Aikyam-Lab/Synoptic-Bench huggingface dataset:
342 PM MDT TUE JUN 28 2016 As of early this afternoon thunderstorms were firing over the San Juan Mountains with outflow boundaries spreading to the southwest toward the lower elevations of the Four Corners. Convection was approaching thunderstorm stage over all ridgelines in the forecast area and storms were over Before 4 pm thunderstorms will little rain and gusty winds should be over the area currently in a Red Flag Warning in southwest CO and southeast UT. Today's convection will further moisten the lower levels so more storms will be rain-producing over SW and central CO and SE UT.
Otherwise, a mostly clear night and a little cooler than last night should be in store. High pressure will persist Wednesday with the air mass probably peaking in warmth.
High pressure builds in for Wednesday. Cooler for the remainder of the week. High pressure builds in for Wednesday. with high pressure in control.
Early Wednesday morning there may be a few locations with visibility restrictions in mist/BRwith brief mvfr due light winds and cooler morning temperatures. High pressure building into the forecast area will provide north to northeast winds 5-10 knots.
Rain chances will continue to decrease throughout the evening tonight as dry air pushes southward behind an actual cold front.
355 PM EDT TUE JUN 28 2016 A cold front will approach from the northwest through Wednesday, then stall across the area into the weekend.
455 PM EDT TUE JUN 28 2016 An upper trough will move east of the region this evening as high pressure builds in from the upper Great Lakes.
1237 PM CDT TUE JUN 28 2016 The secondary cold front stretches pretty much along I-70 at 08z. Otherwise high pressure will build southward from the upper MS Valley today in the wake of the cold front. Highs today will be cooler than yesterday but have trended a tad warmer than the previous forecast. The high centered will continue to settle southeastward into IL tonight, and then move slowly into the OH Valley Valley by Wednesday night.
336 PM EDT TUE JUN 28 2016 Mid level low that tracked across lower Michigan through the base of the longwave trough, is now lifting northeast through southern Ontario away from the area. There is a filament of vorticity rotating around the backside of the low, which is trying to nose into northern Michigan. It sparked a few showers over northern Lake Huron, but dry air behind the cold front dropping through mid MI (dewpoints in the 30s!) is quickly eroding them. High pressure will start building into the area tonight, bringing with it the dry air already moving into northern Michigan. The aforementioned dome of high pressure will then center itself over southern Michigan by Wednesday evening.
149 PM EDT TUE JUN 28 2016 A weak cold front will push slowly across the area today. Weak high pressure should build in from the north for the middle to latter part of the week. Another cold front is expected to push into the area over the weekend. Prefrontal trough has moved through our much of our forecast area, although those areas mainly south of I85 are still dealing with showers/thunderstorms along a surface convergence axis, deep moisture and enhanced left exit region of jet-let.
(Issued 1018 AM CDT TUE JUN 28 2016) The 15z surface analysis indicated that the remnants of the pre- frontal trough was south of the forecast area well into central Alabama, extending northeast into north Georgia. Isolated to scattered showers were mainly occurring south of the Tennessee river and will slowly sink southward in the low-mid level northwest flow through the afternoon. The main cold front to the northwest of the forecast area was situated from west to east across southeast Missouri through north central Kentucky at 15z. Lingering cloud cover associated with an old boundary will slowly drift south as a cold front approaches from the north.
Surface dewpoints may only drop to the lower 60s toward daybreak and there will be some radiation so it appears that some fog will form in the northern and central valley.
110 PM EDT TUE JUN 28 2016 Cooler air will continue to move into the area today accompanied by post frontal clouds. Skies will clear tonight as a ridge of high pressure moves into the area. A cold front was over lower Michigan near Grand Rapids early this morning and was moving south. The front will move across the forecast area early this morning and bring much cooler air with highs today only in the low to mid 70s.
