Aikyam-Lab/Synoptic-Bench huggingface dataset:
756 PM EST FRI FEB 5 2016 HIGH PRESSURE WILL BUILD IN FOR THE WEEKEND. STRATUS DECREASING ACROSS NORTH CENTRAL AND EAST CENTRAL PA THIS EVENING AS HIGH PRESSURE BUILDS AND INVERSION HEIGHTS LOWER. AN UPPER LEVEL LOW THAT WILL BE MOVING THROUGH THE SOUTHERN STATES WILL SLOWLY MAKE ITS WAY UP THE EASTERN SEABOARD. HOWEVER CURRENT ENSEMBLES SHOW A PROLONGED PERIOD OF LIGHT- MODERATE PRECIP FAVORING THE HIGHER WESTERN AND NORTHERN AREAS. THE SEEMINGLY MOST CERTAIN PART OF THE FORECAST IS THAT THE UPPER TROUGH IS EXPECTED TO BE SLOW MOVING OVER THE EASTERN US. HIGH PRESSURE OVER PENNSYLVANIA WILL BRING A NEAR CERTAINTY OF WIDESPREAD VFR CONDS AND RELATIVELY LIGHT WIND BOTH TONIGHT AND SATURDAY.
LOWERED TEMPERATURES A BIT IN THE VALLEYS AND ON RIDGES TO MATCH THE COLDER GUIDANCE A BIT BETTER.
COOL HIGH PRES RIDGE LOCATED FROM MS VALLEY NEWD INTO THE MID ATLC WITH N TO NE FLOW LEVEL FLOW OVER THE FORECAST REGION. AS THE CENTRAL CONUS TROUGH TRANSLATES EWD. MAINLY FOR THE NRN WATERS AS COASTAL TROUGH AND EVENTUAL LOW PRES DEVELOPS OFFSHORE.
DEEP MOISTURE ASSOCIATED WITH AN APPROACHING COLD FRONT IS FORECAST TO REMAIN WEST OF THE FORECAST AREA THROUGH TODAY. MODELS HAVE COME INTO BETTER AGREEMENT ON TIMING OF THE COLD FRONT.
752 AM EDT MON APR 11 2016 A SLOW MOVING COLD FRONT. HIGH PRESSURE WILL BUILD OVER THE REGION FOR TUESDAY THROUGH THE REST OF THE WEEK. AFTER AN INITIAL PERIOD OF LIGHT RAIN ACROSS THE LOWER SUSQ VALLEY. MUCH OF THE REGION SE OF THE I-81 CORRIDOR COULD STAY MAINLY DRY AFTER 14Z /AS A SFC WARM FRONT LIFTS INTO SOUTHERN PA DURING THE AFTERNOON AHEAD OF A DEVELOPING SFC WAVE OVR THE OHIO VALLEY/. TO THE LOWER 60S IN THE SOUTHERN VALLEYS. SFC COLD FRONT MARCHES SOUTHEAST ACROSS THE STATE TONIGHT/TUESDAY MORNING WITH FREQUENT. IMPROVING CONDITIONS WILL DEVELOP LATE TUESDAY MORNING /EARLY TUESDAY AFTERNOON IN THE SE/ AS HIGH PRESSURE BUILDS IN ACCOMPANIED BY A DRIER NW LLVL FLOW OF SHALLOW COOL AIR.
ISSUED BY NATIONAL WEATHER SERVICE CHARLESTON WV 1143 AM EDT MON APR 11 2016 PERIODS OF RAIN ARE EXPECTED THROUGH TONIGHT WITH THE APPROACH AND PASSAGE OF A COLD FRONT. THE COLD FRONT IS PROGGED FOR AN OVRNGT PASSAGE. DRY CONDITIONS AND A GRADUAL WARMING TREND IN TEMPERATURES THROUGH THE PERIOD AS HIGH PRESSURE BUILDS OVER THE REGION. THE ECMWF CONTINUES TO SHOW MORE OF A CLOSED LOW MEANDERING ALONG THE MID ATLANTIC COAST FOR THE WEEKEND. AND PREVIOUS FORECAST OF SLIGHT CHANCE OF SHOWERS FOR THE SOUTHEAST RIDGES WAS MAINTAINED. STRONGER GUSTS WILL MIX IN MIDDAY AS A COLD FRONT APPROACHES.
HIGH PRESSURE RIDGE WILL BE OVER THE REGION TODAY FOR MOSTLY CLEAR SKIES THIS MORNING AND INCREASING CLOUDS THIS AFTERNOON AND OVERNIGHT. HIGH PRESSURE RIDGING WILL MOVE FROM THE IDAHO PANHANDLE INTO THE WESTERN THIRD OF MONTANA TODAY, BRINGING A MIX OF CLEAR SKIES AND SCATTERED MID- AND HIGH- ALTITUDE CLOUDS.
