Aikyam-Lab/Synoptic-Bench huggingface dataset:
1023 AM EDT MON APR 20 2015 A COLD FRONT CROSSES TODAY. AS A LARGE LOW PRESSURE SYSTEM MOVES NORTH INTO CENTRAL CANADA. THAT LOW WILL KEEP COOLER CANADIAN AIR COMING ALL WEEK. THIS FEATURE WILL EXIT TO THE EAST BY NOONISH AND WE WILL TURN OUR ATTENTION TO THE WEST WITH APPROACHING COLD FRONT. UPPER LEVEL TROUGH. COLD FRONT TO THE EAST OF THE CWA AT THE BEGINNING OF THE PERIOD. WITH COOLER.
952 AM CDT MON APR 20 2015 COOL FRONT MOVED THROUGH EARLY THIS AM WITH TEMPS INTO THE LOW TO MID 60S. FOR THE REGION TODAY SKIES CONTINUING TO CLEAR WITH NORTHERLY WINDS AS HIGH PRESSURE BUILDS DOWN FROM THE NORTH. HIGH PRESSURE WILL BE BUILDING INTO THE REGION TODAY BEHIND A DEPARTING COLD FRONT. COOL NIGHTS AND MILD DAYS INTO TUESDAY AS A CANADIAN COLD FRONT WHICH PUSHED THROUGH THE AREA LAST NIGHT USHERS IN A WELCOME CHANGE FROM THE LAST COUPLE OF WEEKS OF WET AND AT TIMES STORMY CONDITIONS. AS THE HIGH TRUNDLES OFF TO THE EAST TUESDAY NIGHT, GULF MOISTURE RETURNS AS DOES THE SHOWERS AND THUNDERSTORMS OVER THE LATTER HALF OF THE WEEK. COOLER THAN NORMAL TODAY AND TNITE WITH SOME COLD ADVECTION HOLDING TEMPS IN THE 70S UNDER SUNNY SKIES.
1156 AM EDT MON APR 20 2015 HYDRO A CHILLY WEEK IS DEVELOPING AS LOW PRESSURE HAS MOVED OVER THE GREAT LAKES. COOLER AIR WILL FLOW INTO WEST MICHIGAN BEHIND THE LOW. FORECAST CONCERNS CONTINUE TO DEAL WITH THE EVOLUTION OF THE LOW MOVING ACROSS LOWER MICHIGAN. OVERALL COVERAGE THOUGH IS BEGINNING TO DECREASE SOUTH OF THE MI/IN BORDER AS THE LOW MOVES NORTH. TUESDAY THE CORE OF THE UPPER LOW MOVES OVERHEAD.
1050 AM CDT MON APR 20 2015 COLD FRONT CURRENTLY DEPARTING THE AREA OFF TO OUR EAST ALONG WITH SOME LIGHT SHOWERS. /ISSUED 327 AM CDT MON APR 20 2015/ AN UPPER LEVEL TROUGH OVER THE MID SOUTH EARLY THIS MORNING WILL CONTINUE TO MOVE EAST TODAY AS A SURFACE COLD FRONT SWEEPS EAST OF THE REGION AS WELL. COOLER TEMPERATURES CAN BE EXPECTED WITH HIGHS REMAINING SLIGHTLY BELOW SEASONAL AVERAGES. HIGH PRESSURE WILL MOVE ACROSS THE MID SOUTH THROUGH TUESDAY WITH CONTINUED DRY AND SLIGHTLY BELOW AVERAGE TEMPERATURES.
1053 AM EDT MON APR 20 2015 UNSETTLED AND WET WEATHER PATTERN WILL CONTINUE THROUGH TODAY AS A COLD FRONT APPROACHES THE REGION. HIGH PRESSURE WILL BUILD OVER THE AREA TUESDAY.
HIGH PRESSURE ALOFT WILL BUILD EAST ACROSS THE GREAT BASIN TONIGHT THROUGH TUESDAY. THE UPPER RIDGE CURRENTLY OVER THE WEST COAST STATES WILL SHIFT EAST INTO THE GREAT BASIN BY TUESDAY. THE CYCLONIC NORTHWEST FLOW AHEAD OF THE ADVANCING RIDGE WILL USHER A COUPLE OF WEAK VORTICITY LOBES SOUTHEAST THROUGH THE FORECAST AREA.
GUSTY DAY AS A COLD FRONT TRACKS ACROSS THE SOUTHERN APPALACHIAN REGION TODAY. CHATTANOOGA AIRPORT, TN 69 46 71 48 / 40 10 0 0 KNOXVILLE MCGHEE TYSON AIRPORT, TN 72 45 68 45 / 50 20 10 10 OAK RIDGE, TN 70 46 68 47 / 50 10 10 10 TRI CITIES AIRPORT, TN 72 45 65 41 / 60 40 10 20.
