Aikyam-Lab/Synoptic-Bench huggingface dataset:
HIGH PRESSURE OVER THE REGION WILL KEEP CONDITIONS DRY TONIGHT AND MUCH OF THE DAY TUESDAY. AN ELONGATED LOW PRESSURE SYSTEM LOOKS TO REACH THE WESTERN PLAINS BY TUESDAY NIGHT.
/ISSUED 336 PM CDT MON JUL 20 2015/ THE MAIN HEADLINE IF YOU WANT TO CALL IT THAT IS THE PERSISTENT UPPER LEVEL RIDGE. AGAIN DO NOT THINK COVERAGE WILL BE ALL THAT GREAT DUE TO THE RIDGING ALOFT WHICH SHOULD BE AROUND 592-593 DM AT 500MB. THE CENTER OF THE RIDGE DOES LOOK TO RETROGRADE BACK TO OVER W TX FOR THE COMING WEEKEND. 39 DESPITE THE UPPER RIDGE OF HIGH PRESSURE REMAINING ANCHORED OVER THE REGION.
923 PM EDT MON JUL 20 2015 SLIGHTLY LESS HUMID CONDITIONS ARE EXPECTED THROUGH TONIGHT BEHIND A WEAK COLD FRONT DROPPING SOUTH OF THE REGION. ANOTHER COLD FRONT WILL BRING ONE MORE DAY OF SCATTERED SHOWERS AND THUNDERSTORMS TO CENTRAL PENNSYLVANIA BEFORE DRY HIGH PRESSURE BUILDS FOR THE SECOND HALF OF THE WEEK.
627 PM CDT MON JUL 20 2015 COLD FRONT HAD PUSHED INTO THE FAR SOUTHEAST CORNER OF NEBRASKA AT 19Z WITH A CONTINUED DRIFT TO THE SOUTH EXPECTED THROUGH THE EVENING.
1149 PM EDT MON JUL 20 2015 SLIGHTLY LESS HUMID CONDITIONS ARE EXPECTED THROUGH TONIGHT BEHIND A WEAK COLD FRONT DROPPING SOUTH OF THE REGION. ANOTHER COLD FRONT WILL BRING ONE MORE DAY OF SCATTERED SHOWERS AND THUNDERSTORMS TO CENTRAL PENNSYLVANIA BEFORE DRY HIGH PRESSURE BUILDS FOR THE SECOND HALF OF THE WEEK. SHORT WAVE TROUGH MOVING THROUGH NRN OH AND WILL MOVE STEADILY THROUGH PA OVERNIGHT. A CLUSTER OF STORMS OVER ECENT OH JUST AHEAD OF THE TROUGH ARE ON TRACK TO MAKE IT INTO THE WESTERN MTNS AROUND 2 AM. LITTLE FORCING TO ORGANIZE ANYTHING AND LOSS OF SUN WILL LIKELY SUPPRESS FURTHER CONVECTION UNTIL THE DEEPER PART OF A SHORT WAVE TROUGH MOVES IN FROM THE UPPER GREAT LAKES LATE TONIGHT.
925 AND 850 MB TEMPERATURES ARE A BIT COOLER THAN THE PAST FEW DAYS. TROUGHING OVER THE EAST COAST WILL BEGIN TO SHARPEN. DEPENDING ON WHERE THE TROUGH AXIS SETS UP AND JUST HOW SHARP IT IS. THIS WOULD TYPICALLY LEAD TO BETTER RAIN CHANCES AS IMPULSES DIVE SOUTHWARD AROUND THE EASTERN PERIPHERY OF THE RIDGE. HIGH PRESSURE REMAINS IN CONTROL OF THE GULF OF MEXICO.
1139 PM CDT MON JUL 20 2015 COLD FRONT HAD PUSHED INTO THE FAR SOUTHEAST CORNER OF NEBRASKA AT 19Z WITH A CONTINUED DRIFT TO THE SOUTH EXPECTED THROUGH THE EVENING.
MUGGY NIGHT ACROSS MIDDLE TENNESSEE AS MID STATE REMAINS UNDER THE INFLUENCE OF UPPER LEVEL RIDGING AND SOUTH OF FRONTAL BOUNDARY DRAPED TO OUR NORTH FROM SOUTHERN MISSOURI UP ALONG THE OHIO RIVER.
THE STORM THREAT WILL COME TO AN END BY TUESDAY MORNING AND A WELCOME DRY RESPITE WILL OVERSPREAD THE AREA AS HIGH PRESSURE BUILDS INTO THE REGION. ADDITIONAL SCATTERED CONVECTION HAS DEVELOPED ALONG A COLD FRONT BACK ACROSS NORTHWEST ILLINOIS. CONTINUED TO GO WITH A DRY FORECAST BY TUESDAY MORNING AS HIGH PRESSURE WILL ALLOW FOR A DRY FORECAST THROUGH THE REMAINDER OF THE SHORT TERM PERIOD.
