Aikyam-Lab/Synoptic-Bench huggingface dataset:
/ISSUED 304 AM CST TUE JAN 20 2015/ HIGH PRESSURE EXTENDS FROM FLORIDA ACROSS MUCH OF THE NORTHERN GULF OF MEXICO. LOW PRESSURE NEAR THE CONFLUENCE OF THE OHIO AND MISSISSIPPI RIVERS HAS A COLD FRONT TRAILING SOUTHWEST INTO TEXAS EARLY THIS MORNING.
532 AM CST TUE JAN 20 2015 MINOR UPDATE TO ADJUST COVERAGE AND TIMING OF FREEZING DRIZZLE BASED ON LATEST SHORT RANGE GUIDANCE. LATEST RAP/HRRR TRENDS DEPICT THE INCOMING LOW PRESSURE SYSTEM TOO FAR SOUTH TO CAUSE MORE THAN A DUSTING OF SNOW IN THE FAR SOUTHWEST CWA. INTERMITTENT FLURRIES AND/OR FREEZING DRIZZLE POSSIBLE THIS MORNING INTO THE AFTERNOON AS THE NEXT LOW PRESSURE SYSTEM TRACKS ACROSS CENTRAL MINNESOTA. FLURRIES AND FREEZING DRIZZLE POSSIBLE AT TIMES.
CONTINUED THE MENTION OF FREEZING DRIZZLE CENTRAL WHERE ICE CRYSTALS CONTINUE TO LACK IN THE ATMOSPHERIC COLUMN.
A cold front will slide across the area during daylight hours and shift winds around to the north at about 10 knots.
The low will move northeastward through the day, increasing rain chances along the Florida Panhandle to around 20%.
A DRY COLD FRONT MOVING IN FROM THE NW WILL INDUCE A WIND SHIFT TO THE NW DURING THE AFTERNOON. AS HIGH PRESSURE TO THE SE MOVES EWD INTO THE SRN ATLANTIC BASIN. AS WEAK HIGH PRESSURE BRIEFLY RETURNS TO THE SE REGION IN THE WAKE OF THE FRONTAL PASSAGE FROM TUE NIGHT. WITH THE LATTER HALF OF THE GLOBAL MODELS STILL POINTING TOWARD A DEVELOPING LOW PRESSURE SYSTEM/SFC WAVE. AS THE LOW PRESSURE SYSTEM LIFTS INTO THE SRN/MID ATLANTIC BASIN. WHAT MAY BEAR WATCHING WILL BE THE NEXT INFLUX OF COOLER AIR INTO THE REGION HEADING INTO THE NEW WEEK. AS A CLIPPER LIKE UPPER LOW/TROUGH AXIS DIVES SEWD ACROSS THE PLAINS STATES AND INTO THE MIDWEST/TN VALLEY REGIONS.
A COLD FRONT WILL MOVE ACROSS THE AREA TODAY AND INTO THIS EVENING. COOLER AIR AND INCREASED CLOUD COVER WILL RESULT IN SLIGHTLY COOLER BUT STILL ABOVE NORMAL AFTERNOON HIGHS FOR WEDNESDAY.
QUICK UPDATE TO REMOVE ANY FREEZING PRECIP MENTION AND CONFINE TO RAIN/SNOW MIX THROUGH THE AFTERNOON. ESPECIALLY AS TEMPERATURES ARE NOW GENERALLY ABOVE FREEZING.
911 AM EST TUE JAN 20 2015 LOW PRESSURE WILL TRACK NORTHEAST ACROSS LABRADOR TODAY. HIGH PRESSURE WILL BUILD ACROSS THE REGION TONIGHT THROUGH WEDNESDAY.
AN UPPER LEVEL RIDGE WILL SHIFT OVER THE REGION TODAY AND WEDNESDAY FOR DRY WEATHER WITH MOSTLY SUNNY AFTERNOONS AND PATCHY MORNING FOG.
