Aikyam-Lab/Synoptic-Bench huggingface dataset:
102 AM EST TUE DEC 15 2015 A COLD FRONT TRAILING GREAT LAKES LOW PRESSURE WILL MOVE EAST TONIGHT. HIGH PRESSURE AND A DRY AIRMASS ARE EXPECTED FOR TUESDAY. ANOTHER COLD FRONT IS FORECAST TO PROVIDE THE POSSIBILITY FOR MORE SHOWERS ON WEDNESDAY. THE SURFACE COLD FRONT IS NOW WELL EAST OF THE ILN FORECAST AREA. BUT CONTINUED COLD ADVECTION AT 925MB IS LEADING TO SOME STEEP LAPSE RATES IN THE LOW-LEVELS. A RIDGE OF HIGH PRESSURE AT THE SURFACE AND ALOFT WILL VISIT THE OHIO VALLEY ON TUESDAY. THOUGH MODELS SHOW CLOUDS LINGERING IN THE RATHER WEAK SUBSIDENCE ASSOCIATED WITH THE HIGH. ANOTHER COLD FRONT WILL ADVANCE TOWARD THE AREA FROM THE WEST. MID AND UPPER 50S MAY OCCUR WEDNESDAY WHEN READINGS WILL BE ENHANCED BY WARM ADVECTION AHEAD OF THE COLD FRONT.
1143 PM CST MON DEC 14 2015 SFC WINDS WILL VEER OVERNIGHT AS A PACIFIC COLD FRONT APPROACHES WITH SPEEDS ABOVE 10KT ON THE CAPROCK. LOWS TONIGHT WILL BE A FEW DEGREES WARMER AS WESTERLY SURFACE WIND REMAINS UP OVERNIGHT OFFSETTING ANY RADIATIONAL COOLING THAT WOULD OCCUR UNDER EXPECTED CLEAR SKIES. COOLER AIR WILL START TO PUSH IN BEHIND A PACIFIC FRONT WHICH COULD LIMIT MIXING AND ALSO KEEP WIND SPEEDS JUST UNDER ADVISORY CRITERIA.
1026 PM MST MON DEC 14 2015 ONGOING PRESSURE FALLS WITH THE APPROACHING UPPER LOW HAS SUPPORTING BACKING LL WINDS WITH WINDS NOW MORE NE ACROSS THE FA. NOSE OF HIGH PRESSURE IS PRESENT ACROSS THE CENTRAL DAKOTAS. WITH LOW PRESSURE OVER THE CENTRAL ROCKIES. UPPER LOW OVER THE CENTRAL GREAT BASIN WILL SLIDE INTO THE CENTRAL ROCKIES. TROUGH BECOMES NEGATIVELY TILTED LATE TONIGHT AS 700MB LOW MOVES OVER NORTHEASTERN CO AND BEGINS TO TRANSITION NORTHEASTWARD THROUGH THE CENTRAL PLAINS. WITH THE HIGHER AMOUNTS ACROSS SOUTH CENTRAL SOUTH DAKOTA.
HIGH PRESSURE WILL GRADUALLY BUILD OVER THE REGION THROUGH THE END OF THE WEEK. AN UPPER LOW SPINNING ALONG THE UT/CO BORDER IS INDUCING A COLD AND MOIST NORTHERLY FLOW ACROSS MUCH OF THE FORECAST AREA THIS EVENING. SNOWFALL SHOULD GRADUALLY WIND DOWN TUESDAY AFTERNOON THROUGH TUESDAY EVENING AS THE UPPER LOW GRADUALLY MOVES EAST.
COOL DRY NORTHWEST FLOW ALOFT WILL SETTLE INTO THE AREA TODAY BEHIND AN EXITING LOW PRESSURE SYSTEM.
252 AM CST TUE DEC 15 2015 LOW LEVEL MOISTURE WILL INCREASE ACROSS THE REGION TODAY AHEAD OF A COLD FRONT. TEMPERATURES TODAY WILL BE MILD ONCE AGAIN WITH HIGHS FROM THE MIDDLE 60S TO THE LOWER 70S. THE COLD FRONT SHOULD STALL NEAR OR JUST EAST OF THE INTERSTATE 35 CORRIDOR THIS AFTERNOON UNTIL A SECONDARY PUSH OF COOL AND DRY AIR ARRIVES OVERNIGHT. AN UPPER LEVEL RIDGE WILL AMPLIFY ACROSS THE WESTERN U.
THERE COULD BE A FEW INCHES ALONG THE HIGHER ELEVATIONS OF THE EASTERN MOUNTAINS WITH SOME SPOTTY LIGHT ACCUMULATIONS ACROSS THE LOWER ELEVATIONS. THIS ALSO SENDS ANOTHER COLD FRONT THROUGH THE PLAINS WEDNESDAY NIGHT/EARLY THURS.
