Aikyam-Lab/Synoptic-Bench huggingface dataset:
MODELS AND OBSERVATIONAL TECHNIQUES REVEAL A DISTURBANCE DROPPING DOWN THROUGH THE MISSOURI VALLEY AT PRESENT ON THE LEE SIDE OF A BUILDING UPPER RIDGE OVER THE SOUTHERN PLAINS. PREVIOUSLY FORECASTED HIGHS FOR TODAY SLIGHTLY WARMER THAN YESTERDAY SEEM ON TRACK. HIGH PRESSURE AT THE SURFACE AND RIDGING ALOFT WILL OVERALL KEEP THE WEATHER QUIET ACROSS THE FORECAST AREA THROUGH THE PERIOD. A DISTURBANCE EMBEDDED IN NORTHWEST FLOW ALOFT COULD BRING SOME LOW-END RAIN CHANCES TO LOCALES PRIMARILY ALONG AND NORTH OF THE HIGHWAY 82 CORRIDOR ON SATURDAY.
1155 AM CDT FRI JUN 5 2015 EARLY MORNING WATER VAPOR IMAGERY TOGETHER WITH GFS 500MB HEIGHTS AND WINDS SHOWS A LONGWAVE TROUGH OFF THE CALIFORNIA COAST. WITH WEAK RIDGING OVER THE CENTRAL CONUS. AND A BROADER TROUGH OFF THE EASTERN COAST. THE HIRES MODELS SUCH AS THE ROOF- ARW/NMM/HOP AND HRRR ALL INDICATE SHOWERS AND PERHAPS EVEN AN ISOLATED THUNDERSTORM DEVELOP ALONG THE BUFFALO RIDGE AROUND 11Z.
A NEBULOUS RIDGE OF HIGH PRESSURE LIES NEAR SOUTH FLORIDA AND THE KEYS.
1149 AM EDT FRI JUN 5 2015 UPDATE TODAY WILL BE CLOUDY AND COOLER COMPARED TO YESTERDAY.
RIDGING AMPLIFIES NORTHWARD ACROSS THE CENTRAL PLAINS TODAY. WHILE A LARGE CLOSED LOW ROTATES OVER SOUTHERN CALI AND NEVADA. BROAD TROUGHING REMAINS ALONG THE ATLANTIC COAST AS THE UPPER LOW THAT HAS SLOWLY CROSSED THE SOUTHEASTERN US BECOMES AN OPEN WAVE. THE RIDGE BEGINS TO DAMPEN AS ENERGY FROM THE WESTERN CLOSED LOW BREAKS OFF AND CROSSES THE NORTHERN PLAINS AND THE MIDWEST. THE CLOSED LOW LIFTS ACROSS THE CENTRAL ROCKIES. REPLACING THE RIDGE ACROSS THE SOUTHEAST WITH TROUGHING.
447 AM EST FRI MAR 11 2016 HIGH PRESSURE WILL MOVE EAST ACROSS THE GREAT LAKES TODAY AND TONIGHT PROVIDING FAIR WEATHER IN OUR AREA. LOW PRESSURE WILL MOVE NORTHEAST INTO THE MIDWEST OVER THE WEEKEND BRINGING AN INCREASING CHANCE OF SHOWERS.
THE RIDGE AXIS MOVES VERY LITTLE WITH SOME ADDITIONAL AMPLIFICATION TO THE NORTH JUST OFFSHORE. THE RIDGE WILL FLATTEN SOME AND NUDGE TO THE EAST AS UPPER LEVEL LOW PRESSURE BEGINS TO MOVE INTO THE CENTRAL GULF REGION. WITH HIGHS IN THE LOWER/MID 80S INLAND AND MID/UPPER 70S COAST.
242 AM EST FRI MAR 11 2016 HIGH PRESSURE WILL CONTINUE TO DOMINATE INTO THE WEEKEND.
343 AM CST FRI MAR 11 2016 THE UPPER LEVEL LOW THAT TOOK AN EARLY SPRING BREAK DEEP INTO MEXICO WAS NOW FINALLY SPINNING ITS WAY NORTHWARD INTO DEEP SOUTH TEXAS AS OF 09Z. THE UPPER LOW IS PROJECTED TO CONTINUE TO LIFT SLOWLY NORTHWARD THROUGH CENTRAL TEXAS OVER THE NEXT 24 HOURS. THIS WILL BRING THE NORTHWEST QUADRANT OF THE UPPER LOW CLOSER TO THE REGION THROUGH THE DAY. THOUGH THEY COULD LINGER IN THE LOW 50S EAST IF THE LOWER CLOUDS CAN HANG ON ALL NIGHT. THE SLOW-MOVING UPPER LOW OVER CENTRAL TEXAS WILL FINALLY LIFT NORTHEAST INTO THE MISSISSIPPI VALLEY JUST IN TIME FOR ANOTHER UPPER LOW TO MOVE IN FROM THE WEST.
