Aikyam-Lab/Synoptic-Bench huggingface dataset:
526 AM EDT FRI APR 3 2015 PERIODS OF SHOWERS ARE EXPECTED TO CONTINUE THROUGH TONIGHT AS LOW PRESSURE AND A COLD FRONT TRACK ACROSS THE AREA. HIGH PRESSURE WILL BUILD IN FOR MUCH OF THE WEEKEND. A COLD FRONT CONTINUE IT/S SLOW ADVANCEMENT THROUGH THE UPPER OHIO VALLEY REGION THROUGH THE EARLY MORNING BEFORE STALLING ACROSS SOUTHERN PA INTO THE MS VALLEY REGION. THE SURFACE WAVE AND COLD FRONT ARE PROGGED TO MOVE QUICKLY ACROSS THE AREA THIS EVENING. EXITING TO THE NORTHEAST OVERNIGHT AS THE MAIN UPPER TROUGH AXIS CROSSES.
255 AM PDT FRI APR 3 2015 HIGH PRESSURE MOVES INTO THE AREA TODAY ALONG WITH SLIGHTLY ABOVE NORMAL TEMPERATURES THROUGH SATURDAY.
AN MCS DEVELOPED A FEW HOURS AGO ALONG THE WARM FRONT ACROSS SOUTHERN MO AND HAS SAGGED ESE INTO NE AR/MO BOOTHEEL. LOW PRESSURE WILL TRACK QUICKLY ALONG THE WARM FRONT INTO SOUTHERN MO BY MID MORNING AND INTO THE OH VALLEY BY 18Z. THE TRAILING COLD FRONT WILL BEGIN ENTERING NE AR AROUND 18Z. AHEAD OF THE COLD FRONT EXPECT GOOD DESTABILIZATION TO OCCUR WITH SURFACE TEMPS CLIMBING WELL INTO THE 70S AND PERHAPS 80 ACROSS NE MS AND SURFACE DEWPOINTS IN THE MID 60S. THE UPPER TROF IS BROAD BUT WIND FIELDS ARE STRONG WITH 500 MB WINDS OF 50-60 KTS THIS AFTERNOON AND 0-6KM BULK SHEAR VALUES OF ABOUT 50 KTS.
455 AM CDT Fri Apr 3 2015 A strong cold front associated with an upper level trough that is moving over the Central Plains is racing southward toward the CWA. MOSS guidance is showing possible high winds for GDP this evening through late Saturday morning so the High Wind Watch remains in effect.
Low temperatures should fall into the lower 30s, and patchy frost cannot be ruled out in some areas. With readings remaining near or above freezing for much of the night and lows not falling into the 20s, do not plan on any freeze headlines for a hard freeze. High pressure moves off to the east on Saturday, with southerly winds reestablishing across the region during the weekend.
646 AM EDT FRI APR 3 2015 HIGH PRESSURE OFF THE COAST WILL DIRECT A WARM SOUTHERLY FLOW INTO THE FORECAST AREA AHEAD OF AN APPROACHING COLD FRONT.
UPPER AIR ANALYSIS LAST EVENING SHOWED A WEAK RIDGE BULGING UP FROM MEXICO OVER TEXAS WITH A BROAD SHALLOW TROUGH OVER THE NORTHERN ROCKIES. THE UPPER TROUGH IS EXPECTED TO PROGRESS TO THE EAST DURING THIS PERIOD AND PUSH THE COLD FRONT THROUGH OUR AREA.
A SERIES OF JETS MOVING ACROSS THE LOWER OHIO VALLEY WILL PRODUCE PRESSURE FALLS OVER THE LOWER OHIO/ TENNESSEE VALLEYS TODAY INCREASING THE PRESSURE GRADIENT. THE ASSOCIATED CYCLOGENESIS WILL QUICKLY MOVE ALONG THE BOUNDARY WITH ASSOCIATED FRONTAL BOUNDARY/PRE-FRONTAL TROUGH PULLING THROUGH THE AREA LATE TODAY AND EVENING. RIDGE OF HIGH PRESSURE BUILDS INTO THE AREA FOR FRIDAY WITH DRIER AIR AND COOLER TEMPERATURES.
EXPECT TO SEE A LINE OF SHOWERS AND POSSIBLE EMBEDDED THUNDERSTORM DEVELOPMENT ALONG AND AHEAD OF THE COLD FRONT THAT WILL BE ENTERING OUR FAR NORTHERN COUNTIES LATE IN THE AFTERNOON AND WILL BE MOVING ACROSS THE REST OF THE AREA AND TO THE COAST AROUND MIDNIGHT.