1144 PM CST MON DEC 14 2015 INTENSE LOW PRESSURE SYSTEM THAT BROUGHT RECORD RAINFALL TO IOWA. THE PRESSURE GRADIENT WILL DECREASE OVERNIGHT WITH THE STATE BETWEEN THE DEPARTING LOW PRESSURE TO THE NORTHEAST AND THE NEXT SYSTEM DEVELOPING ON THE LEE SIDE OF THE ROCKIES. BEST FOG POTENTIAL IS ACROSS THE WEST AND SOUTHWEST WHERE THE GRADIENT WEAKENS THE MOST TO NEARLY A DEFAULT RIDGE BETWEEN THE TWO SYSTEMS. ANOTHER LOW PRESSURE SYSTEM WILL BEGIN TO AFFECT THE AREA TUESDAY. AND IF TEMPERATURES ARE NEAR OR BELOW FREEZING. ESPECIALLY TUESDAY NIGHT MAY HAVE CHANCES FOR FREEZING RAIN OR DRIZZLE. FAVORING LATER ONSET TO PRECIPITATION ALLOWING FOR ICE INTRODUCTION IN THE NORTHWEST AND WARMER TEMPERATURES ELSEWHERE. BEHIND SYSTEM TEMPERATURES WILL BE COOLER.
400 AM EST TUE DEC 15 2015 A COLD FRONT WILL MOVE ONTO THE EASTERN SHORE BEFORE SUNRISE. HIGH PRESSURE BUILDS INTO THE MID ATLANTIC TODAY INTO WEDNESDAY.
THE LOW WILL HELP DRAW DEEPER MOISTURE NORTHWARD AND STEEPEN THE PRESSURE GRADIENT. 11 EASTERLY FLOW TODAY WILL VEER TO THE SOUTH AND THEN SOUTHEAST TONIGHT INTO WEDNESDAY AS WEAK HIGH PRESSURE OVER THE CENTRAL AND EASTERN GULF COAST SHIFTS TO THE EAST AND LOW PRESSURE DEVELOPS IN THE CENTRAL PLAINS.
TODAY THROUGH WEDNESDAY NIGHT UPPER TROUGH STRETCHES OVER THE ROCKIES. WITH UPPER LOW OVER CO. WEAK AREA OF HIGH PRESSURE IS CREATING LIGHT NORTHEASTERLY UPSLOPING WINDS. WITH FOG AND PATCHY FREEZING DRIZZLE OVER PARTS OF THE SD PLAINS. FREEZING FOG MAY LINGER INTO THIS MORNING BEFORE THE MAIN SNOW ARRIVAL. FAIRLY STACKED LOW PRESSURE WILL STRENGTHEN TODAY AS IT BEGINS TRACKING NORTHEASTWARD THROUGH THE CENTRAL PLAINS. MOISTURE WILL BEGIN WRAPPING AROUND THE LOW THIS MORNING. A CANADIAN UPPER LOW WILL PUSH SOME WEAK ENERGY AND ADDITIONAL MOISTURE INTO THE REGION.
WHILE WARMER AIR ALOFT AND GOOD MIXING WILL RESULT IN SOME 60S IN SOUTHEAST KS.
/ISSUED 630 PM EST MON DEC 14 2015/ BEHIND TODAYS COLD FRONTAL PASSAGE. LIGHT NW WIND AND COOLER LOWS IN THE 40S STILL ON TAP FOR THE AREA. HIGH PRESSURE AND A DRIER AIRMASS MOVES IN BEHIND THIS SYSTEM AND CLEARS THINGS OUT THROUGH THE REST OF THE SHORT TERM. THERE IS NOT A LOT OF COOLER AIR BEHIND THIS FRONT SO NOT EXPECTING TEMPS TO DIP MUCH LOWER THAN THEY HAVE BEEN OVER THE PAST FEW DAYS.
Tuesday is looking to be a pretty decent day (after morning fog) as weak ridging aloft briefly moves into the region. Another strong upper level trough will push eastward out of the Rockies late Tuesday and into Wednesday. Surface cyclogenesis will evolve from leeside troughing just out ahead of the front range. A cold frontal boundary is expected to quickly move through the area around this time.
LOW PRESSURE ALOFT ACROSS THE WESTERN HALF OF THE NATION WILL STEER COOL AND DRY AIR ACROSS SOUTHERN CALIFORNIA THROUGH TUESDAY. AND WEAK OFFSHORE FLOW WILL ALLOW NIGHTTIME TEMPERATURES TO FALL TO AROUND FREEZING IN WIND SHELTERED AREAS BOTH TUESDAY AND WEDNESDAY MORNINGS.