/ISSUED 327 AM CDT MON APR 20 2015/ AN UPPER LEVEL TROUGH OVER THE MID SOUTH EARLY THIS MORNING WILL CONTINUE TO MOVE EAST TODAY AS A SURFACE COLD FRONT SWEEPS EAST OF THE REGION AS WELL. COOLER TEMPERATURES CAN BE EXPECTED WITH HIGHS REMAINING SLIGHTLY BELOW SEASONAL AVERAGES. HIGH PRESSURE WILL MOVE ACROSS THE MID SOUTH THROUGH TUESDAY WITH CONTINUED DRY AND SLIGHTLY BELOW AVERAGE TEMPERATURES.
MEANWHILE IT WILL BE MUCH COOLER AT BROOKINGS. THE THERMAL TROUGH PATTERN IS WEAKENING TODAY AND THE COVERAGE AND MAGNITUDE OF GUSTY WINDS HAS DIMINISHED SIGNIFICANTLY FROM YESTERDAY. WINDS AND SEAS WILL INCREASE TUESDAY AFTERNOON AHEAD OF A COLD FRONT.
A HIGH PRESSURE RIDGE WILL BE OVER OVER THE WEST COAST THIS MORNING AND SLOWLY MOVE EAST DURING THE DAY. NORTHWEST FLOW ALOFT WILL BRING IN SCT HIGH CLOUDS THROUGH THE DAY AS HIGH PRESSURE RIDGING SLOWLY BUILDS IN FROM THE WEST.
1023 AM CDT MON APR 20 2015 WITH HIGH PRESSURE BUILDING IN FROM THE NORTHWEST. EVEN WITH THE COOLER AND DRIER AIRMASS IN PLACE. ELEVATED NORTHERLY TO NORTHEASTERLY WINDS EXPECTED TODAY IN THE WAKE OF LAST NIGHT/S COLD FRONT WITH WINDS GENERALLY 10 TO 15 KNOTS AND SOME STRONGER GUSTS NEAR 25 KNOTS POSSIBLE.
THE COLD FRONT RESPONSIBLE FOR THIS ACTIVITY CURRENTLY BISECTS NW AL AND EXTENDS FROM THE ERN GREAT LAKES DOWN INTO SRN MS/LA AND BACK INTO THE WRN GOMEX. WHILE THE STRONG/SEVERE CONVECTION ASSOCIATED WITH THIS BOUNDARY HAS SINCE PUSHED WELL EAST OF THE HUN CWFA, ANOTHER ROUND OF CLOUDS IS TRAVERSING THE AREA RIGHT ALONG THE COLD FRONT ATTM. DEWPOINTS IN THE WAKE OF THE COLD FRONT ARE ALREADY DOWN INTO THE MIDDLE 40S IN MEMPHIS, WITH MIDDLE 30S BEING REPORTED BACK IN CENTRAL AR. CURRENT TEMPS IN THE LOWER/MIDDLE 60S SHOULD ONLY RISE A FEW MORE DEGREES WITH LIMITED INSOLATION EXPECTED, SO AFTN HIGHS WERE ADJUSTED DOWNWARD A FEW DEGREES. ALTHOUGH THE MAIN COLD FRONT REMAINS BACK TO THE W ACROSS WRN TN/N CNTRL MS.
1151 AM EDT MON APR 20 2015 UPDATE A CHILLY WEEK IS DEVELOPING AS LOW PRESSURE HAS MOVED OVER THE GREAT LAKES. COOLER AIR WILL FLOW INTO WEST MICHIGAN BEHIND THE LOW. FORECAST CONCERNS CONTINUE TO DEAL WITH THE EVOLUTION OF THE LOW MOVING ACROSS LOWER MICHIGAN. OVERALL COVERAGE THOUGH IS BEGINNING TO DECREASE SOUTH OF THE MI/IN BORDER AS THE LOW MOVES NORTH. TUESDAY THE CORE OF THE UPPER LOW MOVES OVERHEAD.
HIGH PRESSURE CONTINUES TO SETTLE IN WITH A DRY LOW LEVEL AIRMASS. SUBSIDENT NORTHWEST FLOW WILL STEADILY BACK TO ZONAL WESTERLIES AS THE NEXT UPPER LOW MAKES LANDFALL ON THE CALIFORNIA COAST. A LLJ WILL SET UP MONDAY EVENING ACROSS THE HIGH PLAINS OF WEST TEXAS.
