Aikyam-Lab/Synoptic-Bench huggingface dataset:
118 AM EDT SUN JUL 5 2015 HIGH PRESSURE OVER OUR AREA WILL MOVE EAST TO NEW ENGLAND TONIGHT AS A WEAK LOW PRESSURE SYSTEMS LIFTS NORTHEAST FROM KENTUCKY TO OHIO. GREAT LAKES TO REMAIN UNDER THE INFLUENCE OF MODERATE AMPLITUDE RIDGE CURRENTLY BUILDING INTO THE REGION. WITH MID/UPPER LEVEL TROUGH TRAVERSING THE GULF COAST STATES. WARMER CONDITIONS EXPECTED TOMORROW AS LOW LEVEL RIDGE SLOWLY SHIFTS EAST AND LIGHT SOUTHERLY FLOW/WAA DEVELOPS.
255 AM PDT SUN JUL 5 2015 HIGH PRESSURE OVER THE INTERIOR SOUTHWEST STATES WILL KEEP A FLOW OF MID LEVEL MONSOONAL MOISTURE INTO SOUTHERN CALIFORNIA INTO MONDAY WITH THE MOUNTAINS OF SOUTHWESTERN CALIFORNIA ON THE WESTERN FRINGE OF THIS MOISTURE. A WEAK LOW PRESSURE SYSTEM OFF THE CALIFORNIA COAST WILL MOVE SLOWLY INLAND THE MID TO LATTER PART OF THE WEEK. HIGH PRESSURE TO THE EAST WILL BEGIN TO EXPAND WESTWARD ACROSS SOUTHERN CALIFORNIA BRINGING WARMING TO NEAR SEASONAL LEVELS AND A SHALLOWER MARINE LAYER.
340 AM CDT SUN JUL 5 2015 HIGH PRESSURE HAS SHIFTED OFF TO THE SOUTHEAST WITH AN AREA OF LOW PRESSURE APPROACHING THE REGION CENTERED ACROSS THE NORTHERN HIGH PLAINS. THIS AREA OF LOW PRESSURE WILL SHIFT ESE TODAY BECOMING CENTERED OVER CENTRAL SD/NE BY LATE TODAY. AN UPPER TROUGH DIGGING INTO THE NORTHERN PLAINS WILL DRIVE A SURFACE COLD FRONT SOUTHEAST THROUGH THE CORN BELT.
418 AM EDT SUN JUL 5 2015 AN UPPER LEVEL LOW OVER MIDDLE TENNESSEE EARLY THIS MORNING WILL WEAKEN AS IT MOVES SLOWLY NE TO NEAR THE OH/WV BORDER BY MONDAY EVENING.
TEMPERATURES WILL BE A LOT COOLER THANKS IN PART TO COOLER AIR ARRIVING BUT MAINLY DUE TO MORE CLOUDS.
109 AM EDT SUN JUL 5 2015 A WEAK COLD FRONT WILL APPROACH THE REGION FROM QUEBEC OVERNIGHT AND MOVE ACROSS THE REGION ON SUNDAY WITH A CHANCE OF SHOWERS AND POSSIBLE THUNDERSTORMS. HIGH PRESSURE AND WARMER TEMPERATURES RETURNS BEHIND THE FRONT FOR MONDAY.
619 AM EDT SUN JUL 5 2015 CLOSED MID/UPPER LEVEL LOW APPROACHES TODAY. OPENS INTO TROUGH TONIGHT OR MONDAY AS IT PASSES OVER.
HIGH VERY WEAK 250 MB FLOW WITH A RIDGE TO THE NORTH AND TROUGH WELL SOUTH. SURFACE DEWPOINTS SHOULD BE IN THE LOWER 60S THIS MORNING AND INCREASE TO THE MID 60S LATER THIS AFTERNOON. MEDIUM MODELS REMAIN IN PRETTY GOOD AGREEMENT WITH THE TIMING OF A LOW PRESSURE SYSTEM AND ASSOCIATED COLD FRONT ON MONDAY.
253 AM PDT SUN JUL 5 2015 LOW PRESSURE NEAR THE CALIFORNIA COAST WILL KEEP THE THREAT FOR SHOWERS AND THUNDERSTORMS THROUGH MUCH OF THE UPCOMING WEEK.
331 AM EDT SUN JUL 5 2015 HIGH PRESSURE WILL ENSURE A DRY AND SEASONABLY WARM CLOSE TO THE HOLIDAY WEEKEND FOR MOST AREAS.
LESS ACTIVITY OVER THE PLAINS DUE TO WARM AIR AND SUBSIDENCE ALOFT UNDER UPPER LEVEL RIDGING. ROUNDS THE TOP OF THE RIDGE OVER COLORADO AND PASSES THROUGH THE AREA DURING THE LATE MORNING AND AFTERNOON HOURS. COLD FRONT DROPS THROUGH THE PLAINS SUNDAY NIGHT. COOLER EASTERLY UPSLOPE FLOW WILL SPREAD ACROSS THE SOUTHEAST PLAINS.
