Aikyam-Lab/Synoptic-Bench huggingface dataset:
348 PM CDT THU APR 2 2015 A BROAD UPPER TROUGH APPROACHING THE REGION FROM THE WEST WILL PROVIDE STEADILY INCREASING LIFT OVERNIGHT. HOWEVER THE SURFACE COLD FRONT THAT MOVED ACROSS IOWA LAST NIGHT IS WELL TO THE SOUTH ACROSS MISSOURI NOW AND WE RESIDE IN AN AREA OF COOL AND DRY NORTHWEST SURFACE FLOW BEHIND IT. PUMPING IN COOLER AIR DESPITE THE HIGH CLOUDS STREAMING OVERHEAD. SUFFICIENT SATURATION TO SEE SOME LIGHT PRECIPITATION WILL BE ACROSS SOUTHERN IOWA WHERE THE COOLER/DRIER AIR FROM THE NORTH WILL NOT BE AS DEEP. TEMPERATURES WILL BE QUITE COOL COMPARED TO THE PAST FEW DAYS AS COLD ADVECTION WILL BE ONGOING WITH THERMAL TROF DROPPING INTO THE STATE.
High pressure then starts moving in allowing for some more drying of the well-mixed atmosphere and partial clearing. Temps should fall into the lower to mid 20s tonight, but the duration of coldest temps is expected to be only 2-3 hours as some upper atmospheric moisture and clouds move in ahead of another front later.
1225 PM CDT THU APR 2 2015 COLD FRONT WILL MOVE ACROSS IA TODAY AND BE SOUTH OF THE STATE TONIGHT.
A COLD FRONT WILL MOVE ACROSS THE AREA LATE TONIGHT INTO FRIDAY MORNING WITH STRONG NORTHERLY WINDS BEHIND THE FRONT. /ISSUED 303 AM CDT THU APR 2 2015/ INITIAL SFC COLD FRONT ENTERING NORTHWEST OKLAHOMA THIS MORNING WILL STALL SOMEWHERE NEAR OR JUST NORTH OF I-40 AROUND MIDDAY BEFORE LIFTING BACK NORTH LATE TODAY. THIS DISTURBANCE WILL DRIVE A RATHER STRONG COLD FRONT SOUTH THROUGH THE AREA OVERNIGHT TONIGHT INTO FRIDAY MORNING WITH MUCH COOLER/DRIER AIR AND STRONG GUSTY NORTH WINDS. COOLER AND DRIER CONDITIONS WILL LAST A COUPLE OF DAYS.
A BROAD AREA OF HIGH PRESSURE DOMINATES THE WESTERN NORTH ATLANTIC. BUT LOOPS FROM MIMIC TPW HIGHLIGHT ITS DENIGRATION WITHIN THE HIGH'S ANTICYCLONIC ENVELOPE. TEMPERATURES HAVE REACHED THE LOWER 80S AND DEWPOINTS ARE IN THE 60S.
AN UPPER LEVEL TROUGH MOVING EAST ACROSS THE PLAINS INTO THE MIDWEST FORCES A COLD FRONT SOUTH THROUGH SOUTH CENTRAL TEXAS FRIDAY AFTERNOON INTO EARLY EVENING.
324 PM CDT THU APR 2 2015 LOW PRESSURE OVER CENTRAL OKLAHOMA THIS AFTERNOON WAS CREATING A TIGHT PRESSURE GRADIENT. A FEW SHOWERS AND TSTMS ARE POSSIBLE AS SURFACE TEMPS OVER COME THE LOW LEVEL CAP. A COLD FRONT WILL REACH THE NORTHWEST COUNTIES OF THE CWA BY MIDDAY FRIDAY.
LOW CLOUDS WILL LINGER THROUGH LATE MORNING AHEAD OF A COLD FRONT WHICH WILL BRING SHWRS AND TSTMS LATER IN THE DAY ON FRIDAY. /ISSUED 446 AM CDT THU APR 2 2015/ WATER VAPOR IMAGERY THIS MORNING SHOWS A TROUGH OF LOW PRESSURE MOVING ACROSS LOWER MISSISSIPPI VALLEY. WITH THE TROUGH AXIS OVER EASTERN ARKANSAS AND LOUISIANA. AS THIS TROUGH SHIFTS EAST. THE KSHV VAD WIND ARE ALREADY SHOWING SOUTHERLY WINDS RANGING BETWEEN 25 AND 40 KTS IN THE LOWEST 2000 FEET. A COLD FRONT WILL THEN DIG ACROSS THE REGION ON FRIDAY.
A cold front will move south into West Central Texas Friday morning, shifting the winds to the north at the KABI and KSJT terminals. Mild again tonight ahead of an approaching cold front for Friday.
