Aikyam-Lab/Synoptic-Bench huggingface dataset:
Periods of dense fog, possibly freezing on elevated surfaces, will continue through the next few hours until mixing overcomes the moisture advection. Moisture will likely wrap around the back side of the low on Wednesday afternoon making showers a continued possibility throughout the daylight hours; however, temperatures aloft will be too slow to cool for any wintry precipitation to mix in.
A WARM FRONT WILL BEGIN LIFTING NORTHEASTWARD IMPACTING CENTRAL OREGON THIS AFTERNOON AND EVENING THEN REST OF THE FORECAST AREA OVERNIGHT AND WEDNESDAY. THE NEXT PACIFIC SYSTEM IS STILL EXPECTED TO PUSH A WARM FRONT ACROSS THE REGION FROM SOUTHWEST TO NORTHEAST LATE THIS AFTERNOON THROUGH EARLY WEDNESDAY MORNING. SOUTHWEST TO WEST FLOW BEHIND THE WARM FRONT WILL KEEP SNOW OCCURRING ALONG THE CASCADE EAST SLOPES AND OVER THE INTERIOR MOUNTAINS INTO WEDNESDAY NIGHT.
BELIEVE THERE WILL BE A PERIOD OF SIGNIFICANT SNOWFALL FROM SUNRISE TO A BIT BEFORE NOON AS THE BEST TROUGH AND JET INFLUENCES COMBINE. ANOTHER WEAKER TROUGH WILL RIDE OVER THE AREA LATE THIS AFTERNOON UNTIL ABOUT SUNSET WHICH SHOULD PRODUCE ANOTHER MAXIMA OF PRECIP. THEN AS TROUGH DYNAMICS SLIDE EAST.
The strong low pressure system that brought moderate to heavy snow for many areas across northwest Montana overnight has now weakened and moved off to our east.
LEE TROUGHING EXTENDS FROM EASTERN CO INTO CENTRAL/WESTERN SD WITH DECENT RETURN FLOW EAST OF THE TROUGH. WITH TEMPS REMAINING ABOVE FREEZING. OUR MAIN WEATHER MAKING UPPER TROUGH WILL THEN START TO DIG OVER THE DESERT SW FRI INTO FRI NIGHT. THE UPPER LOW WILL BE DIGGING OVER THE DESERT SW WITH IT MOVING OUT OVER WEST TX BY SUN AFTERNOON. THERE WILL BE A VERY WELL DEVELOPED TROWAL ON THE BACKSIDE OF THE LOW WHICH WILL BE ASSOCIATED WITH THE HEAVY SNOW POTENTIAL. A COLD FRONT WILL BE MOVING THROUGH THE STATE.
BUT GIVEN THE HIGH SNOWFALL RATES DURING MID-LATE AFTERNOON (END OF SCHOOL DAY AND EVENING COMMUTE) THE TRAVEL IMPACTS WILL BE SIGNIFICANT.
500 PM EST TUE DEC 22 2015 DRYING BEHIND A COLD FRONT MADE IT TO THE EDGE OF THE JKL FORECAST AREA BEFORE LOSING MOMENTUM. A TRAILING COLD FRONT WILL MOVE EAST THROUGH KY ON WEDNESDAY NIGHT.
TEMPERATURES CURRENTLY RANGE IN THE LOWER TO MIDDLE 60S, WITH DEWPOINTS HOVERING AROUND THE 60-DEGREE MARK. (FOR REFERENCE, NORMAL TEMPS THIS TIME OF YEAR ARE: HIGHS IN THE LOWER 50S AND LOWS IN THE LOWER 30S). THERE ARE A FEW BREAKS IN THE LOW CIGS/VIS WEST OF THE MSL TERMINAL BUT EXPECTING THE BREAKS TO FILL IN IN THE NEXT HOUR OR SO. A LOW PRESSURE SYSTEM AND FRONTAL BOUNDARY ARE EXPECTED TO LIFT NORTH AFTER 00Z THIS EVENING.
An area of low pressure and associated frontal boundary is forecast to move into and through the region overnight tonight and Wednesday morning. MVFR ceilings will become possible over the CWA late this evening as the low approaches. the freezing fog advisory was allowed to expire mid morning.
The low level south/southwest flow turns southeasterly by later today into tonight, which could reposition the focus for that stratus/fog further northwest. The low level south/southwest flow into the moisture will allow for some stratus and fog.
1126 AM CST TUE DEC 22 2015 AT H5 BROAD TROUGH ACROSS NORTHERN TIER OF LOWER 48 WITH UPPER HIGH OVER THE GULF. AT THE SURFACE WARM FRONT LIFTING OVER NEBRASKA AND TRAILING COLD FRONT FROM BLACK HILLS SOUTHWEST INTO GREAT BASIN. TEMPERATURES INT THE MID 40S TODAY WITH SLIGHTLY COOLER OVER THE SNOW FIELD TO THE WEST IN THE LOWER 40S.
