Aikyam-Lab/Synoptic-Bench huggingface dataset:
423 AM EDT WED JUL 22 2015 A COLD FRONT WILL MOVE THROUGH FROM THE NORTHWEST THIS MORNING. A WEAK LOW PRESSURE AREA WILL DEVELOP ALONG THE FRONT AND WILL PASS TO THE SOUTH THURSDAY.
144 AM EDT WED JUL 22 2015 A LARGE AREA OF HIGH PRESSURE WILL BUILD OVERHEAD ON WEDNESDAY BRINGING A STRETCH OF DRY WEATHER FOR THE SECOND HALF OF THE WEEK.
AN UPPER-LEVEL TROUGH IS FORECAST TO DROP THROUGH THE PACIFIC NORTHWEST INTO CALIFORNIA WEDNESDAY. ISOLATED THUNDERSTORMS WILL BE POSSIBLE EVEN OVER THE LOWER ELEVATIONS THROUGH LATE THIS AFTERNOON INCLUDING THE SAN JOAQUIN VALLEY AS THERE IS ENOUGH INSTABILITY AND LOW LEVEL MOISTURE FROM RECENT RAINFALL FOR CONVECTION TO TAKE PLACE TODAY. 12Z WRF IS INDICATING THE CIRCULATION CENTER OFF THE CENTRAL CA COAST OPENING UP AND SHIFTING EAST TONIGHT AS UN UPPER TROUGH DEEPENS ALONG THE PAC NW AND NORCAL COASTS.
641 AM EDT WED JUL 22 2015 QUIET WEATHER WILL PREVAIL THROUGH THE REMAINDER OF THE WEEK AS HIGH PRESSURE BUILDS OVER THE REGION. THIS HIGH PRESSURE WILL BRING COOLER AND DRIER WEATHER TO THE AREA. BROAD CYCLONIC FLOW ALOFT WILL PREVAIL TODAY OVER THE NORTHEAST BRINGING COOLER AND DRIER WEATHER TO CENTRAL NY AND NORTHEAST PA. WINDS WILL WEAKEN AFTER SUNSET AS HIGH PRESSURE STARTS TO CONTROL THE AREA. TEMPS ARE EXPECTED TO FALL INTO THE LOW TO MID 50S TONIGHT. BROAD UPPR LVL LOW WILL CONTINUE TO BE OVER THE NORTHEAST WITH HIGH PRESSURE AT THE SURFACE.
315 AM PDT WED JUL 22 2015 A DEVELOPING UPPER-LEVEL LOW PRESSURE TROUGH ALONG THE WEST COAST WILL BRING COOLER AND DRIER WEATHER ACROSS THE SOUTHLAND FOR THE REMAINDER OF THE WEEK. THE MARINE LAYER WILL THIN BY THIS WEEKEND AS HIGH PRESSURE BUILDS WEST FROM THE ROCKIES. BRINGING WARMER DAYS TO THE REGION WITH TEMPERATURES BACK TO NEAR NORMAL LEVELS.
MOST ACTIVITY WEDNESDAY WILL BE CONFINED TO THE HIGHER ELEVATIONS OF SOUTHEAST WYOMING BUT SOME CONVECTION MAY REACH INTO THE PLAINS. IT WILL BE WARMER TOMORROW WITH MUCH LESS CLOUD COVER. AN UPPER RIDGE WILL BUILD INTO THE ROCKIES WEDNESDAY NIGHT AND THURSDAY. WHILE RIDGING WILL SUPPRESS MOST CONVECTION A FEW ISOLATED THUNDERSTORMS CAN NOT BE RULED OUT OVER THE MOUNTAINS OF SOUTHEAST WYOMING AND SURROUNDING AREAS THURSDAY AFTERNOON. THE 00Z MEDIUM RANGE MODELS ARE IN AGREEMENT DEPICTING A LARGE SCALE UPPER RIDGE OVER THE NATION'S MIDSECTION.
125 AM EDT WED JUL 22 2015 AVIATION HIGH PRESSURE WILL BUILD IN AND PRODUCE FAIR WEATHER MID TO LATE WEEK.
539 AM EDT WED JUL 22 2015 DRY WEATHER AND SEASONAL TEMPERATURES CAN BE EXPECTED INTO THE WEEKEND AS HIGH PRESSURE SLIDES OVER THE UPPER OHIO REGION. WITH HIGH PRESSURE MOVING INTO THE REGION TODAY.
