Aikyam-Lab/Synoptic-Bench huggingface dataset:
1226 AM CDT FRI OCT 30 2015 WINDS WILL SHIFT AND BECOME SOUTHERLY OVERNIGHT AS AN AREA OF HIGH PRESSURE ACROSS CENTRAL KANSAS CONTINUES TO TRACK SOUTHEAST AND SOUTHERLY RETURN FLOW IS REALIZED ACROSS THE LOCAL AREA. EXPECT OVERNIGHT TEMPERATURES TO BE MODERATED SOME BY THIS WARMER/STEADY SOUTHERLY FLOW. WHILE A FEW SUBFREEZING TEMPERATURES CANNOT BE COMPLETELY RULED OUT. MOST AREAS SHOULD BE 5-7 DEGREES ABOVE THIS MORNINGS SUB-FREEZING LOWS. THE MAIN UPPER LEVEL LOW WILL THEN PASS ACROSS THE AREA LATE TOMORROW NIGHT BRINGING ADDITIONAL CHANCES FOR RAINFALL. AN OPEN WAVE TROUGH WILL SWING ACROSS TEXAS AND BRING A DECENT AMOUNT OF RAIN TO THE FORECAST AREA FRIDAY NIGHT INTO SATURDAY. THIS RAIN QUICKLY TAPERS OFF FROM WEST TO EAST BY EARLY SATURDAY MORNING WITH THE PASSING OF THE WEAK COLD FRONT. AS THE UPPER LEVEL TROUGH SHIFTS EASTWARD.
355 AM EDT FRI OCT 30 2015 PARTLY SUNNY AND DRY CONDITIONS EXPECTED TODAY AS HIGH PRESSURE SLIDES OVER THE AREA. HIGH TEMPERATURES WILL BE IN THE LOW TO MID 50S WITH LOWS TONIGHT AROUND 40 DEGREES. WEAK LOW LEVEL CONVERGENCE AMID ABUNDANT MOISTURE TRAPPED UNDER INVERSION MAY CONTINUE TO GENERATE SOME LIGHT DRIZZLE/SPRINKLES THROUGH THE EARLY MORNING AS SURFACE PRESSURE TROUGH PASSES. EXPECT AT LEAST SOME STRATOCU FOR MUCH OF THE DAY GIVEN PERSISTENT THERMAL TROUGH AND LAKE MOISTURE PLUME BUT WILL STILL BE MUCH WARMER THAN YESTERDAY. DECREASING CLOUDS AND SLOWLY MODERATING THERMAL PROFILES SHOULD ALLOW LATE DAY HIGHS IN THE LOW TO MID 50S. SOUTHWEST FLOW AND WARM/MOIST AIR ADVECTION RAMP UP OVERNIGHT AS NEXT LONGWAVE TROUGH APPROACHES.
215 AM MDT FRI OCT 30 2015 MODELS REMAIN IN GOOD AGREEMENT TODAY WITH AN UPPER LOW/TROUGH APPROACHING THE CENTRAL AND SOUTHERN ROCKIES TONIGHT AND EARLY FRIDAY. AT THIS TIME BASED ON THE LATEST TIMING OF THIS IMPROVING LIFT AHEAD OF THE UPPER LEVEL TROUGH FROM THE GFS AND NAM WILL LEAN TOWARDS DELAYING THE ONSET OF THE STEADIER PRECIPITATION SPREADING INTO NORTHWEST KANSAS UNTIL AFTER 12Z FRIDAY. GIVEN THE INCREASE IN CLOUDS TONIGHT OVERNIGHT LOWS WILL STAY ABOVE FREEZING WHILE CLOUD COVER AND PRECIPITATION DURING THE DAY WILL RESULT IN HIGHS COOLER THAN WHAT THE LATEST MET AND MAV SUGGESTS. HAVE THEREFORE KEPT THE HIGHEST CHANCES FOR PRECIPITATION EAST OF ROUGHLY A MCCOOK TO GOODLAND TO TRIBUNE LINE. PERIOD STARTS OUT WITH A NEW WESTERN TROUGH DEVELOPING/DEEPENING. THERE ARE DIFFERENCES IN HOW THEY HANDLE/DEVELOP THIS TROUGH.
SHORT WAVE MID LEVEL TROUGH MOVING EAST INTO THE NORTHERN PLAINS THIS MORNING. VERY LIGHT RADAR RETURNS SHOWING UP ALONG A WARM FRONTAL BOUNDARY ACROSS EASTERN MONTANA. CLEARING SKIES FROM WEST TO EAST ALONG TO WEST OF THE S/WV AND SURFACE WARM FRONT AS THEY PROGRESS EAST ACROSS THE DAKOTAS TODAY. A STEADY WEST-SOUTHWEST MIXING WIND COUPLED WITH WAA WILL SEE DAYTIME HIGHS MAINLY IN THE LOW TO MID 50S. NEXT S/WV TROUGH. A LONGWAVE WESTERN CONUS UPPER LEVEL TROUGH HAS CONSISTENTLY BEEN FORECAST TO DEVELOP OVER THE PAST SEVERAL DAYS OF MODEL CYCLES.