A MID LEVEL RIDGE WILL REPLACE A LOW AMPLITUDE TROUGH OVER THE SOUTHEAST BEYOND THE MIDDLE OF THE WORK WEEK. BUT A WEAK TROUGH SHOULD SLIDE NEAR THE LOCAL AREA.
RAIN CHANCES WILL DECREASE AS A LOW PRESSURE SYSTEM APPROACHES CENTRAL CALIFORNIA. THIS WAS MAINLY BASED ON A DISTURBANCE TRACKING NORTHWARD IN THE SOUTHERLY FLOW AROUND THE UPPER HIGH CENTERED OVER NEW MEXICO AND THE LOW PRESSURE SYSTEM APPROACHING THE CALIFORNIA COAST.
325 AM EDT SUN JUL 5 2015 WEAK LOW PRESSURE WILL CROSS JUST NORTH OF THE AREA TODAY ACCOMPANIED BY SCATTERED SHOWERS OR STORMS.
151 AM EDT SUN JUL 5 2015 A RIDGE OF HIGH PRESSURE WILL DRIFT SLOWLY SE ACROSS PENNSYLVANIA TODAY. THIS WEATHER FEATURE WILL BRING DRY AND WARMER CONDITIONS FOR THE SECOND HALF OF THE HOLIDAY WEEKEND. COLD FRONT ACROSS THE LOWER LAKES MAY JUST FALL APART LATER IN THE WEEK. LOW CLOUDS AROUND LOW PRESSURE THAT BROUGHT WIDESPREAD RAIN EARLIER TODAY CONTINUES TO MOVE ONLY SLOWLY EAST.
404 AM EDT SUN JUL 5 2015 UPPER-LEVEL TROUGH WILL MOVE THROUGH TODAY AND MONDAY. HIGH PRESSURE WILL BUILD IN FOR THE REMAINDER OF THE WEEK WITH MOSTLY DRY CONDITIONS. MODELS HAVE UPPER-LEVEL TROUGH PULLING OFF TO THE NORTHEAST TODAY AND LATE TONIGHT. THE CENTER OF THE CLOSED UPPER LOW WILL BE MOVING SLOWLY NORTHEASTWARD THROUGH THE OHIO RIVER VALLEY DURING THE DAY MONDAY. A TROUGH AXIS WILL MOVE ACROSS THE CAROLINAS EARLY IN THE DAY ON MONDAY AS THE LOW KICKS OUT.
533 AM EDT SUN JUL 5 2015 A STATIONARY FRONT WILL REMAIN OVER THE CAROLINAS THIS MORNING AS WEAK HIGH PRESSURE CENTERED OVER PENNSYLVANIA SHIFTS EAST. THE FRONT WILL LIFT NORTH INTO THE AREA AS A WARM FRONT MONDAY.
403 AM EDT SUN JUL 5 2015 A WEAK COLD FRONT WILL MOVE ACROSS THE REGION TODAY WITH SOME SCATTERED SHOWERS AND POSSIBLE THUNDERSTORMS. HIGH PRESSURE AND WARMER TEMPERATURES ARE EXPECTED TO RETURN FOR MONDAY.
121 AM EDT SUN JUL 5 2015 AN UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE SOUTH OF THE AREA ON SUNDAY AND WORK ACROSS EASTERN PORTIONS OF THE FA ON MONDAY.
430 AM CDT SUN JUL 5 2015 UA RIDGING CONTINUED TO SHIFT EWRD TO ACROSS THE REGION EARLY THIS MORNING. DESPITE THE PROXIMITY OF THE SAID UA RIDGE. ANOTHER MILD NIGHT IS IN STORE WITH MIDDLE TO UPPER 60S ACROSS THE SOUTH PLAINS TO THE LOWER 70S ACROSS THE ROLLING PLAINS EXPECTED.
1130 PM MDT SAT JUL 4 2015 UPDATED AVIATION SECTION A COLD FRONT IS PUSHING TOWARDS THE INTERNATIONAL BORDER AS OF 7PM MDT. COOLER TEMPERATURES AND SCATTERED SHOWERS ARE EXPECTED ON SUNDAY. COLD FRONT CONTINUES TO MOVE SOUTH ACROSS THE AREA OVERNIGHT. A CANADIAN COLD FRONT WILL MOVE SOUTHWARD THROUGH THE REGION TONIGHT. AT 3 PM THE COLD FRONT WAS STILL NORTH OF CALGARY. MAINLY NORTH OF GREAT FALLS ALONG THE COLD FRONT. TEMPERATURES WILL BE QUITE A BIT COOLER ON SUNDAY ACROSS THE REGION. AS WARMER AIR TRIES TO PUSH BACK NORTHWARD INTO THE REGION.
COOLER WEATHER WILL ARRIVE LATE THIS WEEK AS AN UPPER TROUGH NEARS THE AREA AND ONSHORE FLOW INCREASES.