The best environment for thunderstorms through the overnight hours will be across our western zones and this is where we will continue to carry the highest chances. The 12z NAM and GFS are the most optimistic in our area finally catching some rain with the highest likelihood across western zones. Overall the high temperatures should be more pleasant than what we had through most of June with highs only around 80 to the lower 80s on most days. Main concern for the TAFS is whether or not convection along the high plains will organize and sustain during the overnight hours to impact KEAR and KGRI.
405 PM CDT TUE JUN 28 2016 Radar looked more active across the area this afternoon as low pressure aloft finally has gotten a foothold. An upper level trough of low pressure will hang around another day with the best chance of rain remaining across the southern half of the area.
235 PM EDT TUE JUN 28 2016 High pressure offshore will allow a more humid air mass to move into the region on a southerly wind. A slow moving cold front approaching from the west will bring scattered showers and thunderstorms through Wednesday.
SHORT TERM (Tonight through Wednesday Night): Overall, a high-pressure ridge axis aloft stretching back toward the Four Corners region continues to dominate the region.
VFR conditions to remain in place until early Wednesday morning as the light northerly flow abates and the cooler air behind the front becomes saturated around 06-12z.
234 PM MDT TUE JUN 28 2016 As of early this afternoon thunderstorms were firing over the San Juan Mountains with outflow boundaries spreading to the southwest toward the lower elevations of the Four Corners. Convection was approaching thunderstorm stage over all ridgelines in the forecast area and storms were over Before 4 pm thunderstorms will little rain and gusty winds should be over the area currently in a Red Flag Warning in southwest CO and southeast UT. Today's convection will further moisten the lower levels so more storms will be rain-producing over SW and central CO and SE UT.
317 PM CDT TUE JUN 28 2016 A trough continues to set up across the lee of the Rockies today. Temperatures today will be about 5 to 10 degrees warmer than yesterday. The main low pressure center will stay south into southeastern Montana and western South Dakota. A cold front will combine with favorable jet dynamics to spark more widespread showers and thunderstorms on Wednesday.
SHORT WAVE TROUGH MOVING NNE THROUGH OREGON THIS AFTERNOON WILL SET OFF SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS IN HARNEY COUNTY AND WRN-MOST BAKER COUNTY LATE TODAY AND THIS EVENING.
EVENTUALLY THE MIDWESTERN UPPER LOW WILL TRANSLATE EASTWARD TO THE OHIO VALLEY TOMORROW. AND THE ASSOCIATED COLD FRONT WILL BEGIN TO AFFECT TAFS FROM WEST TO EAST WITH VFR VCSH CONDITIONS LATE IN THE PERIOD OR JUST BEYOND THE 24 HOUR TAF PERIOD.
216 PM EDT WED APR 20 2016 WEAK HIGH PRESSURE TODAY. PRECIPITATION CHANCES INCREASE FOR SECOND HALF OF THE WEEK WITH AN UPPER LEVEL LOW/COLD FRONT. HIGH PRESSURE FOR THE WEEKEND. AS THE UPPER LOW PARKED OVER THE PLAINS STATES STILL WAITS FOR A KICKER. WITH FILTERED SUNSHINE THRU CIRRUS CLOUDS FLOWING OVER THE UPPER RIDGE STILL DOMINATING THE OHIO VALLEY. LOOK FOR HIGH TEMPERATURES RANGING FROM THE UPPER 70S FAR NORTH TO THE LOWER 80S SOUTH. INCREASING LOW LEVEL MOISTURE AND RELATIVELY LIGHT WINDS OUTSIDE OF SOME MOUNTAIN RIDGETOP GUSTS WILL KEEP CONDITIONS BELOW RED FLAG.
510 PM EDT WED APR 20 2016 WARM FRONT PASSES TO THE WEST. PRECIPITATION CHANCES INCREASE FOR SECOND HALF OF THE WEEK WITH AN UPPER LEVEL LOW/COLD FRONT. HIGH PRESSURE FOR THE WEEKEND. WARM FRONT PASSES TO OUR WEST WITH A SUBTLE INCREASE IN INSTABILITY OVER THE SOUTH AND WESTERN PARTS OF OUR FORECAST AREA THIS AFTERNOON. A WARM NIGHT TONIGHT IN WARM SECTOR BEFORE A COLD FRONT APPROACHES FROM THE WEST INCREASING CHANCES FOR RAIN.
