Aikyam-Lab/Synoptic-Bench huggingface dataset:
207 AM EST SUN NOV 1 2015 ALOFT - TROUGHING EXTENDED FROM NORTH OF THE GREAT LAKES TO A CLOSED LOW IN THE SOUTHERN PLAINS. A RIDGE DOMINATED FL AND THE ADJACENT WATERS. A SECOND LOW ON THE TX/LA BORDER TRAILED A COLD FRONT SOUTH OVER THE THE GULF AND HAD A WARM FRONT STRETCHED EAST THROUGH THE GULF COASTAL STATES. HIGH PRESSURE OFF THE CANADAIN MARITIMES RIDGED ALONG THE EASTERN SEABOARD AND ACROSS FL INTO THE GULF. THE SOUTHERN PLAINS UPPER LOW TRACKS NORTHEASTWARD AND BECOMES AN OPEN TROUGH OVER THE OHIO VALLEY. FLATTENING THE UPPER RIDGE SOME AND NUDGING IT SOUTHWARD DOWN FL. THE LOW AND FRONT TO THE WEST ALONG WITH THE RIDGING FROM THE EAST WILL PROVIDE A PREVAILING LOW LEVEL SOUTHEASTERLY BECOMING SOUTHERLY AND SOUTHWESTERLY FLOW. WITH THE HIGHEST ODDS ON THE GULF.
AN UPPER LOW OVER TX WILL MOVE ENE THROUGH MONDAY.
1235 AM EDT SUN NOV 1 2015 AFTER A TROUGH OF LOW PRESSURE BRINGS SHOWERS THROUGH EARLY THIS MORNING. DRY CONDITIONS WILL BE IN PLACE AREA WIDE BY LATE MONDAY EVENING AS HIGH PRESSURE TAKES CONTROL.
331 AM EST SUN NOV 1 2015 AN UPPER LEVEL TROUGH MOVING ALONG THE CANADIAN BORDER WILL GENERATE AREAS OF LIGHT RAIN MAINLY THIS MORNING. HIGH PRESSURE WILL RETURN MONDAY LEADING TO DRY CONDITIONS WITH ABOVE NORMAL TEMPERATURES DURING THE NEXT 5 TO 7 DAYS. 500 MB TROUGH MOVING WEST TO EAST IN ZONAL FLOW ALONG THE CANADIAN BORDER. SOUTHERLY LOW LEVEL WINDS AHEAD OF THE TROUGH SHIFT TO SOUTHWEST AS IT PASSES. HIGH PRESSURE THE MAIN FEATURE IN THIS SHORT TERM PERIOD.
WV imagery shows West Texas and Southeast New Mexico on the backside of an upper trough moving thru Central Texas. Meridional flow aloft will quickly transition to SW over the next 48 hours as the next trough digs down the west coast. This will result in well-abv normal temperatures over the next few days, peaking Monday before thicknesses begin dropping w/the approach of the trough. Forecast soundings and H85 temp fields suggest MOS is too aggressive in warming things back up, and we've stayed conservative toward the cooler end of things in the short term. Return flow resumes by 06Z Monday as leeside troughing begins developing in advance of the trough.
Temps will generally stay in the low and mid 50s under heavy cloud cover before sunrise. The northern third, has a shot at seeing some sun and slightly warmer temps by afternoon. Highs Monday should top out in the low 70s north and the upper 60s south and east under heavier cloud cover and a continued cool light NE surface flow.
330 AM EST SUN NOV 1 2015 HIGH PRESSURE WILL BRING DRY AND MOSTLY SUNNY CONDITIONS TODAY. HIGH TEMPERATURES WILL BE IN THE LOW TO MID 60S WITH LOWS TONIGHT IN THE LOW TO MID 40S.
103 AM EDT SUN NOV 1 2015 AN UPPER LEVEL TROUGH MOVING EASTWARD FROM THE GREAT LAKES REGION WILL BRING INCREASING AND LOWERING CLOUD COVER OVERNIGHT. BEHIND THE UPPER TROUGH. HIGH PRESSURE WILL RETURN MONDAY LEADING TO DRY CONDITIONS WITH ABOVE NORMAL TEMPERATURES DURING THE NEXT 5 TO 7 DAYS. MID TO UPPER LEVEL CLOUD DECK ALREADY IN PLACE ACROSS THE NORTH COUNTRY THIS EVENING IN ADVANCE OF MAIN 700MB TROUGH AXIS ACROSS THE CENTRAL GREAT LAKES REGION. WITH THIS TROUGH APPROACHING AND SFC ANTICYCLONE DEPARTING EWD THRU THE GULF OF MAINE. ESPECIALLY ACROSS THE HIGHER TERRAIN AND IN THE CHAMPLAIN VALLEY. EVEN AS MAIN TROUGH AXIS AND LOW-LEVEL WAA MOVES EAST OF OUR REGION SUNDAY AFTN.