421 AM CDT FRI OCT 30 2015 AMPLE LOW LEVEL MOISTURE ADVECTION CONTINUED EARLY THIS MORNING WELL AHEAD OF A TIGHT UPPER CYCLONE NEAR TOMBSTONE ARIZONA AT 4 AM. HOWEVER AM TRENDING A BIT SLOWER WITH THIS FRONT AS THE NON-GFS GUIDANCE IS A BIT SLOWER WITH THE UPPER LOW AND AS A RESULT KEEPS THE BOUNDARY STATIONARY LONGER. PRECIP WILL TREND LESS IN COVERAGE AFTER MIDNIGHT AS THE UPPER TROUGH AXIS SHIFTS FROM WEST TO EAST AND MIXING RATIOS PLUMMET BEHIND THE COLD FRONT.
219 AM EDT FRI OCT 30 2015 DEEP LOW PRESSURE WILL LIFT NORTHEAST THROUGH EASTERN CANADA AND WILL PUSH A MAINLY DRY AND COLDER AIRMASS INTO THE REGION TODAY AND SATURDAY.
HIGH PRESSURE WILL MOVE OVER THE REGION ON SATURDAY. CIRCULATION AROUND INTENSE ARE OF LOW PRESSURE OVER THE NORTHEASTERN PORTION OF CANADA WILL CONTINUE TO IMPORT COLD AIR MASS ACROSS THE REGION TODAY. THIS LOW ALONG WORKING IN CONJUNCTION WITH STRONG HIGH PRESSURE TO THE SOUTHWEST WILL ALSO RESULT IN WINDY CONDITIONS TODAY. HIGH PRESSURE WILL APRROACH THE AREA FROM THE WEST TONIGHT THEN CREST OVER THE REGION EARLY SATURDAY.
The only question is how fast the high and mid level clouds will move in over the southeastern areas by sunrise. There will be perhaps a slight rise by sunrise due to a light southeast wind on the back side of the high pressure by morning over western areas. The upper level trough will move through on Saturday with rain likely in the morning and slowly tapering off from west to east Saturday afternoon into Saturday evening.
AN UPPER-LEVEL TROUGH WAS MOVING EAST ACROSS AZ/NM EARLY THIS MORNING. INCREASING LARGE SCALE FORCING FOR ASCENT AHEAD OF THE APPROACHING TROUGH. THIS TREND WILL CONTINUE TODAY AS THE TROUGH CONTINUES TO ADVANCE EAST ACROSS THE SOUTHERN ROCKIES. THE UPPER TROUGH WILL MOVE OVER THE SOUTHERN HIGH PLAINS TONIGHT. WITH RAIN CHANCES DIMINISHING FROM WEST TO EAST AS SUBSIDENCE SETS IN BEHIND THE TROUGH AXIS.
411 AM EDT FRI OCT 30 2015 A DRY PRESSURE RIDGE MOVING INTO THE FORECAST AREA FROM THE WEST TODAY WILL EXTEND THROUGH THE AREA TONIGHT AND SATURDAY.
230 AM EDT FRI OCT 30 2015 LOW PRESSURE OVER EASTERN CANADA WILL RESULT IN A COOL WESTERLY FLOW OF AIR ACROSS THE AREA TONIGHT INTO FRIDAY. SCATTERED LIGHT SHOWERS OR SPRINKLES COULD ACCOMPANY A WEAK PRESSURE TROUGH EARLY FRIDAY. THEN HIGH PRESSURE WILL BUILD ACROSS THE AREA LATE FRIDAY INTO SATURDAY BRINGING DRY COOL WEATHER. SOUTHWEST FLOW AHEAD OF NEXT SFC TROF WILL KEEP ANY PRECIP NORTH OF FA UNTIL AFTER MIDNIGHT WHEN LOW LEVEL FLOW WILL VEER ENOUGH FOR ACTIVITY TO DROP INTO NRN ONEIDA COUNTY. SHOWERS EXITED EARLY THIS AFTN WITH THE COLD FRONT. ONLY EXPECT A DUSTING AT THE HIGHEST ELEVATIONS OF THE TUG AND NORTHERN SUSQUEHANNA REGION. HIGH PRESSURE WILL BRING CLEAR CHILLY WEATHER TO THE AREA FRIDAY NIGHT WITH LOW TEMPERATURES DROPPING TO NEAR FREEZING ACROSS MUCH OF THE AREA.
