Aikyam-Lab/Synoptic-Bench huggingface dataset:
1000 AM CDT FRI MAR 18 2016 A cold front is moving into the northern Concho Valley and progressing through the area faster than previously forecast. Also, PoPs were lowered across much of the Big Country and western counties where the cold front has cleared. A strong cold front will move across the terminals today, with FROPA at KABI around noon, KSJT by 20Z and the southern terminals by 22Z. /issued 432 AM CDT FRI MAR 18 2016/ (Today and Tonight) A strong cold front will move south across the area today, with showers and a few strong to severe storms possible through this evening. A much colder airmass will filter into the area tonight, with overnight lows ranging from the mid and upper 30s north, to the lower 40s along the I-10 corridor.
614 AM CDT FRI MAR 18 2016 An upper level trough is currently spreading east across the Plains early this morning. The trough will continue to spread to the east and close off into a low across Iowa/northern Missouri on Saturday.
621 AM CDT FRI MAR 18 2016 ELONGATED UPPER TROF WILL PROGRESS SOUTHWARD TOWARD IOWA TODAY AS COLD ADVECTION CONTINUES. TEMPERATURES WILL BE COOLER THAN THE PAST FEW DAYS WITH CANADIAN AIRMASS DROPPING INTO THE STATE. READINGS WILL GENERALLY BE AROUND 10 DEGREES COOLER TODAY ALONG WITH A BRISK NORTHWEST WIND. THE PROXIMITY OF THE LOW WILL HELP TO MAINTAIN THE THREAT OF ISOLD TO SCATTERED SNOW SHOWERS IN NORTHERN IOWA TONIGHT. THIS LOW IS EXPECTED TO DROP SOUTH INTO IOWA ON SATURDAY WITH LAPSE RATES STEEPENING WITH DAYTIME HEATING. TEMPERATURES WILL REMAIN QUITE COOL THROUGH THE DAY WITH THERMAL TROF BUILDING INTO THE STATE AND EXTENSIVE CLOUD COVER UNDERNEATH THE UPPER LOW.
With good mixing this afternoon relative humidity values will fall into the lower 20s. East-west oriented trofiness lingers across the Great Lakes and Upper Midwest as the main low departs, presenting a fairly unusual configuration to the synoptic pattern and setting the stage for an unsettled weekend. By tonight an upper impulse over the northern Rockies will dig into the Plains and close off the upper low over the Upper Midwest. This forecast reflects the raw model numbers which keep us on the lower end of guidance.
INCREASING COVERAGE OF SHOWER AND THUNDERSTORM ACTIVITY THIS EVENING THROUGH EARLY TONIGHT IN ADVANCE OF A COLD FRONT. ASSOCIATED COLD FRONT PREDICTED TO ENTER THE CWA TONIGHT AND MOVE OFFSHORE BY EARLY SATURDAY. EXPECT STRONG OFFSHORE FLOW/SMALL CRAFT ADVISORY CONDITIONS OVER THE WATERS AFTER FROPA EARLY SATURDAY OWING IN PART TO COLDER AIR OVER WARMER SST VALUES.
SHOWERS AND THUNDERSTORMS WILL CONTINUE ALONG THE RED RIVER THROUGH THE EARLY AFTERNOON WITHIN ZONE OF ISENTROPIC ASCENT AND LOW LEVEL CONVERGENCE, BEFORE THE COLD FRONT MAKES ITS WAY INTO NORTHERN TX.
A RIDGE OF HIGH PRESSURE EXTENDS WEST ACROSS THE BAHAMAS AND THE FLORIDA PENINSULA. LOW PRESSURE STRETCHES FROM TEXAS TO THE BAY OF CAMPECHE. THE SURFACE PATTERN HAS CHANGED DUE TO A SOUTHERN STREAM UPPER LOW PRESSING EAST THROUGH OLD MEXICO. DOWNSTREAM FROM THIS LOW. HIGH PRESSURE WILL REMAIN ANCHORED FROM THE NORTHERN BAHAMAS TO CENTRAL FLORIDA THIS AFTERNOON AND TONIGHT. LOW PRESSURE WILL DEVELOP OVER THE WESTERN GULF OF MEXICO THIS AFTERNOON AND MOVE QUICKLY NORTHEASTWARD.
A RIDGE OF HIGH PRESSURE WILL BUILD IN OVER THE REGION TODAY THROUGH THE WEEKEND.
A LOW PRESSURE SYSTEM WILL DEVELOP OVER THE DEEP SOUTH TONIGHT.