THE GRADIENT WILL BEGIN TO RELAX SUNDAY AFTERNOON AND EVENING AS A COLD FRONT APPROACHES FROM THE NORTH. THE ONGOING SAGA OF THE WESTERN CONUS TROUGH CONTINUES TODAY WITH SOME MODEL DIFFERENCES WITH THE TIMING.
250 AM EST SUN NOV 1 2015 AFTER A TROUGH OF LOW PRESSURE BRINGS SHOWERS EARLY THIS MORNING. HIGH PRESSURE IS PROGGED TO BUILD AND PERSIST ACROSS THE NE CONUS THROUGH MID WEEK BRINGING MAINLY DRY AND WARM WEATHER.
THERE MAY BE A BRIEF LULL IN THE ACTION LATER ON TONIGHT AS WE WAIT FOR THE UPPER TROUGH AXIS TO SWING WESTWARD. AS AN UPPER RIDGE BUILDS ACROSS THE NORTHERN GULF INTO THE NORTHEAST STATES.
THEN AS LOW PRESSURE APPROACHES FROM THE SOUTHWEST THIS EVENING. HIGH PRESSURE EAST OF THE MOUNTAINS IS INDUCING A MODERATE PRESSURE GRADIENT NOW. BUT MODELS SHOW THE PRESSURE RIDGE ON THAT SIDE OF THE MOUNTAINS RELAXING QUICKLY THIS MORNING.
358 AM EST SUN NOV 1 2015 HIGH PRESSURE WILL BUILD ACROSS THE REGION TODAY AND CONTINUE TO EXTEND OVER THE AREA INTO THE LATTER PART OF THE WEEK.
1146 PM CDT SAT OCT 31 2015 Clearing line is co-located with 500 mb trough axis this afternoon over eastern Kansas. Should see fairly rapid clearing from west to east through the evening across the forecast area as the trough continues eastward progress toward the Ohio Valley. An upper level low pressure system will pass on by to the south of the region on Sunday.
330 AM CST SUN NOV 1 2015 AN AREA OF LOW PRESSURE. THE UPPER LEVEL FLOW PATTERN WILL BEGIN CHANGING ON MONDAY AS A DEEP TROUGH DEVELOPS ALONG THE WEST COAST. STRONG/DEEP TROF OVER THE WESTERN CONUS WILL GRADUALLY LIFT E/NE DURING THE PERIOD WITH THE NORTHERN PLAINS EXPECTED TO BE AFFECTED BY A COUPLE DIFFERENT WAVES.
A WEAK RIDGE OF HIGH PRESSURE WILL TRACK ACROSS THE REGION TONIGHT. THEN ANOTHER TROUGH WILL PUSH ACROSS THE NORTHERN PLAINS ON SUNDAY. AS THIS TROUGH SLIDES EAST ON MONDAY. LOW PRESSURE WILL STRENGTHEN OVER COLORADO/WESTERN NEBRASKA AND LOOKS TO SPREAD PRECIPITATION OVER PARTS OF WESTERN SOUTH DAKOTA THEN INTO NORTH DAKOTA MONDAY NIGHT. SLIGHTLY COOLER AIR BEGINS TO MOVE IN MONDAY. NOT MUCH CHANGE BETWEEN 00Z AND 12Z DETERMINISTIC GUIDANCE WITHIN THE EXTENDED AS A LONGWAVE TROF SETS UP TO OUR WEST. BUT COOLER TEMPERATURES WILL DEFINE THE REST OF THE WORK WEEK.
COLD FRONT EXPECTED TO SWEEP THROUGH THE AREA LATE.
DUE TO THE PERSISTENT RIDGE TO OUR NORTH. DUE TO A RIDGE STRETCHING ACROSS FLORIDA.