233 PM CDT THU APR 2 2015 SYNOPSIS: CLEARING TAKING PLACE ACROSS THE FORECAST AREA THIS AFTERNOON AS DRIER WORKS IN BEHIND DEPARTING COLD FRONT. BREEZY WEST- NORTHWEST WINDS OF 10-20 MPH WITH GUSTS IN THE 25-30 MPH PRETTY COMMONPLACE WITH TEMPERATURES HOVERING IN THE UPPER 50S TO THE LOWER 60S. WILL BE WATCHING A FAIRLY VIGOROUS MID- LEVEL TROUGH OVER SOUTHERN MANITOBA SWING EAST. CLEARING IS EXPECTED FRIDAY AFTERNOON FROM WEST TO EAST AS THE TROUGH DEPARTS AND RIDGING BUILDS IN FROM THE WEST.
124 PM EDT THU APR 2 2015 RAIN IS EXPECTED TO SPREAD ACROSS THE REGION TODAY AHEAD OF A COLD FRONT. BUT WILL QUICKLY BE REPLACED BY ADDITIONAL CONVECTION ASSOCIATED WITH THE OUTFLOW BOUNDARY/SYNOPTIC COLD FRONT MOVING OUT OF THE UPPER MIDWEST. WINDS WILL DIE DOWN SIGNIFICANTLY BY THE EVENING HOURS ONCE THE COLD FRONT SLIDES THROUGH THE AREA.
A STRONGER COLD FRONT WILL MOVE ACROSS THE REGION EARLY FRIDAY MORNING. THE SHOWERS AND THUNDERSTORMS WILL END FRIDAY MORNING AS COOLER AND DRIER AIR MOVES INTO THE AREA.
A cold front will spread through southeast New Mexico and southwest Texas Friday morning with winds shifting to the north and increasing behind a cold front at HOB around 12Z and remaining terminals by 16Z.
600 PM CDT THU APR 2 2015 THE COLD FRONT IS NOW THROUGH THE FORECAST AREA. FORECAST CHALLENGE FOR REMAINDER OF TODAY WILL BE TRACKING A COLD FRONT FROM GRAND FORKS THROUGH THE REST OF THE CWA. TEMPS CONTINUE TO FALL BEHIND COLD FRONT AND PRECIP SHOULD BE OUT OF AREA BY 03Z.
DEWPOINTS HAVE REBOUNDED SINCE YESTERDAY AS A WARM FRONT HAS LIFTED NORTH OF THE FORECAST AREA.
FIRE WEATHER CONCERNS HIGHLIGHT THE SHORT TERM FORECAST FOR TODAY ACROSS SOUTHWEST AND SOUTH CENTRAL NORTH DAKOTA AS A COLD FRONT PROPAGATES FROM NORTHWEST TO SOUTHEAST ACROSS THE STATE.
303 PM CDT Thu Apr 2 2015 19z/2pm surface map shows cold front extending from near Danville to just north of St. Light rain will develop along/north of the low, but most of this precip will hold off until Friday morning. 850mb moisture axis and thermal ridge pointed northward along MS river into southern IL this morning. Cold front on surface data and SFC mesoscale analysis data has reached central IL.
THEN LIGHTER WESTERLY WINDS EXPECTED BEFORE A STRONG COLD FRONT PUSHES INTO THE PANHANDLE TONIGHT/FRIDAY MORNING. THE COLD FRONT SHOULD REACH KGUY BY AROUND 06Z. /ISSUED 454 AM CDT THU APR 2 2015/ SFC COLD FRONT WHICH PUSHED THRU THE FCST AREA AS OF THIS WRITING WILL RETREAT NWD TODAY.
1254 PM CDT THU APR 2 2015 SKIES BREAKING OUT INTO VFR BY MID AFTERNOON WITH MVFR CIGS RETURNING TONIGHT AHEAD OF A COLD FRONT BRINGING A NORTHERLY WINDSHIFT AND SOME THUNDERSTORM CHANCES LATE TOMORROW. A COLD FRONT WILL MOVE ACROSS THE AREA FRIDAY AFTERNOON. /ISSUED 1232 PM CDT THU APR 2 2015/ STRONG HEATING IS OCCURRING IN LLANO COUNTY AND VICINITY WITH TEMPERATURES ALREADY IN THE LOWER 80S. UPPER AIR ANALYSIS LAST EVENING SHOWED A SHALLOW TROUGH OVER EASTERN TEXAS AND ZONAL FLOW FARTHER WEST. THE UPPER PATTERN WILL BE ZONAL THROUGH THIS PERIOD WITH A BROAD RIDGE BULGING UP FROM MEXICO AND A BROAD TROUGH MOVING THROUGH THE CENTRAL PLAINS. FRIDAY A COLD FRONT WILL DROP DOWN FROM THE NORTH MOVING THROUGH OUR CWA DURING THE AFTERNOON.