1228 AM CDT Fri Apr 3 2015 Focus has turned to the n with the advancement of a cold front, which has recently made it thru DHT. 3hr Isallobaric anticyclone is impressive 9-10mb in SE CO. Isallobaric anticyclone will track sewd and strongest post front winds this morning around 15-18z will be ne of TAF sites, still sustained around 20kts at MAF looks very reasonable.
257 AM MDT FRI APR 3 2015 WEAK QG ASCENT ASSOCIATED WITH AN UPPER LEVEL TROUGH COMBINED WITH WEAK UPSLOPE WILL KEEP LIGHT SNOW GOING ALONG THE FRONT RANGE FOOTHILLS AND MOUNTAINS AND PALMER DIVIDE THROUGH THE EARLY MORNING HOURS.
358 AM CDT FRI APR 3 2015 THE COLD FRONT IS QUICKLY MOVING THROUGH OKLAHOMA THIS MORNING.
511 AM EDT FRI APR 3 2015 A COLD FRONT JUST SOUTH OF THE AREA WILL STALL ACROSS SOUTHERN OHIO TODAY AS AN AREA OF LOW PRESSURE MOVES NORTHEAST ALONG THE BOUNDARY.
Otherwise, dry conditions are expected across the plains/valleys as a weak ridge of high pressure moves over the region.
358 AM EDT FRI APR 3 2015 AN APPROACHING COLD FRONT WILL STALL OUT ACROSS PENNSYLVANIA TOMORROW INTO SATURDAY. A WAVE OF LOW PRESSURE WILL FORM AND RIDE NORTHEAST ALONG THE STALLED FRONT.
TEMPS ACROSS THE REGION AT 2 AM WERE AT OR AROUND FREEZING ON THE PALMER DVD AND RATON MESA REGIONS AND WERE IN THE M/U30S ACROSS THE REST OF THE LOWER PLAINS. WITH COOLER CONDITIONS AND HIGHER RH VALUES OVER THE PLAINS. OVER THE HIGHER ELEVATIONS.
440 AM EDT FRI APR 3 2015 AN APPROACHING COLD FRONT WILL STALL OUT ACROSS PENNSYLVANIA TOMORROW INTO SATURDAY. A WAVE OF LOW PRESSURE WILL FORM AND RIDE NORTHEAST ALONG THE STALLED FRONT.
401 AM CDT FRI APR 3 2015 FIRST COLD FRONT MOVES THROUGH TONIGHT. EVOLUTION OF THE COLD FRONT AND CONVECTIVE INITIATION SOUTHWARD ALONG IT WILL BE NOTICEABLE AS IT FORMS TOWARD THE ARKLAMISS REGION BY 6PM TODAY THEN FARTHER SOUTH TOWARD BATON ROUGE BY MIDNIGHT FRIDAY NIGHT. THE RIDGING BEHIND THE FRONT WILL BRIDGE THE SOUTHERN END CAUSING A DYNAMICALLY COMPRESSED INVERSION TO SET UP AT ABOUT 4000' AGL.
WITH AN UPPER-LEVEL TROUGH FROM WESTERN WY THROUGH UT TOWARD SOUTHERN CA.
330 AM PDT FRI APR 3 2015 WEAK OFFSHORE FLOW TODAY WILL BRING SIGNIFICANTLY WARMER WEATHER WITH THE GREATEST WARMING WEST OF THE MOUNTAINS.
A LOW PRESSURE SYSTEM DEVELOPING ACROSS THE OHIO VALLEY WILL TRACK TO OUR SOUTH FRIDAY NIGHT.
A WARM FRONT WILL LIFT NORTH ACROSS NC AND VA THIS MORNING. WARM SOUTH TO SOUTHWEST FLOW WILL RESULT UNTIL A COLD FRONT CROSSES OUR REGION LATE TONIGHT THROUGH EARLY SAT. COOLER HIGH PRESSURE WILL FOLLOW FOR THE WEEKEND. A VERY BREEZY SSW WIND AND EARLY APRIL SUN IN THE WARM SECTOR SHOULD CAUSE TEMPERATURES TO SOAR INTO THE LOWER TO MIDDLE 80S BY MID-LATE AFTERNOON. THEN YIELD TO A BROKEN BAND OF SHOWERS ALONG THE COLD FRONT BETWEEN 06-09Z IN THE NW AND 10-15Z SE. IN THE LOWER 60S TO NEAR 70. HIGH PRESSURE WILL SETTLE DIRECTLY OVERHEAD SATURDAY NIGHT.
626 AM EDT FRI APR 3 2015 A COLD FRONT JUST SOUTH OF THE AREA WILL STALL ACROSS SOUTHERN OHIO TODAY AS AN AREA OF LOW PRESSURE MOVES NORTHEAST ALONG THE BOUNDARY.