ALLOWING FOR THE CLOUD DECK TO SCATTER OUT AS A WEAK COLD FRONT SKIRTS THE REGION. WHICH KEEPS US JUST EAST OF THE BOUNDARY IN THE WARMER SOUTHWESTERLY FLOW. WILL KEEP CHANCE POPS IN ZONES SOUTH OF I-70 DEEPENING TROUGH OVER THE MIDWEST WILL SUPPORT STRENGTHENING WARM SOUTHERLY FLOW AND MOISTURE OVER THE REGION ON WEDNESDAY. WITH THE FOCUS FOR THE HIGHEST RAINFALL AMOUNTS EAST OF THE OH/PA BORDER. MOISTURE AND WARM TEMPERATURES WILL CONTINUE TO BE THE STORY THROUGH CHRISTMAS EVE AT WHICH POINT LOW PRESSURE. WILL SWING A COLD FRONT TOWARD THE REGION.
SNOW SHOWERS WILL REMAIN OVER THE HIGHER ELEVATIONS INTO THE EVENING HOURS. THE SNOW OVER OUR EASTERN COUNTIES WILL SLOWLY DWINDLE BUT REMAIN PRETTY STEADY IN THE HIGHLANDS WITH SOME ADDITIONAL UPSLOPE POSSIBLE FROM AROUND POCATELLO UP THROUGH ASHTON. THEY WILL BE STRONGEST ACROSS THE REST OF THE HIGHLANDS AND SNAKE PLAIN. ESPECIALLY ACROSS THE LOWER SNAKE PLAIN.
the freezing fog advisory was allowed to expire mid morning.
GUSTS OF 30 TO 35KTS OUT OF THE SOUTHWEST WILL PERSIST THROUGH THE EVENING BEFORE A COLD FRONT MOVES IN. /ISSUED 430 AM CST TUE DEC 22 2015/ A LONG WAVE TROUGH OVER THE ROCKIES WILL MOVE SLOWLY EAST THROUGH WEDNESDAY AND WEDNESDAY NIGHT. SLIGHTLY COOLER WEDNESDAY AND MORE SEASONABLE CONDITIONS CHRISTMAS EVE AS A REINFORCING SURGE OF COLDER AIR ADVECTS INTO THE PANHANDLES. A DEVELOPING WINTER STORM OVER THE CENTRAL AND SOUTHERN ROCKIES CHRISTMAS DAY WITH UPPER TROUGH APPROACHING FROM THE GREAT BASIN.
The mountains along the Montana/Idaho border will once again receive the heaviest snow, as the higher terrain could get another 10 to 12 inches of snow by Wednesday night.
BEFORE RETURNING BACK N AS A WARM FRONT THIS AFTERNOON/EVENING. /ISSUED 522 AM CST TUE DEC 22 2015/ A STATIONARY FRONTAL BOUNDARY IS SNAKING OVER THE FOUR STATE AREA WITH DENSE FOG IN THE COOL AIR OVER WARMER GROUND. SOME VALLEY FOG IS THICK FROM TEXARKANA TO SHREVEPORT AND HUGGING THE LOWER ELEVATIONS OF TERRAIN. THIS NEXT COLD FRONT WILL PUSH DEEPER INTO THE FOUR STATE AREA. THE WARM FRONT SHOULD LIFT TO OUR NORTH JUST ENOUGH TO KEEP THE THREAT OF FLOODING UPSTREAM. THE COLD FRONT AND CLOSED LOW WILL WRAP UP AND MOVE THROUGH RATHER PROGRESSIVELY FOR OUR AREA FROM WEST TO EAST AND SHOULD LIMIT DURATION OF RAINFALL.
Because of strong inversion initially, it will be harder for warmer air aloft to mix down today, so went with a blend of the warmer MAV and cooler MET, upper 40s far north to the mid 50s over central and southern MO.
WITH AN UPPER TROUGH ACROSS THE CENTRAL U. AND RIDGE ALONG THE ATLANTIC COAST. A COLD FRONT.
09Z SURFACE ANALYSIS THIS MORNING PLACES A WEAKENING COLD FRONT JUST EAST OF THE MISSISSIPPI RIVER THIS MORNING.
AN AREA OF LOW PRESSURE CURRENTLY OVER MONTANA WILL TRACK ACROSS NORTH DAKOTA TODAY. THE HI-RES ARW/NMM ARE SUGGESTING LIGHT SNOW COULD BE POSSIBLE LATE TONIGHT AND THROUGH THE MORNING HOURS ON WEDNESDAY WITH THE PASSAGE OF A COLD FRONT.
137 PM CST TUE DEC 22 2015 INTERESTING PATTERN SETTING UP TONIGHT AS NRN/SRN VORT MAXES EMBEDDED WITHIN A LONGWAVE TROF INDUCE SFC REFLECTIONS.