A COLD FRONT APPROACHES FROM THE WEST ON TUESDAY AND MOVES THROUGH TUESDAY EVENING. LOW PRESSURE OVER THE CANADIAN MARITIMES SLOWLY LIFTS NORTHEAST THROUGH THE END OF THE WEEK. WHILE HIGH PRESSURE BUILDS EAST FROM THE OHIO VALLEY AND GREAT LAKES STATES.
750 PM EDT MON JUL 20 2015 A COLD FRONT WILL ENTER THE AREA TUESDAY BEFORE CROSSING TUESDAY EVENING.
ALONG WITH THE OVERALL WEAKENING TREND OF THE PESKY MID/UPPER LEVEL RIDGE WEDGED INTO THE REGION FROM THE WEST.
823 PM EDT MON JUL 20 2015 TROUGHING ALOFT HELPING TO BRING IN PLENTY OF LOW-LEVEL MOISTURE AROUND 5KFT OVER UPR MICHIGAN THIS AFTN. SCT-BKN SC/CU HAS RESULTED AND WITH COLD FRONT WORKING ACROSS FAR SE-E CWA. APPEARS THAT SINCE THE HIGH PRESSURE RIDGE WILL REMAIN WEST OF UPPER GREAT LAKES. AS THE UPPER GREAT LAKES REGION WILL BE INCREASINGLY INFLUENCED BY AN UPPER RIDGE.
A COLD FRONT WILL MOVE SOUTHEAST THROUGH THE REGION ON TUESDAY. WITH DRIER AND SLIGHTLY COOLER CONDITIONS EXPECTED THROUGH THE MIDDLE OF THE WEEK. THOUGH NONE OF THE HIGH-RES GUIDANCE (12Z SPC-WRF OR RECENT HRRR RUNS) INDICATE THAT DEVELOPMENT WILL BE PARTICULARLY EXPLOSIVE. AS THE APPROACHING COLD FRONT WILL STILL BE NORTH OF THE FORECAST AREA. A COLD FRONT WILL BE MOVING ACROSS THE MICHIGAN BORDER. THIS FRONT DELINEATES THE LEADING EDGE OF A SLIGHTLY COOLER AND SIGNIFICANTLY DRIER AIR MASS.
COLD FRONT MOVING THROUGH THE REGION FIRING OFF THUNDERSTORMS THIS AFTERNOON. COLD FRONT CLEARS THE SOUTHEAST BY 02Z THIS EVENING WITH CLEARING BEHIND. THIS WILL LEAD TO A BIT COOLER AND LESS HUMID CONDITIONS TUESDAY FOLLOWED BY SLOWLY WARMING TEMPERATURES FOR THE REMAINDER OF THIS PERIOD.
TONIGHT AND TUESDAY COLD FRONT CONTINUES TO PUSH THROUGH THE AREA EARLY THIS AFTERNOON. AN AREA OF CLOUDS WILL TRAIL THE COLD FRONT AND SPREAD ACROSS THE AREA THIS AFTERNOON AND EARLY EVENING. DRY AND VERY PLEASANT CONDITIONS ARE EXPECTED ON TUESDAY AS THE HIGH PRESSURE SYSTEM PUSHES OVER THE WESTERN GREAT LAKES.
A LONGWAVE TROF AXIS CENTERED OVER EASTERN CANADA HAD SPREAD SOUTHEASTWARD THROUGH THE PLAINS/MIDWEST PUSHING A SURFACE FRONTAL BOUNDARY SOUTH INTO THE OKLAHOMA TEXAS PANHANDLES. SCATTERED SHOWERS AND THUNDERSTORMS TO THE WEST AND NORTH ARE FOERCAST TO MOVE INTO THE CWA DURING THE NIGHT IN RESPONSE TO THE SURFACE BOUNDARY HOLDING OVER THE REGION AND A MORE DEFINED COLD FRONT ASSOCIATED WITH THE LONGWAVE APPROACHES FROM THE NORTH. MOSTLY CLOUDY SKIES AND TEMPS GETTING DOWN NEAR THE LOWS OVER THE PAST FEW DAYS SHOULD BE COMMON BY TUESDAY MORNING. THE COLD FRONT TO THE NORTH LOOKS TO MOVE INTO THE REGION TUESDAY WITH CONTINUED PRECIP CHANCES AND SHOULD GIVE A BREAK TO THE HOT TEMPERATURES.
928 PM EDT MON JUL 20 2015 LINE OF CONVECTION ALONG COLD FRONT STRETCHES FROM HARRISVILLE TO A BIT NW OF HTL. THOUGH MID CLOUDS ARE SEEN IN UPPER TROFFING IN NORTHERN ONTARIO. COLD FRONT MOVING THROUGH THE REGION FIRING OFF THUNDERSTORMS THIS AFTERNOON. COLD FRONT CLEARS THE SOUTHEAST BY 02Z THIS EVENING WITH CLEARING BEHIND. THIS WILL LEAD TO A BIT COOLER AND LESS HUMID CONDITIONS TUESDAY FOLLOWED BY SLOWLY WARMING TEMPERATURES FOR THE REMAINDER OF THIS PERIOD.