A WEAK COLD FRONTAL PASSAGE FRIDAY FROM NORTHWEST TO SOUTHEAST WILL RESULT IN ISOLATED TO SCATTERED SHOWERS. THE COLD FRONT IS RELATIVELY WEAK.
A CLASSIC AGEOSTROPHIC RESPONSE IS SEEN IN CROSS SECTIONS OF THE HIGH RESOLUTION MODELS. WARMER AIR ALOFT /WITH H850MB TEMPERATURES SLOWLY RISING THROUGH THE DAY/ WILL SPREAD EAST OF THE HIGHER TERRAIN TO THE WEST.
322 AM CDT FRI APR 3 2015 LATEST WATER VAPOR SATELLITE IMAGERY INDICATING UPPER LEVEL TROUGHS OVER HUDSON BAY AND OFF THE BRITISH COLUMBIA COAST.
THIS LOW WILL HEAD ENE ALONG A STALL FRONT AND INTO THE OH VALLEY TODAY. TODAY: CLEARING AND COOLER. HIGHS WILL BE SVRL DEGS COOLER THAN YESTERDAY AND ABOUT 5F BELOW NORMAL.
A COLD FRONT WILL THEN TRAIL SOUTHWESTWARD THROUGH THE TENNESSEE VALLEY AND TOWARDS THE NORTHWESTERN GULF COAST. AN UPPER RIDGE CENTERED OVER CENTRAL MEXICO WILL DRIFT EASTWARD THROUGH THE PERIOD. A COLD FRONT WILL PUSH INTO NORTHERN FLORIDA AND THEN STALL ACROSS CENTRAL FLORIDA SATURDAY NIGHT.
Strong low level cold air advection this afternoon behind the 850 mb low/trough will lead to slowly falling temperatures across portions of our area.
501 AM EDT FRI APR 3 2015 HIGH PRESSURE OFF THE COAST WILL DIRECT A WARM SOUTHERLY FLOW INTO THE FORECAST AREA AHEAD OF AN APPROACHING COLD FRONT.
Temps today not likely to chance too far off of where they are now, with cool air pushing into the region from the north behind the boundary and plenty of cloud cover in place blocking too much sunshine for most of the CWA. whereas the 00Z runs are warmer longer, and not hinting to frozen precip until maybe on the extreme back edge, around and after 00Z this afternoon when the bulk of the precip has exited the region.
TODAY THROUGH SATURDAY NIGHT UPPER TROUGH IS CROSSING THE CENTRAL CONUS WITH A RIDGE BUILDING OVER THE WEST COAST. THERE IS A SLIGHT CHANCE FOR RAIN/SNOW SHOWERS IN THE MORNING WITH TEMPS BELOW FREEZING. UPPER RIDGE MOVES OVER THE REGION ON SATURDAY AS LOW-LEVEL HIGH PRESSURE STRENGTHENS TO THE SOUTHWEST.
306 AM EDT FRI APR 3 2015 HIGH PRESSURE OFF THE COAST WILL DIRECT A WARM SOUTHERLY FLOW INTO THE FORECAST AREA AHEAD OF AN APPROACHING COLD FRONT.
A WARMER AND DRIER SOUTHWEST FLOW ALOFT WILL ALLOW FOR NEAR TO SLIGHTLY ABOVE NORMAL MAX TEMPERATURES TODAY. A COLD FRONT RESIDING NEAR THE PACNW COAST WILL MOVE INLAND LATER TODAY. WITH A CHANCE OF LIGHT SHOWERS MAINLY OVER THE HIGHER TERRAIN OF SW IDAHO ON SATURDAY. TEMPERATURES WILL BE 3 TO 6 DEGREES COOLER ON SATURDAY.
THEN TRACK NORTHEAST ACROSS OUR CWA PULLING A COLD FRONT ACROSS THE AREA FROM LATE THIS MORNING THROUGH MID AFTERNOON.
WESTERLY SURFACE FLOW ALONG WITH WARM ADVECTION AHEAD OF WEAK COLD FRONT SHOULD ALLOW FOR MODEST TEMPERATURE RECOVERY ACROSS THE W-S WITH COOLER TEMPERATURES FARTHER EAST. ANY LINGERING -RASN WILL BE CONFINED TO NW MN THIS EVENING AS WEAK TROUGH SHIFTS EAST.
THE COOLER AIRMASS WILL MAKE FOR A RATHER CHILLY START TO THE DAY ON SATURDAY WITH PATCHY FROST POSSIBLE ACROSS MUCH OF THE REGION.
