Aikyam-Lab/Synoptic-Bench huggingface dataset:
The clouds were clearing from the east and west as the low November sun angle struggles to mix out the moisture in the lower atmosphere. High pressure is expected to control the weather through mid week.
350 PM EST MON NOV 2 2015 HIGH PRESSURE IS BUILDING INTO THE REGION TODAY AND WILL KEEP DRY WEATHER THROUGH MOST OF THE EARLY WEEK.
333 PM CST MON NOV 2 2015 UPPER LEVEL HIGH PRESSURE WILL BUILD EAST OF THE REGION TONIGHT WHILE A TROUGH DEEPENS ACROSS THE WESTERN UNITED STATES. TUESDAY WILL BE MOSTLY SUNNY AND SLIGHTLY WARMER THAN TODAY WITH HIGHS MAINLY IN THE UPPER 70S TO AROUND 80.
SHOWERS AND ISOLATED THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EARLY EVENING AS THE COLD CORE OF THE UPPER LOW PASSES OVER THE BAY AREA. SKIES HAVE CLEARED IN THE NORTH BAY SETTING THE STAGE FOR SOME AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS AS THE COLD CORE OF THE UPPER LOW PASSES OVERHEAD. CURRENT SATELLITE IMAGERY IS IMPRESSIVE SHOWING THE MOISTURE PLUME AND SURFACE BOUNDARY OVER THE CWA WITH THE COLD UPPER LOW DROPPING RIGHT DOWN THE COAST. GENERAL IDEA FROM THE GFS/ECMWF IS A WEAK UPPER TROUGH OVER THE REGION INTO THE WEEKEND KEEPING TEMPS NEAR NORMAL BUT NOT EXPECTING RAIN AT THIS TIME. KSFO BRIDGE APPROACH. A COLD FRONT WILL CONTINUE TO MOVE THROUGH THE REGION TODAY BRINGING PERIODS OF RAIN.
1257 PM EST MON NOV 2 2015 HIGH PRESSURE WILL TAKE CONTROL OF OUR WEATHER THROUGH MID-WEEK WITH FAIR SKIES AND INCREASINGLY MILD AIR.
12 AN AREA OF LOW PRESSURE OVER SOUTHERN ALABAMA WILL SLOWLY WEAKEN AS IT MOVES TO THE NE.
THIS EVENING THROUGH TUESDAY NIGHT THE UPPER LEVEL TROUGH WILL CONTINUE TO DEEPEN OVER THE WESTERN CONUS TONIGHT WITH FLOW UPPER BECOMING SOUTHWESTERLY OVER THE CWA. LOW PRESSURE DEVELOPS OVER NV WITH FRONTAL BOUNDARY BECOMING MORE WELL DEFINED.
ISSUED 354 AM MDT MON NOV 2 2015 UPPER LEVEL TROUGH CURRENTLY MOVING INLAND IN THE NW U. CONTINUING AT LEAST ACROSS EASTERN PORTIONS OF THE FORECAST AREA THROUGH TUESDAY NIGHT AS MOISTURE WRAPS AROUND THE LOW MOVING THROUGH EASTERN MT. LOWER CONFIDENCE STILL EXISTS WITH LOWER ELEVATION SNOWFALL ACCUMULATION FORECASTS AS TEMPERATURES AND SNOW LEVELS WILL BE SOMEWHAT MARGINAL INITIALLY WITH WARMER GROUND TEMPERATURES ALSO LIKELY LIMITING ACCUMULATION ON ROADWAYS THROUGH TUESDAY AFTERNOON.
THE NORTHERN HALF OF AN UPPER LEVEL TROUGH WILL MOVE THROUGH THE PACIFIC NORTHWEST TODAY AND TUESDAY.
HIGH PRESSURE MIDWEEK WITH LINGERING LOW LEVEL MOISTURE.
It will bring the first significant snow event of the season to the High Sierra with widespread rain elsewhere. Chain controls are in effect east of Kingvale on I80, from Twin Bridges east on Highway 50.
241 PM EST MON NOV 2 2015 AN ANOMALOUS UPPER LVL RIDGE WILL BUILD ACROSS THE EASTERN CONUS THIS WEEK.
1254 PM EST MON NOV 2 2015 AN ANOMALOUS UPPER LVL RIDGE WILL BUILD ACROSS THE EASTERN CONUS THIS WEEK.
WE HAVE OPTED TO UPGRADE THE HIGH WIND WATCH FOR ARLINGTON TO A HIGH WIND WARNING AS MODELS SHOW SOME 40 KNOTS OF WIND AT 700 MB ALONG WITH SOME DOWNWARD VERTICAL MOTION ON THE 700-500 MB LAYER TO AID IN BRINGING THE STRONGER WINDS TO THE SURFACE.