AS AN UPPER TROF DIGS INTO THE W COAST TODAY. BUT PICKS UP AGAIN THU AFTN AS ANOTHER MINOR UPPER WAVE IS EJECTED FROM THE MAIN UPPER TROF STILL OVER THE W COAST. ACTIVITY WILL CONTINUE THROUGH THURSDAY EVENING AS THE MAIN UPPER TROF MOVES THRU.
344 AM CDT WED JUL 22 2015 HIGH PRESSURE SYSTEM WILL CONTINUE TO PUSH TO THE EAST THROUGHOUT THE DAY TODAY.
DRY HIGH PRESSURE FOR WEDNESDAY INTO THE WEEKEND. THERE IS A SHOT AT A NEAR 50 DEGREE LOW TEMP IN THE E RANDOLPH CO AND THE HIGHEST ELEVATIONS IN THE N MOUNTAINS.
447 AM CDT WED JUL 22 2015 Another nice day in store across the region as temperatures will once again top out in the lower 80s and dewpoints in the 60s to near 70. Precipitation chances will increase this evening and overnight across the area as ridging begins to replace the quasi-zonal flow that has been in place across the central US. The low-level jet will be focused in western Kansas this evening, but will also pick up some behind a boundary in southern Missouri. As moisture begins pooling along with boundary and the low-level jet increases tonight, convection is expected to develop along this boundary and work its way northward into the CWA.
125 AM EDT WED JUL 22 2015 UPPER LAKES IS STILL WITHIN THE INFLUENCE OF TROUGHING ALOFT WITH COOLER AIR ALOFT.
SOMEWHAT FLAT UPPER RIDGE OVER THE SOUTHERN U. HAS NOW KICKED SHOWERS AND STORMS OFF OVER THE HIGHER TERRAIN AND ADJACENT PLAINS. MODELS INDICATE THAT THE UPPER RIDGE WILL START TO STRENGTHEN AND BUILD INTO COLORADO. AND 80S FOR THE HIGH VALLEYS. \/HODANISH MAIN CONCERN WILL BE FOR SOME MVFR TO POSSIBLY IFR CIGS DEVELOPING LATE TONIGHT OR EARLY WED MORNING OVER THE LOWER ARKANSAS VALLEY AND PORTIONS OF THE SE CO PLAINS. VERY MOIST CONDITIONS ARE PRESENT IN THE LOWER LEVELS AND WINDS WILL BE LIGHT. PROBABILITY IS SLIGHTLY LOWER AT KPUB SO WILL LEAVE THE LOW CLOUD GROUP SCT FOR NOW. BUT THEY SHOULD STAY CONFINED TO THE HIGHER ELEVATIONS.
328 AM EDT WED JUL 22 2015 TROUGH OVER THE EASTERN U. WITH THE ATLANTIC RIDGE SHUNTED SOUTH OVER THE FL STRAITS WILL CONTINUE A PREVAILING SOUTHWESTERLY WIND FLOW ACROSS SOUTH FL.
MEANWHILE A WEAK UPPER RIDGE OVER THE NORTHERN PLAINS STRENGTHENS LATER TONIGHT AS AN UPSTREAM TROUGH REACHES THE WEST COAST OF THE U. A WEAK 850 MB RIDGE EXTENDS ACROSS SOUTHERN WISCONSIN THIS AFTERNOON.
UPPER RIDGE REMAINS IN CONTROL. BUT MAYBE A DEGREE HIGHER OUT TO THE WEST WHERE THE BOUNDARY LAYER TEMPERATURES ARE A BIT WARMER. MAYBE A DEGREE WARMER AT NIGHT BY THURSDAY MORNING AS BOUNDARY LAYER WINDS KEEP MIXING A BIT BETTER (ALTHOUGH SLIGHTLY DRIER AIR COULD OFFSET A BIT).
155 AM EDT WED JUL 22 2015 A COLD FRONT WILL MOVE THROUGH FROM THE NORTHWEST EARLY WEDNESDAY MORNING. LOW PRESSURE WILL PASS BY JUST TO THE SOUTH THURSDAY.