358 AM EDT FRI OCT 30 2015 HIGH PRESSURE WILL BUILD OVER THE REGION TONIGHT THROUGH EARLY SATURDAY.
306 AM CDT FRI OCT 30 2015 Progressive upper low was currently moving through southern AZ with an expanding area of showers/thunderstorms noted across western TX. Positive tilt trof axis will push through the area by Saturday.
106 AM EDT FRI OCT 30 2015 A WEAK SECONDARY COLD FRONT WILL CROSS THE REGION THIS EVENING AND WILL MOVE OFFSHORE OVERNIGHT. FOLLOWED BY HIGH PRESSURE THROUGH SATURDAY.
647 AM EDT FRI OCT 30 2015 HIGH PRESSURE CROSSES TODAY AND TONIGHT.
CLOCKWISE FLOW AROUND THE HIGH HAS RESULTED IN MAINLY SOUTHERLY/SOUTHWESTERLY FLOW ACROSS THE REGION. SOME CIRRUS HAS MOVED INTO WESTERN PORTIONS OF THE CWA AHEAD OF LONGWAVE TROUGH IN THE WESTERN CONUS. CLOUDS WILL CONTINUE TO MOVE INTO THE REGION TONIGHT AS THE TROUGH PROGRESSES EASTWARD.
AHEAD OF AN UPPER LEVEL TROUGH OVER ERN AZ/WRN NM AND NRN OLD MX. CAN/T RULE OUT A FEW SPRINKLES ASSOCIATED WITH POSSIBLE ACCAS/ELEVATED INSTABILITY DEVELOPING WELL E OF THE TROUGH OVER THE REGION.
447 AM CDT FRI OCT 30 2015 Scattered showers and thunderstorms are moving across the area this morning as a result of increased lift from an upper level trough centered over Arizona/New Mexico. Temperatures today will be in the lower to mid 70s across the Permian Basin and Trans Pecos. Showers may linger into the overnight period and into Saturday across eastern portions of the CWA as the upper trough passes overhead. A cold front will push through the area on Saturday cooling temperatures down into the mid 60s to lower 70s across most of the CWA. Any remaining precipitation is expected to be out of the area by Saturday night as the upper trough moves east.
323 AM CDT FRI OCT 30 2015 AN AREA OF LOW PRESSURE AND SURFACE WARM FRONT WILL SLIDE ACROSS THE REGION TODAY.
SOME CLEARING ACROSS THE ARROWHEAD TONIGHT WITH TEMPERATURES DROPPING INTO THE LOWER 20S AND POSSIBLY UPPER TEENS IN THIS CLEARING POCKET. A RIDGE OF HIGH PRESSURE WILL BEGIN TO BUILD EASTWARD FROM THE DAKOTAS TONIGHT AND ACROSS THE UPPER MIDWEST AND WRN GREAT LAKES DURING THE DAY FRIDAY. THE COLD AND MOIST AIR MASS WILL HAVE A HARD TIME BEING SCOURED OUT BY THE INCOMING RIDGE AND KEEP SKIES MOSTLY CLOUDY THROUGH THE DAY. THEN A DEEPENING UPPER TROUGH OVER THE WESTERN CONUS WILL DEVELOP AND THE FLOW WILL BACK TO SOUTHWEST BY MID WEEK.
THE MAIN UPPER LEVEL LOW WILL TRACK ALONG THE U. A COLD FRONT WILL MOVE SOUTH ACROSS NORTHEAST COLORADO DURING THE MORNING HOURS.
325 AM EDT FRI OCT 30 2015 HIGH PRESSURE IS SLOW TO BUILD INTO THE MID ATLANTIC STATES FROM THE WEST THROUGH TONIGHT. THE HIGH MOVES OFF THE COAST SATURDAY. LOW PRESSURE APPROACHES THE LOCAL AREA FROM THE SOUTHWEST LATE IN THE WEEKEND. HIGH PRESSURE SETTLES TO THE NORTH OF THE AREA LATER TUE THROUGH THE END OF THE WEEK WHICH SHOULD KEEP THINGS DRY. HIGHS IN THE LOW/MID 70S TUE-THU. COLD FRONT WAS PUSHING INTO NE NC WITH BKN MID LEVEL CLOUDS WITH BASES BETWEEN 5 AND 8 K FT ALONG AND JUST BEHIND THE FRONT. NORTHERLY WINDS DEVELOP OVER THE WATERS EARLY FRIDAY MORNING AS HIGH PRESSURE BUILDS TO THE WEST.
414 AM EDT FRI OCT 30 2015 HIGH PRESSURE WILL MOVE ACROSS THE REGION TODAY AND TONIGHT. GIVEN EXPECTED CLOUD COVER HAVE LEANED TOWARDS COOLER MOS GUIDANCE FOR HIGHS.