WATER VAPOR SATELLITE IMAGERY IS SHOWING AN UPPER LEVEL TROUGH MOVING ACROSS NEVADA AT THIS TIME. IN ADDITION TO THE TROUGH. EXPECT ENOUGH COLD AIR BEHIND THE NORTHERLY SURGE FOR PRECIPITATION TO CHANGE ALL TO SNOW WITH TEMPERATURES HOVERING AROUND FREEZING. SO WILL HAVE TO THE HIGHEST POPS THIS AFTERNOON FOR THIS AREA. MID LEVEL MOISTURE WILL DEGRADE THROUGH THE DAY WITH COOLER AIR STICKING AROUND KEEPING HIGHS ON FRIDAY IN THE 40S.
332 PM CDT THU APR 2 2015 FIRE WX CONCERNS TO DIMINISH WITH WIND SPEEDS EARLY THIS EVENING WITH FOCUS THEN SHIFTING TO A STRONG COLD FRONT PROGGED TO ENTER THE FCST AREA ABT 09Z FRIDAY AND EXIT THE AREA BY 15Z. MODEL PERFORMANCE THRU THE WINTER AND EARLY SPRING HAS TYPICALLY FAVORED THE WARMER NUMBERS. WILL SPLIT THE MIDDLE AND THEN LEAN WARMER WHICH MEANS BUMPING FCST HIGHS BY 2 TO 3 DEGREES AREA WIDE.
ALTHOUGH POPS WILL BEGIN TO INCREASE IN THE 06Z TO 12Z PERIOD FROM THE NW AS THE ASSOCIATED COLD FRONT SAGS SOUTHEAST. THE COLD FRONT WILL CONTINUE TO EASE SE INTO AND THROUGH THE FORECAST AREA.
BY LATE FRIDAY MORNING A COLD FRONT WILL BE POISED ACROSS ARKANSAS AND WILL MOVE INTO THE DELTA BY LATE AFTERNOON. THE COLD FRONT WILL MOVE INTO THE DELTA BY THE LATE AFTERNOON HOURS AND MOVE SOUTHEAST ACROSS THE AREA.
BUT AGAIN THE LOW LEVELS ARE QUITE DRY SO WILL KEEP POPS NO HIGHER THAN ISOLD LATE TONIGHT THROUGH MIDDAY FRIDAY.
214 PM CDT THU APR 2 2015 A COLD FRONT WILL ROLL THROUGH THE PANHANDLES LATE TONIGHT AND EARLY FRIDAY MORNING. THEN THE HIGHS MAY NEED TO BE BUMPED UP.
LIGHTER WINDS AND COOLER CONDITIONS ARE FORECAST FOR FRIDAY.
555 PM CDT THU APR 2 2015 SYNOPSIS: CLEARING TAKING PLACE ACROSS THE FORECAST AREA THIS AFTERNOON AS DRIER WORKS IN BEHIND DEPARTING COLD FRONT. BREEZY WEST- NORTHWEST WINDS OF 10-20 MPH WITH GUSTS IN THE 25-30 MPH PRETTY COMMONPLACE WITH TEMPERATURES HOVERING IN THE UPPER 50S TO THE LOWER 60S. WILL BE WATCHING A FAIRLY VIGOROUS MID- LEVEL TROUGH OVER SOUTHERN MANITOBA SWING EAST. CLEARING IS EXPECTED FRIDAY AFTERNOON FROM WEST TO EAST AS THE TROUGH DEPARTS AND RIDGING BUILDS IN FROM THE WEST.
1120 AM MDT THU APR 2 2015 UPPER FLOW WILL BE WESTERLY TODAY AHEAD OF A TROUGH THAT WILL MOVE INTO THE PLAINS TONIGHT. THE TROUGH WILL SHIFT EAST ACROSS THE PLAINS FRIDAY.
THIS SYSTEM WILL PRODUCE STRONG FRONTOGENESIS AS A SECONDARY COLD FRONT SINKS INTO THE CENTRAL PLAINS AROUND AND AFTER MIDNIGHT. NORTH WINDS INCREASE TO 25 TO 35 MPH WITH THE COLD FRONT. CLOUDS WILL BE DECREASING FAIRLY RAPIDLY AS WELL AS STRONG SUBSIDENCE MOVES IN BEHIND THE TROUGH. THIS WILL BRING COOLER TEMPERATURES TO WESTERN KANSAS WITH HIGHS EXPECTED TO BE IN THE MID 50S TO LOWER 60S WHICH IS AROUND OR A LITTLE BELOW NORMAL FOR THIS TIME OF YEAR.
339 PM CDT THU APR 2 2015 FORECAST CHALLENGE FOR REMAINDER OF TODAY WILL BE TRACKING A COLD FRONT FROM GRAND FORKS THROUGH THE REST OF THE CWA. TEMPS CONTINUE TO FALL BEHIND COLD FRONT AND PRECIP SHOULD BE OUT OF AREA BY 03Z.
AS THE COLD FRONT SAGS FURTHER SE INTO THE REGION.