437 PM MDT WED APR 20 2016 WATER VAPOR IMAGERY IS SHOWING TRUE SIGNS THAT THIS OVER-WELCOME LOW PRESSURE SYSTEM IS FINALLY ACCELERATING EASTWARD. THIS ACTIVITY WILL DISSIPATE RATHER QUICKLY WITH THE LOSS OF HEATING THIS EVENING FOLLOWED BY A MUCH DRIER AND WARMER PERIOD TO CLOSE OUT THE WEEK. WEAK WARM ADVECTION ON THE LEADING EDGE OF THE BUILDING RIDGE OVERHEAD MAY TICK OFF SOME LIGHT ISOLATED SHOWERS IN THE SAN JUANS TO THE EASTERN UINTA MOUNTAINS TOMORROW AFTERNOON.
Overnight lows will range from around 40 except warmer southeast of Dodge around 40 to 45 degrees.
344 PM CDT WED APR 20 2016 PARENT UPPER LOW CONTINUES TO SPIN/WOBBLE ACROSS NEBRASKA. THE UPPER LOW WHICH HAS AFFECTED MID-AMERICA FOR DAYS WILL FINALLY PROGRESS EAST THURSDAY.
222 PM CDT WED APR 20 2016 We are currently watching scattered showers/few tstorms develop and move across the western part of the CWA due to perturbations associated with an upper level low over Nebraska. As the center of the upper low moves into the western IA later today and into this evening, this area of scattered convection will shift across the area from west to east. With the main trough associated with closed low in the upper Midwest pivoting toward the area.
A STRENGTHENING HIGH PRESSURE SYSTEM WILL BRING CLEAR SKIES AND UNSEASONABLY WARM TEMPERATURES. A SERIES OF PACIFIC LOW PRESSURE SYSTEMS WILL BRING COOLER TEMPERATURES.
A LOW PRESSURE TROUGH WILL APPROACH THE AREA THURSDAY.
AN UPPER LEVEL TROUGH WILL CONTINUE TO SLOWLY MAKE ITS WAY TOWARD THE AREA TONIGHT AND INTO TOMORROW. TEMPERATURES WILL BE SLIGHTLY COOLER TOMORROW DUE TO THE INCREASED CLOUD COVER. MAIN SYSTEM OF CONCERN THIS EXTENDED WILL BE A LOW PRESSURE SYSTEM MOVING THROUGH EARLY IN THE PERIOD.
237 PM EDT WED APR 20 2016 WARM FRONT PASSES TO THE WEST. PRECIPITATION CHANCES INCREASE FOR SECOND HALF OF THE WEEK WITH AN UPPER LEVEL LOW/COLD FRONT. HIGH PRESSURE FOR THE WEEKEND. WARM FRONT PASSES TO OUR WEST WITH A SUBTLE INCREASE IN INSTABILITY OVER THE SOUTH AND WESTERN PARTS OF OUR FORECAST AREA THIS AFTERNOON. A WARM NIGHT TONIGHT IN WARM SECTOR BEFORE A COLD FRONT APPROACHES FROM THE WEST INCREASING CHANCES FOR RAIN.
235 PM PDT WED APR 20 2016 High pressure will keep warm and dry conditions in place through Thursday with westerly afternoon breezes.
A COLD FRONT WILL PUSH THROUGH THE REGION FROM THE NORTHWEST.
A HIGHLY AMPLIFIED BUT POSITIVELY TILTED LONGWAVE TROUGH WILL SHIFT OUT OF THE PLAINS SHIFTING ACROSS THE MISSISSIPPI RIVER VALLEY TOMORROW NIGHT. DEW POINTS WILL BE IN THE LOW 60S SO A STRONG TO SEVERE STORM CANNOT BE RULED OUT. FEEL LIKE THE HIGHER THREAT FOR STRONG OR SEVERE STORMS WILL REMAIN TO OUR SOUTH AND WEST WHERE DEW POINTS WILL CLIMB INTO THE MIDDLE 60S.