301 AM EDT FRI OCT 30 2015 A DRY PRESSURE RIDGE MOVING INTO THE FORECAST AREA FROM THE WEST TODAY WILL EXTEND THROUGH THE AREA TONIGHT AND SATURDAY.
634 AM EDT FRI OCT 30 2015 SECONDARY PUSH OF COOLER AIR WILL MOVE INTO THE REGION TODAY. AS HIGH PRESSURE BUILDS INTO THE NORTHEAST. THAT HIGH PRESSURE WILL BE SHORT LIVED.
353 AM EDT FRI OCT 30 2015 SECONDARY PUSH OF COOLER AIR WILL MOVE INTO THE REGION TODAY. AS HIGH PRESSURE BUILDS INTO THE NORTHEAST. THAT HIGH PRESSURE WILL BE SHORT LIVED.
/ISSUED 1048 PM EDT THU OCT 29 2015/ COLD FRONT CONTINUES TO PUSH THROUGH THE LOCAL AREA RESIDING ROUGHLY ALONG AN ALBANY TO MACON LINE. /ISSUED 257 PM EDT THU OCT 29 2015/ A COLD FRONT MOVING ACROSS THE AREA IS CAUSING A CHANCE OR LIGHT RAIN OR SHOWERS. HIGH PRESSURE BUILDS FOR FRIDAY WITH A SUNNY DAY IN STORE AND THE CLEAR OR NEARLY CLEAR SKIES WILL CONTINUE INTO FRIDAY NIGHT.
A mid afternoon surface analysis showed Canadian high pressure centered over Kansas while an area of low pressure was located north of the Great Lakes region. For this evening, plan on winds to slacken off toward sunset as the aforementioned high pressure builds eastward toward the area helping to relax the pressure gradient. Otherwise, as the high settles overhead and winds fall below 5 kts, radiational cooling should allow readings to fall into the 30s for most areas. The coolest spots may dip down to the 32-34 range while the warmer urban areas stay around 40. Expect sunny skies and light winds for Friday as high pressure builds overhead.
156 AM EDT FRI OCT 30 2015 WINDS WILL DIMINISH TONIGHT AS HIGH PRESSURE BUILDS EAST INTO THE OHIO VALLEY. THIS HIGH WILL MOVE EAST OF THE REGION BY SATURDAY. PREVIOUS DISCUSSION > DEEP MID/UPR LEVEL LOW OVER THE GREAT LAKES TO TRANSLATE NE INTO SE CANADA THIS EVENING AS LONG WAVE RIDGE MOVES INTO THE GREAT LAKES/MS VLY BY FRIDAY MORNING. BROAD MID LEVEL RIDGE TO FLATTEN AND BUILD ACRS THE REGION FRIDAY. AS THE LOWER CLOUDS DIMINISH. RANGING FROM THE LOWER 50S NORTH TO THE UPPER 50S SOUTH. EXPECT LOWS FROM THE UPPER 30S EAST TO THE LOWER 40S WEST. HIGHS SAT EXPECTED TO RANGE FROM THE MID 50S NW TO THE LOWER 60S SE. LOWS WILL BE MILD FROM THE UPPER 40S NW THE LOWER 50S SE.
333 AM EDT FRI OCT 30 2015 A WEAK COLD FRONT PASSES THROUGH THIS AFTERNOON. HIGH PRESSURE BUILDS IN FROM THE WEST TONIGHT AND SLIDES OFFSHORE SATURDAY AND SATURDAY NIGHT.
412 AM CST TUE NOV 24 2015 THE ZONAL UPPER LEVEL FLOW OVER TEXAS WILL BECOME MORE AMPLIFIED BY THE END OF THE WEEK AS A LOW PRESSURE TROUGH DEVELOPS OVER THE NORTHERN PLAINS AND ROCKIES AND HIGH PRESSURE DEVELOPS OVER THE GULF OF MEXICO.
A PASSING COLD FRONT WILL BRING RAIN AND SNOW SHOWERS ACROSS NORTHWESTERN CALIFORNIA TODAY. THE COLD FRONT MADE LANDFALL EARLY THIS MORNING BRINGING MODERATE TO HEAVY RAIN ALONG WITH GUSTY WINDS TO NORTHWESTERN CALIFORNIA. TEMPERATURES WILL BE UNSEASONABLY COLD OVER THE NEXT SEVERAL DAYS AS THE COLD CORE TROUGH SHIFTS OVER NORTHERN CALIFORNIA. EVEN COASTAL AREAS WILL SEE NEAR FREEZING TEMPERATURES WITH SOME INTERIOR VALLEYS FALLING INTO THE UPPER 20S. WEDNESDAY NIGHT WILL BE THE COLDER NIGHT OF THE TWO BUT DEVELOPING CLOUD COVER ACROSS INTERIOR VALLEYS SHOULD KEEP TEMPERATURES WARMER BY A FEW DEGREES.