A COLD FRONT EXTENDED FROM NORTHEASTERN ILLINOIS THROUGH NORTHWESTERN MISSOURI TO CENTRAL COLORADO. 58 /ISSUED 651 PM CDT THU SEP 10 2015/ CONVECTION ACROSS SOUTHERN PORTIONS OF THE REGION IS OCCURRING SOUTH OF AN OLD FRONTAL BOUNDARY IN THE VICINITY OF A WEAK MID LEVEL TROUGH AXIS. ANOTHER COLD FRONT CURRENTLY PUSHING SOUTH THROUGH KANSAS WILL MAKE ITS WAY INTO NORTH TEXAS ON FRIDAY. AFTERNOON SURFACE ANALYSIS REVEALED A COLD FRONT EXTENDING FROM THE GREAT LAKES. THE DEEPENING MID LEVEL TROUGH ACROSS THE EASTERN HALF OF THE U. SCATTERED SHOWERS AND THUNDERSTORMS WILL ACCOMPANY THE COLD FRONT MAINLY FRIDAY AFTERNOON/EVENING. COOLER AND STABLE AIR MOVES IN BEHIND THE FRONT.
1114 PM EDT THU SEP 10 2015 A NARROW RIDGE OF HIGH PRESSURE WILL BUILD INTO THE REGION FRIDAY.
CANADIAN HIGH PRESSURE WILL SETTLE IN OVER THE REGION TONIGHT BRINGING LIGHT WINDS AND CHILLY TEMPERATURES.
A STRONGER COLD FRONT WILL ARRIVE INTO THE AREA TOWARD THE END OF THE TAF PERIOD.
GIVEN COOLER TEMPERATURES ALOFT ANY STORMS WHICH DO DEVELOP WILL HAVE POTENTIAL FOR SEVERE HAIL OR WIND. BEHIND BOUNDARY MUCH COOLER TEMPERATURES WILL PUSH SOUTH. CURRENT NRN CONUS MEAN TROUGH WILL CONTINUE TO AMPLIFY EVENTUALLY CLOSING OFF OR NEARLY CLOSING AS IT REACHES THE ERN GREAT LAKES/OH VALLEY. BIGGEST STORY THROUGH THE WEEKEND WILL BE A COOLER DRIER AIRMASS WITH HIGH PRESSURE CROSSING IA SAT. MINS MAY DIP JUST INTO THE UPPER 30S SAT MORNING NORTH AND WEST CLOSER TO THE RIDGE. RIDGE BUILDS FROM THE ROCKIES INTO THE NRN PLAINS BY SUN WITH RETURN FLOW STARTING. PATTERN CHANGE WILL THEN COMMENCE WITH WRN CONUS TROUGH MATURING.
An upper level trough located across eastern MT and western SD will dig southeast across the central plains Tonight. At the surface a cold front extended from western IA. The mesoscale models show a cluster of storms developing across west central NE as the H5 trough approaches. Ascent ahead of the upper trough and isentropic lift north of the boundary will keep the chance for rain and elevated thunderstorms into the early morning hours of Friday. Any morning showers across the southeast counties of the CWA will move southeast into southwest MO by the mid morning hours, as the upper trough digs southeast into the mid MS river valley. Friday will be cooler with northeast winds of 10 to 20 MPH and gusts to 25 MPH during the late morning and afternoon hours. Highs will be cooler with lower to mid 70s.
1150 PM EDT THU SEP 10 2015 A TROUGH OF LOW PRESSURE WILL LINGER ACROSS THE AREA THROUGH FRIDAY.
THE DEVELOPMENT AND EVOLUTION OF CONVECTION THIS EVENING AND INTO THE OVERNIGHT HOURS AS A COLD FRONT DROPS SOUTH ACROSS THE REGION REMAINS THE MAIN FORECAST CONCERN.
Thunderstorm complex over Kansas this evening is still on track to move into portions of northeast Oklahoma and northwest Arkansas around midnight as the strong cold front continues its southward push toward the area. For the 0Z TAFs, a cold front will traverse the area overnight, bringing thunderstorms to all sites. /ISSUED 355 PM CDT THU SEP 10 2015/ A cold front will move south across the area late tonight and Friday morning accompanied by scattered to numerous showers and thunderstorms. Much cooler and drier air will move into the area for the weekend bringing our first taste of fall.
HIGH PRESSURE ALOFT WILL GRADUALLY BUILD INTO THE AREA AND CLEAR OUT THE SCATTERED MID LEVEL CLOUDINESS CURRENTLY OVER NORTH CENTRAL MONTANA BY 12Z.
EARLY THIS EVENING, DRIER AIR WAS PUSHING IN FROM THE NORTHWEST, FOLLOWING THE PASSAGE OF A COLD FRONT.
1216 AM EDT FRI SEP 11 2015 RAIN CHANCES WILL INCREASE AGAIN LATER TODAY AS A COLD FRONT MOVES OUT OF THE MIDWEST. RAIN CHANCES WILL INCREASE LATER THIS AFTERNOON AS A DEEPENING UPPER TROUGH PUSHES A FRONT OUT OF THE MIDWEST.
