Aikyam-Lab/Synoptic-Bench huggingface dataset:
850 PM EDT THU OCT 29 2015 A WEAK COLD FRONT IS ENTERING FAR INLAND SE GA THIS EVENING PRODUCING ISOLATED TO WIDELY SCATTERED SHOWERS. LATEST TRENDS FROM THE HIGH RES ENSEMBLE SHOWS THE GREATEST RISK ACROSS INTERIOR NE FL FURTHEST AWAY FROM ANY WEAK LIFT ALONG THE FRONTAL BOUNDARY. CIGS BETWEEN 6 AND 10 KFT WITH A BAND OF SHOWERS MOVING INTO SE GA AHEAD OF COLD FRONT EARLY THIS EVENING. S/SW WINDS 10-15 KT THIS EVENING WILL BECOME NW OVERNIGHT AS A WEAK COLD FRONT CROSSES THE WATERS.
AN APPROACHING COLD FRONT WILL REINFORCE THE ALREADY DRY SFC AIRMASS OVER THE NEXT 6 HOURS. W FLOW WILL SHIFT TO THE NW WITH A COLD FRONT PASSAGE EXPECTED ~03-04Z. FLOW WILL TURN N-NELY ON FRIDAY AS HIGH PRESSURE BUILDS INTO THE OH VALLEY.
719 PM EDT THU OCT 29 2015 LOW PRESSURE OVER EASTERN CANADA WILL RESULT IN A COOL WESTERLY FLOW OF AIR ACROSS THE AREA TONIGHT INTO FRIDAY. SCATTERED LIGHT SHOWERS OR SPRINKLES COULD ACCOMPANY A WEAK PRESSURE TROUGH EARLY FRIDAY.
640 PM CDT THU OCT 29 2015 WINDS WILL SHIFT AND BECOME SOUTHERLY OVERNIGHT AS AN AREA OF HIGH PRESSURE ACROSS CENTRAL KANSAS CONTINUES TO TRACK SOUTHEAST AND SOUTHERLY RETURN FLOW IS REALIZED ACROSS THE LOCAL AREA. EXPECT OVERNIGHT TEMPERATURES TO BE MODERATED SOME BY THIS WARMER/STEADY SOUTHERLY FLOW. WHILE A FEW SUBFREEZING TEMPERATURES CANNOT BE COMPLETELY RULED OUT. MOST AREAS SHOULD BE 5-7 DEGREES ABOVE THIS MORNINGS SUB-FREEZING LOWS. THE MAIN UPPER LEVEL LOW WILL THEN PASS ACROSS THE AREA LATE TOMORROW NIGHT BRINGING ADDITIONAL CHANCES FOR RAINFALL.
/ISSUED 316 PM CDT THU OCT 29 2015/ LOW LEVEL EASTERLY WINDS HAVE SPREAD ACROSS THE PANHANDLES BEHIND ANOTHER COLD FRONT WHICH MOVED THROUGH EARLIER. AT THIS POINT THIS UPPER STORM SYSTEM WILL COME AT US IN PIECES AS THE MAIN UPPER LEVEL POSITIVELY TILTED TROUGH DRAGS ACROSS THE SOUTHWEST U.
1151 PM CDT THU OCT 29 2015 LONG WAVE TROUGH ACROSS THE WESTERN CONUS THIS AFTERNOON WILL TRANSLATE EAST INTO THE CENTRAL AND SOUTHERN PLAINS FRIDAY. AND WITH DRY AIR REMAINING IN THE LOWER LEVELS. AND AS THE LOWER LEVELS SATURATE.
640 PM CDT THU OCT 29 2015 HIGH PRESSURE OVER THE EASTERN DAKOTAS WILL MOVE EAST TONIGHT AS A TROUGH OF LOW PRESSURE MOVES INTO WESTERN NORTH DAKOTA EARLY FRIDAY MORNING. BY FRIDAY MORNING THE STRATUS SHOULD BE GONE BUT ALREADY ADVANCING MID LEVEL CLOUDS FROM AN H500 TROUGH WILL BRING SOME CLOUD COVER BACK ACROSS THE REGION PROBABLY SHORTLY AFTER MIDNIGHT TONIGHT. UPPER 20S TO THE LOWER 30S.
1153 PM CDT THU OCT 29 2015 UPPER LEVEL LOW WILL CONTINUE TO PULL EAST THROUGHOUT THE OVERNIGHT PERIOD. LARGE STRETCH OF STRATUS ASSOCIATED WITH LOW WILL ALSO LIFT OUT AS HIGH PRESSURE DROPS SOUTH THROUGH MISSOURI. HAVE THEREFORE KEPT TEMPS A BIT WARMER ACROSS THE NORTHEAST. AND HAVE THEREFORE KEPT TEMPS A BIT WARMER IN THE WEST.
735 PM EDT THU OCT 29 2015 STRONG LOW PRESSURE OVER QUEBEC WILL QUICKLY PULL AWAY TO THE NORTHEAST TONIGHT. A LARGE AREA OF HIGH PRESSURE OVER THE PLAINS WILL BUILD EAST ACROSS THE AREA ON FRIDAY.