STRONG HIGH PRESSURE RIDGING WILL GIVE WAY TO A SHORT WAVE AND ASSOCIATED COLD FRONT THAT WILL MOVE INTO THE DELTA THIS MORNING AND PROGRESS ACROSS THE AREA THROUGH THE AFTERNOON INTO THE EVENING HOURS. HIGH PRESSURE RIDGING AND LIGHT NORTHEASTERLY WINDS WILL PREVAIL ACROSS THE AREA ON WEDNESDAY. AFTERNOON HIGHS WILL BE A LITTLE COOLER MAINLY IN THE UPPER 50S TO LOWER 60S.
VERTICAL WIND PROFILE FROM THE NAM12 INDICATES LITTLE OR NO MIXING IN THE LOW LAYER IN THE SJV. UPPER RIDGE RETURNS TONIGHT THROUGH WED NIGHT WITH LOW CLOUDS.
SOME OF THE HIGH RES MODELS INDICATE THIS RAIN MOVING INTO THE EASTERN OKLAHOMA PANHANDLE AS WELL. ALTHOUGH DRY AIR AT THE LOW-LEVELS SHOULD PREVENT THIS FROM REACHING THE GROUND. MEANWHILE A COLD FRONT CONTINUES TO SLIDE SOUTH ACROSS THE TEXAS PANHANDLE EARLY THIS MORNING.
1020 AM EST TUE JAN 20 2015 COOL AND CLOUDY DAY ON TAP AS A LOW AMP MID/UPR LVL TROF OVER THE ERN GOMEX PUSHES ACRS THE FL PENINSULA. HI PRES RIDGE AXIS OVER N FL WILL GENERATE A LIGHT TO GENTLE SRLY BREEZE ACRS THE LCL ATLC.
622 AM EST TUE JAN 20 2015 WEAK LOW PRESSURE WILL MOVE ACROSS THE AREA TODAY. A SECOND LOW PRESSURE SYSTEM WILL DEVELOP OVER THE MIDWEST AND MOVE ACROSS THE REGION ON WEDNESDAY.
947 AM EST TUE JAN 20 2015 HIGH PRESSURE WILL MOVE OFF THE SOUTHEAST COAST TODAY. A DRY COLD FRONT WILL MOVE ACROSS THE AREA TONIGHT INTO WEDNESDAY.
1208 AM EST WED JAN 21 2015 HIGH PRESSURE PASSING TO THE NORTH WILL NOSE INTO THE AREA THROUGH WEDNESDAY MORNING.
349 AM CST WED JAN 21 2015 LOW PRESSURE OVER NORTHEASTERN IA WILL MOVE TO THE UPPER OH RIVER VALLEY THIS AFTERNOON. HIGH PRESSURE WILL DOMINATE THE AREA TONIGHT INTO THE WEEKEND.
A WEAK COLD FRONT MOVED THROUGH THE AREA AND WILL KEEP TEMPS A BIT COOLER TODAY COMPARED TO YESTERDAY, BUT SHOULD STILL SEE TEMPS IN THE MID TO UPPER 50'S ACROSS MUCH OF THE AREA. MOSTLY CLOUDY TO OVERCAST SKIES SHOULD CLEAR OUT A BIT TODAY AS WELL FROM WEST TO EAST, BEFORE MORE CLOUDS MOVE IN FROM THE NORTH TONIGHT ALONG WITH COOLER AIR.
AN UPPER LEVEL RIDGE WILL MOVE ACROSS WESTERN WASHINGTON TONIGHT AND WEDNESDAY FOR ANOTHER DRY DAY.
403 AM EST WED JAN 21 2015 COLD FRONT WILL CROSS THE AREA THIS MORNING.
MAY ALSO BE A BRIEF PERIOD OF -ZL/-ZR MAINLY IN THE SOUTHWEST CWA EARLY THIS MRNG AS IR SATELLITE ENHANCEMENT SHOWING WARMER CLOUD TOPS IN THIS REGION AT 08Z. LOW TO MID LEVEL MOISTURE LINGERS THROUGH MOST OF TONIGHT AS WEAK MID-LEVEL TROF SAGS SOUTH THRU SRN WI.
1249 AM EST WED JAN 21 2015 COLD FRONT WILL CROSS THE AREA THIS MORNING.
TEMPERATURE INVERSION IS BECOMING ESTABLISHED BY VIRTUE OF A MID/UPPER LEVEL RIDGE OF HIGH PRESSURE JUST OFFSHORE, WHICH WILL BUILD OVER THE FORECAST AREA OVER THE NEXT SEVERAL DAYS.
