Aikyam-Lab/Synoptic-Bench huggingface dataset:
1237 AM EDT FRI MAR 20 2015 LOW PRESSURE WILL BRING A CHANCE FOR LIGHT RAIN PERHAPS MIXED WITH LIGHT SNOW LATE TO THE AREA TONIGHT. HIGHS ON FRIDAY WILL CLIMB INTO THE LOWER TO MIDDLE 50S. WEAK UPPER LEVEL SUPPORT WITH THIS NEXT SYSTEM COMBINED WITH DRY AIR IN THE LOW LEVELS SHOULD ALLOW LIMITED PRECIPITATION TO SPREAD NORTH ACROSS THE FORECAST AREA. WITH THE CHANCE FOR LIGHT FREEZING RAIN WHERE SURFACE TEMPERATURES FALL BELOW FREEZING. LOWERED WATER EQUIVALENT PRECIPITATION BY ABOUT ONE HALF GIVEN CHALLENGES SATURATING THE LOWEST LAYERS.
1145 PM CDT THU MAR 19 2015 WV IMAGERY THIS AFTN SHOWING AN ELONGATED POS TILT TROF EXTENDING FROM THE UPPER MIDWEST DOWN TO BAJA.
743 PM EDT THU MAR 19 2015 AVIATION A WEAKENING AREA OF LOW PRESSURE WILL TRACK UP THE OHIO VALLEY TONIGHT. A RIDGE OF HIGH PRESSURE ARRIVES FOR FRIDAY AND SUPPORTS MODERATING TEMPERATURES. A COLD FRONT PUSHES IN FROM THE NORTHWEST FRIDAY NIGHT POSSIBLY LEADING TO A FEW SHOWERS.
818 PM EDT THU MAR 19 2015 LOW PRESSURE WILL TRACK ACROSS THE MID ATLANTIC STATES AND BRING A LATE SEASON SNOWFALL TO THE AREA ON FRIDAY.
814 PM CDT THU MAR 19 2015 A TROUGH OF LOW PRESSURE CONTINUED TO CREATE AREAS OF VERY LIGHT RAIN AND POSSIBLY SOME LIGHT SNOW IN SPOTS.
740 PM EDT THU MAR 19 2015 A BROAD AREA OF LOW PRESSURE WILL MOVE THROUGH KENTUCKY TONIGHT.
/ISSUED 333 PM CST WED FEB 18 2015/ LARGE-SCALE UPPER TROF CONTINUES TO DOMINATE THE WEATHER PATTERN FOR OUR REGION AND MUCH OF THE ERN HALF OF THE U.
WINDS WILL GRADUALLY VEER AROUND TO THE EAST AND SE BY AFTN AND DIMINISH AS THE HIGH SLIDES EAST OF THE AREA. /ISSUED 339 PM CST WED FEB 18 2015/ HIGH PRESSURE THIS AFTERNOON RIDGING ACROSS THE FORECAST AREA WITH SUNNY SKIES. A REINFORCING COLD FRONT WILL MOVE ACROSS THE FORECAST AREA DURING THE LATE EVENING TO OVERNIGHT PERIOD. ANOTHER MILD DAY ON THURSDAY WITH HIGH PRESSURE IN CONTROL. THIS HIGH WILL MOVE OFF TO THE EAST BY THURSDAY NIGHT WITH LOW PRESSURE FORMING OVER WEST TEXAS.
948 PM EST WED FEB 18 2015 IT WILL BE VERY COLD BEHIND A STRONG COLD FRONT TONIGHT.
606 PM EST WED FEB 18 2015 IT WILL BE VERY COLD BEHIND A STRONG COLD FRONT TONIGHT.
Some breezy northerly winds will also occur with slightly cooler temperatures. Upper level ridge over NorCal as frontal system moves through the PacNW. Ridge flattens and retrogrades offshore over the next several days as vort maxes ride the top of it into the PacNW/Great Basin.
HAVE ADJUSTED THE LOWS OVER NORTH CENTRAL AREAS DOWN A FEW DEGREES TO ACCOUNT FOR THIS.
/ISSUED 432 PM EST WED FEB 18 2015/ HIGH PRESSURE IS SLOWLY BUILDING BEHIND A COLD FRONT THAT MOVED THROUGH EARLIER TODAY.
530 PM CST WED FEB 18 2015 HIGH PRESSURE OVER THE CENTRAL PLAINS WILL BUILD INTO THE AREA OVERNIGHT AND THURSDAY.
CHATTANOOGA AIRPORT, TN 11 20 13 32 / 10 0 10 50 KNOXVILLE MCGHEE TYSON AIRPORT, TN 8 15 9 30 / 20 10 0 30 OAK RIDGE, TN 7 16 8 30 / 20 10 10 30 TRI CITIES AIRPORT, TN 4 12 0 27 / 60 10 10 10 NC.
