Aikyam-Lab/Synoptic-Bench huggingface dataset:
/ISSUED 432 AM EDT MON APR 25 2016/ HIGH PRESSURE CENTER IS SITUATED ACROSS THE MOUTH OF THE CHESAPEAKE BAY. THAT INCLUDES LOW PRESSURE. WITH THE MOIST SOUTHERLY FLOW CONTINUING ON THE BACKSIDE OF THE HIGH CENTER.
QUESTION FOR NEXT 24-48 HRS IS TRACK OF NEXT UPPER LOW THROUGH CENTRAL ROCKIES. HOWEVER SOUTHERN MONTANA WILL REMAIN UNDER THE MEAN TROF AXIS AND THUS WILL KEEP BROADBRUSHED CHANCE POPS IN THE FORECAST. BY LATE TONIGHT THE MID LEVEL FLOW AROUND THE LOW WILL PUSH PLAINS MOISTURE INTO EASTERN AND SOUTHERN ZONES FOR A BETTER CHANCE OF WIDESPREAD PRECIPITATION ALONG AND SOUTH OF A SHERIDAN TO MILES CITY LINE THROUGH TUESDAY EVENING. WHILE GENERALLY THE MODELS CONTINUE TO SHOW SEVERAL TROUGHS MOVING THROUGH.
611 AM CDT MON APR 25 2016 WEAKENING LOW PRESSURE CONTINUES EAST THIS AM. WITH THE NEXT UPPER TROF LOCATED OVER THE SOUTHERN ROCKIES THIS AM. THE BEGINNING OF THE FORECAST WILL FEATURE A WAVE/TROF MOVING EAST ACROSS THE CENTRAL PLAINS AND THEN WEAKENING AS IT SHEARS E/NE. THE NEXT WAVE/TROF IS COMING UP FAST AND EJECTS INTO THE SOUTHERN HIGH PLAINS THIS WEEKEND.
A LOW STRATUS CLOUD DECK WILL FORM EARLY THIS EVENING AND PERSIST DURING THE OVERNIGHT PERIODS DUE TO THE LOW LVL GULF MOISTURE INFLUX BENEITH THE STRONG CAPPING INVERSION.
912 AM MDT MON APR 25 2016 SEVERAL UPPER SHORT WAVES WILL CONTINUE TO ROTATE AROUND THE PERIPHERY OF THE UPPER LOW CENTERED ACROSS SOUTHERN NEVADA TODAY. THEN TAPER OFF AS THE LOW EDGES EASTWARD. UPPER LOW OVER SOUTHERN NEVADA DOMINATES THE WEATHER OVER THE REGION. MOISTURE ROTATING NORTH AND WEST AROUND THIS LOW IS SPILLING INTO SOUTHERN IDAHO AND SOUTHERN OREGON. CONDITIONS IMPROVE THIS EVENING AS THE LOW OVER NEVADA MOVES SLOWLY EASTWARD.
LOW PRESSURE WILL TRACK ACROSS THE LOWER GREAT LAKES TONIGHT AND CONTINUE MOVING OFF TO THE EAST SOUTHEAST TUESDAY. A COLD FRONT TRAILING THIS LOW WILL SLIDE ACROSS THE REGION TUESDAY AFTERNOON AND EVENING AND THEN STALL JUST SOUTH OF THE AREA THROUGH MID WEEK. HOWEVER THE COLD FRONT TRAILING THE LOW WILL SAG SOUTH ACROSS THE REGION TUESDAY AFTERNOON AND EVENING. THERE ARE SOME INDICATIONS THAT CONVECTION AHEAD OF THIS LOW MAY RACE OUT AHEAD OF THIS SYSTEM AND MOVE INTO THE AREA FROM THE NORTHWEST TONIGHT. BUT THE HIGHER CHANCE FOR SHOWERS AND THUNDERSTORMS WILL BE TUESDAY AFTERNOON AND EVENING OUT AHEAD OF THE COLD FRONT. SHEAR LOOKS TO BE MODEST WHERE THE HIGHER INSTABILITY IS EXPECTED ACROSS THE SOUTHERN COUNTIES.