359 AM CST FRI MAR 11 2016 AN UPPER RIDGE WILL TRY TO BUILD IN FROM THE NORTH AND WEST TODAY ACROSS THE PANHANDLES AS A CLOSED UPPER LOW OVER SOUTHERN AND CENTRAL TEXAS MOVES NORTH TOWARDS THE RED RIVER VALLEY AND NORTH TEXAS TONIGHT AND SATURDAY. ANOTHER CLOSED UPPER LOW WILL TRACK EAST FROM THE WEST COAST TODAY TO THE FOUR CORNERS REGION SATURDAY.
THE STRONGEST WINDS TONIGHT THROUGH FRIDAY WILL OCCUR OVER THE HIGHER TERRAIN AREAS OF THE SISSETON HILLS. ALONG WITH AN UPPER LEVEL TROUGH WILL BRING SHOWERS TO A GOOD PORTION OF THE CWA SATURDAY NIGHT.
ONLY SLIGHT CHANGE IN ORIENTATION OF DEEP LAYER HIGH PRESSURE RIDGE IS INDICATED. THE MID/UPPER LEVEL HIGH JUST TO OUR EAST WILL NUDGE SLIGHTLY FARTHER SEAWARD. LITTLE CHANGE WITH MIN TEMPS IN THE LOWER 60S. THE RIDGING THAT HAD BEEN DOMINATING THE CENTRAL FLORIDA WEATHER WEAKENS AND SHIFTS EAST AS A WEAKENING MID LEVEL/500MB TROUGH FROM A LOW OVER THE SOUTHERN PLAINS MOVES ACROSS THE NORTHERN GULF OF MEXICO AND FLORIDA SAT AND SUN. THE DEEPENING SOUTHERLY FLOW AHEAD OF BOTH THE SURFACE AND MID LEVEL TROUGHING ADVANCING EASTWARD ACROSS THE GULF OF MEXICO PULLS MOISTURE NORTH INTO CENTRAL FLORIDA.
259 AM EST FRI MAR 11 2016 HIGH PRESSURE WILL BUILD IN FROM THE WEST TODAY AND TONIGHT. THE HIGH WILL SLIDE SOUTH OF THE REGION ON SATURDAY AS A WEAK COLD FRONT PUSHES ACROSS THE STATE.
359 AM EST FRI MAR 11 2016 HIGH PRESSURE WILL BUILD ACROSS THE GREAT LAKES REGION THROUGH THE DAY TODAY.
SO, THE LIFT ASSOCIATED WITH ANY RAINFALL THAT OCCURS WILL LIKELY BE LIMITED TO THE LOWER LEVELS. VFR CONDITIONS SHOULD PREVAIL AFTER 11/20Z, BUT UNCERTAINTY EXISTS WITH THIS FORECAST WITH THE LIFTING OF THE LOW CIGS.
HIGH PRESSURE ACROSS THE MID AND UPPER MISSISSIPPI VALLEY HAS RESULTED IN GRADUALLY CLEARING SKIES. TONIGHT AS THE AREA OF HIGH PRESSURE MOVES EAST WINDS GRADUALLY BECOME SOUTHERLY. WARM AND SUNNY FOR FRIDAY AS SOUTH/SOUTHWEST WINDS AT THE SURFACE AND ALOFT ADVECT WARMER AIR INTO THE REGION. INTERESTING TO NOTE CLOUDS HANGING ON SLIGHTLY LONGER OVER COOLER AREAS SUCH AS LEECH LAKE AND ALONG/NORTH OF THE HIGHWAY 210 CORRIDOR IN CROW WING AND AITKIN COUNTIES WHICH RECEIVED A FRESH 1-2 INCHES OF SNOWFALL YESTERDAY. TONIGHT AS THE HIGH PRESSURE BUILDING ACROSS THE UPPER MIDWEST DRIFTS EAST EXPECT FOG TO DEVELOP. IF IT WERE NOT FOR A TROUGH AXIS THAT SETS UP ACROSS THE AREA WE WOULD BE EVEN WINDIER THAN ON FRIDAY.