A RIDGE OVER THE WEST COAST WILL BRING DRY WEATHER AND ABOVE NORMAL TEMPERATURES TO NORTHWEST CALIFORNIA FOR THE NEXT FEW DAYS.
555 PM CST Wed Feb 18 2015 High pressure trying to build into the region on the heels of the exiting storm system. Visible satellite imagery already showing the diminishing cu field and have backed down the clouds accordingly, but not so much over the IN border, nearer to the trof axis. with a slightly warmer trof through the center of the state in the gap of the snow field. Morning upper air continues to show deep major trough over the central and eastern US. Deep arctic air to remain over the region rest of work week as deep upper level trough remains intrenched over eastern half of US.
308 PM MST WED FEB 18 2015 AFTER A COOLER START TO THE WEEK. IN THE BIG PICTURE THE WEST COAST RIDGE AXIS HAS SHIFTED INLAND NOW ORIENTED FROM EASTERN CALIFORNIA NORTHWARD TO EASTERN BRITISH COLUMBIA. THIS RIDGE GETS FLATTENED TONIGHT UNDER ENERGY OFF THE NORTHERN PACIFIC. COLDER AIR MOVES IN FROM THE NORTH AT 700 MB FRI AFTERNOON WITH THE TROUGH CROSSING THE AREA FRI NIGHT.
BITTER COLD TONIGHT AND A WINTER STORM LIKELY BY THE END OF THE ARCTIC HIGH PRESSURE IS BUILDING IN THE REGION. BITTER COLD TEMPS ARE EXPECTED AS HIGH PRESSURE MOVES DIRECTLY OVERHEAD AND SKIES REMAIN CLEAR. ARCTIC HIGH PRESSURE WILL REMAIN OVER THE AREA.
UPPER RIDGE FLATTENS AND TRANSITIONS TO A NORTHWEST FLOW THROUGH THURSDAY.
304 PM PST WED FEB 18 2015 HIGH PRESSURE WILL KEEP DRY CONDITIONS AND ABOVE NORMAL TEMPERATURES ACROSS THE REGION THROUGH THE WEEK.
956 PM EST WED FEB 18 2015 AN UPPER LEVEL TROUGH OF LOW PRESSURE WILL MOVE MOVE TOWARD THE NORTHEAST TODAY.
HIGH PRESSURE WILL KEEP DRY CONDITIONS AND ABOVE NORMAL TEMPERATURES ACROSS THE REGION THROUGH THE WEEK.
WITH WINDS NOT EXPECTED TO RELAX TONIGHT AND VERY COLD TEMPERATURES EXPECTED AS THE 1033-35MB RIDGE SLIDES INTO THE CENTRAL U. ANOTHER VERY COLD NIGHT IS EXPECTED FOR THURSDAY NIGHT AS THE RIDGE SLIDES INTO THE EASTERN U.
1043 PM EST WED FEB 18 2015 STRONG LOW-LEVEL COLD THERMAL ADVECTION HAS COMMENCED ACROSS THE ENTIRE SERVICE AREA IN WAKE OF A COLD FRONT WHICH TRAVERSED THE FLORIDA KEYS THIS MORNING. AND ON THE BRIDGES. AN ARCTIC ANTICYCLONE CURRENTLY CENTERED NEAR THE KANSAS/MISSOURI BORDER WILL BUILD AND EXPAND EASTWARD OVERNIGHT AND THURSDAY.
BUT SLOWLY RELAX OVER THE NEXT 12 HOURS AS HIGH PRESSURE SETTLE INTO THE AREA.
MUCH COLDER AIR ON ITS WAY WITH HARD FREEZE/FREEZE WARNINGS AND DRY COLD FRONT APPROACHING THE LOCAL AREA FROM THE NORTH NORTHWEST IS EXPECTED TO PASS THROUGH THE AREA BY THURSDAY MORNING WITH MUCH COLDER AIRMASS IN TOW. THE NEARSHORE WILL CONTINUE WITH THE SMALL CRAFT ADVISORY CONDITIONS THROUGH TOMORROW MORNING SUBSIDING TO EXERCISE CAUTION CRITERIA AS HIGH PRESSURE BUILDS IN OVER THE COASTAL WATERS.