AN UPPER LEVEL TROUGH WILL BE PASSING OVER THE AREA TODAY AND OVERNIGHT. THE TROUGH WILL CONTINUE TO BRING COOL AIR INTO THE REGION. CLEARING SKIES OVERNIGHT COULD BRING FREEZING TEMPERATURES TO THE COLUMBIA BASIN.
1232 PM EST MON NOV 2 2015 HIGH PRESSURE WILL BUILD INTO THE REGION TODAY AND CREST OVERHEAD TONIGHT.
A LIGHT SE SURFACE FLOW WILL RETURN LATER TONIGHT THROUGH SUNRISE TUESDAY WHICH WILL ALLOW THE LOW LEVEL DEWPOINTS TO START REBOUNDING SOME.
THIS WILL EFFECTIVELY ORGANIZE A WARM FRONTAL BOUNDARY NORTH OF LAKE HURON OVER ONTARIO PROVINCE.
1123 AM EST MON NOV 2 2015 LOW PRESSURE LIFTING NORTHEASTWARD WILL WEAKEN IN GEORGIA THROUGH TONIGHT.
A RIDGE WAS LOCATED OFF THE SOUTHEAST US COAST WHILE ANOTHER RIDGE EXTENDED FROM NORTHERN MEXICO INTO THE SOUTHERN PLAINS. AN AREA OF LOW PRESSURE WAS MOVING ACROSS THE DEEP SOUTH. THE PATTERN SHOULD CONTINUE TO AMPLIFY AS A TROUGH WORKS ACROSS THE WESTERN CONUS AND A RIDGE BUILDS ACROSS THE EASTERN CONUS. FOG SHOULD DEVELOP AS WINDS SLACKEN WITH HIGH PRESSURE DOMINATING AT THE SFC. TEMPERATURES WILL BE WARMER TOMORROW. REACHING THE 70S AREAWIDE WITH RIDGING DOMINATING. AND HIGH PRESSURE SHOULD BRING ANOTHER NIGHT OF LIGHT WINDS. AS A RIDGE OF HIGH PRESSURE BUILDS ACROSS THE OHIO AND TENNESSEE VALLEY REGIONS.
241 PM CST MON NOV 2 2015 High pressure ridge sliding off to the southeast this afternoon, but flow across the state is mainly out of the south/southwest. With the persistence of the higher dewpoints, the development of fog tonight is quicker, and the stratus is further north and lower.
1149 AM CST MON NOV 2 2015 UPPER LOW OVER TEXAS. RIDGING SPANS THE OHIO VALLEY AND WEAK LOW PRESSURE RESIDES OVER THE NORTHERN PLAINS. AND STARTING OUT A FEW DEGREES WARMER. SHOULD EASILY CLIMB 3-4 DEGREES WARMER THAN YESTERDAY.
TEMPERATURES ARE EXPECTED TO BE A LITTLE COOLER ON TUESDAY.
A BROAD AREA OF LOW PRESSURE CONTINUES OVER MOST OF AL AND WESTERN GA AT MID AFTERNOON WITH A WARM FRONT OVER CENTRAL GA AND AN INVERTED TROUGH OVER EASTERN TN. LOW LEVEL MOISTURE WILL REMAIN TRAPPED ACROSS THE REGION AND THE WEAK INVERTED TROUGH WILL ONLY SLOWLY LIFT NORTH AWAY FROM THE FORECAST AREA BY TUESDAY MORNING AND AFTERNOON. HIGHER PRESSURE WILL BEGIN TO BUILD INTO THE EASTERN TN VALLEY TUESDAY BUT THE COLD FRONT WILL BECOME NEARLY STATIONARY NEAR SOUTH GEORGIA WITH ANOTHER LOW PRESSURE AREA MOVING ALONG THE FRONT. AN UPPER-LEVEL RIDGE WILL REMAIN IN PLACE ACROSS THE SOUTHERN APPALACHIANS DURING THE MIDDLE TO END OF THE WORK WEEK.
HIGH PRESSURE WILL BE IN CONTROL ACROSS THE AREA FOR THE MAJORITY OF THE FORECAST PERIOD.
1228 PM EST MON NOV 2 2015 HIGH PRESSURE OVER THE OHIO VALLEY WILL MOVE SLOWLY TO THE EAST COAST AND A WARM SOUTH TO SOUTHWEST FLOW WILL CONTINUE MUCH OF THE WEEK.