ISSUED BY NATIONAL WEATHER SERVICE RAPID CITY SD 611 PM CDT MON JUL 20 2015 THE REGION IS UNDER NORTHWEST FLOW WITH BROAD UPPER RIDGING OVER THE WESTERN CONUS AND A WEAK WAVE PUSHING INTO WYOMING. UNDER HIGH PRESSURE.
743 PM EDT MON JUL 20 2015 A COLD FRONT WILL MOVE THROUGH THE REGION ON TUESDAY WITH A NARROW BAND OF SHOWERS AND POSSIBLY A FEW THUNDERSTORMS EXPECTED AHEAD OF THE FRONT. ONCE THE COLD FRONT MOVES OUT OF THE AREA TUESDAY NIGHT.
754 PM EDT MON JUL 20 2015 THROUGH TONIGHT, HIGH PRESSURE WILL PROVIDE PARTLY CLOUDY SKIES AND PLEASANT TEMPERATURES. A COLD FRONT WILL SWEEP THROUGH THE AREA ON TUESDAY AND ONCE AGAIN BRING SCATTERED SHOWERS AND THUNDERSTORMS.
648 PM CDT MON JUL 20 2015 UPPER LVL RIDGE REMAINS CENTERED DIRECTLY OVHD OF AREA.
BUT WINDS SHOULD SUBSIDE NICELY THIS EVENING AS HIGH PRESSURE BUILDS SOUTH. GENERALLY IN THE LOWER TO MIDDLE 50S. THIS HIGH PRESSURE WILL GRADUALLY SHIFT SOUTHEAST ON TUESDAY WITH SOUTHERLY WINDS DEVELOPING FROM WEST TO EAST. WITH DEW POINTS IN THE 50S AND HIGHS FROM THE LOWER TO MIDDLE 80S AN EXCEPTIONALLY NICE DAY IS EXPECTED. THE PATTERN SEEMS DESTINED TO BECOME MORE HUMID AND EVENTUALLY WARMER OVER THE NORTHERN PLAINS DURING THE TUESDAY NIGHT THROUGH MONDAY PERIOD AS SOUTHERN PLAINS RIDGING IS AGAIN FORCED SLOWLY NORTH. A SHORT WAVE COMING ACROSS THE MIDDLE OF THE RIDGE MIDWEEK.
MID LEVEL RIDGE REMAINS ACROSS TEXAS TO ACROSS THE LOWER MISSISSIPPI RIVER DELTA. MID LEVEL TROF WAS MOVING EAST ACROSS THE MID MISSISSIPPI RIVER VALLEY/OHIO RIVER VALLEY. THERE IS A BREAK IN THE DEEP LAYER RIDGE OVER THE SOUTHEAST. WITH PORTIONS OF THE FORECAST AREA ON THE EASTERN EDGE OF THE DEEP LAYER RIDGE.
902 PM EDT MON JUL 20 2015 A COLD FRONT WILL MOVE ACROSS THE REGION TUESDAY MORNING.
SURFACE ANALYSIS THIS EVENING REMAINS VERY SIMILAR TO LAST NIGHT WITH PERSISTENT WESTERLY FLOW AS HIGH PRESSURE RIDGES ACROSS THE STATE AND THROUGH THE GULF OF MEXICO.
COOLER CONDITIONS RETURN TO THE COAST TUESDAY AND WILL TREND COOLER INLAND THROUGH MIDWEEK. TEMPERATURES PEAKED IN THE LOW TO MID 80S ALONG THE CENTRAL COAST BY LATE MORNING AND COOLED SLIGHTLY AS THE SEA-BREEZE PUSHED INLAND. A DRIER AIR MASS WILL PUSH INTO THE REGION AS AN UPPER LEVEL TROUGH DROPS SOUTHWARD OUT OF THE PACIFIC NORTHWEST THROUGH MIDWEEK.
CONSENSUS OF 12Z RUNS PUSHES THE COLD FRONT A BIT FURTHER SOUTH TOMORROW BEFORE IT STALLS OUT, WHICH IN TURN SUPPRESSES THE CONVECTION A BIT FURTHER SOUTH FOR TOMORROW AND TOMORROW NIGHT. OTHERWISE, TODAYS NWP OUTPUT REMAINS IN AGREEMENT WITH EARLIER SOLUTIONS THAT RIDGE WILL SLOWLY REBOUND OVER THE CENTRAL CONUS, ALLOWING FRONTAL BOUNDARY TO BEGIN DRIFTING BACK NORTH.
The highest rain chances will be along and south of the Highway 60 corridor this evening and overnight. Temperatures will be cooler on the back side of the front with most locations in the lower to middle 80s.
1258 AM EDT TUE JUL 21 2015 ANOTHER COLD FRONT WILL APPROACH FROM THE WEST TONIGHT.
718 PM EDT MON JUL 20 2015 A COLD FRONT WILL MOVE ACROSS THE REGION TUESDAY MORNING.
1004 PM EDT MON JUL 20 2015 COLD FRONT REMAINS STALLED ACROSS CT-RI-SE MASS. A SECOND COLD FRONT SWEEPS THROUGH THE REGION TUESDAY NIGHT. HIGH PRESSURE BUILDS OVER THE REGION INTO THE WEEKEND. TEMPERATURES / DEWPOINTS: TO THE N/W OPEN YOUR WINDOWS! LOWS DOWN TO AROUND THE LOW-60S WITH DEWPOINTS IN THE UPPER-50S. LOW PRESSURE IN QUEBEC WILL BRING A COLD FRONT INTO SOUTHERN NEW ENGLAND BY TUESDAY EVENING.