LITTLE IMPROVEMENT IS ANTICIPATED IN VISIBILITIES DURING THE OVERNIGHT HOURS AS MOISTURE REMAINS POOLED ALONG AN ALMOST STATIONARY COLD FRONT DRAPED FROM NEAR BRENHAM TOWARDS LIVINGSTON. AS THE REMNANTS OF THE COLD FRONT DRIFT TOWARDS THE COAST WEDNESDAY MORNING. A DEVELOPING COASTAL TROUGH AHEAD OF AN APPROACHING DISTURBANCE WILL TIGHTEN THE SUFACE PRESSURE GRADIENT AND INCREASE WIND SPEEDS TO NEAR 10 TO 15 KNOTS THROUGH THE REMAINDER OF THE TAF PERIOD.
346 AM EST WED JAN 21 2015 HIGH PRESSURE WILL BUILD ACROSS THE REGION THROUGH TODAY.
1245 AM EST WED JAN 21 2015 /ISSUED 832 PM EST TUE JAN 20 2015/ WEAK COLD FRONT WILL CONTINUE TO SAG SOUTHWARD OVERNIGHT. WEDNESDAY SHOULD BE SLIGHTLY COOLER IN THE WAKE OF THE TRANSLATED DRY FROPA ALONG WITH NW SFC WINDS.
DESPITE THE COOLER AIR MASS. THIS WILL SET THE STAGE FOR SOME RIDGE/VALLEY TEMPERATURE SPLITS TONIGHT.
AN INVERTED TROUGH EXTENDED FROM THIS SECONDARY LOW NORTHWARD TO BETWEEN BISMARCK/JAMESTOWN AND BETWEEN MINOT/RUGBY. EAST OF THIS INVERTED TROUGH WINDS WERE NORTHEAST AND AREAS OF LIGHT FOG PERSISTED THROUGH THE NIGHTTIME HOURS. WEST OF THIS INVERTED TROUGH WINDS WERE FROM THE NORTHWEST. A POLAR HIGH PRESSURE AIRMASS WAS CENTERED OVER SOUTHERN MANITOBA AND COLDER AIR WAS FILTERING INTO NORTHERN NORTH DAKOTA WHERE TEMPERATURES HAD DROPPED INTO THE TEENS. THE POLAR HIGH PRESSURE OVER MANITOBA THIS MORNING IS FORECAST TO MOVE SOUTH INTO THE RED RIVER VALLEY. HIGHS TODAY SHOULD RANGE FROM THE TEENS IN THE TURTLE MOUNTAINS (NEAR THE POLAR HIGH) TO THE LOWER 30S IN THE FAR SOUTHWEST. TONIGHT A VIGOROUS LOW PRESSURE SYSTEM MOVING EAST OUT OF THE CANADIAN ROCKIES TOWARDS HUDSON BAY WILL GENERATE A RATHER TIGHT SURFACE PRESSURE GRADIENT.
HIGH PRESSURE IS OVER THE NORTHERN ROCKIES THIS MORNING AND WILL KEEP THINGS DRY OVER THE FORECAST AREA TODAY AND MOST OF TONIGHT. BY LATE TONIGHT LOW PRESSURE DEVELOPS OVER SOUTH TEXAS.
High pressure building into the interior overnight and Wednesday. This should help to lower the stratus deck for Wednesday morning and make it easier for the low clouds to dissipate during the day. Depth of the layer is still deep enough to bring low clouds and fog into the eastern foothills once again tonight but as high pressure builds the stratus and low clouds should be reduce to below 1500 feet Wednesday morning.
1215 AM EST WED JAN 21 2015 HIGH PRESSURE WILL BUILD IN FROM THE WEST TONIGHT THROUGH WEDNESDAY. LOW PRESSURE WILL PASS OUT TO SEA SOUTH OF NEW ENGLAND WEDNESDAY NIGHT.