Gusty southwesterly to westerly winds will affect all area terminals this afternoon, but will continue tonight behind a Pacific cold front moving eastward across the region. /issued 500 AM CST TUE DEC 22 2015/ WV imagery shows a fairly progressive pattern in play across the CONUS, w/West Texas and Southeast New Mexico under zonal flow aloft as an upper trough moves thru the region today.
1023 AM MST TUE DEC 22 2015 WESTERLY FLOW WILL BECOME SOUTHWESTERLY TODAY AHEAD OF A TROUGH THAT WILL MOVE THROUGH THE NORTHERN AND CENTRAL PLAINS TONIGHT THROUGH WEDNESDAY MORNING.
THE RECORD IS WARMER FOR MADISON. HIGH LOW PRESSURE WILL LIFT NORTH OUT OF WISCONSIN WED NIGHT. COOLER AIR WILL THEN MOVE IN BEHIND THIS SYSTEM.
344 PM CST TUE DEC 22 2015 BROAD UPPER TROUGHING CENTERED JUST EAST OF THE CONTINENTAL DIVIDE THIS AFTERNOON IS SET TO REACH THE SOUTH PLAINS OVERNIGHT. A DIFFUSE PACIFIC FRONT WILL ACCOMPANY THE PASSAGE OF THE UPPER TROUGH LATE TONIGHT BEFORE WAFFLING IN AN EAST-WEST FASHION OVER THE CWA ON WEDNESDAY. THICK CIRRUS WILL BE LESS OF A NUISCANCE TOMORROW IN THIS POST-TROUGH/DEEPER SUBSIDENCE REGIME. BREEZY WINDS EASE WEDNESDAY EVENING AS BROAD TROUGH AXIS SWINGS WEST TO EAST. HEIGHT INCREASES ALOFT AND SURFACE WESTERLIES HELP KEEP TEMPS WELL ABOVE NORMAL FOR THE REMAINDER OF THE WEEK AS THE STRONG CLOSED LOW THAT WILL BRING STRONG WINDS AND WINTRY WEATHER TAKES SHAPE TO OUR WEST.
PRESSURE FALLS OVER THE HIGH PLAINS TODAY SHOULD BE FELT LOCALLY IN TERMS OF STRONGER WINDS THE NEXT 24 HOURS. WHILE DRIER AIR MIXES INTO THE LOWEST LEVELS. HIGHS TODAY WILL AGAIN REACH THE LOWER 80S.
A COLD FRONT WILL PUSH THROUGH THE AREA ON CHRISTMAS EVE AND BRING COOLER AIR, BUT CHRISTMAS DAY TEMPERATURES WILL CONTINUE TO BE ABOVE AVERAGE. SFC TROF/WRM FNT SWEEPS NWRD AND BECOMES THE FOCAL FOR AN AREA OF RAIN SUPPRTED BY AN UPR JET PASSING THRU. COOLER AIR FILTERS IN BUT CAA IS WEAK SO THERE WILL BE YET ANOTHER DAY OF ABV NRML TEMPS.
1151 AM EST TUE DEC 22 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW A DRY BUT CLOUDY DAY CAN BE EXPECTED TODAY UNDER THE INFLUENCE OF HIGH PRESSURE. A STRENGTHENING AREA OF LOW PRESSURE WILL ORGANIZE OVER THE PLAINS AND PUSH NORTHEASTWARD INTO THE GREAT LAKES TONIGHT INTO WEDNESDAY NIGHT. SLOWED DOWN TEMP RISE OVER NEXT FEW HOURS AS TEMPERATURES HAVE YET TO RESPOND UNDER CLOUD DECK IN SLIGHT COLD ADVECTION BEHIND TROUGH EXITING STATE. STRONG LOW PRESSURE WILL DEVELOP OVER THE CENTRAL PLAINS AND PUSH NORTHEAST ACROSS THE GREAT LAKES.
UPPER LEVEL WESTERN AND CENTRAL CONUS TROUGH TO BEGIN THE PERIOD TO POSSIBLY TRANSITION TO SPLIT FLOW BY THE WEEKEND.
THE 1ST EVENT WILL OCCUR TOMORROW AFTERNOON AND EVENING AS A COLD FRONT APPROACHES OUR AREA FROM THE WEST. THE MOST IMPRESSIVE FEATURE WITH THIS SYSTEM WILL BE THE LOW LEVEL WIND ENERGY AND SHEAR.
VISIBLE SATELLITE AND WEB CAMS INDICATE SCT LOW CLOUDS WEST OF KBZN WITH PERSISTENT OVERCAST LIFTING ONTO THE NEARBY BRIDGER MOUNTAINS.