BRIEF NARROW RIDGING MOVES OVERHEAD BY MID-DAY. TEMPS HAVE COOLED IN THE WAKE OF THE LOW THAT DEPARTED THE AREA YESTERDAY. AN INTENSE UPPER LEVEL LOW OVER THE 4-CORNERS AREA WILL LIFT NORTHEAST TOWARD MINNESOTA LATER TONIGHT INTO WEDNESDAY. WE/LL SEE A DECENT SHOT OF DEEP LAYER WARM AIR ADVECTION/ISENTROPIC LIFT ALONG AND AHEAD OF THE APPROACHING WARM FRONT AHEAD OF THE LOW LATE THIS EVENING AND AFTER MIDNIGHT. THEN ANOTHER ROUND OF DEEP FORCING ARRIVES AFTER MIDNIGHT WITH THE DYNAMICS OF THE UPPER LOW. GIVEN THE TRACK OF THE LOW. LOW LEVEL THERMAL RIDGE AXIS OF 4-6C 925 TEMPS PEAKS BY 18Z WITH COLD ADVECTION WRAPPING IN DURING THE AFTERNOON ON INCREASING SW WINDS.
Satellite trends indicate that the low stratus is oozing southward now reaching KCGI and just north of KPAH. Our region will be under a brief period of ridging between systems tonight and Tuesday. Another vigorous low pressure system will bring a cold front into the region on Wednesday. Though the mid level trof looks formidable, little chc for deep moisture return and weak convergence in the lower levels will likely limit and any precip to very light rain.
Patchy freezing drizzle will also be a potential hazard this morning. Vigorous upper low in southern Colorado this morning, with surface pressures quickly falling in the lee of the Rockies. Dry but vigorous cold front will sweep through western Kansas this afternoon, with winds becoming more westerly with time.
A small chance of light rain maybe possible within the low cloud band.
1153 PM EST MON DEC 14 2015 AVIATION RAIN SHOWERS WILL TAPER OFF AND END TONIGHT WITH COOLER WEATHER ARRIVING FOR TUESDAY. LOW PRESSURE WILL TRACK NORTH OF LOWER MICHIGAN ON WEDNESDAY WITH RAIN AND MILD WEATHER. NARROW LINE OF SHOWERS MARKING THE EDGE OF THE COOLER AIR HAS MOVED OFF TO THE NORTHEAST OF THE FORECAST AREA AND THE UPPER LOW WILL MOVE THROUGH THIS EVENING WITH SCATTERED SHOWERS AND DRIZZLE. BREEZY AND COOLER FOR TUESDAY BUT WARM ADVECTION BEGINS TUESDAY NIGHT AS ANOTHER LOW APPROACHES.
341 AM CST TUE DEC 15 2015 A weak area of high pressure will cross central and southeast Illinois today between two strong areas of low pressure. While the area of high pressure is fairly small/weak, there is a very strong subsidence inversion associated with it per 00Z ILX and forecast soundings. Much of the higher resolution guidance is also pointing in this direction. Assuming the clouds hold, high temperatures should range from the lower 40s northwest to upper 40s southeast across the forecast area. Later tonight, the deep low/trof over the desert SW will move through the Plains and stretch a developing boundary into the Midwest. Although the track of the upper low is similar in all models, the sfc depiction of the boundary is different through tomorrow.
303 AM EST TUE DEC 15 2015 COLD FRONT HAS PUSHED SOUTH AND EAST OF THE CWA AND HIGH PRESSURE HAS MOVED INTO THE REGION. UPPER LEVEL RIDGE AXIS WILL PUSH EASTWARD THROUGH WEDNESDAY. GUIDED BY LONGWAVE TROUGH BEHIND IT.
NEAR TERM AND SHORT TERM SECTIONS HAVE BEEN UPDATED BELOW BRIEF RIDGING OVER THE AREA WILL RESULT IN DRY CONDITIONS TODAY AND TONIGHT. THE NEXT LOW PRESSURE SYSTEM AND ASSOCIATED COLD FRONT ARE PROGGED TO ARRIVE ON WEDNESDAY.
355 AM CST TUE DEC 15 2015 ALL EYES ARE ON THE CLOSED LOW OVER THE CENTRAL ROCKY MOUNTAINS THAT WILL RACE NORTHEAST AND AFFECT THE FORECAST AREA TONIGHT AND WEDNESDAY. ALTHOUGH WARMER AIR OVER MUCH OF CENTRAL/SOUTH CENTRAL MN AND WEST CENTRAL WI WILL LIKELY INHIBIT A FULL TRANSITION TO SNOW DURING THE SHORT TERM FORECAST PERIOD. ALTHOUGH SFC TEMPS WILL BEGIN TO FALL THRU THE LOW TO MID 30S. AND ROAD TEMPS ABV FREEZING. MODELS ARE SHOWING A DECENT FREEZING DRIZZLE SOUNDING FOR MUCH OF TUESDAY ACROSS WEST CENTRAL MN.