344 AM CDT FRI APR 3 2015 LOW PRESSURE WILL TRACK ACROSS SOUTHERN MISSOURI THIS MORNING AND BE INTO PA BY TONIGHT. WEAK HIGH PRESSURE WILL MOVE ACROSS THE UPPER MIDWEST TONIGHT AND SATURDAY.
A WAVE OF LOW PRESSURE OVER OKLAHOMA EARLY THIS MORNING WILL TRAVEL ALONG THE FRONT AND LEAD TO MORE THUNDERSTORMS TODAY. THE LOW WILL PASS BY TO OUR NORTH AND IT WILL SEND A TRAILING COLD FRONT THROUGH OUR AREA TONIGHT.
MILD TEMPERATURES ARE EXPECTED ONCE AGAIN ON FRIDAY WITH COOLER TEMPERATURES ANTICIPATED FOR SATURDAY.
TIGHTENING PRESSURE GRADIENT WILL ALLOW FOR GUSTY WINDS TO DEVELOP OUT AHEAD OF AN APPROACHING COLD FRONT BY LATE TOMORROW MORNING AND CONTINUE THROUGH THE AFTERNOON. CHATTANOOGA AIRPORT, TN 59 77 47 60 / 20 50 80 10 KNOXVILLE MCGHEE TYSON AIRPORT, TN 56 76 49 56 / 40 50 70 10 OAK RIDGE, TN 57 74 49 57 / 40 60 80 10 TRI CITIES AIRPORT, TN 53 74 46 54 / 40 60 80 10.
WE WILL SEE A WEAK UPPER TROF MOVE OVERHEAD FOR FRIDAY. IN GENERAL SYNOPTIC SCALE MIXED DOWN WINDS ARE SIGNIFICANTLY LIGHTER EVEN WITH A WESTERLY COMPONENT TO THE LOW LEVEL FLOW ENHANCING MIXING. THE UPPER LEVEL PATTERN WILL FEATURE A TROUGH OVER THE WESTERN UNITED STATES.
SKIES ARE MOSTLY CLEAR TO PARTLY CLOUDY WITH TEMPERATURES IN THE LOWER TO MID 70S ALONG THE ISLAND CHAIN. A WESTERN ATLANTIC RIDGE EXTENDS ACROSS THE GULF COAST REGION AND WELL INTO THE NORTHERN GULF OF MEXICO.
A COLD FRONT WILL MOVE THROUGH THE STATE TODAY. CHANCES FOR THUNDERSTORMS WILL INCREASE IN THE NORTH LATER THIS EVENING AND CONTINUE OVERNIGHT AHEAD OF A COLD FRONT.
320 AM EDT FRI APR 3 2015 A COLD FRONT JUST SOUTH OF THE AREA WILL STALL ACROSS SOUTHERN OHIO TODAY AS AN AREA OF LOW PRESSURE MOVES NORTHEAST ALONG THE BOUNDARY.
TEMPERATURES RANGED FROM THE LOWER 20S IN NORTH CENTRAL MINNESOTA TO THE LOWER 30S IN PORTIONS OF NW WI.
AS HIGH PRESSURE REMAINS OVER SOUTH FLORIDA THROUGH FRIDAY. A COLD FRONT OVER THE CENTRAL UNITED STATES WILL MOVE SOUTHWARD INTO CENTRAL FLORIDA LATE THIS WEEKEND BEFORE WASHING OUT AS HIGH PRESSURE REMAINS OVER SOUTH FLORIDA.
WITH EVENTUAL VFR SKIES EXPECTED AT AROUND THE TIME OF THE LATE AFTERNOON ARRIVAL OF THE COLD FRONT. 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.
405 AM MDT FRI APR 3 2015 THE UPPER TROUGH WAS CROSSING WRN CO EARLY THIS MORNING WITH SNOW CONTINUING OVER THE NRN CO MTNS PER THE 08Z ASPEN METAR OBSERVATION AND SKI RESORT AND CDOT WEBCAMS. THE UPPER TROUGH WILL BE MOVING OFF TO THE EAST BY 12Z THIS MORNING. EXPECT SUNNY/ MOSTLY SUNNY SKIES THIS AFTERNOON TO LEAD INTO A CLEAR NIGHT TONIGHT AS A LOW AMPLITUDE RIDGE SLIDES OVERHEAD. ZONAL FLOW SETS UP ACROSS THE AREA AS LOW PRESSURE TO THE NORTHWEST AND OVER HUDSON BAY TO THE NORTHEAST KEEP MUCH OF THE NATION IN WEAK RIDGING.