UNSEASONABLY COOL TEMPERATURES CAN THEN BE EXPECTED THE REMAINDER OF THE WEEK AS AN AREA OF LOW PRESSURE PERSISTS OVER THE NORTHEAST. AS THE TROF AXIS MOVES OVERHEAD THROUGH EARLY AFTERNOON. COLD FRONT PUSHES THROUGH LATER THIS EVENING. BRIEF RIDGING IN THE LOW- LEVELS AND EROSION OF MOISTURE DEPTH WILL EFFECTIVELY END RAIN CHANCES EARLY TUESDAY MORNING. SETTING UP A BROAD TROF OVER THE AREA THAT WILL INCLUDE SEVERAL WEAK DISTURBANCES CYCLING THROUGH. WITH THE BROAD TROF OVERHEAD.
TEMPERATURES EAST OF THE BOUNDARY ARE IN THE LOW 60S. WHILE TEMPS TO THE WEST ARE A FEW DEGREES COOLER IN THE MID 50S. THIS WILL HOPEFULLY ALLOW TEMPERATURES TO RISE INTO THE LOW TO MID 60S AFTER THE FRONTAL PASSAGE.
NEXT MAIN CONCERN BECOMES LARGE UPPER LEVEL LOW PRESSURE SYSTEM ACROSS NORTHERN MN WHICH WILL DROP SLOWLY SOUTHEAST THROUGH THE DAY.
HIGH PRESSURE WILL BE BUILDING INTO THE REGION TODAY BEHIND A DEPARTING COLD FRONT. COOL NIGHTS AND MILD DAYS INTO TUESDAY AS A CANADIAN COLD FRONT WHICH PUSHED THROUGH THE AREA LAST NIGHT USHERS IN A WELCOME CHANGE FROM THE LAST COUPLE OF WEEKS OF WET AND AT TIMES STORMY CONDITIONS. AS THE HIGH TRUNDLES OFF TO THE EAST TUESDAY NIGHT, GULF MOISTURE RETURNS AS DOES THE SHOWERS AND THUNDERSTORMS OVER THE LATTER HALF OF THE WEEK. COOLER THAN NORMAL TODAY AND TNITE WITH SOME COLD ADVECTION HOLDING TEMPS IN THE 70S UNDER SUNNY SKIES.
636 AM CDT MON APR 20 2015 FOR MORNING UPDATE HAVE ADJUSTED THE WESTERN EDGE OF THE LOW CLOUD COVER OVER CENTRAL NORTH DAKOTA AND HAVE PULLED IT TO THE WEST A BIT IN LINE WITH LATEST SATELLITE IMAGERY. UPPER LEVEL LOW SLIDING SLOWLY SOUTHEAST INTO THE WESTERN GREAT LAKES REGION. UPPER LOW SLIDES OVER THE NORTHERN GREAT LAKES ON TUESDAY AS RIDGE MOVES OVER THE ROCKIES.
A WEAK UPPER LEVEL LOW PRESSURE SYSTEM IN THE EAST PACIFIC WILL SWING INTO SOUTHERN CALIFORNIA TONIGHT AND TUESDAY. INSTABILITY ASSOCIATED WITH THE UPPER LOW WILL ALLOW FOR ISOLATED SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS.
751 AM EDT MON APR 20 2015 A COLD FRONT WILL MOVE THROUGH THE REGION TODAY AND BRING SHOWERS AND SOME STRONG THUNDERSTORMS TO THE REGION. WE WILL THEN SETTLE INTO A COOLER.
901 AM CDT MON APR 20 2015 SNOW SHOWERS ARE OCCURRING FROM THE IRON RANGE TO THE TWIN PORTS AS PIECES OF SHORT WAVE ENERGY ROTATE THROUGH THE AREA FROM THE BASE OF THE UPPER TROF. FROM NEAR FREEZING ACROSS THE TIP OF THE MINNESOTA ARROWHEAD TO NEAR 40 IN THE BRAINERD LAKES TO MOOSE LAKE REGION. THE DEEP UPPER LEVEL LOW WILL BE OVER THE LAKE SUPERIOR AREA TUESDAY NIGHT.
A COLD FRONT WILL BE MOVING ACROSS THE AREA LATER TODAY.
UPPER TROUGH SLOWLY MOVES EAST WITH A 500 MB LOW MOVING OVER THE U. DID NOT MAKE TOO MANY CHANGES TO THE GOING TEMPERATURE FORECAST AND WENT WITH CATEGORICAL POPS FOR TODAY FOR THE CWA AND THEN LIKELY POPS IN NORTHWEST LAKE EFFECT BELTS TONIGHT AND KEPT SOME SLIGHT CHANCE POPS IN THE FAR SOUTH DUE TO THE UPPER LOW MOVING INTO THE AREA AND WRAPAROUND PCPN IN THE AREA. WITH A TROUGH/SECONDARY COLD FRONT EXTENDING OVER CENTRAL LAKE SUPERIOR AND CENTRAL UPPER MI. 850MB TEMPS AHEAD OF THE TROUGH WILL AVERAGE AROUND -4C. AND FALL TO AROUND -7C BY THE END OF THE DAY BEHIND THE TROUGH. THE SIZABLE TROUGH WILL ENCOMPASS E MT THROUGH THE GULF STATES.