347 AM EST TUE DEC 15 2015 AN UPPER LEVEL TROUGH OF LOW PRESSURE WILL MOVE EAST OF THE REGION THIS AFTERNOON. THIS WILL ALLOW PRECIPITATION TO DECREASE IN AREAL COVERAGE AND BECOME MORE CONCENTRATED ACROSS THE HIGHER TERRAIN. HIGH PRESSURE BUILDS INTO THE REGION TONIGHT AND WEDNESDAY FOR DRY WEATHER.
440 AM EST TUE DEC 15 2015 A COLD FRONT EXITS THE MID ATLANTIC COAST EARLY THIS MORNING.
WITH LOW PRESSURE PULLING OFF TO THE EAST. SOME PATCHY FREEZING DRIZZLE HAD BEEN REPORTED DURING THE EVENING AND WE SHOULD CONTINUE TO SEE SOME FREEZING DRIZZLE AT TIMES OVERNIGHT.
1204 AM EST TUE DEC 15 2015 HIGH PRESSURE WILL REBUILD.
THE LATEST WATER VAPOR IMAGERY SHOWS OUR NEXT UPPER LEVEL LOW NOW SHIFTING/TRANSLATING ITS ENERGY FROM EASTERN UTAH INTO CENTRAL COLORADO. AND/OR LIGHT FREEZING DRIZZLE TO DEVELOP ACROSS CENTRAL NORTH DAKOTA. THE UPPER LEVEL LOW WILL EJECT NORTHEAST INTO CENTRAL NEBRASKA BY 00Z WEDNESDAY. THUS A COMBINATION OF LIGHT FREEZING DRIZZLE AND SNOW ARE BOTH POSSIBLE CENTRAL NORTH DAKOTA TODAY. AS A PRONOUNCED 700-500MB TROWAL/PER NAM/GFS 700-500 THETA-E-RIDGE AXIS. THIS 12HR SUSTAINMENT OF A WARM/MOIST AIR FEED COINCIDES WITH THE STRONGEST OMEGA/VERTICAL MOTION FIELD ASSOCIATED WITH THE AFOREMENTIONED UPPER LOW AS IT PASSES SOUTH AND EAST OF NORTH DAKOTA.
332 AM CST TUE DEC 15 2015 LOOKING LIKE A WIDESPREAD LIGHT PRECIPITATION SYSTEM COMING IN OVERNIGHT WITH SOME FREEZING RAIN CHANCES IN THE FAR NORTH. SURFACE PRESSURES HAVE BEEN FALLING IN THAT SAME AREA AS LOW PRESSURE WILL EJECT THROUGH MN. THE FRONTAL BOUNDARY NEAR I-70 WILL BE WORKED NORTH WITH A MOIST SURGE SOUTHEAST OF THE CYCLONE TRACK. ESPECIALLY IN THE LOW-LEVELS. BELIEVE MOST OF THE AREA WILL BE ABOVE FREEZING. BEFORE WARM ADVECTION KICKS TEMPERATURES ABOVE FREEZING /AFTER 09Z/.
FRONT THAT BROUGHT RAIN EARLIER TODAY IS WELL OFF TO OUR EAST AND THE ASSOCIATED LOW PRESSURE IS IS MOVING NORTHEAST ACROSS THE GREAT LAKES REGION. COOLER AIR HAS ALLOWED OVERNIGHT TEMPERATURES TO DROP DOWN INTO THE 40'S.
1232 AM EST TUE DEC 15 2015 UNUSUALLY RECORD WARM TEMPS TODAY WILL GIVE WAY TO COOLER BUT STILL ABOVE NORMAL TEMPS AS A COLD FRONT PUSHES THROUGH TONIGHT. HUGE STACKED LOW WILL PUSH ACROSS THE GREAT LAKES TONIGHT INTO WESTERN ONTARIO AND QUEBEC DRAGGING A COLD FRONT THROUGH THE REGION. AS UPPER LEVEL RIDGING BUILDS BACK IN ACROSS THE EASTERN CONUS. DRIER CONDITIONS WILL TAKE OVER AS THE RIDGE WORKS DEEPER INTO THE NORTHEAST.
ALLOWING OVERNIGHT LOWS TO FALL MAINLY INTO THE LOWER TO MID 40S. AN UPPER LVL TROUGH OVER THE THE MID ROCKIES. TAIL END OF COLD FRONT WILL MOVE ACROSS AREA TUESDAY NIGHT AND EARLY WEDNESDAY. HIGH PRESSURE WILL BRING COOL TEMPS AND FAIR SKIES FOR LATER IN WEEK INTO WKND. LONG WAVE TROUGH PATTERN APPEARS TO SET UP WITH DEEP SW FLOW.