THE COMBINATION OF AN APPROACHING WARM FRONT, INCREASING MOISTURE, AND AN UPPER LEVEL DISTURBANCE WILL PRODUCE A FEW SHOWERS DEVELOPING FROM THE WEST FRIDAY AFTERNOON. THE INCREASE IN CLOUD COVER/MOISTURE WILL RESULT IN MUCH WARMER TEMPS TONIGHT MAINLY OVER THE WRN PORTIONS OF THE FORECAST AREA. AN APPROACHING WARM FRONT ON FRIDAY WILL BRING INCREASING CLOUDS AND A FEW SHOWERS IN THE VICINITY AROUND BPT AND LCH DURING THE AFTERNOON. AS A LOW PRESSURE AREA IS GETTING ORGANIZED IN WEST TEXAS LATER TONIGHT AND FRIDAY.
907 PM EDT THU OCT 29 2015 THE TROUGH THAT HAS BEEN JUST NORTHWEST OF THE KEYS IS FINALLY WEAKENING BEYOND RECOGNITION. BUT THE LOW LEVEL MOISTURE IS LESS ABUNDANT. WITH THE LOWER LOW LEVEL MOISTURE IN THE SOUNDING WE WILL LOWER RAIN CHANCES TO SLIGHT CHANCE OVERNIGHT. AN AREA OF HIGH PRESSURE OVER THE MISSISSIPPI VALLEY WILL ADVANCE ON THE EAST COAST STATES THROUGH FRIDAY.
MESA WINDS ARE BACKING FROM S TO E INDICATING THE COLD FRONT IS IN THE VICINITY. THE LATEST LOW PRESSURE TROUGH HAS MOVED OVER UT TODAY AS ENERGY SPLITS INTO AZ OVERNIGHT. THE TROUGH AXIS WILL BE OVER THE CO/UT BORDER SOUTHWARD TO THE FAR SOUTHEAST CORNER OF AZ. THE UPPER TROUGH AXIS INITIALLY OVER OUR CWA WILL MOVE SLOWLY EASTWARD AND INTO EASTERN UTAH BY LATE AFTERNOON.
741 PM EDT TUE JUL 21 2015 AVIATION HIGH PRESSURE WILL BUILD IN AND PRODUCE FAIR WEATHER MID TO LATE WEEK.
1027 PM EDT TUE JUL 21 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE IS EXPECTED ACROSS THE AREA THROUGH THE END OF THE WEEK. SURFACE ANALYSIS THIS EVENING SHOWS A BROAD AREA OF HIGH PRESSURE IN PLACE OVER INDIANA AND THE UPPER MIDWEST. COOLER AND DRIER NORTHERLY FLOW WAS IN PLACE ACROSS THE FORECAST AREA. HAVE TRENDED LOWS OVERNIGHT SLIGHTLY COOLER THAN THE PREVIOUS FORECAST WITH DRY AIR IN PLACE AND GOOD RADIATIONAL COOLING IN PLACE. INCREASED SKY GRIDS ACROSS THE SOUTHERN PARTS OF THE FORECAST AREA TO ACCOUNT FOR THE HIGH CLOUD DRIFTING ACROSS THE SOUTHERN PARTS OF THE FORECAST AREA. MODEL DATA SUGGEST UPPER HEIGHTS WILL BEGIN TO RISE DURING THIS PERIOD AS UPPER TROUGH OVER THE GREAT LAKES WILL LIFT OFF INTO NEW ENGLAND ON WEDNESDAY. AND SOUTHERN PLAINS RIDGE EXPANDS INTO THE MIDWEST.
/ISSUED 500 PM CDT TUE JUL 21 2015/ ANOTHER TYPICAL SOUTHERN LOUISIANA/ SOUTHEAST TEXAS SUMMER DAY AS TEMPERATURES CLIMBED INTO THE LOW TO MID 90S WITH THE HEAT INDICES AT 103 TO 107 DEGREES. PLENTY OF WATER IN THE ATMOSPHERE BUT THE RIDGE ALOFT IS KEEPING PRECIP DEVELOPMENT TO ONLY A FEW STORMS. THIS RIDGE WILL HOLD ENOUGH THAT THRU THE REST OF THE WEEK AND INTO THE WEEKEND ONLY AN ISOLATED SHOWER OR THUNDERSTORM WILL BE POSSIBLE.
THE COLD FRONT THAT CROSSED THE MID MISSISSIPPI VALLEY LAST NIGHT IS FORECAST TO BECOME QUASI-STATIONARY JUST SOUTH AND WEST OF OUR CWA BY LATE THIS AFTERNOON. HIGH PRESSURE IN THE WAKE OF THE FRONT HAS BROUGHT SOME RELIEF FROM THE RECENT STINT OF OPPRESSIVE HEAT AND HUMIDITY TODAY. SUBSIDENCE ASSOCIATED WITH AN EXPANDING SOUTH CENTRAL CONUS MID LEVEL RIDGE SHOULD SUPPRESS MOST DEEP MOIST CONVECTION FRI/FRI NIGHT. ON THE PERIPHERY OF THE SOUTH CENTRAL CONUS RIDGE. COUPLED WITH THE PASSAGE OF A SEWD-MOVING COLD FRONT SOMETIME DURING THE PERIOD.