1027 PM EDT MON JUL 20 2015 SLIGHTLY LESS HUMID CONDITIONS ARE EXPECTED THROUGH TONIGHT BEHIND A WEAK COLD FRONT DROPPING SOUTH OF THE REGION. ANOTHER COLD FRONT WILL BRING ONE MORE DAY OF SCATTERED SHOWERS AND THUNDERSTORMS TO CENTRAL PENNSYLVANIA BEFORE DRY HIGH PRESSURE BUILDS FOR THE SECOND HALF OF THE WEEK. SHORT WAVE TROUGH MOVING THROUGH NRN OH AND WILL MOVE STEADILY THROUGH PA OVERNIGHT. A CLUSTER OF STORMS OVER ECENT OH JUST AHEAD OF THE TROUGH ARE ON TRACK TO MAKE IT INTO THE WESTERN MTNS AROUND 2 AM. LITTLE FORCING TO ORGANIZE ANYTHING AND LOSS OF SUN WILL LIKELY SUPPRESS FURTHER CONVECTION UNTIL THE DEEPER PART OF A SHORT WAVE TROUGH MOVES IN FROM THE UPPER GREAT LAKES LATE TONIGHT.
846 PM EDT MON JUL 20 2015 SLIGHTLY LESS HUMID CONDITIONS ARE EXPECTED THROUGH TONIGHT BEHIND A WEAK COLD FRONT DROPPING SOUTH OF THE REGION. ANOTHER COLD FRONT WILL BRING ONE MORE DAY OF SCATTERED SHOWERS AND THUNDERSTORMS TO CENTRAL PENNSYLVANIA BEFORE DRY HIGH PRESSURE BUILDS FOR THE SECOND HALF OF THE WEEK. LITTLE FORCING TO ORGANIZE ANYTHING AND LOSS OF SUN WILL LIKELY SUPPRESS FURTHER CONVECTION UNTIL THE DEEPER PART OF A SHORT WAVE TROUGH MOVES IN FROM THE UPPER GREAT LAKES LATE TONIGHT.
A COLD FRONT WILL MOVE INTO THE NORTHERN CWA LATER THIS EVENING THAT WILL MOVE THROUGH THE CWA OVERNIGHT. CONSENSUS OF 12Z RUNS PUSHES THE COLD FRONT A BIT FURTHER SOUTH TOMORROW BEFORE IT STALLS OUT, WHICH IN TURN SUPPRESSES THE CONVECTION A BIT FURTHER SOUTH FOR TOMORROW AND TOMORROW NIGHT. OTHERWISE, TODAYS NWP OUTPUT REMAINS IN AGREEMENT WITH EARLIER SOLUTIONS THAT RIDGE WILL SLOWLY REBOUND OVER THE CENTRAL CONUS, ALLOWING FRONTAL BOUNDARY TO BEGIN DRIFTING BACK NORTH.
728 PM EDT MON JUL 20 2015 STORMS LATER TONIGHT AND TUESDAY AHEAD OF A COLD FRONT. EXPECT MOST OF THE CONVECTION FOLLOWING THIS EXITED DISTURBANCE WILL BE MAINLY ALONG THE COLD FRONT. HIGH PRESSURE WILL BE THE NAME OF THE GAME AND SLIGHTLY COOLER AIR WITH LOWER DEWPOINTS FOR THE SHORT TERM FORECAST. NO REAL CHANGES TO THE EXTENDED WITH MODELS HOLDING ONTO HIGH PRESSURE INTO THE WEEKEND.
A SHORT WAVE TROF WILL ALSO TRACK FROM IA/MO INTO IL BY 00Z/7 PM. THE CHANCES OF SHOWERS AND THUNDERSTORMS WILL DIMINISH FROM NW TO SE OVERNIGHT AND END BY DAWN TUESDAY AS HIGH PRESSURE OVER THE DAKOTAS SETTLES INTO WESTERN IA BY TUE MORNING. LOWS TONIGHT RANGE FROM THE LOWER 60S NW OF THE IL RIVER TO THE LOWER 70S SE OF I-70. AT THE SAME TIME, UPPER-LEVEL TROFFING WILL SETTLE IN ACROSS THE MIDWEST. THIS SCENARIO IS SUPPORTIVE OF DRY, LESS HUMID, AND COOLER THAN NORMAL CONDITIONS THROUGH MIDWEEK.
A WEAK SURFACE TROF WILL PUSH SOUTHWARD INTO FAR NORTH ALABAMA TUESDAY AFTERNOON. THIS TROF WILL PRODUCE INCREASING WESTERLY WINDS AFTER 15Z. THIS TROF WILL ALSO BE THE FOCUS FOR TSTM DEVELOPMENT AFTER 18Z.