718 AM EDT FRI MAR 18 2016 LOW PRESSURE WILL EXIT INTO THE CANADIAN MARITIMES TODAY. ALLOWING A COLD FRONT TO SWEEP ACROSS THE REGION.
641 AM CDT FRI MAR 18 2016 400 AM CDT MAIN FOCUS IN THE NEAR TERM IS ON A TRANSITION TO COOLER THAN NORMAL WEATHER INTO THE WEEKEND. WHILE A COLD FRONT TRAILED FROM LOW PRESSURE OVER NORTHERN NEW ENGLAND WEST ACROSS THE GREAT LAKES AND INTO MINNESOTA. WESTERN PORTION OF A WEST-EAST ORIENTED SHEARED UPPER TROUGH AXIS ACROSS THE REGION IS PROGGED TO AMPLIFY/CLOSE OFF ACROSS THE UPPER MIDWEST LATER TODAY AND TONIGHT IN RESPONSE TO MID-LEVEL JET ENERGY ROTATING AROUND THE SOUTHERN PERIPHERY OF THIS FEATURE AND INTO THE MIDWEST TONIGHT. GUIDANCE DEVELOPS A BAND OF PRECIPITATION ALONG THE BAROCLINIC ZONE ASSOCIATED WITH TODAYS COLD FRONT. THOUGH SHOULD BE ABLE TO PRODUCE SNOW DURING THE DIURNAL NIGHT/EARLY MORNING COOLER HOURS WITH RAIN OR RAIN/SNOW MIX DURING THE DAY.
A RIDGE BUILDS IN FROM THE WEST FOR LOVELY SPRING WEATHER AND A WARMING TREND.
A strong cold front will move across the terminals today, with FROPA at KABI around noon, KSJT by 20Z and the southern terminals by 22Z. /issued 432 AM CDT FRI MAR 18 2016/ (Today and Tonight) A strong cold front will move south across the area today, with showers and a few strong to severe storms possible through this evening. A much colder airmass will filter into the area tonight, with overnight lows ranging from the mid and upper 30s north, to the lower 40s along the I-10 corridor.
MID LEVEL SHEAR AXIS AND ASSOCIATED SURFACE INVERTED TROUGH ROUGHLY BISECTING THE FA FROM SE-NW WILL SAG SLOWLY SOUTH NEXT 24 HOURS. WEAK IMPULSES PROPAGATING WESTWARD ALONG TROUGH WILL CONTINUE TO AID IN BRINGING PERIODS OF LIGHT SNOW TO THE REGION. GENERALLY IN THE LOW-MID 30S. LONG WAVE RIDGE OVER WESTERN NORTH AMERICA DE-AMPLIFIES AND RETROGRADES A BIT TO THE COAST. LONG WAVE TROUGH OVER EASTERN CANADA ALSO RETROGRADES A BIT AS SHORT WAVES MOVE SOUTH OUT OF NORTHERN CANADA. EXPECT CONDITIONS TO REMAIN PRETTY AS IS TODAY AS DRIER AIR FILTERING SOUTHWARD KEEPS NORTHERN AREAS VFR AND MID LEVEL TROUGH KEEPING MVFR CIGS/VSBY ACROSS THE SOUTH.
A TROUGH EXTENDED FROM THE GREAT LAKES REGION BACK INTO THE NORTHERN PLAINS. AND AN ANTICYCLONE WAS LOCATED OVER CENTRAL MANITOBA. A COOLER AIRMASS WILL BE SINKING SOUTH ACROSS OUR AREA.
1259 PM EDT FRI MAR 18 2016 HYDRO A WEAK WAVE OF LOW PRESSURE WILL BE OVER THE AREA TODAY. COOLER AIR WILL BE THE RULE THROUGH THE WEEKEND. THIS PCPN IS ASSOCIATED WITH A UPPER TROUGH DROPPING SOUTH INTO THE AREA. DRY AIR IN THE LOWER LEVELS AND LIMITED MOISTURE OVERALL HAS LIMITED THE PCPN THAT MAKES IT TO THE GROUND. WE WILL SEE THE ORIENTATION OF THE TROUGH/WEAK FRONT SHIFT TO BE MORE NW TO SE BY AFTERNOON. SOME SNOW WILL BE POSSIBLE ACROSS THE N AND NW SECTIONS OF THE AREA WHERE COOLER AIR WILL EXIST. AND A TROUGH TO OUR EAST. AND ALMOST SOME UPPER RIDGING WILL SQUASH PCPN CHCS TO ALMOST ZERO.
HIGH PRESSURE WILL REMAIN OVER THE REGION WITH MOSTLY CLEAR SKIES AND LIGHT WINDS. LOW TEMPERATURES OVERNIGHT WILL AGAIN DROP BELOW FREEZING IN MANY AREAS SO THOSE WITH SENSITIVE PLANTS SHOULD TAKE PRECAUTIONS.