952 PM EDT TUE JUL 21 2015 A COLD FRONT WILL DROP SOUTH OF THE AREA TONIGHT.
A WEAK COLD FRONT WILL MOVE THROUGH THE AREA LATE THIS EVENING AND OVERNIGHT.
/ISSUED 339 PM EDT TUE JUL 21 2015/ HIGH PRESSURE WILL CONTINUE TO DOMINATE MUCH OF THE WEEK. LOW PRESSURE FROM THE NORTH WILL BRING BETTER RAIN CHANCES TO SOUTH FLORIDA.
COOLER/DRIER AIR CONTINUES TO ADVANCE INTO THE REGION. AHEAD OF HIGH PRESSURE IN THE MS VALLEY. PATTERN OVERVIEW: BROAD UPPER LEVEL TROUGH SLOWING PUSHING AWAY FROM THE GREAT LAKES AS RISING HEIGHTS/RIDGING OVER THE PLAINS SLOWLY BEGIN TO WORK EASTWARD. THIS RIDGING ALONG WITH WARMER/MORE HUMID CONDITIONS WILL IMPACT NORTHERN MICHIGAN BY WEEK/S END. ANY DIURNAL CLOUDINESS WILL DIMINISH RAPIDLY THIS EVENING WITH QUIET AND CHILLY CONDITIONS OVERNIGHT AS HIGH PRESSURE SLOWLY SLIDES THROUGH THE OHIO VALLEY. WOULD NOT BE SURPRISED TO SEE A FEW OF THE COLDEST LOCATIONS DIP INTO THE LOWER 40S.
AFTERNOON SATELLITE IMAGERY SHOWS SOME HIGH CLOUDINESS PERSISTING ACROSS NORTH TEXAS WHICH IS HELPING TO KEEP TEMPERATURES A COUPLE OF DEGREES COOLER FROM YESTERDAY. THESE CLOUDS WERE MAINLY FROM REMNANT CONVECTION EARLY THIS MORNING ACROSS OKLAHOMA WHERE A WEAK COLD FRONTAL BOUNDARY PERSISTS.
1250 AM EDT WED JUL 22 2015 A WEAK COLD FRONT WILL APPROACH FROM THE NORTHWEST TONIGHT BEFORE STALLING OVER OR NEAR THE AREA EARLY WEDNESDAY.
731 PM EDT TUE JUL 21 2015 A LARGE AREA OF HIGH PRESSURE WILL BUILD OVERHEAD ON WEDNESDAY BRINGING A STRETCH OF DRY WEATHER FOR THE SECOND HALF OF THE WEEK.
637 PM CDT TUE JUL 21 2015 FOR 00Z TAFS /ISSUED 145 PM CDT TUE JUL 21 2015/ NOT AS HOT TODAY WITH TEMPS AT 145 PM IN THE LOWER 90S WITH DEWPOINTS MAINLY IN THE LOWER 70S.
742 PM EDT TUE JUL 21 2015 HIGH PRESSURE WILL BUILD INTO THE REGION FOR THE REST OF THE WEEK. COOLER AND DRIER WEATHER WILL PREVAIL. COLD FRONT WITH LINE OF SHOWERS AND SCATTERED THUNDERSTORMS WILL PASS SOUTH OF OUR FORECAST AREA BY EARLY THIS EVENING. COOLER AND DRIER NORTHWESTERLY FLOW WILL THEN BECOME ESTABLISHED OVERNIGHT UNDER A BUILDING RIDGE. EXTENDING INTO CNTRL NY/NEPA WILL KEEP CONDITIONS COOLER THAN A TYPICAL LATE JULY WITH INTERVALS OF CLOUDS AND SUNSHINE. VERY LITTLE CHANGE IN THE OVERALL PATTERN WITH A CLOSED LOW PARKED OVER EASTERN CANADA AND THE MARITIMES. A WEAK UPPER IMPULSE SEEMS TO ROTATE SOUTHWARD ALONG THE BASE OF THE LOW.
746 PM EDT TUE JUL 21 2015 HIGH PRESSURE WILL BRING CLEAR SKIES AND COMFORTABLE CONDITIONS FOR THE REGION THE NEXT COUPLE OF DAYS. LATEST SURFACE ANALYSIS HAS HIGH PRESSURE CENTERED OVER EASTERN NE/WESTERN IA WITH COLD FRONT EXTENDING DOWN ALONG THE OHIO RIVER VALLEY. BREEZY N/NW WINDS THIS AFTERNOON WILL QUICKLY DIMINISH THIS EVENING AS HIGH PRESSURE WILL DRIFT EASTWARD TONIGHT AND BE CENTERED OVER THE AREA WHICH WILL LEAD TO LIGHT AND VARIABLE WINDS BOTH TONIGHT AND MUCH OF THE DAY WEDNESDAY. UPPER LEVEL PATTERN WILL HAVE RIDGE AXIS OVER THE PLAINS LEAVING OUR REGION IN NW FLOW.