100 AM EDT TUE JUL 21 2015 A COLD FRONT WILL MOVE ACROSS THE REGION TUESDAY MORNING.
WEAK RIDGING OVER THE NORTHERN ROCKIES AND AN UPPER LOW OVER ONTARIO. WITH THE RIDGE AXIS SHIFTING EAST OF THE MISSOURI RIVER IN THE AFTERNOON ALLOWING FOR RETURN FLOW OF SOUTHERLY WINDS. AND THEN RECOVER TO THE LOW/MID 80S FOR HIGHS ON TUESDAY.
818 PM EDT MON JUL 20 2015 THROUGH TONIGHT, HIGH PRESSURE WILL PROVIDE PARTLY CLOUDY SKIES AND PLEASANT TEMPERATURES. A COLD FRONT WILL SWEEP THROUGH THE AREA ON TUESDAY AND ONCE AGAIN BRING SCATTERED SHOWERS AND THUNDERSTORMS.
1053 PM EDT MON JUL 20 2015 A COLD FRONT WILL MOVE THROUGH THE REGION ON TUESDAY WITH A NARROW BAND OF SHOWERS AND POSSIBLY A FEW THUNDERSTORMS EXPECTED AHEAD OF THE FRONT. ONCE THE COLD FRONT MOVES OUT OF THE AREA TUESDAY NIGHT.
This is especially true in Albany where the radar beam typically shoots above the higher downburst velocities in the summertime, and this evening was no exception with reports of several trees and power lines down in the Albany area and even some hail with a very tall storm that had an elevated reflectivity core.
A WEAKENING COLD FRONT THAT IS NORTH OF THE OHIO RIVER AREA AS OF 0045Z.
633 PM CDT MON JUL 20 2015 SLOW MOVING COLD FRONT WAS FINALLY MAKING ITS WAY THROUGH IOWA TODAY. BEHIND THIS FRONT WAS COOLER AND DRIER AIR. TUESDAY LOOKS TO BE GORGEOUS SUMMER DAY ACROSS THE AREA AS HIGH PRESSURE DOMINATES THE AREA.
SUBSIDENCE FROM THE UPPER LEVEL RIDGE WILL LIKELY LIMIT COVERAGE BUT IT STILL SEEMS REASONABLE THAT SOME PRECIP WILL DEVELOP. /ISSUED 336 PM CDT MON JUL 20 2015/ THE MAIN HEADLINE IF YOU WANT TO CALL IT THAT IS THE PERSISTENT UPPER LEVEL RIDGE. AGAIN DO NOT THINK COVERAGE WILL BE ALL THAT GREAT DUE TO THE RIDGING ALOFT WHICH SHOULD BE AROUND 592-593 DM AT 500MB. THE CENTER OF THE RIDGE DOES LOOK TO RETROGRADE BACK TO OVER W TX FOR THE COMING WEEKEND. 39 DESPITE THE UPPER RIDGE OF HIGH PRESSURE REMAINING ANCHORED OVER THE REGION.
/ISSUED 242 PM CDT MON JUL 20 2015/ LATEST WATER VAPOR CHANNEL LOOP AND GOES DERIVED TPW SHOWS ANOMALOUS MOISTURE FLOWING NORTHWARD ACROSS EASTERN NEW MEXICO ON THE WESTERN EDGE OF UPPER RIDGE. SUBJECTIVE SURFACE ANALYSIS AT 18Z SHOWS A WEAK COLD FRONT/COMPOSITE OUTFLOW ORIENTED NORTHEAST TO SOUTHWEST FROM NEAR WHEELER TO JUST SOUTH OF CANYON. THE TENDENCY OF MID LEVEL HEIGHTS WILL BE TO FALL SLIGHTLY AS UPPER RIDGE DEAMPLIFIES AND THIS SHOULD SUPPORT GREATER COVERAGE OF CONVECTION THAN HAS BEEN SEEN IN PREVIOUS DAYS.
COMBINED WITH THE HIGH MELTING-LEVEL. TEMPERATURES ARE EXPECTED TO BE COOLER TUESDAY WITH HIGHS RANGING FROM THE MID 80S NORTH TO MID 90S SOUTH.
MID/UPPER LEVEL HIGH PRESSURE REMAINS PARKED OVER THE STATE.
A COLD FRONT WILL MOVE SOUTHEAST THROUGH THE REGION ON TUESDAY. WITH DRIER AND SLIGHTLY COOLER CONDITIONS EXPECTED THROUGH THE MIDDLE OF THE WEEK. A COLD FRONT WILL BE MOVING ACROSS THE MICHIGAN BORDER. THIS FRONT DELINEATES THE LEADING EDGE OF A SLIGHTLY COOLER AND SIGNIFICANTLY DRIER AIR MASS.
TUESDAY SHOULD BE VERY QUIET ACROSS THE CWA AS HIGH PRESSURE BUILDS BACK INTO THE REGION. HIGHS WILL BE IN THE LOW TO MID 80S WITH LOWS IN THE UPPER 50S TO MID 60S.