258 AM EST FRI MAR 11 2016 A WEAK COLD FRONT IS PRESENTLY DRAPED ROUGHLY ALONG THE I-65 CORRIDOR AS OF 08Z EARLY THIS MORNING. BRINGING WITH IT SOME SLIGHTLY COOLER AIR AND SOME SCATTERED LIGHT RAIN SHOWERS. WITH TEMPERATURES STILL IN THE LOW TO MID 60S OVERNIGHT. IT WILL NOT TAKE MUCH FOR HIGHS TO RETURN TO THE LOW TO PERHAPS MID 70S TOMORROW DESPITE THE WIDESPREAD AND DENSE CLOUD COVER. THE LOW PRESSURE OVER EASTERN TX IS EXPECTED TO WEAKEN AND MOVE NORTH THROUGH THE OHIO VALLEY AS ANOTHER UPPER LEVEL LOW APPROACHES FROM THE PLAINS. THE HIGH PRESSURE OVER THE ATLANTIC WILL MOVE EAST.
357 AM CST FRI MAR 11 2016 Upper low has begun to slowly lift north into South TX and will be responsible for precip chances today through Saturday. The idea of widespread precip w/ generally light precip amounts is consistent with an upper low tracking over the region though not any one time frame should be considered a wash out. The aforementioned upper low will be weakening as it lifts north of the region by Sat night. with attention then turning to a compact wave ejecting ahead of the larger wave trough currently approaching the West Coast.
UPPER LEVEL RIDGE AXIS WILL REMAIN OVERHEAD THROUGH FRIDAY EVENING.
251 AM EST FRI MAR 11 2016 A COLD FRONT WILL MOVE THROUGH EASTERN NORTH CAROLINA THIS AFTERNOON AND EVENING.
1129 PM CST THU MAR 10 2016 HIGH PRESSURE WILL MOVE THROUGH THE AREA OVERNIGHT WITH SOUTH TO SOUTHEAST WINDS DEVELOPING. THIS WILL BRING WARMER LOWS TO THE AREA WITH SOME SPOTS IN THE FAR EASTERN CWA POSSIBLY SEEING A SMALL RISE BEFORE SUNRISE. ONE AREA TO WATCH LATER TONIGHT WILL BE ALONG AND EAST OF THE BUFFALO RIDGE WHERE A LITTLE FOG WILL AGAIN BE POSSIBLE. THE EXCEPTION TO THIS IS ALONG THE BUFFALO RIDGE IN SOUTHWEST MINNESOTA. LEADING WAVE FROM A PIECEMEAL UPPER LEVEL LOW LIFTS NORTH THROUGH THE AREA ON SATURDAY.
/ISSUED 239 PM EST THU MAR 10 2016/ CURRENT SATELLITE LOOP SHOWS MOSTLY SOME FAIR WEATHER CU OVER THE STATE WITH INCREASING CLOUDS OVER AL FROM APPROACHING FRONTAL SYSTEM NOW OVER THE LOWER AND MID MS RIVER VALLEY. LARGE HIGH PRESSURE RIDGE CENTERED JUST OFF THE CAROLINA/GEORGIA COAST CONTINUES TO DOMINATE THE WEATHER PATTERN BUT IT IS WEAKENING FAST. THIS WEAKENING RIDGE IS FINALLY ALLOWING THE FRONTAL SYSTEM THAT HAS CREATED FLOODING ACROSS LA/TX TO MOVE EAST AND WE WILL BEGIN TO SEE SOME SHOWERS AND THUNDERSTORMS FRIDAY. THIS RIDGE STILL TRIES TO KEEP A HOLD OVER GA FRI WHICH SHOULD KEEP THE INSTABILITY INDICES LOW SO ONLY GOING WITH GENERAL THUNDERS FOR NOW. MODELS STILL AGREE THAT THIS BOUNDARY DRIFTS BACK NORTH ON SATURDAY WITH RIDGING DOMINATING MUCH OF THE STATE.
1251 AM EST FRI MAR 11 2016 A COLD FRONT WILL MOVE SOUTHWARD ACROSS THE REGION TONIGHT. DRY AND SLIGHTLY COOLER CONDITIONS ARE IN STORE FOR FRIDAY AND SATURDAY.
CLOSED UPPER LOW BEGINS ITS SLOW TRACK NORTHEASTWARD. THE UPPER LOW OPENS AND FILLS LATE SATURDAY AND SATURDAY NIGHT.
1257 AM EST FRI MAR 11 2016 RAIN WILL END EARLY THIS MORNING AS A COLD FRONT EXITS THE REGION. A DRY AND COOLER DAY. LARGE HIGH PRESSURE WILL MOVE IN FROM THE NORTHWEST. ALTHOUGH TEMPERATURES WILL BE COOLER THAN THE LAST SEVERAL DAYS. A WARM FRONT WILL MOVE NORTHWARD THROUGH THE MID-ATLANTIC REGION SATURDAY. HIGHS ABOUT 20 DEGREES WARMER THAN NORMAL SATURDAY.