840 PM PDT TUE JUL 21 2015 A DEVELOPING UPPER-LEVEL LOW PRESSURE TROUGH ALONG THE WEST COAST WILL BRING COOLER AND DRIER WEATHER ACROSS THE SOUTHLAND FOR THE REMAINDER OF THE WEEK.
THE OVERALL SYNOPTIC PATTERN CALLS FOR A TROUGH TO HELP PUSH THE MAIN INSTABILITY EAST ON WEDNESDAY. AT THE SURFACE A COLD FRONT WILL BE MOVING INLAND AND WINDS COULD BE A CONCERN FOR THE KLAMATH AND GOOSE LAKE BASINS. NORTH WINDS WILL PEAK THIS EVENING AS HIGH PRESSURE BUILDS INTO THE PACIFIC NORTHWEST AND LOW PRESSURE NUDGES NORTHWARD ALONG THE COAST IN NORTHERN CALIFORNIA.
809 PM EDT TUE JUL 21 2015 A COLD FRONT WILL DROP SOUTH OF THE AREA TONIGHT.
1151 PM EDT TUE JUL 21 2015 DRY AIRMASS AND HIGH PRESSURE WILL SUPPORT MOSTLY CLEAR SKIES THROUGH THE TAF PERIOD. TONIGHT STRONGLY CONFLUENT NORTHWEST FLOW WILL FORCE HIGH PRESSURE TO MIGRATE FROM THE UPPER MS VALLEY INTO THE GREAT LAKES TONIGHT.
729 PM EDT TUE JUL 21 2015 UPPER LAKES IS STILL WITHIN THE INFLUENCE OF TROUGHING ALOFT WITH COOLER AIR ALOFT.
714 PM EDT TUE JUL 21 2015 A COLD FRONT WILL MOVE THROUGH FROM THE NORTHWEST EARLY WEDNESDAY MORNING.
1028 PM EDT TUE JUL 21 2015 A COLD FRONT EXITS EAST TONIGHT.
623 PM CDT TUE JUL 21 2015 AT H5 CLOSED LOW SOUTHERN HUDSON BAY WITH TROUGH THROUGH THE GREAT LAKES. RIDGE THROUGH THE NORTHERN PLAINS WITH STRONG WAVE MOVING UNDERNEATH ACROSS CENTRAL WYOMING. TROUGHING THROUGH THE WEST COAST.
714 PM EDT TUE JUL 21 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE IS EXPECTED ACROSS THE AREA THROUGH THE END OF THE WEEK. COURTESY OF HIGH PRESSURE. MODEL DATA SUGGEST UPPER HEIGHTS WILL BEGIN TO RISE DURING THIS PERIOD AS UPPER TROUGH OVER THE GREAT LAKES WILL LIFT OFF INTO NEW ENGLAND ON WEDNESDAY. AND SOUTHERN PLAINS RIDGE EXPANDS INTO THE MIDWEST.
1141 PM CDT TUE JUL 21 2015 HIGH PRESSURE WAS ENTRENCHED ACROSS THE AREA THIS AFTERNOON. THIS HIGH PRESSURE WAS LEADING TO MOSTLY CLEAR SKIES ACROSS THE AREA. DRIER AIR ASSOCIATED WITH THE HIGH PRESSURE WAS LEADING TO PLEASANT WEATHER CONDITIONS TODAY ACROSS THE AREA. HIGH PRESSURE WILL DOMINATE THE WEATHER THROUGH THE SHORT TERM. TEMPS WILL BE A DEGREE OR TWO WARMER THAN TODAY AS THE HIGH SLIDES TO THE EAST THROUGH THE PERIOD.
1127 PM EDT TUE JUL 21 2015 A COLD FRONT WILL CROSS THE AREA OVERNIGHT.
1149 PM CDT TUE JUL 21 2015 HIGH PRESSURE IS BRINGING CLEAR SKIES AND LIGHT WINDS TO CENTRAL ILLINOIS THIS EVENING. CURRENT TEMPS HAVE ALREADY DROPPED INTO THE LOWER TO MIDDLE 70S. A COOLER AND DRIER AIR MASS THAT HAS NOW SETTLED OVER THE AREA WILL RESULT IN TEMPERATURES REACHING AROUND 60 DEGREES BY MORNING. CONTINUED DRY AND LESS HUMID CONDITIONS, AND SLIGHTLY COOLER THAN NORMAL TEMPERATURES ARE EXPECTED TO START THE FORECAST PERIOD ACROSS CENTRAL AND SOUTHEAST ILLINOIS. AN AREA OF CANADIAN HIGH PRESSURE AT THE SURFACE AND NEUTRAL UPPER-LEVEL FLOW WILL HELP ENSURE THIS FACT. THE HIGH PRESSURE CENTER WILL DRIFT OFF TOWARD THE EAST COAST BY THE END OF THE WORK WEEK, WHILE UPPER-LEVEL RIDGING BUILDS INTO THE MIDWEST AND GREAT LAKES REGION.