620 AM CDT FRI MAR 18 2016 A COLD FRONT HAS BROUGHT GUSTY NORTH WINDS AND LOWER CEILINGS INTO OKLAHOMA THIS MORNING. /ISSUED 253 AM CDT FRI MAR 18 2016/ THE FRONT THAT IS STEADILY MOVING THROUGH OKLAHOMA THIS MORNING WILL BRING COOLER AND CLOUDY WEATHER TODAY. AN UPPER TROUGH ARRIVING FROM SOUTHEAST COLORADO WILL AUGMENT LIFT NEAR AND NORTH OF THE FRONT TO BRING RAIN AND SOME THUNDERSTORMS TO SOUTHERN OKLAHOMA TODAY. THE COOLER AIRMASS LASTS THROUGH THE WEEKEND AND PREVIOUSLY PROMPTED A FREEZE WATCH FOR THE NORTHERN THIRD OF OKLAHOMA FOR SATURDAY MORNING.
738 AM EDT FRI MAR 18 2016 AVIATION A WEAK WAVE OF LOW PRESSURE WILL BE OVER THE AREA TODAY. COOLER AIR WILL BE THE RULE THROUGH THE WEEKEND. THIS PCPN IS ASSOCIATED WITH A UPPER TROUGH DROPPING SOUTH INTO THE AREA. DRY AIR IN THE LOWER LEVELS AND LIMITED MOISTURE OVERALL HAS LIMITED THE PCPN THAT MAKES IT TO THE GROUND. WE WILL SEE THE ORIENTATION OF THE TROUGH/WEAK FRONT SHIFT TO BE MORE NW TO SE BY AFTERNOON. SOME SNOW WILL BE POSSIBLE ACROSS THE N AND NW SECTIONS OF THE AREA WHERE COOLER AIR WILL EXIST. AND A TROUGH TO OUR EAST. AND ALMOST SOME UPPER RIDGING WILL SQUASH PCPN CHCS TO ALMOST ZERO.
739 AM EDT FRI MAR 18 2016 RAIN AND SNOW SHOWERS WILL MOVE SOUTHEAST ACROSS THE AREA THIS MORNING AS A COLD FRONT DROPS SOUTH OUT OF CANADA.
1035 AM EDT FRI MAR 18 2016 A WEAK COLD FRONT WILL SAG SOUTH ACROSS THE REGION TODAY. LOW PRESSURE TRACKING WELL SOUTH OF THE AREA ON SATURDAY WILL SPREAD PRECIPITATION ACROSS THE REGION. A WEAK COLD FRONT WILL DROP SOUTH THROUGH THE DAY. UPPER LOW OVER THE UPPER MISSISSIPPI VALLEY WILL PUSH SOUTHEAST INTO THE OHIO VALLEY THROUGH THE WEEKEND. BUT AN INVERTED TROUGH NORTH OF THE LOW WILL REACH INTO THE AREA. REINFORCING ENERGY DROPPING INTO THE MEAN TROUGH POSITION WILL STALL THE EASTWARD PROGRESSION OF THE ENTIRE SYSTEM.
1000 AM CDT FRI MAR 18 2016 WARM FRONT CURRENTLY LOCATED JUST INLAND ALONG THE LA AND SE TX GULF COAST FORECAST TO MOVE N AND INLAND THROUGH THIS AFTERNOON AND EVENING.
615 AM CDT FRI MAR 18 2016 A BROAD UPPER LEVEL TROUGH AT 500 MB WILL CONTINUE IMPACTING THE REGION THROUGH THE FIRST HALF OF THE WEEKEND.
ATLANTIC HIGH PRESSURE WILL RIDGE ACROSS SOUTHERN FL INTO THE GULF TODAY AS A NEARLY STATIONARY FRONTAL BOUNDARY ALONG THE AL/GA/FL LINE EASES SOUTHWARD. HIGH PRESSURE RIDGING IN ACROSS THE WATERS WILL PROVIDE SOUTHEAST TO SOUTHWEST WINDS AT 10 KNOTS OR LESS.
712 AM CDT FRI MAR 18 2016 AN UPPER LEVEL LOW IS MOVING ACROSS THE NORTHERN PLAINS THIS MORNING. THIS HAS ALLOWED A LITTLE COOLER AIR TO BE DRAWN INTO THE AREA. BY AFTERNOON COOLER AIR SETTLES ACROSS THE AREA WITH GUIDANCE FOLLOWED KEEPING TEMPS IN THE 30S AND 40S. THE PERSISTENT NEARLY CUT OFF UPPER LEVEL LOW ACROSS THE NORTHERN PLAINS WILL DRIFT SOUTH INTO NORTHERN IOWA SATURDAY.