Cold front is just off the far northwest corner of California early this morning. It may bring a few inches of snowfall accumulation to the higher terrain of Lake County as well as areas of the Motherlode toward Wednesday morning. The snow should be the light fluffy type at the higher elevations due to the amount of cold air. The low will linger over the Great Basin through Thanksgiving before retrograding back into NorCal late in the week.
The low level flow will turn more easterly with a slight increase in moisture and a few more passing clouds compared to yesterday. Afternoon highs are expected to be mainly in the low to mid 60s, except near 70 across the southeast big bend.
401 AM CST TUE NOV 24 2015 (Today and Tonight) Currently, zonal flow aloft prevails across the Southern Plains but will transition to southwest flow by tonight ahead of a large upper low digging south across the Pacific northwest. At the surface, a lee trough will develop today, with breezy south winds developing. The low clouds will scatter out across much of the area by this afternoon, with partly cloudy skies expected. Cloud cover and increasing low level moisture will result in warmer temperatures tonight, with lows in the mid and upper 50s.
HIGH PRESSURE CENTERED OVER THE CAROLINA'S TODAY WILL BE REINFORCED AND LIFT SLIGHTLY NORTH AND EAST AND BE LOCATED OVER THE NEW ENGLAND STATES BY LATE TONIGHT. RIDGING FROM THE HIGH PRESSURE WILL CONTINUE OVER OUR AREA TODAY AND TONIGHT WITH LITTLE CHANGE. HIGHS TODAY SLIGHTLY WARMER THAN YESTERDAY. IN THE LOW TO MID 60S ACROSS THE AREA. LOWS TONIGHT ALSO A LITTLE WARMER THAN PAST TWO NIGHTS.
1055 AM EST TUE NOV 24 2015 THE AVIATION SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE STRETCHING FROM THE UPPER MIDWEST ACROSS THE OHIO VALLEY TO THE DEEP SOUTH WILL DRIFT SLOWLY EAST OVER THE NEXT FEW DAYS.
655 AM EST TUE NOV 24 2015 HIGH PRESSURE WILL BUILD NORTH TODAY AND EXTEND OVER THE AREA FROM THE NORTHEAST THROUGH THE END OF THE WEEK. A COLD FRONT WILL MOVE THROUGH LATE THIS WEEKEND. LATEST SFC ANALYSIS SHOWS 1029MB HIGH PRESSURE CENTERED OVER THE CAROLINAS. LOW LEVEL THICKNESS VALUES AND N/NW FLOW SUPPORT HIGHS IN THE LOW/MID 50S. LATEST OBS SHOW MOST TEMPS AT OR BELOW FREEZING. HIGH PRESSURE BECOMES CENTERED NORTH OF THE AREA TONIGHT. LOWS IN THE LOWER TO MID 30S INLAND.
1016 AM EST TUE NOV 24 2015 THE NEAR TERM SECTION HAS BEEN UPDATED BELOW HIGH PRESSURE STRETCHING FROM THE UPPER MIDWEST ACROSS THE OHIO VALLEY TO THE DEEP SOUTH WILL DRIFT SLOWLY EAST OVER THE NEXT FEW DAYS.
THIS WILL BRING ABOUT MODEST LOW LEVEL MOISTURE RETURN WITH A GENERAL INCREASE IN SKY COVER WED INTO WED NIGHT AND NOTABLY WARMER OVERNIGHT CONDITIONS BY WED NIGHT/THURS MORNING. /DL/ GLOBAL MODELS CONTINUE TO PORTRAY A COMPLEX SPLIT FLOW PATTERN DEVELOPING OVER THE CONUS THAT WILL FEATURE A BUILDING UPPER LEVEL RIDGE OVER THE GULF COAST REGION. MODEL CONSENSUS CONTINUES TO TREND STRONGER WITH THE UPPER RIDGE AND LESS AGGRESSIVE AND PHASED WITH THE NORTHERN STREAM. BUT THAT APPEARS A "LITTLE" LESS CERTAIN NOW GIVEN LESS BAROCLINITY AND GREATER RIDGING.