733 AM CDT MON APR 11 2016 THE CHANCE FOR FREEZING TEMPERATURES TONIGHT. AXIS OF UPPER TROUGH EXTENDED FROM WESTERN HUDSON BAY INTO EASTERN NEBRASKA EARLY THIS MORNING.
1136 AM EDT MON APR 11 2016 RAIN WILL EXIT LOCATIONS SOUTH OF US ROUTE 24 THIS AFTERNOON AS A COLD FRONT EXITS THE AREA. SKIES WILL CLEAR THIS EVENING AS A RIDGE OF HIGH PRESSURE BUILDS ACROSS THE SOUTHERN GREAT LAKES AND OHIO VALLEY.
1158 AM EDT MON APR 11 2016 HIGH PRESSURE WILL MOVE OFFSHORE THIS AFTERNOON. A COLD FRONT WILL MOVE THROUGH THE REGION TUESDAY NIGHT.
AN UPPER LEVEL RIDGE AXIS WILL SHIFT EAST INTO IDAHO TODAY AS A WEAK WAVE NEAR THE COAST MOVES INLAND.
1103 AM EDT MON APR 11 2016 STRONG FLOW ALOFT WEAKENS BEFORE COLD FRONT PASSES OVERNIGHT TONIGHT.
716 AM EDT MON APR 11 2016 RAINY WEATHER IS EXPECTED INTO TUESDAY, THANKS TO A SLOW MOVING COLD FRONT, AND LOW PRESSURE AREA ALONG IT. FOLLOWING THESE SYSTEMS, A LARGE HIGH PRESSURE AREA WILL BUILD IN TOWARDS MID WEEK, WITH DRY CONDITIONS, AND MODERATING TEMPERATURES. BY MID TO LATE AFTERNOON, HIGHS SHOULD RANGE FROM THE MID 40S IN OUR FAR NORTHERN/EASTERN AREAS (SOUTHERN TUG HILL, MOHAWK VALLEY, AND CATSKILL ZONES), TO THE LOW-MID 50S MOST OTHER LOCALES. PERIODIC RAIN THIS EVENING, WILL BECOME MORE CONCENTRATED FOR A TIME LATER TONIGHT AND EARLY TUESDAY, AS THE MAIN COLD FRONT, WITH A SURFACE WAVE CONNECTED TO IT, SLOWLY TRUDGES ACROSS NY AND PA. AS COLDER AIR SLOWLY BUILDS IN BEHIND THE FRONT, RAIN MAY END AS A BRIEF PERIOD OF WET SNOW OVER SOME OF THE HIGHER TERRAIN IN CENTRAL NY TUESDAY MORNING.
705 AM CDT MON APR 11 2016 08z/3am surface analysis shows cold front along a Danville to Taylorville line. Front will only make slow progress southward and with a wave of low pressure tracking along it, showers will persist for much of the day across the E/SE CWA. As another strong Canadian high pressure builds in from the northwest, skies will clear and temperatures will drop tonight. The high will be overhead on Tuesday, ensuring sunny but cool conditions with highs in the lower to middle 50s. Another potentially frosty night will be in store Tuesday night as the ridge axis remains overhead and lows dip back into the lower 30s. The persistent upper troughing over eastern Canada/Great Lakes will be replaced by a ridge axis as blocking develops across the CONUS by the end of the week.
CHATTANOOGA AIRPORT, TN 72 58 65 43 / 50 90 60 10 KNOXVILLE MCGHEE TYSON AIRPORT, TN 72 55 61 40 / 40 90 70 10 OAK RIDGE, TN 73 54 61 40 / 40 90 60 10 TRI CITIES AIRPORT, TN 74 53 59 37 / 20 90 70 10.
CLOUDS WILL SCOUR OUT IN THE WAKE OF THE COLD FRONT AS IT TRACKS ACROSS THE AREA FROM NW TO SE 18- 21Z. THIS SAME MOISTURE AXIS WILL REMAIN IN PLACE THROUGH THE NIGHT AND WILL CONTRIBUTE TO DIURNALLY DRIVEN TUESDAY MORNING CLOUDS PRIOR TO THE ARRIVAL OF HIGH PRESSURE. AHEAD OF THE UPPER LEVEL TROUGH AXIS WHICH ARRIVES TONIGHT. AS LARGE ANTICYCLONE ARRIVES OVER LOWER MICHIGAN.