A TROUGH OF LOW PRESSURE DEEPENS ALONG THE COAST WEDNESDAY AND DECENT CYCLONIC FLOW DEVELOPS OVER THE ENTIRE AREA. DELTA BREEZE HAS INCREASED AND SHOULD REMAIN MODERATE TO LOCALLY STRONG AT TIMES AT LEAST THROUGH WEDNESDAY NIGHT AS THE TROUGH DEEPENS ALONG THE COAST.
1001 PM EDT TUE JUL 21 2015 THE NEAR TERM SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE IS EXPECTED ACROSS THE AREA THROUGH THE END OF THE WEEK. SURFACE ANALYSIS THIS EVENING SHOWS A BROAD AREA OF HIGH PRESSURE IN PLACE OVER INDIANA AND THE UPPER MIDWEST. COOLER AND DRIER NORTHERLY FLOW WAS IN PLACE ACROSS THE FORECAST AREA. HAVE TRENDED LOWS OVERNIGHT SLIGHTLY COOLER THAN THE PREVIOUS FORECAST WITH DRY AIR IN PLACE AND GOOD RADIATIONAL COOLING IN PLACE. INCREASED SKY GRIDS ACROSS THE SOUTHERN PARTS OF THE FORECAST AREA TO ACCOUNT FOR THE HIGH CLOUD DRIFTING ACROSS THE SOUTHERN PARTS OF THE FORECAST AREA. MODEL DATA SUGGEST UPPER HEIGHTS WILL BEGIN TO RISE DURING THIS PERIOD AS UPPER TROUGH OVER THE GREAT LAKES WILL LIFT OFF INTO NEW ENGLAND ON WEDNESDAY. AND SOUTHERN PLAINS RIDGE EXPANDS INTO THE MIDWEST.
1155 PM EDT TUE JUL 21 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE IS EXPECTED ACROSS THE AREA THROUGH THE END OF THE WEEK. SURFACE ANALYSIS THIS EVENING SHOWS A BROAD AREA OF HIGH PRESSURE IN PLACE OVER INDIANA AND THE UPPER MIDWEST. COOLER AND DRIER NORTHERLY FLOW WAS IN PLACE ACROSS THE FORECAST AREA. HAVE TRENDED LOWS OVERNIGHT SLIGHTLY COOLER THAN THE PREVIOUS FORECAST WITH DRY AIR IN PLACE AND GOOD RADIATIONAL COOLING IN PLACE. INCREASED SKY GRIDS ACROSS THE SOUTHERN PARTS OF THE FORECAST AREA TO ACCOUNT FOR THE HIGH CLOUD DRIFTING ACROSS THE SOUTHERN PARTS OF THE FORECAST AREA. MODEL DATA SUGGEST UPPER HEIGHTS WILL BEGIN TO RISE DURING THIS PERIOD AS UPPER TROUGH OVER THE GREAT LAKES WILL LIFT OFF INTO NEW ENGLAND ON WEDNESDAY. AND SOUTHERN PLAINS RIDGE EXPANDS INTO THE MIDWEST.
DISTURBANCES RIDING THROUGH THE TOP OF THE FLATTENED RIDGE OF HIGH PRESSURE ALOFT OVER MEXICO AND THE SOUTHERN TWO THIRDS OF THE COUNTRY FROM THE FOUR CORNERS REGION INTO COAST OF THE CAROLINAS. SHORT WAVE TROUGH OF LOW PRESSURE MOVING ACROSS OKLAHOMA AND ACROSS ARKANSAS AND NEARING WESTERN TENNESSEE HELPING WITH SHOWERS AND THUNDERSTORMS THIS EVENING.
722 PM EDT TUE JUL 21 2015 A COLD FRONT CROSSES TONIGHT. DRY HIGH PRESSURE FOR WEDNESDAY INTO THE WEEKEND. A REAL COLD FRONT DROPS RAPIDLY SOUTHEAST ACROSS THE AREA TONIGHT. THEN FOLLOWED BY A MUCH COOLER AND DRIER AIRMASS. MODELS INDICATE DRIER LOW LEVEL AIR FLOWING IN AS HIGH PRESSURE BUILDS IN FROM THE NORTHWEST. AND EXPECT A SUN FILLED WEDNESDAY WITH MUCH COOLER AND DRIER AIR DESPITE THE SUNSHINE. LOOK FOR HIGHS IN THE LOWER 80S WEDNESDAY. HIGH PRESSURE WILL PROVIDE A TRANQUIL END TO THE WORK WEEK.
837 PM EDT TUE JUL 21 2015 A COLD FRONT WILL MOVE ACROSS THE REGION OVERNIGHT.
A WEAK UPPER LEVEL TROUGH OVER THE REGION WILL BRING CLOUDS AND A FEW SHOWERS TO WESTERN WASHINGTON WEDNESDAY AND WEDNESDAY EVENING.