/ISSUED 245 PM EDT THU APR 30 2015/ DRIER AIR ENTERING SOUTH FLORIDA ON GUSTY W TO NW WINDS AT TIMES, AS DEWPOINTS HAVE DROPPED INTO THE LOW AND MID 60S FROM NORTH TO SOUTH. MUCH COOLER HIGH TEMPS TODAY WILL CONTINUE INTO THE WEEEKEND, IN GREAT CONTRAST TO THE RECORD HEAT WHICH WAS OBSERVED LAST WEEKEND.
SHOWERS AND A FEW THUNDERSTORMS WILL END THIS EVENING AS AN UPPER LOW MOVES AWAY TO THE EAST. HIGH PRESSURE AND UPPER RIDGING WILL THEN BUILD IN WITH A WARM DRY WEEKEND. CENTER OF UPPER LOW WAS ACROSS NORTHEAST KENTUCKY THIS EVENING. EXPECT DRY WEATHER REST OF TONIGHT AS HIGH PRESSURE BUILDS IN JUST WEST OF INDIANA OVERNIGHT. LOW TEMPERATURES WILL RANGE FROM THE UPPER 30S OVER WESTERN SECTIONS TO THE LOWER 40S IN THE EAST. FORECAST CHALLENGES LARGELY FOCUSES ON TEMPS AS HIGH PRESSURE AND RIDGING ALOFT BRING WARMER AIR INTO THE OHIO VALLEY. THE UPPER LOW PASSING THROUGH THE REGION THIS AFTERNOON WILL BRING TO AN END THE LAST 7-10 DAY PERIOD WHICH HAS BEEN HIGHLIGHTED BY A BLOCKY UPPER LEVEL PATTERN OVER THE CONTINENTAL U S AND A PERSISTENT TROUGH OVER THE EASTERN STATES.
THIS IS NOT SURPRISING GIVEN THE DRY AIRMASS IN PLACE AND BUILDING RIDGE OF HIGH PRESSURE. GUIDANCE HAS TRENDED A BIT COOLER WITH LOWS TONIGHT IN THE UPPER 30S TO NEAR 40F AS CLOUDS AND WINDS DIMINISH. DEWPOINTS CURRENTLY IN THE LOW TO MID 30S SO A FEW FAVORED COLD SPOTS LIKE ALTONA COULD GET A BIT COLDER. AN UPPER LOW OVER INDIANA WILL CONTINUE TO TRACK OFF TO OUR EAST OVER THE NEXT 24 HOURS AS HIGH PRESSURE SETTLES OVER CENTRAL ILLINOIS.
843 PM CDT THU APR 30 2015 HIGH PRESSURE SITTING OVERHEAD TONIGHT. ANY LINGERING CLOUDS SHOULD QUICKLY DIMINISH AS UPPER LEVEL RIDGING AND HIGH PRESSURE AT THE SURFACE BUILD IN. JUST A BIT WARMER THAN LAST NIGHT. SKIES SHOULD REMAIN LARGELY CLOUD FREE THROUGH FRIDAY MORNING AND INTO THE EARLY AFTERNOON ALLOWING TEMPERATURES TO SHOOT UP INTO THE LOW 70S AWAY FROM LAKE MICHIGAN AND TO AROUND 60 NEAR THE LAKE. THERE IS A RIBBON OF ELEVATED RH IN THE LOW LEVELS WHICH WILL LIKELY BRING IN SOME SCATTERED CLOUDS FROM THE WEST IN THE LATE AFTERNOON.
EXPECT VFR CONDITIONS WITH MOSTLY CLEAR SKIES AND LIGHT WINDS THROUGH THE PERIOD AS WEAK HIGH PRESSURE RESIDES OVER THE REGION. A LONG WAVE TROUGH DRAPED W-E ACROSS CENTRAL AND S TX. MOSTLY SUNNY SKIES EXPECTED FRI ALONG WITH SLIGHTLY WARMER TEMPS DUE TO AN INCREASINGLY ONSHORE FLOW THROUGH THE AFTERNOON. FRI NIGHT'S LOWS WILL ALSO BE SLIGHTLY WARMER AS THE ATMOSPHERE CONTINUES TO MODIFY AND ONSHORE WINDS ADVECT LOW LEVEL MOISTURE INTO S TX.
810 PM EDT THU APR 30 2015 AS A LARGE UPPER LEVEL SYSTEM SHIFTS SOUTH OF THE LOWER OHIO VALLEY. THE SLOW-EVOLVING DEFORMATION FIELD AROUND THE UPPER LOW THAT SEEMS TO BE DRIVING INTO THE BASE OF THE LONG WAVE TROUGH OVER THE APPALACHIANS IS ALLOWING FOR MUCH MORE MOIST AIR TO INFILTRATE WESTWARD ACROSS THE MOUNTAINS OF CENTRAL PENNSYLVANIA INTO METRO PITTSBURGH AT THIS HOUR. THIS SHOULD ALLOW FOR A GOOD DEAL OF CLEARING OUT BY AFTERNOON EVERYWHERE EXCEPT THE RIDGES.