345 PM CDT TUE AUG 25 2015 THE COLD FRONT. THE COLD FRONT HAS MADE GOOD STRIDES UNDER ALL THE CLOUDS AS HEATING TENDS TO SLOW FRONTS IN THE DAYTIME.
WITH TEMP TRENDS GRADUALLY CLIMBING INTO THE LOWER 70S RANGE FOR MANY LOCATIONS. STRONG HIGH PRESSURE OVER THE MIDWEST STATES SHOULD CONTINUE TO BUILD SLOWLY EWD WELL INTO THE AFTERNOON/EVENING HRS. LOOK FOR AFTERNOON HIGHS TO CLIMB COMFORTABLY INTO THE LOWER/MID 80S FOR MOST AREAS.
130 PM EDT TUE AUG 25 2015 CANADIAN HIGH PRESSURE WILL SETTLE TO OUR NORTH OVER THE NEXT COUPLE OF DAYS MAINTAINING MOSTLY DRY CONDITIONS THROUGH MOST OF THE WORK WEEK. AS THE HIGH SLIDES OFFSHORE OVER THE WEEKEND. AN UPPER TROF WILL DIG ACRS THE GREAT LAKES TO THE OHIO VALLEY. A COLD FRONT WILL SLOWLY PUSH TO THE ATLANTIC COASTAL PLAIN TODAY. THE SHORT TERM MODELS ARE IN GOOD AGREEMENT THAT THE UPPER TROUGH WILL BEGIN TO RETROGRADE.
323 PM CDT TUE AUG 25 2015 LOW PRESSURE THAT HAS BROUGHT CLOUDS TO MOST OF THE UPPER GRT LAKES THE PAST COUPLE OF DAYS. HIGH PRESSURE WAS BUILDING INTO THE AREA FROM THE WEST. THIS HIGH PRESSURE WILL DOMINATE OUR WEATHER IN THE SHORT TERM. WITH THE HIGH PRESSURE MOVING INTO THE AREA. WITH THE HIGH PRESSURE MOVING INTO THE AREA TONIGHT. THERE IS A POSSIBILITY THAT TEMPERATURES COULD DROP SLIGHTLY COOLER THAN LAST NIGHT. WITH THE HIGH PRESSURE AND CLEAR SKIES FORECAST FOR TONIGHT.
Models this morning were in good agreement with temperatures in the 850mb to 700mb level warming through mid week as an upper level ridge axis shifts east out of the Rockies and into the Central Plains. By Wednesday night this upper level ridge axis will begin to weaken as an upper level trough moves east cross the central Rockies. As this upper level disturbance approaches from the west tonight and Wednesday a trough of low pressure will deepen along the lee of the Rockies.
With high pressure firmly in place, smoke continues to cause reduced visibilities across western Montana and north central Idaho valleys this afternoon.
317 PM CDT TUE AUG 25 2015 UPPER LEVEL RIDGING WILL CONTINUE TO BUILD WEST OF THE REGION TONIGHT AND WEDNESDAY.
322 PM CDT TUE AUG 25 2015 THE MID/UPPER RIDGE OVER THE SOUTHERN ROCKIES IS PROGGED TO EXPAND EASTWARD TOWARD THE AREA THROUGH EARLY THU WITH RISING HEIGHTS/INCREASING THICKNESS SUPPORTING RISING TEMPERATURES ACROSS THE AREA.
303 PM MDT TUE AUG 25 2015 AN UPR RIDGE REMAINS OVR THE AREA TODAY AND SO FAR THIS AFTERNOON. ON WED THE UPR RIDGE REMAINS OVR THE AREA BUT A DISTURBANCE WL MOVE NORTH-NORTHEASTWARD FROM SWRN CO TO NORTH CENTRAL CO DURING THE DAY.
SOMETHING TO KEEP AN EYE ON IF PLANNING FLIGHTS TO THE LOWER VALLEY DURING THE MID TO LATE MORNING WEDNESDAY.
TONIGHT AND WEDNESDAY AN UPPER LEVEL CYCLONE THAT WAS SOUTH OF JAMES BAY IS NOT EXPECTED TO MOVE MUCH OVERNIGHT BUT SHOULD WEAKEN AS IT STARTS TO MAKE ITS WAY ACROSS QUEBEC ON WEDNESDAY. LOW CLOUDS IN CYCLONIC FLOW AROUND THE LOW SHOULD REMAIN ACROSS THE AREA DURING THE NIGHT AND BEGIN TO EXIT DURING THE DAY ON WEDNESDAY. DECREASING CLOUDS ON WEDNESDAY SHOULD ALLOW TEMPERATURES TO GET SEVERAL DEGREES WARMER THAN THEY WERE TODAY. WEDNESDAY NIGHT THROUGH TUESDAY UPPER LOW OVER SE CANADA CONTINUES TO LOSE INFLUENCE OVER AREA WEATHER AS UPPER RIDGING OVER THE WEST MOVES EAST.