900 PM MST WED FEB 18 2015 STRONG HIGH PRESSURE WILL REMAIN SITUATED OVER THE DESERT SOUTHWEST FOR THE REMAINDER OF THE WEEK. THE HIGH PRESSURE SYSTEM WILL EVENTUALLY BREAK DOWN OVER THE WEEKEND ALLOWING FOR SLIGHTLY COOLER TEMPERATURES. YET REMAINING WARMER THAN AVERAGE. WITH SUBFREEZING TEMPS FORECAST DOWN INTO PARTS OF INTERIOR SOUTH FLORIDA. ARE KEEPING OUR CWA UNDER STRONG RIDGING ALOFT THROUGH THE REST OF THE WORKWEEK. WITH 80 DEGREE HIGHS LIKELY TO RETURN TO THE WARMER LOWER DESERT LOCATIONS OF SOUTH-CENTRAL ARIZONA BY THURSDAY AFTERNOON. HIGH PRESSURE WILL BE THE DOMINATING WEATHER FEATURE TO CONTINUE THROUGH LATE THURSDAY.
A WEAK COLD FRONT OR SFC TROF IS PROJECTED TO MOVE ACROSS KGUY AND KDHT LATE THURSDAY AFTERNOON. TONIGHT AND THURSDAY DEEP UPPER TROUGH WAS CENTERED OVER ONTARIO TODAY AND IS RESPONSIBLE FOR THE BITTER COLD TEMPERATURES THAT HAS PLAGUED THE MIDWEST AND NORTHEAST U. HIGH AMPLITUDE UPPER RIDGE OVER THE WESTERN CONUS IS MAINTAINING DRY NORTHWEST UPPER FLOW OVER THE SOUTHERN PLAINS. SURFACE LEE SIDE TROUGHING WILL SET UP OVER THE WESTERN HIGH PLAINS THURSDAY.
715 PM EST WED FEB 18 2015 IT WILL BE VERY COLD BEHIND A STRONG COLD FRONT TONIGHT.
SKIES HAVE GONE MOSTLY CLEAR ACROSS MIDDLE TENNESSEE AND HIGH PRESSURE IS NOW MOVING INTO THE MID STATE WITH A CONSIDERABLY WEAKER PRESSURE GRADIENT IN PLACE. BUT SLOWLY RELAX OVER THE NEXT 12 HOURS AS HIGH PRESSURE SETTLE INTO THE AREA.
LEE TROUGHING DEVELOPS IN THE HIGH PLAINS THURSDAY.
STRONG HIGH PRESSURE WILL REMAIN SITUATED OVER THE DESERT SOUTHWEST FOR THE REMAINDER OF THE WEEK. THE HIGH PRESSURE SYSTEM WILL EVENTUALLY BREAK DOWN OVER THE WEEKEND ALLOWING FOR SLIGHTLY COOLER TEMPERATURES. YET REMAINING WARMER THAN AVERAGE. HIGH PRESSURE WILL BE THE DOMINATING WEATHER FEATURE TO CONTINUE THROUGH LATE THURSDAY.
HIGH PRESSURE WILL START TO WEAKEN ACROSS THE REGION ON THURSDAY.
709 PM CST WED FEB 18 2015 HIGH PRESSURE RIDGE AXIS IN CNTRL DAKOTAS EARLY THIS EVENING AND WILL MOVE EAST OVERNIGHT.
911 PM CST WED FEB 18 2015 WINDS CONTINUE TO DECOUPLE THIS EVENING AS HIGH PRESSURE BUILDS INTO WESTERN MINNESOTA.
922 PM CST WED FEB 18 2015 COLD FRONT APPROACHING FROM THE NORTH THIS EVENING. HIGH PRESSURE WILL SETTLE IN THE REGION QUICKLY BUT WILL MIGRATE OFF TO THE EAST TOMORROW. AN AREA OF LOW PRESSURE WILL DEVELOP OVER NORTH TEXAS/OKLAHOMA PHNDL AREA TOMORROW AND THIS DRAG MOISTURE OUT GULF AND ACROSS TEXAS. WINDS WILL GRADUALLY VEER AROUND TO THE EAST AND SE BY AFTN AND DIMINISH AS THE HIGH SLIDES EAST OF THE AREA. /ISSUED 339 PM CST WED FEB 18 2015/ HIGH PRESSURE THIS AFTERNOON RIDGING ACROSS THE FORECAST AREA WITH SUNNY SKIES. A REINFORCING COLD FRONT WILL MOVE ACROSS THE FORECAST AREA DURING THE LATE EVENING TO OVERNIGHT PERIOD. ANOTHER MILD DAY ON THURSDAY WITH HIGH PRESSURE IN CONTROL. THIS HIGH WILL MOVE OFF TO THE EAST BY THURSDAY NIGHT WITH LOW PRESSURE FORMING OVER WEST TEXAS.
A weak cold front over the area will shift eastward with surface winds becoming southerly, and gusty, especially by Thursday afternoon.