826 PM EDT THU APR 30 2015 THE COLD FRONT THAT WAS OVER SOUTH FLORIDA THIS AFTERNOON HAS MOVED INTO THE FLORIDA STRAITS THIS EVENING ALLOWING FOR THE DRIER AIR TO WORK INTO SOUTH FLORIDA FROM THE NORTH. WHICH IN TURN WILL ALLOW FOR THE LOWS TONIGHT TO FALL CLOSE TO THE DEW POINTS. /ISSUED 245 PM EDT THU APR 30 2015/ DRIER AIR ENTERING SOUTH FLORIDA ON GUSTY W TO NW WINDS AT TIMES, AS DEWPOINTS HAVE DROPPED INTO THE LOW AND MID 60S FROM NORTH TO SOUTH. MUCH COOLER HIGH TEMPS TODAY WILL CONTINUE INTO THE WEEEKEND, IN GREAT CONTRAST TO THE RECORD HEAT WHICH WAS OBSERVED LAST WEEKEND.
19Z water vapor shows a closed low over IL and a mid level ridge centered over AZ. At the surface, weak ridging extended from the upper Midwest through eastern KS. However this trough axis is also forecast to become less defined as the day progresses. Increasing mid level clouds may limit insolation across the north enough to keep highs in the lower 70s.
1137 PM EDT THU APR 30 2015 AVIATION HIGH PRESSURE WILL BRING FAIR WEATHER THE REMAINDER OF THE WEEK AND INTO MUCH OF THE WEEKEND.
1020 PM CDT THU APR 30 2015 COLD FRONT JUST WEST OF ROSEAU TO NEAR CROOKSTON TO FARGO TO GWINNER. UPPER LEVEL TROUGH OVER MT WILL MOVE ACROSS THE FORECAST AREA TONIGHT. PRECIPITATION WAS GENERALLY IN THE 700 HPA THETA-E RIDGE OR THE GRADIENT. NEXT TROUGH OVER THE GULF OF AK WILL MOVE ACROSS SOUTHERN CANADA ON SUN. TROUGH WILL SEND ANOTHER COLD FRONT ACROSS THE FORECAST AREA SAT AFTERNOON AND SAT NIGHT.
1215 AM EDT FRI MAY 1 2015 HIGH PRESSURE WILL BUILD ACROSS THE REGION OVERNIGHT THROUGH THE WEEKEND. ORGNL FCST: LOW PRESSURE EAST OF THE MARITIMES WILL MOVE EAST TONIGHT. HIGH PRESSURE WILL BUILD ACROSS THE REGION OVERNIGHT THROUGH FRIDAY. MOISTURE WRAPPING AROUND THE LOW WILL GENERALLY KEEP MOSTLY CLOUDY SKIES ACROSS THE REGION TONIGHT. WITH COOLER MID 50S ALONG THE DOWNEAST COAST WHERE ONSHORE WINDS WILL DEVELOP.
631 PM CDT THU APR 30 2015 HIGH PRESSURE FROM LAKE SUPERIOR INTO EASTERN KANSAS WILL DRIFT EAST WITH THE FLOW BECOMING SOUTHEASTERLY OVERNIGHT. ALL FCST SOUNDINGS KEEP THE LOWEST 1 KM FAIRLY DRY EAST OF I-35.
BUT A COLD FRONT IS ON THE HORIZON. THIS FRONT WILL USHERING IN COOLER AND DRIER AIR BUT WILL BE RATHER SHORT LIVED. DEW POINTS MIXED OUT INTO THE LOW 40S IN MANY LOCATIONS AND TEMPS HAVE RISEN INTO THE MID/UPPER 70S. AN UPPER LOW IS SPINNING NEAR THE OHIO VALLEY AND IS SLOWLY PUSHING A WEAK BOUNDARY SOUTHWARD TOWARD THE TENNESSEE VALLEY. FRIDAY WILL BE A BIT COOLER THAN TODAY DUE TO SOME WEAK COLD AIR ADVECTION BEHIND THE DRY FRONTAL BOUNDARY. SFC RIDGING WILL BUILD INTO THE REGION FROM THE NW THIS WEEKEND WITH RISING TEMPS.
/ISSUED 358 PM CDT THU APR 30 2015/ A RIDGE AT 500 HPA WILL CONTINUE TO BUILD EASTWARD OVER THE NEXT SEVERAL DAYS.
1010 PM EDT THU APR 30 2015 PERSISTENT LOW PRESSURE SHIFTS EAST OUT OF THE CANADIAN MARITIMES TONIGHT.
THE SURFACE COLD FRONT WAS LOCATED FROM FAR NORTHEAST NORTH DAKOTA THROUGH LAKE OAHE. A COLD FRONT IS SITUATED FROM AROUND BOTTINEAU TO BISMARCK.