UPPER LEVEL RIDGE WILL REMAIN OVER THE HIGH PLAINS REGION THROUGH WEDNESDAY RESULTING IN A NORTHWEST FLOW ALOFT ACROSS NORTH DAKOTA. WAA CONTINUES WEDNESDAY WITH HIGHS IN THE LOW 90S WEST TO LOW/MID 80S OVER MY CENTRAL AND EAST. AN UPPER LEVEL RIDGE WILL CONTINUE TO BUILD INTO THE NORTHERN PLAINS WEDNESDAY.
330 PM EDT TUE AUG 25 2015 A LARGE AND VERY SLOW MOVING UPPER LEVEL TROUGH OF LOW PRESSURE OVER EASTERN CANADA WILL IMPACT THE NORTH COUNTRY RIGHT THROUGH THE END OF THE WEEK.
LOW PRESSURE OVER JAMES BAY WILL CONTINUE TO LIFT NORTHEAST TONIGHT AS HIGH PRESSURE OVER THE PLAINS SLOWLY SPREADS EAST TONIGHT AND WEDNESDAY. WINDS WILL TURN MORE NORTHERLY ACROSS THE LAKE LATER TONIGHT INTO WEDNESDAY MORNING AS THE HIGH APPROACHES. WHILE TEMPS SHOULD WARM INTO THE LOWER/MID 70S WEDNESDAY. WINDS TURN NORTHEAST OFF LAKE MICHIGAN AND TEMPS COULD COOL INTO THE LOWER/MID 60S NEAR THE LAKE BY EVENING.
256 PM EDT TUE AUG 25 2015 THE ISLAND CLOUD LINE HAS ACTIVATED THIS AFTERNOON WITH SHOWERS AND THUNDERSTORMS ALONG THE LOWER KEYS ESPECIALLY. MOST ROBUST NEAR THE LOWER KEYS.
306 PM PDT TUE AUG 25 2015 TEMPERATURES WILL REMAIN NEAR TO SLIGHTLY ABOVE NORMAL AS THE UPPER-LEVEL RIDGE LINGERS OVER THE REGION THROUGH MUCH OF THE WEEK.
139 PM EDT TUE AUG 25 2015 LINGERING CLOUDS ASSOCIATED WITH A DEEP LOW PRESSURE AREA WILL PERSIST THROUGH THE REST OF TODAY INTO TONIGHT. COINCIDENT W/ LAKE AGGREGATE SFC TROF. PESKY UPPER LOW WILL BE DRIFTING AWAY FROM THE UPPER GREAT LAKES WEDNESDAY.
252 PM CDT TUE AUG 25 2015 QUIET WEATHER IS EXPECTED THROUGH THE SHORT TERM PERIODS AS HIGH PRESSURE IN THE UPPER LEVELS OF THE ATMOSPHERE DOMINATES THE LOCAL WEATHER PATTERN. AS LOW PRESSURE THEN DEVELOPS ON THE LEE SIDE OF THE ROCKIES TOMORROW AFTERNOON. EXPECT INCREASING SOUTHERLY WINDS TO ADVECT WARMER AND MORE HUMID AIR NORTHWARD.
SATELLITE IMAGERY WAS SHOWING THE UPPER RIDGE AXIS OVER WRN WYOMING EARLY THIS AFTERNOON AS A SUB-TROPICAL WAVE WAS NOTED LIFTING NORTH AROUND THE WRN PERIPHERY OF THE HIGH AND A LOW PRESSURE SYSTEM WAS DROPPING SW INTO A POSITION OFF THE NW COAST.
500 MB PATTERN SHOWED A HIGH CENTERED OVER CO AND A RIDGE EXTENDING FROM THAT HIGH UP INTO CENTRAL CANADA. A TROUGH WAS LOCATED OFF THE COAST OF THE PACIFIC NW. A THERMAL RIDGE WAS OVER THE ROCKIES. THIS WILL CONTINUE TO LIFT NWD AND EVENTUALLY ROTATE AROUND THE MID TROPOSPHERIC RIDGE OVER THE ROCKIES.
300 PM CDT TUE AUG 25 2015 LARGE UPPER LOW CONTINUES TO SPIN ACROSS EASTERN ONTARIO. WITH MOST LOCATIONS SEEING LOWS IN THE LOWER 50S. CENTRAL/SE IL STILL CAUGHT UP IN CYCLONIC FLOW ANOTHER DAY ON WED WITH FEW-SCT CUMULUS CLOUDS NE CWA WED AFTERNOON NNW WINDS NOT AS GUSTY AS TODAY AND YESTERDAY AS HIGH PRESSURE NEARS IL. STAYED CLOSE TO SIMILAR GUIDANCE FOR HIGHS NEXT FEW DAYS AND SIDED TOWARD COOLER LOWS IN LOW TO MID 50S WED NIGHT WITH HIGH PRESSURE MOVING IN AND LIGHT TO CALM WINDS AND FAIR SKIES.