343 AM EST FRI MAR 11 2016 HIGH PRESSURE WILL MOVE EAST ACROSS THE GREAT LAKES TODAY AND TONIGHT PROVIDING FAIR WEATHER IN OUR AREA. LOW PRESSURE WILL MOVE NORTHEAST INTO THE MIDWEST OVER THE WEEKEND BRINGING AN INCREASING CHANCE OF SHOWERS.
401 AM EST FRI MAR 11 2016 A COLD FRONT WILL SETTLE SOUTH OF THE COMMONWEALTH TODAY ALLOWING DRIER AIR TO MAKE A RETURN. WHILE IT WILL BE COOLER THAN RECENT DAYS TODAY AND SATURDAY.
THE LOWER SNAKE PLAIN WILL SEE LIGHT RAIN REDEVELOP FRIDAY MORNING AS WELL.
COLD FRONT EXITS TO THE SOUTH TODAY. AND RETURNS LATE TONIGHT AND SATURDAY AS A WARM FRONT.
340 AM CST FRI MAR 11 2016 Early Friday morning, a large upper level low was nearly stationary over far south Texas, but was perhaps beginning to make its move toward the north in advance of another wave moving on to the west coast and ridging in the southeast CONUS. Temperatures have held a bit warmer overnight, in the 40s for most locations, and will provide a warm start to the day with ample sunshine expected. The upper low will continue its shift to the north through the day and into tonight, with increased moisture making its way into the area by this evening.
429 AM EST FRI MAR 11 2016 HIGH PRESSURE WILL SETTLE ACROSS THE REGION FOR TODAY AND AT LEAST THE FIRST PART OF SATURDAY. A BACKDOOR COLD FRONT WILL NEAR THE AREA LATE SATURDAY. BUT A WEAK LOW MOVING UP THE MISSISSIPPI VALLEY TOWARD THE LOWER GREAT LAKES WILL TAKE THE FRONT BACK NORTHEAST.
418 AM EST FRI MAR 11 2016 HIGH PRESSURE CENTERED OFF THE SOUTHEAST COAST WILL DIRECT A WARM SOUTH FLOW INTO THE FORECAST AREA THROUGH SATURDAY. A COLD FRONT APPROACHING FROM THE NORTH WILL STALL NEAR THE NORTH CAROLINA BORDER FRIDAY.
Dry air will continue to filter into the area from the north tonight, as high pressure pushes east across the Great Lakes. By Friday, high pressure will push east into the eastern Great Lakes and eventually New England. At the same time, the upper low that has been spinning over northern Mexico for several days will finally start to (slowly) move north across the Gulf Coast. Shower/thunderstorm chances then continue Friday night through Saturday night before the upper low passes through the area.
THE 500 MB CLOSED LOW WILL CONTINUE TO MOVE OUT OT THE NORTH AND NORTHEAST ACROSS SOUTHERN TX THROUGHOUT TONIGHT AND FRIDAY. WITH UPPER LOW IN THE VICINITY CLOUD FEATURES WILL VARY WILDLY DURING THE NEXT 12 HOURS. BUT CURRENT STORMS WILL CONTINUE TO SPIN NEAR THE CENTER OF THE TROUGH CENTERED ON THE WESTERN VALLEY. FINALLY THE UPPER LOW THAT HAS TAKEN UP RESIDENCE IN MEXICO THE LAST SEVERAL DAYS LIFTS NORTHEAST OUT OF TEXAS AND RAPIDLY FILLS IN.
WITH -DZ/-RA/-TSRA EXPECTED TO DEVELOP DURING THE TAF PERIOD AND MOVE NORTHWARD AS A CLOSED LOW MOVES VERY SLOWLY TO THE NE ACROSS CENTRAL TEXAS.
434 AM EST FRI MAR 11 2016 A COLD FRONT WILL SETTLE SOUTH OF THE COMMONWEALTH TODAY ALLOWING DRIER AIR TO MAKE A RETURN. WHILE IT WILL BE COOLER THAN RECENT DAYS TODAY AND SATURDAY.
140 AM EST FRI MAR 11 2016 HIGH PRESSURE CENTERED OFF THE SOUTHEAST COAST WILL DIRECT A WARM SOUTH FLOW INTO THE FORECAST AREA THROUGH SATURDAY. A COLD FRONT APPROACHING FROM THE NORTH WILL STALL NEAR THE NORTH CAROLINA BORDER FRIDAY.