610 AM CDT MON APR 11 2016 Cold front moving across the area will continue moving southeast today. There are some fairly stout south- southwest winds holding up the front blowing out of the lower Mississippi Valley right now, but eventually the sheer weight of the cold air will shove the front through southern portions of the CWFA by late morning according to most guidance. A strong Canadian high will build across the Midwest tonight bringing freezing temperatures to much of the northern 1/3 of the CWFA by morning. High amplitude blocky pattern will develop by late week with a trof off the east coast, a ridge over the Ohio Valley and Midwest, and another trof over the Rockies.
A cold front will move south across the area this evening, with winds becoming north and gusty at times. For tonight, a cold front will move south across West Central Texas during the evening and exit the area by 08Z.
ESPECIALLY IN THE HIGHER TERRAIN. ADJUSTED THE POP/WX GRIDS TO REFLECT CURRENT RADAR TRENDS AND TIMING OF PRECIP WITH THE COLD FRONT. TRENDS IN RADAR DATA/SHORT TERM MODEL GUIDANCE SUGGEST THAT EXPANDING AREA OF SHRA/EMBEDDED TSRA CURRENTLY OVER THE LOWER MISS VALLEY WILL ARRIVE INVOF MSL BTWN 11/14-16Z AND HSV BTWN 16-18Z. AN ADDITIONAL ROUND OF SHRA WILL OCCUR BTWN 12/04-10Z AS A COLD FRONT MOVES SWD ACROSS THE REGION.
1039 AM CDT MON APR 11 2016 MORNING UPDATE INCLUDED LITTLE CHANGE BUT DID INTRODUCE A FREEZING WARNING FOR THE OVERNIGHT AND EARLY MORNING HOURS TUESDAY. THIS IS OCCURRING AS A TROUGH IS MOVING ACROSS THE UPPER MIDWEST AND INTO THE GREAT LAKES REGION TODAY.
MORNING WATER VAPOR AND H5 ANALYSIS DEPICT A RIDGE OVER NORTHERN NEVADA EXTENDING NORTH INTO EASTERN BRITCOL. AND A WEAK TROUGH OVER SOCAL SLOWLY CHURNING EAST BENEATH IT. THE UPSTREAM RIDGE WILL SHIFT EAST OVER THE NORTHERN ROCKIES STATES TUESDAY WITH THE INITIAL INFLUENCE OF AN IMPRESSIVE PACIFIC TROUGH NOSING INTO THE PACNW.
823 AM EDT MON APR 11 2016 PERIODS OF RAIN ARE EXPECTED THROUGH TONIGHT WITH THE APPROACH AND PASSAGE OF A COLD FRONT. THE COLD FRONT IS PROGGED FOR AN OVRNGT PASSAGE. DRY CONDITIONS AND A GRADUAL WARMING TREND IN TEMPERATURES THROUGH THE PERIOD AS HIGH PRESSURE BUILDS OVER THE REGION. THE ECMWF CONTINUES TO SHOW MORE OF A CLOSED LOW MEANDERING ALONG THE MID ATLANTIC COAST FOR THE WEEKEND. AND PREVIOUS FORECAST OF SLIGHT CHANCE OF SHOWERS FOR THE SOUTHEAST RIDGES WAS MAINTAINED. STRONGER GUSTS WILL MIX IN MIDDAY AS A COLD FRONT APPROACHES.
1027 AM EDT MON APR 11 2016 A SLOW MOVING COLD FRONT WILL SLIDE SOUTHEAST AND CROSS PENNSYLVANIA TONIGHT AND EARLY TUESDAY. HIGH PRESSURE WILL BUILD OVER THE REGION FOR TUESDAY THROUGH THE REST OF THE WEEK. THE BEST CHANCE FOR RELATIVELY NICER WEATHER TODAY WILL BE ACROSS THE LOWER SUSQ VALLEY/MUCH OF THE REGION SE OF THE I-81 CORRIDOR WHICH COULD REMAIN MOSTLY DRY AS A SFC WARM FRONT LIFTS INTO SOUTHERN PA DURING THE AFTERNOON AHEAD OF A DEVELOPING SFC WAVE OVR THE OHIO VALLEY. TO THE LOWER 60S IN THE SOUTHERN VALLEYS. SFC COLD FRONT MARCHES SOUTHEAST ACROSS THE STATE TONIGHT/TUESDAY MORNING WITH FREQUENT. IMPROVING CONDITIONS WILL DEVELOP LATE TUESDAY MORNING /EARLY TUESDAY AFTERNOON IN THE SE/ AS HIGH PRESSURE BUILDS IN ACCOMPANIED BY A DRIER NW LLVL FLOW OF SHALLOW COOL AIR.