WARM AIR ADVECTION AHEAD OF THE 500MB TROUGH AND SURFACE FRONT KEEPING MID LEVEL TEMPERATURES AT -5 TO -6 DEGREES CELSIUS FOR TONIGHT AND TUESDAY. LOWS TUESDAY MORNING GENERALLY IN THE LOW AND MID 70S EXCEPT FOR THE UPPER 60S/AROUND 70 IN THE COOLER LOCATIONS WEST OF INTERSTATE 95 FROM INDIAN RIVER AND SAINT LUCIE COUNTIES WEST ACROSS OSCEOLA AND OKEECHOBEE COUNTIES TO THE KISSIMMEE RIVER. HIGH PRESSURE RIDGE ALOFT WILL REMAIN OVER THE SOUTHEAST U. AND THE GULF OF MEXICO THROUGH FRI THEN FLATTEN/WEAKEN THIS WEEKEND AS PROGRESSIVE UPPER TROUGH MOVES INTO THE EASTERN CONUS. IN THE LOW LEVELS.
1254 PM EST MON NOV 2 2015 HIGH PRESSURE WILL MOVE INTO THE REGION TODAY BRINGING DRY WEATHER ALONG WITH SOME CLOUDS AND HIGH TEMPERATURES IN THE 50S.
THERE ARE A FEW HOLES IN THE LOW CLOUD DECKS. /ISSUED 210 AM CST MON NOV 2 2015/ UPPER-LOW/TROUGH CONTINUES TO WEAKEN AND MIGRATE EAST ACROSS THE REGION.
WHILE A LARGE TROUGH DIGS ACROSS THE WESTERN UNITED STATES. THE SHORT TERM MODELS STILL FOCUS THE HIGHER PRECIPITATION CHANCES IN THE WEST.
AN INVERTED TROUGH OF LOW PRESSURE OVER EASTERN TN CONTINUES TODAY WITH LIGHT RAIN. THE LOW LEVELS OF THE ATMOSPHERE WILL STAY QUITE MOIST.
111 PM EST MON NOV 2 2015 A LARGE RIDGE OF HIGH PRESSURE WILL BUILD ACROSS THE EASTERN HALF OF THE COUNTRY THIS WEEK.
LOW PRESSURE OVER THE FL PANHANDLE SEEMS TO BE MOVING SLOWER THAN FORECAST TO THE NE TOWARD THE CAROLINAS. TEMPERATURES LATE THIS MORNING WERE ALREADY IN THE LOWER TO MID 60S AT 1000 AM SO HIGHS IN THE MID TO UPPER 60S LOOKED REASONABLE WITH CONTINUED CLOUDS AND RAIN.
1158 AM EST MON NOV 2 2015 HIGH PRESSURE WILL EXTEND ACROSS THE REGION THROUGH THE MIDDLE OF THE WEEK.
300 PM EST MON NOV 2 2015 HIGH PRESSURE WILL TAKE CONTROL OF OUR WEATHER THROUGH MID-WEEK WITH FAIR SKIES AND INCREASINGLY MILD AIR.
With the low stratus deck, temperatures have not warmed as much as they would have otherwise. (Tuesday through Monday) Issued at 0245 PM CST MON NOV 02 2015 As high pressure continues to push east, warm/moist air will filter back into the region ahead of our next weather maker later this week.
EXPECT ANOTHER SUNNY DAY WITH HIGHS IN THE LOWER TO MID 70S TUESDAY.
1236 PM EST MON NOV 2 2015 HIGH PRESSURE WILL MOVE INTO THE REGION TODAY BRINGING DRY WEATHER ALONG WITH SOME CLOUDS AND HIGH TEMPERATURES IN THE 50S.
215 PM MST MON NOV 2 2015 A STRONG PACIFIC LOW PRESSURE SYSTEM WILL BRING MUCH COOLER TEMPERATURES TO THE ENTIRE REGION TOMORROW.
AN UPPER LEVEL TROUGH WILL BE PASSING OVER THE AREA TODAY AND OVERNIGHT. THE TROUGH WILL CONTINUE TO BRING COOL AIR INTO THE REGION. CLEARING SKIES OVERNIGHT COULD BRING FREEZING TEMPERATURES TO THE COLUMBIA BASIN. AN UPPER LEVEL TROUGH WILL KEEP UNSETTLED WEATHER NEAR TAFS SITES FOR 15-18 HOURS.
MAIN FOCUS IS ON PRECIPITATION TYPE ASSOCIATED WITH A STALLED COLD FRONTAL BOUNDARY ALONG THE NEVADA BORDER TUESDAY MORNING. MODEL GUIDANCE REMAINS IN GOOD AGREEMENT WITH A BRIEF BREAK IN THE PRECIPITATION THIS EVENING FOLLOWED MODERATE PRECIPITATION BAND WITH THE PASSAGE OF THE LOW CENTER /CURRENTLY OFF THE NORTHERN CALIFORNIA COAST/ LATE TUESDAY MORNING. COLD FRONT THAT MOVED THROUGH THE AREA YESTERDAY IS NOW STALLED OUT IN THE SOUTHERN THIRD OF THE CWA. TROUGH AXIS IS NOW JUST OFF THE PACIFIC COAST AND IS MOVING INLAND. BY TUESDAY MIDDAY THE TROUGH AXIS IS EXPECTED TO BE SHIFTING TO THE EASTERN THIRD OF THE CWA.