238 PM CDT TUE AUG 25 2015 QUIET WEATHER CONDITIONS WILL CONTINUE THROUGH THE WORK WEEK AS AN UPPER RIDGE BUILDS IN AND BROAD NORTHERLY FLOW KEEPS CONDITIONS A BIT DRIER AROUND THE AREA.
241 PM CDT TUE AUG 25 2015 As a deep stacked low over the Great Lakes/srn Canada moves toward the Canadian Maritimes region and damps out, gradient nwrly flow aloft between it and a swrn CONUS mid level ridge will continue over the PAH forecast area for the next couple of days.
A TROUGH OF LOW PRESSURE WILL SLIDE SOUTHEAST ACROSS SE GA TO NEAR THE FL/GA LINE THROUGH WEDNESDAY.
349 PM CDT TUE AUG 25 2015 AN ABSOLUTELY BEAUTIFUL DAY ACROSS THE AREA TODAY AS A COLD FRONT HAS PUSHED THROUGH THE FORECAST AREA. AND EXPECT THE LOWER DEWPOINTS TO STICK AROUND FOR A FEW DAYS.
THE UPPER LOW OVER EASTERN ONTARIO AND THE CORRESPONDING LOW PRESSURE NEAR JAMES BAY WILL FINALLY SHIFT EAST TONIGHT AND WEDNESDAY. DIMINISHING CLOUDS TONIGHT WILL ALLOW TEMPERATURES TO DROP INTO THE LOWER 50S INLAND FROM LAKE MICHIGAN.
303 PM EDT TUE AUG 25 2015 LINGERING CLOUDS ASSOCIATED WITH A DEEP LOW PRESSURE AREA WILL PERSIST THROUGH THE REST OF TODAY INTO TONIGHT. ALREADY BEGINNING TO SEE THE TROF AXIS SHIFTING AND NARROWING AS RIDGING STARTS BUILDING TO THE WEST. ANOMOLOUSLY COLD SYSTEM FOR THIS PERIOD WITH SEVERAL SHORT WAVES AND WEAK SURFACE BOUNDARIES ACROSS THE WESTERN PORTION OF THE TROF. AS THE TROF BEGINS TO LIFT EAST.
238 PM EDT TUE AUG 25 2015 HIGH PRESSURE WILL MOVE EAST FROM THE PLAINS THROUGH THE WEEK. HIGH PRESSURE FROM THE PLAINS WILL SLIDE EASTWARD THIS AFTERNOON INTO TONIGHT AND MOVE YESTERDAYS COLD FRONT WITH A COUPLE OF WAVES OF LOW PRESSURE ALONG IT EASTWARD TO THE ATLANTIC COAST. MOSTLY CLEAR CONDITIONS ANTICIPATED OVERNIGHT WITH LOW TEMPERATURES FROM THE LOWER 40S IN THE COLDER VALLEYS TO THE LOWER 60S IN THE PIEDMONT. LONGWAVE UPPER TROUGH ASSOCIATED WITH GREAT LAKES LOW PRESSURE CENTER WILL CONTINUE TO SLIDE EAST WEDNESDAY.
PLENTY OF LOW LEVEL MOISTURE WRAPPED AROUND THIS LOW IS PRODUCING LARGE STRATUS DECK OVER THE GREAT LAKES. LOWS TONIGHT MAINLY LOW TO MID 50S UPPER LEVEL TROUGH AXIS WILL SLOWLY CLEAR THE CENTRAL GREAT LAKES TOMORROW.
258 PM MDT TUE AUG 25 2015 BROAD UPPER-LEVEL RIDGING EXTENDS ACROSS THE WESTERN HALF OF THE US THIS AFTERNOON. RECENT WATER VAPOR SATELLITE IMAGERY SHOWS A PLUME OF MONSOONAL MOISTURE LIFTING NORTH OVER THE FOUR CORNERS REGION ON THE WEST SIDE OF THE RIDGE. MORE WIDESPREAD SHOWERS AND THUNDERSTORMS STILL EXPECTED FROM WED AFTN THROUGH THU WITH THE PASSAGE OF A STRONG PACIFIC COLD FRONT AND VIGOROUS MID-LEVEL SHORT WAVE TROUGH. MUCH COOLER FOR THU AS MOST OF THE MODELS SHOW H7 TEMPS PLUNGING FROM +16 C AT 00Z THU.
143 PM EDT TUE AUG 25 2015 THE MAIN FOCUS FOR SHOWERS AND ISOLATED STORMS TODAY WILL BE OVER THE EASTERN HALF OF VERMONT TODAY AS A COLD FRONT MOVES ACROSS THIS AREA.
WEDNESDAY LOOKS INTERESTING WITH A COLD FRONT POTENTIALLY BACKING INTO THE AREA FROM THE NORTHEAST. SHOULD HAVE COOLER MIN TEMPS WEDNESDAY NIGHT.