1047 AM CST MON FEB 23 2015 FREEZING LINE CURRENTLY ALONG THE INTERSTATE 20 CORRIDOR FROM JACKSONVILLE TEXAS TO MONROE LOUISIANA. AND A MIX OF SLEET/FREEZING RAIN/RAIN ELSEWHERE.
CHATTANOOGA AIRPORT, TN 40 25 45 26 / 10 30 40 10 KNOXVILLE MCGHEE TYSON AIRPORT, TN 33 24 40 26 / 50 50 60 20 OAK RIDGE, TN 34 23 40 25 / 20 30 40 10 TRI CITIES AIRPORT, TN 33 21 38 23 / 10 30 40 20.
FAR NORTHERN COUNTY TEMPERATURES WILL FALL TO OR SLIGHTLY BELOW FREEZING THIS EVENING. WITH THE FREEZING LINE MAKING IT TO JUST NORTH OF THE CITY SHORTLY AFTER MIDNIGHT.
/ISSUED 1056 AM CST MON FEB 23 2015/ CURRENT TEMPERATURES HOVERING AROUND FREEZING ACROSS THE NORTHWESTERN CWA. THIS OVERRUNNING SITUATION OF WARMER SOUTHWESTERLY FLOW OVER LOW LEVEL NORTHEAST FLOW PROMOTES DZ/-RA FALLING THROUGH A VERY SHALLOW NEAR/SUB- FREEZING NEAR SURFACE LAYER. THIS PRECIPITATION FALLING ONTO METAL OR ELEVATED ROADWAY SURFACES (BRIDGES/OVERPASSES) WILL FREEZE UPON CONTACT AND CREATE A FREEZING RAIN OR FREEZING DRIZZLE SITUATION BEGINNING FROM THE EARLY AFTERNOON HOURS AND LIKELY PERSISTING THROUGH THE PRE-DAWN TUESDAY MORNING HOURS. IN ALLOWING NON-GROUND SURFACES TO COOL TO BELOW FREEZING. THE FREEZING RAIN ADVISORY WILL COMMENCE AT NOON FOR THE EXTREME NORTHERN COUNTIES. FREEZING RAIN ADVISORY UNTIL 6 AM CST TUESDAY FOR THE FOLLOWING ZONES: BRAZOS. FREEZING RAIN ADVISORY FROM 6 PM THIS EVENING TO 6 AM CST TUESDAY FOR THE FOLLOWING ZONES: GRIMES.
115 PM EST MON FEB 23 2015 A COLD FRONT WILL STALL SOUTH OF THE REGION TODAY WITH AN AREA OF LOW PRESSURE MOVING ALONG IT. COLD HIGH PRESSURE WILL GRADUALLY BUILD IN FROM THE NORTH THROUGH TONIGHT.
955 AM PST MON FEB 23 2015 Cool high pressure will bring an abundance of sunshine and light winds to the Inland Northwest today.
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.
EXPECT GUSTY WINDS TODAY THEN MUCH COOLER TEMPERATURES WITH GUSTY WINDS AGAIN TUESDAY.
1233 PM EST MON FEB 23 2015 A COLD FRONT WILL BECOME NEARLY STATIONARY AND REMAIN NEAR THE SOUTHEAST COAST THROUGH MUCH OF THE WEEK. HIGH PRESSURE CENTERED TO THE NORTHWEST WILL DIRECT COLD AIR INTO THE AREA. SURFACE FRONT BACK DOORING THROUGH THE REGION AS COLD HIGH PRESSURE CENTERED OVER THE UPPER MISS VALLEY BUILDS EAST INTO THE MID ATLANTIC AND AS OFFSHORE SURFACE WAVE MOVES RAPIDLY NE. WITH SLEET OR FREEZING RAIN POSSIBLE FURTHER SOUTH EARLY TUESDAY MORNING. ACCUMULATIONS WOULD LIKELY BE LIGHT DUE TO WEAK ISENTROPIC LIFT AND LIMITED MOISTURE WITH THE HIGHEST AMOUNTS SOUTH AND EAST. THE GFS AND ECMWF KEEP THE FRONTAL SYSTEM NOT TOO FAR TO THE SOUTHEAST WITH A SERIES OF LOW PRESSURE SYSTEMS TRACKING ALONG THE BOUNDARY.
/ISSUED 1047 AM CST MON FEB 23 2015/ FREEZING LINE CURRENTLY ALONG THE INTERSTATE 20 CORRIDOR FROM JACKSONVILLE TEXAS TO MONROE LOUISIANA. AND A MIX OF SLEET/FREEZING RAIN/RAIN ELSEWHERE.