842 PM EDT MON JUL 20 2015 DEEP LAYER HIGH PRESSURE IS PARKED ACROSS THE KEYS AREA AND THE EASTERN GULF OF MEXICO. A TROUGH IS MOVING EASTWARD THROUGH THE CENTRAL MISSISSIPPI VALLEY WHILE AN UPPER LEVEL RIDGE BUILDS NORTHWARD OVER THE FRONT RANGE. ANOTHER UPPER LOW IS DRIFTING ACROSS THE YUCATAN HEADING FOR THE PACIFIC OCEAN. WITH THE DEEP LAYER RIDGE IN PLACE WE FIND VERY WEAK STEERING FLOW ALOFT. DEEP LAYER HIGH PRESSURE IS IN CONTROL OF THE KEYS AREA.
AS THE SURFACE COLD FRONT IS NOW CROSSING INTO THE CWA. FALLING INTO THE LOW 70S BY DAYBREAK. THE BOUNDARY OVER KY WILL CONTINUE TO LOSE STRENGTH AS ANOTHER COLD FRONT QUICKLY PUSHES SOUTH AND INTO THE STATE BY MORNING.
SCATTERED WEAK CONVECTION DEVELOPED ALONG ASSOCIATED LEADING PRESSURE TROUGH IN INTERESTING NEAR STORM ENVIRONMENT. REGARDLESS THIS CONVECTION SHOULD EXIT FORECAST AREA BY 00Z WITH COOLER. TRUE COLD FRONT APPEARS TO LAG PRESSURE TROUGH SLIGHTLY WITH DEWPOINTS NOT REALLY LOWERING MUCH UNTIL FAR NWRN IA.
A WEAK COLD FRONT HAS ALSO PUSHED THROUGH MUCH OF SOUTHWEST KANSAS EARLY THIS AFTERNOON.
1145 PM CDT MON JUL 20 2015 THE REGION IS UNDER NORTHWEST FLOW WITH BROAD UPPER RIDGING OVER THE WESTERN CONUS AND A WEAK WAVE PUSHING INTO WYOMING. UNDER HIGH PRESSURE.
1154 PM CDT MON JUL 20 2015 SLOW MOVING COLD FRONT WAS FINALLY MAKING ITS WAY THROUGH IOWA TODAY. BEHIND THIS FRONT WAS COOLER AND DRIER AIR. TUESDAY LOOKS TO BE GORGEOUS SUMMER DAY ACROSS THE AREA AS HIGH PRESSURE DOMINATES THE AREA.
A WEAK UPPER TROUGH AND LOW LEVEL ONSHORE FLOW WILL BRING MORNING CLOUDS AND PARTLY TO MOSTLY SUNNY AFTERNOONS FOR MOST OF WESTERN WASHINGTON THIS WEEK.
AND ALSO THROUGH A LARGER-SCALE RIDGE OVER THE WRN CONUS. THE UPPER RIDGE-TROUGH PATTERN WILL SHIFT SLOWLY EWD THE NEXT FEW DAYS. FOR TNGT AS THE UPPER TROUGH APPROACHES A SOUTHERLY LOW-LEVEL JET WILL DEVELOP AND HELP BRING HIGHER THETA-E AIR BACK INTO THE CWA.
735 PM EDT MON JUL 20 2015 A COLD FRONT WILL MOVE ACROSS THE REGION ON TUESDAY WITH A NARROW BAND OF SHOWERS AND POSSIBLY A FEW THUNDERSTORMS EXPECTED AHEAD OF THE FRONT. ONCE THE COLD FRONT MOVES OUT OF THE AREA TUESDAY NIGHT.
A WEST-SOUTHWEST FLOW ALOFT AROUND AN UPPER LEVEL HIGH OVER THE SOUTHERN PLAINS WILL BRING MOISTURE FROM THE REMNANTS OF DOLORES. AIRMASS OVER NORTHEAST COLORADO IS STILL CAPPED AND DRY AT THE LOWER LEVELS WHICH IS PREVENTING CONVECTION FROM FORMING. SCATTERED TO ISOLATED STORMS WILL FORM OVER THE HIGHER TERRAIN LATE THIS AFTERNOON AND EARLY EVENING. A SHORT WAVE TROUGH NEAR LAS VEGAS WILL MOVE NORTHEAST ACROSS THE GREAT BASIN AND ROCKIES TONIGHT AND TUESDAY. THIS COMBINED WITH INCREASING MOISTURE MAY BRING A FEW SHOWERS TO THE HIGH COUNTRY TONIGHT AND TO NORTHEAST COLORADO TUESDAY MORNING. AIRMASS WILL BECOME UNSTABLE TUESDAY WITH CAPES UP TO 500 J/KG OVER THE HIGHER TERRAIN AND UP TO 1000 J/KG OVER THE EASTERN PLAINS. CLOUD COVER WILL KEEP HIGHS BE BELOW NORMAL WITH READINGS IN THE LOWER 80S ACROSS NORTHEAST COLORADO.