HIGH PRESSURE RIDGING ACROSS THE AREA WILL SHIFT TO THE SOUTHEAST AS A WEAKENING LOW PRESSURE SYSTEM LIFTS OUT TO THE NORTHEAST ACROSS THE DEEP SOUTH TONIGHT AND SETTLES A FRONTAL BOUNDARY INTO NORTHERN FLORIDA BEFORE STALLING IT THROUGH TUESDAY. WITH THE HIGHER CHANCES IN THE NORTH NEAR THE BOUNDARY. TEMPERATURES ARE EXPECTED TO FALL INTO THE LOWER TO MID 70S TONIGHT AND WARM BACK INTO THE MID 80S TO NEAR 90. STRONG UPPER/MID LEVEL RIDGING WILL BE POSITIONED ACROSS MUCH OF THE EASTERN AND CENTRAL CONUS INCLUDING FLORIDA TUESDAY NIGHT. RIDGING WILL REMAIN IN CONTROL ALOFT. ALLOWING THE SURFACE SUBTROPICAL RIDGE TO STRENGTHEN TO THE NORTH OF FLORIDA.
HIGH PRESSURE MIDWEEK WITH LINGERING LOW LEVEL MOISTURE IN SOUTH.
303 PM EST MON NOV 2 2015 HIGH PRESSURE WILL MAINTAIN CONTROL OF OUR WEATHER THROUGH MID- WEEK WITH FAIR SKIES AND INCREASINGLY MILD AIR.
106 PM EST MON NOV 2 2015 LOW PRESSURE LIFTING NORTHEASTWARD WILL WEAKEN IN GEORGIA THROUGH TONIGHT.
234 PM EST MON NOV 2 2015 LOW PRESSURE LIFTING NORTHEASTWARD WILL WEAKEN IN GEORGIA THROUGH TONIGHT.
1139 AM EST MON NOV 2 2015 AN ANOMALOUS UPPER LVL RIDGE WILL BUILD ACROSS THE EASTERN CONUS THIS WEEK.
228 PM EST MON NOV 2 2015 LOW PRESSURE WILL TRACK TO THE SOUTH TODAY.
1133 AM MST MON NOV 2 2015 GRIDDED FORECAST UPDATE FOR THIS AFTERNOON AS MORE SUNSHINE HAS LED TO WARMER TEMPERATURES. INITIAL PEEK AT THE HIGH WIND WATCH FOR ARLINGTON FOR TONIGHT AND EARLY TUESDAY MORNING LOOKS LIKE A SPOT ON CALL BY OUR MIDNIGHT FORECAST TEAM.
211 PM EST MON NOV 2 2015 HIGH PRESSURE OVER THE OHIO VALLEY WILL MOVE SLOWLY TO THE EAST COAST AND A WARM SOUTH TO SOUTHWEST FLOW WILL CONTINUE MUCH OF THE WEEK.
122 PM EST MON NOV 2 2015 A LARGE RIDGE OF HIGH PRESSURE WILL BUILD ACROSS THE EASTERN HALF OF THE COUNTRY THIS WEEK.
352 PM CST MON NOV 2 2015 WESTERN HIGH PLAINS LOW PRESSURE WILL CONTINUE TO ORGANIZE TONIGHT AS ENERGY CROSSES THE ROCKIES. PRIMARY INFLUENCE TO IOWA WILL BE THE WARM FRONT THAT HAS LINGERED OVER NORTHERN IOWA. THIS WILL KEEP THE STATE MILD OVERNIGHT AND WILL BRING WARMER LOWS TO THE NORTH TONIGHT WHERE READINGS DIPPED INTO THE 30S AGAIN THIS MORNING. MUCH OF THIS STRATUS HAS DISSIPATED WITH DAYTIME HEATING HOWEVER THE LOW LEVEL MOISTURE REMAINS. THIS WILL ALLOW THE LOW LEVEL MOISTURE TO STREAM NORTH OVERNIGHT AND SHOULD REACH SOUTHERN IOWA BY 12Z TUESDAY. LOCALIZED FOG WILL BE POSSIBLE AS THE LOW LEVEL MOISTURE ARRIVES.