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. FRIDAY NIGHT/SATURDAY MORNING: TRANQUIL WEATHER DURING THIS PERIOD AS HIGH PRESSURE REMAINS IN CONTROL ACROSS THE CENTRAL PLAINS. RECENTLY, THINGS HAVE BLOOMED, SO BE AWARE THAT FREEZING TEMPERATURES ARE POSSIBLE THIS MORNING. THE NET RESULT IS CONTINUED WEAK HIGH PLAINS LEE TROUGHING AND SEASONAL HIGH TEMPERATURES FOR SATURDAY - 60S.
EXPECT MUCH LESS WIND AND COOLER TEMPERATURES TODAY.
LOW PRESSURE WILL MOVE EAST ALONG A FRONTAL BOUNDARY TODAY AND THIS WILL BRING ANOTHER BATCH OF RAIN TO THE REGION. TIME OF DAY WILL BE FAVORABLE TO KEEP PRECIPITATION ALL RAIN DESPITE SUB-FREEZING 850MB TEMPS BY MID AFTERNOON. HIGH PRESSURE STILL EXPECTED SATURDAY AND SATURDAY NIGHT. THUS CONTINUED TO SIDE TOWARD WARMER END OF GUIDANCE FOR SATURDAY WITH EXPECTED SUNNY SKIES.
456 AM CDT Fri Apr 3 2015 (Today and Tonight) Cooler temperatures are in store for West Central Texas today as a strong cold front moves across the area. Temperatures will be much cooler today, with afternoon highs ranging from the upper 60s north, to around 80 across far southern counties. Temperatures will be chilly overnight with lows ranging from the lower 40s across the Big Country, to the middle and upper 40s elsewhere.
328 AM EDT FRI APR 3 2015 PERIODS OF SHOWERS ARE EXPECTED TO CONTINUE THROUGH TONIGHT AS LOW PRESSURE AND A COLD FRONT TRACK ACROSS THE AREA. HIGH PRESSURE WILL BUILD IN FOR MUCH OF THE WEEKEND. A COLD FRONT CONTINUE IT/S SLOW ADVANCEMENT THROUGH THE UPPER OHIO VALLEY REGION THROUGH THE EARLY MORNING BEFORE STALLING ACROSS SOUTHERN PA INTO THE MS VALLEY REGION. THE SURFACE WAVE AND COLD FRONT ARE PROGGED TO MOVE QUICKLY ACROSS THE AREA THIS EVENING. EXITING TO THE NORTHEAST OVERNIGHT AS THE MAIN UPPER TROUGH AXIS CROSSES.
EXPECT MUCH COOLER CONDITIONS WITH TEMPERATURES FALLING THROUGH THE MORNING HOURS. AND A FEW SPOTS ACROSS FAR NE OK/NW AR MAY DIP CLOSE TO THE FREEZING MARK.
Will dry out from NW-SE in the evening as the cold front pushes through. Strong cold advection will bring temps several degrees below normal Fri night/Sat, but clear skies and dry wx as high pressure builds from the NW.
AND SPCLY THE HIGHER TERRAIN. SO THE HIGHEST POPS (LIKELY VALUES FOR LGT RAIN/SNOW) WILL BE OVER THESE AREAS.
STRONG ARCTIC HIGH PRESSURE WILL ALSO BE BUILDING SOUTH. FORTUNATELY WINDS WILL BE LIGHT WITH THE ARCTIC HIGH PRESSURE.
312 AM EST SUN FEB 22 2015 LOW PRESSURE WILL PULL AWAY FROM THE REGION TODAY AND ACROSS THE MARITIMES. A STRONG COLD FRONT WILL CROSS THE AREA TONIGHT.
348 AM CST SUN FEB 22 2015 ARCTIC HIGH PRESSURE WILL BE PRESSING SOUTH INTO THE LOWER 58 STATES THIS AM. MAY BE ABLE TO NUDGE BACK UP PAST FREEZING OVER SOUTHERN AREAS THIS AFTERNOON.
The low clouds will begin to clear from the northwest behind this disturbance by late tonight, but mid/high level cloudiness spreading toward the area from the plains should keep skies from clearing significantly overnight. Expect temperature drop to accelerate over the next few hours as much colder/drier Arctic high pressure begins to build into the area.
A COLD FRONT WILL SLOWLY MAKE ITS WAY SOUTH ACROSS THE FORECAST AREA DURING THE DAY SUNDAY AND INTO SUNDAY NIGHT.
THE ARCTIC AIR SHOULD BE WELL ENTRENCHED OVER THE AREA FOR TONIGHT WITH THE CENTER OF THE HIGH EXPECTED TO DRIFT ACROSS WESTERN MINNESOTA INTO IOWA.