151 AM CST TUE DEC 15 2015 A DYNAMIC UPPER LOW CENTERED JUST TO THE NE OF THE 4-CORNERS OVER SWRN COLORADO EARLY THIS MORNING WILL MOVE EAST TO THE FRONT RANGE AT 12Z. THIS WILL RESULT IN A DRY COLD FRONT OF PACIFIC ORIGIN TO MOVE ACROSS THE FCST AREA. WILL FAVOR WARMER MAV NUMBERS FOR TODAYS HIGHS. WHICH WILL HELP TO OOZE DOWN A COOLER CANADIAN AIRMASS /HIGHS DROPPING DOWN INTO THE 40S AND 50S/.
THE UPPER-LEVEL TROF BRINGING THE WIDESPREAD SNOW CURRENTLY EXTENDS FROM EASTERN ALBERTA THROUGH CENTRAL MT DOWN TO NEVADA/UTAH BORDER. IT WILL MAKE SLOW EASTWARD PROGRESS THROUGH TONIGHT AND CONTINUE TO WRAP MOISTURE AROUND THE TROF'S CENTRAL LOW PRESSURE AREA (NEAR SALT LAKE CITY AT 1PM). THE PERIOD FROM MIDDAY TUES TO WED MORNING WILL BE DRY AS WEAK HIGH PRESSURE RIDGING MOVES ACROSS OUR REGION. THANKS TO THE FRESH SNOW COVER AND COOL NORTHWEST FLOW ALOFT, TEMPERATURES WON'T WARM MUCH OVER NEXT COUPLE DAYS, WITH DAILY HIGHS MOSTLY ONLY IN THE LOW-MID 20S.
VERY MUCH WELCOME SEASONAL COOL TEMPERATURES IN STORE FOR SOUTH FLORIDA THIS WEEKEND BEHIND COLD FRONT MOVING THROUGH THE AMPLIFIED AND PROGRESSIVE PATTERN TAKING SHAPE ACROSS THE CONUS THIS WEEK WILL BRING CHANGES TO SOUTH FLORIDA THIS WEEKEND.
319 AM EST TUE DEC 15 2015 HIGH PRESSURE WILL REBUILD.
314 AM CST TUE DEC 15 2015 WEAK AREA OF HIGH PRESSURE IN PLACE ACROSS THE CWA. WITH ANOTHER APPROACHING LOW PRESSURE SYSTEM OFF TO THE SOUTHWEST ALONG THE FRONT RANGE OF THE ROCKIES. WINDS TO SHIFT AROUND TO THE EAST SOUTHEAST TODAY AS THE LOW APPROACHES THE AREA AND THE HIGH SHIFTS AWAY.
1153 PM EST MON DEC 14 2015 A COLD FRONT ACROSS NORTHWEST PENNSYLVANIA WILL MOVE EAST OF THE REGION THIS EVENING. HIGH PRESSURE WILL BUILD OVER THE AREA FROM THE SOUTH TUESDAY INTO WEDNESDAY.
304 AM CST TUE DEC 15 2015 REGION AT 2 AM UNDER A THICK MANTLE OF LOW CLOUDS WITH SURFACE RIDGING OVER CENTRAL IOWA.
407 AM EST TUE DEC 15 2015 CURRENTLY - AN ATLANTIC PRESSURE RIDGE EXTENDS ACROSS SOUTH FLORIDA AND THE KEYS. A TUTT CELL MEANDERS OVER EASTERN CUBA AND HISPANIOLA WHILE AN UPPER RIDGE EXTENDS NORTHEASTWARD FROM THE YUCATAN PENINSULA ACROSS FLORIDA. SUBSIDENCE IN PLACE HAS MAINTAINED WARMER AND DRIER AIR ALOFT. AND THE ASSOCIATED RIDGE WILL REMAIN ACROSS FLORIDA. BUT THE RIDGE ALOFT WILL REMAIN ACROSS FLORIDA.
336 AM CST TUE DEC 15 2015 Mid/upper level low pressure over the central Rockies is forecast to lift out over the plains later today and into tonight. At the surface a lee side low pressure will deepen in western KS, and track northeastward through north central KS this evening. As the low pressure moves eastward a warm front will lift out of the Panhandles. Closer to the low pressure track the clouds may linger much longer. Soundings show low level saturation and increasing low level lift may support light rain with the low passage in these same areas. Although the warm front is forecast to lift through the area so this may support a warm up later today regardless.
RAIN SHOWERS HAVE COME TO AN END ACROSS NORTHWEST CALIFORNIA AS LIGHT OFFSHORE FLOW DEVELOPS BEHIND A DEPARTING WEAK LOW PRESSURE SYSTEM. DRY WEATHER WILL PERSIST THROUGH MOST OF TUESDAY AND EARLY WEDNESDAY AS A HURRICANE FORCE LOW OVER THE BERING SEA SHIFTS SOUTHEASTWARD CAUSING THE RIDGE OVER THE NE PACIFIC OCEAN TO FLATTEN AND SHIFT OVER THE WESTERN UNITED STATES.