1019 AM EDT MON APR 25 2016 TODAY THROUGH TUESDAY WILL FEATURE A WARM FRONT TO OUR SOUTH WHICH WILL BE FOCUS FOR CLOUDS AND PRECIPITATION. SOME AFTERNOON SUNSHINE WILL ALLOW TEMPS TO RECOVER INTO THE LOW- MID 40S FOR MOST SECTIONS. THE CLOSED UPPER LOW ACROSS ERN QUEBEC AND THE CANADIAN MARITIMES THROUGH THE PERIOD -- ALONG WITH MEAN HIGH PRESSURE ACROSS NORTHERN ONTARIO -- WILL REINFORCE NORTHERLY LOW-LEVEL FLOW REGIME ACROSS THE NORTH COUNTRY.
1009 AM EDT MON APR 25 2016 LOW PRESSURE OVER THE UPPER MIDWEST WILL PUSH EAST AND SPREAD RAIN ACROSS THE AREA LATER TODAY AND ON TUESDAY. A COLD FRONT WILL DROP INTO THE AREA FROM CANADA LATER ON TUESDAY BRINGING DRIER AND COOLER AIR. DVLPG SFC TROF OVER NRN PA WILL BE THE FOCUS FOR MORE CONV PCPN. WITH COOLER AIR DROPPING TEMPS BLO NRML THU MRNG.
IN ASSOCIATION WITH A S/W TROF. EXPECT SHOWERS TO GRADUALLY INCREASE THROUGH THE DAY AS THE SFC AND UPPER LOWS APPROACH FROM THE WEST. AND A WARM FRONT EDGES NORTH TOWARD CENTRAL WI. IN THE VCNTY OF THE WARM FRONT. AND THIS SEEMS REASONABLE GIVEN THE CLOSE PROXIMITY OF THE WARM FRONT. EXPECT HIGHS ONLY IN THE LOW TO MID 40S NORTHEAST TO THE LOW TO MID 60S FAR SOUTHWEST. WHERE PARTIAL CLEARING IS ANTICIPATED AS CANADIAN HIGH PRESSURE RIDGES IN DURING THE AFTERNOON.
HIGH PRESSURE IS SITUATED OVER THE SOUTHEAST U. COAST WHILE LOW PRESSURE TREKS ACROSS THE NORTHERN PLAINS. A COLD FRONT WILL BEGIN TO DROP SOUTH INTO THE OHIO VALLEY BY TUESDAY AFTERNOON. MEANWHILE UPPER RIDGING WILL REBUILD OVER THE MIDSOUTH THROUGH TUESDAY. TEMPS WILL REMAIN WELL ABOVE AVERAGE WITH HIGHS IN THE LOWER TO MID 80S TODAY AND TUESDAY. LOWS TONIGHT WILL BE MILD WITH READINGS IN THE LOWER TO MID 60S AREAWIDE. UPPER RIDGE AXIS WILL BE LOCATED OVER THE MIDSOUTH AND THE AIRMASS WILL BE CAPPED.
707 AM CDT MON APR 25 2016 THE SLOW MOVING LOW PRESSURE SYSTEM WAS LOCATED OVER SOUTHEASTERN SOUTH DAKOTA EARLY THIS MORNING. MOST OF THE SHOWER AND THUNDERSTORM ACTIVITY TO THE EAST OF THE LOW HAS DIMINISHED OVERNIGHT. THE LOW WILL TRACK EAST ACROSS SRN MN THIS MORNING AND AM EXPECTING BREAKS IN THE CLOUD COVER IN THOSE AREAS. THE LOW WILL BE TO THE EAST BY THE TIME PEAK DAYTIME HEATING OCCURS. THE LOW WILL SHIFT WELL EAST OF THE AREA TONIGHT. CLOUDS WILL LINGER INTO MUCH OF TUESDAY AS COOLER AIR MOVES SOUTH INTO THE REGION.
HIGH PRESSURE IS NESTLED AGAINST THE EASTERN SEABOARD AND BULGES SOUTHWEST ACROSS THE FLORIDA PENINSULA AND THE GULF OF MEXICO. THE RELIC CUMULUS LINE NOW INTERSECTS THE LOWER KEYS. WITH TEMPERATURES CLIMBING THROUGH THE LOWER 80S. UN UPPER LEVEL LOW IS RACING EAST ACROSS THE CENTRAL GULF OF MEXICO. AN EXPANSIVE AREA OF HIGH PRESSURE WILL GRADUALLY MOVE FROM THE CENTRAL UNITED STATES TO THE WESTERN NORTH ATLANTIC.