752 AM EDT MON APR 20 2015 AVIATION/MARINE A CHILLY WEEK IS DEVELOPING AS LOW PRESSURE HAS MOVED OVER THE GREAT LAKES. COOLER AIR WILL FLOW INTO WEST MICHIGAN BEHIND THE LOW. FORECAST CONCERNS CONTINUE TO DEAL WITH THE EVOLUTION OF THE LOW MOVING ACROSS LOWER MICHIGAN. OVERALL COVERAGE THOUGH IS BEGINNING TO DECREASE SOUTH OF THE MI/IN BORDER AS THE LOW MOVES NORTH. TUESDAY THE CORE OF THE UPPER LOW MOVES OVERHEAD.
A FEW LIGHT SHOWERS ARE POSSIBLE ACROSS THE HIGH PEAKS OF THE WHITE MOUNTAINS THIS AFTERNOON.
HAIL UP TO QUARTER SIZE WILL ALSO BE A CONCERN AS MORNING SOUNDINGS SHOW COOLER TEMPS ALOFT WITH -10 TO -12C AT 500MB.
611 AM CDT MON APR 20 2015 HIGH PRESSURE WILL CONTINUE TO CIRCULATE THROUGH THE HIGH PLAINS IN CONJUNCTION WITH DEEPENING LOW PRESSURE ACROSS THE LOWER GREAT LAKES.
THE HIGHEST PROBABILITIES OF SEVERE STORMS WILL BE FROM THE SUWANNEE RIVER VALLEY EASTWARD TOWARD THE ATLANTIC COAST WHERE SURFACE BASED INSTABILITY NOSING INLAND FROM THE GULF WILL BE HIGHEST AS THICKER CLOUDINESS OVER SE GA KEEPS THAT AREA SOMEWHAT MORE STABLE.
1030 AM EDT MON APR 20 2015 A COLD FRONT WILL MOVE EAST THROUGH THE GREAT LAKES AND OHIO VALLEY TODAY. BREEZY TO WINDY CONDITIONS ARE EXPECTED ON TUESDAY AHEAD OF A WEAK COLD FRONT.
COLD FRONT WILL SLOWLY SLIDE EAST AND SOUTH THROUGH THE DAY. ALSO ADDED IN A SLIGHT CHANCE ACROSS THE NORTH AS THE UPPER LEVEL LOW SWINGS THROUGH.
UPPER RIDGE ALONG THE COAST WILL SHIFT INLAND TODAY AND OVER OUR CWA TUESDAY WITH WARMER AIR BUT STILL DRY. NEW 12Z NAM SHOWS MOISTURE WITH A TROUGH JUST WEST OF THE RIDGE THAT WILL BRING A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS TO WRN HARNEY COUNTY LATE TUESDAY AND A BETTER CHANCE TO HARNEY COUNTY AND THEN BAKER COUNTY TUESDAY NIGHT.
1154 AM CDT MON APR 20 2015 SNOW SHOWERS ARE OCCURRING FROM THE IRON RANGE TO THE TWIN PORTS AS PIECES OF SHORT WAVE ENERGY ROTATE THROUGH THE AREA FROM THE BASE OF THE UPPER TROF. FROM NEAR FREEZING ACROSS THE TIP OF THE MINNESOTA ARROWHEAD TO NEAR 40 IN THE BRAINERD LAKES TO MOOSE LAKE REGION. THE DEEP UPPER LEVEL LOW WILL BE OVER THE LAKE SUPERIOR AREA TUESDAY NIGHT.
935 AM PDT MON APR 20 2015 A FEW WEAK UPPER LOWS WILL TRACK TO THE WEST AND SOUTH OF THE REGION THIS WEEK.
/ISSUED 741 AM EDT TUE SEP 8 2015/ BROAD UPPER LOW WILL PERSIST VICINITY OF THE LOWER MS VALLEY THROUGH THE PERIOD.
UPPER LEVEL RIDGE/TROUGH WAS LOCATED OVER BC COAST/ONTARIO RESPECTIVELY. UPPER LEVEL LOW OVER MAN WILL SHIFT INTO EASTERN CANADA BY THE END OF THE PERIOD. A SHORT WAVE TROUGH EXTENDED FROM SOUTH CENTRAL SASK TO SOUTHERN MT.
948 AM EDT TUE SEP 8 2015 A SLOW MOVING COLD FRONT ACROSS THE CENTRAL GREAT LAKES WILL STALL NORTH OF LAKE ERIE TODAY. LOW PRESSURE WILL MOVE NORTHEAST ALONG THE BOUNDARY WEDNESDAY AND PULL THE FRONT SOUTH ACROSS THE AREA.