WARM ADVECTION ALOFT OVER THE CWA CONTINUES WITH A TONGUE OF ABOVE FREEZING TEMPERATURES BASICALLY JUMPING WEST OF THE RIDGES UP INTO THE PITTSBURGH AREA STILL AT THIS HOURS. WHILE SURFACE TEMPERATURES ARE ABOVE FREEZING. THIS WILL LIKELY ALLOW FOR A FAIR AMOUNT OF FREEZING UP OF SURFACE WATER FROM ANY MELTING OR RAIN/FREEZING RAIN THIS AFTERNOON IN AREAS EAST OF PITTSBURGH AS WELL AS SOUTHWARD TOWARD NORTHERN WEST VIRGINIA. AND IS NOW PRIMARILY AFFECTING THE RIDGES. THIS WILL INCREASE THE CHANCE FOR FREEZING DRIZZLE EVERYWHERE. AND WILL LIKELY COMMENCE IN THE RIDGES BEFORE TOO LONG. THIS HAS ALLOWED FOR THE ISSUANCE OF FREEZING RAIN AND WINTER WEATHER ADVISORIES FOR THESE LOCATIONS.
20Z water vapor shows a broad and deep upper trough centered over the Hudson bay and encompassing much of North America. At the surface, observations show another 1044 MB ridge of high pressure over Alberta poised to move south into the plains. However it appears as though the models fail to generate much QPF due to dry air in the lower atmosphere. Have kept the forecast dry across northeast KS where the low level dry air is progged to be deeper.
THE COLD FRONT HAS SLOWED A BIT, SITTING NEAR CHA, 4A9, TO BETWEEN CMD AND BHM. THE COLD WEATHER PATTERN WILL CONTINUE THIS WEEK AS UPPER VORTICES CONTINUES TO DIG THE LARGE TROF OVER CANADA INTO THE CENTRAL AND EASTERN CONUS. THE SOUTHERN STREAM WILL BRING THE UPPER LOW THAT IS IN THE PROCESS OF DIGGING INTO CA/NV TODAY EASTWARD THRU THE SOUTHERN STATES.
OVERNIGHT TEMPERATURES ARE EXPECTED TO FALL BELOW FREEZING ACROSS ALL AREAS.
WIDESPREAD PRECIPITATION CURRENTLY ACROSS THE NORTHERN TERMINALS AHEAD OF A COLD FRONT.
Persistent eastern Pacific upper level ridging will remain in place in some form through this period keeping the door open for cold air to move south into our region.
A strong cold front will arrive around sunrise bringing brisk northeasterly winds most of the day. The rain will eventually change over to freezing rain after sunset.
352 AM CST SUN FEB 22 2015 STRONG COLD ADVECTION WILL CONTINUE TODAY AS THE ARTIC HIGH PRESSURE PUSHES INTO THE REGION.
TEMPERATURES WILL DROP BACK BELOW FREEZING BY LATE THIS EVENING, AND MAIN CONCERNS OVERNIGHT WILL BE FREEZING OF STANDING WATER FROM THE SUBSTANTIAL RAINFALL AND MELTING SNOW TODAY.
ON THE SYNOPTIC SCALE A SUBTLE TROUGH AXIS ASSOCIATED WITH AN UPPER LOW OVER THE HUDSON BAY WILL SWING THROUGH THE UPPER MIDWEST TONIGHT INTO EARLY SUNDAY. AND WEAK LARGE SCALE LIFT ASSOCIATED WITH THE MID-LEVEL TROUGH WILL LIKELY ENHANCE SNOW SHOWERS LATE TONIGHT. UP TO AN INCH OR TWO IN THE HIGHER TERRAIN OF ASHLAND/IRON COUNTIES.
1157 PM CST SAT FEB 21 2015 FOR 06Z TAFS /ISSUED 935 PM CST SAT FEB 21 2015/ LATEST SURFACE OBSERVATIONS SUGGEST THAT COLD FRONT CURRENTLY EXTENDS FROM HACKLEBURG NORTH-NORTHEASTWARD ACROSS LAWRENCE/LIMESTONE COUNTIES AND INTO SOUTHERN TENNESSEE. MINOR ADJUSTMENTS WERE MADE TO HOURLY TEMPERATURE/DEWPOINT GRIDS TO REFLECT CURRENT POSITION OF THE COLD FRONT.
PRIMARY FEATURES AT 500 MB WERE STILL THE STRONG RIDGE THAT EXTENDED FROM THE EASTERN PACIFIC UP INTO NORTHWEST CANADA AND A CLOSED LOW OVER THE SOUTHERN PART OF HUDSON BAY.