WITH AN UPPER LOW PROGRESSING EASTWARD ACROSS THE GREAT BASIN THROUGH THE DAY TODAY. THE ASSOCIATED COLD FRONT IS EXPECTED TO CROSS THE STATE LATER THIS EVENING INTO TUESDAY MORNING. EXPECT GUSTY WINDS ACROSS PORTIONS OF SOUTHERN UTAH THIS AFTERNOON AND EVENING AHEAD OF THE ADVANCING COLD FRONT. SOUTH/SOUTHEAST WINDS WILL SHIFT TO NORTHWEST 10 TO 20 KTS AROUND 26/03Z AS A COLD FRONT PUSHES THROUGH.
TODAY THROUGH TUESDAY NIGHT UPPER LEVEL ANALYSIS HAS CLOSED LOW OVER EASTERN SOUTH DAKOTA WITH PRECIP SHIELD EAST AND NORTH OF THE FORECAST AREA. LOW PRESSURE IS LOCATED ACROSS SOUTHEAST SD. WITH HIGH PRESSURE NOSING INTO NORTHEAST WYOMING. BRIEF RIDGING BETWEEN SYSTEMS WILL BRING DRIER WEATHER TO MOST OF THE AREA. NEXT UPPER LOW TO AFFECT THE FORECAST AREA MOVES ACROSS THE CENTRAL ROCKIES TONIGHT. LITTLE OR NO ACCUMULATION IS EXPECTED ACROSS THE LOWER ELEVATIONS. BUT AN INCH OR TWO WILL BE POSSIBLE ACROSS THE HIGHER ELEVATIONS OF THE BLACK HILLS BY TUESDAY MORNING. CLOSED UPPER LOW SHIFTS INTO THE CENTRAL PLAINS ON TUESDAY. WITH THE CWA ON THE NORTHERN SIDE OF THE LOW.
THE CLOSED LOW PRESSURE HAS MOVED INTO NORTHERN CALIFORNIA THIS MORNING. THE LOW IS EXPECTED TO CONTINUE TO MOVE SOUTHEAST INTO NEVADA. SNOW SHOWERS WILL CONTINUE OVER THE WARNERS THIS MORNING FROM MOISTURE WRAPPED AROUND THE LOW BUT BY THIS AFTERNOON THE ATMOSPHERE IS EXPECTED TO STABILIZE UNDER NW FLOW ALOFT. WE ARE EXPECTING LESS CLOUD COVER TONIGHT THAN PREVIOUSLY THOUGHT AND THE RADIATIONAL COOLING COULD BRING OVERNIGHT LOWS FOR SW OREGON AND NORTHERN CALIFORNIA VALLEYS INTO THE LOWER TO MID 30S AND FROST IS POSSIBLE OVERNIGHT. NO PRECIPITATION IS IN THE FORECAST FOR INLAND AREAS TUESDAY AS A RIDGE BUILDS INTO THE AREA. THE WARM FRONT IS EXPECTED TO SPREAD LIGHT RAIN INLAND TUESDAY NIGHT.
A cold front located from the low over eastern South Dakota southward through eastern Nebraska will track slowly east today and not get into our area until first thing Tuesday morning. Surface dew points in the mid to upper 50s were noted just east of the cold front and as the boundary shifts east today, so will the moist axis into our area this afternoon. Most of the high res reflectivity simulations off the 4km NAM along with the WRF-ARW and NMM indicate redevelopment in west-central Illinois later this afternoon. Surface temperatures in the lower 80s combined with dew points in the upper 50s will yield ML capes of around 1800 in a few areas along and west of the Illinois River later this afternoon.
UPPER LEVEL RIDGE FLATTENS TODAY AND INCREASED MID LEVEL CLOUDS HAVE SKIES PARTLY CLOUDY TO MOSTLY CLOUDY ACROSS WEST AND SOUTHERN PARTS OF THE REGION.
BUILDING HIGH PRESSURE SHOULD BRING CLEARING SKIES AND COOL TEMPERATURES TONIGHT.
REGIONAL 88DS ARE CORROBORATING WITH SCATTERED SHOWERS RESIDING OVER THE LOWER SABINE VALLEY/SERN TX. LOW PRESSURE OVER SW KANSAS IS ORGANIZING AND ALLOWING FOR MODERATE SOUTHERLY FLOW ACROSS THE AREA.
AND A FEW OF THESE AREAS MAY SEE TEMPERATURES FALL SLIGHTLY BELOW FREEZING AS WELL.