COLD FRONT WILL PASS THROUGH LATE TODAY/EARLY TONIGHT.
THE HIGH RISK CONTINUES FOR THE PALM BEACHES, BUT THE BROWARD AND DADE BEACHES DO NOT HAVE THE SWELL AS HIGH AS THE PALM BEACHES DO.
A STRONG COLD FRONT WILL MOVE SOUTH AND THIS AFTERNOON AND THROUGH THE REGION THIS EVENING. SHOWERS BECOME MORE WIDESPREAD WITH THUNDERSTORMS DEVELOPING ALONG THE COLD FRONT AND OVER THE SERRANIAS DEL BURRO MOUNTAINS WEST OF THE RIO GRANDE. SUBSIDENCE ALONG WITH A COOLER AND DRIER AIRMASS SPREADING INTO SOUTH CENTRAL TEXAS END THE SHOWERS AND THUNDERSTORMS FROM NORTH TO SOUTH OVERNIGHT INTO EARLY SATURDAY MORNING.
/ISSUED 411 AM CDT FRI MAR 18 2016/ Cold front nearing I-44 early this morning will continue to push south to the Red River by early this afternoon, ushering in below normal temps for the first time this month. This will ultimately result in clearing skies tonight, especially northern areas where temps likely to fall near or a few degrees below freezing.
AN UPPER TROF AND ASSOCIATED SFC COLD FRONT WAS PRODUCING SCT RAIN/SNOW SHOWERS OVER OUR SOUTHERN TIER OF COUNTIES EARLY THIS MORNING. A SECONDARY SFC TROF WAS ALSO SITUATED FROM THE WI/UPPER MI BORDER INTO NORTHERN LOWER MI. AND WAS HELPING TO PRODUCE SOME PATCHY LIGHT FLURRIES OR FREEZING DRIZZLE OVER NC WI. AN UPPER LOW WILL MOVE ALONG THE MN/IA BORDER THIS AFTERNOON AND TONIGHT. WITH A S/W TROF ROTATING AROUND THE LOW INTO CENTRAL WI. THE UPPER LOW IS EXPECTED TO TRACK SOUTHWEST OF THE REGION ON SATURDAY. AND LOWS TONIGHT RANGING FROM 10 TO 15 IN THE FAR NORTH TO THE LOW TO MID 20S SOUTH.
A BROAD UPPER LEVEL TROUGH AT 500 MB WILL CONTINUE IMPACTING THE REGION THROUGH THE FIRST HALF OF THE WEEKEND.
PERIODIC VFR CEILINGS AND VCSH JUST DOWNSTREAM OF AN APPROACHING COLD FRONTAL BOUNDARY. BUT BETTER CHANCES ARE ANTICIPATED TONIGHT ALONG AND AHEAD OF A COLD FRONT THAT WILL SWEEP THROUGH THE AREA. IT WILL TURN BREEZY AND COOLER BEHIND THE FRONT WITH WIND ADVISORIES POSSIBLE MAINLY ACROSS THE COASTAL COUNTIES STARTING LATE TONIGHT AND CONTINUING THROUGH THE DAY ON SATURDAY.
06Z SFC DATA HAS A COLD FRONT RUNNING FROM LOWER MICHIGAN INTO NORTHERN OKLAHOMA. ANOTHER COLD FRONT RAN FROM LAKE HURON BACK INTO CENTRAL MINNESOTA. LATE THIS EVENING AS THE NEXT COLD FRONT MOVES INTO THE AREA THERE IS SOME WEAK FORCING TO ACT ON WHAT MOISTURE IS PRESENT.
A COLD FRONT WAS SLOWLY MOVING SOUTHWARD THROUGH N TEXAS. THE HIGH RESOLUTION MODELS DIFFER QUITE A BIT ON COVERAGE LATER THIS AFTERNOON AND THIS EVENING.
1021 AM CDT FRI MAR 18 2016 Stronger push of cooler air making its way into northeast Oklahoma this morning as gusty northeast winds have ensued.
VEERING LOW-LEVEL WINDS SHOULD KEEP THE LOW CLOUDS AND FOG CONFINED TO SOUTHERN AND EASTERN AREAS.
SHOWERS WILL DIMINISH THIS MORNING AS THE LOW PRESSURE SYSTEM SHIFTS EAST.