941 AM EST TUE NOV 24 2015 HIGH PRESSURE WILL RIDGE ACROSS THE STATE FROM THE NORTH FOR THE NEXT FEW DAYS.
WITH HIGH PRESSURE IN CONTROL. LOOKS LIKE OUR COLDEST VALLEYS ARE GOING TO END UP RIGHT AT 20 DEGREES THIS MORNING WHILE RIDGES ARE HOLDING IN THE MID 30S. HIGH PRESSURE REMAINS ENTRENCHED ACROSS THE REGION. WITH THE HIGH SHIFTING SLIGHTLY EAST. SLIGHTLY BETTER SOUTH WINDS MAY KEEP TEMPERATURES A TOUCH WARMER. BUT STILL BELOW FREEZING FOR MOST OF THE AREA. THE HIGH SLIDES FURTHER EAST WITH SOUTHEAST WINDS STRENGTHENING. THIS SHOULD SEND HIGHS EVEN HIGHER INTO THE LOWER 60S UNDER MOSTLY SUNNY SKIES. BROAD EAST COAST RIDGING WILL GENERALLY HOLD THROUGH THANKSGIVING DAY BEFORE RIPPLES OF ENERGY.
/ISSUED 214 AM EST TUE NOV 24 2015/ HIGH PRESSURE WILL CONTINUE TO MOVE SLOWLY EAST FROM THE SOUTHEASTERN UNITED STATES INTO THE WESTERN ATLANTIC WATERS THROUGH END OF THE WEEK. THE HIGH OVER THE WESTERN ATLANTIC WATERS CONTINUES TO MOVE FURTHER EAST INTO THE ATLANTIC WATERS.
BIGGEST DIFFERENCES HAVE TO DO WITH THE HANDLING OF AN UPPER LOW FORECAST TO BECOME CUTOFF FROM THE MAIN FLOW OVER CALIFORNIA OR NEVADA AND HOW/WHEN IT WILL EVENTUALLY REJOIN THE WESTERLIES. THIS LOW WILL BE THE DRIVING FORCE THAT BRINGS THE NEXT FRONT INTO AND POSSIBLY THROUGH THE LOCAL AREA. ONCE THE UPPER LOW STARTS MOVING.
STRONG UPPER LOW ALONG THE PACIFIC NORTHWEST COAST THIS MORNING WILL MOVE INTO NORTHERN AND CENTRAL NV TONIGHT AND WEDNESDAY BRINGING SNOW AND VERY COLD TEMPERATURES. ASSOCIATED COLD FRONT WILL MOVE INTO HUMBOLDT COUNTY LATE THIS AFTERNOON THEN MOVE THROUGH NORTHERN AND CENTRAL NV TONIGHT AND WEDNESDAY MORNING.
633 AM EST TUE NOV 24 2015 HIGH PRESSURE OVER THE MIDWEST WILL MOVE TO THE EAST COAST ON WEDNESDAY AS LOW PRESSURE MOVES INTO THE PLAINS. THUS ISSUED A FREEZING FOG ADVISORY THROUGH 900AM TO ACCOUNT FOR THE FOG AND POTENTIAL ICY SPOTS DUE TO SUB-FREEZING TEMPS. COMBINATION OF SHRTWV MOVG ACROSS SW CANADA AND UPR LOW DIGGING SE INTO THE PAC NW WILL STRENGTHEN RIDGE ALOFT MOVG INTO THE GRTLKS AND PROVIDE FAIR WX ACROSS OUR CWA TODAY/TONIGHT. SUB-FREEZING TEMPERATURES/HEAVY FROST ASSOCIATED WITH THE RADIATIONAL COOLING FOG MAY ALSO LEAD TO SOME SLICK SPOTS ON ROADS. SFC GRADIENT WILL STRENGTHEN TONIGHT AS LOW PRESSURE DEEPENS OVER THE PLAINS.
/issued 401 AM CST TUE NOV 24 2015/ (Today and Tonight) Currently, zonal flow aloft prevails across the Southern Plains but will transition to southwest flow by tonight ahead of a large upper low digging south across the Pacific northwest. At the surface, a lee trough will develop today, with breezy south winds developing. The low clouds will scatter out across much of the area by this afternoon, with partly cloudy skies expected. Cloud cover and increasing low level moisture will result in warmer temperatures tonight, with lows in the mid and upper 50s.
1010 AM EST TUE NOV 24 2015 HIGH PRESSURE WILL BUILD NORTH TODAY AND EXTEND OVER THE AREA FROM THE NORTHEAST THROUGH THE END OF THE WEEK. A COLD FRONT WILL APPROACH LATE THIS WEEKEND. LATEST SFC ANALYSIS SHOWS 1029MB HIGH PRESSURE CENTERED OVER THE CAROLINAS. LOW LEVEL THICKNESS VALUES AND N/NW FLOW SUPPORT HIGHS IN THE LOW/MID 50S. HIGH PRESSURE BECOMES CENTERED NORTH OF THE AREA TONIGHT. LOWS IN THE LOWER TO MID 30S INLAND.