257 PM EST MON NOV 2 2015 A LARGE RIDGE OF HIGH PRESSURE WILL BUILD ACROSS THE EASTERN HALF OF THE COUNTRY THIS WEEK.
TEMPERATURES HAVE CLIMBED ABOVE FREEZING THIS MORNING. SO UPDATED THE FORECAST TO REMOVE THE MENTION OF FREEZING RAIN IN THE JAMESTOWN AND CARRINGTON AREAS. GIVEN SUB FREEZING TEMPERATURES AS OF 12 UTC IN THE JAMESTOWN AND CARRINGTON AREAS. ADDED A MENTION OF FREEZING RAIN THROUGH 14 UTC WITH THIS UPDATE. MOSTLY CLOUDY ALONG THE TROUGH AXIS WITH THE SKY TRENDING CLEAR TO SCATTERED IN ITS WAKE ACROSS EASTERN MONTANA. FLOW ALOFT TRANSITIONS FROM ZONAL TO MORE SOUTHWESTERLY TONIGHT AS A HIGH AMPLITUDE UPPER LEVEL TROUGH MOVES INTO THE WESTERN CONUS.
255 PM EST MON NOV 2 2015 HIGH PRESSURE WILL CREST OVERHEAD TONIGHT.
311 PM EST MON NOV 2 2015 HIGH PRESSURE WILL CREST OVER THE REGION THIS EVENING THEN MOVE EAST LATE TONIGHT.
WITH THE BULK OF THE LOWEST CIGS OVER THE ERN HALF OF THE REGION.
1131 AM EST MON NOV 2 2015 HIGH PRESSURE OVER THE OHIO VALLEY WILL MOVE SLOWLY TO THE EAST COAST AND A WARM SOUTH TO SOUTHWEST FLOW WILL CONTINUE MUCH OF THE WEEK.
256 PM CST MON NOV 2 2015 CLOUDS ARE ON THE DECREASE ACROSS THE FORECAST AREA THIS AFTERNOON WITH TEMPERATURES RANGING FROM THE LOWER 60S TO MID 70S. HIGH PRESSURE WILL BE IN CONTROL OF THE WEATHER OVER MUCH OF THE EASTERN U. THIS WILL MEAN DRY WEATHER AND WARMER TEMPERATURES FOR THE FORECAST AREA WITH HIGHS ON TUESDAY IN THE MID TO UPPER 70S.
A DEEP AND WELL STACKED ANTICYCLONE REMAINS ACROSS THE EXTREME WESTERN ATLANTIC. ASIDE FROM THE DEFORMATION OF THE MID AND UPPER LEVELS BY A WESTERN MOVING TROUGH NEAR EASTERN CUBA. CORRESPONDING TO THE GRADIENT BETWEEN THE ANTICYCLONE TO OUR NORTHEAST AND THE UPPER TROUGH TO OUR SOUTHEAST.
405 PM EST MON NOV 2 2015 HIGH PRESSURE WILL REMAIN OVER THE REGION THROUGH MID WEEK.
ANY STRATUS THAT DEVELOPS WITHIN A POCKET OF HIGH RH IN THE LOW LEVELS SHOULD BE TO OUR NORTH OVER CENTRAL/NORTHERN WI AND TO OUR SOUTH OVER CENTRAL TO POSSIBLY NORTHERN IL.
DAMPENING UPPER LOW IS MOVING NORTHEAST OVER THE REGION AT PRESENT.
1254 PM EST MON NOV 2 2015 HIGH PRESSURE WILL BRIEFLY BUILD ACROSS THE REGION TODAY.
AS THE COOLER AIR DEEPENS IN THE BACK DOOR. THE WARMER TEMPS WILL FILTER BACK INTO MIDWEEK WITH PARTLY CLOUDY CONDITIONS DURING THIS TIMEFRAME.
SHOWERS AND ISOLATED THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EARLY EVENING AS THE COLD CORE OF THE UPPER LOW PASSES OVER THE BAY AREA. SKIES HAVE CLEARED IN THE NORTH BAY SETTING THE STAGE FOR SOME AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS AS THE COLD CORE OF THE UPPER LOW PASSES OVERHEAD. CURRENT SATELLITE IMAGERY IS IMPRESSIVE SHOWING THE MOISTURE PLUME AND SURFACE BOUNDARY OVER THE CWA WITH THE COLD UPPER LOW DROPPING RIGHT DOWN THE COAST. GENERAL IDEA FROM THE GFS/ECMWF IS A WEAK UPPER TROUGH OVER THE REGION INTO THE WEEKEND KEEPING TEMPS NEAR NORMAL BUT NOT EXPECTING RAIN AT THIS TIME. A SHARP AND COLD UPPER TROUGH LOCATED APPROX 300 MILES WEST OF THE BAY AREA WILL MOVE E-SE OVER THE AREA TODAY. KSFO BRIDGE APPROACH. A COLD FRONT WILL CONTINUE TO MOVE THROUGH THE REGION TODAY BRINGING PERIODS OF RAIN.