155 PM EDT WED APR 20 2016 HIGH PRESSURE WILL KEEP THE AREA DRY FOR ONE MORE DAY. LOW PRESSURE WILL TRACK FROM THE MIDWEST ACROSS THE CENTRAL LAKES AND TO ONTARIO CANADA.
FAVORING AN UPPER LEVEL RIDGE OF HIGH PRESSURE IN CONTROL OVER THE REGION.
UPPER LOW OVER WESTERN NE WILL SLOWLY PULL AWAY FROM THE REGION TODAY. ACCUMULATIONS OF UP TO 3 INCHES WILL BE POSSIBLE ACROSS THE HIGHER MOUNTAINS. TEMPERATURES TODAY SHOULD WARM BACK INTO THE 60S ACROSS THE LOWER ELEVATIONS WITH 40S AND 50S FOR THE VALLEYS AND MOUNTAIN LOCATIONS. THIS WILL ALLOW FOR SLIGHTLY COOLER OVERNIGHT LOWS.
327 PM MDT WED APR 20 2016 LAST MAJOR SHORT WAVE ROTATING SOUTH THROUGH COLORADO THIS AFTERNOON AS UPPER LOW FINALLY PULLS AWAY FROM THE AREA INTO THE MIDWEST. WAVE HAS FORCED A MIX OF RAIN AND SNOW SHOWERS OVER THE HIGHER TERRAIN THIS AFTERNOON. DRIER/WARMER WEATHER RETURNS AS UPPER RIDGE BUILDS OVER THE ROCKIES BEHIND THE DEPARTING LOW. AS A SERIES OF PACIFIC LOW PRESSURE SYSTEMS MOVE INTO THE ROCKIES.
145 PM EDT WED APR 20 2016 HIGH PRESSURE MOVES ACROSS THE REGION TODAY. THE HIGH MOVES OFF THE COAST THURSDAY.
333 PM CDT WED APR 20 2016 EARLY AFTERNOON WATER VAPOR IMAGERY INDICATED THE CENTER OF THE UPPER LOW WAS LOCATED OVER E-CNTRL NEB/W-CNTRL IA AND WAS BECOMING VERTICALLY STACKED. ONCE THIS SYSTEM EXITS TO THE SOUTHEAST ON THURSDAY HEIGHT RISES AND WARMER TMPS SHOULD BE THE STORY HEADING INTO THE WEEKEND.
WATER VAPOR SATELLITE IMAGERY SHOWS A PLUME OF MID AND HI LEVEL MOISTURE ADVECTING WESTWARD OVER THE CWA IN THE NORTHWEST QUAD OF THE LOW. EXPECT WE WILL DRY OUT QUICKLY OVERNIGHT AS THE UPPER LOW PUSHES EASTWARD AND LARGE SCALE RIDGING BUILDS IN FROM THE WEST.
MEANWHILE MAIN FCST CHALLENGE WILL BE COLD FRONT THAT WILL BE DROPPING SOUTH OVERNIGHT. EXPECT A SHARP COLD FRONT WITH A SHARP WIND CHANGE TO THE NORTH AND INCREASE IN SPEED TO REACH THE INTL BORDER IN THE 04Z TIME FRAME AND RACE SOUTH EXITING THE SRN FCST AREA BY 12Z.
STRONG UPSLOPE NE FLOW WITH LINGERING LOW LEVEL MOISTURE WILL ALSO FAVOR SOME DZ/FZDZ N CNTRL OVER THE HIGHER TERRAIN. THE NRLY WINDS WILL KEEP MAX TEMPS IN THE LOWER 40S NEAR LAKE SUPERIOR WITH MAX READINGS TO AROUND 50 INLAND. GIVEN THE GREENLAND BLOCKING HIGH. SFC AND MID LEVEL RIDGING WILL BEGIN TO DOMINATE WITH DRY WEATHER MORE LIKELY. AS A LOW PRESSURE SYSTEM MOVES TOWARD THE AREA. NORTHERLY WINDS TO 30 KNOTS ARE EXPECTED BEHIND A COLD FRONT ACROSS CENTRAL LAKE SUPERIOR LATE THU AFTERNOON INTO THU EVENING.