A DEEPER TROUGH AXIS EXTENDS FROM EASTERN CANADA DOWN TO EAST OF THE BAHAMAS. AT THE SURFACE AND IN THE LOWER TO MID LEVELS. THE CENTER OF A STRONG 1030 MB PLUS ANTICYCLONE IS PARKED OVER THE CAROLINA PIEDMONT. COLD FRONT THAT WENT THROUGH YESTERDAY HAS CLEARED CUBA TO REACH THE NORTHWESTERN CARRIBEAN SEA. TEMPERATURES ARE IN THE LOWER 70S WITH DEWPOINTS RANGING FROM THE MID 50S TO THE LOWER 60S.
841 AM EST TUE NOV 24 2015 A WEAK TROUGH OF LOW PRESSURE WILL CROSS THE EASTERN GREAT LAKES EARLY TODAY. HIGH PRESSURE OVER THE OHIO VALLEY WILL SPREAD NORTH ACROSS THE LOWER GREAT LAKES THROUGH THANKSGIVING.
631 AM EST TUE NOV 24 2015 HIGH PRESSURE WILL BUILD OVER THE AREA TODAY INTO TONIGHT.
530 AM CST TUE NOV 24 2015 LATEST WATER VAPOR IMAGERY SHOWING A BROAD RIDGE OF HIGH PRESSURE OVER THE CENTRAL CONUS. DEEP TROUGH OFF THE PACIFIC NORTHWEST WAS PUSHING MOISTURE OVER THE RIDGE WITH A BAND OF ALTOCUMULUS EXTENDING FROM THE DAKOTAS THROUGH EASTERN IA MOVING INTO THE AREA. THIS WARMER/MOIST AIR OVERRIDING THE SNOW PACK IN PLACE ACROSS IA/IL/SOUTHERN MN/WI IS EXPECTED TO INCREASE STRATUS AND PRODUCE AREAS/WIDESPREAD DRIZZLE AND PATCHY FOG THROUGH THE DAY. WITH SOUNDINGS SUPPORTING CONTINUATION OF DRIZZLE AS LOWS FALL BACK SLIGHTLY INTO THE MIDDLE 30S TO THE LOWER 40S.
1001 AM EST TUE NOV 24 2015 HIGH PRESSURE BUILDS OVER THE AREA TODAY INTO TONIGHT.
706 AM EST TUE NOV 24 2015 A WEAK TROUGH OF LOW PRESSURE WILL CROSS THE EASTERN GREAT LAKES EARLY TODAY. HIGH PRESSURE OVER THE OHIO VALLEY WILL SPREAD NORTH ACROSS THE LOWER GREAT LAKES THROUGH THANKSGIVING.
608 AM EST TUE NOV 24 2015 A DEEP UPPER TROUGH WILL KEEP DRY CONDITIONS AND BELOW NORMAL TEMPERATURES OVER THE AREA TODAY. THE TROUGH WILL MOVE EAST OF THE AREA THROUGH MID WEEK. WITH HIGH PRESSURE MAINTAINING DRY WEATHER AND MODERATING TEMPERATURES.
658 AM EST TUE NOV 24 2015 A DEEP UPPER TROUGH WILL KEEP DRY CONDITIONS AND BELOW NORMAL TEMPERATURES OVER THE AREA TODAY. THE TROUGH WILL MOVE EAST OF THE AREA THROUGH MID WEEK. WITH HIGH PRESSURE MAINTAINING DRY WEATHER AND MODERATING TEMPERATURES.
AN UPPER LEVEL LOW WEST OF VANCOUVER ISLAND WILL MOVE SOUTH OFF THE COAST THIS MORNING. FREEZING RAIN. HIGH PRESSURE WILL BUILD INTO SOUTHEAST WASHINGTON WEDNESDAY. COLD AIR IS TRAPPED IN THE LOWER COLUMBIA BASIN WITH AREAS OF LIGHT FREEZING RAIN. FREEZING RAIN OR UNKNOWN PRECIP WITH BELOW FREEZING TEMPERATURES HAVE BEEN REPORTED YKM, PSC, PDT, ALW, DLS, AND PROSSER. TEMPERATURES AT MOST STATIONS IN THE COLUMBIA RIVER GORGE HAVE RISEN ABOVE FREEZING BUT POCKETS OF COLDER AIR PROBABLY REMAIN. ALL OTHER ZONES IN THE FREEZING RAIN ADVISORY STILL HAVE MAINLY BELOW FREEZING TEMPERATURES. I WILL CONTINUE THE FREEZING RAIN ADVISORIES AT THIS TIME. SNOW ADVISORIES ARE WILL START THIS MORNING OVER ALL OREGON ZONES NOT COVERED BY FREEZING RAIN ADVISORIES.