SURFACE WINDS DIMINISH AND BEGIN SHIFTING TO NORTHWEST WITH APPROACH AND PASSAGE OF COLD FRONT BETWEEN 22Z TUESDAY AND 00Z WEDNESDAY. PARTICULARLY IN NORTHERN SECTIONS CLOSER TO CLOSED LOW PASSING TO OUR NORTH. TIGHTENING HEIGHT/PRESSURE GRADIENTS ASSOCIATED WITH NEXT APPROACHING CLOSED LOW PRESSURE SYSTEM EXPECTED TO CAUSE SOUTHWEST SURFACE WINDS TO INCREASE. COLD FRONT ENTERS NORTHWEST AND NORTHERN PART OF FORECAST AREA TUESDAY AFTERNOON. COLD FRONT TO PUSH SOUTH ACROSS THE FORECAST AREA BY 00Z WEDNESDAY BRINGING BELOW NORMAL TEMPS TO THE AREA ON WEDNESDAY WITH CONTINUED DRY CONDITIONS. CLOSED UPPER LOW OVER THE GREAT BASIN AND FOUR CORNERS REGION TONIGHT WILL TRACK EAST ACROSS THE CENTRAL ROCKIES TUESDAY AND THEN ACROSS THE CENTRAL PLAINS STATES BY TUESDAY NIGHT.
351 AM CST TUE DEC 15 2015 Today will be an unseasonably warm day with increasing southerly winds ahead of a cold front that will sweep across the area tonight.
WEAK HIGH PRESSURE WILL GIVE MAINLY DRY CONDITIONS THROUGH MIDDAY TUESDAY.
340 AM CST TUE DEC 15 2015 (Today and Tonight) An upper low now centered over eastern Colorado will lift northeast across the Central Plains through tonight. Surface winds will become gusty this afternoon in the wake of the cold front as it moves east but winds will subside quickly overnight. Highs today under mostly sunny skies will range from the lower 60s over the western CWA to the upper 60s over the eastern CWA, reflecting the eastern progression of the cold front. Wednesday morning lows will generally be in the lower to mid 30s given the good radiational cooling conditions of clear skies and light winds.
327 AM EST TUE DEC 15 2015 LOW PRESSURE WILL DEVELOP ALONG THE MAINE COAST AND STRENGTHEN AS IT MOVES NORTHEAST TOWARD NOVA SCOTIA ON TODAY. HIGH PRESSURE WILL BUILD IN FROM THE NORTHWEST BEHIND THE DEPARTING LOW ON WEDNESDAY.
DRY WEATHER CAN BE EXPECTED FROM LATE TONIGHT THROUGH TUESDAY NIGHT AS A NARROW RIDGE TRAVERSES THE AREA. ANOTHER LOW PRESSURE SYSTEM AND ASSOCIATED COLD FRONT WILL BRING ADDITIONAL CHANCES FOR SHOWERS TO THE AREA WEDNESDAY INTO WEDNESDAY EVENING. WITH DRY AND SOMEWHAT COOLER CONDITIONS PREDOMINATING FOR THE REMAINDER OF THE FORECAST PERIOD. SURFACE ANALYSIS LATE THIS EVENING SHOWS DEEP LOW PRESSURE IN PLACE ACROSS THE GREAT LAKES WITH BROAD CYCLONIC FLOW IN PLACE ACROSS INDIANA. AS LOW PRESSURE ACCELERATES OFF TO THE EAST AT THE BEGINNING OF THIS PERIOD HIGH PRESSURE WILL BUILD BACK OVER THE REGION AND STRENGTHEN THROUGH THE MAJORITY OF THIS PERIOD.
A LEAD COLD FRONT WILL MOVE THROUGH EASTERN NC THIS MORNING. A SECONDARY COLD FRONT WILL STALL OVER CENTRAL NC THIS AFTERNOON THEN BE PUSHED SOUTH BY HIGH PRESSURE THAT WILL BUILD ACROSS THE MIDDLE ATLANTIC STATES TONIGHT AND WEDNESDAY. A DEEP UPPER LEVEL LOW WILL CONTINUE TO TRACK NEWD ACROSS THE GREAT LAKES TONIGHT. THE SFC COLD FRONT ASSOCIATED WITH THIS LOW IS CURRENTLY MAKING EN-ROADS INTO THE TRIAD AND WILL BE EAST OF THE AREA BETWEEN 06 TO 09Z. AN ACTIVE STORM TRACK THROUGH THE UPPER MIDWEST WILL SEND ANOTHER COLD FRONT OUR WAY WEDNESDAY NIGHT.