1224 AM EDT SUN AUG 23 2015 A COLD FRONT WILL REMAIN STALLED JUST OFF THE COAST THIS WEEKEND PROMPTING SCATTERED SHOWERS AND A FEW THUNDERSTORMS WITH THE AIRMASS REMAINING HUMID AND SEASONABLY WARM. THIS UNSETTLED WEATHER WILL CONTINUE THROUGH THE FIRST HALF OF THE COMING WEEK AS ANOTHER COLD FRONT STALLS UPON REACHING THE NORTHEASTERN UNITED STATES. LOW PRESSURE WILL MOVE UP THE EASTERN SEABOARD SUNDAY AND SUNDAY NIGHT. ALTHOUGH THE LOW STAYS WELL OFFSHORE, MODELS SHOW MOISTURE FROM THIS SYSTEM MOVING INTO SOUTHERN NEW HAMPSHIRE AND WESTERN MAINE. CYCLONE PHASE DIAGRAMS SUGGEST A SUBTROPICAL LOW WILL BE SITUATED WELL EAST OF OUR FORECAST AREA.
1149 PM CDT SAT AUG 22 2015 UPPER LEVEL LOW MOVING INTO THE MID RED RIVER VALLEY NEAR FARGO. AREA OF RAIN ON THE NORTH AND WEST SIDE OF THE LOW PROGRESSING SOUTH AND THEN SOUTHEAST AROUND IT. WINDS INCREASING BEHIND THE UPPER LOW AS EXPECTED.
MOISTURE ASSOCIATED WITH THE UPPER LOW OVER WESTERN NORTH DAKOTA IS JUST MAKING ITS WAY TO THE HIGHWAY 83 CORRIDOR AND WILL CONTINUE TO TRACK EASTWARD THIS EVENING. THE UPPER LOW IS PRODUCING SOME PRESSURE FALLS OVER CENTRAL NORTH DAKOTA WHICH IS HINDERING THE STRONGER WINDS. BUT AS THE LOW MOVES EAST. THE STRONG LOW PRESSURE SYSTEM ASSOCIATED WITH THE WINDY AND SHOWERY DAY SATURDAY AND SATURDAY NIGHT. THEN A WESTERN RIDGE BUILDS BRINGING SEASONABLE AUGUST WEATHER TO OUR AREA THROUGH THE UPCOMING WEEK. SUNDAY EVENING THE STRONG LOW PRESSURE SYSTEM IS FORECAST TO BE CENTERED OVER SOUTHWESTERN ONTARIO. WITH HIGH PRESSURE SETTLING OVER THE DAKOTAS THROUGH THE NIGHT. THE BUILDING WESTERN RIDGE WILL BRING A WARMING TREND.
751 PM EDT SAT AUG 22 2015 HIGH PRESSURE WILL PREVAIL OVER THE REGION THROUGH SUNDAY.
MID AND UPPER TROUGH AXIS ALONG THE MISSISSIPPI RIVER WILL CONTINUE TO WORK SLOWLY EAST NEXT SEVERAL HOURS WITH COLDER TEMPS ALOFT WORKING OVER THE AREA SO THINK WE WILL BE LOOKING AT ANOTHER ROUND OF CONVECTION TRYING TO ORGANIZE OVER NORTH MISSISSIPPI/NORTHWEST ALABAMA NORTHWARD INTO MIDDLE TENNESSEE AFTER MIDNIGHT.
844 PM EDT SAT AUG 22 2015 HIGH PRESSURE WILL DOMINATE THE AREA THROUGH THE WEEKEND.
WITH POTENTIAL TERRAIN ENHANCEMENT ALONG THE BUFFALO RIDGE. COLD FRONT IS SCREAMING THROUGH THE FORECAST AREA AT THIS TIME.
852 PM EDT SAT AUG 22 2015 HIGH PRESSURE WILL BUILD INTO THE AREA FROM THE NORTH THROUGH SUNDAY NIGHT.
934 PM EDT SAT AUG 22 2015 HIGH PRESSURE OVER THE EASTERN GREAT LAKES THIS EVENING.
HOWEVER WITH AN UPPER TROF TO OUR WEST AND 8H WINDS EXPECTED TO INCREASE TO ARND 20 KT. AN UPPER TROF ALONG THE MS RIVER IS PRODUCING SCT SHRA/TSRA ACROSS THE TN VALLEY. HOWEVER AS THE UPPER TROF MOVES ACROSS THE CWA OVERNIGHT/SUNDAY MRNG WILL KEEP PCPN CHANCES THRU 20Z BEFORE TAPERING OFF. THINKING IS THAT AS THE WAVE GETS CLOSER TO THE AREA ALONG WITH THE HIGHER INSTABILITIES AND 20-25KT OF 0-1KM SHEAR. WINDS START TO SHIFT TO THE NW SUNDAY MORNING BEHIND WHAT LOOKS TO BE A PRE-FRONTAL TROUGH OF SOME SORT WHICH COULD USHER IN SOME SLIGHTLY DRIER AIR AHEAD OF THE MAIN FRONT.