153 PM EDT TUE AUG 25 2015 HIGH PRESSURE. WEAK HIGH PRESSURE WILL BUILD FROM THE EAST AS CLOUDS ROTATE AROUND THE UPPER LEVEL LOW TO THE NORTH. THE HIGH RESOLUTION MODELS ARE TRYING TO DEVELOP FOG OVERNIGHT BUT CONFIDENCE IS LOW AT THIS TIME. DEEP UPPER TROF SETTLES INTO E NORTH AMERICA. BROAD CYCLONIC FLOW AROUND UPPER LOW OVER GREAT LAKES REGION WILL BE RESPONSIBLE FOR SENDING PERTURBATIONS THRU THE OH VALLEY FROM TIME TO TIME.
217 PM CDT TUE AUG 25 2015 MUCH COOLER AND DRIER AIRMASS IN PLACE TODAY. TEMPERATURES JUST NOW REACHING THE LOW 80S ACROSS THE NORTH WITH MID TO UPPER 80S SOUTH.
458 PM MDT TUE AUG 25 2015 BROAD UPPER-LEVEL RIDGING EXTENDS ACROSS THE WESTERN HALF OF THE US THIS AFTERNOON. RECENT WATER VAPOR SATELLITE IMAGERY SHOWS A PLUME OF MONSOONAL MOISTURE LIFTING NORTH OVER THE FOUR CORNERS REGION ON THE WEST SIDE OF THE RIDGE. MORE WIDESPREAD SHOWERS AND THUNDERSTORMS STILL EXPECTED FROM WED AFTN THROUGH THU WITH THE PASSAGE OF A STRONG PACIFIC COLD FRONT AND VIGOROUS MID-LEVEL SHORT WAVE TROUGH. MUCH COOLER FOR THU AS MOST OF THE MODELS SHOW H7 TEMPS PLUNGING FROM +16 C AT 00Z THU.
404 PM EDT TUE AUG 25 2015 A TROUGH OF LOW PRESSURE IN THE UPPER ATMOSPHERE WILL PROVIDE COOL TEMPERATURES AND PARTLY TO MOSTLY CLOUDY SKIES THROUGH WEDNESDAY.
232 PM MDT TUE AUG 25 2015 EARLY AFTERNOON WV IMAGERY AND RAP UPPER LEVEL ANALYSIS SHOWS RIDGE IN PLACE ACROSS CENTRAL ROCKIES. AT THE SURFACE LEE TROUGH IS IN PLACE ACROSS EASTERN COLORADO WITH MAIN AXIS EXTENDING ACROSS SE COLORADO INTO SW KANSAS. CONVECTIVE INITIATION WILL MAINLY BE ALONG TROUGH AXIS AND ALONG HIGHER TERRAIN IN COLORADO (WEST OF OUR CWA.
THIS DRIER AIR WILL CONTINUE TO OVER TAKE THE FORECAST AREA TONIGHT AS A LARGE HIGH PRESSURE SYSTEM LOCATED OVER THE FAR NORTHERN PLAINS CONTINUES TO BUILD IN. THIS HIGH PRESSURE SYSTEM WILL PREVAIL FOR THE NEXT FEW DAYS KEEPING THE GULF CUT OFF AND A DRY CONTINENTAL AIR MASS IN PLACE.
201 PM MDT TUE AUG 25 2015 EARLY AFTERNOON WV IMAGERY AND RAP UPPER LEVEL ANALYSIS SHOWS RIDGE IN PLACE ACROSS CENTRAL ROCKIES. AT THE SURFACE LEE TROUGH IS IN PLACE ACROSS EASTERN COLORADO WITH MAIN AXIS EXTENDING ACROSS SE COLORADO INTO SW KANSAS. CONVECTIVE INITIATION WILL MAINLY BE ALONG TROUGH AXIS AND ALONG HIGHER TERRAIN IN COLORADO (WEST OF OUR CWA.
655 PM EDT TUE AUG 25 2015 AVIATION A LARGE SLOW MOVING LOW PRESSURE SYSTEM OVER THE LAKE SUPERIOR REGION WILL CONTINUE TO PRODUCE FALL LIKE WEATHER THROUGH WEDNESDAY WITH EXTENSIVE CLOUD COVER AND VERY COOL TEMPERATURES.
THE SYNOPTIC PATTERN OVER THE CONUS WAS HIGHLIGHTED BY A BROAD TROUGH OVER THE EASTERN THIRD. AND A STEADILY AMPLIFYING RIDGE OF HIGH PRESSURE CENTERED OVER THE FOUR CORNERS REGION. ANOTHER TROUGH OF LOW PRESSURE WAS BEGINNING TO DIG INTO THE PACIFIC NORTHWEST. RIDGE OF HIGH PRESSURE ALOFT WILL KEEP THE LOCAL WEATHER FAIRLY QUIET THROUGH THE SHORT TERM PERIOD. THIS WILL KEEP LOW TEMPERATURES TONIGHT MUCH WARMER THAN THE WELL BELOW NORMAL LOWS EXPERIENCED OVER THE PREVIOUS COUPLE DAYS. BUT NORTHWESTERLY FLOW ALOFT WOULD STEER ANY CONVECTION SOUTH OF THE CWA AS IT MOVES OFF THE HIGHER TERRAIN. AGEOSTROPHIC ADJUSTMENT TO THE BREAKDOWN OF THE RIDGE WILL CAUSE 700MB WINDS TO BECOME SOUTHWESTERLY AND INCREASE TO AOA 30KTS.