POCKETS OF FOG AND POSSIBLY LIGHT DRIZZLE/FREEZING DRIZZLE STILL RESIDE OVER THE FORECAST AREA THIS AFTERNOON. AFTER TONIGHT'S ROUND OF OVERCAST SKIES WITH FOG AND DRIZZLE/FREEZING DRIZZLE. WHICH WOULD REALLY SQUASH THE HIGHER END PRECIPITATION AMOUNTS AND SNOWFALL AMOUNTS OVER NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA. WHERE THE HIGHEST CONFIDENCE FOR 6 OR MORE INCHES OF SNOW COULD BE FOUND /SOUTH CENTRAL INTO CENTRAL SOUTH DAKOTA INCLUDING THE I-90 CORRIDOR UP TO PIERRE/. SNOW ACCUMS ARE FORECAST TO BE THE HIGHEST ACROSS THE MISSOURI RIVER VALLEY /GENERALLY 5 TO 10 INCHES WITH LOCALLY HIGHER AMOUNTS/ WITH LESSER AMOUNTS EAST INTO MINNESOTA /GENERALLY 3 TO 8 INCHES/.
118 AM EST TUE DEC 15 2015 SPRINKLES OR VERY LIGHT SHOWERS WILL END EARLY THIS MORNING AS TEMPERATURES FALL INTO THE LOWER 40S.
A LONG WAVE TROUGH OVER THE GREAT BASIN WILL BRING CHANCES FOR FREEZING DRIZZLE AND SNOW ACROSS THE HIGH PLAINS TONIGHT AND TOMORROW. MODEL SOUNDINGS DEPICT LOW LEVEL SATURATED LAYERS ACROSS MUCH OF THE FORECAST AREA BELOW FREEZING WITH NO ICE BEING INTRODUCED FROM ABOVE. WHICH INDICATES CHANCES FOR FREEZING FOG AND FREEZING DRIZZLE ACROSS MUCH OF THE FORECAST AREA TONIGHT THROUGH TUESDAY. BUT AREAS OF FREEZING DRIZZLE WILL CONTINUE ON A LINE FROM TRIBUNE TO AROUND HILL CITY KANSAS. BUT GENERALLY APPEAR TO BE IN THE 4-6 RANGE IN YUMA COUNTY COLORADO BY THE TIME THE UPPER LEVEL LOW SYSTEM MOVES OUT OF THE FORECAST AREA. INITIAL POSITION OF EXITING UPPER LOW WILL CONTINUE TO KEEP CHANCES FOR LIGHT -SW OVER NORTHERN ZONES. SLACKENING BY NIGHTFALL AS WEAK RIDGING BUILDS OVER THE AREA.
DEEP MOISTURE CONTINUES TO CIRCULATE INTO THE REGION THIS EVENING AROUND AN UPPER LEVEL LOW CENTERED OVER WY/UT FOR WIDESPREAD SNOW AFFECTING AREAS FROM KGTF SOUTH AND EAST. THE UPPER-LEVEL TROF BRINGING THE WIDESPREAD SNOW CURRENTLY EXTENDS FROM EASTERN ALBERTA THROUGH CENTRAL MT DOWN TO NEVADA/UTAH BORDER. IT WILL MAKE SLOW EASTWARD PROGRESS THROUGH TONIGHT AND CONTINUE TO WRAP MOISTURE AROUND THE TROF'S CENTRAL LOW PRESSURE AREA (NEAR SALT LAKE CITY AT 1PM). THE PERIOD FROM MIDDAY TUES TO WED MORNING WILL BE DRY AS WEAK HIGH PRESSURE RIDGING MOVES ACROSS OUR REGION. THANKS TO THE FRESH SNOW COVER AND COOL NORTHWEST FLOW ALOFT, TEMPERATURES WON'T WARM MUCH OVER NEXT COUPLE DAYS, WITH DAILY HIGHS MOSTLY ONLY IN THE LOW-MID 20S.
342 AM CST TUE DEC 15 2015 Upper level low over CO this morning will lift NE today as the tail end of the trough rotates down across the area Wednesday. This trough will push a Pacific front across the area today with a brisk west wind.
ANOTHER DRY AND SUNNY DAY IS EXPECTED TODAY AS WEAK HIGH PRESSURE WILL REMAIN AT THE SURFACE. HEIGHTS WILL SLOWLY RISE OVER THE REGION AS WE REMAIN BETWEEN THE BUILDING RIDGE TO THE EAST AND AN APPROACHING CLOSED UPPER LOW TO THE WEST. OVERNIGHT LOWS WILL BE COOLER IN THE EAST/NORTHEAST BUT WARMER IN THE WEST AS MOISTURE AND WARM ADVECTION AFFECT THE REGION. AS THE AFOREMENTIONED CLOSED UPPER LOW TRACKS NORTHEAST TOWARDS THE GREAT LAKES REGION ON WEDNESDAY. THIS WILL HELP DRAG A COLD FRONT TOWARD THE ARKLAMISS. THERE IS SOME POTENTIAL OF STRONG TO ISOLATED SEVERE STORMS WITH THIS IN THE FAR SOUTHEAST AS WARM FRONT MOVES INTO THE SOUTHERN SECTIONS OF THE CWA.