HARD TO SAY WHERE EXACTLY THE COLD FRONT IS BUT JUDGING BY LATEST OBSERVATIONS IT IS PROBABLY STALLED JUST OVER OR TO THE SOUTH OF THE CWA.
AN UPPER LEVEL TROUGH WILL CONTINUE TO SLOWLY SETTLE OVER THE REGION. ON WEDNESDAY EXPECT SOME MORE CONVECTION OVER SOUTHEAST OREGON BUT SHOULD SHIFT SLIGHTLY SOUTHWARD DUE TO THE UPPER LEVEL TROUGH DROPPING SOUTH.
643 PM CDT TUE JUL 21 2015 HIGH PRESSURE SLOWLY MOVING EAST THROUGH THE CWA WHICH HAS LEAD TO A BEAUTIFUL DAY. HIGH PRESSURE WILL KEEP WINDS LIGHT THE LONGEST IN NORTHWEST IOWA SO LOWS WILL BE COOLEST THERE. CENTRAL SOUTH DAKOTA WILL SEE A SOUTHERLY GRADIENT INCREASE SO LOWS WILL BE WARMER. TRANSITIONING INTO A WARMER MORE HUMID AND MORE UNSTABLE.
852 PM EDT TUE JUL 21 2015 A COLD FRONT EXITS SOUTHEAST TONIGHT. DRY HIGH PRESSURE FOR WEDNESDAY INTO THE WEEKEND. SENT A QUICK UPDATE TO ACCELERATE THE EXODUS OF THE COLD FRONT TO THE EAST AND SOUTH. A REAL COLD FRONT DROPS RAPIDLY SOUTHEAST ACROSS THE AREA TONIGHT. THEN FOLLOWED BY A MUCH COOLER AND DRIER AIRMASS. MODELS INDICATE DRIER LOW LEVEL AIR FLOWING IN AS HIGH PRESSURE BUILDS IN FROM THE NORTHWEST. AND EXPECT A SUN FILLED WEDNESDAY WITH MUCH COOLER AND DRIER AIR DESPITE THE SUNSHINE. LOOK FOR HIGHS IN THE LOWER 80S WEDNESDAY. HIGH PRESSURE WILL PROVIDE A TRANQUIL END TO THE WORK WEEK.
922 PM EDT TUE JUL 21 2015 A LARGE AREA OF HIGH PRESSURE WILL BUILD OVERHEAD ON WEDNESDAY BRINGING A STRETCH OF DRY WEATHER FOR THE SECOND HALF OF THE WEEK.
ELONGATED RIDGE ALOFT WILL STILL BE ENOUGH TO LIMIT MOST ACTIVITY TOMORROW. THIS INCREASE OF LOW-LEVEL MOISTURE SEEMS TO BE THE BIGGEST INFLUENCE FOR PCPN ACROSS THE REGION AS THE UPPER RIDGE REMAINS PARKED OVERHEAD. A VERY PERSISTENT RIDGE OF HIGH PRESSURE OVER THE EASTERN GULF WILL MAINTAIN THIS ONSHORE FLOW THAT VARIES FROM SOUTHWESTERLY IN THE MORNING TO SOUTH THEN SOUTHEAST BY EARLY EVENING.
HOHMANN LOW PRESSURE WILL MOVE THROUGH THE EASTERN SIERRA AND WESTERN NEVADA WITH SHOWERS AND THUNDERSTORMS CONTINUING THROUGH WEDNESDAY.
1048 PM EDT TUE JUL 21 2015 A COLD FRONT WILL MOVE ACROSS THE REGION OVERNIGHT.
929 PM EDT TUE JUL 21 2015 A COLD FRONT WILL CROSS THE AREA THIS EVENING.
1141 PM CDT TUE JUL 21 2015 AT H5 CLOSED LOW SOUTHERN HUDSON BAY WITH TROUGH THROUGH THE GREAT LAKES. RIDGE THROUGH THE NORTHERN PLAINS WITH STRONG WAVE MOVING UNDERNEATH ACROSS CENTRAL WYOMING. TROUGHING THROUGH THE WEST COAST.
806 PM EDT TUE JUL 21 2015 DRY WEATHER AND SEASONAL TEMPERATURES CAN BE EXPECTED FOR THE REMAINDER OF THE WEEK AS HIGH PRESSURE SLIDES OVER THE UPPER OHIO REGION. UPDATE WAS ISSUED TO REMOVE PRECIP PROBS AS THE COLD FRONT HAS COMPLETED THE AREA SWEEP. BUILDING HIGH PRESSURE WITH COLD. HIGH PRESSURE UNDER NORTHWEST FLOW ALOFT IS FORECAST TO MAINTAIN DRY WEATHER AND SEASONAL TEMPERATURES FOR THE REMAINDER OF THE WEEK.