COOL HIGH PRESSURE WILL BUILD INTO THE MIDSOUTH OVERNIGHT WITH LIGHT TO MODERATE NORTHEAST WINDS AND CLEAR SKIES. AN UPPER LEVEL LOW CENTER WAS PIVOTING RAPIDLY SOUTHEAST THIS AFTERNOON THROUGH THE OHIO VALLEY. A FEW SHOWERS ASSOCIATED WITH THE UPPER LEVEL LOW CENTER MAY DEVELOP THIS AFTERNOON GIVEN THE VERY COLD AIR ALOFT ACROSS MIDDLE TENNESSEE. LOWS IN THE MID 40S TO AROUND 50 ARE EXPECTED AS HIGH PRESSURE BUILDS INTO THE MID-SOUTH.
1126 PM CDT THU APR 30 2015 A COLD FRONT IS VERY SLOWLY MOVING SOUTHEAST ACROSS THE PANHANDLE INTO WESTERN SOUTH DAKOTA LATE THIS AFTERNOON. BUT A SMALL CONCENTRATED AREA OF PRECIPITATION COULD RESULT NEAR THE NOSE OF THE LOW LEVEL JET WITHIN AREA OF INCREASING MID LEVEL FRONTOGENESIS. AND 850 MB TEMPERATURES SUPPORT HIGHS IN THE LOW TO MID 70S. A FAIRLY ACTIVE PERIOD IS EXPECTED AS THE UPPER RIDGE BUILDS OVER THE SOUTHWEST U.
809 PM MDT THU APR 30 2015 COLD FRONT JUST PUSHED THROUGH THE DENVER AREA AND CONTINUES TO MARCH SOUTH ACROSS EASTERN COLORADO. AS THE LOW LEVELS CONTINUE TO MOISTEN. THE MAIN COLD FRONT IS STILL UP IN SOUTHEAST WYOMING AND SHOULD MOVE ACROSS NORTHEAST COLORADO LATER THIS EVENING. GUSTY WINDS AT KCYS RIGHT NOW ARE MORE RELATED TO THUNDERSTORM OUTFLOW THAN THE MAIN COLD FRONT. SHOWERS DURING THE EVENING WILL COME TO AN END AS THE COLD FRONT MOVES INTO THE REGION.
600 PM MDT THU APR 30 2015 SHOWERS AND ISOLATED THUNDERSTORMS HAVE DEVELOPED OVER THE HIGHER ELEVATIONS OF SOUTHEAST WYOMING THIS AFTERNOON. THREAT OF SEVERE STORMS IS ON THE LOW SIDE TODAY. SHEAR VALUES WILL BE A BIT STRONGER TOMORROW BUT CAPE VALUES WILL BE ON THE LOWER END. SO AGAIN THE THREAT FOR SEVERE THUNDERSTORMS WILL BE ON THE LOWER SIDE.
942 PM EDT THU APR 30 2015 HIGH PRESSURE WILL BUILD ACROSS THE REGION OVERNIGHT THROUGH THE WEEKEND. ORGNL FCST: LOW PRESSURE EAST OF THE MARITIMES WILL MOVE EAST TONIGHT. HIGH PRESSURE WILL BUILD ACROSS THE REGION OVERNIGHT THROUGH FRIDAY. MOISTURE WRAPPING AROUND THE LOW WILL GENERALLY KEEP MOSTLY CLOUDY SKIES ACROSS THE REGION TONIGHT. WITH COOLER MID 50S ALONG THE DOWNEAST COAST WHERE ONSHORE WINDS WILL DEVELOP.
ESPECIALLY OVER THE HIGHER TERRAIN. TOMORROW TEMPERATURES WILL PEAK ABOUT 15 TO 20 DEGREES ABOVE NORMAL AS A THERMAL TROUGH MOVES INLAND AND 5000 FOOT TEMPERATURES REACH ABOUT 15C.
04 A RIDGE AT 500 HPA WILL CONTINUE TO BUILD EASTWARD OVER THE NEXT SEVERAL DAYS.
720 PM CDT THU APR 30 2015 A WEAK COLD FRONT/TROUGH AXIS WILL MOVE THROUGH THE FORECAST AREA TONIGHT AND EARLY FRIDAY. TOGETHER WITH THE LARGE AMOUNT OF DRY AIR TO BE OVERCOME AT THE LOW LEVELS. THOUGH SOME PLACES ALONG THE NORTH SHORE MAY DIP TO AROUND FREEZING. ON THE SYNOPTIC SCALE MID/UPPER LEVEL FLOW WILL BE GENERALLY WEST-SOUTHWEST THROUGH THE WEEKEND WITH SOUTHWESTERLY FLOW AT LOW LEVELS BRINGING IN MUCH WARMER AIR.