352 AM CDT Tue Jul 7 2020 08Z water vapor imagery shows a deeper 500mb trough now moving into the Pacific Northwest with broader troughing over the Northern Plains, while the rest of the CONUS stays within broad ridging. Today the ridge axis makes its way into the Central Plains, which turns winds a bit more southerly and brings temperatures just slightly warmer than yesterday into the low 90s area-wide. As for precip, the HRRR has been generating very isolated convection in far eastern KS where the better moisture is located, but today's environment would be less favorable for it compared to the last few days with the strengthening ridge. Lows tomorrow morning will be similar to the last few days in the low 70s.
334 AM CDT Tue Jul 7 2020 H5 analysis from earlier this evening had a broad area of high pressure which extended from the Four Corners east into the sern states.
306 AM EDT Tue Jul 7 2020 Moisture continues to stream into the region from the south ahead of an area of low pressure moving eastward through southern Georgia. Temperatures are on track with lows forecast in the lower 70s. Mid-level trough will extend over the region today and become centered over the region tonight. 4 inches with the highest values east. Clouds and rain will keep temperatures around 10 degrees below normal, with highs only in the lower to middle 80s. Overnight lows in the lower 70s.
CD Chattanooga Airport, TN 87 72 89 72 91 / 60 50 60 20 60 Knoxville McGhee Tyson Airport, TN 87 70 88 71 91 / 60 30 50 20 60 Oak Ridge, TN 88 70 89 70 91 / 60 30 50 20 60 Tri Cities Airport, TN 85 67 85 67 88 / 50 40 60 20 50.
Hot temperatures will continue through the week, with afternoon highs in the lower 90s outside of higher terrain. Best focus for additional showers and thunderstorms Wednesday afternoon appears to be across the ridges and higher elevations, with some expansion in coverage westward through the afternoon. High temperatures in the low 90s will persist.
Heights will begin to fall west this evening as a strong upper- level wave and surface cold front approaches.
Upper level trough has brought onshore flow with breezy conditions and cooler temperatures. Temperatures under the onshore flow have been 2 to 8 degrees cooler than last night. Afternoon highs will be near normal levels The upper level pattern will flatten out as the trough exits to the east. Four Corners ridging will gradually expand westward into the region.
Late in the week a strong high pressure system is forecast to build over the southwest United States producing the hottest temperatures this year. Under the influence of a passing trough daytime temperatures will cool by a few degrees but generally remain right at to just above normal.
For today we are looking at typical summer conditions with dry/warm weather with upper ridging migrating east across the interior CONUS. and temps will edge a couple degrees warmer with daytime highs 90-95F. Flow aloft transitions southwest tonight ahead of closed low/upper trough translating across Alberta/northern Rockies. Storms are expected to develop along a cold frontal boundary oriented from north central thru western Neb in the mid to late aftn and organize and move southeast across our CWA Wednesday evening and night. not surprising given the high dewpoints and precipitable water values around an inch and half.
With the broad upper level ridge remaining in place over the central CONUS, we will continue with a persistence forecast for Tuesday and Wednesday. This translates to dry conditions and enough heat to induce day-dreams about cooler weather. Highs will continue to rise into the lower 90s by the afternoon for Tuesday, with lows bringing little relief in the lower 70s. Dew points are expected to stay in the lower 70s, and that paired with the light surface winds is what is causing an uncomfortable weather pattern, to say the least. Wednesday holds a similar weather story with highs in the lower 90s and the chance for afternoon pop-up showers.
These showers and storms, extending into eastern Washington and Oregon, are developing ahead of an approaching cold front which will move through the northern Rockies later this morning through the afternoon hours. Expect breezy westerly winds gusting 15-25 mph this afternoon as the cold front moves through western Montana.
We are also seeing some showers beginning to develop across our offshore waters, and the higher moisture axis associated with activity could help to bring some showers and thunderstorms to the coastal areas this morning with activity working its way inland later this morning and on through this afternoon. Best rain chances (on the low side) tonight and Wednesday are expected to be confined to areas in/around our northeast counties (roughly north through northeast of the Huntsville area). As we head towards the end of the week and into the weekend, a strong and persistent upper ridge will build into the central CONUS, paving the way for drier conditions but also unseasonably warm temperatures across SE TX.