A cold front will move south this evening through southeast New Mexico and the northern Permian Basin and is forecast to be near the Pecos River by 1 am cdt Tuesday. A cold front will move south through KCNM and KHOB around 12/00Z, then through the rest of the sites by 12/06Z, with gusty north to northeast winds behind it. /issued 316 AM CDT MON APR 11 2016/ An upper trough moving across the TX Panhandle this morning continues to weaken. A strong cold front will arrive late today with gusty northerly winds developing behind it. another UA trough will move east along the U. A few showers and thunderstorms will be possible Tuesday night as the trough moves across the area.
RIDGE ALOFT FROM THE ERN GULF OVER FL WITH LOW LVL EASTERLY FLOW FROM THE ATLC WILL CONTINUE INTO THE AFTERNOON. BREEZY FOR THE BREVARD AND THE TREASURE COAST THIS AFTERNOON WITH ONSHORE FLOW AND SLIGHTLY TIGHTER GRADIENT ACROSS SRN SECTIONS WITH HIGH PRESSURE MOVING OFFSHORE FROM THE MID ATLANTIC.
520 AM PDT MON APR 11 2016 ANOTHER WEAK LOW PRESSURE SYSTEM PASSING TO THE SOUTH WILL BRING A CHANCE OF RAIN AND A SLIGHT CHANCE OF THUNDERSTORMS TO THE INTERIOR.
1127 AM EDT MON APR 11 2016 A WARM FRONT LIFTS NORTH TODAY FOLLOWED BY A COLD FRONT LATE TONIGHT. HIGH PRESSURE BUILDS IN FOR THE SECOND HALF OF THE WEEK. COLD FRONT APPROACHES FROM THE WEST. WILL STILL HAVE TO MONITOR POSSIBLE FEATURE OVER THE WESTERN ATLANTIC THAT MAY DEVELOP ON THE EASTERN PERIPHERY OF THE LARGE UPPER LEVEL RIDGE/OMEGA BLOCK OVER THE MIDWEST.
803 AM EDT MON APR 11 2016 HIGH PRESSURE AND AN ENHANCED PRESSURE GRADIENT WILL CONTINUE ACROSS THE REGION TODAY WITH EASTERLY WINDS ACROSS THE ATLANTIC WATERS IN THE 15 TO NEAR 20 KNOT RANGE. THE PREVAILING BENIGN WEATHER PATTERN CONTINUES TODAY AND INTO TUESDAY AS A LARGE AREA OF HIGH PRESSURE OVER THE EASTERN SEABOARD GRADUALLY MIGRATES E. THE DRY AND PLEASANT WEATHER CONDITIONS WILL CONTINUE THROUGH TUE WITH AFTERNOON HIGHS IN THE LOW TO MID 80S OVER INTERIOR AND GULF COAST AREAS.
Isolated tstms remain possible this afternoon ahead of a cold front moving southeastward through the region. This feature will be accompanied by at least one wave of low pressure along it.
IN THE LOW LEVELS OF THE ATMOSPHERE. AN ATLANTIC RIDGE OF HIGH PRESSURE OVER THE SOUTHEASTERN UNITED STATES WILL SHIFT SOUTHWARD THIS AFTERNOON. AN ANTICYCLONE WILL BE LOCATED NEAR THE YUCATAN PENINSULA TODAY.
1015 AM EDT MON APR 11 2016 A WARM FRONT LIFTS NORTH TODAY FOLLOWED BY A COLD FRONT LATE TONIGHT. HIGH PRESSURE BUILDS IN FOR THE SECOND HALF OF THE WEEK. COLD FRONT APPROACHES FROM THE WEST. WILL STILL HAVE TO MONITOR POSSIBLE FEATURE OVER THE WESTERN ATLANTIC THAT MAY DEVELOP ON THE EASTERN PERIPHERY OF THE LARGE UPPER LEVEL RIDGE/OMEGA BLOCK OVER THE MIDWEST.
Cold front will push through E OK, NW AR today, with main aviation impacts to occur with thunderstorm activity. Precip chances will come to an end tonight as the synoptic cold front clears our area. with cooler temps initially then gradually warming. when a deep western CONUS trough slides slowly east toward the Plains.
AN UPPER TROUGH WILL BRING SHOWERY WEATHER TUESDAY.
A COLD FRONT WILL MOVE THROUGH TERMINALS LATE IN THE TAF CYCLE WITH WINDS SWITCHING AROUND TO THE WNW.
621 AM CDT MON APR 11 2016 Early this morning showers and thunderstorm persist along a cold front settling south into southern Missouri. However, looking at the upcoming workweek, this cool down in temperatures wont last long as a developing trough over the eastern Pacific helps nudge an upper level ridge east across the Plains States. conditions will warm up nicely as the upper level ridge slides across the center of the Nation.