High pressure ridge axis building overhead, delivering a delightful day to SW KS. High pressure ridge axis, with very dry air and few clouds, will remain firmly planted over Kansas. Closed low over N TX at 6 AM Saturday will open up into a negatively-tilted trough as it moves north into Oklahoma Saturday afternoon. 12z ECMWF remains consistent, spreading the cyclone's deformation zone and light rain showers into the SE zones Friday night through Saturday morning. Forcing for precipitation in the deformation zone weakens as the cyclone loses its circulation. Thick cloud cover will spread over SW KS Saturday morning, providing much milder lows in the lower 40s. Highs Saturday a few notches cooler under the clouds, in the low to mid 60s.
354 AM EST FRI MAR 11 2016 A COLD FRONT WILL DROP SOUTH THROUGH THE REGION THIS MORNING. HIGH PRESSURE RETURNS TONIGHT INTO SATURDAY.
A WEAK COLD FRONT ASSOCIATED WITH AN APPROACHING TROF HAS SHIFTED WINDS SLIGHTLY AND IS BRINGING COOLER AIR INTO THE REGION. A WEAK COLD FRONT IS MOVING ACROSS CENTRAL MONTANA WITH A FEW RAIN AND SNOW SHOWERS DEVELOPING AT KHLN.
THE PACIFIC NORTHWEST REMAINS UNDER STRONG SOUTHWEST FLOW ALOFT BETWEEN AN OFFSHORE LONG WAVE TROUGH AND THE AFOREMENTIONED REX BLOCK OVER THE CENTRAL U. SHORT WAVES EJECTED BY THE OFFSHORE TROUGH WILL BRING CONTINUED ROUNDS OF WIND AND PRECIPITATION TO THE AREA.
A LARGE AREA OF HIGH PRESSURE IS CENTERED NORTHEAST OF THE BAHAMAS WITH THE RIDGE AXIS EXTENDING ACROSS THE FLORIDA PENINSULA. THE PRESSURE GRADIENT BETWEEN THE RIDGE IN THE EAST AND THE LOW TO THE WEST IS QUITE STRONG. THE UPPER LOW OVER TEXAS WILL FINALLY BE PICKED UP BY AN APPROACHING LONG WAVE TROUGH. THIS TROUGH WILL MOVE OVER THE EASTERN GULF OF MEXICO BY SATURDAY AFTERNOON. THE RIDGE NORTHEAST OF THE BAHAMAS WILL MOVE OUT OVER THE CENTRAL ATLANTIC AHEAD OF THE TROUGH RESULTING IN DECREASING WINDS THROUGH SATURDAY NIGHT.
LARGER UPPER LOW MOVING ACROSS SOUTH TEXAS CONTINUES TO STREAM CLOUDS AND BOUNDARY LAYER MOISTURE GENERALLY JUST EAST OF THE FORECAST AREA. AS THE UPPER LOW TO THE SOUTH CONTINUES TO LIFT NORTHWARD THROUGH THE DAY ON FRIDAY. TRACK OF THE LOW IS A LITTLE SLOWER AND EXPECT RAIN TO HOLD OFF UNTIL LATE AFTERNOON AND POSSIBLY INTO THE EVENING HOURS. THE SYSTEM IS OF WARMER ORIGIN AND HIGHS SHOULD STILL REACH LOW 60S CENTRAL TO UPPER 60S IN THE SOUTHEAST.
HIGH PRESSURE WILL MOVE INTO THE REGION TODAY WITH GRADUAL LIFTING OF THE FOG AND LOW CLOUDS WITH SOME SUN RETURNING IN THE AFTERNOON WITH HIGHS IN THE 40S. HIGH PRESSURE WILL BE OVER THE AREA THROUGH THE WEEKEND WITH TEMPERATURES BACK UP INTO THE 50S.
347 AM CST FRI MAR 11 2016 THE RAP MODEL SUGGESTS DEEP MIXING ACROSS NRN NEB THIS AFTN WITH THE APPROACH OF A WEAK COLD FRONT.
01 UTC surface analysis shows the primary area of low pressure back to the west along the upper Texas coast with a frontal zone extending northeastward across the Tennessee River Valley. High pressure is still centered east of the Florida Peninsula, with our region in between these two significant features. The anomalously-strong deep-layer ridge along the Southeast coast will finally break down Saturday and Saturday night, as the upper- level trough which has been affecting the western Gulf Coast states lifts northeastward. Despite the weakening Q-G forcing associated with the trough, there will be enough deep layer moisture and ascent for a good chance of rain Saturday night, mainly west of Tallahassee and Albany. Temperatures will remain warm, especially the daytime highs across north FL and south GA, where highs will be in the lower to mid 80s.
1243 AM EST FRI MAR 11 2016 HIGH PRESSURE CENTERED OFF THE SOUTHEAST COAST WILL DIRECT A WARM SOUTH FLOW INTO THE FORECAST AREA THROUGH SATURDAY. A COLD FRONT APPROACHING FROM THE NORTH WILL STALL NEAR THE NORTH CAROLINA BORDER FRIDAY. THE FRONT WILL BEGIN MOVING BACK NORTH AS A WARM FRONT SATURDAY.