THE COLD FRONT HAS PASSED THROUGH MOST IF NOT ALL OF THE FORECAST AREA WITH TEMPS DROPPING INTO THE MID 50S TO LOWER 60S FARTHER SOUTH. LIGHT SHOWERS/SPRINKLES WERE OCCURRING EARLIER EAST OF I-65 WITH THE FRONTAL PASSAGE AND THE UPPER LOW THAT IS SPINNING OVER KENTUCKY. TEMPERATURES WERE MOSTLY IN THE LOWER 70S. AN APPROACHING COLD FRONT WAS PRODUCING ISOLATED TO SCATTERED SHOWERS OVER CENTRAL KENTUCKY AND MIDDLE TENNESSEE. THE COLD FRONT WILL CONTINUE ITS JOURNEY SOUTHWARD. WITH GUSTS OVER 30 ESPECIALLY IN THE HIGHER. DRIER AND COOLER AIR WILL INVADE THE REGION FROM THE NORTH LATER THIS EVENING AND DURING THE OVERNIGHT. LOW RANGING IN THE LOW/MID 40S. HIGH PRESSURE BUILDING IN FROM CANADA NORTH OF THE GREAT LAKES WILL BUILD SOUTHWARD. BRINGING ANOTHER DOSE OF DRY BUT COOLER THAN NORMAL CONDITIONS TO END THIS WORK WEEK.
730 PM EDT THU APR 30 2015 UPPER LOW WILL BE PULLING AWAY TONIGHT TAKING THE SCATTERED LIGHT RAIN WITH IT. HIGH PRESSURE WILL REPLACE IT FOR FRIDAY. LOW TEMPERATURES TONIGHT WILL RANGE FROM THE MIDDLE 30S IN NORTHWESTERN INDIANA TO THE LOWER 40S IN THE EASTERN PART OF THE REGION. OTRWS SFC RIDGING TO BLD QUICKLY SWD THROUGH THE WRN OH VALLEY W/SUBSTANTIAL LL THERMAL MODERATION XPCD OUTSIDE LAKE SHADOW. MODERATING TREND WILL CONTINUE INTO THIS WEEKEND AS UPPER HEIGHTS BUILD IN WAKE OF TODAY'S UPPER LOW THAT WILL EVENTUALLY OPEN INTO THE WESTERN ATLANTIC.
849 PM EDT THU APR 30 2015 PLEASANT EVENING IN STORE WITH HIGH PRESSURE CONTINUING TO BUILD IN AT THE SFC KEEPING CONDITIONS DRY AND MOSTLY CLEAR. WEAK COLD FRONT WILL PASS THROUGH LATE TONIGHT INTO EARLY TOMORROW MORNING WITH ONLY A FEW CLOUDS AND LIGHT WINDS TO ACCOMPANY IT. WINDS INCREASE SLIGHTLY INTO THE 10-15 KT RANGE TONIGHT THROUGH EARLY TOMORROW MORNING AS DRY COLD FRONT APPROACHES AND PASSES INTO THE COASTAL WATERS FROM THE NORTH.
UPPER LEVEL LOW PULLING EAST ACROSS EASTERN KENTUCKY AND TAKING THE CLOUDS WITH IT.
957 PM CDT THU APR 30 2015 FORECAST FOR THE REMAINDER OF THE NIGHT REMAINS ON TRACK AS THE COLD FRONT HAS EXITED INTO THE RED RIVER VALLEY. THE SURFACE COLD FRONT WAS LOCATED FROM FAR NORTHEAST NORTH DAKOTA THROUGH LAKE OAHE. A COLD FRONT IS SITUATED FROM AROUND BOTTINEAU TO BISMARCK.
WHICH ARE QUITE A BIT COOLER THAN FORECAST DUE TO THE PASSING SHOWERS AND COLD ADVECTION ALOFT. AND THERE COULD BE A FEW MORE REPORTS LIKE THIS THROUGH THE EVENING AS FREEZING LEVELS DROP.
627 PM CDT THU APR 30 2015 WATCHING SEVERAL WEAK SHOWERS WEST RIVER ALONG THE TROF AXIS. HIGH PRESSURE FOLLOWS FOR FRIDAY.
A COLD FRONT HAS MOVED SOUTH THROUGH THE NORTHERN THREE QUARTERS OF WYOMING AND WILL PUSH ON SOUTH INTO NORTHERN COLORADO BY 06Z. AN UPPER LEVEL LOW PRESSURE TROUGH HAS MOVED THROUGH THE NORTHWEST CORNER OF WYOMING AND WILL SWEEP SOUTH AND EAST THROUGH THE STATE THROUGH 06Z. AHEAD OF THE UPPER LEVEL TROUGH. ALONG AND WITHIN 60 MILES NORTH OF THE COLD FRONT. TEMPERATURES WILL COOL BEHIND THE COLD FRONT WITH THE COLDEST TEMPERATURES AROUND SUNRISE FRIDAY MORNING. MOST MOUNTAIN AREAS WILL SEE FREEZING TEMPERATURES ALONG WITH THE WESTERN VALLEYS.