WV IMAGERY SHOWING BROAD TROFFING ACROSS THE ERN 3/4THS OF THE CONUS. WITH TROF CENTER LOCATED OVR SRN HUDSON BAY. EXPANDING/AMPLIFYING RIDGE OVR THE WRN QUARTER OF THE CONUS. WITH A WEAK COLD FRONT STRETCHING FROM SERN WY TO NCNTRL WY AND INTO CNTRL MT. WINDS ON FRIDAY WILL BE MUCH LIGHTER ACROSS THE ENTIRE FA BEHIND THE FRONT UNDER GENERAL HIGH PRESSURE AT THE SFC AND WEAKENING UPR LVL FLOW. AS THE CENTER OF THE RIDGE EXPANDS AND APPROACHES THE CWA FROM OUT OF THE GREAT BASIN. UPR LVL FLOW CONTINUES TO BECOME MORE NRLY ORIENTED AND WEAKEN AS THE RIDGE BECOMES MORE AMPLIFIED AND THE CNTR/AXIS TRANSLATES EWD FROM THE GREAT BASIN TOWARD WY. FRIDAY NIGHT THROUGH THURSDAY A LARGE HIGH PRESSURE RIDGE ALOFT OVER THE WEST WILL DOMINATE THE WEATHER WITH DRY AND WARMER CONDITIONS IN PLACE.
TROUGHING OVER THE OHIO VALLEY/EASTERN US AMPLIFIES. SHUNTING WHAT IS LEFT OF MID/UPPER LEVEL RIDGING TO OUR SOUTH AND EAST. IN THE LOWER LEVELS. COOLER TEMPERATURES ALOFT.
For the 0Z TAFs, a cold front will traverse the area overnight, bringing thunderstorms to all sites. /ISSUED 355 PM CDT THU SEP 10 2015/ A cold front will move south across the area late tonight and Friday morning accompanied by scattered to numerous showers and thunderstorms. Much cooler and drier air will move into the area for the weekend bringing our first taste of fall.
1022 PM EDT THU SEP 10 2015 A NARROW RIDGE OF HIGH PRESSURE WILL BUILD INTO THE REGION FRIDAY.
625 PM CDT THU SEP 10 2015 19z/2pm surface analysis shows a cold front extending from Lake Superior southwestward into eastern Iowa. Will highlight the I-74 corridor with the highest PoPs early this evening as the outflow boundary becomes active. After that, think additional scattered thunderstorms will develop along the actual cold front and track E/SE into the area from late evening into the overnight hours. Cold front is progged to pass through central Illinois tonight and will be pushing into Indiana by Friday morning. Will need to keep an eye on a deep upper low digging southward late in the day.
1040 PM MDT THU SEP 10 2015 FORECAST AREA CAUGHT IN BETWEEN RIDGE AXIS TO OUR WEST AND NORTHWEST FLOW ACROSS THE NORTHERN PLAINS. HIGH PRESSURE CONTINUES TO AMPLIFY ON FRIDAY AS THE REMNANTS OF TROPICAL STORM LINDA BECOME ENTRAINED IN THE CLOCKWISE FLOW OF THE HIGH PRESSURE AND APPROACH THE SOCAL COAST.
1032 PM EDT THU SEP 10 2015 HIGH PRESSURE WILL BRIEFLY SETTLE OVER THE AREA TONIGHT BEFORE ANOTHER COLD FRONT BRINGS A CHANCE OF RAIN ON FRIDAY. THIS FRONT WILL PROVIDE MUCH COOLER AIR FOR THE WEEKEND. HIGH PRESSURE WILL ALLOW FOR DRY CONDITIONS ACROSS THE AREA OVERNIGHT. H5 TROF WILL BE DIGGING INTO THE OHIO VALLEY AND DEEPENING.
1002 PM EDT THU SEP 10 2015 A TROUGH OF LOW PRESSURE WILL LINGER ACROSS THE AREA THROUGH FRIDAY.
Expect convection to continue to develop and congeal across eastern Kansas and eventually into west central Missouri through the evening along the advancing cold front. Focus in the short term will be with potential of a brief period of organized convection tonight as a strong cold front moves into the area. Aforementioned cold front was located well to the north of the area yet. A much cooler and drier air mass from what we have had over the past week will move into the area behind the front. A fairly deep upper level trough will be carved out over the eastern U.