801 AM EDT MON APR 25 2016 HIGH PRESSURE WILL MOVE FURTHER OFFSHORE THROUGH TUESDAY. A COLD FRONT WILL CROSS THE AREA TUESDAY EVENING.
1033 AM EDT MON APR 25 2016 HIGH PRESSURE WILL MOVE FURTHER OFFSHORE THROUGH TUESDAY. A COLD FRONT WILL CROSS THE AREA TUESDAY EVENING.
HIGH PRESSURE CENTERED NEAR THE MID ATLANTIC COAST WILL CONTINUE TO BUILD OFFSHORE WITH A LOW LEVEL EASTERLY FLOW ACROSS THE REGION. (PREVIOUS DISCUSSION) HI PRES RIDGE SPANNING THE ERN SEABOARD WILL BE THE DOMINANT WX FEATURE AS IT PUSHES INTO THE W ATLC.
ELSEWHERE ACROSS CENTRAL ALABAMA, A WARM DAY IS EXPECTED WITH DEWPOINTS EDGING UP INTO THE LOWER 60S FOR MOST. ANOTHER MILD NIGHT IS IN STORE TONIGHT, WITH MAYBE A FEW SPOTS RUNNING A FEW DEGREES COOLER THAN WE ARE THIS MORNING DUE TO REDUCED CLOUD COVER. 56/GDG UPPER LEVEL RIDGING WILL KEEP CENTRAL ALABAMA WARM AND DRY TUESDAY WITH TEMPERATURES IN THE LOW TO MID 80S.
LOW PRESSURE WILL MOVE INTO THE REGION TODAY WITH STRONG SOUTHWEST WINDS FROM MID MORNING TO EARLY EVENING.
1238 PM EDT MON APR 25 2016 HIGH PRESSURE WILL PUSH OFF THE MID ATLANTIC COAST TODAY. LOW PRESSURE WILL TRACK ALONG THE NEW YORK BORDER TUESDAY. PUSHING A TRAILING COLD FRONT THROUGH PENNSYLVANIA.
826 AM EDT MON APR 25 2016 DRY AND WARMER WEATHER CAN BE EXPECTED TODAY UNDER HIGH PRESSURE. CL STRONG WARM ADVECTION IN ADVANCE OF WESTERN GREAT LAKES TROUGH IS EXPECTED TO DRIVE TEMPS 10 TO 15 DEGREES ABOVE THE SEASONAL AVERAGES THIS AFTERNOON. WITHIN FLATTENING UPPER LEVEL RIDGE. WILL USE MOST OF ITS ENERGY TO BREAK THROUGH THE AFOREMENTIONED RIDGE. THE GREAT LAKES TROUGH WILL DIG SOUTHWARD LATE TONIGHT AND ON TUESDAY AND SLOWLY DRAG A SURFACE FRONT THROUGH THE AREA TUESDAY AFTERNOON. A FEW STRONGER ONES ARE POSSIBLE DUE TO THE HIGHLY SHEARED ENVIRONMENT. THIS WILL BRING AN END TO THE SHOWERS AND STORMS AND ALSO USHER IN A COOLER AIR MASS.
A warm front close to KS/OK border early Tuesday morning may become focus for some elevated storms over far northeast portions of the forecast area through Tuesday morning. Consensus remains that dry line is established west of I-35 tuesday afternoon as negative tilt upper trough moves toward the plains states, with a strong jet streak rounding the base of the trough into the southern high plains by 00z. Expect an overall increase in storm coverage through the evening as upper low moves east with severe threat continuing a good portion of the Tuesday night period.
845 AM EDT MON APR 25 2016 HIGH PRESSURE WILL PUSH OFF THE MID ATLANTIC COAST TODAY. LOW PRESSURE WILL TRACK ALONG THE NEW YORK BORDER TUESDAY. PUSHING A TRAILING COLD FRONT THROUGH PENNSYLVANIA.
TONIGHT WILL BE THE COLDEST NIGHT OF THE WEEK WITH FREEZING TEMPERATURES LIKELY IN NORTHERN CALIFORNIA AND SOUTH CENTRAL OREGON. AFTER A BRIEF PERIOD OF RIDGING TONIGHT INTO TUESDAY.
AN AREA OF HIGH PRESSURE WILL CONTINUE TO EXTEND INTO THE AREA.