340 AM CST FRI MAR 11 2016 FAIRLY ACTIVE UPPER PATTERN OVER THE CONUS WITH A STRONG CUTOFF LOW OVER SRN TX WITH A SECOND UPPER TROUGH MOVING ONSHORE ALONG THE WEST COAST. HIGH PRESSURE OVER ERN IOWA WILL CONTINUE TO DRIFT EWD INTO THE GREAT LAKES WITH A BREEZY SLY RETURN FLOW ALREADY COMMENCING OVER THE NRN PLAINS. THE FIRST WILL ARRIVE IN THE FORM OF A DISJOINTED MID/UPPER LEVEL TROUGH MOVING ACROSS THE REGION THIS WEEKEND. THIS TROUGH WILL GENERATE PERSISTENT CLOUDS AND SOME RAIN ACROSS IOWA.
Unsettled Weather This Weekend And Warmer Weather On The The big upper level storm system across the Rio Grande Valley near South Texas will begin to move northward today through the weekend. The center of the upper level low will be near the Red River Valley by Saturday morning and continuing to spiral northward towards the Midwest.
401 AM EST FRI MAR 11 2016 NOTICEABLY COOLER AIR WILL OVERSPREAD THE REGION TODAY. LARGE HIGH PRESSURE WILL MOVE IN FROM THE NORTHWEST. ALTHOUGH TEMPERATURES WILL BE COOLER THAN THE LAST SEVERAL DAYS. A WARM FRONT WILL MOVE NORTHWARD THROUGH THE MID-ATLANTIC REGION SATURDAY. HIGHS ABOUT 20 DEGREES WARMER THAN NORMAL SATURDAY.
855 PM PST THU MAR 10 2016 A QUICK MOVING LOW PRESSURE TROUGH WILL PUSH ACROSS SW CA FRIDAY AFTERNOON THROUGH EARLY SATURDAY. SNOW TO THE HIGHER TERRAIN. AND A BRIEF PERIOD OF GUSTY SOUTHWESTERLY WINDS TO THE MOUNTAIN RIDGE TOPS AND DESERTS.
/ISSUED 317 AM CDT Thu Apr 30 2015/ Light winds, clear skies and cool surface ridging in place once again tonight however low temps will not be quite as cool as last night. Upper ridging will begin to move overhead Friday and the warming trend will continue with above normals temps expected through the weekend.
TEMPERATURES ON THE PLAINS ARE ALREADY INTO THE LOWER 70S. THE SURFACE COLD FRONT IS STILL NOT EXPECTED TO ARRIVE UNTIL AFTER 6 PM. HIGH PRESSURE RIDGE ALOFT STILL IN CONTROL OVER COLORADO EARLY THIS MORNING BUT WE ARE LOOKING FOR A CHANGE IN THE WEATHER BY LATER THIS AFTERNOON AND TONIGHT. AN UPPER LEVEL TROF AND COLD FRONT WILL MOVE ACROSS NORTHERN COLORADO LATER THIS AFTERNOON AND NIGHT WITH AN INCREASE CHANCE FOR SHOWERS AND THUNDERSTORMS. EXPECTING THE CLOUDS TO STICK AROUND FOR MOST OF THE DAY TO PRODUCE A COOLER DAY.
1203 PM EDT THU APR 30 2015 PERSISTENT LOW PRESSURE SHIFTS EAST OUT OF THE CANADIAN MARITIMES TODAY AND TONIGHT.
1006 AM CDT THU APR 30 2015 GREAT LAKES UPPER LOW HAS MOVED DOWN INTO INDIANA WITH COLD POOL TEMPS SINKING SOUTH. SHOWERS ASSOCIATED WITH COLD POOL AND UPPER LOW AND CURRENTLY SCATTERED ACROSS EASTERN TWO THIRDS OF KENTUCKY NORTHWARD INTO INDIANA.
637 AM CDT THU APR 30 2015 PCPN CHANCES BEGINNING LATE TONIGHT AND INTO THIS WEEKEND REVOLVING AROUND PAC NW TROF MOVING ALONG THE U. /CAN BORDER AND RELATIVELY WEAK COLD FRONT.
A RIDGE OF HIGH PRESSURE WILL CONTINUE TO PROVIDE TEMPERATURES WELL ABOVE THEIR SEASONAL NORMALS THROUGH FRIDAY. AS THE RIDGE BEGINS TO PUSH TO THE EAST OVER THE WEEKEND A WEAK DISTURBANCE WILL MOVE ACROSS THE REGION.