A LOW WILL APPROACH THE AREA FOR COOLER AND DRIER CONDITIONS BY MIDWEEK THEN CONTINUE INTO THE WEEKEND. AS WELL AS FAIRLY STRONG WIND SHEAR IN THE LOWER TO MID LEVELS. THE WEAK LOW PRESSURE AREA PRODUCING THE CIRCULATION PREVIOUSLY MENTIONED WILL MOVE THROUGH SOUTH-CENTRAL CALIFORNIA ON TUESDAY.
AND SEASONAL TEMPERATURES WILL FOLLOW PASSAGE OF A TUESDAY COLD FRONT. THE COLD FRONT AND MAIN TROUGH ADVANCE AND PASSAGE WILL SPAWN MORE SHOWERS AND STORMS ON TUESDAY. HIGH PRESSURE WILL DEVELOP IN THE WAKE OF THE COLD FRONT TO BRING DRY AND SEASONABLY COOL. RESTRICTION CHANCES WILL THEN INCREASE AFTER DAYBREAK ON TUESDAY AS A COLD FRONT ADVANCES ON.
HEAT INDICES HAVE EXCEEDED 100 DEGREES IN MOST LOCATIONS WITH THE HIGHEST VALUES ACRS CNTL AND S CNTL LA WHERE APPARENT TEMPS ARE BETWEEN 107 AND 111 DEGREES. THE PERSISTENT RIDGE ALOFT REMAINS PARKED ACRS THE SOUTH PER THE LATEST UA ANALYSIS/WV IMAGERY. THE CWA REMAINS ON THE SRN PERIPHERY OF THE UPPER RIDGE WHERE DEEPER MOISTURE AND DISTURBANCES IN THE ELY FLOW ALOFT ARE BRINGING A FEW SHOWERS AND SOME ISLTD BUT POTENT LOOKING TSTMS TO SERN/S CNTL LA. THE STORMS ACRS THE LOWER ATCHAFALAYA BASIN WILL CONTINUE TO MOVE SLOWLY WEST THROUGH EARLY EVENING. RAIN CHCS WILL BE SLIGHTLY HIGHER ON TUESDAY AS DEEP MOISTURE CONTINUES TO SPREAD WEST AND INTERACTS WITH WEAK DISTURBANCES ON THE PERIPHERY OF THE UPPER RIDGE.
AN UPPER LEVEL TROUGH WILL CONTINUE TO GRADUALLY SETTLE OVER THE PACIFIC NORTHWEST OVER THE NEXT 24 TO 36 HOURS. TEMPERATURES WILL BE 5 TO 10 DEGREES COOLER ON TUESDAY.
1026 PM CDT MON JUL 20 2015 INFLUENCE OF UPPER RIDGE OVHD BRINGING ANOTHER OVERNIGHT OF VFR SKC AND NEAR CALM TO LGT SOUTH WIND. /ISSUED 1012 PM CDT MON JUL 20 2015/ THE DOMINANT UPPER LEVEL RIDGE IN PLACE OVER THE SRN PLAINS/FOUR STATE REGION HAS BEGUN TO SLIGHTLY FLATTERN THIS EVENING. THIS HAS ACTUALLY SHIFTED THE RIDGE CENTER SLIGHTLY S INTO ECNTRL TX THIS EVENING /PER WATER VAPOR IMAGERY/. BUT SHOULD REMAIN STOUT OVER CNTRL TX/THE LOWER MS VALLEY THROUGH MIDWEEK BEFORE FLATTENING FURTHER. AS SUBSIDENCE BENEATH THE DEATH RIDGE CONTINUES.
THE REMNANT CIRCULATION FROM FORMER TROPICAL CYCLONE DOLORES CONTINUES TO SPIN COUNTERCLOCKWISE ABOUT 250 MILES WEST-SOUTHWEST OF LOS ANGELES OVER THE OFFSHORE COASTAL WATERS.
1012 PM CDT MON JUL 20 2015 THE DOMINANT UPPER LEVEL RIDGE IN PLACE OVER THE SRN PLAINS/FOUR STATE REGION HAS BEGUN TO SLIGHTLY FLATTERN THIS EVENING. THIS HAS ACTUALLY SHIFTED THE RIDGE CENTER SLIGHTLY S INTO ECNTRL TX THIS EVENING /PER WATER VAPOR IMAGERY/. BUT SHOULD REMAIN STOUT OVER CNTRL TX/THE LOWER MS VALLEY THROUGH MIDWEEK BEFORE FLATTENING FURTHER. AS SUBSIDENCE BENEATH THE DEATH RIDGE CONTINUES.
AND CONVECTION CURRENTLY OVER THE HIGHER TERRAIN WAS SLOW TO START. AND IN THE 60S AND 70S FOR THE HIGH VALLEYS. A FLAT RIDGE OF HIGH PRESSURE OVER THE SOUTHERN U. MAX TEMPS TOMORROW MAY BE A DEGREE OR TWO COOLER. 60S AND 70S FOR THE HIGH VALLEYS.