The low will continue to move northward this afternoon with the center moving over land this afternoon. The higher rain chances will remain through the afternoon, but shift slightly northward. This area should be able to handle these rainfall amounts given the high FFG values and the fact the rain continues to shift northward.
The low clouds will quickly dissipate around mid-morning, with a VFR-based cumulus field developing by afternoon. Showers and thunderstorms will be possible tonight, mainly after Midnight, across our northern and northeastern counties with the approach of a cold front. The upper level high which has been centered over our area will be suppressed into northern Mexico and the Desert Southwest. This will occur as an upper trough moves from the northern Plains to the upper Midwest. Trailing portion of associated cold front will push south into the Texas Panhandle and northern Oklahoma this afternoon, with convection developing along it. Carrying the highest (40-50 percent) PoPs across the northern and eastern Big Country, where more coverage is expected.
1002 AM EDT TUE SEP 8 2015 HIGH PRESSURE TO THE SOUTHEAST OF THE OHIO VALLEY WILL MAINTAIN CONTROL OF THE WEATHER THROUGH TONIGHT WITH WARM AND HUMID CONDITIONS. A COLD FRONT WILL BRING SHOWERS AND THUNDERSTORMS INTO THE AREA ON WEDNESDAY AND WEDNESDAY NIGHT BEFORE HIGH PRESSURE AND SLIGHTLY LOWER TEMPERATURES MOVE IN FOR THE REST OF THE WEEK. EVEN COOLER CONDITIONS ARE FORECAST FOR THE WEEKEND. A SURFACE COLD FRONT IS FORECAST TO MOVE THROUGH THE REGION FROM WEDNESDAY INTO WEDNESDAY NIGHT. THE COLD FRONT HAS BEEN MODELED SLIGHTLY FASTER THAN IN PREVIOUS FORECAST CYCLES.
DECIDED TO BRIDGE POPS ACROSS THE NULL AREA OVER THE CENTRAL SECTIONS OF THE CWA FOR THIS AFTERNOON. ON WEDNESDAY, AN UPPER TROUGH WILL BEGIN MAKING ITS WAY EAST.
A STRENGTHENING WARM UPPER LEVEL RIDGE OVER THE SOUTHWEST U.
A COLD FRONT WILL MOVE SOUTH AND BRING A WIND SHIFT TO THE NORTH AT ALL LOCATIONS. NORTHWEST OF AN ALTUS TO EL RENO TO CHANDLER LINE WITH THE HIGHEST CHANCES ALONG THE KANSAS OKLAHOMA STATE LINE. AN OLD OUTFLOW BOUNDARY/EFFECTIVE COLD FRONT MAY SERVE AS A FAVORABLE AREA FOR STORM FORMATION OVER NORTHERN OKLAHOMA IN THE 2 TO 5 PM TIME FRAME. STILL KEPT THE HIGHEST RAIN CHANCES IN NORTHERN OKLAHOMA. COOLER CONDITIONS WILL OCCUR.
HIGH PRESSURE IS BUILDING ALOFT AND THE AIR MASS WILL BE TRENDING WARMER AND DRIER OVER THE FEW DAYS.
AN AREA OF LOW PRESSURE SOUTH OF TALLAHASSEE WILL MOVE NORTHWARD TODAY. AN AREA OF LOW PRESSURE SOUTH OF TALLAHASSEE WILL MOVE INLAND.
SHOULD SEE THE LOW CLOUD THIN OUT AND BACK AWAY FROM THE AREA THIS AFTERNOON WITH THE PRESSURE RISE COUPLET MOVING AWAY FROM THE AREA. BELIEVE THERE/S STILL THE SLIGHTLY CHANCE FOR A WEAK T-STORM OR TWO OVER THE HIGH TERRAIN SURROUNDING SOUTH PARK. WEAK COLD FRONT WILL PUSH ACROSS THE AREA THIS MORNING. WE WILL HAVE COOLER LOWS TONIGHT WITH MOUNTAIN COLD SPOTS BELOW FREEZING AND SOME 40S IN THE COOLER AREAS ON THE PLAINS. HIGH PRESSURE ALOFT WILL BUILD OVER MUCH OF THE WESTERN U.
940 AM EDT TUE SEP 8 2015 HIGH PRESSURE OVERHEAD WILL MOVE OFFSHORE FOR TODAY AND WEDNESDAY.
MOST OF THIS UNCERTAINTY IS DUE TO MODEL UNCERTAINTY WITH HOW FAR NORTH THE LOW OVER THE FLORIDA PANHANDLE MOVES. THE CLOSER THE LOW TO NORTHERN OR CENTRAL AL. A STRONG RIDGE REMAINS IN PLACE OVER TN AND MID-ATLANTIC STATES. THIS RIDGE IS FORECAST BY SOME MODELS TO SLIDE FURTHER SOUTH INCREASING SUBSIDENCE SLIGHTLY THIS AFTERNOON. ESPECIALLY WITH THE LOW BEING TRAPPED BETWEEN ONE RIDGE TO ITS WEST AND THE ONE OVER THE MID-ATLANTIC STATES. SOME WEAK LOW LEVEL CONVERGENCE COULD STILL BE IN PLACE DESPITE THE UPPER LEVEL RIDGING OVER THE AREA. ASSOCIATED WITH THE WEAK INVERTED TROUGH AXIS.