1141 PM CST TUE JAN 20 2015 MAIN DRIVER OF SHORT TERM WX IS A WEAK CYCLONE WHICH IS SLATED TO CONTINUE TO PROPAGATE SOUTHEASTWARD FROM THE DAKOTAS THROUGH SOUTHERN MINNESOTA AND MAKE IT ACROSS NORTHEASTERN IA BY 12Z TONIGHT. THE GFS IS WAY UNDER-DOING MOISTURE IN THE LOW LEVELS OF THE ATMOS. LIGHT NORTHWEST FLOW WILL PERSIST ON WEDNESDAY AND WEDNESDAY NIGHT AS ONE LAST WEAK LOBE MOVES THROUGH THE DEPARTING 500 MB TROUGH. BUT SOME MIX OF RAIN AND SNOW IS LIKELY WITH SNOW THE PREDOMINANT P-TYPE ACROSS OUR NORTHERN COUNTIES AND PERIODS OF DRIZZLE OR FREEZING DRIZZLE POSSIBLE.
358 AM EST WED JAN 21 2015 LOW PRESSURE WILL AFFECT THE MID-ATLANTIC TODAY.
108 AM EST WED JAN 21 2015 A RIDGE OF HIGH PRESSURE WILL PUSH ACROSS NEW YORK AND NORTHERN PENNSYLVANIA.
315 AM EST WED JAN 21 2015 A LARGE AREA OF HIGH PRESSURE OVER EASTERN CANADA AND THE NORTHEAST PLENTY OF SUNSHINE.
A dry cold front off to our northwest will advance southeastward and pass through the FA later this morning. Temps will be very mild for mid January with highs reaching the lower to mid 70s.
1014 MB LOW PRESSURE WAS OVER EASTERN IOWA WHILE 1024 MB HIGH PRESSURE WAS OVER SOUTHWEST QUEBEC CANADA. THE WEAK AREA OF LOW PRESSURE WILL WILL TRACK BY TO THE SOUTH OF THE REGION LATER TODAY INTO THIS EVENING WITH LITTLE OR NO NOTICEABLE IMPACT ON THE SENSIBLE WEATHER (EXCEPT FOR TO PERHAPS BRING A FEW FLURRIES TO THE FAR SOUTH). A WEAK UPPER LEVEL CLOSED LOW WILL THEN MOVE THROUGH LATE TONIGHT. THE LOW LEVEL FLOW WILL THEN PICK UP JUST ENOUGH OUT OF THE NORTHWEST AND COMBINE WITH MARGINALLY COLD ENOUGH AIR TO PERHAPS BRING SOME LIGHT LAKE EFFECT SNOW SHOWERS OR FLURRIES TO NORTHWEST LOWER AND NORTHERN CHIPPEWA COUNTY. PATTERN OVERVIEW/FORECAST: LONG WAVE TROUGHINESS STRETCHES DOWN THROUGH EASTERN CANADA ACROSS THE GREAT LAKES WITH RIDGING UPSTREAM ALONG THE WEST COAST OF NOAM.
349 AM CST WED JAN 21 2015 SNOW WILL GRADUALLY TAPER OFF TODAY AS SUBSIDENCE AND HIGH PRESSURE BUILDS IN LATER TONIGHT.
SLIGHTLY COOLER AIR WILL MOVE INTO THE REGION THROUGH THE REST OF THE WEEK. WITH HIGH PRESSURE PROVIDING DRY CONDITIONS. AS SOME POTENTIAL FOR BRIEF PERIODS OF FREEZING RAIN TO MIX IN BEFORE NOON IN THE NORTH BEFORE WARMING TO CHANCE OF RAIN.
AT THE SURFACE, A WEAK COLD FRONT WILL SLOWLY MOVE THROUGH NORTHERN AND CENTRAL FLORIDA THIS AFTERNOON.
OUTSIDE THE OFFICE HERE IN GFK IT SEEMS TO BE MOSTLY VERY LIGHT FREEZING DRIZZLE. FREEZING DRIZZLE AND A BIT OF LIGHT SNOW WILL LINGER IN THE NORTH FOR A LITTLE WHILE THIS MORNING. BUT THINK THAT SOME COLDER AIR WILL MOVE IN DURING THE DAY AS HIGH PRESSURE ARRIVES OVER THE NORTHERN PLAINS. THE HIGH WILL BE A DIRTY ONE.