A COUPLE OF WEAK SHORT WAVES TROFS ARE CURRENTLY TRACKING EASTWARD ACROSS THE MID MISSISSIPPI VALLEY REGION.
830 PM EST FRI FEB 20 2015 NERLY BREEZE ACRS CENTRAL FL WILL VEER TO THE E OVERNIGHT AS THE CONTINENTAL POLAR RIDGE CENTERED OVER THE ERN SEABOARD/WRN ATLC PUSHES SEAWARD. HI PRES RIDGE CENTERED OVER THE MID ATLC COAST THIS EVNG WILL PUSH INTO THE W ATLC OVERNIGHT.
ABUNDANT MOISTURE HAS STREAMED INTO THE LOWER LVLS ON GUSTY SELY WINDS TODAY. WARMING SOUTHERLIES HAVE NOW BECOME REESTABLISHED BETWEEN COOL HIGH PRESSURE EAST OF THE REGION. AND DEEPENING LOW PRESSURE OVER THE TEXAS PANHANDLE.
654 PM EST FRI FEB 20 2015 LOW PRESSURE DEVELOPING IN THE MISSISSIPPI VALLEY WILL TAKE A TRACK TO THE NORTH OF PENNSYLVANIA THIS WEEKEND.
702 PM EST FRI FEB 20 2015 HIGH PRESSURE WILL MOVE OFF THE CAROLINA COAST TONIGHT. A WEAK WARM FRONT WILL DEVELOP AND REMAIN NEAR THE FORECAST AREA THROUGH SATURDAY.
WITH DEW POINTS IN THE LOWER 50S. AND GULF WATERS WEST OF THE SEVEN MILE BRIDGE. WINDS WILL TREND MORE NORTHEAST TO EAST OVERNIGHT AS THE HIGH CELL CONTINUES TO MIGRATE EAST NORTHEASTWARDS OFF OF THE COAST. THE LOW TEMPERATURE IN KEY WEST WAS 52 DEGREES UNTIL IT WAS BROKEN EARLY THIS MORNING WHEN THE TEMPERATURE FELL TO 49 DEGREES AT THE KEY WEST INTERNATIONAL AIRPORT.
ANB THIS EVENING AS SCATTERED SHOWERS PRODUCE A MIX OF LIGHT FREEZING RAIN AND SLEET. A FREEZING RAIN SLEET MIX WILL REMAIN POSSIBLE OVERNIGHT AT ASN AND ANB. THE SURFACE FREEZING LINE WAS GENERALLY FROM AUBURN TO BIRMINGHAM TO VERNON. THE FREEZING WET BULB IS MUCH FARTHER SOUTH FROM NEAR TROY TO NEAR ALICEVILLE. WHILE THE ADVISORY AREAS WILL RECEIVE SLOWLY CLIMBING TEMPERATURES TO JUST ABOVE FREEZING FAR NORTHEAST BY SUNRISE. MAINLY SLEET AND FREEZING RAIN WHILE EAST OF I-65 COULD SEE SNOW. SLEET AND FREEZING RAIN THOUGH 9 TO MIDNIGHT. AREAS EAST OF I-65 WILL SLOWLY TRANSITION TO A MIX OF RAIN SLEET AND FREEZING RAIN.
A COLD FRONT WILL PUSH THRU THE AREA THIS EVENING. COLD FRONT WILL MAKE ITS MOVE INTO THE FORECAST AREA THIS EVENING.
AN APPROACHING TROUGH WILL BRING BREEZY CONDITIONS TO THE REGION THIS WEEKEND WITH GUSTY EASTERLY WINDS OVER HIGHER ELEVATIONS. THIS WEEKEND, THE UPPER RIDGE WILL AMPLIFY AND SLIDE FARTHER OFF THE COAST AS AN UPPER TROUGH SHIFTS SOUTHWARD OVER NORTHERN CALIFORNIA. OFFSHORE FLOW WILL DEVELOP AS THE TROUGH CONTINUES SOUTHWARD.
STILL LOOKING AT A SWITCH OVER FROM THE CURRENT SNOWFALL AND A BIT OF SLEET MIX TO FREEZING RAIN OVER THE NEXT FEW HOURS FOR KBNA AND KCKV.
624 PM EST FRI FEB 20 2015 HIGH PRESSURE OVER THE MID ATLANTIC REGION THIS EVENING WILL MOVE EAST. LOW PRESSURE OVER THE SOUTHERN PLAINS WILL MOVE THROUGH THE OHIO VALLEY ON SATURDAY AND SPREAD SNOW ACROSS THE REGION.
WINDS ARE VERY LIGHT ACROSS THE NATURE COAST AND TEMPERATURES HAVE ALREADY FALLEN INTO THE LOWER 40S AND UPPER 30S IN SPOTS. A MAJOR WARM-UP WILL OCCUR ACROSS THE AREA TOMORROW AS HIGH PRESSURE MOVES INTO THE WESTERN ATLANTIC ESTABLISHING A WARMING SOUTHEASTERLY FLOW ACROSS THE AREA. HIGH PRESSURE SLIDES OFF THE EASTERN SEABOARD TONIGHT AND CONTINUES EAST THROUGH THE WEEKEND.