A WEAK UPPER TROUGH WILL PASS MAINLY TO THE NORTH EARLY THIS AFTERNOON. THIS WILL BE FOLLOWED BY A WEAK RIDGE AXIS THIS EVENING AND THEN INCREASING SOUTHWEST FLOW ALOFT LATER TONIGHT. IT IS THE LOW LEVELS WHICH RAISE SERIOUS COMPLICATIONS. CURRENT UPPER LEVEL TROUGH OVER WESTERN CANADA WILL SOON CLOSE OFF AND DIVE DOWN THE WEST COAST AND THEN INTO THE GREAT BASIN BY WEDNESDAY NIGHT. THE UPPER LEVEL PATTERN WILL THEN TURN INTO A REX BLOCK WITH LITTLE MOVEMENT TO THIS LOW UNTIL THE WEEKEND. THE POSITION OF THE UPPER LOW WILL SUSTAIN CONSTANT SOUTHWESTERLY FLOW ALOFT DRAWING IN COPIOUS AMOUNTS OF MOISTURE.
HIGH PRESSURE AT THE SURFACE AND RIDGING ALOFT IS CURRENTLY IN PLACE AND WILL REMAIN THAT WAY THROUGH THANKSGIVING DAY.
618 AM EST TUE NOV 24 2015 HIGH PRESSURE WILL BUILD INTO THE REGION TODAY. THE HIGH WILL SHIFT OFFSHORE ON WEDNESDAY AS A BROAD UPPER LEVEL RIDGE BUILDS OVER NEW ENGLAND.
650 AM EST TUE NOV 24 2015 WITH HIGH PRESSURE IN CONTROL. LOOKS LIKE OUR COLDEST VALLEYS ARE GOING TO END UP RIGHT AT 20 DEGREES THIS MORNING WHILE RIDGES ARE HOLDING IN THE MID 30S. HIGH PRESSURE REMAINS ENTRENCHED ACROSS THE REGION. WITH THE HIGH SHIFTING SLIGHTLY EAST. SLIGHTLY BETTER SOUTH WINDS MAY KEEP TEMPERATURES A TOUCH WARMER. BUT STILL BELOW FREEZING FOR MOST OF THE AREA. THE HIGH SLIDES FURTHER EAST WITH SOUTHEAST WINDS STRENGTHENING. THIS SHOULD SEND HIGHS EVEN HIGHER INTO THE LOWER 60S UNDER MOSTLY SUNNY SKIES. BROAD EAST COAST RIDGING WILL GENERALLY HOLD THROUGH THANKSGIVING DAY BEFORE RIPPLES OF ENERGY.
943 AM EST TUE NOV 24 2015 A DEEP UPPER TROUGH WILL KEEP DRY CONDITIONS AND BELOW NORMAL TEMPERATURES OVER THE AREA TODAY. THE TROUGH WILL MOVE EAST OF THE AREA THROUGH MID WEEK. WITH HIGH PRESSURE MAINTAINING DRY WEATHER AND MODERATING TEMPERATURES.
THE LOWER TREASURE VALLEY WILL PROBABLY HAVE LESS THAN ONE INCH.
FORECAST ON TRACK THIS MORNING AS QUIET AND CALM CONDITIONS CONTINUE THANKS TO THE INFLUENCE OF HIGH PRESSURE. CHATTANOOGA AIRPORT, TN 58 36 59 42 / 0 0 0 0 KNOXVILLE MCGHEE TYSON AIRPORT, TN 56 32 58 39 / 0 0 0 0 OAK RIDGE, TN 56 33 57 38 / 0 0 0 0 TRI CITIES AIRPORT, TN 53 29 57 34 / 0 0 0 0.
532 AM EST TUE NOV 24 2015 HIGH PRESSURE BUILDING BACK IN TODAY.
THE THREAT FOR FREEZING DRIZZLE LATE TONIGHT THROUGH WEDNESDAY MORNING IS THE MAIN FORECAST CHALLENGE. NAM BUFFER SOUNDINGS SUGGEST A WEAK DRIZZLE/FREEZING DRIZZLE EVENT DEVELOPING BY 6Z WEDNESDAY. EVEN A FEW CAM SOLUTIONS ARE NOW PICKING UP ON THE IDEA OF A LIGHT FREEZING DRIZZLE FOR THE HIGHER ELEVATION AREA OF THE PRAIRIE COTEAU. WILL MENTION FREEZING DRIZZLE ALONG THE ND/SD BORDER AND THE PRAIRIE COTEAU. A COLD FRONT WILL PUSH THROUGH THE CWA ON WEDNESDAY WITH ONLY A NOTICEABLE SHIFT IN THE WINDS EXPECTED FOR MOST AREAS.
THE LOW LEVELS WILL GRADUALLY MOISTEN THROUGH WEDNESDAY. WITH HIGHS TODAY IN THE MID 60S TO LOW 70S AND ON WEDNESDAY IN THE LOW TO MID 70S.