538 PM EDT TUE AUG 25 2015 COOLER CONDITIONS AND SPARSE SHOWER CHANCES CAN BE EXPECTED UNTIL HIGH PRESSURE BEGINS TO REBUILD FOR THE WEEKEND. COLDER MID-LEVEL AIR WILL CONTINUE TO FLOOD OVER THE CWA OVERNIGHT AS THE UPPER LOW CENTERED OVER NORTHERN ONTARIO MOVES TOWARD WESTERN QUEBEC TONIGHT.
UPPER LEVEL HIGH PRESSURE WILL REMAIN CENTERED TO THE WEST OF THE REGION THE NEXT FEW DAYS.
HIGH PRESSURE CONTINUES FOR THE NEXT 24 HOURS WITH POSSIBLE FOG DEVELOPMENT LATE IN THE PERIOD AT TRI.
309 PM MDT TUE AUG 25 2015 HIGH PRESSURE CENTERED OVER EASTERN CO AND NEW MEXICO WILL FORCE WINDS ALOFT TO BECOME MORE SOUTHERLY. THE THICKENING CLOUDS AHEAD OF THE TROUGH WILL ALSO PRODUCE WARMER LOW TEMPS TONIGHT.
351 PM EDT TUE AUG 25 2015 THE LARGE UPPER LEVEL LOW NORTH OF THE GREAT LAKES WILL CONTINUE TO OPEN UP AND PULL NORTHEAST THROUGH WEDNESDAY NIGHT. THE COOL AND DRY AIR MASS ASSOCIATED WITH THE HIGH PRESSURE SYSTEM WILL CONTINUE TO BRING A TASTE OF EARLY FALL LIKE WEATHER TO THE AREA. DRY FORECAST CONTINUES DESPITE NAM HINTING AT SHOWERS CHANCES WEDNESDAY NIGHT WITH A SHORT WAVE SWINGING THROUGH THE LONG WAVE TROUGH.
Temperatures over most of the CWA trending just a little warmer today than yesterday. SWly flow aloft will prevail over Norcal for the next several days with strong high pressure over the Desert SW/4-Corners area and low pressure centered off the B. with the Nrn extent of the high cloudiness spreading primarily over the SErn zones tonite. Low pressure off the B. We prefer the slower timing of the effects of this digging/developing trof due to the strong Desert SW/4-Corners ridge.
DEW POINTS SHOULD MIX OUT INTO THE LOW 50S THIS AFTERNOON MAKING IT EVEN MORE COMFORTABLE.
230 PM EDT TUE AUG 25 2015 HIGH PRESSURE OVER THE CENTRAL UNITED STATES WILL SLOWLY MOVE EAST OVER THE NEXT SEVERAL DAYS.
The 1 pm EDT regional surface analysis showed a cold front extending southwestward from a weak frontal wave along the SC-GA border, through Albany, GA, through just west of Quincy, FL, then west- southwestward to the LA coast. Vapor imagery and upper air data showed a long wave trough over much of the eastern CONUS, with an upper level +PV anomaly over central MS & AL. This short wave will translate through our region later tonight, as will the surface cold front. This will likely occur as the synoptic cold front interacts with the FL Big Bend sea breeze front, which was just beginning to develop at the coast.
136 PM EDT TUE AUG 25 2015 THE MAIN FOCUS FOR SHOWERS AND ISOLATED STORMS TODAY WILL BE OVER THE EASTERN HALF OF VERMONT TODAY AS A COLD FRONT MOVES ACROSS THIS AREA.
SOME VIRGA TO LIGHT SHOWERS HAVE BEEN DEVELOPING OVER THE BEARTOOTH ABSAROKAS THIS MORNING AND AFTERNOON AS A POCKET OF MOISTURE WAS ROUNDING THE EDGE OF THE RIDGE THAT HAS BEEN OVER THE AREA THE PAST FEW DAYS. THAT WILL THEN TRACK ACROSS WYOMING AROUND THE EDGE OF THE RIDGE TOMORROW.
227 PM EDT TUE AUG 25 2015 AN UNSEASONABLE STRONG UPPER TROUGH WILL DOMINATE THE WEATHER PATTERN OVER PENNSYLVANIA TODAY THROUGH THE REMAINDER OF THIS WEEK WITH MAINLY DRY AND COOLER THAN NORMAL CONDITIONS. THE ANOMALOUS UPPER TROUGH MOVING THROUGH SOUTHERN CANADA IS LEADING TO INCREASING CYCLONIC FLOW AND FALLING HEIGHTS ALOFT. THE LOWS WILL AVERAGE 2 TO 5 DEG BELOW NORMAL. IT'S HARD TO BUY OFF ON THE HIGH SREF POPS. WITH THE LOWER GEFS CHANCE POPS LOOKING MORE REASONABLE. THE REST OF CENTRAL AND SOUTHERN PA WILL SEE MORE OF A MIX OF SUN AND CLOUDS WITH PERHAPS A SPRINKLE SNEAKING OUT OF THE HIGHER TERRAIN. AS THE EARLY WEEK/DEEP UPPER TROUGH FILLS AND LIFTS NE ACROSS SRN QUEBEC.