1142 AM EDT MON APR 25 2016 DRY AND WARMER WEATHER CAN BE EXPECTED TODAY UNDER HIGH PRESSURE. CL THE GREAT LAKES TROUGH WILL DIG SOUTHWARD LATE TONIGHT AND ON TUESDAY AND SLOWLY DRAG A SURFACE FRONT THROUGH THE AREA TUESDAY AFTERNOON. A FEW STRONGER ONES ARE POSSIBLE DUE TO THE HIGHLY SHEARED ENVIRONMENT. THIS WILL BRING AN END TO THE SHOWERS AND STORMS AND ALSO USHER IN A COOLER AIR MASS.
ALSO KEPT SMALL CHANCES FOR TUESDAY WITH RISING DAYTIME TEMPERATURES AND INSTABILITY AND SMALL AND WEAK DISTURBANCES MOVING ACROSS THE AREA IN WEAK RIDGING ALOFT AS SOUTHWEST FLOW RETURNS. A CLOSED UPPER LEVEL LOW PRESSURE SYSTEM WILL BE MOVING TO JUST NORTH OF THE FOUR CORNERS REGION DURING THE DAY TUESDAY AND ACROSS COLORADO BY LATE IN THE DAY. AND A WARM FRONT/STATIONARY FRONT TO THE EAST AND ACROSS THE CENTRAL PLAINS.
DEEP LAYERED ONSHORE FLOW ON EARLY SEASON BERMUDA RIDGE PATTERN KICKS IN AND PREVAILS FOR MUCH OF THE COMING WEEK.
AS THE LOW CONTINUES TO SHIFT EAST TONIGHT PCPN SHOULD BECOME LESS WIDESPREAD WITH ONLY MINOR ADDITIONAL RAIN ACCUMULATIONS. COLUMN COOLS HOWEVER WITH CLOUDS MINIMUMS WILL RANGE IN THE 30S ABOVE THE FREEZING MARK. RIDGING BUILDS INTO THE FA TUESDAY AND ANY LINGERING SHRA SHOULD GRADUALLY END. WILL SEE SLIGHTLY WARMER TEMPERATURES BUT STILL BELOW AVERAGE.
A WEAK RIDGE OF HIGH PRESSURE WILL BRING DRY WEATHER AND MUCH LIGHTER WINDS TO THE REGION FROM LATE TONIGHT THROUGH TUESDAY NIGHT.
1040 AM CDT MON APR 25 2016 AN AREA OF LOW PRESSURE OVER WESTERN MINNESOTA WILL CONTINUE WRAPPING LIGHT SHOWERS INTO THE NORTHERN PORTION OF THIS CWA. WEAKENING LOW PRESSURE CONTINUES EAST THIS AM. WITH THE NEXT UPPER TROF LOCATED OVER THE SOUTHERN ROCKIES THIS AM. THE BEGINNING OF THE FORECAST WILL FEATURE A WAVE/TROF MOVING EAST ACROSS THE CENTRAL PLAINS AND THEN WEAKENING AS IT SHEARS E/NE. THE NEXT WAVE/TROF IS COMING UP FAST AND EJECTS INTO THE SOUTHERN HIGH PLAINS THIS WEEKEND.
CLOUDS SHOULD BREAK A BIT MORE BY THE AFTERNOON AND ALLOW HIGHS TO REACH THE LOW TO MID 80S.
HIGH PRESSURE WILL REMAIN IN CONTROL FOR MUCH OF THE WEEK AS WINDS SHIFT TO THE SOUTHEAST TONIGHT AND TO THE SOUTHWEST BY MID WEEK AS HIGH CONTINUES TO MOVE OFF TO THE NORTHEAST.
1036 AM EDT MON APR 25 2016 HIGH PRESSURE WILL PUSH OFF THE MID ATLANTIC COAST TODAY. LOW PRESSURE WILL TRACK ALONG THE NEW YORK BORDER TUESDAY. PUSHING A TRAILING COLD FRONT THROUGH PENNSYLVANIA.
CURRENT TEMPS ARE ALREADY IN THE LOW/MID 70S AS CLOUD COVER CONTINUES TO LIFT NE AND PLENTIFUL SUNSHINE PREVAILS. HIGH TEMPS ACROSS THE TN VALLEY WILL REACH INTO THE 80S BY THIS AFTERNOON AS HIGH PRESSURE LINGERS ACROSS THE SOUTHEAST.