A DECENT 500MB WAVE IS MOVING ACROSS CENTRAL MANITOBA WHICH WILL DRAG AN UPPER LEVEL TROUGH THROUGH THE AREA TODAY AS WELL. UPPER LEVEL RIDGE/TROUGH WAS LOCATED OVER BC COAST/ONTARIO RESPECTIVELY. UPPER LEVEL LOW OVER MAN WILL SHIFT INTO EASTERN CANADA BY THE END OF THE PERIOD. A SHORT WAVE TROUGH EXTENDED FROM SOUTH CENTRAL SASK TO SOUTHERN MT.
A WEAK WARM FRONT MOVING THROUGH WESTERN WASHINGTON WILL CONTINUE TO BRING CLOUDS AND A FEW SHOWERS TO THE REGION THROUGH THIS AFTERNOON. HIGH PRESSURE WILL BUILD ACROSS THE AREA STARING WEDNESDAY. WITH ASSOCIATED UPPER LEVEL LOW MAKING ITS WAY INLAND WELL NORTH OF THE AREA IN BRITISH COLUMBIA. ALTHOUGH SOME SHOWERS MIGHT DIP INTO THE HIGHER TERRAIN OR NORTHERN PORTIONS OF SNOHOMISH. UPPER LEVEL RIDGING WILL BUILD OVER THE WESTERN US. THE RIDGE OF HIGH PRESSURE WILL CONTINUE TO STRENGTHEN AND BUILD NORTH INTO THE LATTER PORTION OF THIS WEEK.
HIGH PRESSURE ALOFT WILL STRENGTHEN ACROSS THE WESTERN STATES THROUGH THE BALANCE OF THE WEEK. THEN UPPER LEVEL TROUGH EXITING THE NORTHERN ROCKIES AND NORTHERN GREAT BASIN WILL OPEN UP THE WESTERN STATES TO BUILDING HIGH PRESSURE ALOFT THROUGH THE BALANCE OF THE WEEK. HE MOISTURE PLUME THAT HAS BEEN ACROSS THE SOUTHERN AND EASTERN PORTIONS OF UTAH THE PAST SEVERAL DAYS WILL BEGIN TO SHIFT SOUTH AS A STILL DRIER AND STABLE WEST-NORTHWEST FLOW DEVELOPS BEHIND THE EXITING TROUGH. THEN FLATTEN OUT AS UNDER STABLE HIGH PRESSURE ENCOMPASSING THE REGION.
1046 AM EDT TUE SEP 8 2015 A WEAK COLD FRONT OVER THE SAINT LAWRENCE VALLEY WILL SLOWLY SAG SOUTH TODAY.
Isentropic ascent is aiding in this rain with models showing the bulk of the light rain occurring before noon today as a warm front lifts north of the Canadian border allowing slightly drier air to move in from the southwest.
FOR 12Z FORECASTS UPPER LOW SPINNING OVER SOUTHEASTERN U.
WINDS IN THE LOWEST 5000 FEET ARE LIGHT AND VARIABLE. THE WINDS ARE FROM THE EAST AND THEN NORTHEAST AS THEY ROTATE AROUND AN UPPER LEVEL AREA OF LOW PRESSURE. BUT THIS WILL ALSO CHANGE BY WED AS THE STRONGEST CAP SHOULD MOVE NORTH OF THE AREA TO ORIENT BETWEEN A COLD FRONT MOVING AND STALLING NEAR THE ARKLATEX AREA AND A SURGING CBRZ. A STRONGER PUNCH OF COOL DRY AIR WILL REINFORCE THE COLD FRONT AND CAUSE IT TO MOVE INTO THE AREA AND THROUGH BY SAT NIGHT. 35 NOT MUCH CHANGE IN THE MARINE FORECAST AS A WEAK UPPER LOW OVER THE EASTERN GULF SHOULD SLOWLY MOVE WEST OVER THE NEXT DAY OR SO.
800 AM EDT TUE SEP 8 2015 RAIN WILL BE LIKELY AS A COLD FRONT APPROACHES ON WEDNESDAY. A COUPLE DEGREES OF ADDITIONAL WARMING SHOULD ALLOW TEMPERATURES TO SURGE INTO THE LOWER TO LOCALLY MIDDLE 90S BY AFTERNOON WITH ABUNDANT SUNSHINE. AND BECOME LIKELY BY AFTERNOON AS A PREFRONTAL TROUGH IS PROJECTED OVER THE UPPER OHIO REGION.