1240 PM EST MON NOV 2 2015 A MID TO UPPER LEVEL TROUGH CROSSES MONDAY EVENING. HIGH PRESSURE MIDWEEK WITH LINGERING LOW LEVEL MOISTURE IN SOUTH.
A trough currently seen on satellite along the west coast, will deepen and move east over the next few days causing upper flow to increase and become more southwesterly.
337 PM CST MON NOV 2 2015 THE SYNOPTIC PATTERN IS DOMINATED BY SOUTHWEST FLOW ACROSS THE WESTERN CONUS AHEAD OF A DIGGING LONGWAVE TROUGH BEGINNING TO COME ONSHORE. LEE TROUGHING HAS DEVELOPED ACROSS THE HIGH PLAINS BEGINNING BRINGING SOUTHERLY WINDS BACK TO CENTRAL AND SOUTHEAST KANSAS.
AS AN UPPER TROUGH REMAINS OVER THE AREA WITH MOIST NORTHERLY FLOW IN PLACE, LIGHT SHOWERS WILL CONTINUE ACROSS AREA. HOWEVER AS THE TROUGH MOVES INLAND FURTHER, THE FRONT WILL SHIFT TO THE EAST DURING THE DAY WITH SHOWERS BECOMING SCATTERED IN THE MODC AREA. LIGHT SHOWERS WILL CONTINUE INTO TUESDAY WITH THE UPPER TROUGH GRADUALLY SHIFTING EAST AND A WEAK DISTURBANCES MOVING DOWN FROM THE NORTH ON THE BACKSIDE OF THE TROUGH TUESDAY.
UPPER AIR ANALYSIS THIS MORNING SHOWED A TROUGH OVER THE SOUTHERN MISSISSIPPI VALLEY WITH A WEAK RIDGE BUILDING OVER WEST TEXAS. THERE WAS ANOTHER TROUGH APPROACHING THE WEST COAST. HIGH PRESSURE HAS SETTLED OVER THE AREA. THE UPPER TROUGH ALONG THE WEST COAST WILL DIG TO THE SOUTH AND EAST TURNING THE UPPER LEVEL FLOW OVER TEXAS TO THE SOUTHWEST.
THE MAIN DRIVER FOR THE WEATHER TONIGHT WILL TRANSITION TO A PLANETARY SCALE RIDGING EPISODE. IMPRESSIVE DIGGING UPPER LEVEL TROUGH ALONG THE WEST COAST OF NORTH AMERICA TODAY. WHICH WILL ALLOW AN UNSEASONABLY STRONG UPPER LEVEL RIDGE TO CONTINUE TO BUILD OVER THE CENTRAL CONUS.
540 AM CST THU DEC 17 2015 Cold front has passed well east of Illinois early this morning: however, a large area of low clouds behind the boundary is currently filtering into the area from the northwest.
This precipitation is occuring with isentropic lift component ahead of an upper disturbance and surface cold front. Any additional rainfall totals should range between a tenth and a third of an inch, with the higher totals along the I-75 corridor. Deep moisture gets shut off with the passage of the upper disturbance and cold front, which will lead to a dry and partly cloudy day. Eastern CONUS trough axis slides toward the Ohio River Valley tonight, with continued cold advection helping temperatures quickly drop into the upper 20s to around 30. May include some spinkle mention in areas where surface temps get just above freezing as we head into the day on Friday.
535 AM CST THU DEC 17 2015 LIGHT SURFACE WINDS WILL PICK UP OUT OF THE SOUTH AT 5 TO 10 KT LATER THIS MORNING AHEAD OF OUR NEXT COLD FRONT. THOUGH LIFT FROM THE UPPER TROUGH MAY BE ENOUGH TO SQUEEZE OUT A SPRINKLE OR TWO. AFTERNOON HIGHS WILL RANGE FROM THE MIDDLE 50S TO THE LOWER 60S. A COLD FRONT WILL ENTER THE WESTERN ZONES THIS AFTERNOON AND SPREAD ACROSS THE ENTIRE REGION THIS EVENING. A FEW SPRINKLES MAY DEVELOP ACROSS THE RED RIVER AS AN UPPER TROUGH TRANSLATES EAST ACROSS THE CENTRAL/SOUTHERN PLAINS. BUT MOISTURE WILL BE LIMITED IN THE LOWER ATMOSPHERE SO MEASURABLE PRECIPITATION IS UNLIKELY. UPPER LEVEL HIGH PRESSURE WILL BUILD EAST ACROSS THE CENTRAL U.