Any rainfall that does reach the Lower Valley from upstream looks to occur by or after sunset Saturday. High pressure will remain dominant at the sfc, combining with lower press over the Southwest Gulf to support weak northwest to north winds. tilted mid level H5 closed low is situated over far West TX and Southern NM. Flow around this low is streaming ample moisture into the region. keeping us rather cool and cloudy across portions of the Lower RGV. rain free conditions will not likely last long as the closed low begins to reorient itself and tilts more upright. The trough will slowly get absorbed by the mean flow and will eventually become an open wave late in the period.
Westerly flow aloft ahead of a mid-upper level trough across the TN valley will spread considerable cirrus overhead across ECFL into this afternoon. Expect a coastal trough to develop near the east coast some low level moisture return east of the low level trough and across NE FL.
This trough is only allowing for an increase in some high clouds across eastern Kentucky. Highs today will be several degrees cooler compared to yesterday, with readings generally peaking in the low to mid 50s. Ridges will be the only spots likely not seeing several hours of sub-freezing temperatures.
This next system is moving into western Oregon and Washington at the moment, with this system's cold front still looking to move through the interior northwest between 4 and 10 AM Saturday.
329 AM CST Sat Nov 12 2016 A front located north of the forecast area this morning is forecast to get a push through the region today as a trough swings across the northeast U. Temperatures will only be slightly cooler.
Latest upper air analysis shows the closed low over Northern Mexico and ridge over the western CONUS have moved little from yesterday. At the surface a high pressure in Nebraska was moving southward. Behind the ridge winds were turning back to the south. Tonight lows will be similar to last night for the northwest half of the Tri-State Area, with cooler values expected for the southeast half where the ridge axis will be. Due to a very favorable setup for radiational cooling, lows for this part of the area will fall to the low 20s.
346 AM CST Sat Nov 12 2016 (Today and Tonight) As another cold front continues to move south across Texas, expect beautiful Fall weather for the next 24 hours, with temperatures cooler than seasonal normals.
153 AM EST Sat Nov 12 2016 A cold front will be south of the area today. The pressure ridge behind the front will extend through the Ohio River Valley.
1011 PM MST Fri Nov 11 2016 Massive ridge of high pressure remains in place over the region bringing mild and dry weather.
331 AM CST Sat Nov 12 2016 This morning an upper ridge extends from Mexico northward over the Rockies as an upper trough sags down across the Southeast. A secondary low over the Panhandle will combine with the trough to displace the ridge westward.
With return flow pressure gradient tightening up across central South Dakota, south-southeast breezes have developed. High pressure will move off to the east overnight with a south/southwest wind component and a pressure gradient peaking around 14mb across the state by morning.
347 AM EST Sat Nov 12 2016 A large area of high pressure is centered over the middle Mississippi Valley tonight. A weak trough is draped across the northern Gulf of Mexico.
with many locations now hovering int the lower to middle 30s north of the Missouri River. overnight lows should be a few degrees warmer than this morning's.
1252 AM EST Sat Nov 12 2016 Aviation High pressure over the Ohio Valley will provide plenty of sunshine this weekend.
Upper- level trough across the Deep South to maintain partly cloudy skies across much of the region throughout the day with afternoon high temperatures forecast to climb into the mid to upper 60s.
Northerly winds may be gusty at times Saturday in the wake of a cold front passing through the region tonight. /DL/ A weak cold front is situated just to the north of the CWA currently.
1234 AM EST Sat Nov 12 2016 High pressure will build into the region overnight. Temperatures will drop below freezing over the entire area in the morning.
The aforementioned closed upper low is not the typical pattern that you would see when dealing with the 1st potential freeze of the season.
Lows tonight will be warmer than Saturday morning as there will be a south component to the wind pumping up some warmer air.
428 AM EST Sat Nov 12 2016 High pressure will build across the eastern U.
1021 PM CST Fri Nov 11 2016 High pressure settle south through the night which will allow for light winds in many locations most of the night.
Widespread subsidence with this high along with ample dry air in the mid and upper levels kept the region totally cloud free and with very little wind this morning, allowing temperatures to fall into the upper 20s and low 30s with the coldest temperatures in areas where winds were able to go totally calm. Thus expect winds to remain light tonight especially in eastern KS and lows should fall again into the lower 30s. Expect it to be a bit warmer in northwest parts of the forecast area where winds are likely to be more persistent through the night, helping keep the boundary layer mixed.