WIDELY SCATTERED AREAS OF LIGHT FREEZING RAIN CONTINUE. PRIMARILY IN THE ARKANSAS RIVER VALLEY AND IN THE LOWER TERRAIN AREAS OF CARROLL COUNTY. NO SIGNIFICANT REPORTS OF ICING AT THIS TIME AND HOPEFULLY TEMPERATURES WILL RISE ABOVE FREEZING OVER THE NEXT FEW HOURS.
558 PM EST FRI FEB 20 2015 HIGH PRESSURE WILL MOVE OFF THE CAROLINA COAST TONIGHT. A WEAK WARM FRONT WILL DEVELOP AND REMAIN NEAR THE FORECAST AREA THROUGH SATURDAY.
WARMING SOUTHERLIES HAVE NOW BECOME REESTABLISHED BETWEEN COOL HIGH PRESSURE EAST OF THE REGION. AND DEEPENING LOW PRESSURE OVER THE TEXAS PANHANDLE.
BANDS OF PRECIP /MAINLY IN THE FORM OF FREEZING RAIN/ ARE MOVING WEST TO EAST ACROSS THE AREA AS STRONG LLVL WAA/ISENTROPIC FORCING INTERACTS WITH SHALLOW/ARCTIC COLD AIRMASS. 03Z/9PM TEMPS ACROSS NRN AL/SRN TN REMAIN BELOW FREEZING. SUPPORTING THE FREEZING RAIN (AT TIMES MIXED WITH SLEET). SFC TEMPS WILL GRADUALLY WARM ABOVE FREEZING FROM SOUTHWEST TO NORTHEAST OVERNIGHT REACHING THE I-65 CORRIDOR BETWEEN 2-4AM. MAINLY FREEZING RAIN. THIS SWITCH FROM FREEZING RAIN TO RAIN IS VERY TRICKY ATTM.
900 PM EST FRI FEB 20 2015 HIGH PRESSURE WILL MOVE OFF THE CAROLINA COAST TONIGHT. A WEAK WARM FRONT WILL DEVELOP AND REMAIN NEAR THE FORECAST AREA THROUGH SATURDAY.
Cold front moving thru the Panhandle at the moment is being pushed by a 8mb/3hr isallobaric anticyclone. Still the general idea is that the isallobaric anticyclone will track sse and weaken by 12Z to around 6-7 mb, thus winds aren't expected to be as strong as they are now in the Panhandle when front arrives in the PB. A cold front will arrive around 21/12Z with moderate northeasterly winds behind it most of Saturday.
759 PM MST FRI FEB 20 2015 THE HIGH PRESSURE THAT HAS BEEN OVER ARIZONA WILL CONTINUE TO WEAKEN AND MOVE WEST TONIGHT AS A SERIES OF LOW PRESSURE SYSTEMS MOVE SOUTH OUT OF CANADA.
424 PM CST FRI FEB 20 2015 A WARM FRONT. THE LAKE WIND ADVISORY WAS EXPANDED A BIT EASTWARD AS IT APPEARS SOME OF THE HIGHER WINDS WILL REACH SW AR/WRN LA. TEMP FCST WAS QUITE DIFFICULT HAS PORTIONS OF THE AREA WILL LIKELY EXPERIENCE WARMING DURING THE OVERNIGHT HRS AS THE WARM FRONT PROGRESSES NORTH. INSTABILITY AND DEEP LAYER SHEAR SHOULD BE SUFFICIENT TO SUPPORT A FEW SEVERE STORMS DURING THE DAY SATURDAY MAINLY SOUTH OF I-30 AHEAD OF A STRONG ARCTIC COLD FRONT.
COLD FRONT IS CURRENTLY MAKING ITS WAY ACROSS THE CENTRAL PORTIONS OF OUR FORECAST AREA AS MILES CITY AND BAKER WINDS ARE NOW GUSTING OUT OF THE NORTHWEST AND BILLINGS WINDS HAVE RECENTLY SWITCHED TO THE NORTHEAST. TEMPERATURES WILL RISE VERY LITTLE IF AT ALL SATURDAY FROM THE MORNING LOWS WITH READINGS IN THE LOWER TO MIDDLE 20S.
This has helped erode the low clouds a bit quicker than yesterday. With a bit more sunshine, most of the Sacramento Valley is running significantly warmer than yesterday. Over the next few days, a series of upper level impulses will continue to drop down into the Great Basin, and eventually form a closed low over CA/NV. The limiting factor will be the low moisture content that will be available to the system.
UPPER LEVEL NORTHWEST FLOW WILL REMAIN OVER THE AREA THROUGH THE PERIOD AS AN UPPER LOW SWINGS FROM HUDSON BAY TO OVER THE EAST COAST.