DRY AND WARMER WEATHER WILL GRACE NORTHERN ARIZONA THROUGH THURSDAY UNDER HIGH PRESSURE ALOFT.
300 PM PDT WED APR 20 2016 HIGH PRESSURE WILL CONTINUE TO PROVIDE DRY AND UNSEASONABLY WARM CONDITIONS THROUGH THURSDAY.
338 PM CDT WED APR 20 2016 Widespread showers are moving through the area this afternoon ahead of a strong vortmax on the eastern side of the upper level low over Nebraska. There is a wind shift to the west from about 850mb to the surface forecast to come through the area tonight, and this wind shift should cut off much of the low level moisture which will shut off the precip as it passes. There is another shot at more convection on Thursday as the cold core of the upper low moves across northern portions of the area. Lapse rates steepen nicely and there will be another low level trof to provide lift.
645 PM EDT WED APR 20 2016 HIGH PRESSURE REMAINS IN PLACE OVER THE REGION TONIGHT AND SHIFTS SLOWLY EAST THURSDAY.
Today and Thursday will be quite similar in that they will both be mostly sunny, a few degrees warmer than the previous, and quite dry.
ISSUED BY NATIONAL WEATHER SERVICE BINGHAMTON NY 306 PM EDT WED APR 20 2016 HIGH PRESSURE OVER THE MID-ATLANTIC WILL BRING CLEAR MILD CONDITIONS LATE TODAY INTO TONIGHT.
245 PM PDT WED APR 20 2016 Strong high pressure will continue over the Pacific Northwest into Thursday leading to generally dry and very warm weather.
1130 AM MDT WED APR 20 2016 HIGH PRESSURE CONTINUES TO BUILD INTO THE REGION, BRINGING WIDESPREAD CLEAR SKIES AND WARM TEMPERATURES.
230 PM EDT WED APR 20 2016 HIGH PRESSURE OVER NEW YORK STATE WILL MOVE INTO THE MID ATLANTIC TONIGHT BEFORE SLIDING OFFSHORE THURSDAY.
WINDS WILL PICK UP TOMORROW AFTERNOON OUT AHEAD OF THIS SYSTEM WITH THE HIGHER GUSTS JUST BEYOND THIS TAF PERIOD.
ISSUED BY NATIONAL WEATHER SERVICE LA CROSSE WI 300 PM CDT WED APR 20 2016 CLOSED UPPER LEVEL LOW/VERTICALLY STACKED SYSTEM WILL MAKE ITS WAY EAST TONIGHT/THU. TAKING A MORE NORTHEAST-SOUTHWEST ORIENTATION AS THE LOW CENTER MEANDERS EAST. GETTING INGESTED INTO THE MEAN TROUGH THU MORNING. THIS FEATURE COULD SPARK A FEW SHOWERS OUTSIDE OF THE MAIN BAND OF PCPN ASSOCIATED WITH THE LOW.
228 PM CDT WED APR 20 2016 Over the past 24 hours, the upper pattern has become more progressive with the upper low finally making its way into the northern plains. The best chance for convection through this evening will be across the Lower Trans Pecos/Stockton Plateau, where a couple of storms have already developed as of 2PM CDT along a lingering outflow boundary from last night's convection. As cooler air filters in behind the front, temperatures Thursday are expected to be in the 70s to lower 80s, with a few readings in the lower 90s in the Rio Grande Valley.