/ISSUED 236 PM CDT THU SEP 10 2015/ THE MIDSOUTH WAS CURRENTLY IN AN AIRMASS SANDWICHED BETWEEN COLD FRONTS. APPROACHING COLD FRONT ACROSS THE PLAINS WILL SQUEEZE OUT THE REMAINING MOISTURE/65F+ DEWPOINTS OVER THE MIDSOUTH THROUGH THE PERIOD.
731 PM EDT THU SEP 10 2015 A WAVE OF LOW PRESSURE WILL TRACK SOUTHEAST OF PENNSYLVANIA BY TONIGHT. A NARROW RIDGE OF HIGH PRESSURE WILL BUILD INTO THE REGION FRIDAY.
DEWPOINTS ARE ALSO IN THE LOW 40S IN ALL BUT THE FAR WEST. FRINGES BECOMING MORE CELLULAR AND AS UPPER LOW SHIFTS EAST OVERNIGHT COMBINED WITH LOSS OF HEATING MODEL GUIDANCE SHOWING CLEARING ACROSS THE FA. THIS WILL ALLOW FOR SLIGHTLY WARMER TEMPERATURES AGAIN MAINLY ALONG AND WEST OF THE VALLEY.
00 UTC surface analysis shows a cold front across the Mid South and into the Southern Appalachians.
626 PM CDT THU SEP 10 2015 DATA ANALYSIS THIS AFTERNOON FEATURES A CLOSED UPPER LEVEL LOW OVER CENTRAL ONTARIO WITH A LARGE/BROAD TROUGH OF LOW PRESSURE EXTENDING SOUTHWARD THROUGH THE CENTRAL CONUS. MAY SEE A FEW MORE CLOUDS SPREADING IN ACROSS NORTHERN WI BY MORNING AHEAD OF ANOTHER EMBEDDED TROUGH WITHIN THE LONGWAVE TROUGH COMING OUT OF CANADA. COMBINED WITH CLOUD COVER EXPECTED TO YIELD SURFACE TEMPERATURES ONLY IN THE MIDDLE 50S TO THE LOWER 60S. THE REST OF THE AREA SHOULD BE SAFE BUT CHILLY NONETHELESS WITH LOWS IN THE LOWER/MID 40S. WITH RIDGE AXIS OVERHEAD AND DEEP LIGHT WINDS THROUGH THE BOUNDARY LAYER. BUILDING HEIGHTS TAKE PLACE THROUGH THE PERIOD AS A RIDGE OF HIGH PRESSURE BENDS INTO THE REGION FROM THE NORTHERN PLAINS.
A STRONGER LOW PRESSURE SYSTEM WILL SPREAD SHOWERS BACK INTO THE FORECAST AREA THIS WEEKEND. WEAK RIDGING WILL ALLOW FOR PARTY TO MOSTLY SUNNY SKIES ON FRIDAY, WITH PLEASANT HIGH TEMPERATURES IN THE MIDDLE 70S.
1159 PM CDT THU SEP 10 2015 FOR 06Z TAFS /ISSUED 301 PM CDT THU SEP 10 2015/ BROAD TROUGH EXISTS OVER THE NORTHERN PLAINS AND NORTHERN HALF OF THE CENTRAL US WHILE A RIDGE BUILDS OVER THE WEST COASTS OF US AND CANADA. 77 /ISSUED 934 PM CDT THU SEP 10 2015/ A COLD FRONT HAS PUSHED WELL TO THE SOUTHEAST OF THE AREA WITH A WEAK NORTHWEST FLOW IN ITS WAKE.
651 PM CDT THU SEP 10 2015 CONVECTION ACROSS SOUTHERN PORTIONS OF THE REGION IS OCCURRING SOUTH OF AN OLD FRONTAL BOUNDARY IN THE VICINITY OF A WEAK MID LEVEL TROUGH AXIS. ANOTHER COLD FRONT CURRENTLY PUSHING SOUTH THROUGH KANSAS WILL MAKE ITS WAY INTO NORTH TEXAS ON FRIDAY. AFTERNOON SURFACE ANALYSIS REVEALED A COLD FRONT EXTENDING FROM THE GREAT LAKES. THE DEEPENING MID LEVEL TROUGH ACROSS THE EASTERN HALF OF THE U. SCATTERED SHOWERS AND THUNDERSTORMS WILL ACCOMPANY THE COLD FRONT MAINLY FRIDAY AFTERNOON/EVENING. COOLER AND STABLE AIR MOVES IN BEHIND THE FRONT.
WEAK PRESSURE GRADIENT COMBINED WITH NUMEROUS MESOSCALE BOUNDARIES ACROSS THE REGION CAUSING DIFFICULTY IN INDENTIFYING TRUE COLD FRONT. HIGH PRESSURE TO SURGE SOUTH ON FRIDAY ALLOWING FOR COOLER AND DRIER AIR TO MOVE ACROSS THE REGION.