225 AM EST WED JAN 21 2015 HIGH PRESSURE WILL BUILD IN FROM THE WEST TODAY AND TONIGHT.
1215 AM EST WED JAN 21 2015 WEAK MID LEVEL TROUGH WILL CONTINUE TO MOVE EAST AWAY FROM SOUTH FLORIDA BUT LINGERING VFR CIGS BKN-OVC050-070 WILL REMAIN FOR THE NEXT FEW HOURS. /ISSUED 400 PM EST TUE JAN 20 2015/ A WEAK TROUGH OF LOW PRESSURE IS MOVING ACROSS SOUTH FLORIDA. AS THIS LOW CROSSING THE CWA, ANOTHER LOW WILL FORM OFF THE OUTER BANKS OF NORTH CAROLINA. THIS NEW LOW WILL BRING A WEAK COLD FRONT INTO THE AREA.
242 AM EST WED JAN 21 2015 A RIDGE OF HIGH PRESSURE WILL PUSH ACROSS NEW YORK AND NORTHERN PENNSYLVANIA.
DESPITE THE COOLER AIRMASS. THIS WILL SET THE STAGE FOR SOME RIDGE/VALLEY TEMPERATURE SPLITS TONIGHT.
1030 PM MST Tue Jan 20 2015 UPDATE TO AVIATION The main change to the forecast was to add patchy freezing fog to some of the southwest valleys (including Helena and Bozeman) and also over a few river valleys of central Montana. Winds should be light and there should be enough low level moisture for at least patchy freezing fog.
1145 PM EST TUE JAN 20 2015 AN AREA OF WEAK LOW PRESSURE OVER IOWA WILL MOVE EAST ACROSS THE AREA ON WEDNESDAY.
1231 AM EST WED JAN 21 2015 HIGH PRESSURE WILL BUILD ACROSS THE REGION OVERNIGHT THROUGH WEDNESDAY.
SUCH A CHANGE IN ONLY 24 HOURS IS NOTEWORTHY FOR THIS LOCATION AND INDICATIVE OF A PERIOD OF SUSTAINED LARGE-SCALE ASCENT THROUGH THE LOWER AND MIDDLE TROPOSPHERE. DESPITE THE EAST-NORTHEASTWARD DEPARTURE OF THE SHORT- WAVE TROUGH WHICH FORCED THE ASCENT AND SUBSEQUENT THERMODYNAMIC CHANGES LOCALLY. AIR TEMPERATURES REMAIN IN THE LOWER 70S IN MOST OTHER COMMUNITIES WHERE THE BREEZE IS SLIGHTLY GREATER. FOR TODAY -- SHOWERS SHOULD GRADUALLY END OVER THE STRAITS OF FLORIDA AS SLIGHTLY DRIER AIR WORKS INTO THE LOWER TROPOSPHERE ABOVE INCREASINGLY DIFLUENT BUT WEAK BOUNDARY LAYER FLOW.
248 AM EST WED JAN 21 2015 LOW PRESSURE WILL MOVE ACROSS THE AREA TODAY. HIGH PRESSURE WILL BUILD IN TO END THE WEEK. OMEGA FIELDS AND MOISTURE PROFILES INDICATE A DECENT BURST OF SNW IS PSBL GENLY FOR AREAS N OF THE I 70 CORRIDOR AND IN THE RIDGES. THOUGH BROAD UPR TROFG WL RMN KEEPING CHCS FOR SNW SHWRS IN THE FCST. MDLS HAVE TRENDED FURTHER NW WITH THE WRN SHEILD OF PCPN ASSOCIATED WITH THE LOW. THE FIRST HALF OF NXT WEEK CONTS TO LK UNSETTLED AND DREARY WITH MDLS MAINTAINING A HIGH AMPLITUDE TROF OVR ERN NORTH AMERICA WITH SHRTWVS PROGRESSING THROUGH THE BASE.
WITH CLDS AND WK WRM ADVCTN AHD OF THE LOW. ALONG THE RIDGES. EXPECT SOUTHWESTERLY FLOW WILL HELP TO SCOUR OUT AND WARM THE OTHER RIDGE COUNTIES. TEMPERATURES WILL LIKELY STAY JUST AROUND FREEZING.