All in all little change needed to the fcst for this update as the region remains under the influence of a weak H5 low and consequent moisture advection from the lower level circulations. Thus, the fcst continues to feature increasing pops through the afternoon with the highest pops southward along the US64 corridor as well as the southern Plateau/Mountains, while pops maximize in the chance range further north. CD Chattanooga Airport, TN 87 71 90 71 92 / 60 30 70 30 60 Knoxville McGhee Tyson Airport, TN 87 70 89 70 91 / 40 20 70 20 50 Oak Ridge, TN 88 69 90 70 92 / 40 20 60 20 50 Tri Cities Airport, TN 86 67 87 67 88 / 40 20 60 20 50.
A transient upper ridge will cross the forecast area today leading to mostly sunny skies through much of the day. However, as the ridge shifts eastward this afternoon, a disturbance in the southwesterly flow aloft will affect the forecast area. A cool front will push through the area behind the main wave tonight with slightly cooler and drier weather expected on Wednesday in most places, except for over parts of south central South Dakota where frontal convection will be possible in the afternoon. There remains some question on how far east the trough will advance during the afternoon, so considered leaving SD Fire Zone 322 in far southwestern South Dakota out of the Red Flag Warning.
The spine of a mid level ridge will extend over southwest Kansas today. At the surface, the lee trough will deepen slightly. For Wednesday, lee troughing will continue. To the south, the area should remain capped and more mixed and thus highs in the lower 100s still look possible near the Oklahoma border. For fire weather concerns on Wednesday, looks like the lowest RH's will be collocated with the weaker winds near the sfc trof.
Both Tuesday and Wednesday will be hot and humid with highs in the low 90s.
The Atlantic ridge that has been to our south in the last several days slightly lifted north and its axis is near the Lake Okeechobee.
Storms will form across the higher terrain in central and southwest Montana during the afternoon hours and will progress eastward into Northeast Montana. An upper trough moves across the state on Wednesday with slightly cooler and generally drier weather. A few storms are possible near the Canadian border with the proximity of a stacked low pressure system moving from Saskatchewan into Manitoba. Ridge then builds north from the Desert Southwest for hot and dry weather for the remainder of the week.
This front lifts northward by Wednesday with a weakening cold front west of our region leading to a few thunderstorms.
An upper trough is over the Pacific Northwest this morning with high pressure now squashed to the south. A modestly cooler air mass will result in slightly lower temperatures today with highs a little below climatological normals. The trough lifts out over the northern Rockies on Wednesday as a zonal flow remains across California.
Prefer the drier NAM on PoPs for tonight, as the upper ridge becomes dominant again.
An upper disturbance will cross the region today with a few showers and cooler temperatures.
The main forcing mechanism today is a short wave trough tracking across central Montana.
Today-tonight: With exit of upper trough, only minor 300MB diffluence, and warming 500MB temperatures, would expect storms to be less numerous today. While there is a fair amount of difference between models on 850MB moisture, it appears that at least southeast KS may hold onto the higher dewpoints another day.
The weakness in the ridge over us should enable at least some widely scattered deep moist convection in the afternoons, mostly driven by diurnal instability.
641 AM EDT Tue Jul 7 2020 Moisture continues to stream into the region from the south ahead of an area of low pressure moving eastward through southern Georgia. Mid-level trough will extend over the region today and become centered over the region tonight. 4 inches with the highest values east.
Forecast soundings suggest the potential for an uncapped environment from 700-600 mb on the backside of the complex north of I-90, which may lead to high based shower and thunderstorms along the highway 14 corridor into southwest Minnesota this morning. Further to the east, convective debris will keep temperatures a bit cooler. Southerly winds will increase across the Northern Plains today as low pressure deepens over southern Saskatchewan. Wednesday looks to be a very warm and muggy day ahead of a cold front associated with the low pressure system across central Canada. As this cold front works east, expect thunderstorms to develop Wednesday afternoon.
Quiet conditions then move in for Wednesday with high pressure over Lake Michigan and primarily light southerly winds expected.
A weak cold front appeared to be moving through north central and far northeast WI, though the exact location was difficult to pinpoint. High temperatures should be a little cooler than yesterday, mainly in the middle to upper 80s. A warm front will lift back north across the region on Wednesday, and may trigger a few storms over far north central WI.
NV is remaining in between a high pressure to the south and a long wave trough to the north. There is a short wave trough that is passing through the long wave trough axis which will bring slightly cooler air into the area for today. No moisture is associated with the short wave trough or with the broader scale flow from the high and trough which will continue to keep NV very dry.
851 AM EDT Tue Jul 7 2020 Low pressure is tracking eastward across northeastern GA toward SC. Waves of showers and thunderstorms will stream over the area waters today with the highest chances over the GA waters.