340 PM CDT WED APR 20 2016 LARGE AND SLOW MOVING UPPER LOW WILL CONTINUE TO WOBBLE EASTWARD THROUGH EASTERN NEBRASKA AND WESTERN IOWA TONIGHT AND THURSDAY. SOUTH CENTRAL SD INTO THE HIGHWAY 14 CORRIDOR IN SOUTH DAKOTA WILL REMAIN LARGELY OUTSIDE OF THE MORE PERSISTENT RAINFALL. LATEST MODEL RUNS ARE MUCH SLOWER IN EXITING THE UPPER LOW. UPPER RIDGING DOMINATES ACROSS THE WESTERN PLAINS AND FRONT RANGE OF THE ROCKIES. ALLOWING CHILLY HIGH PRESSURE TO FILTER DOWN INTO THIS FORECAST AREA DOWN THE FRONT SIDE OF THE UPPER RIDGE. HAVE NO SUB FREEZING TEMPERATURES IN THE AREA.
WITH SCT SHOWERS RETURNING TO C/EC WI LATE IN THE DAY AS A STRONGER S/W TROF APPROACHES. AS THE PREVIOUSLY-MENTIONED S/W TROF AND THE LFQ OF AN UPPER JET MOVE INTO THE REGION. THE ARRIVAL OF WEAK LOW PRESSURE AND THE WEAKENING UPPER LEVEL LOW/TROUGH SHOULD CAUSE SHOWERS TO INCREASE IN COVERAGE IN THE AFTERNOON.
448 PM EDT WED APR 20 2016 HIGH PRESSURE REMAINS IN PLACE ACROSS THE FLORIDA PENINSULA AND ADJACENT WATERS.
631 PM EDT WED APR 20 2016 HIGH PRESSURE WILL PROVIDE PLEASANT SPRING WEATHER THROUGH THURSDAY MORNING.
315 PM MDT WED APR 20 2016 WATER VAPOR IMAGERY IS SHOWING TRUE SIGNS THAT THIS OVER-WELCOME LOW PRESSURE SYSTEM IS FINALLY ACCELERATING EASTWARD. THIS ACTIVITY WILL DISSIPATE RATHER QUICKLY WITH THE LOSS OF HEATING THIS EVENING FOLLOWED BY A MUCH DRIER AND WARMER PERIOD TO CLOSE OUT THE WEEK. WEAK WARM ADVECTION ON THE LEADING EDGE OF THE BUILDING RIDGE OVERHEAD MAY TICK OFF SOME LIGHT ISOLATED SHOWERS IN THE SAN JUANS TO THE EASTERN UINTA MOUNTAINS TOMORROW AFTERNOON.
THE LOW LEVEL WINDS WILL BE VERY LIGHT AND VARIABLE. THURSDAY'S HIGHS ARE 3-4 C ARE WARMER THAN CURRENT HIGHS. AN UPPER LEVEL RIDGE WILL BRING A DRIER AND SUBSIDENT AIRMASS TO THE REGION.
THUNDERSTORMS ARE EXPECTED TO DEVELOP TODAY OVER THE HIGH PLAINS AND MOVE SOUTHEAST WITH THE HIGHEST CHANCES IN WESTERN SECTIONS OF NORTH TEXAS AND SOUTHWESTERN OKLAHOMA.
UPPER LEVEL RIDGE WILL SHIFT SLOWLY EAST TODAY. A SHORT WAVE WILL MOVE NORTH ALONG THE CASCADES AND INCREASE MOISTURE AND INSTABILITY ON THE BACK SIDE OF THE RIDGE.
546 PM CDT WED APR 20 2016 We are currently watching scattered showers/few tstorms develop and move across the western part of the CWA due to perturbations associated with an upper level low over Nebraska. As the center of the upper low moves into the western IA later today and into this evening, this area of scattered convection will shift across the area from west to east. With the main trough associated with closed low in the upper Midwest pivoting toward the area.
1046 AM PDT WED APR 20 2016 Strong high pressure will continue over the Pacific Northwest today leading to dry and very warm weather.
137 PM EDT WED APR 20 2016 HIGH PRESSURE BUILDS OVER THE AREA TODAY. THE HIGH MOVES OFF THE COAST THURSDAY.
332 PM EDT WED APR 20 2016 TODAY HAS BEEN MUCH WARMER AND DRIER THAN MODELS INDICATED DUE TO THE LACK OF CLOUD COVER. A CU FIELD IS FINALLY STARTING TO FORM OVER PORTIONS OF THE AREA AS A LOW PRESSURE SYSTEM SLOWLY MAKES ITS WAY TOWARDS CENTRAL KENTUCKY.