222 PM EST MON FEB 23 2015 A COLD FRONT WILL STALL SOUTH OF THE REGION TODAY WITH AN AREA OF LOW PRESSURE MOVING ALONG IT. COLD HIGH PRESSURE WILL GRADUALLY BUILD IN FROM THE NORTH THROUGH TONIGHT.
A RIDGE OF HIGH PRESSURE WILL BUILD SOUTHEAST ACROSS NEVADA OVER THE NEXT 24 HOURS.
WHILE AREAS OF NORTH MS SOUTH OF CLARKSDALE AND OXFORD SEE SOME LIGHT FREEZING RAIN MIXING IN WITH SLEET. ROADWAYS WILL LIKELY REMAIN DANGEROUS THIS MORNING AS THE RESULT OF OVERNIGHT FROZEN/FREEZING PRECIPITATION. FREEZING RAIN IS THE GREATEST CONCERN. WPC PROBABILISTIC GUIDANCE SUGGESTS AS HIGH AS A 40 PERCENT CHANCE OF GREATER THAN A HUNDREDTH OF AN INCH OF FREEZING RAIN IN OUR SOUTHERN MOST COUNTIES IN NORTH MISSISSIPPI AND EAST CENTRAL ARKANSAS. ALTHOUGH SLIGHTLY WARMER. TEMPERATURES TODAY MAY BARELY CLIMB ABOVE FREEZING IN EASTERN PORTIONS OF NORTH MISSISSIPPI. HIGHS SHOULD CLIMB ABOVE FREEZING.
249 PM CST Mon Feb 23 2015 1040+ mb Arctic ridge centered over eastern Missouri and western Illinois this afternoon. As the high continues to sink southeast towards the Ohio Valley by 12z, light north/west low level winds will back to southwest and strengthen towards daybreak, in response to low pressure tracking north of the Great Lakes. A strong area of low pressure will be pushing north of the Great Lakes on Tuesday bringing our area gusty southwest winds which should help to push afternoon temperatures into the low to mid 30s.
223 PM CST MON FEB 23 2015 LARGE SCALE FLOW PER SATL IMAGERY REVEALING AN UPSTREAM RIDGE SITUATED OFF THE WRN U. COASTLINE ALONG WITH A CUT OFF CLOSED LOW OVER THE CA/NV BORDER. COLD HIGH PRESSURE WAS DOMINATE FEATURE OVER THE CNTRL/ERN CONUS. A RELATIVELY WARM AIR MASS OVER THE LOWER TIER COUNTIES IN SERN NEB MAY PROVIDE A RA/SN MIX DURING THE AFTN HOURS. EXPECT GOOD MIXING ON TUES WILL ALLOW HIGH TO PUSH INTO THE U30S/LOW40S BEFORE THE DOWNWARD PLUNGE TAKES PLACE WHEN THE NEXT ARCTIC AIR MASS ENVELOPS THE CNTRL PLAINS CULMINATING IN THURS HIGHS STRUGGLING TO REACH THE LOW/MIN TEENS. WITH LARGE SCALE TROF REMAINING PLACE OVER THE CONUS.
WARMER TEMPERATURES AND GUSTY WINDS WILL CONTINUE THROUGH TOMORROW. A LOBE OF THE UPPER LEVEL POSITIVELY TILTED PACIFIC RIDGE STRETCHES OVER THE REGION. FORECAST TEMPERATURES REMAIN ON THE HIGH SIDE OF GUIDANCE. PROGGED MIX DOWN NUMBERS POINT TO WARMER TEMPS. BREAKING DOWN THE RIDGE.
242 PM MST MON FEB 23 2015 High pressure over the Northern Rockies will remain in-place through Tuesday.
Lows will be in the lower 40s for northwestern portions of the CWA and lower 50s for southeast portions of the CWA.
LOW LEVEL COLD AIR ADVECTION CONTINUES THIS MORNING WITH LATEST MSAS ANALYSIS SHOWING MODEST PRESSURE RISES FROM SOUTH CENTRAL TEXAS DOWN INTO THE LOWER RIO GRANDE VALLEY. 12Z DRT SOUNDING SHOWED A MODEST SUB-FREEZING LAYER UP TO AROUND 4KFT WITH COLDEST TEMPS AROUND 925 MBS. MODELS SHOW THIS SUB-FREEZING LAYER AROUND 925 MBS TO MOVE INTO THE BRUSH COUNTRY THIS AFTERNOON BUT IT WILL BE VERY SHALLOW. BUT STILL ABOVE FREEZING.