BROAD UPPER TROF OVERHEAD WITH A PAIR OF WEAK EMBEDDED WAVES PIVOTING AROUND A CENTRAL LOW WILL RESULT IN PERIODS OF OFF AND ON CLOUD COVER ALONG WITH ENOUGH MOISTURE IN THE DENDRITIC GROWTH ZONE FOR SOME LIGHT SNOW SHOWERS/FLURRIES.
641 AM CST THU DEC 17 2015 SLIGHTLY ADJUSTED AREA OF SNOW SHOWER/FLURRY MENTION THIS MORNING BACK INTO DEVILS LAKE BASIN AS A WEAK UPPER WAVE DROPS SOUTHWARD ON THE BACK SIDE OF THE PRIMARY UPPER TROUGH. CYCLONIC FLOW ALOFT WILL CONTINUE THROUGH FRIDAY WITH BROAD TROUGHING OVER THE NORTHERN PLAINS/UPPER MIDWEST. THE UPPER LOW ASSOCIATED WITH THE SNOWFALL YESTERDAY CONTINUES TO LIFT SLOWLY NORTHWARD INTO ONTARIO THIS MORNING. ANOTHER UPPER LOW OVER NORTHERN SASKATCHEWAN WILL ROTATE SOUTHWARD THROUGH THE BROADER TROUGH TODAY THROUGH FRIDAY BRINGING A LOBE OF COLDER AIR (-18 TO -19C AT 850 MB) SOUTHWARD. WITH THE HIGHEST CHANCES OVER NW MN. WITH MODEL RH SHOWING SOME DRYING IN THE LOWER LEVELS. GIVEN THE ABUNDANCE OF UPSTREAM CLOUDINESS AND INFLUENCE OF THE UPPER TROUGH.
Cold air advection actually began last evening across much of the area in the wake of a cold Front, which is now to our east. However, there is decent low level moisture confined to the lowest 3000 ft of the atmosphere that could yield some flurries late tonight into early Friday morning. However, decided to put some flurries in the EVV tri state region which is where the highest low level moisture will be situated and probably the best Location for some flurries, at least at this time. Since the center of high pressure will pass to our south, there should be some west to southwest flow off the surface.
521 AM CST THU DEC 17 2015 COOLER AND DRIER AIR CONTINUES TO FILTER INTO THE REGION IN THE WAKE OF THE CDFNT THAT CROSSED THE AREA ON WED. WITH LOWS SAT AM NEARING THE FREEZING MARK OVER INTERIOR SE TX AND CENTRAL LA.
SNOW LEVELS STILL EXPECTED TO RISE THIS AFTERNOON AS THE WARM FRONT PUSHES IN. /ISSUED 230 AM PST THU DEC 17 2015/ A WARM FRONT MOVES THROUGH THE REGION THIS MORNING WITH LIGHT SNOW NEAR THE OREGON BORDER ALONG WITH A SLIGHT CHANCE OF FREEZING RAIN.
Temperatures will struggle to warm today with highs in the lower to upper 30s. Friday through next Thursday, a longer wave-length trough will remain across the western conus through the forecast period.
AFTER THE HIGH MOISTURE SOUNDING AT 0Z PW IS STARTING TO COME DOWN A BIT DUE TO DRIER AIR AT MID LEVELS AND IS AT 1. /ISSUED 400 AM CST THU DEC 17 2015/ COLD FRONT CURRENTLY MOVING THROUGH THE AREA LOCATED OVER HANCOCK COUNTY DOWN THROUGH NEW ORLEANS.
AND FRIDAY CLOUDY AND BREEZY CONDITIONS WILL CONTINUE ACROSS NORTHEAST WISCONSIN IN THE WAKE OF A DEPARTING LOW PRESSURE SYSTEM TODAY THROUGH FRIDAY.
1025 AM EST THU DEC 17 2015 WIDESPREAD RAIN AHEAD OF COLD FRONT THIS MORNING. COLD FRONT MOVES THROUGH TODAY FROM WEST TO EAST.
A COLD FRONT IS FORECAST TO DROP SOUTH ACROSS THE PLAINS THIS AFTERNOON. HIGH PRESSURE WILL MOVE INTO THE INTERMOUNTAIN WEST WITH BROAD NORTHWESTERLY FLOW CONTINUING ACROSS COLORADO.
MODEL QPF SIGNALS STILL INDICATE THIS AREA EXPANDING SOUTHEAST WITH SOME LIGHT SNOW OR LIGHT RAIN DEPENDING ON THE LOW LEVEL THERMODYNAMICS.
Lows heading into Friday morning will be mainly in the teens as high pressure builds in and the sky clears.