1131 PM CDT THU SEP 10 2015 A COLD FRONT IS CURRENTLY ACCOMPANIED BY A LINE OF THUNDERSTORMS AS IS PUSHES SOUTH INTO NORTHERN OKLAHOMA. TROUGH/ WILL INCREASE DURING THE AFTERNOON.
Light southeasterly winds overnight and Friday morning will back to the east Friday afternoon and increase ahead of a cold front which will begin to move through the area near/just beyond the end of the forecast period. /issued 222 PM CDT THU SEP 10 2015/ There is an upper trough that is centered over southern Canada that has began to deepen over the Upper Midwest today. Precipitation will once again be possible today across the higher terrain, Big Bend region, and the Lower Trans Pecos. On Friday, the previously mentioned upper trough will deepen even more and will send another cold front into the area Friday evening.
814 PM EDT THU SEP 10 2015 HIGH PRESSURE WILL BRIEFLY SETTLE OVER THE AREA TONIGHT BEFORE ANOTHER COLD FRONT BRINGS A CHANCE OF RAIN ON FRIDAY. THIS FRONT WILL PROVIDE MUCH COOLER AIR FOR THE WEEKEND. A NARROW AREA OF HIGH PRESSURE WILL CONTINUE TO DROP SOUTHEAST INTO THE AREA. LOWS TONIGHT SHOULD DROP DOWN TO THE MID 50S EAST OF COLUMBUS TO THE LOWER 60S IN PARTS OF THE TRI-STATE REGION. H5 TROF WILL BE DIGGING INTO THE OHIO VALLEY AND DEEPENING.
/ISSUED 301 PM CDT THU SEP 10 2015/ BROAD TROUGH EXISTS OVER THE NORTHERN PLAINS AND NORTHERN HALF OF THE CENTRAL US WHILE A RIDGE BUILDS OVER THE WEST COASTS OF US AND CANADA. 77 A COLD FRONT HAS PUSHED WELL TO THE SOUTHEAST OF THE AREA WITH A WEAK NORTHWEST FLOW IN ITS WAKE. LN /ISSUED 606 PM CDT THU SEP 10 2015/ WEAK NWLY SFC FLOW TONIGHT BEHIND A COLD FRONT WILL DIMINISH. ISOLD-SCT TSRA ARE EXPECTED IN ADVANCE OF AND ALONG AN APPROACHING COLD FRONT WHICH IS FORECAST TO ARRIVE DURING THE FRIDAY EVENING HOURS.
706 PM CDT THU SEP 10 2015 12Z UA ANALYSIS HAS AN 850MB COLD FRONT FROM EASTERN LAKE SUPERIOR INTO SOUTH DAKOTA. 18Z SFC DATA SUGGESTS THE COLD FRONT RAN FROM NEAR KGRB TO NEAR KSUX. DEW POINTS AHEAD OF THE COLD FRONT WERE IN THE 60S AND WERE IN THE 40S AND 50S BEHIND THE COLD FRONT. THE ADDITION OF THE COLD FRONT MOVING INTO THE AREA DURING PEAK HEATING MAY ALSO TRIGGER SOME ISOLATED TO SCATTERED CONVECTION. BRISK AND MUCH COOLER CONDITIONS WILL BE SEEN ACROSS THE AREA ON FRIDAY.
919 PM EDT THU SEP 10 2015 SHOWERS AND STORMS WERE MOVING EAST NORTHEAST TO THE WEST OF THE REGION AHEAD OF A COLD FRONT LOCATED ACROSS NORTH CENTRAL GEORGIA.
610 PM MDT THU SEP 10 2015 FORECAST AREA CAUGHT IN BETWEEN RIDGE AXIS TO OUR WEST AND NORTHWEST FLOW ACROSS THE NORTHERN PLAINS. HIGH PRESSURE CONTINUES TO AMPLIFY ON FRIDAY AS THE REMNANTS OF TROPICAL STORM LINDA BECOME ENTRAINED IN THE CLOCKWISE FLOW OF THE HIGH PRESSURE AND APPROACH THE SOCAL COAST.
A cold front will move across KABI and KSJT Friday afternoon, shifting winds to the northeast. Friday, the next cold front will move through the area. Have kept highs in the lower to mid 90s for the most part, as the front will be moving through during the late morning and afternoon hours, allowing at least some heating to take place for cooler air makes its way into the region. 20 (Friday night through Thursday) A cold front will be located across the Concho Valley/Heartland late Friday afternoon and evening.