939 AM EDT THU APR 30 2015 PERSISTENT LOW PRESSURE SHIFTS EAST OUT OF THE CANADIAN MARITIMES TODAY AND TONIGHT.
1004 AM CDT THU APR 30 2015 WATER VAPOR LOOP INDICATED AN UPPER LEVEL TROUGH OVER SOUTHERN SASK WITH A SHORT WAVE ALONG THE MT/WY BORDER. COLD FRONT WAS OVER EASTERN MT. PRECIP WAS ORIENTATED ALONG THE 700 HPA THETA-E RIDGE AXIS. UPPER RIDGE WILL FLATTEN AS AN UPPER TROUGH APPROACHES THE REGION. AS THE UPPER TROUGH MOVES THROUGH THE REGION THERE WILL BE SHOWERS.
649 AM CDT THU APR 30 2015 A RIDGE OF HIGH PRESSURE WILL PROVIDE THE NORTHLAND WITH DRY WEATHER TODAY. WE HAVE THE HIGHEST POPS OVER THE FAR WEST AND LOWEST EAST.
CLOSER TO THE COOLER TEMPERATURES ALOFT. ADJUSTED A FEW SKY AND HOURLY GRIDS TO REFLECT THE WARMER TEMPS AT NOON. NUDGED MAX TEMP GRID UP ALSO BUT ALLOWED FOR COOLER TEMPERATURES BY MID TO LATE AFTERNOON AS CONVECTION POPS ACROSS THE REGION. CHATTANOOGA AIRPORT, TN 74 45 70 49 / 30 20 0 0 KNOXVILLE MCGHEE TYSON AIRPORT, TN 70 45 65 49 / 60 30 10 0 OAK RIDGE, TN 70 45 67 48 / 60 30 10 0 TRI CITIES AIRPORT, TN 68 42 64 45 / 60 60 30 10.
1150 AM CDT Thu Apr 30 2015 High amplitude flow characterized by a 500mb closed low dropping from the Great Lakes today into the Ohio valley tonight, while ridging builds from the desert southwest into the Upper Mississippi River Valley. A weak piece of energy dropping along the west side of the Great Lakes upper low is producing some mid clouds from Illinois back into potions of central and east central Missouri, but are very scattered in nature.
925 AM MDT THU APR 30 2015 TROUGHS ASSOCIATED VORTICITY/AXIS JUST UPSTREAM AND WEST OF OUR FORECAST AREA AT THIS TIME. COLD FRONT WITH GUSTY WINDS CONTINUES TO PUSH EASTWARD ACROSS EASTERN MONTANA EARLY THIS MORNING. BEHIND THE FRONT THE UPPER LEVEL TROF WILL MOVE ACROSS THE AREA THIS MORNING INTO EARLY AFTERNOON.
1205 PM EDT THU APR 30 2015 LOW PRESSURE EAST OF NOVA SCOTIA WILL MOVE EAST TODAY.
COOLER AND DRIER AIR MASS WILL ADVECT IN FROM THE NORTHWEST TODAY. FOLLOWING A WEAK COLD FRONTAL PASSAGE OVERNIGHT.
917 AM EDT THU APR 30 2015 CLOUDS AND SHOWER CHANCES WILL INCREASE THROUGH THE AFTERNOON AS A LARGE UPPER LEVEL SYSTEM SHIFTS ACROSS THE LOWER OHIO VALLEY. UPPER LEVEL LOW CONTINUES DRIFTING SOUTHWARD INTO THE UPPER MIDWEST. POCKETS OF UPPER LEVEL ENERGY AND MOISTURE WILL ROTATE AROUND THE EASTERN SIDE OF THE LOW. MODELS ARE SHOWING MOISTURE INCREASING OVER THE RIDGES THIS MORNING AND THEN SPREADING NORTHWESTWARD AS THE CUTOFF LOW SINKS INTO CENTRAL INDIANA. AS THE ENERGY ROTATING AROUND THE LOW ENCOUNTERS THE INCREASING MOISTURE. AS THE UPPER LOW MOVES INTO THE MID-ATLANTIC REGION TONIGHT.
1037 AM EDT THU APR 30 2015 LOW PRESSURE IN THE UPPER ATMOSPHERE WILL BRING A CHANCE OF SHOWERS TODAY INTO TONIGHT. A LARGE AREA OF HIGH PRESSURE WILL BUILD IN FRIDAY AND WILL REMAIN OVER THE REGION THROUGH THE WEEKEND. THE HIGH WILL BRING A PERIOD OF DRY WEATHER AND GRADUALLY INCREASING TEMPERATURES. UPPER LOW WILL BE MOVING SOUTHEAST THROUGH KENTUCKY TONIGHT AND THEN TO THE EAST COAST ON FRIDAY. WITH HEIGHT RISES SIGNALING A WEAKENING TREND FOR THE UPPER LOW. HIGH PRESSURE AND SUBSIDENCE WILL THEN TAKE OVER THE WEATHER PATTERN.