952 AM EST THU DEC 17 2015 WESTERLY WINDS WILL BE FOUND OVER THE REGION TODAY BEHIND A DEPARTING COLD FRONT. A SECONDARY COLD FRONT WILL CROSS THE REGION FRIDAY AFTERNOON AND EVENING WITH A LARGE UPPER LEVEL TROUGH.
ALOFT: THE LONGWAVE TROF THAT WAS OVER THE WRN USA THE PAST 5 DAYS WAS SHIFTING E IN RESPONSE TO THE STORM OVER THE GULF OF AK. THIS TROF WILL MOVE THRU THIS EVE WITH NW FLOW AND RISING HEIGHTS IN ITS WAKE. THIS LOW WILL FILL AND DISSIPATE TODAY AS IT CONTS SE INTO THE SRN PLAINS. THE HIGH WILL TRANSLATE SE IN ITS WAKE AND EMERGING INTO THE SRN PLAINS BY DAYBREAK FRI. BUT THAT WILL ONLY REVEAL MULTI-LAYERED MID-HIGH CLOUDS ASSOCIATED WITH THE APPROACHING TROF. SOME OF THIS COULD BRUSH THE WRN FRINGE OF THE FCST AREA FROM LEXINGTON- CAMBRIDGE-PLAINVILLE KS AS SOME FLURRIES.
1040 AM EST THU DEC 17 2015 THE COLD FRONT OVER ALABAMA WILL CONTINUE TO PUSH EASTWARD. /ISSUED 322 AM EST THU DEC 17 2015/ WIDESPREAD SHOWERS CONTINUE ACROSS THE STATE THIS MORNING AS MOISTURE SURGES INTO THE REGION AHEAD OF A COLD FRONT. COOL HIGH PRESSURE BUILDS BACK INTO THE REGION FOR THE REMAINDER OF THE SHORT TERM.
SHOWER ACTIVITY LOOKS TO CONTINUE THIS MORNING AS THE UPPER TROUGH CONTINUES EASTWARD ALONG WITH THE COLD FRONT JUST AHEAD OF THE TROUGH AXIS. THE COLD FRONT WILL BRING COOLER TEMPERATURES TO THE REGION STARTING TODAY AND CONTINUING THROUGH THE WEEKEND. COOLER IS A RELATIVE TERM HOWEVER SINCE TEMPERATURES WILL COOL DOWN TO AROUND SEASONAL AVERAGES FOR MID DECEMBER. THE MAIN TROUGH AXIS SLIDES IN BY FRIDAY MORNING SO NOT LOOKING FOR MUCH ABSENCE OF CLOUD COVER OUT EAST. WITH THE COOLER TEMPERATURES AND UPSLOPE FLOW.
/ISSUED 521 AM CST THU DEC 17 2015/ COOLER AND DRIER AIR CONTINUES TO FILTER INTO THE REGION IN THE WAKE OF THE CDFNT THAT CROSSED THE AREA ON WED. WITH LOWS SAT AM NEARING THE FREEZING MARK OVER INTERIOR SE TX AND CENTRAL LA.
320 AM PST THU DEC 17 2015 NORTHWEST FLOW ALOFT WILL TRANSITION TO WEAK HIGH PRESSURE ALOFT WITH WARMING TO SLIGHTLY ABOVE AVERAGE FOR FRIDAY.
HIGH PRESSURE WILL BUILD INTO NORTHERN ARIZONA FROM THE WEST BRINGING DRY WEATHER AND A WARMING TREND.
THE SNOW WILL COME AS THE STORM/S WARM FRONT MOVES THROUGH EASTERN OREGON LATE TODAY AND WESTERN IDAHO TONIGHT. TEMPERATURES WILL RISE TO NEAR FREEZING IN THE VALLEYS LATE TODAY AND THEN HOLD STEADY OR SLOWLY RISE THROUGH NIGHT NIGHT.
SUBTLE SHORT WAVE PUSHING THROUGH THE AREA ON BACKSIDE OF UPPER LOW OVER WESTERN ONTARIO IS RESULTING IN SOME LIGHT SNOW SHOWERS DEVELOPING OVER NORTH CENTRAL NORTH DAKOTA AND SLIDING OFF TO THE SOUTHEAST.
SOME SHOWERS WILL BE MOVING INTO THE NATURE COAST TODAY AHEAD OF A COLD FRONT. HIGHS WILL STILL BE WELL ABOVE NORMAL IN THE LOWER TO MID 80S THIS AFTERNOON. THE COLD FRONT WILL MOVE THROUGH IN THE OVERNIGHT HOURS/EARLY FRIDAY MORNING WITH SOME SHOWERS AND AN ISOLATED THUNDERSTORM POSSIBLE AS WELL AS SOME PATCHY FOG CAUSING MVFR TO IFR CONDITIONS AFTER 05Z.