08Z water vapor imagery shows a deeper 500mb trough now moving into the Pacific Northwest with broader troughing over the Northern Plains, while the rest of the CONUS stays within broad ridging. Today the ridge axis makes its way into the Central Plains, which turns winds a bit more southerly and brings temperatures just slightly warmer than yesterday into the low 90s area-wide. As for precip, the HRRR has been generating very isolated convection in far eastern KS where the better moisture is located, but today's environment would be less favorable for it compared to the last few days with the strengthening ridge. Lows tomorrow morning will be similar to the last few days in the low 70s.
Weak mid-level disturbance will interrupt ridging pattern today. Tomorrow, however, temperatures warm a bit as the mid-level ridge builds over the region once again.
On Wednesday, surface flow will return to the south, coincident with an upper ridge building in from the west.
619 AM CDT Tue Jul 7 2020 H5 analysis from earlier this evening had a broad area of high pressure which extended from the Four Corners east into the sern states. The trough of low pressure, currently over the Pacific NW states, will quickly transition east this morning, approaching the northern Rockies by afternoon. Based on the latest NAM12, NAMNEST and GFS solns, went ahead and painted the highest pops east of highway 83.
These showers and storms, extending into eastern Washington and Oregon, are developing ahead of an approaching cold front which will move through the Northern Rockies later this morning through the afternoon hours. Expect breezy westerly winds gusting 15-25 mph this afternoon as the cold front moves through western Montana.
230 AM PDT Tue Jul 7 2020 Temperatures will be running cooler for the middle of the week with continued dry conditions and typical afternoon breezes each day. Temperatures warm for the weekend with some potential for afternoon thunderstorms over the high Sierra of Mono County. While cooler today and Wednesday, afternoon RH will continue to dip into the single digits to 15% for western Nevada. Otherwise, high pressure will build over the weekend allowing temperatures to creep upwards; some west-central Nevada valleys could reach triple digits while Sierra Front locations increase into the mid/upper 90s.
The tropical, mesoscale, low pressure system driving the current weather pattern continues to meander around east central Georgia with satellite imagery currently centering it around Greensboro, GA. A moist, profile in the low-to-mid levels of the atmosphere combined with low mid-level lapse rates will make severe thunderstorms difficult to develop this afternoon, but widespread light showers and training lines of heavy showers and storms should paint the forecast area this afternoon before fading into tonight.
244 PM MDT Tue Jul 7 2020 Thunderstorms will exit Central MT this evening, as cooler air moves into the region for Wednesday.
Late in the week a strong high pressure system is forecast to build over the southwest United States producing the hottest temperatures this year.
The heat continues, thanks to an upper level ridge nosing in from the southwest and southerly surface flow.
All in all little change needed to the fcst for this update as the region remains under the influence of a weak H5 low and consequent moisture advection from the lower level circulations. Thus, the fcst continues to feature increasing pops through the afternoon with the highest pops southward along the US64 corridor as well as the southern Plateau/Mountains, while pops maximize in the chance range further north. CDG Chattanooga Airport, TN 71 91 71 92 73 / 20 60 30 60 20 Knoxville McGhee Tyson Airport, TN 70 91 70 91 71 / 30 50 20 50 20 Oak Ridge, TN 69 91 70 92 71 / 20 50 20 50 20 Tri Cities Airport, TN 67 88 67 88 68 / 20 50 20 50 20.
/Tonight through Wednesday Night/ Convection is starting to increase in coverage this afternoon with the aid of diurnal heating along with a upper low drifting eastward across East Texas into north Louisiana/south Arkansas. This convection is expected to continue through much of the morning hours on Wednesday, gradually diminishing through the evening hours as the upper low shifts eastward out of the region.
Generally quite weather overnight with no precipitation with lows in the lower 70s. Warmer air moves over Iowa on Wednesday as the thermal ridge moves further east though the much warmer air will remain south and west of the state into Nebraska and Kansas. Overall, temperatures should be a few degrees warmer than today with dew points near to slightly lower. Thunderstorms are expected to develop along a frontal boundary over South Dakota and Nebraska then evolve into an MCS as the low level jet increases in the evening.
A line of showers and thunderstorms accompanying an upper trough was moving through northeast Valley county this morning. Breezy and cooler conditions today with highs around 10 degrees below normal.
In the coming days, the mean ridge position still looks to set up to the west, which puts the forecast area in a northwest upper flow pattern.