FURTHER NORTH CONVECTION WAS MORE ISOLATED IN NATURE AND LARGELY CONFINED TO THE HIGHER TERRAIN AS WELL AS OCCASIONAL INTERACTION OF OUTFLOW BOUNDARIES THIS EVENING. A DEEPENING TROUGH ALONG THE WEST COAST WILL HELP TO LIFT THIS DEFORMATION AXIS AND ATTENDANT THREAT FOR CONVECTION NORTHWARD INTO NORTHERN UT DURING THE DAY WEDNESDAY.
AN UPPER LEVEL TROUGH WILL SLOWLY SAG SOUTH INTO THE PACIFIC NORTHWEST TONIGHT AND WED.
/ISSUED 215 PM CDT TUE JUL 21 2015/ The upper ridge that has settled over Texas most of July will remain in place the rest of the week and likely through the end of the month. For the next couple of days though the ridge will flatten enough to allow a few disturbances to move across the area. Even though temperatures are a few degrees cooler than yesterday, most locations will still reach near the 100 degree mark. A similar setup is expected Wednesday before the ridge strengthens again over the area late this week.
1127 PM CDT TUE JUL 21 2015 HIGH PRESSURE SLOWLY MOVING EAST THROUGH THE CWA WHICH HAS LEAD TO A BEAUTIFUL DAY. HIGH PRESSURE WILL KEEP WINDS LIGHT THE LONGEST IN NORTHWEST IOWA SO LOWS WILL BE COOLEST THERE. CENTRAL SOUTH DAKOTA WILL SEE A SOUTHERLY GRADIENT INCREASE SO LOWS WILL BE WARMER. TRANSITIONING INTO A WARMER MORE HUMID AND MORE UNSTABLE.
934 PM CDT TUE JUL 21 2015 HIGH PRESSURE IS BRINGING CLEAR SKIES AND LIGHT WINDS TO CENTRAL ILLINOIS THIS EVENING. CURRENT TEMPS HAVE ALREADY DROPPED INTO THE LOWER TO MIDDLE 70S. A COOLER AND DRIER AIR MASS THAT HAS NOW SETTLED OVER THE AREA WILL RESULT IN TEMPERATURES REACHING AROUND 60 DEGREES BY MORNING. CONTINUED DRY AND LESS HUMID CONDITIONS, AND SLIGHTLY COOLER THAN NORMAL TEMPERATURES ARE EXPECTED TO START THE FORECAST PERIOD ACROSS CENTRAL AND SOUTHEAST ILLINOIS. AN AREA OF CANADIAN HIGH PRESSURE AT THE SURFACE AND NEUTRAL UPPER-LEVEL FLOW WILL HELP ENSURE THIS FACT. THE HIGH PRESSURE CENTER WILL DRIFT OFF TOWARD THE EAST COAST BY THE END OF THE WORK WEEK, WHILE UPPER-LEVEL RIDGING BUILDS INTO THE MIDWEST AND GREAT LAKES REGION.
It is still quite far south and with the trough axis moving east over the Cascades tonight.
DISTURBANCES RIDING THROUGH THE TOP OF THE FLATTENED RIDGE OF HIGH PRESSURE ALOFT OVER MEXICO AND THE SOUTHERN TWO THIRDS OF THE COUNTRY FROM THE FOUR CORNERS REGION INTO COAST OF THE CAROLINAS. SHORT WAVE TROUGH OF LOW PRESSURE MOVING ACROSS OKLAHOMA AND ACROSS ARKANSAS AND NEARING WESTERN TENNESSEE HELPING WITH SHOWERS AND THUNDERSTORMS THIS EVENING. /ISSUED 246 PM CDT TUE JUL 21 2015/ UPPER LVL RIDGE HAS BROKEN DOWN SLIGHTLY AS NW FLOW ALOFT HAS BROUGHT AN OUTFLOW BOUNDARY INTO SOUTHERN AR. THIS FLATTENING OF THE RIDGE WILL ONLY BE TEMPORARY. WITH RIDGE ONCE AGAIN EXPANDING NWD. THE GULF REMAINS QUIET EXCEPT FOR AN UPPER LOW NEAR THE YUCATAN.
A WEAK COLD FRONT WILL MOVE THROUGH THE AREA OVERNIGHT.
TEMPS WILL BE MILD AND CONDITIONS MUGGY WITH LOWS IN THE MID TO UPPER 70S WITH JUICY DEW PTS IN THE LOW/MID 70S.
/ISSUED 246 PM CDT TUE JUL 21 2015/ UPPER LVL RIDGE HAS BROKEN DOWN SLIGHTLY AS NW FLOW ALOFT HAS BROUGHT AN OUTFLOW BOUNDARY INTO SOUTHERN AR. THIS FLATTENING OF THE RIDGE WILL ONLY BE TEMPORARY. WITH RIDGE ONCE AGAIN EXPANDING NWD. THE GULF REMAINS QUIET EXCEPT FOR AN UPPER LOW NEAR THE YUCATAN.