High pressure aloft and at the surface will continue to build over the area resulting in clearing skies.
908 PM MST SAT FEB 21 2015 A COLD FRONT WILL APPROACH NORTHERN ARIZONA TONIGHT AND STALL JUST SOUTH OF THE UTAH BORDER ON SUNDAY.
136 AM EST SUN FEB 22 2015 A COLD FRONT WILL PUSH THROUGH THE REGION THIS EVENING.
/ISSUED 851 PM CST SAT FEB 21 2015/ COLD FRONT FROM BRENHAM TEXAS.
SOME FREEZING FOG NORTH. AN OVERALL NORTHERLY SFC FLOW WILL BE ENFORCED AS CANADIAN HIGH PRESSURE CONTINUES TO EXERT ITS INFLUENCE ACROSS A LARGE SNOW PACK COVERED AREA TO OUR NORTH. AS INFLUENCES OF UPPER MIDWEST/CANADIAN HIGH PRESSURE BASED SYSTEM WORKS INTO MID STATE.
346 AM CST Sun Feb 22 2015 Early this morning an elongated mid-level trough extended from west of the Great Lakes region into northern Nevada with a storm system anchored over the central Rockies and western Kansas. In case the low-levels are able to saturate more this morning, have kept slight to low-end chance PoPs in across the far southern part of the forecast area with snow accumulations likely ranging from a dusting to around one-half inch. This cold air advection combined with overcast skies will result in well below-normal temperatures today as highs should only reach into the low/mid 20s.
THIS EVENING THROUGH SUNDAY NIGHT THE LATEST WATER VAPOR IMAGES AND SHORT-TERM MODEL GUIDANCE INDICATED A LARGE TROUGH COVERING MOST OF THE CONUS WITH A SHARP RIDGE JUST OFF THE WRN NOAM COAST. AHEAD OF THIS TROUGH THERE WERE SNOW SHOWERS OVER MUCH OF THE REGION. ALTHOUGH THEY WILL PERSIST MOST OF THE NIGHT ACROSS NERN WY AND SWRN SD AHEAD OF THE UPPER TROUGH. A DRY DAY IS EXPECTED SUNDAY AS THE UPPER TROUGH AXIS WASHES OUT JUST SOUTH OF THE CWA AND UPPER HEIGHTS BUILD SLIGHTLY. THIS COULD FORCE THE HIGHER ELEVATIONS OF NERN WY AND THE BLKHLS TO SEE RISING TEMPS AFTER MIDNIGHT.
WATER VAPOR LOOP INDICATED AN UPPER LEVEL TROUGH EXTENDED FROM HUDSON BAY TO ND. TROUGH WAS MOVING TO THE SOUTHEAST ABOUT 30 KNOTS.
HAVE ADJUSTED THE HIGHER POPS UNTIL AFTER MIDNIGHT AND REMOVED THE MENTION OF THUNDER AS MOST OF THE LIGHTING ACTIVITY TO THE NORTH HAS ABATED.
ARCTIC HIGH PRESSURE WILL CROSS THE REGION SUN NIGHT INTO MON. A WARMING TREND WILL COMMENCE MON-TUE AHEAD OF A CDFNT ASSOCIATED WITH THE LOW PRES AREA. THE HIGH PRES AIRMASS WILL EXIT THE REGION FRI.
STRONG ARCTIC HIGH PRESSURE BUILDING ACROSS THE NORTHERN PLAINS THIS MORNING. ARCTIC HIGH PRESSURE DRIFTS SOUTHEAST ACROSS THE DAKOTAS TODAY AND INTO THE CENTRAL PLAINS TONIGHT.
LIGHT SNOW DEVELOPING ACROSS THE HIGH PLAINS THIS AFTERNOON WILL CONTINUE TO EXPAND EASTWARD IMPACTING PORTIONS OF CENTRAL AND SOUTH CENTRAL KANSAS LATE TONIGHT AND INTO SUNDAY. LITTLE RISE IN TEMPERATURES CAN BE EXPECTED WITH HIGHS REMAINING IN THE LOW/MID 20S.
AS WELL AS THE HIGHLIGHTS OVER THE EXTREME WEST /TETON MTS & STAR VALLEY/ AS SNOW HAS ENDED AND WINDS HAVE WEAKENED. TONIGHT THROUGH SUNDAY SURFACE PRESSURE CHANGE ANALYSIS SHOWS A COUPLE OF SURGES IN THE COLD HIGH PRESSURE. A DEVELOPING AND STRENGTHENING AREA OF LOW PRESSURE OVER THE DESERT SOUTHWEST WILL DISRUPT THE OVERALL FLOW PATTERN.