High clouds will continue to stream over the region on southwesterly flow aloft, but VFR expected to prevail with dry conditions in the lower levels. Near latitudinal mid/upper trof dropping south through the plains and Mississippi valley will be sufficient to advance a weak front into the area overnight with boundary stalling near the coast. Expecting highs again to make it into the low 70s Saturday which is near our seasonal norm. Cutoff low over the southwest CONUS which has been responsible for the influx of Pacific moisture through the mid-week is in the process of phasing with plains trof and kicking out while weakening. Leftover southward troffing of feature will approach the area for the latter part of the weekend accompanied by another round of cirrus.
247 AM EST Sat Nov 12 2016 A dry cold front continues to move through the region early this morning. bringing a slightly cooler air mass into the region for today.
Very dry airmass over Nebraska under the upper ridge tonight with 0. Clear skies but with low level jet winds will stay mixed especially over north central Nebraska and moisture returning lows will range from the low 30s southwest to around 40 over north central.
349 AM EST Sat Nov 12 2016 A large area of high pressure will build slowly south across the central Mississippi Valley region into the Ohio Valley by tonight.
Much Warmer Weather Returns Next Quiet and seasonably pleasant weather expected this weekend. As the high moves over the area tonight, temperatures will be coldest so far this season for most areas.
Low level cold advection is already cutting off as height rises from anomalous nearly 580 dm mid-level ridge over the Plains spread east. Winds will quickly diminish this evening, especially away from Lake Michigan as the high moves overhead.
Very mild temperatures will be seen southwest where an elevated mixed layer across western North Dakota will support highs substantially warmer than guidance. Tonight an approaching cold front, which will bring modified Pacific air, will move through the region dry.
Cold front now over central Ga and SC will push south across the area today as strong high pressure moves into the mid-Atlantic states. An inverted trough will form over the waters by this evening which will keep the strongest onshore winds north of St.
/Today through Tonight/ With high pressure over the state and clear skies, temperatures have been able to dip into mid and upper 20s in many locations already. As high pressure slides southward, tightening press gradient and southerly winds to return.
346 AM CST Sat Nov 12 2016 An upper level trough moving southeast across the northeastern Conus extends southwest towards the mid Mississippi Valley. This western extension of the trough will begin to stretch and weaken while the northern portion races east into the Atlantic ocean. Still should be enough southward progression today to reinforce high pressure and cooler/drier air mass over the region.
338 AM CST Sat Nov 12 2016 The synoptic pattern this morning is characterized by a 500mb ridge over the central and northern High Plains with a trough extending from Virginia westward to the Mid-South region. As the 500mb trough to our north continues to move southward, so will the area of high pressure and shallow cold advection regime.
A very subtle cold front is pushing across the area this morning. While there will be no appreciable change in the low levels, the front will help reinforce the existing airmass. Behind the front, high pressure centered over the Ohio Valley will build across much of the eastern U.
These conditions combined with a cooler airmass over the region will allow for near seasonal average high temperatures today and tonight. Locations across parts of Northeast Oklahoma and Northwest Arkansas could approach the freezing mark tonight with patchy areas of frost possible.
A weak cold front will sweep through the North Bay tonight bringing a chance for rain.
Sun night min temps under dry conditions and mostly clear skies will range from the mid 30s inland to the lower to mid 40s near the Great Lakes. Late week, attention turns to what could be a significant mid-upper trough moving out over the Plains and the associated strong low pres center. The more western track of the 12z GFS tracks the low near KIWD by Fri evening while the 00z ECMWF brings the low toward central Upper Mi. Tight gradient developing in warm sector ahead of the low will likely result in windy conditions beginning late Thu and continuing into Fri with GFS model soundings indicating peak 925 mb winds to 40 knots with even higher winds to 50 knots over Lake Mi.
350 AM EST Sat Nov 12 2016 High pressure and a dry airmass will settle into the region through the weekend with the dry weather continuing into the first part of the work week. A sharp 500 mb trough axis is pushing south across the Ohio Valley early this morning but the net result of this is just a band of some high level cloudiness. Meanwhile, we are still seeing some spotty remnant lake effect clouds across northeast portions of our fa but these clouds should continue to dissipate through daybreak as the low level flow becomes more easterly and weakens.
As it does so, the wind will pick up from the southwest during the afternoon and scour out the cold air in the low levels. The low pressure system off the Pacific NW coast today will move inland and erode the long wave ridge over the central states tonight.