A cold front will arrive around 21/12Z with moderate northeasterly winds behind it most of Saturday.
ANOTHER UPPER LEVEL TROUGH BUILDS SOUTHEAST THROUGH THE MISSISSIPPI VALLEY TONIGHT INTO SATURDAY WITH MUCH WARMER AND MOIST AIR OVERSPREADING A VERY COLD SURFACE AIR MASS. LIGHT SNOW ACROSS SOUTHEAST TN IN THE CHA VICINITY WILL BE TRANSITIONING TO POSSIBLY SOME SLEET AND THEN FREEZING RAIN AND THEN SPREADING NORTHEAST TOWARD TYS AND TRI OVERNIGHT.
929 PM CST FRI FEB 20 2015 FOLLOWED CLOSELY TO THE 00 UTC NAM AND 21 UTC SREF SOLUTIONS WHICH HAVE THE BEST DEPICTION OF THE HIGH POP.
616 PM CST FRI FEB 20 2015 EARLY THIS AFTN A COLD FRONT HAD ENTERED THE FAR NW CWA WITH AREAS OF VERY LIGHT SNOW AHEAD OF THIS FRONT ACROSS SOUTHERN AND EASTERN MN. THIS WAS MAINLY ASSOCIATED WITH WEAK WAA AHEAD OF AFOREMENTIONED COLD FRONT. WHILE A LARGE UPR LVL LOW ROTATES OVER NERN CANADA AND MAINTAINS A LARGE ERN NOAM TROF THROUGH THE WEEKEND. WINDS ON THE BACKSIDE OF THE HIGH AND AHEAD OF AN INCOMING CDFNT WILL AGAIN BE ELEVATED WITHIN AN ALREADY FRIGID SFC AIRMASS.
THE HIGH PRESSURE THAT HAS BEEN OVER ARIZONA WILL CONTINUE TO WEAKEN AND MOVE WEST TONIGHT AS A SERIES OF LOW PRESSURE SYSTEMS MOVE SOUTH OUT OF CANADA.
637 PM EST FRI FEB 20 2015 HIGH PRESSURE OVER THE MID ATLANTIC REGION THIS EVENING WILL MOVE EAST. LOW PRESSURE OVER THE SOUTHERN PLAINS WILL MOVE THROUGH THE OHIO VALLEY ON SATURDAY AND SPREAD SNOW ACROSS THE REGION.
WITH EVERYONE ELSE WEST OF THERE ALREADY CHANGED OVER TO FREEZING RAIN. WITH WARMER TEMPERATURES JUST UP STREAM FROM THERE. STILL LOOKING AT A SWITCH OVER FROM THE CURRENT SNOWFALL AND A BIT OF SLEET MIX TO FREEZING RAIN OVER THE NEXT FEW HOURS FOR KBNA AND KCKV.
THE RIDGE PORTION OF THE BLOCK WILL BUILD NORTH THROUGH SATURDAY NIGHT.
HIGH PRESSURE REMAINS OVER THE AREA. AREA-WIDE INLAND, TEMPS THIS AFTERNOON ARE 5-15 DEGREES COOLER THAN YESTERDAY AND THIS MARKS A TREND OF COOLER WEATHER TO COME THROUGH THE WEEKEND.
STRONG HIGH PRES RIDGE AT 1035 MB LOCATED OVER ERN NORTH CAROLINA CONTINUES TO SUPPORT LIGHT NE TO E FLOW OVER THE LOCAL AREA.
623 PM EST FRI FEB 20 2015 ACCUMULATING SNOW WILL RETURN ON SATURDAY WITH THE ADVANCE AND PASSAGE OF LOW PRESSURE. THAT TROUGH IS FORECAST TO INTENSIFY AND TAP GULF MOISTURE LATE TONIGHT AND SATURDAY WITH SNOW DEVELOPING OVER THE UPPER OHIO VALLEY REGION BEGINNING IN THE PREDAWN OF SATURDAY. THAT WARM ADVECTION REGIME MAY ALSO SUPPORT A CHANGE TO RAIN OR FREEZING RAIN OVER COUNTIES TO THE SOUTH OF PITTSBURGH. WITH EVENTUAL FREEZING DRIZZLE IN A SATURATED BOUNDARY LAYER.
BULK OF THE CONVECTION WILL RESIDE OVER THE HIGHER TERRAIN. TEMPERATURES WILL BE A LITTLE COOLER ON SATURDAY.