943 AM EDT MON APR 11 2016 MORNING 12Z TBW RAOB CONTINUES TO SHOW A DRY ATMOSPHERE IN PLACE ACROSS THE PENINSULA THIS MORNING ALTHOUGH WE ARE BEGINNING TO SEE SIGNS OF A GRADUAL MOISTURE INCREASE IN THE LOW LEVELS COMPARED TO 24 HOURS AGO. TEMPERATURES WILL WARM IN THE LOW TO MID 80S WHICH SHOULD BE SUFFICIENT ENOUGH FOR A SEABREEZE TO FORM NEAR THE COASTAL REGIONS. HIGH PRESSURE WILL SHIFT EASTWARD ON TUESDAY.
/ISSUED 440 AM CDT MON APR 11 2016/ COLD FRONT CURRENTLY STRETCHED ACROSS THE NORTHERN TEXAS PANHANDLE IS EXPECTED TO PUSH SOUTHWARD OVER THE NEXT COUPLE OF HOURS AS THE UPPER LOW MOVES INTO OKLAHOMA. THE COMBINATION OF THE COOLER POST-FRONTAL AIRMASS AND CLOUDY SKIES SHOULD KEEP HIGH TEMPERATURES IN THE 50S TO NEAR 60. THERE IS THE POSSIBILITY FOR OUR OVERNIGHT LOW TEMPERATURES MONDAY NIGHT INTO TUESDAY MORNING TO DROP BELOW 36 DEGREES AND POSSIBLY EVEN TO THE FREEZING MARK (ESPECIALLY ACROSS THE WESTERN OKLAHOMA PANHANDLE). TUESDAY SHOULD BE MOSTLY DRY FOR THE BETTER PART OF THE PANHANDLES BEFORE THE NEXT UPPER LOW TRAVERSES THE AREA.
Cold front advancing through northeast Oklahoma and northwest Arkansas this morning.
SURFACE AND UPPER LEVEL HIGH PRESSURE WILL PROVIDE A PROLONGED STRETCH OF DRY WEATHER AND SIGNIFICANTLY WARMER CONDITIONS AS THE WEEK WEARS ON. COLD FRONT FROM NEAR KMIE TO THE INDY METRO TO JUST SOUTH OF KHUF AT 1330Z. UTILIZED RAP HOURLY TEMPS TO HELP FRAME THE HIGHS FOR THE REST OF THE DAY. NEAR OR JUST BELOW FREEZING TEMPERATURES MAY OCCUR AGAIN TONIGHT AND PERHAPS TUESDAY NIGHT AS WELL. UPPER FLOW LOOKS TO EVOLVE INTO AN OMEGA BLOCKING PATTERN. WITH INDIANA AND THE OHIO VALLEY UNDERNEATH THE BLOCKING HIGH. MEANWHILE AT THE SURFACE STRONG HIGH PRESSURE OVER QUEBEC IS EXPECTED TO CONTINUE TO PROVIDE A DRY EASTERLY FLOW OF AIR TO CENTRAL INDIANA. THE COLD FRONT IS SOUTHEAST OF THE TERMINALS AND WILL MOVE FURTHER SOUTHEAST TONIGHT.
GONE WITH COOLER VALUES THAT ARE MORE IN LINE WITH EC GUIDANCE.
WINDS WILL BE LIGHT AND WILL SHIFT FROM WESTERLY TO NORTHWESTERLY AS A WEAK COLD FRONT PASSES THIS AFTERNOON/EVENING. A WEAK COLD FRONT WILL MOVE THROUGH THE AREA THIS AFTERNOON/EVENING. CLOUDS WILL MOVE IN FROM THE NORTHWEST AND HIGHS WILL BE IN THE LOW TO MID 90S.
THE PRE-FRONTAL TROUGH WAS WEAKENING AND HAD MOVED THROUGH THE FORECAST AREA. THE TRAILING COLD FRONT WAS MOVING OUT OF EAST CENTRAL ARKANSAS AND INTO NORTHWEST MISSISSIPPI AS OF 04Z.
STORM WILL CONTINUE MOVING NORTHEAST OVER EASTERN CO AND NM AND THE PAN HANDLES AND A RIDGE WILL BUILD OVER THE AREA FROM SW TO NE BEHIND THE TROUGH.
304 AM EDT TUE MAY 12 2015 COLD FRONT IS WORKING SOUTH TOWARD THE OHIO RIVER PRESENTLY. THE COLD FRONT MEANWHILE. GIVING WAY TO A BEAUTIFUL AFTERNOON AS DEWPOINTS CRASH INTO THE 40S AND TEMPERATURES ONLY RECOVER INTO THE LOW TO MID 70S. HIGH PRESSURE WILL BUILD INTO THE AREA TONIGHT. WITH WINDS SUBSIDING AND TEMPERATURES FALLING INTO THE LOW TO MID 40S. ANOTHER PLEASANT DAY IS ANTICIPATED FOR WEDNESDAY AS WE REMAIN UNDER THE INFLUENCE OF HIGH PRESSURE WHICH SHOULD PROVIDE PLENTY OF SUNSHINE ONCE AGAIN. A COLD FRONT WILL PASS THROUGH AROUND DAYBREAK.