SFC WINDS WILL BECOME LGT/VRBL EARLY TUESDAY EVENING AS RIDGE SETTLES INTO THE REGION.
1234 AM EST TUE FEB 24 2015 HIGH PRESSURE IN THE OHIO VALLEY WILL MOVE EAST TONIGHT. A REINFORCING SHOT OF ARCTIC AIR WILL MOVE IN BEHIND THE FRONT FOR THE LATER PART OF THE WEEK AS HIGH PRESSURE BUILDS OVER THE PLAINS. WARM AIR WILL BE PULLED INTO THE REGION ON TUESDAY AHEAD OF THE COLD FRONT.
WHERE PERIODS OF LIGHT FREEZING RAIN WILL BE POSSIBLE OVERNIGHT. WE WILL LEAVE THE FREEZING RAIN ADVISORY INTACT ACROSS CHOCTAW COUNTY WHERE LIGHT ICING ON ELEVATED OBJECTS. INCLUDING BRIDGES AND OVERPASSES WILL BE POSSIBLE THROUGH EARLY TUESDAY MORNING. FREEZING RAIN ADVISORY UNTIL 8 AM TUESDAY FOR THE FOLLOWING ZONES: CHOCTAW.
DRY AND WARMER TUESDAY BUT WITH GUSTY NORTH WINDS IN PARTS OF SAN BERNARDINO.
159 AM EST TUE FEB 24 2015 AN ARCTIC HIGH PRESSURE WILL PROVIDE THE NORTH COUNTRY WITH MAINLY CLEAR SKIES AND LIGHT WINDS OVERNIGHT. ANOTHER WEAK AREA OF LOW PRESSURE WILL APPROACH THE REGION ON TUESDAY WITH INCREASING CLOUDS AND DEVELOPING SOUTHERLY WINDS.
1025 PM CST Mon Feb 23 2015 Light freezing drizzle has been reported across the CWA and will likely persist through the overnight hours. Slick spots will be possible on bridges and overpasses, as usual, the Special Weather Statement covers that hazard nicely.
400 AM EST TUE FEB 24 2015 A WEAK RIDGE OF HIGH PRESSURE WILL BE OVER THE NORTH COUNTRY TODAY.
AND REACHED THE LOWER FLORIDA KEYS A FEW HOURS AGO.
/UPDATE FOR 06Z TAFS/ LIGHT FREEZING PRECIPITATION IS THE MAIN FORECAST CONCERN FOR THE NEXT FEW HOURS. AND THE SYNOPTIC MODELS SEEM EVEN MORE EAGER TO DRY OUT THE LOWER LEVEL CIGS. STILL EXPECTING A CHANCE FOR FREEZING DRIZZLE OR VERY LIGHT FREEZING RAIN. FREEZING DRIZZLE CONTINUES ACROSS THE NORTHEASTERN PART OF SOUTH CENTRAL TEXAS THIS AFTERNOON. THERE IS A SLIGHT CHANCE FOR FREEZING DRIZZLE ACROSS THE NORTHEAST COUNTIES THIS EVENING THROUGH TUESDAY MORNING. BRIDGES AND OVERPASSES. SINCE THERE IS A SLIGHT CHANCE FOR FREEZING DRIZZLE TONIGHT THROUGH TUESDAY MORNING.
All TAF sites will see a break in the cloud cover at some point tonight/Tues morning, before clouds steadily increase and lower Tues aftn/eve ahead of a cold front pushing south from Alberta.
/ISSUED 946 PM CST MON FEB 23 2015/ FREEZING RAIN AND SLEET COMING TO END ACROSS THE CWA THIS EVENING WITH ONLY A FEW PATCHES SHOWING ON RADAR. WITH A SLIGHT CHC OF FREEZING DRIZZLE AND LIGHT RAIN FOR THIS AREA. AREAS NORTH OF THE INTERSTATE 20 CORRIDOR EXPERIENCING WIDESPREAD LIGHT SLEET AND SNOW WHILE AREAS TO THE SOUTH OF INTERSTATE 20 ARE BEGINNING TO EXPERIENCE SLEET AND FREEZING RAIN CONDITIONS.