210 PM EDT WED APR 20 2016 A WARM FRONT WILL LIFT NORTH INTO THE REGION THIS AFTERNOON INTO TONIGHT.
319 PM EDT WED APR 20 2016 HIGH PRESSURE REMAINS IN PLACE OVER THE REGION TONIGHT AND SHIFTS SLOWLY EAST THURSDAY.
THE MAIN FORECAST ISSUES IN THE SHORT TERM PERIOD ARE SHOWER COVERAGE/AMOUNTS AND POTENTIAL FOR A FEW STRONG STORMS ALONG THE TRAILING COLD FRONT/OCCLUSION. FORECAST EFFORTS FOCUSED ON SLOWING DOWN THE NORTHWARD WARM FRONT AND ASSOCIATED SHOWERS/ISOLATED STORMS. OF MORE CONCERN IS THE TRAILING COLD FRONT/OCCLUSION. SFC-850MB TROUGH AXIS NOW SLOWER TO PROPAGATE THROUGH E IOWA/W ILLINOIS CAUSING WINDS TO SLOWLY TRANSITION FROM SSW TO NW BY THE EARLY EVENING.
The upper level low that has been anchored out west the past few days will begin an eastward track the next couple of days as it opens up. The potential for a few showers will continue tonight and Thursday as the primary upper level trough axis makes its way across the region.
COOLER. A MID LEVEL SPEED MAX ROTATING AROUND THE PERSISTENT UPPER LOW THAT THIS AFTERNOON IS DRIFTING EWD OVER THE CENTRAL HIGH PLAINS.
649 PM EDT WED APR 20 2016 HIGH PRESSURE WILL CROSS THE REGION TONIGHT THROUGH THURSDAY.
144 PM CDT WED APR 20 2016 WATER VAPOR IMAGERY INDICATED AN UPPER RIDGE AXIS POSITIONED OVER THE SERN U. THE NAM APPEARS ON THE RIGHT TRACK WITH THIS TREND AS THE SLUGGISH UPPER LOW IN THE PLAINS WILL BE SLOW TO ADVANCE THE COLD FRONT ACROSS THE LOWER MS VALLEY UNTIL THURSDAY NIGHT.
241 PM EDT WED APR 20 2016 WARM FRONT PASSES TO THE WEST. PRECIPITATION CHANCES INCREASE FOR SECOND HALF OF THE WEEK WITH AN UPPER LEVEL LOW/COLD FRONT. HIGH PRESSURE FOR THE WEEKEND. WARM FRONT PASSES TO OUR WEST WITH A SUBTLE INCREASE IN INSTABILITY OVER THE SOUTH AND WESTERN PARTS OF OUR FORECAST AREA THIS AFTERNOON. A WARM NIGHT TONIGHT IN WARM SECTOR BEFORE A COLD FRONT APPROACHES FROM THE WEST INCREASING CHANCES FOR RAIN.
EXCEPT FOR COOLER TEMPS NEAR LAKE MICHIGAN UNDER CONTINUED ONSHORE WINDS. MORE SHOWERS ARE POSSIBLE LATE MORNING INTO THE AFTERNOON AS THE LOW MOVES THROUGH THE AREA.
104 PM CDT WED APR 20 2016 THE DECENT RAIN PRODUCING UPPER LOW WILL COME UP PRETTY MUCH AS EARLIER EXPECTED TODAY. THIS IS EXPECTED TO HOLD INTO THE EARLY MORNING DESPITE INCREASING HIGHER CLOUDS AHEAD OF THE SYSTEM WITH THE LOWER LEVELS MORE OR LESS LOCKED IN. TEMPERATURES WILL REACH THE LOWER TO MIDDLE 60S NORTH OF INTERSTATE 90 TODAY BUT STAY IN THE 50S IN MUCH OF NORTHWEST IOWA WITH THE DEVELOPING RAIN. THE APPROACHING NORTHWESTERLY UPPER FLOW AND ASSOCIATED RIDGING WILL BRING CLEARING NORTH AND WEST OF FSD. THURSDAY WILL SEE LOW PRESSURE ALOFT SHIFTING SOUTHEAST OF THE AREA.