THE COLD FRONT CONTINUES TO BACKDOOR INTO NE AND DEEP EAST TX FROM NEAR A MOUNT PLEASANT.
DRY AIR IN THE LOW LEVELS OF THE ATMOSPHERE WILL CONTINUE TO WORK IN FROM THE EAST THROUGH WEDNESDAY AND RESULT IN VFR CONDITIONS.
THESE CLOUDS ARE ASSOCIATED WITH MOISTURE WRAPPING AROUND A CLOSED LOW LOCATED JUST NORTH OF GEORGIAN BAY IN EASTERN ONTARIO. WITH A BLOCKING HIGH LOCATED OVER NEWFOUNDLAND.
WITH NO STRONG SIGNAL FOR BACKING WINDS OR BUILDING HIGH PRESSURE, STRATUS WILL PERSIST THROUGH THE FORECAST PERIOD. PLENTY OF LOW LEVEL MOISTURE WRAPPED AROUND THIS LOW IS PRODUCING LARGE STRATUS DECK OVER THE GREAT LAKES. LOWS TONIGHT MAINLY LOW TO MID 50S UPPER LEVEL TROUGH AXIS WILL SLOWLY CLEAR THE CENTRAL GREAT LAKES TOMORROW.
1233 PM CDT TUE AUG 25 2015 GRADUAL INCREASE IN RIDGING ALOFT OVER THE NEXT 24 HOURS WILL DO LITTLE TO CAUSE A DEVIATION FROM THE QUIET AND EXTREMELY PLEASANT CONDITIONS ACROSS THE AREA. ADDED BONUS TODAY WILL BE LIGHT WINDS NEAR THE RIDGE AXIS. STILL SEEING SOME PRETTY SIGNIFICANT DIFFERENCES IN THE LOCATION OF THE UPPER LOW AND SURFACE BOUNDARIES WHICH SPELL SOME MAJOR DIFFERENCES IN PRECIPITATION FOCUS. GFS AND NAM ARE FURTHER NORTH WITH THE LOW CENTER. TAKING THE UPPER LOW AND WARM FRONT THROUGH THE FORECAST AREA. THE CANADIAN AND EUROPEAN HOWEVER BRING THE LOW CLOSER TO THE I80 CORRIDOR WHICH WOULD RESULT IN A MUCH DRIER FORECAST FOR THE NORTHERN HALF OF THE FORECAST AREA.
352 PM EDT TUE AUG 25 2015 AN UNSEASONABLE STRONG UPPER TROUGH WILL DOMINATE THE WEATHER PATTERN OVER PENNSYLVANIA TODAY THROUGH THE REMAINDER OF THIS WEEK WITH MAINLY DRY AND COOLER THAN NORMAL CONDITIONS. THE ANOMALOUS UPPER TROUGH MOVING THROUGH SOUTHERN CANADA IS LEADING TO INCREASING CYCLONIC FLOW AND FALLING HEIGHTS ALOFT. THE LOWS WILL AVERAGE 2 TO 5 DEG BELOW NORMAL. IT'S HARD TO BUY OFF ON THE HIGH SREF POPS. WITH THE LOWER GEFS CHANCE POPS LOOKING MORE REASONABLE. THE REST OF CENTRAL AND SOUTHERN PA WILL SEE MORE OF A MIX OF SUN AND CLOUDS WITH PERHAPS A SPRINKLE SNEAKING OUT OF THE HIGHER TERRAIN.
300 PM EDT TUE AUG 25 2015 THE LARGE UPPER LEVEL LOW NORTH OF THE GREAT LAKES WILL CONTINUE TO OPEN UP AND PULL NORTHEAST THROUGH WEDNESDAY NIGHT. THE COOL AND DRY AIR MASS ASSOCIATED WITH THE HIGH PRESSURE SYSTEM WILL CONTINUE TO BRING A TASTE OF EARLY FALL LIKE WEATHER TO THE AREA. DRY FORECAST CONTINUES DESPITE NAM HINTING AT SHOWERS CHANCES WEDNESDAY NIGHT WITH A SHORT WAVE SWINGING THROUGH THE LONG WAVE TROUGH.
218 PM EDT TUE AUG 25 2015 AN UPPER LEVEL LOW PRESSURE SYSTEM WILL LINGER ACROSS THE AREA THROUGH WEDNESDAY.
THEN SPREADING INLAND SUN/MON WITH THE APPROACH/PASSAGE OF AN INVERTED TROF/TUTT LOW FROM THE GULF.