402 AM EST TUE FEB 24 2015 ARCTIC HIGH PRESSURE WILL CREST ACROSS THE REGION TODAY.
1122 PM CST MON FEB 23 2015 A PACIFIC COLD FRONT WILL SURGE SOUTHEAST THROUGH THE REGION TONIGHT. THE WIND WILL KEEP THE LOWER ATMOSPHERE WELL MIXED.
There may be some lower CIG/VIS near sunrise with the potential for freezing fog to develop, but do not have enough confidence to place in the TAFs. temps have budged little all day, and remain well blo freezing except areas far south. Plenty of black ice remains, temps are not anticipated to budge overnight, and w/accidents ongoing, we have opted to downgrade the warning to an advisory, and extended the advisories thru until 18Z Tuesday, after which temps will climb abv freezing.
IT CONTINUES A VERY SLOW BUT STEADY MOVEMENT SOUTHWARD WITH ITS FREEZING AXIS ALONG THE INTERSTATE 59 CORRIDOR. THE SURFACE FREEZING TEMPERATURES ARE ALSO SPORADIC BUT COME AS FAR SOUTH AS I-59.
ALTHOUGH TRAILING COLD FRONT AND ADVECTION WILL NOT REACH NRN IA UNTIL LATE IN THE AFTERNOON. FRM/MCW BUFR SOUNDINGS DEPICT MIXING TO JUST SHY OF 1KM AFTER INITIAL TROUGH PASSAGE. A FAIRLY WEAK HIGH PRESSURE RIDGE WILL SLIDE BY TO OUR NORTHEAST TONIGHT.
1111 PM EST MON FEB 23 2015 A LARGE AREA OF ARCTIC HIGH PRESSURE CENTERED OVER IOWA WILL CONTINUE TO INFLUENCE THE REGION AS IT MOVES TO THE LOWER OHIO VALLEY OVERNIGHT. THE HIGH WILL MOVE OFF THE EAST COAST TUESDAY AND ALLOW ANOTHER ARCTIC COLD FRONT TO MOVE THROUGH TUESDAY NIGHT.
1042 PM EDT Wed Oct 27 2021 The mid to upper-level trough that created unsettled weather this weekend and early this week slid east of the forecast area today. Ridging aloft and dry air mass inhibited shower development this afternoon and evening across the local waters and Keys. A negatively tilted trough plowing through the Gulf Coast with a trailing trough will bring a cool crisp air mass over the southeastern United states tomorrow and through the weekend. Guidance shows the trailing trough moving into the central Gulf late tonight.
524 PM MDT Wed Oct 27 2021 The upper trough continues to push eastward, taking its rain and clouds with it. Meanwhile, an upper ridge builds over the western CONUS. With limited impacts from gusty winds overnight, combined with the low to marginal likelihood of advisory-criteria wind as depicted by the ensembles, will forgo headlines.
Moisture wrapping around the Ozark cyclone will keep the Flint Hills and southeast Kansas cloudy with areas of rain continuing to pinwheel across these areas.
325 AM CDT Thu Oct 28 2021 Latest water vapor imagery shows a trough axis extending from the Dakotas southward into central Nebraska towards a closed low centered over the OK/AR border. Upstream, a large ridge extended across the western CONUS. At the surface, the region remains between high pressure building in from our west and low pressure centered over northern Arkansas with a tightening surface gradient between the two systems.
An amplified mid-upper level trough overhead now will move eastward and deepen further through tomorrow.
319 AM CDT Thu Oct 28 2021 A longwave trough is gradually making its way across the upper Mississippi valley. The trough brought precipitation to the western side of the Mississippi and will gradually move it eastward.
1046 PM CDT Wed Oct 27 2021 For tonight and Thursday, the longwave trough over the Plains will move slowly east. For tonight, the highest rain chances will be west of the Mississippi River. Low temperatures will fall into the upper 30s in central and north-central Wisconsin and be in the lower and mid-40s across the remainder of the area. The highest totals will be west of the Mississippi River and in southwest Wisconsin.
These above average temperatures will continue through the weekend as an upper-level ridge continues to build into the area. Temperatures will drop a couple degrees and return to normal as a result of this ridge deamplification.