741 AM EDT TUE SEP 8 2015 BROAD UPPER LOW WILL PERSIST VICINITY OF THE LOWER MS VALLEY THROUGH THE PERIOD.
A 500MB RIDGE ACROSS NORTHERN MEXICO INTO WEST TEXAS WILL CONTINUE TO PROVIDE SUBSIDENCE ACROSS THE RIO GRANDE VALLEY. LATEST WATER VAPOR SATELLITE IMAGERY SHOWS A 500MB RIDGE CENTERED OVER WEST TEXAS INTO NORTHERN MEXICO AND A 500MB LOW OVER THE NORTHERN GULF OF MEXICO. RAIN CHANCES WILL SLOWLY INCREASE ACROSS THE GULF WATERS TONIGHT AND ACROSS THE RIO GRANDE VALLEY ON WEDNESDAY AS THE MID LEVEL LOW/TROUGH MOVES INTO THE WESTERN GULF OF MEXICO. LATEST BRO RADAR INDICATES A FEW STEAMER SHOWERS ACROSS THE LOWER TEXAS GULF WATERS EARLY THIS MORNING. HIGH TEMPERATURES TODAY AND WEDNESDAY WILL RANGE FROM THE LOWER 90S NEAR THE COAST TO AROUND 100 ACROSS THE UPPER VALLEY.
TEMPERATURES ALOFT ARE A DEGREE OR TWO WARMER ALOFT TODAY AROUND -6.
THE KEYS ARE ENGULFED IN AN AREA OF HIGH PRESSURE WITH LIGHT SOUTHERLY FLOW. THE UPPER LOW OVER THE NORTH CENTRAL GULF WILL SLOWLY BROADEN AND BE REPLACED BY HIGH PRESSURE THROUGH WEDNESDAY. MEANWHILE THE LOW LEVELS WILL SEE THE HIGH PRESSURE SOUTH AND EAST OF THE KEYS MOVE OVER THE AREA.
920 AM PDT TUE SEP 8 2015 WELL ABOVE NORMAL TEMPERATURES ARE EXPECTED THIS WEEK DUE TO A BUILDING RIDGE OF HIGH PRESSURE.
742 AM EDT TUE SEP 8 2015 HIGH PRESSURE OVERHEAD WILL MOVE OFFSHORE FOR TODAY AND WEDNESDAY.
THE FORECAST STAYS VFR TODAY AND TONIGHT AS AN AREA OF LOW PRESSURE EVIDENT IN THIS MORNING'S SATELLITE IMAGERY OVER THE NORTHERN FLORIDA PANHANDLE DRIFTS SLOWLY NORTH.
913 AM EDT TUE SEP 8 2015 MORNING WATER VAPOR SATELLITE IMAGERY IS SHOWING AN UPPER/MID LEVEL AREA OF LOW PRESSURE SOUTH OF THE MISSISSIPPI RIVER DELTA. WITH THE LOWER LEVEL CIRCULATION VISIBLE ON THE IR CHANNEL DISPLACED FARTHER EAST OVER THE EXTREME NORTHEASTERN CORNER OF THE GULF OF MEXICO. BUT THE HIGHEST STORM COVERAGE WILL STAY INLAND OF MOST AREA TERMINALS.
A WEAK COLD FRONT PUSHING THROUGH THE TEXAS AND OKLAHOMA PANHANDLES TODAY WILL KEEP WINDS MOSTLY OUT OF THE NORTH TO NORTHEAST AT KDHT AND KGUY THROUGH THE PERIOD.
720 AM EDT TUE SEP 8 2015 UPPER AIR PATTERN CONSISTS OF A 500 MB TROUGH OVER THE NORTHERN AND CENTRAL PLAINS WITH A RIDGE ACROSS THE SOUTHERN U. KEPT IN SOME POPS WITH THE HIGHEST POPS ACROSS THE SOUTH AND LOWEST IN THE NORTH AND THIS SHOULD MOVE OUT BY TONIGHT WITH DRY WEATHER MOVING IN LATE. BROAD TROUGHING WILL BE IN PLACE ACROSS THE AREA.
The southeastern edge of the low level jet appears to have generated enough lift to result in scattered thunderstorms over this region. An upper level trough of low pressure will move east across the northern and central Plains from today into tonight. This trough will drive a cold front southeast into central Missouri and southeastern Kansas this afternoon. Many of the high resolution convective allowing models (CAMs) indicate this. Temperatures will be cooler behind that front and given the precipitation and clouds.
MOST OF THIS RAIN IS FROM THE LOW PRESSURE THAT IS SLIDING NORTHWARD FROM THE GULF OF MEXICO.