QUAZI-ZONAL FLOW ALOFT IS CURRENTLY IN PLACE ACROSS DEEP SOUTH TEXAS BETWEEN UPPER TROUGHING OVER THE GREAT BASIN AND UPPER RIDGING OVER SOUTHERN MEXICO. IN THE LOW LEVELS. THIS WILL CAUSE HIGH TEMPERATURES TO RISE EVEN HIGHER ABOVE NORMAL VALUES THAN WHAT WILL BE SEEN TODAY AS THE LOW LEVEL SOUTHERLY FLOW PERSISTS.
540 AM EST WED NOV 25 2015 STRONG HIGH PRESSURE OVER THE REGION WILL SLOWLY MOVE EAST OF THE AREA THROUGH THANKSGIVING DAY.
FLOW ALOFT WILL BECOME SWLY BY THURSDAY MORNING AS A LARGE UPPER TROUGH BECOMES CUT OFF OVER THE GREAT BASIN AND AN UPPER RIDGE BUILDS NORTH OF THE LOW OVER BRITISH COLUMBIA CREATING A HIGH-OVER-LOW BLOCK.
WE HAVE GOTTEN ONE REPORT OF SOME FREEZING DRIZZLE NEAR FARGO THAT HAS ENDED. CAN/T RULE OUT SOME DRIZZLE/FREEZING DRIZZLE IN THE SOUTH THROUGH MID AFTERNOON WHERE TEMPS ARE NEAR FREEZING. NORTHERN STREAM SYSTEM PROPAGATING ACROSS SOUTHERN CANADA WILL SEND A COLD FRONT THROUGH THE REGION. ESPECIALLY HOW QUICKLY THE LOW CLOUDS ARE ABLE TO CLEAR.
933 AM EST WED NOV 25 2015 THE NEAR TERM SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE ACROSS THE SOUTHEASTERN STATES WILL CONTINUE TO DOMINATE INDIANA/S WEATHER TODAY THROUGH THURSDAY. A COLD FRONT WILL APPROACH THE AREA BY THURSDAY EVENING.
652 AM EST WED NOV 25 2015 HIGH PRESSURE CENTERED OVER NEW ENGLAND WILL PROVIDE DRY WEATHER INTO WEDNESDAY EVENING. HIGHS TODAY WILL PRIMARILY BE IN THE LOWER TO MIDDLE 50S. LOW LEVEL WAA THROUGH THE PERIOD/INITIALLY WEAK BUT WITH NEAR FULL INSOLATION FAVOR CURRENT FCST/WARMER MAV/EC GUIDANCE. BELIEVE LARGE SCALE/PERSISTENT MID TROP HEIGHT RISES ACROSS SOUTHERN GREAT LAKES AS NEVADA CUTOFF BECOMES REXED LENDS AMPLIFICATION OF RIDGE FROM GOMEX INTO MID ATL. IN ADDITION TO ANTECEDENT DRY SUBCLOUD LAYER POINT TO MUTED/INITIAL RESPONSE UNTIL GREATER NORTHERN STREAM WAVE INFLUENCE AND ARRIVAL OF RICHER LLVL THETA-E RIDGING INTO CWA AWAITS FOR DYS2-3.
A COLD FRONT WILL PUSH SOUTH ACROSS THE REGION TODAY.
330 AM PST WED NOV 25 2015 A COLD UPPER LOW WILL BRING BELOW NORMAL TEMPERATURES.
A COLD UPPER LOW WILL SETTLE INTO THE GREAT BASIN TODAY. THIS LOW WILL CONTINUE TO IMPACT THE AREA THROUGH THE THANKSGIVING WEEKEND.
AT THE SURFACE AND IN THE LOWER TO MID LEVELS. AN IMPRESSIVE 8 MB PRESSURE GRADIENT DIFFERENCE EXISTS BETWEEN JACKSONVILLE AND KEY WEST AT THE SOUTHERN PERIPHERY OF THIS ANTICYCLONE. DESPITE THE COOLER WATERS IN FLORIDA BAY.
420 AM CST WED NOV 25 2015 A DEEP LONGWAVE TROUGH OVER THE WESTERN CONUS WILL INDUCE AN ANOMALOUS DOWNSTREAM RIDGE OVER THE CENTRAL GULF COAST REGION AS WE MOVE INTO LATTER PORTIONS OF THE WEEK. HIGH TEMPERATURES WILL BE WARMER THAN RECENTLY OBSERVED. BUT THE WARMTH SHOULD BE TEMPERED SOME BY INCREASING STRATOCUMULUS COVERAGE AND ESE FLOW EMANATING FROM A SLIGHTLY COOLER AIRMASS WEDGING AROUND THE SOUTHERN APPALACHIANS. BUT A FEW COOLER ESPECIALLY OVER EAST CENTRAL MS.