254 AM MDT Thu Oct 28 2021 A deep, high amplitude trough is across the central CONUS at this time. The main trough axis is push through central SD.
258 AM MDT Thu Oct 28 2021 Upper ridging will bring dry and mostly quiet weather to the region during this period. Tonight, continued downsloping winds and increasing cloud cover will produce warmer conditions over south central MT, with low temperatures generally in the upper 30s to middle 40s. Southeast MT and Sheridan County, WY will be cooler with low temperatures in the 30s.
226 AM MDT Thu Oct 28 2021 The High Wind Warning for Interstate 80 between Laramie and Cheyenne has been cancelled due to winds dropping well below criteria. The High Wind Warning is being continued until 6 AM along Interstate 80 including Arlington and Elk Mountain due to gusts of 60 MPH remaining possible.
158 AM EDT Thu Oct 28 2021 Dry weather will continue tonight as high pressure moves east.
1106 PM MDT Wed Oct 27 2021 The upper trough continues to push eastward, taking its rain and clouds with it. Meanwhile, an upper ridge builds over the western CONUS. With limited impacts from gusty winds overnight, combined with the low to marginal likelihood of advisory-criteria wind as depicted by the ensembles, will forgo headlines.
Initial warm/moist advection band associated with comma tail of large upper cyclone moving through western GA as of this writing with no indication of any elevated convection or in-cloud lightning. PoPs continue quite high in north GA thru Fri Night with mid-level instability and very cold temps aloft associated with upper low and weak vort lobe rotating around large upper low.
Highs otherwise will rise into the lower 70s under full sun. Winds will drop off early the evening and it will be cooler in the lower to mid 40s across the region.
A low pressure system located over western AR and eastern OK will continue to push eastward tonight. Ahead of it, a cold front stretching along the MS/AL state line from the Gulf Coast northward towards the AL/TN state line. SFC obs show a warm front in southwest AL that has kept the warmer and more unstable airmass well to our south this evening. As the aformentioned low pressure system gets closer to the area later tonight, gradient winds increase considerably. The upper low will become stacked near or around the MO bootheel Thursday afternoon and evening.
We have seen since 07z an eastward clearing of the low clouds and despite light winds the clearing of fog as well. So full clearing eastward will take some time and clouds may hold in the far eastern fcst area thru tonight due to slow movement of 500 mb trough.
403 AM EDT Thu Oct 28 2021 Dry weather will continue this morning as high pressure moves off to the east.
1040 PM CDT Wed Oct 27 2021 Pronounced long wave trough currently running through the central US with a strung out meridional flow of persistent DPVA. As the trough axis shifts east into the evening hours, should also see this area of rain shift east as well, likely focused east of I-29 after midnight and confined to near a Storm Lake to Windom line by the daybreak hours Thursday.
Upper level ridging today will allow warming under less cloudy skies. On Fri night/Sat, there is still a splitting upper level trough that will leave behind a closed low in northern Californai and sweep through the extreme northern end of the forecast area. By Sat night, the closed low in California makes enough eastward progression that now the southern highlands and Wood River drainage area have a chance at some light precipitation. There is also not much in the way of significant wind during this period, in spite of the trough.
357 AM MDT Thu Oct 28 2021 A strong northwesterly jet is still evident across the region as an upper level ridge slowly builds in. Radar shows light returns in the high mountains indicating scattered snow showers persisting. An upper level ridge will push into the region today pushing the NW-SE jet max eastward. The upper level ridge will promote dry conditions across the area today. Model cross sections show moisture to stay in place over the higher terrain in the morning hours which should support chances for lingering light snow showers. Caution should be taken traveling early this morning, especially over the higher mountain passes where roads are snow covered or slick. Ridging aloft and mostly sunny skies will promote high temperatures near normal in the 50s/60s across the plains. Flat upper level ridge will slide east across the Central Rockies Friday.
The rain will slowly come to and end from west to east today as the upper trough moves off to the east and light southeasterly winds will go around to the north and become a bit breezy. The precipitation should be well east of the forecast area by Friday morning as ridging aloft builds in.
A closed low has developed at the base of the negatively tilted trough and has really slowed this feature significantly.