A LOW STRATUS DECK WILL LINGER OVER THE TERMINALS THROUGH THE ENTIRE FORECAST PERIOD AS WARMER AND MORE MOIST AIR OVERRUNS A COLD POOL OF AIR AT THE SURFACE. THERE WILL BE A RISK OF THE RAIN CHANGING OVER TO LIGHT FREEZING RAIN FOR A FEW HOURS AROUND 12Z TOMORROW AT KMCB. GIVEN THE LOW CHANCE. HAVE OPTED TO LEAVE THE MENTION OF FREEZING RAIN OUT OF THE KMCB TAF FOR NOW. FREEZING RAIN ADVISORY FROM 9 PM MONDAY TO 9 AM TUESDAY FOR THE FOLLOWING ZONES: EAST FELICIANA. FREEZING RAIN ADVISORY FROM 9 PM MONDAY TO 9 AM TUESDAY FOR THE FOLLOWING ZONES: AMITE.
ANOTHER COLD FRONT SWINGS THROUGH THE REGION TUESDAY NIGHT. THIS WILL LIKELY DECOUPLE THE LOWER BOUNDARY LAYER ALLOWING WINDS TO GO NEAR CALM. ALTHOUGH THE 00Z NAM HAS A NOTABLY FURTHER SOUTH H500 UPPER LOW THAN OTHER MODELS.
321 PM EST MON FEB 23 2015 A COLD FRONT CONTINUES TO SINK INTO NORTHERN FLORIDA AND ADJACENT WATERS AND WILL CONTINUE TO MOVE SOUTHWARD TONIGHT.
UPPER LEVEL LOW CONTINUES TO ROTATE OFF TO OUR SOUTHEAST WITH LIMITED INSTABILITY AND MOISTURE FORECAST TO BE ACROSS SAN BENITO AND INTERIOR MONTEREY COUNTY THROUGH THE DAY. NORTHERLY WINDS CONTINUE TO BE BREEZY WITH GUSTS OF 40 TO 50 MPH IN THE MOST EXPOSED LOCATIONS IN THE HIGHER ELEVATIONS ACROSS THE NORTH BAY AND EAST BAY. SHOWER ACTIVITY IS EXPECTED TO BE LESS WIDESPREAD TODAY WITH DRIER AIR WRAPPING AROUND THE WESTERN PERIPHERY OF THE UPPER LOW.
847 AM PST MON FEB 23 2015 LOW PRESSURE ALOFT WILL CONTINUE TO PRODUCE SCATTERED RAIN AND MOUNTAIN SNOW SHOWERS.
AHEAD OF THE APPROACHING COLD FRONT NOW DROPPING INTO NERN ND. BUT THINK THAT OVERALL THE HIGH WILL BE JUST AFTER MIDNIGHT AND TEMPS WILL STRUGGLE IN THE TEENS.
UPPER HEIGHT RISES WILL FOLLOW LEADING TO A MODERATE AMPLITUDE UPPER RIDGE TRANSLATING THROUGH EASTERN ZONES TUESDAY AFTERNOON. AN UPPER LOW OVER THE SAN JUAQUIN VALLEY AT THIS TIME WILL PULL EAST INTO THE SOUTHERN ROCKIES LATE TUESDAY. BUT AT LEAST SOME HIGH CLOUDS LOOK LIKELY TO REMAIN IN ADVANCE OF THAT APPROACHING UPPER LOW. BUT WE ARE LIKELY TO HOLD ONTO WESTERN EXTENSION OF THIS RIDGE ACROSS ROLLING PLAINS AT LEAST INTO TUESDAY. BUT HARD TO JUSTIFY CLIMBING MUCH ABOVE THAT RIGHT NOW GIVEN THE PERSISTENCE OF THE RIDGE AXIS JUST TO OUR EAST AND PERHAPS SOME HIGH CLOUDS.
THERE IS SOME INDICATION THAT SOME LIGHT FREEZING DRIZZLE MAY OCCUR THROUGH TONIGHT.
148 PM PST MON FEB 23 2015 LOW PRESSURE ALOFT WILL CONTINUE TO PRODUCE ISOLATED TO SCATTERED RAIN AND MOUNTAIN SNOW SHOWERS THROUGH THIS EVENING.
THE LATEST SURFACE OBS CLEARLY SHOW A LARGE RIDGE OF HIGH PRESSURE CONTINUE TO MOVE SOUTHEASTWARD OUT OF EAST CENTRAL PLAINS. AS THIS RIDGE MAKES ITS WAY ACROSS THE OHIO AND TENNESSEE VALLEY REGIONS. TEMPERATURES ACROSS THE AREA HAVE BEEN A FEW DEGREES WARMER. ANOTHER FACTOR THAT MAY KEEP TEMPERATURES SLIGHTLY WARMER TONIGHT IS THE PASSAGE OF A FAST MOVING AREA OF LOW PRESSURE. THESE CLOUDS WOULD ACT TO KEEP TEMPERATURES SLIGHTLY WARMER. AS SOUTHERLY WINDS BECOME ESTABLISHED IN THE ZONE BETWEEN THE AREA OF LOW PRESSURE MENTIONED BEFORE. AND A RIDGE OF HIGH PRESSURE THAT IS FORECAST TO CONTINUE DRIFTING SOUTHWARD INTO THE WESTERN GULF OF MEXICO.