Otherwise, expect cloudy, mild and breezy conditions today with highs in the lower 70s, becoming partly cloudy briefly this afternoon. The southwest flow aloft will continue today and tonight in advance of an upper low diving south across California.
THE EXCEPTION WILL BE HIGH PRESSURE ALONG THE EASTERN SEABOARD WILL INCREASE LOW LEVEL MOISTURE AND CLOUD COVER FOR TODAY AND THURSDAY. IT IS NOT OUT OF THE QUESTION THAT PATCHY DRIZZLE COULD DEVELOP LATE TONIGHT INTO THURSDAY IF THE LOWER CLOUDS ARE DEEP ENOUGH. BUILDING AN UPPER RIDGE ACROSS THE SOUTHEAST.
719 AM EST WED NOV 25 2015 HIGH PRESSURE OVERHEAD WILL SHIFT OFFSHORE TODAY AS A BROAD UPPER LEVEL RIDGE BUILDS OVER NEW ENGLAND.
LARGE HIGH PRESSURE TO THE EAST OF THE REGION WILL SUSTAIN AMPLE DRY AIR TODAY. TODAY AND TONIGHT AN AIRMASS CHANGE IS NOW IN PROGRESS ACROSS SE MI AS A 925MB WARM FRONT ADVANCES ITS WAY NORTHWARD ACROSS LOWER MI. UPPER LEVEL LOW OVER FAR NORTHERN CALIFORNIA EARLY THIS MORNING.
LIGHT SNOW WILL BE POSSIBLE IN THE HIGHEST PEAKS ACROSS THE REGION TONIGHT INTO WEDNESDAY MORNING. ALONG WITH CONTINUE COOLER THAN AVERAGE TEMPERATURES THAT WILL PERSIST INTO THE UPCOMING WEEKEND.
TROUGH AXIS EXTENDING NE THROUGH MT INTO CENTRAL CANADA GRADUALLY SHIFTS EAST AS THE PARENT UPPER LEVEL TROUGH PROGRESSES EAST ACROSS CANADA, LEAVING A DEFORMATION AXIS TO SAG SOUTH THROUGH SW MT TONIGHT AS THE GREAT BASIN CIRCULATION SEPARATES FROM THE NORTHERN STREAM FLOW ALOFT.
Upper ridging will build across the CWA today while high pressure remains in place down the east coast.
902 AM EST WED NOV 25 2015 HIGH PRESSURE OVER PENNSYLVANIA WILL HOLD ON ALONG THE EAST COAST INTO LATE WEEK.
657 AM EST WED NOV 25 2015 HIGH PRESSURE OVER PENNSYLVANIA WILL HOLD ON ALONG THE EAST COAST INTO LATE WEEK.
ONSHORE FLOW WILL STRENGTHEN TODAY THROUGH THURSDAY AS LOW PRESSURE DEVELOPS ACROSS THE SOUTHERN HIGH PLAINS. BROAD RIDGING IN THE MIDLEVELS REMAINS ACROSS THE WESTERN GULF WITH WARMING FROM H85-H7 OVER SOUTH TEXAS. TEMPERATURES WILL GRADUALLY WARM INTO THE LOWER 80S BY THURSDAY.
A COLD FRONT STEMMING FROM A DEEP LOW PRESSURE SYSTEM OVER NEVADA WILL PRODUCE GUSTY SOUTHWEST WINDS OVER THE NEXT FEW DAYS. THE STRONGEST WINDS ARE FORECAST TODAY AS THE COLD FRONT PUSHES EAST ACROSS NORTHERN ARIZONA. A DEEP UPPER LOW SETTLING INTO THE GREAT BASIN WILL BRING WINDY AND COOLER CONDITIONS TO THE AREA TODAY. A COLD FRONT WILL MOVE FROM NORTHWEST TO SOUTHEAST LATER TODAY AND WILL PUSH TOWARD THE NEW MEXICO BORDER BY TONIGHT. THE UPPER LOW WILL SPIN OVER THE SOUTHWEST THROUGH THE WEEKEND WITH A FEW S/WVS EJECTING THROUGH NORTHERN ARIZONA FROM TIME TO TIME.
Center of closed upper low is now over northwest Nevada early this morning. Skies have cleared across a large part of the Sacramento Valley and Coast Range and temperatures in the North Valley have dipped into the lower to mid 30s. The low will edge slowly into central Nevada today with northerly flow over NorCal. Flurries will likely continue across the higher elevations of the northern Sierra while freeze risk will remain a concern for the Central Valley during the late night and early morning hours.