704 PM EDT TUE JUL 21 2015 DRY AIRMASS AND HIGH PRESSURE WILL SUPPORT CLEAR TO MOSTLY CLEAR SKIES THROUGH THE TAF PERIOD. TONIGHT STRONGLY CONFLUENT NORTHWEST FLOW WILL FORCE HIGH PRESSURE TO MIGRATE FROM THE UPPER MS VALLEY INTO THE GREAT LAKES TONIGHT.
800 PM EDT TUE JUL 21 2015 HIGH PRESSURE WILL BUILD INTO THE REGION FOR THE REST OF THE WEEK. COOLER AND DRIER WEATHER WILL PREVAIL. IN THE WAKE OF AN EARLIER COLD FRONTAL PASSAGE. ASSOCIATED WITH A DEEPENING UPPER-LEVEL TROUGH. COLD FRONT WITH LINE OF SHOWERS AND SCATTERED THUNDERSTORMS WILL PASS SOUTH OF OUR FORECAST AREA BY EARLY THIS EVENING. COOLER AND DRIER NORTHWESTERLY FLOW WILL THEN BECOME ESTABLISHED OVERNIGHT UNDER A BUILDING RIDGE. EXTENDING INTO CNTRL NY/NEPA WILL KEEP CONDITIONS COOLER THAN A TYPICAL LATE JULY WITH INTERVALS OF CLOUDS AND SUNSHINE. VERY LITTLE CHANGE IN THE OVERALL PATTERN WITH A CLOSED LOW PARKED OVER EASTERN CANADA AND THE MARITIMES. A WEAK UPPER IMPULSE SEEMS TO ROTATE SOUTHWARD ALONG THE BASE OF THE LOW.
TEMPERATURES WERE SLIGHTLY WARMER THAN EXPECTED. MADE SOME SMALL ADJUSTMENTS TO THE LOWS FOR THE DELTA.
722 PM EDT TUE JUL 21 2015 PATTERN OVERVIEW: BROAD UPPER LEVEL TROUGH SLOWING PUSHING AWAY FROM THE GREAT LAKES AS RISING HEIGHTS/RIDGING OVER THE PLAINS SLOWLY BEGIN TO WORK EASTWARD. THIS RIDGING ALONG WITH WARMER/MORE HUMID CONDITIONS WILL IMPACT NORTHERN MICHIGAN BY WEEK/S END. ANY DIURNAL CLOUDINESS WILL DIMINISH RAPIDLY THIS EVENING WITH QUIET AND CHILLY CONDITIONS OVERNIGHT AS HIGH PRESSURE SLOWLY SLIDES THROUGH THE OHIO VALLEY. WOULD NOT BE SURPRISED TO SEE A FEW OF THE COLDEST LOCATIONS DIP INTO THE LOWER 40S.
613 PM CDT TUE JUL 21 2015 HIGH PRESSURE WAS ENTRENCHED ACROSS THE AREA THIS AFTERNOON. THIS HIGH PRESSURE WAS LEADING TO MOSTLY CLEAR SKIES ACROSS THE AREA. DRIER AIR ASSOCIATED WITH THE HIGH PRESSURE WAS LEADING TO PLEASANT WEATHER CONDITIONS TODAY ACROSS THE AREA. HIGH PRESSURE WILL DOMINATE THE WEATHER THROUGH THE SHORT TERM. TEMPS WILL BE A DEGREE OR TWO WARMER THAN TODAY AS THE HIGH SLIDES TO THE EAST THROUGH THE PERIOD.
855 PM EDT TUE JUL 21 2015 FROM THE SPACE BORN REFERENCE FRAME WE FIND AN UPPER LEVEL LOW NEAR THE YUCATAN PENINSULA. AND A LARGE UPPER LOW MOVING EASTWARD ACROSS MAINE AND THE CANADIAN MARITIME PROVINCES. A TROUGH IS DRAPED ACROSS THE MID ATLANTIC COAST WITH A SHORT WAVE OVER THE TENNESSEE RIVER VALLEY. THERE IS PLENTY OF MOISTURE IN THE LOW LEVELS.
831 PM EDT TUE JUL 21 2015 A COLD FRONT WILL CROSS THE AREA LATE TODAY ACCOMPANIED BY SHOWERS AND THUNDERSTORMS.
1258 AM EDT WED JUL 22 2015 A COLD FRONT EXITS EAST TONIGHT.
CHATTANOOGA AIRPORT, TN 72 90 73 88 / 20 40 30 70 KNOXVILLE MCGHEE TYSON AIRPORT, TN 71 87 71 84 / 20 30 20 70 OAK RIDGE, TN 71 87 71 85 / 20 30 20 70 TRI CITIES AIRPORT, TN 66 85 66 82 / 20 20 20 50.
SLIGHTLY COOLER THAN NORMAL TEMPERATURES AND PLEASANT WEATHER CONDITIONS ARE EXPECTED ONCE AGAIN SUNDAY. AS HIGH PRESSURE BUILDS INTO THE PACIFIC NORTHWEST AND WINDS BECOME OFFSHORE.
Low pressure moves through the region tonight through Monday.