A HIGH PRESSURE RIDGE WILL MOVE SLOWLY SOUTH ACROSS ARIZONA THROUGH THE WEEKEND. A HIGH PRESSURE RIDGE OVER THE REGION WILL SLOWLY SLIDE SOUTH OVER THE WEEKEND AS A TROUGH OF LOW PRESSURE SLOWLY SLIDES SOUTH ALONG THE WEST COAST.
STRONG HIGH PRESSURE IS IN QUEBEC AND HEADING TOWARD NEW ENGLAND. THE RIDGE AXIS EXTENDS BACK ACROSS THE NRN GREAT LAKES. LARGE AND BROAD RIDGING ENGULFS ALL BUT THE PAC NW AND MAINE WITH WARM/COMFORTABLE TEMPERATURES ACROSS MOST OF THE COUNTRY. THERE WERE A COUPLE OF CUT OFF LOWS STILL FLOATING AROUND UNDER THE RIDGE. AS BROAD UPPER TROUGHING ACROSS EASTERN CANADA STARTS WORKING TOWARD THE DAKOTAS. WHILE THE ASSOCIATED COLD FRONT AND RAINFALL WILL REMAIN WELL WEST OF US FROM THE DAKOTAS THROUGH WESTERN ONTARIO. COOLER READINGS IMMEDIATELY DOWNWIND OF THE GREAT LAKES (NE LOWER COAST AND EASTERN CHIP/MACK COUNTIES.
TODAY AND TONIGHT UPPER LEVEL RIDGE (588 DAM AT 500 MB PER 00Z APX SOUNDING) WILL HOLD ON FOR ANOTHER DAY ACROSS SOUTHEAST MICHIGAN. EXPANSIVE UPPER LEVEL RIDGE WILL MAINTAIN GENERALLY QUIET CONDITIONS OVER THE AREA THROUGH THE WEEKEND. THERE WILL ONLY BE A MINUTE CHANCE OF A SHOWER AS MOISTURE EDGES EVER SO SUBTLY NORTHWARD INTO AREA FROM UPPER LEVEL DISTURBANCE STALLED WITHIN NEGLIGIBLE FLOW WITHIN CENTER OF THE LARGER SCALE UPPER RIDGE. THIS WILL EVENTUALLY LEAD TO DEEPENING UPPER LEVEL TROUGH FROM HUDSON BAY EASTWARD WITH THE CURRENT UPPER RIDGE OVER THE AREA BEGIN REPLACED BY UPPER TROUGH EXTENDING SOUTH AND SOUTHWEST FROM THIS FEATURE. WHILE THERE WILL BE A SMALL CHANCE OF ISOLATED SHOWERS DURING THE UPCOMING WEEK AS THE AREA COMES UNDER THE INFLUENCE OF THIS TROUGH.
CLOUDINESS THIS MORNING OVER SW IDAHO /WITH A COLD FRONT/ WILL EXIT E LEAVING MOSTLY SUNNY CONDITIONS WITH TWO EXCEPTIONS. HIGH BASED CU IS EXPECTED NEAR THE OREGON BLUE MTNS THIS AFTERNOON/EVENING AND SOME CLOUDS WILL LINGER OVER S CENTRAL IDAHO NEAR THE DRY COLD FRONT. WAVY COLD FRONT IS EXPECTED TO REMAIN S AND E OF OUR AREA THROUGH SUNDAY. NAM/EC KEEP A BIT STRONGER UPPER RIDGE OVER US. THIS IS A DRIER AND SLIGHTLY WARMER FORECAST THAN PREVIOUSLY.
NEAR TERM AND SHORT TERM SECTIONS HAVE BEEN UPDATED BELOW AN UPPER LOW WILL BRING LOW CHANCES FOR VERY LIGHT RAIN TO THE AREA ALONG WITH COOLER TEMPERATURES THROUGH THE WEEKEND.
HIGH PRESSURE OVER THE SOUTHWESTERN UNITED STATES WILL MAINTAIN UNSEASONABLY WARM CONDITIONS THROUGH THE WEEKEND.
248 AM CDT SAT SEP 26 2015 A BROAD AREA OF LOW PRESSURE REMAINS IN PLACE OVER THE SOUTHERN AND SOUTHEAST PART OF THE U. DISRUPTING THE FLOW AROUND A LARGER SCALE RIDGE IN PLACE ACROSS NORTH AMERICA. UPPER LOW.
COLD FRONT WILL BRING MUCH COOLER CONDITIONS FOR SUNDAY. TEMPERATURES WILL ONCE AGAIN APPROACH RECORD LEVELS AHEAD OF A LATE DAY COLD FRONT. DRY COLD FRONT WILL DROP THROUGH THE AREA LATE IN THE DAY THROUGH THIS EVENING. BEHIND THE COLD FRONT TEMPERATURES WILL DROP TOWARD MORE SEASONAL READINGS IN THE UPPER 60S TO MID 70S. PACIFIC MOISTURE ADVECTION FROM THE SOUTHWEST WILL OVER-RUN COOLER SURFACE AIR SUNDAY AFTERNOON THROUGH SUNDAY NIGHT. SHOWERS WILL DEVELOP OVER THE HIGHER TERRAIN SUNDAY AFTERNOON DUE TO THIS WEAK FORCING.