AN UPPER LEVEL RIDGE IS OVER THE PACIFIC NORTHWEST THIS EVENING.
MEANWHILE A RIDGE OF HIGH PRESSURE WILL DOMINATE THE AREAS WEATHER WITH DRY CONDITIONS INTO FRIDAY AND ABOVE NORMAL TEMPERATURES.
1147 PM CDT THU SEP 10 2015 DATA ANALYSIS THIS AFTERNOON FEATURES A CLOSED UPPER LEVEL LOW OVER CENTRAL ONTARIO WITH A LARGE/BROAD TROUGH OF LOW PRESSURE EXTENDING SOUTHWARD THROUGH THE CENTRAL CONUS. MAY SEE A FEW MORE CLOUDS SPREADING IN ACROSS NORTHERN WI BY MORNING AHEAD OF ANOTHER EMBEDDED TROUGH WITHIN THE LONGWAVE TROUGH COMING OUT OF CANADA. COMBINED WITH CLOUD COVER EXPECTED TO YIELD SURFACE TEMPERATURES ONLY IN THE MIDDLE 50S TO THE LOWER 60S. THE REST OF THE AREA SHOULD BE SAFE BUT CHILLY NONETHELESS WITH LOWS IN THE LOWER/MID 40S. WITH RIDGE AXIS OVERHEAD AND DEEP LIGHT WINDS THROUGH THE BOUNDARY LAYER. BUILDING HEIGHTS TAKE PLACE THROUGH THE PERIOD AS A RIDGE OF HIGH PRESSURE BENDS INTO THE REGION FROM THE NORTHERN PLAINS.
ADDITIONAL SHOWERS AND STORMS WILL BE POSSIBLE TOMORROW AHEAD OF ANOTHER COLD FRONT. COLD FRONT. IMPRESSIVE MID LEVEL TROF DIGGING OVER THE MS VALLEY TONIGHT WILL PUSH A STRONG COLD FRONT INTO THE AREA BY FRIDAY AFTERNOON. INCOMING COLD FRONT SHOULD BE CLOSE ENOUGH BY MID/LATE AFTERNOON TO FIRE OFF A GOOD SCATTERING OF SHOWERS AND A FEW THUNDERSTORMS OVER THE NORTH.
A WEAK UPPER LEVEL TROF WILL PUSH TO THE EAST OF ALABAMA TONIGHT AND WILL BE THE PRIMARY FOCUS FOR EVENING SHOWERS AND THUNDERSTORMS. A WEAK SURFACE FRONT NEAR THE I-20 CORRIDOR THIS AFTERNOON WILL PUSH SLOWLY SOUTHEAST OVERNIGHT AS THE UPPER TROF AXIS MOVES OUT OF THE AREA. AND ACROSS NORTHWEST ALABAMA AS A STRONGER SHORT WAVE TROF APPROACHES FROM THE NORTHWEST.
/ISSUED 420 PM EDT THU SEP 10 2015/ HIGH PRESSURE REMAINS IN CONTROL ACROSS THE REGION WITH THE 12Z SOUNDING INDICATING THE 500 HPA TEMPERATURE UNSEASONABLY WARM WITH THIS AFTERNOONS CONVECTION STRUGGLING TO MAINTAIN ANY CONTINUITY. HIGH PRESSURE ACROSS THE FLORIDA PENINSULA AND THE ADJACENT WATERS WILL SLOWLY START TO ERODE TONIGHT INTO FRIDAY AS A COLD FRONT CONTINUES TO MOVE INTO THE SOUTHEASTERN STATES AND A LARGE AMPLITUDE MID TO UPPER LEVEL TROUGH DIGS INTO THE EASTERN CONUS DURING THIS PERIOD.
738 PM EDT THU SEP 10 2015 A TROUGH OF LOW PRESSURE WILL LINGER ACROSS THE AREA THROUGH FRIDAY.
MOISTURE WILL CONTINUE TO POOL ACROSS SOUTHERN TEXAS WELL SOUTH OF A COLD FRONT LOCATED IN CENTRAL TEXAS. MORE ACTIVE WEATHER PATTERN SETTING UP FOR THE SHORT TERM AS THE FIRST AUTUMN COLD FRONT MOVES THROUGH TEXAS.
SURFACE COLD FRONT MOVING INTO NORTHEAST COLORADO THIS AFTERNOON AND WILL HAVE PUSHED ACROSS MUCH OF THE PLAINS BY LATER THIS EVENING. STRATUS DECK WILL GRADUALLY ERODE DURING THE LATE MORNING AND AFTERNOON WITH MUCH COOLER TEMPERATURES EXPECTED.