ISOLATED/WIDELY SCATTERED STREAMER SHOWERS ARE IN PLACE OVER PORTIONS OF THE LOWER/MID RIO GRANDE VALLEY EARLY THIS MORNING. QUAZI-ZONAL FLOW ALOFT IS CURRENTLY IN PLACE ACROSS DEEP SOUTH TEXAS BETWEEN UPPER TROUGHING OVER THE GREAT BASIN AND UPPER RIDGING OVER SOUTHERN MEXICO. IN THE LOW LEVELS. THIS WILL CAUSE HIGH TEMPERATURES TO RISE EVEN HIGHER ABOVE NORMAL VALUES THAN WHAT WILL BE SEEN TODAY AS THE LOW LEVEL SOUTHERLY FLOW PERSISTS.
806 AM EST WED NOV 25 2015 DRY WEATHER AND WARMER TEMPERATURES CAN BE EXPECTED THROUGH THE WEEK.
501 AM PST WED NOV 25 2015 SOME LINGERING RAIN AND SNOW BEHIND A COLD FRONTAL SYSTEM THAT MOVED THROUGH THE AREA MAY CAUSE SOME TRAVEL HEADACHES FOR HOLIDAY TRAVELERS TODAY.
913 AM EST WED NOV 25 2015 KTBW 12Z SOUNDING IS SHOWING THE LOW LEVEL MOISTENING TREND CONTINUING THIS MORNING. HIGH PRESSURE WILL HOLD NORTH OF THE COASTAL WATERS THROUGH THE UPCOMING WEEKEND.
634 AM EST WED NOV 25 2015 HIGH PRESSURE EXTENDING FROM THE ATLANTIC OCEAN TO THE EASTERN UNITED STATES WILL KEEP DRY WEATHER AND ABOVE NORMAL TEMPERATURES OVER THE OHIO VALLEY TODAY THROUGH THURSDAY.
524 AM CST WED NOV 25 2015 The CWA is in between the high pressure to the east and the developing weather system in the plains. In this position, breezy southerly winds and warmer temperatures are to be expected today.
BRINGING COOLER TEMPERATURES. AND A SLIGHT CHANCE FOR SHOWERS OVER THE HIGHER TERRAIN EAST OF PHOENIX. AND WITH THEIR RESPECTIVE LAST FEW RUNS ON THE OVERALL FORECAST DETAILS CONCERNING AN UPPER LOW THAT IS NOW MOVING EASTWARD INTO NW NV. ALL THE MODELS CONTINUE TO TAKE THIS LOW CENTER SLOWLY EASTWARD INTO NW UT BY MIDDAY THU. THE ASSOCIATED SFC COLD FRONT. ONLY SOME ISOLATED SHOWERS CAN BE EXPECTED OVER THE HIGHER TERRAIN EAST OF PHOENIX. WITH HIGHS ACROSS THE LOW DESERTS MAINLY IN THE MID-60 TO LOWER-70 RANGE DURING THIS PERIOD. WITH UPPER-LEVEL TROFING OVER THE GREAT BASIN/CENTRAL ROCKIES VERY SLOWLY PROGRESSING OFF TO THE EAST.
Snow showers linger this morning from McCall Idaho to Butte Montana as moisture continues to move in from the south in advance of a potent upper-level low pressure system now centered over northwest Nevada.
940 AM EST WED NOV 25 2015 HIGH PRESSURE EXTENDING FROM THE ATLANTIC OCEAN TO THE EASTERN UNITED STATES WILL KEEP DRY WEATHER AND ABOVE NORMAL TEMPERATURES OVER THE OHIO VALLEY TODAY THROUGH THURSDAY.
919 AM EST WED NOV 25 2015 CURRENT PATTERN WITH HIGH PRESSURE TO THE NORTH AND ONSHORE FLOW WILL CONTINUE TODAY.
1026 AM EST WED NOV 25 2015 HIGH PRESSURE OVERHEAD WILL SHIFT OFFSHORE TODAY AS A BROAD UPPER LEVEL RIDGE BUILDS OVER NEW ENGLAND.
with ridging over the northeast Pacific nosing well up into AK. Downstream from the ridge. embedded within a larger scale positive tilt longwave trough. Shallow cold air will wedge its way south as a strong cold front.
610 AM EST WED NOV 25 2015 HIGH PRESSURE OVER PENNSYLVANIA WILL HOLD ON ALONG THE EAST COAST INTO LATE WEEK.
944 AM EST WED NOV 25 2015 STRONG HIGH PRESSURE OVER THE REGION WILL SLOWLY MOVE EAST OF THE AREA THROUGH THANKSGIVING DAY.