THE MILD WEATHER WILL TURN SHARPLY COLDER WEDNESDAY NIGHT BEHIND A COLD FRONT AFTER ONE MORE DAY OF SEASONALLY MILD WEATHER WEDNESDAY.
THIS LOW LEVEL MOISTURE LAYER IS MORE LIKELY TO AFFECT THE TAF SITE. /ISSUED 313 PM CST MON DEC 14 2015/ SUNNY SKIES PREVAIL ACROSS NORTH TEXAS THIS AFTERNOON WITH TEMPERATURES RANGING FROM THE LOWER 60S NEAR THE RED RIVER TO THE LOWER 70S SOUTH AND WEST OF THE METROPLEX. THE UPPER TROUGH TO THE WEST WILL SPREAD SOME FORCING FOR ASCENT ACROSS THE AREA TOMORROW AFTERNOON. A COLD FRONT WILL ALSO MOVE IN FROM THE WEST. THE COMBINATION OF FORCING FROM THE UPPER TROUGH AND THE FRONT ALONG WITH SOME MOISTURE SHOULD BE SUFFICIENT FOR A FEW SHOWERS TO DEVELOP TOMORROW AFTERNOON AND EVENING MAINLY ACROSS THE SOUTHEAST HALF OF THE CWA. COOLER AIR WILL CONTINUE TO FILTER INTO NORTH TEXAS THROUGH THE DAY WEDNESDAY WITH HIGHS ONLY EXPECTED TO BE IN THE LOWER 50S TO LOWER 60S ACROSS THE REGION.
THUS EXPECT DRIZZLE OR FREEZING DRIZZLE AS LARGE SCALE LIFT MOVES INTO THE AREA THROUGHOUT THE DAY TODAY.
1240 AM EST TUE DEC 15 2015 A COLD FRONT WILL CROSS THE AREA TONIGHT.
HAND ANALYSIS OF THE 08Z MSL DATA AND THREE-HOUR PRESSURE FALLS INDICATE A DEVELOPING CYCLONE OVER SOUTH CENTRAL TO SOUTHEAST COLORADO. THE CYCLONE MAKES ITS WAY INTO CENTRAL AND NORTH CENTRAL NEBRASKA WITH WRAPAROUND ISENTROPIC LIFT OVER THE SANDHILLS.
355 AM CST TUE DEC 15 2015 A FEW SPOTS ARE EXPERIENCING A COMBINATION OF FREEZING DRIZZLE/VERY LIGHT SNOW. AS FORCING INCREASES AHEAD OF THE LOW TODAY. GUIDANCE QPF HINT AT AN INCREASE IN COVERAGE OF FREEZING DRIZZLE.
MAIN DEFORMATION PRECIPITATION ON THE BACKSIDE OF THE LOW CONFINED NORTHWEST OF A LINE FROM LAKE CITY MN TO NEILLSVILLE WI. WILL CONTINUE TO SEE THE DEFORMATION RAIN/SNOW MOVE NORTH/EAST OF THE FORECAST AREA THIS EVENING AS THE LOW MOVES EAST OF LAKE HURON. BRISK NORTHERLY WINDS BEHIND THE DEPARTING LOW WILL DRAW IN COOLER AIR ACROSS THE AREA WITH OVERNIGHT LOWS EXPECTED TO BOTTOM OUT IN THE 30-35 DEGREE RANGE. INTERIM RIDGE OF HIGH PRESSURE BUILDS INTO THE REGION LATE TONIGHT THROUGH TUESDAY. PLAN ON COOLER BUT STILL ABOVE NORMAL TEMPERATURES WITH HIGHS TOPPING OFF IN THE MIDDLE 30S TO THE LOWER 40S. ATTENTION THEN TURNS TO ANOTHER STRONG AREA OF LOW PRESSURE MOVING OUT OF THE PLAINS INTO MN BY SUNRISE WEDNESDAY.
BAND OF CU ASSOCIATED WITH A SECONDARY 850 MB TROF SKIRTED SRN MIDDLE TN, BUT WAS NOW DECREASING AND WILL BE MOVING EAST OF THE AREA IN THE NEXT COUPLE OF HOURS. HIGH PRESSURE RIDGE WILL MOVE ACROSS THE TN VALLEY ON TUESDAY PRODUCING LIGHT AND VARIABLE WIND.