A COLD FRONT WILL MOVE INTO SOUTHEAST OKLAHOMA AROUND 12Z. /ISSUED 424 PM CST FRI FEB 20 2015/ A WARM FRONT. THE LAKE WIND ADVISORY WAS EXPANDED A BIT EASTWARD AS IT APPEARS SOME OF THE HIGHER WINDS WILL REACH SW AR/WRN LA. TEMP FCST WAS QUITE DIFFICULT HAS PORTIONS OF THE AREA WILL LIKELY EXPERIENCE WARMING DURING THE OVERNIGHT HRS AS THE WARM FRONT PROGRESSES NORTH. INSTABILITY AND DEEP LAYER SHEAR SHOULD BE SUFFICIENT TO SUPPORT A FEW SEVERE STORMS DURING THE DAY SATURDAY MAINLY SOUTH OF I-30 AHEAD OF A STRONG ARCTIC COLD FRONT.
VAPOR IMAGERY AND UPPER AIR DATA SHOWED A BROAD RIDGE OVER THE SOUTHEAST.
1103 AM EDT WED APR 8 2015 CURRENT FORECAST GENERALLY ON TRACK WITH WEAK HIGH PRESSURE OVER THE SOUTHEAST U.
MOIST WESTERLY FLOW BEHIND A DEPARTING COLD FRONT WILL BRING MAINLY PARTLY CLOUDY SKIES TO THE REGION TODAY.
WITH TEMPS ALREADY WARMING INTO THE LOWER 70S BY 9 AM. MUCH OF THE LOWER CLOUD COVER/VIS HAVE DIMINISHED NEAR THE TWO MAJOR AIRFIELDS. CURVED HODOGRAPHS IN THE LOW TO MID LEVELS SUPPORT THE POSSIBILITY FOR DISCRETE CELLS BUT WITH GENERALLY WEAK FLOW, MERGING OF CELLS WITH THE LINE LOOKS TO BE A POSSIBILITY AS WELL.
AN UPPER RIDGE WILL BRING PARTLY TO MOSTLY SUNNY AND WARMER WEATHER TODAY AND THURSDAY.
AN UPPER LOW IS NOW DEPARTING TO THE EAST OF THE MEDFORD CWA. A RIDGE WILL BUILD IN FROM THE WEST AND THIS WILL BRING IN TWO DAYS OF DRY AND WARM WEATHER.
1230 PM EDT WED APR 8 2015 CURRENT FORECAST GENERALLY ON TRACK WITH WEAK HIGH PRESSURE OVER THE SOUTHEAST U.
FALLING MORE IN LINE WITH PERSISTENCE AND MAV GUIDANCE VERSES FORECAST AND THE COOLER NAM NUMBERS. WITH THE HIGHEST SPEEDS EXPECTED ACROSS E TX/SE OK. UPPER LOW OVER UT WILL CONTINUE TO PUSH EWD INTO THE PLAINS BY TONIGHT. DRAGGING A COLD FRONT INTO W TX.
955 AM EDT WED APR 8 2015 LATEST ANALYSIS SHOWS AN H100-H70 RIDGE AXIS EXTENDING FROM BERMUDA ACRS THE FL PANHANDLE GENERATING A STEADY E/SERLY FLOW THRU THE LYR. HI PRES RIDGE EXTENDING FROM BERMUDA ACRS THE FL PANHANDLE WILL MAINTAIN A LIGHT TO GENTLE E/SE BREEZE ACRS THE LCL ATLC COMBINED SEAS 2-3FT NEARSHORE AND 3-4FT OFFSHORE.
/ISSUED 456 AM CDT WED APR 8 2015/ UPPER LOW CURRENTLY CENTERED OVER EXTREME NORTHERN CALIFORNIA WILL MOVE EAST THROUGH THE GREAT BASIN THEN ACROSS THE ROCKIES TONIGHT INTO THE CENTRAL PLAINS THURSDAY. COLD FRONT ASSOCIATED WITH THAT SYSTEM WILL MOVE THROUGH EASTERN OKLAHOMA AND WEST CENTRAL AND NORTHWEST ARKANSAS THURSDAY AFTERNOON AND EVENING. SOUTHEAST OKLAHOMA AND WEST CENTRAL AND NORTHWEST ARKANSAS MOST VULNERABLE FOR SIGNIFICANT THUNDER THURSDAY AS THE COLD FRONT MOVES THROUGH.
930 AM EDT WED APR 8 2015 HIGH PRESSURE OVER QUEBEC WILL SLIDE EAST INTO THE MARITIMES BY AFTERNOON. A WARM FRONT WILL LIFT NORTH INTO THE AREA ON THURSDAY. WHILE LOW PRESSURE APPROACHES FROM THE WEST.
WITH DEEP RIDGING STILL IN PLACE COMBINED WITH A LIGHT ONSHORE FLOW NEAR THE SURAFCE THROUGH TONIGHT BELIEVE WILL SEE ANOTHER NIGHT OF GOOD RADIATIONAL/ADVECTION FOG FOG MOST AREA LATE TONIGHT AND EARLY THU MORNING. WITH STRONG RIDGING OVER THE REGION COMBINED WITH A LIGHT ONSHORE FLOW WITH SURFACE DEWPTS IN THE UPPER 60S TO LOWER 70S BELIEVE WE WILL SEE MORE DENSE FOG FORMING LATE THIS EVENING CONTINUING INTO THE EARLY TO MID MORNING HOURS ON THU.