428 AM CDT TUE MAY 12 2015 EARLY MORNING WATER VAPOR SATELLITE IMAGERY SHOWS AN UPPER RIDGE OVER THE ROCKIES AHEAD OF AN UPPER TROUGH NEAR NORTHERN CALIFORNIA. WHERE SURFACE DEW POINTS HAVE CLIMBED INTO THE LOW 40S EARLY THIS MORNING. WITH HIGHS IN THE UPPER 60S TO THE LOWER 70S. IN ADDITION WEAK UPPER RIDGE SHIFTS EASTWARD ALLOWING FOR SOUTHERLY SURFACE WINDS TO CONTINUE THE TRANSPORT OF ABUNDANT LOW-LEVEL MOISTURE INTO THE AREA. GENERALLY WENT WITH WPC GUIDANCE WHERE THE HIGHEST RAINFALL TOTALS WILL BE LOCATED ACROSS THE EASTERN PANHANDLES. WHERE THE CORE OF THE LOW-LEVEL JET WILL SET UP.
411 AM CDT TUE MAY 12 2015 HIGH PRESSURE CENTERED ACROSS KS MOVES EAST INTO MISSOURI TODAY. LOW PRESSURE WILL BEGIN TO ORGANIZE ACROSS THE NRN HIGH PLAINS THIS AFTERNOON. THESE WINDS SHOULD CONTINUE TONIGHT AS THE LOW LEVEL JET FORMS AND STRENGTHENS TO AROUND 50 KT. THE TEMPERATURE FORECAST TODAY FOLLOWS THE WARMER SIDE OF THE MODEL CONSENSUS. A LARGE UPPER TROUGH WILL BE TAKING SHAPE ALONG THE WEST COAST MID TO LATE WEEK.
TEMPS ARE STILL LIKELY TO BOTTOM OUT AROUND FREEZING OR EVEN BELOW DEPENDING ON CLOUD COVER AND LOCAL VALLEY EFFECTS. DEBATED ON FREEZE WARNING BUT NOT ENOUGH CONFIDENCE AT THIS POINT IN WIDESPREAD TEMPS BELOW FREEZING OR IN THE UPPER 20S. ANY INCREASE IN HIGH CLOUDS TONIGHT COULD KEEP TEMPS MORE IN THE LOW 30S. BETTER PRECIP CHANCES ARRIVE WEDNESDAY AND WEDNESDAY NIGHT WHEN WARM FRONT SETS UP ACROSS THE AREA. MODELS ARE ALSO TRENDING WARMER WITH WEDNESDAY SO HAVE INCREASED HIGHS.
TODAY THROUGH WEDNESDAY NIGHT WESTERN CONUS UPPER LEVEL TROUGHING ONGOING THIS MORNING WITH A LOCAL WAA RESPONSE. ONGOING PRESSURE FALLS PER THE ADVANCING WESTERN CONUS UPPER TROUGH WILL SUPPORT A LLJ TONIGHT WITH SOME FORCING FOR ASCENT PER A SLOW MOVING NW CONUS UPPER TROUGH GRAZING THE NORTHERN PLAINS TONIGHT. LEE SIDE TROUGH WILL SHIFT EAST ACROSS THE FA WED MORNING AND STALL WITH THE SOUTHERN PLAINS IMPULSE SHIFTING NORTH. STRONG SE WINDS UNDER MAY SUN SHOULD MIX WARMER AIR DOWN WITH NO PROBLEM.
627 AM EDT TUE MAY 12 2015 OUR RECENT STRING OF WARM DAYS AND MILD NIGHTS WILL BE CUT TODAY AS A STRONG COLD FRONT PUSHES EAST ACROSS THE STATE. COOLER.
SOUTHWEST FLOW ALOFT AHEAD OF A LOW PRESSURE SYSTEM ALONG THE OREGON COAST WILL PUSH EXTENSIVE MOISTURE INTO CENTRAL/SOUTHWEST MT TONIGHT.
607 AM EDT TUE MAY 12 2015 SUMMERTIME WARMTH AND HUMIDITY WILL COME TO AN END TODAY AS A VIGOROUS UPPER TROF AND ASSOCIATED COLD FRONT CROSSES THE REGION. COOLER.