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.
307 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.
CONUS MEAN TROUGH WILL REMAIN IN PLACE THROUGH THE WEEK. HOWEVER BY THE WEEKEND SW UPPER LEVEL FLOW WILL BECOME MORE PREVALENT WITH MORE EMPHASIS ON WRN CONUS TROUGH RATHER THEN RECENT CENTRAL/ERN AXIS. WARMER TEMPS WILL ALSO RESULT IN LOWER SNOW RATIOS HOWEVER AND MORE NON-DENDRITIC SNOW WITH THE MAX LIFT BELOW -12C.
331 PM CST MON FEB 23 2015 WARM ADVECTION HAS BEGAN WITH THE RETREAT OF ARCTIC HIGH PRESSURE AND WILL CONTINUE IN EARNEST OVERNIGHT WITH STRONG SOUTHWEST FLOW. TEMPERATURES WILL LIKELY BE AT THE LOWEST LEVELS THIS EVENING WITH INCREASING SOUTHWEST WINDS OVERNIGHT AS FLOW AT 2-3KFT INCREASES CLOSE TO 50KTS AFTER MIDNIGHT. THIS FLOW WILL BE STRONG ENOUGH TO KEEP SOME NEAR SURFACE MIXING GOING OVERNIGHT HELPING TEMPERATURES CLIMB AS THERMAL RIDGE APPROACHES THE STATE.
200 PM PST MON FEB 23 2015 AN UPPER LEVEL LOW OVER CALIFORNIA WILL BRING SCATTERED SHOWERS INTO THIS EVENING.
319 PM CST MON FEB 23 2015 CURRENT SURFACE ANALYSIS PLACES LOW OVER NORTHEAST MANITOBA WITH TROUGH DIPPING SOUTHWEST TOWARDS THE WESTERN DAKOTAS. COLD FRONT REMAINS TO THE NORTH OVER CENTRAL SASKATCHEWAN/MANITOBA. WHILE PACIFIC RIDGE NUDGES TOWARDS THE PACIFIC NORTHWEST. NOTABLY COOLER TEMPERATURES EXPECTED NORTH AND EAST. WITH AN INVERTED TROUGH EXTENDING NORTHWESTWARD INTO NORTH CENTRAL/EASTERN MONTANA.
AN UPPER RIDGE WILL KEEP THE WEATHER DRY TODAY. A WEAK UPPER TROUGH WILL BRING A RETURN TO ONSHORE FLOW ON TUESDAY.
245 PM CST Mon Feb 23 2015 High pressure moving across northern Missouri this afternoon was giving the Ozarks some sunshine. The area of high pressure will continue to control the region's weather through the overnight hours though some lingering high clouds will move over the area. This will occur in advance of an upper level trough that will begin to move across the plains during the day on Tuesday.
Lingering pockets of light snow and freezing drizzle continue across parts of the area, expected to taper off and shift east late this afternoon. /ISSUED 403 AM CST Mon Feb 23 2015/ Strong upper trough over CA/NV this morning will help produce another round of wintry precipitation across the area this morning as southwest flow aloft carries ample moisture over very cold air at the surface.
320 PM EST MON FEB 23 2015 ARCTIC HIGH PRESSURE BUILDING IN FOR TONIGHT. COLD FRONT TUESDAY NIGHT.
LOW PRESSURE WILL LINGER OVER THE REGION TODAY BEFORE MOVING EAST ON TUESDAY.
AND INTO THE LOWER TO MID 30S ELSEWHERE ACROSS THE FORECAST AREA. CIGS WILL RAISE SLIGHTLY TODAY AND THERE COULD BE A BRIEF BREAK IN THE LOWER CLOUDS TODAY AROUND 17-21Z BUT HAVE LOW CONFIDENCE IN THIS.
AN UPPER LEVEL LOW OVER CALIFORNIA COULD BRING PRECIPITATION INTO THIS EVENING WITH NEAR BELOW NORMAL TEMPERATURES.