928 AM EDT WED APR 8 2015 HIGH PRESSURE WILL BE EAST NORTHEAST OF THE REGION TODAY. AS AN UPPER RIDGE BUILDS OVERHEAD FROM THE SOUTH.
A COLD FRONT IS EXPECTED TO MOVE THROUGH THE AREA THURSDAY NIGHT. HIGH PRESSURE WILL MOVE INTO THE AREA OVER THE WEEKEND. WILL CONTINUE WITH HIGH POPS ON THURSDAY AND THURSDAY NIGHT AS PROGGED LOW LEVEL JET OF 45-50 KTS INTERACTS WITH AN APPROACHING UPPER TROUGH AND SURFACE COLD FRONT. MAY BE A LULL IN THE PRECIPITATION THREAT THURSDAY AFTERNOON AS THE LOCAL AREA GETS FURTHER INTO THE WARM SECTOR BEFORE COLD FRONT ARRIVES THURSDAY EVENING.
637 AM CDT WED APR 8 2015 COLD FRONT HAD PUSHED WELL SOUTH OF THE AREA THROUGH 07Z. THUNDERSTORMS HAD ALSO DEVELOPED IN NORTHEAST KANSAS NORTH OF THE FRONT WITHIN THE LOW LEVEL JET AXIS WHERE STRONG WARM AIR ADVECTION AS NOTED. LOW PRESSURE MOVES ALONG THE STALLED BOUNDARY TONIGHT. AS WINDS TURN TO THE NORTH ON THE BACK SIDE OF THE LOW PRESSURE CENTER. THE AREA REMAINS ON THE WEST SIDE OF THE LOW ON THURSDAY WHICH WILL RESULT IN ANOTHER DAY SIMILAR TO TODAY TEMPERATURE WISE. DRY AND WARMER WEATHER EXPECTED FOR THE END OF THE WORK WEEK WITH SUNSHINE AND TEMPS BACK TO JUST ABOVE NORMAL.
SUSPECT WITH INCREASED COVERAGE AND RATES OVER THE NEXT SEVERAL HOURS (AS THE MID LEVEL CIRCULATION SLOWLY CHURNS EAST) PERIODIC SNOW WILL MIX IN W/THE RAIN ACROSS THE LOWER VALLEYS OF THE WASATCH FRONT AS WELL. PROGRESSIVE TROUGH EVOLUTION TO THE EAST REMAINS ON TAP THIS AFTERNOON INTO THE EVENING.
925 AM MST WED APR 8 2015 LOW PRESSURE MOVING SLOWLY EASTWARD ACROSS THE GREAT BASIN WILL BRING BELOW NORMAL TEMPERATURES AND LOCALLY GUSTY WINDS TO THE REGION TODAY.
WATER VAPOR SATELLITE SHOWS THE MAIN UPPER LOW CIRCULATION OVER CENTRAL NV AND STARTING TO TRACK TO THE SOUTHEAST. PRECIPITATION ON THE NORTH SIDE OF THE LOW HAS PUSHED INTO THE LOWER SNAKE PLAIN. THE BEST CHANCE FOR PRECIP IN THE WESTERN MAGIC VALLEY WILL BE THROUGH EARLY AFTERNOON THOUGH THE LOW DIGGING FURTHER SOUTH HAS DECREASED CONFIDENCE FOR PRECIP CHANCES IN S-CENTRAL IDAHO TODAY. THE UPPER LOW SWINGING EAST THROUGH NRN NV AS FORECAST. AS THE UPPER LOW MOVES EAST. OUR UPPER-LEVEL FLOW WILL BECOME NWERLY AND A COLD FRONT WILL MOVE THROUGH EARLY TODAY. THE CHANCE OF PRECIP WILL DECREASE SHARPLY TONIGHT BEFORE INCREASING AGAIN THU AFTERNOON AS A WEAK SHORT WAVE TROUGH IMPACTS MAINLY OUR NRN AREAS.
UPPER RIDGING WILL KEEP CONVECTION AT BAY EARLY. CHATTANOOGA AIRPORT, TN 83 64 83 63 / 10 20 30 70 KNOXVILLE MCGHEE TYSON AIRPORT, TN 79 61 82 63 / 30 20 30 70 OAK RIDGE, TN 79 61 82 61 / 30 20 30 70 TRI CITIES AIRPORT, TN 76 56 81 59 / 40 30 30 60.
932 AM MST WED APR 8 2015 GUSTY WINDS WILL CONTINUE TODAY AS A TROUGH AND ASSOCIATED COLD FRONT MOVE ACROSS THE AREA.
409 AM MST WED APR 8 2015 GUSTY WINDS WILL CONTINUE TODAY AS A TROUGH AND ASSOCIATED COLD FRONT MOVE ACROSS THE AREA.