346 AM EDT TUE MAY 12 2015 CLOUDS WILL INCREASE THIS MORNING IN THE WAKE OF A COLD FRONT THAT BROUGHT COOLER AND DRIER AIR TO THE REGION OVERNIGHT.
630 AM EDT TUE MAY 12 2015 LOW PRESSURE WILL TRACK ACROSS THE NORTH TODAY. THE LOW WILL CONTINUE INTO THE MARITIMES TONIGHT. A COLD FRONT WILL THEN PUSH SOUTH ACROSS THE REGION LATE TONIGHT INTO WEDNESDAY MORNING. EXPECT THESE SHOWERS WL BCM MORE WIDESPREAD IN CVRG BTWN 12Z AND 18Z TDA AS APPCHG TROF/CDFNT MVS TWD AREA. LOW PRESSURE WILL BE EXITING INTO THE MARITIMES EARLY WEDNESDAY MORNING. A TROUGH AND ASSOCIATED COLD FRONT TRAILING ACROSS OUR REGION WILL BRING A CLOUDY AND CHILLY MORNING ON WEDNESDAY WITH SOME SHOWERS, MAINLY ACROSS THE NORTH. THE AIR MAY BE COLD ENOUGH FOR A BIT OF WET SNOW OR SLEET TO MIX IN OVER THE HIGHEST ELEVATIONS OF THE NORTH AND WEST EARLY WEDNESDAY MORNING.
1155 PM MDT MON MAY 11 2015 MAINLY CLEAR ACROSS THE CWA OVERNIGHT AS AN UPPER RIDGE SHIFTS EAST ACROSS THE REGION. WARMER TEMPS TO MAKE A RETURN ON TUESDAY AS RETURN FLOW SETS UP AND 700MB TEMPS WARM TO AROUND 7C ON SWLY UPPER FLOW IN THE WAKE OF THE UPPER RIDGE AXIS. A TROUGH WILL BE IN PLACE ACROSS THE WESTERN CONUS WHICH WILL LEAD TO THE CHANCES FOR PRECIPITATION EACH DAY BUT CONFIDENCE IS LOW AS TO WHERE DYNAMIC FEATURES WILL BE LOCATED.
AN UPPER LEVEL LOW WILL CONTINUE SHOWERS AND CLOUDS ACROSS SW WASHINGTON AND NW OREGON TODAY. THE UPPER LOW WILL MOVE EAST OF THE CASCADES TONIGHT AND WEDNESDAY BUT WRAP AROUND SHOWERS WILL CONTINUE OVER THE AREA.
AN EXTENSIVE WESTERN ATLANTIC RIDGE REACHES WELL ACROSS THE NORTHERN HALF OF THE SUNSHINE STATE AND INTO THE GULF OF MEXICO.
/ISSUED 300 AM CDT TUE MAY 12 2015/ A LOW AMPLITUDE UPPER RIDGE ACROSS THE SOUTHERN PLAINS WILL ALLOW FOR ONE MORE DAY OF DRYING OUT TODAY. A FAST MOVING UPPER TROUGH AND QUICK LOW LEVEL MOISTURE RETURN WILL RAISE THUNDERSTORM CHANCES ONCE AGAIN ON WEDNESDAY.
CLOSED LOW OVER SW OREGON THIS MORNING WILL TRACK INTO SE OREGON BY EVENING BEFORE LIFTING NE-WARD OVERNIGHT. SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP IN THE VICINITY OF THE LOW CENTER WITH THE FOCUS OF ACTIVITY OVER HARNEY. THE CHANCE OF SHOWERS AND STORMS INCREASES ACROSS THE REST OF SW IDAHO AND SE OREGON EARLY THIS EVENING IN RESPONSE TO THE EASTWARD SHIFT OF THE UPPER LOW. PRECIPITATION TAPERS OFF FROM SOUTH TO NORTH OVERNIGHT AS THE UPPER LOW TRACKS TOWARD THE ID PANHANDLE WEDNESDAY MORNING. FOR WEDNESDAY A WEAK UPPER RIDGE WILL CAP SHOWER/STORM DEVELOPMENT FOR MUCH OF SE OREGON AND LOWER ELEVATIONS OF SW IDAHO WHILE ISOLATED SHOWERS AND THUNDERSTORMS FORM OVER HIGHER MTNS OF CENTRAL IDAHO.
WINDS SHOULD THEN DROP OFF AND ALLOW TEMPS TO REACH THE LOW-MID 30S. A LARGE AREA OF LOW PRESSURE WILL DROP SOUTH ACROSS THE WESTERN STATES OVER THE MIDDLE OF THE WEEK. EXPECT A WEAK UPPER LEVEL DISTURBANCE/OPEN WAVE TO BE LIFTED NORTHWARD ACROSS THE PLAINS AS A LARGE AREA OF LOW PRESSURE CIRCULATES ACROSS THE WESTERN STATES.