338 PM CDT WED APR 20 2016 CURRENT SURFACE ANALYSIS PLACES COLD FRONT DROPPING THROUGH THE SOUTHERN PRAIRIE PROVINCES WILE RIDGE REMAINS OVER THE CENTRAL ROCKIES. WHILE RIDGE PUSHES INTO THE FAR NORTHERN PLAINS. AFOREMENTIONED COLD FRONT WILL GRADUALLY SAG INTO THE AREA WITH SOME BREEZY CONDITIONS POSSIBLE IN ITS WAKE. BREEZY CONDITIONS MAY CONTINUE OVER EASTERN LOCATIONS IN THE WAKE OF THE COLD FRONT. TEMPERATURES WILL BE COOLER MAINLY OVER EASTERN LOCATIONS AS COOL AIR WORKS INTO THE AREA BEHIND THE FRONT. UPPER LEVEL RIDGING BUILDS INTO THE AREA BRINGING WARMING TEMPERATURES TO THE AREA TO END THE WEEK.
WITH ANOTHER ROUND OF CONVECTION FCST TO MOVE INTO THE REGION LATE TONIGHT/EARLY THURSDAY MORNING ALONG A COLD FRONT.
RETURN SOUTHERLY FLOW IS ADVECTING WARMER AIR AND HIGHER DEW POINTS INTO MIDDLE TENNESSEE THIS AFTERNOON.
300 PM MST WED APR 20 2016 A STRENGTHENING HIGH PRESSURE SYSTEM WILL BRING CLEAR SKIES AND UNSEASONABLY WARM TEMPERATURES. A SERIES OF PACIFIC LOW PRESSURE SYSTEMS WILL BRING COOLER TEMPERATURES.
334 PM EDT WED APR 20 2016 HIGH PRESSURE WILL PROVIDE PLEASANT SPRING WEATHER THROUGH THURSDAY MORNING.
LOW LOOKS TO SLOWLY TRACK ALONG THE INTERSTATE 80 CORRIDOR AND WILL PROVIDE ADDITIONAL LIGHT SHOWERS/DRIZZLE ON THE BACKSIDE OF THE LOW AFTER 06Z. LOWERED POPS OVER THE SOUTHERN TWO-THIRDS OF THE FORECAST AREA DURING MUCH OF THE EVENING BEFORE THE LOW PULLS EAST OF INTERSTATE 35 OVERNIGHT. /THURSDAY THROUGH WEDNESDAY/ UPPER LEVEL LOW PRESSURE WILL BE CENTERED OVER CENTRAL IOWA EARLY THURSDAY MORNING AND WILL GRADUALLY SHIFT EAST THROUGH THE DAY. A COUPLE AREAS FOR PRECIPITATION TO FOCUS ON WITH ONE WILL BE IMMEDIATELY AHEAD OF THE UPPER LOW WHERE THE BEST KINEMATIC FORCING WILL BE LOCATED. POTENTIAL FOR SOME FOG TO LINGER NEAR THE REGIONS WHERE THE WIND REMAINS LIGHT NEAR AN ASSOCIATED INVERTED TROUGH. DESPITE A LARGE UPPER LEVEL LOW ENCOMPASSING MUCH OF CANADA.
HIGH PRESSURE WILL CONTINUE TO KEEP THE WEATHER QUIET WITH VFR CONDITIONS THROUGH THE TAF PERIOD.
341 PM EDT WED APR 20 2016 HIGH PRESSURE WILL BUILD ACROSS THE REGION TODAY THROUGH THURSDAY.
A cold front will move south through the area tonight with gusty northwest to north winds behind it.