AFTERNOON HIGHS WILL BE IN THE LOW TO MIDDLE 90S THIS AFTERNOON WITH MIDDLE TO UPPER 80S TOMORROW. WATER VAPOR SATELLITE TRENDS THIS MORNING PLACE AN UPPER LEVEL LOW OVER THE LOUISIANA GULF COAST AND A LONGWAVE TROUGH AXIS EXTENDING FROM THE UPPER MIDWEST/GREAT LAKES REGION BACK THROUGH THE CENTRAL PLAINS/SOUTHWEST UNITED STATES.
752 AM EDT TUE SEP 8 2015 A RIDGE OF HIGH PRESSURE WILL REMAIN OVER THE REGION THROUGH EARLY WEDNESDAY.
Expect an increase in coverage later this afternoon as cold front/outflow boundaries eventually work farther south into northeast Oklahoma.
A cold front will approach northeast Oklahoma by late this afternoon with widespread showers and thunderstorms developing along the front and impacting TAF sites by around 00z at northern sites and after about 03z at KFSM/KMLC.
715 AM EDT TUE SEP 8 2015 A SLOW MOVING COLD FRONT ACROSS THE CENTRAL GREAT LAKES WILL STALL NORTH OF LAKE ERIE TODAY. LOW PRESSURE WILL MOVE NORTHEAST ALONG THE BOUNDARY WEDNESDAY AND PULL THE FRONT SOUTH ACROSS THE AREA.
1204 PM EDT TUE SEP 8 2015 A SLOW MOVING COLD FRONT ACROSS THE CENTRAL GREAT LAKES WILL STALL NORTH OF LAKE ERIE TODAY. LOW PRESSURE WILL MOVE NORTHEAST ALONG THE BOUNDARY WEDNESDAY AND PULL THE FRONT SOUTH ACROSS THE AREA.
AN AREA OF LOW PRESSURE WILL LIFT NORTH TOWARD THE SOUTHERN APPALACHIAN REGION. CHATTANOOGA AIRPORT, TN 89 71 84 70 / 30 20 70 60 KNOXVILLE MCGHEE TYSON AIRPORT, TN 87 70 84 69 / 20 20 70 60 OAK RIDGE, TN 88 70 83 70 / 20 20 70 60 TRI CITIES AIRPORT, TN 87 66 83 67 / 20 20 70 60.
1045 AM EDT TUE SEP 8 2015 A RIDGE OF HIGH PRESSURE WILL REMAIN OVER THE REGION THROUGH EARLY WEDNESDAY.
WEAK HIGH PRESSURE CONTINUES TO BUILD ALOFT OVER THE REGION. A WARM FRONT PASSING ACROSS WASHINGTON MAY SPREAD SPOTTY LIGHT RAIN OVER SW WASHINGTON TODAY.
648 AM CDT TUE SEP 8 2015 A COLD FRONT DRAPED ACROSS THE NORTHERN PORTION OF OUR CWA WAS PROVIDING A FOCUS FOR THUNDERSTORM ACTIVITY THIS MORNING. AN UPPER LEVEL TROUGH WILL MAKE ITS WAY THROUGH THE REGION TODAY. PRECIP CHANCES WILL DIMINISH BEHIND THE TROUGH AXIS TONIGHT AS THE COLD FRONT FINALLY PUSHES OUT OF THE REGION.
VERY WARM AND DRY CONDITIONS WILL PERSIST THROUGH MUCH OF THE WEEK AS HIGH PRESSURE REMAINS OVER MUCH OF THE WEST COAST.
BY LATER THIS AFTERNOON AND EVENING BETTER CHANCES FOR SH AND TS WILL ENTER NW AR AHEAD OF A COLD FRONT.
BELIEVE THERE/S STILL THE SLIGHTLY CHANCE FOR A WEAK T-STORM OR TWO OVER THE HIGH TERRAIN SURROUNDING SOUTH PARK. WEAK COLD FRONT WILL PUSH ACROSS THE AREA THIS MORNING. WE WILL HAVE COOLER LOWS TONIGHT WITH MOUNTAIN COLD SPOTS BELOW FREEZING AND SOME 40S IN THE COOLER AREAS ON THE PLAINS. HIGH PRESSURE ALOFT WILL BUILD OVER MUCH OF THE WESTERN U.
339 AM EDT THU JUL 23 2015 THE SYNOPTIC PATTERN OF A RIDGE OVER THE SOUTHERN PLAINS AND A TROUGH OVER THE EAST COAST WILL PREVAIL THROUGH THE WEEKEND. THE TROUGH WILL SHARPEN AND GLOBAL MODELS ARE IN CONSENSUS IN CLOSING OFF A MID LEVEL TROUGH OVER FLORIDA.