Low pressure has become stacked over the Great Lakes, with the upper low starting to elongate from west to east.
RIDGE OF HIGH PRESSURE OFF THE COAST WILL KEEP US IN A DRY YET COOL NORTHWESTERLY FLOW TODAY AND OVERNIGHT.
RADIATIONAL COOLING HAS ALLOWED FOR TEMPS TO FALL INTO THE TEENS THANKS TO DEW POINTS IN THE LOWER TEENS AND EVEN SOME SINGLE DIGITS. SLOW MOVING AND PERSISTENT UPPER LEVEL LOW PRESSURE SYSTEM WILL BE CENTERED OVER EASTERN SOUTH DAKOTA/SOUTHWEST MINNESOTA REGION FRIDAY. CHILLY AIR WILL BE FILTERING INTO THE AREA THANKS TO THE UPPER LOW. AND HIGHS ONLY EXPECTED IN THE LOWER TO MID 40S MOST PLACES.
THE BROAD NW FLOW ALOFT CONTINUES TO DOMINATE THE WEATHER PATTERN BUT THE UPPER RIDGE AXIS WILL SHIFT ANOTHER 100 MILES EASTWARD TOWARDS THE COAST TODAY.
BEGINNING THE PROCESS OF DEEPENING A TROUGH OVER THE CENTRAL AND EASTERN CONUS. THE LATEST MODEL GUIDANCE AGREES THAT A LARGER SCALE TROUGH OF LOW PRESSURE ALOFT WILL DIVE OUT OF THE NORTHERN PLAINS AND ACROSS THE OHIO VALLEY AND GREAT LAKES REGIONS OVER THE WEEKEND.
A WEAK COLD FRONT THIS EARLY EVENING WITH JET SUPPORT INCREASING OVERNIGHT IN COLD ADVECTION.
WITH HIGHER MOISTURE OVER THE SLIGHTLY COOLER NEARSHORE WATERS. A WEAK COASTAL TROUGH THIS MORNING WILL ALLOW FOR ISOLATED TO SCATTERED SHOWERS TO DEVELOP THIS MORNING. FRIDAY A COLD FRONT WILL MOVE SOUTH ACROSS CENTRAL TEXAS AND APPROACH THE REGION. AT THE SAME TIME MORE DISTURBANCES MOVE ACROSS THE REGION AHEAD OF APPROACHING UPPER LVL TROUGH/LOW. AFTERNOON TEMPERATURES WILL STAY IN THE LOW 80S TODAY. LOWS TONIGHT WILL BE A FEW DEGREES COOLER.
AN ELONGATED UPPER LOW WAS SITUATED ALONG THE WI/UPPER MI BORDER THIS MORNING. TEMPERATURES HAVE REMAINED A BIT WARMER THAN FCST. THE UPPER LOW IS EXPECTED TO WEAKEN INTO AN OPEN TROF AND SAG SOUTH THROUGH THE FCST AREA TODAY AND TONIGHT. A WEAK COLD FRONT WILL ALSO ACCOMPANY THIS FEATURE. AS THE UPPER TROF AND COLD FRONT SAG SOUTH. AS A HUDSON BAY HIGH PRESSURE SYSTEM FEEDS CANADIAN AIR INTO THE REGION.
A COLD FRONT WILL MOVE THROUGH THE REGION ON FRIDAY. ACTIVITY IS ASSOCIATED WITH A MID LEVEL DISTURBANCE AND IS WORKING ITS WAY EAST ON THE NORTH SIDE OF A WARM FRONT. THE FRONT APPEARED TO EXTEND ALONG A LINE FROM BRECKENRIDGE TO PALESTINE DURING THE PAST FEW HOURS. THERE WILL LIKELY BE A TRANSITION FROM THE ELEVATED STORMS NORTH OF THE I-20 REGION TO SURFACE BASED CONVECTION SOUTH OF THE WARM FRONT THIS AFTERNOON. THE WARMER AIRMASS SOUTH OF THE BOUNDARY WILL KEEP LOW TEMPERATURES IN THE 60S ACROSS THE SOUTHERN COUNTIES OVERNIGHT. LOWS TONIGHT WILL BE ABOUT 10 DEGREES OR SO COOLER ON THE NORTH SIDE OF THE FRONT. THIS WILL SEND A COLD FRONT SOUTH THROUGH THE REGION FRIDAY.
However, other showers and storms remain possible, especially as a weak cold front pushes into West Central Texas. Abundant cloud cover today, with low clouds surging north as the low level moisture increases. Highs in the upper 60s north of the weak front, warming to the low to mid 70s along the I-10 corridor.