859 AM PDT THU APR 30 2015 HIGH PRESSURE WILL BRING ABOVE NORMAL TEMPERATURES AND FAIR SKIES INTO FRIDAY. MAX TEMPS WILL BE SIMILAR TO YDY THE BIG QUESTION MARK WILL BE THE AREA WITHIN 5 MILES OF THE COAST WHERE SEA BREEZE EFFECTS WILL BE THE DOMINATE PLAYER LIKELY SOME AREAS WILL BE WARMER AND SOME COOLER. IF THE NAM IS CORRECT THE CENTRAL COAST WILL BE WARMER WITH BETTER OFFSHORE FLOW.
/ISSUED 420 AM CDT THU APR 30 2015/ THE DRY WEATHER PATTERN CONTINUES FOR THE ARKLAMISS WITH HIGH PRESSURE BRINGING MOSTLY CLEAR SKIES AND A CHILLY START TO THE LAST DAY OF APRIL 2015. THIS IS RESPONSIBLE FOR REINFORCING THE EASTERN CONUS LONGWAVE TROUGH AND SENDING MORE COOL AND DRY AIR INTO THE FORECAST AREA AS WE GO INTO FRIDAY. THIS WILL KEEP RAIN CHANCES NEAR ZERO AND TEMPERATURES WILL BE VERY PLEASANT WITH HIGHS IN THE LOWER 80S AND LOWS IN THE 50S. MODELS CONTINUE TO SHOW ANOTHER UPPER TROUGH SWINGING ACROSS THE CENTRAL PLAINS BY MIDWEEK.
AN UPPER LOW WILL DROP OVER THE REGION TODAY BRINGING INCREASING CLOUDS AND A GOOD CHANCE FOR SHOWERS.
VFR SKC CONDITIONS CAN BE EXPECTED THRU THE FCST PERIOD AND BEYOND AS DEEP HIGH PRESSURE ANCHORED OVER AREA. /ISSUED 520 AM CDT THU APR 30 2015/ HIGH PRESSURE ON THE SURFACE AND ALOFT CONTINUED TO SPREAD OVER THE FOUR STATE REGION PROVIDING COOL TEMPERATURES AND DRY CONDITIONS. AROUND THE EASTERN PERIPHERY OF THE UPPER RIDGE. A CLOSED UPPER LOW PRESSURE SYSTEM WILL DRIVE SOUTH ACROSS THE GREAT LAKES AND INTO THE OHIO AND EASTERN TENNESSEE VALLEY. PROVIDING A DRY BACK DOOR COLD FRONT TO MOVE ACROSS THE FOUR STATE AREA. THE RETURNING MOISTURE FROM THE SOUTHERLY WINDS WILL COMBINE WITH DISTURBANCES ASSOCIATED WITH UPPER LEVEL SHORT WAVES IN THE NORTHERN STREAM AND A CLOSED LOW MOVING IN ACROSS THE WESTERN AND SOUTHWEST PARTS OF THE COUNTRY TO BREAK DOWN OUR RIDGE OF HIGH PRESSURE ALOFT AND SHIFTING IT EAST.
1024 AM EDT THU APR 30 2015 LOW PRESSURE EAST OF NOVA SCOTIA WILL MOVE EAST TODAY.
1122 AM EDT THU APR 30 2015 CLOUDS AND SHOWER CHANCES WILL INCREASE THROUGH THE AFTERNOON AS A LARGE UPPER LEVEL SYSTEM SHIFTS ACROSS THE LOWER OHIO VALLEY. AND BANDS OF SHOWERS FAR WEST AND RIDGES HOLDING TEMPERATURES WELL DOWN. UPPER LEVEL LOW CONTINUES DRIFTING SOUTHWARD INTO THE UPPER MIDWEST. POCKETS OF UPPER LEVEL ENERGY AND MOISTURE WILL ROTATE AROUND THE EASTERN SIDE OF THE LOW. MODELS ARE SHOWING MOISTURE INCREASING OVER THE RIDGES AND THEN SPREADING NORTHWESTWARD AS THE CUTOFF LOW SINKS INTO WEST VIRGINIA BY EVENING. AS THE ENERGY ROTATING AROUND THE LOW ENCOUNTERS THE INCREASING MOISTURE. AS THE UPPER LOW MOVES INTO THE MID-ATLANTIC REGION TONIGHT.