AMOUNTS SHOULD RANGE FROM 9-11" ACROSS WEST-CENTRAL KANSAS, 3-7" ACROSS THE HIGHWAY 283 CORRIDOR, AND 2-4" ACROSS SOUTH CENTRAL KANSAS. ALSO HAVE ADDED AREAS OF BLOWING SNOW LATE TONIGHT AS 15-25 MPH NORTHEASTERLY WINDS ARE EXPECTED BEHIND THE SYSTEM AND AS THE GRADIENT INCREASES VIA APPROACHING HIGH PRESSURE FROM THE NORTH.
SKIES WILL BE CLEARING WITH DIMINISHING WINDS SO THE HIGHS IN THE SINGLE DIGITS TO LOWER TEENS ABOVE ZERO WILL NOT FEEL QUITE SO BAD.
RELATIVELY DRY AND COLD PATTERN THROUGH THE EXTENDED AS A SERIES OF UPPER LEVEL LOWS ROTATE AROUND THE HUDSON BAY LEADING TO PERIODIC DOSES OF ARCTIC AIR.
337 AM EST SUN FEB 22 2015 THE LOW PRESSURE THAT BROUGHT THE SNOW TO THE REGION WILL TRACK WELL OFF THE EAST COAST TODAY AS YET ANOTHER ARCTIC FRONT CROSSES THE REGION THIS EVENING.
311 AM EST SUN FEB 22 2015 AN ARCTIC COLD FRONT MOVES THROUGH THE REGION LATE TODAY WITH COLD AIR FOR THE START OF THE WEEK.
High pressure aloft and at the surface will continue to build over the area overnight resulting in clearing skies.
1118 PM CST SAT FEB 21 2015 LOW PRESSURE THAT TRACKED TO OUR SOUTH LAST NIGHT BROUGHT NEW SNOW TO CENTRAL MO AND IL. BEHIND THIS LOW. AN ARCTIC HIGH PRESSURE SYSTEM WAS FILLING INTO THE AREA. 12Z GUIDANCE IS NOTICEABLY WARMER AND SLOWER WITH THE CAA INTO THE AREA TONIGHT. THIS MEANS THAT TEMPS WILL BE WARMER THAN PREVIOUSLY FORECAST FOR TONIGHT.
1112 PM CST SAT FEB 21 2015 A SPRAWLING H5 TROF ENCOMPASSED MUCH OF THE U. WITH THE CENTER OF THE CLOSED LOW OVER HUDSON BAY.
HAVE EXTENDED THE HIGH RISK OF RIP CURRENTS THROUGH 6 AM SUNDAY.
241 AM EST SUN FEB 22 2015 THE PRESSURE GRADIENT WILL BEGIN TO WEAKEN TODAY AS HIGH PRESSURE OVER THE WESTERN ATLANTIC SHIFTS FURTHER TO THE NORTHEAST. A WEAK AREA OF LOW PRESSURE WILL ALSO FORM ACROSS THE SOUTHEAST. TEMPERATURES WILL WARM TO NEAR 80 INTO THE LOWER 80S TODAY.
MAINLY DRY CONDITIONS EXPECTED THROUGH THE DAY AS ANY POCKETS OF FREEZING DRIZZLE SHOULD DIMINISH BEFORE DAYBREAK. WITH THE HIGHER AMOUNTS CLOSE TO ONE INCH ALONG AND NORTH OF INTERSTATE 80 AND SOUTH ALONG THE RIDGES.
A RIDGE OF HIGH PRESSURE CURRENTLY OVER THE GULF OF ALASKA CONTINUES TO KEEP THE DOOR OPEN FOR ARCTIC WAVES TO PUSH SOUTHWARD ACROSS THE PLAINS.
322 AM CST SUN FEB 22 2015 AN ARCTIC HIGH PRESSURE TRACKING SOUTHEASTWARD ACROSS THE REGION WILL PRODUCE BITTER COLD TEMPERATURES TODAY AND TONIGHT. WHICH SHOULD RESULT IN HIGHS IN THE SINGLE DIGITS BELOW TO THE LOWER TEENS.
WATCHING A POTENTIAL THREAT FOR LIGHT SNOW GRAINS OR FREEZING DRIZZLE FARTHER NORTH AS LOWER CLOUD DECK DEVELOPS LATE THIS EVENING AND AFTER MIDNIGHT.
THE COLD FRONT IS OVER ALL BUT OUR SOUTHERN TIER OF LOUISIANA PARISHES. WE ARE THINKING THE CLOUDS WILL WORK BACK IN THOUGH WITH TROUGH DIGGING OVER THE FRONT RANGE AT THIS TIME.