TROUGHING ALOFT. WITH STRONG CYCLONIC CONFLUENT FLOW THROUGH THE LOWER LEVELS HAS PRODUCED LARGE SWATHES OF LIGHT RAIN. SHORT TERM UPDATE (OVERNIGHT) - AS THE TROUGH OVER SOUTH FLORIDA SWINGS EASTWARD IT IS EXPECTED TO DAMPEN CONSIDERABLY. A SUBTLE NOCTURNAL DRAINAGE SURGE IS EXPECTED OFF OF SOUTH FLORIDA DUE TO THE FLOW TURNING NORTH BEHIND THE DISSIPATING TAIL END OF THE TROUGH AND TEMPERATURES OVER SOUTH FLORIDA FALLING INTO THE 60S AND DEW POINTS SAGGING INTO THE LOWER 60S. EXPECT LOWS IN THE LOWER 70S WITH DEW POINTS ONLY SLOWLY FALLING INTO THE MID 60S. WINDS HAVE RELAXED SIGNIFICANTLY ACROSS KEYS WATERS THIS EVENING AS A TROUGH EXTENDING OVER SOUTH FLORIDA WEAKENED.
CIGS MAY DROP TO MVFR AT TRI OVERNIGHT AND THROUGH TOMORROW MORNING AS AN UPPER LEVEL LOW MOVES OVERHEAD AND SHOWERS ADD LOW LEVEL MOISTURE.
933 PM CDT THU APR 30 2015 MOST TEMPERATURES ARE RUNNING A LITTLE WARMER THAN FORECAST. THE DRY AIR WILL REMAIN IN PLACE FOR THE NEXT FEW DAYS AS LOW-LEVEL FLOW REMAINS WEAK AS A WEAK LOW PRESSURE REMAINS ALOFT OVER SOUTH TEXAS. LOWS TONIGHT WILL BE IN THE LOWER 50S. HIGH TEMPERATURES TOMORROW WILL BE A FEW DEGREES HIGHER TOMORROW AS THE LOW LEVEL THERMAL PROFILE SLIGHTLY WARMS.
752 PM EDT THU APR 30 2015 AN UPPER LOW OVER INDIANA WILL SINK SOUTHEAST OVERNIGHT.
630 PM CDT THU APR 30 2015 A COLD FRONT IS VERY SLOWLY MOVING SOUTHEAST ACROSS THE PANHANDLE INTO WESTERN SOUTH DAKOTA LATE THIS AFTERNOON. BUT A SMALL CONCENTRATED AREA OF PRECIPITATION COULD RESULT NEAR THE NOSE OF THE LOW LEVEL JET WITHIN AREA OF INCREASING MID LEVEL FRONTOGENESIS. AND 850 MB TEMPERATURES SUPPORT HIGHS IN THE LOW TO MID 70S. A FAIRLY ACTIVE PERIOD IS EXPECTED AS THE UPPER RIDGE BUILDS OVER THE SOUTHWEST U.
COOLER AND DRIER SURFACE AIRMASS HAS MOVED OVER THE REGION WITH NOTICEABLY PLEASANT SPRING CONDITIONS. HIGH PRESSURE WILL CONTINUE TO SETTLE INTO THE REGION WITH GRADIENT WEAKENING FOR THE COASTAL WATERS OVERNIGHT.
1223 AM EDT FRI MAY 1 2015 PERSISTENT LOW PRESSURE SHIFTS EAST OUT OF THE CANADIAN MARITIMES TONIGHT.
845 PM MST THU APR 30 2015 A RIDGE OF HIGH PRESSURE WILL CONTINUE TO PROVIDE TEMPERATURES WELL ABOVE NORMAL THROUGH FRIDAY. AS THE RIDGE BEGINS TO PUSH TO THE EAST OVER THE WEEKEND A WEAK DISTURBANCE WILL MOVE ACROSS THE REGION.
A WEAK COLD FRONT WILL STALL ACROSS SOUTHERN UTAH OVERNIGHT.
756 PM EDT THU APR 30 2015 AS A LARGE UPPER LEVEL SYSTEM SHIFTS SOUTH OF THE LOWER OHIO VALLEY. THE DEFORMATION FIELD AROUND THE UPPER GYRE SLIDING SOUTHEASTWARD FROM THE LOWER GREAT LAKES INTO THE MIDDLE ATLANTIC SHOULD REORIENT ITSELF RATHER RADICALLY OVERNIGHT GIVEN THE TRENDS OF RECENT MODEL SOLUTIONS. THIS SHOULD ALLOW FOR A GOOD DEAL OF CLEARING OUT BY AFTERNOON EVERYWHERE EXCEPT THE RIDGES.