A STRONGER LOW PRESSURE SYSTEM WILL SPREAD SHOWERS BACK INTO THE FORECAST AREA THIS WEEKEND. THIS WILL CONTINUE TO WIND DOWN WEST TO EAST INTO THE FIRST PART OF THE OVERNIGHT AS LOW PRESSURE TRACKS NORTH AND EAST. WEAK RIDGING WILL ALLOW FOR PARTY TO MOSTLY SUNNY SKIES ON FRIDAY, WITH PLEASANT HIGH TEMPERATURES IN THE MIDDLE 70S.
CHATTANOOGA AIRPORT, TN 67 85 64 75 / 20 20 40 40 KNOXVILLE MCGHEE TYSON AIRPORT, TN 66 83 62 74 / 30 20 50 50 OAK RIDGE, TN 66 84 62 74 / 30 20 50 50 TRI CITIES AIRPORT, TN 64 81 60 71 / 40 20 60 60.
741 PM EDT THU SEP 10 2015 A TROUGH OF LOW PRESSURE WILL LINGER ACROSS THE AREA THROUGH FRIDAY.
1151 PM CDT THU SEP 10 2015 12Z UA ANALYSIS HAS AN 850MB COLD FRONT FROM EASTERN LAKE SUPERIOR INTO SOUTH DAKOTA. 18Z SFC DATA SUGGESTS THE COLD FRONT RAN FROM NEAR KGRB TO NEAR KSUX. DEW POINTS AHEAD OF THE COLD FRONT WERE IN THE 60S AND WERE IN THE 40S AND 50S BEHIND THE COLD FRONT. THE ADDITION OF THE COLD FRONT MOVING INTO THE AREA DURING PEAK HEATING MAY ALSO TRIGGER SOME ISOLATED TO SCATTERED CONVECTION. BRISK AND MUCH COOLER CONDITIONS WILL BE SEEN ACROSS THE AREA ON FRIDAY.
606 PM CDT THU SEP 10 2015 FOR 00Z TAFS /ISSUED 301 PM CDT THU SEP 10 2015/ BROAD TROUGH EXISTS OVER THE NORTHERN PLAINS AND NORTHERN HALF OF THE CENTRAL US WHILE A RIDGE BUILDS OVER THE WEST COASTS OF US AND CANADA. 77 /ISSUED 301 PM CDT THU SEP 10 2015/ A WEAK AND ILL-DEFINED COLD FRONT IS CURRENTLY MOVING ACROSS THE TN VALLEY THIS AFTERNOON WITH THE PRIMARY IMPACT WITH THIS FRONT BEING ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS.
902 PM EDT THU SEP 10 2015 HIGH PRESSURE WILL BRIEFLY BUILD OVER THE MIDDLE ATLANTIC REGION LATE TONIGHT THROUGH FRIDAY.
WATER VAPOR IMAGERY DEPICTING WELL DEFINED UPPER LOW OVER NORTHERN ONTARIO WITH SHORT WAVE ROTATING AROUND THE BASE INTO THE GREAT LAKES REGION THIS AFTERNOON. KLOT RADAR SHOWING LINE OF SHOWERS AND THUNDERSTORMS AHEAD OF ASSOCIATED SURFACE COLD FRONT MOVING E/SE ACROSS NORTHERN ILLINOIS. A LEAD SHORT WAVE ASSOCIATED WITH LARGER SCALE AMPLIFYING UPPER TROUGH WILL BE PROGRESSING THROUGH THE SOUTHERN GREAT LAKES REGION FRIDAY EVENING.
830 PM EDT THU SEP 10 2015 SUBSIDENT DRY MID LEVEL AIR ASSOCIATED WITH DEEP LAYERED RIDGING OVER THE REGION AGAIN HELPED TO SUPPRESS CONVECTIVE DEVELOPMENT ALONG THE SEA BREEZE BOUNDARIES DURING THE AFTERNOON WITH ONLY A FEW SHOWERS AND STORMS BEING OBSERVED. BUT AS THE HIGH BEGINS TO WEAKEN AND SHIFT SOUTH LATER TONIGHT AS THE UPPER TROUGH TO THE NORTH AMPLIFIES. HIGH PRESSURE OVER THE GULF WILL MAINTAIN TRANQUIL BOATING CONDITIONS THE REMAINDER OF TONIGHT WITH LIGHT SOUTHWEST TO WEST WINDS AND SLIGHT SEAS.