428 PM EST MON FEB 23 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. HIGH PRESSURE OVER THE REGION WITH GENERALLY CLEAR SKIES WILL SET UP A HALFWAY DECENT NIGHT FOR RADIATIONAL COOLING OVER A STILL RELATIVELY FRESH SNOW PACK. WARM AIR WILL BE PULLED INTO THE REGION ON TUESDAY AHEAD OF THE COLD FRONT.
ESP IN LIGHT OF SIG SNOWPACK PRESENT ALG/NORTH OF THE HIGHWAY 6 CORRIDOR. THE MID-LATE WEEK PERIOD WILL FEATURE MAINLY DRY/COLD CONDITIONS AS POSITIVE PNA UPPER RIDGE ALONG THE WEST COAST HOLDS DEEP EASTERN CONUS TROUGHING IN PLACE. AND POSSIBLY A FEW SYNOPTIC FLURRIES/-SHSN WED NIGHT-THU AM WITH THE NEXT VORT LOBE/TROUGH DROPPING SE FROM CANADA. WITH SYSTEM STILL 6 DAYS OUT WILL KEEP ANY SLEET/FREEZING RAIN (TRANSITIONAL PTYPES) OUT OF THE FORECAST AND HOLD SHY OF LIKELY POPS GIVEN TIMING DIFFERENCES AND POTENTIAL FOR FRONTAL WAVE TO BE MORE SUPPRESSED THAN CURRENTLY MODELED. ARCTIC RIDGE WILL CONT EWD OVERNIGHT/TUE AHD OF NXT VIGOROUS NRN STREAM SW TROUGH AMPLIFYING THROUGH THE NRN LAKES.
1251 PM EST MON FEB 23 2015 A HIGH PRESSURE SYSTEM WILL SHIFT EAST ACROSS THE AREA THROUGH TUESDAY. A FEW SNOW SHOWERS WILL BE POSSIBLE TUESDAY NIGHT AS A COLD FRONT DROPS DOWN FROM THE NORTHWEST. SHORT WAVE ENERGY ROTATING ACROSS THE EASTERN GREAT LAKES ON TUESDAY WILL HELP DRIVE A COLD FRONT SOUTH ACROSS OUR AREA TUESDAY NIGHT.
A LOW PRESSURE SYSTEM WILL MOVE NORTH OF THE REGION TUESDAY. ESP IN LIGHT OF SIG SNOWPACK PRESENT ALG/NORTH OF THE HIGHWAY 6 CORRIDOR. THE MID-LATE WEEK PERIOD WILL FEATURE MAINLY DRY/COLD CONDITIONS AS POSITIVE PNA UPPER RIDGE ALONG THE WEST COAST HOLDS DEEP EASTERN CONUS TROUGHING IN PLACE. AND POSSIBLY A FEW SYNOPTIC FLURRIES/-SHSN WED NIGHT-THU AM WITH THE NEXT VORT LOBE/TROUGH DROPPING SE FROM CANADA. WITH SYSTEM STILL 6 DAYS OUT WILL KEEP ANY SLEET/FREEZING RAIN (TRANSITIONAL PTYPES) OUT OF THE FORECAST AND HOLD SHY OF LIKELY POPS GIVEN TIMING DIFFERENCES AND POTENTIAL FOR FRONTAL WAVE TO BE MORE SUPPRESSED THAN CURRENTLY MODELED. ARCTIC RIDGE WILL CONT EWD OVERNIGHT/TUE AHD OF NXT VIGOROUS NRN STREAM SW TROUGH AMPLIFYING THROUGH THE NRN LAKES.
1015 AM MST MON FEB 23 2015 A LOW PRESSURE SYSTEM WILL AFFECT ARIZONA THROUGH TONIGHT WITH RAIN AND HIGH ELEVATION SNOW.
MODERATE SOUTHWESTERLY WINDS IN THE LATE AFTERNOON WILL STEADILY GIVE WAY TO A WEST NORTHWEST FLOW THROUGH THE EVENING HOURS AS A COLD FRONTAL BAND DROPS THROUGH THE AREA.
1107 AM EST MON FEB 23 2015 A HIGH PRESSURE SYSTEM WILL SHIFT EAST ACROSS THE AREA THROUGH TUESDAY. A FEW SNOW SHOWERS WILL BE POSSIBLE TUESDAY NIGHT AS A COLD FRONT DROPS DOWN FROM THE NORTHWEST. SHORT WAVE ENERGY ROTATING ACROSS THE EASTERN GREAT LAKES ON TUESDAY WILL HELP DRIVE A COLD FRONT SOUTH ACROSS OUR AREA TUESDAY NIGHT.
SLEET ENDS THIS AFTERNOON IN METROPLEX AND SOME POTENTIAL FOR LIGHT FREEZING DRIZZLE CONTINUES OVERNIGHT.