHT. SLIGHTLY COOLER AIR WILL SPREAD IN BEHIND THIS SYSTEM ON WEDNESDAY.
314 PM CST TUE JAN 20 2015 CURRENT SURFACE ANALYSIS PLACES LOW SETTLING THROUGH THE UPPER MIDWEST WITH TROUGH EXTENDING UP INTO THE NORTHERN PLAINS. AN UPPER RIDGE WILL GRADUALLY PROPAGATE FROM THE EASTERN PACIFIC.
HOWEVER, EXPECT FOG FORMATION TIME TO BE LATER DUE TO LOWER DEWPOINTS, ESPECIALLY IN THE MEDFORD ROGUE VALLEY AREA, WHERE MORE FROST AND FREEZING TEMPERATURES ARE EXPECTED TO SLOW FOG FORMATION DUE TO DEPOSITION IN ADDITION TO SOUTHEAST WINDS BRINGING DRIER AIR AND MIXING IN LIKELY IN SOUTHEASTERN PORTIONS OF THE VALLEYS. MODERATE NORTH WINDS WILL CONTINUE THROUGH THIS EVENING AND THEN WILL DIMINISH WEDNESDAY AS THE THERMAL TROUGH WEAKENS AND SHIFTS SOUTHWARD.
AN INVERTED TROUGH WILL LINGER BEHIND THIS SYSTEM AND COULD BE ENOUGH TO KEEP SOME FLURRIES OR VERY LIGHT SNOW FALLING ACROSS THE REGION THROUGH THE REST OF WEDNESDAY WITH LITTLE TO NO ADDITIONAL ACCUMULATIONS EXPECTED. SOME WARMER LOW LEVEL AIR WILL MOVE IN FROM THE NORTHERN PLAINS AHEAD OF A WEAK TROUGH/FRONT WHICH WILL BRING SURFACE WINDS AROUND TO THE SOUTHWEST. THE ONLY LIFT SEEMS TO COME IN THE LOW LEVELS PER 20. AS THE COLD FRONT MOVES THROUGH.
LIMITED AREAS OF CLEARING WILL ALLOW FOR HIGHS INTO THE LOWER 40S THIS AFTERNOON WITH AREAS THAT REMAIN UNDER CLOUD COVER STRUGGLING THROUGH THE MIDDLE 30S. TEMPS WILL FALL BELOW FREEZING THIS EVENING AS WE AWAIT THE NEXT CLIPPER. BROAD CLOSED 700 MB LOW WILL TRACK FROM BENTON HARBOR TO SOUTH OF DETROIT KEEPING THE HIGHEST ACCUMULATION POTENTIAL GENERALLY ALONG THIS TRACK.
124 PM MST TUE JAN 20 2015 FAST MOVING LOW PRESSURE WILL MOVE INTO THE REGION EARLY WEDNESDAY.
SURFACE MSLP MAPS ARE SHOWING AN EXPANDING SURFACE ANTICYCLONE OUT OF ONTARIO DOWN ACROSS LAKE HURON/NORTHERN LOWER MICHIGAN INTO AT LEAST THE THUMB REGION. THE LOW LEVELS ARE EXPECTED TO REMAIN SUFFICIENTLY MOIST. FAIRLY QUIET WEATHER RETURNS TO SOUTHEAST MICHIGAN AS HIGH PRESSURE AND RESULTING DRY CONDITIONS RETURNS TO THE REGION.
A BIT WARMER EAST WITH THE CLOUD COVER HANGING AROUND LONGER OVERNIGHT.
303 PM EST TUE JAN 20 2015 AN AREA OF WEAK LOW PRESSURE SYSTEM OVER THE NORTHERN PLAINS THIS EVENING WILL MOVE EAST ACROSS NORTHERN OHIO ON WEDNESDAY. THE LOW WILL MOVE ACROSS PENNSYLVANIA TOMORROW NIGHT.
A WEAK DISTURBANCE BRINGS COOLER TEMPERATURES ALONG WITH CHANCES FOR RAIN AND HIGH ELEVATION SNOW SHOWERS.
A WEAK COLD FRONT WILL PASS THROUGH THE REGION TODAY INTO THE EVENING HOURS. A DRY COLD FRONT WILL MOVE THROUGH THE REGION AND WINDS WILL SHIFT OUT OF THE NORTH THIS AFTERNOON AND EVENING. STRONG HIGH PRESSURE RIDGING WILL GIVE WAY TO A SHORT WAVE AND ASSOCIATED COLD FRONT THAT WILL MOVE INTO THE DELTA THIS MORNING AND PROGRESS ACROSS THE AREA THROUGH THE AFTERNOON INTO THE EVENING HOURS. HIGH PRESSURE RIDGING AND LIGHT NORTHEASTERLY WINDS WILL PREVAIL ACROSS THE AREA ON WEDNESDAY. AFTERNOON HIGHS WILL BE A LITTLE COOLER MAINLY IN THE UPPER 50S TO LOWER 60S.
A COLD FRONT CURRENTLY EXTENDS FROM SOUTHEAST MISSOURI THROUGH NORTHERN ARKANSAS AND INTO CENTRAL OKLAHOMA. THERE WILL BE AN INCREASE IN CLOUDS AS THE FRONT MOVES THROUGH THE REGION WHICH WILL KEEP TEMPERATURES A LITTLE COOLER THAN THE LAST COUPLE OF DAYS WITH HIGHS EXPECTED TO BE IN THE MID 50S TO LOWER 60S. HIGH PRESSURE WILL START TO BUILD INTO THE REGION ON WEDNESDAY. THE AIR BEHIND THE COLD FRONT WILL BE A LITTLE COOLER BUT TEMPERATURES WILL REMAIN ABOVE NORMAL WITH HIGHS MAINLY IN THE 50S.
EVEN THOUGH THE AREA OF PRECIPIATION IS MORE BROKEN THAN THIS MORNING THE LOWER KEYS STILL HAVE A GOOD CHANCE OF RECEIVING SOME PRECIPITATION THIS AFTERNOON.
AN UPPER LEVEL TROUGH OVER CA WILL MOVE EAST ON WEDNESDAY AND APPROACH THE 4 CORNERS REGION WED NIGHT.
312 PM EST TUE JAN 20 2015 HIGH PRESSURE WILL BUILD ACROSS THE REGION TONIGHT THROUGH WEDNESDAY.
400 PM EST TUE JAN 20 2015 A WEAK TROUGH OF LOW PRESSURE IS MOVING ACROSS SOUTH FLORIDA. AS THIS LOW CROSSING THE CWA, ANOTHER LOW WILL FORM OFF THE OUTER BANKS OF NORTH CAROLINA. THIS NEW LOW WILL BRING A WEAK COLD FRONT INTO THE AREA.