346 AM EDT TUE MAY 12 2015 SUMMERTIME WARMTH AND HUMIDITY WILL COME TO AN END TODAY AS A VIGOROUS UPPER TROF AND ASSOCIATED COLD FRONT CROSSES THE REGION. COOLER.
620 AM EDT TUE MAY 12 2015 A COLD FRONT WILL CROSS THE AREA TODAY. DRY WEATHER RETURNS THROUGH THE MIDDLE OF THE WEEK UNDER HIGH PRESSURE. MODELS STILL SHOWING ADVANCING COLD FRONT MOVING THROUGH THE REGION THROUGH THE DAYTIME HOURS TODAY. COOLER AND DRIER AIR WILL BUILD INTO THE REGION TONIGHT AS HIGH PRESSURE BUILDS IN FROM THE EAST. PLENTY OF SUN AND LESS HUMID CONDITIONS ARE EXPECTED ON WEDNESDAY WITH MAX TEMPERATURES ABOUT 10 DEGREES COOLER THAN TODAY IN THE LOWER 80S AND NO CHANCE OF RAIN DUE TO DRIER AIR.
205 AM CDT TUE MAY 12 2015 A COOLER AND DRIER WEATHER PATTERN WILL TAKE SHAPE OVER THE NEXT COUPLE OF DAYS AS HIGH PRESSURE BUILDS EAST FROM THE PLAINS INTO THE MISSISSIPPI AND OHIO VALLEYS. HIGH TEMPERATURES TODAY WILL ONLY REACH THE LOWER 70S.
COOLER DRIER WEATHER IS EXPECTED THROUGH MIDWEEK AS HIGH PRESSURE BUILDS ACROSS THE OHIO VALLEY.
A strong upper level trough will be lifting north-northeast across the Southern Plains during the day.
/ISSUED 357 PM CDT MON MAY 11 2015/ THE COLD FRONT THAT MOVED THROUGH NORTH TEXAS OVERNIGHT WAS NEARLY STALLED JUST SOUTH OF THE FORECAST AREA THIS AFTERNOON. MORE NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ON TUESDAY AS UPPER LEVEL DIFFLUENCE INCREASE ACROSS THE REGION IN RESPONSE TO A DEEPENING WEST COAST TROUGH.
201 AM EDT TUE MAY 12 2015 LOW PRESSURE WAS OVER THE GREAT LAKES WITH A COLD FRONT TRAILING INTO EASTERN TEXAS.
431 AM EDT TUE MAY 12 2015 ALOFT - A CLOSED LOW WAS ON THE PACIFIC NORTHWEST COAST. RIDGING OVER THE GULF OF MEXICO REACHED NORTHWESTWARD TO THE NORTHERN HIGH PLAINS. AND BROAD TROUGHING WAS FROM HUDSON BAY TO THE UPPER MIDWEST. SURFACE - HIGH PRESSURE SPRAWLED FROM CENTRAL CANADA INTO MOST OF THE SOUTHERN PLAINS. A LOW IN SOUTHEAST ONTARIO/ THE SURFACE REFLECTION OF THE UPPER TROUGH/ TRAILED A COLD FRONT THAT ARCED SOUTH AND SOUTHWEST TO THE WESTERN GULF COAST. AND ATLANTIC HIGH PRESSURE RIDGED ACROSS NORTH-CENTRAL FL TO THE CENTRAL GULF. THE UPPER RIDGE DOMINATES AS IT PIVOTS OVER THE GULF WITH IT/S AXIS MOVING INTO THE UPPER MID-WEST. THE ATLANTIC RIDGE ACROSS FL BEGINS TO PULL AWAY TO THE EAST. THE RIDGING ALOFT WILL HELP KEEP TEMPERATURES ABOVE NORMAL.
638 AM EDT TUE MAY 12 2015 COLD FRONT CROSSES THIS MORNING. HIGH PRESSURE BRINGS NEAR NORMAL TEMPERATURES FOR MID WEEK.
1108 PM MDT MON MAY 11 2015 SHORT WAVE RIDGE OF HIGH PRESSURE IS CURRENTLY SHIFTING EASTWARD ACROSS THE WESTERN SLOPE. HIGH TEMPS TODAY WILL BE SEVERAL DEGREES COOLER THAN USUAL THOUGH OVERNIGHT LOWS WILL BE NEAR NORMAL.
128 AM EDT TUE MAY 12 2015 CLOUDS WILL INCREASE THIS MORNING IN THE WAKE OF A COLD FRONT THAT BROUGHT COOLER AND DRIER AIR TO THE REGION OVERNIGHT.