Aikyam-Lab/Synoptic-Bench huggingface dataset:
Cooler weather will arrive this weekend with breezy to windy conditions. The westerly flow will be on the increase tomorrow as an upper low approaches the Pacific Northwest. The higher elevations of the sierra may be a bit cooler. Otherwise the upper low in the Gulf of Alaska is forecast to drop south along the British Columbia coastline tomorrow. This low will allow for significant 500 mb height falls across central California resulting in significant cooling trend.
625 PM EDT THU JUL 7 2016 Low pressure will move east of the region tonight. High pressure will build in Friday.
Cooler and less humid air will arrive in central Indiana on friday afternoon and evening as a cool front passes across the state. High pressure is then expected to sag south from Canada into the Ohio Valley for the weekend.
/issued 1040 AM EDT THU JUL 7 2016/ High pressure continues to linger over the region today. Ridging aloft also remains in place over South Florida. A relatively dry air mass will keep rain and thunderstorm activity on the low end with best chances remaining over the western half of South Florida. Moisture will be limited this afternoon and again on Friday, with 00z MFL sounding data showing less than an inch and a half of PWATS, and a dominating dry air mass at the lower atmospheric levels.
107 PM CDT THU JUL 7 2016 The short term concerns today are the severe weather threat and heavy rain threat this afternoon and evening as the upper trough moves through. ahead of the main forcing with the incoming trough and surface boundary. forcing with the incoming trough should be strong enough to generate thunderstorms along the boundary this afternoon and evening. The first chances arrive on Friday as the mid/upper low pivots over the Great Lakes and brings cyclonic flow locally.
1127 AM MDT THU JUL 7 2016 Compact upper low along the northeast Montana/Canadian border this morning will move across North Dakota today.
342 PM EDT THU JUL 7 2016 Low pressure will move east of the region tonight. High pressure will build in Friday.
The strongest feature is the upper low over north central ND, moving slowly east. High pressure will bring diminishing wind to the region.
338 PM CDT THU JUL 7 2016 Ridging will flatten someone tomorrow as an upper low traverses the Great Lakes region. Most guidance still indicates only isolated convective coverage, but it should be noted that there is some indication that the weakening ridge will allow coverage to become more scattered in nature by tomorrow afternoon. With a little more in the way of cloud cover and at least some potential for rain cooled outflow, afternoon temps should top out in the low to mid 90s instead of mid to upper 90s as has been the case the last couple days. Going into the weekend, a mid/upper level disturbance will move through the middle Mississippi Valley and this should finally be enough to weaken the ridge further and bring some relief from the heat.
Transitory ridge sliding across SE Idaho today and tonight as deep upper low continues to shift toward PacNW coast. Ridge begins to break down on Friday with moisture spilling into the region ahead of the low.
307 PM CDT THU JUL 7 2016 Trof axis overhead now resulting in elevated shower and weak thunderstorm activity. The caveat will be that there will be a fairly decent dry layer below 10kts, along with mid level ridging.
Deep layered ridging extends from the surface through the mid troposphere where it gives way to an elongated and tilted upper level trough centered over the Bahamas and central Cuba.
642 AM CDT THU JUN 2 2016 Ridging over the northeast conus ahead of trough over the great lakes. A ridge over the desert southwest with broad weak ridging into central Canada. Closed low over the gulf of Alaska with a trough into the Pacific Northwest.
556 AM MDT THU JUN 2 2016 The cutoff upper low over west central Texas moves slowly into the Gulf Coast region of Texas by Friday night. During this time, the upper ridge amplifies over the western U. , extending northward through the Intermountain region as a short wave trough rides over the ridge and deepens over the northern plains.
Scattered showers and isolated thunderstorms are possible over the higher terrain through 03z.
1024 AM EDT THU JUN 2 2016 A COLD FRONT WILL BRING SHOWERS AND THUNDERSTORMS THROUGH TONIGHT. COLD FRONT SLOWLY MOVING THROUGH NW OHIO, MARKED BY A SIGNIFICANT DROP IN DEWPOINTS. THE BEST CHANCE FOR PROLONGED SHOWER AND THUNDERSTORM ACTIVITY WILL BE OVER THE EASTERN THIRD OF THE AREA, IN LINE WITH THE AREA OF STRONGEST CONVERGENCE IN THE LOWER LEVELS AND ALSO THE PATH OF THE SUPPORTING ENERGY ALOFT. STILL RATHER WARM FRIDAY AS IT WILL TAKE ALL DAY FOR THE COOLER AIR TO FINALLY MOVE OVER THE AREA.
Rain should end eastern terminals by 19Z, although did mention a PROB30 at KVCT for the afternoon as wrap-around moisture and proximity to upper low could produce thunder in the afternoon. Impacts of upper low are occurring now, and will continue through most of the morning into the early afternoon, the latter over the eastern portions of the CWFA. If upper low is progged to be where it is now forecast to go, we may not see much if any rainfall Friday over the southwestern portions of the area.
Thanks to an upper low moving over parts of West Texas and the series of disturbances ejecting into the Southwest and West flow to the east of it convection will be on the increase today and into the night. /issued 325 AM CDT THU JUN 2 2016/ Cut-off upper low has drifted ewd into the TX panhandle over the last 24 hours and has continued to bring waves of convection to much of TX.
704 AM CDT THU JUN 2 2016 The approach of an upper level low and a weak front have created bouts with showers and a plethora of cloud layers across North and Central Texas. Thunderstorms will become more likely this afternoon as the upper low encroaches on Central TX during peak heating hours. An upper level low will slowly move east across the western portions of the state tonight and Thursday. The low will turn the surface winds to the northeast and possibly north during the day tomorrow.
1030 AM EDT THU JUN 2 2016 The cold front is still back to the northwest nearing the Ohio River as an upper level trough moves across the Great Lakes. With the high PW values, storms will also produce heavy rainfall later this afternoon. Chattanooga Airport, TN 86 68 90 69 / 50 40 40 30 Knoxville McGhee Tyson Airport, TN 85 67 86 67 / 60 50 50 30 Oak Ridge, TN 86 66 86 67 / 60 50 50 30 Tri Cities Airport, TN 83 64 84 63 / 60 50 50 40.
Clear skies within building high pressure will support calm to variable wind overnight. * None Cold front over western Michigan will continue to work across the state early today. Upper trough will lift out of the Northern Great Lakes today, leaving Southeast Michigan under westerly flow. Ridging at the surface will help keep dry and quiet weather over the area with light winds, although lake breezes will push inland Friday afternoon/early evening.
This morning's 12Z KKEY RAOB observation sampled southeasterlies from the surface through 700 MB, highlighting the building subtropical ridge to our northeast. The dry northwesterlies persist aloft and are associated with the filling upper tropospheric trough.
Upper trough continues to slowly edge eastward toward southeast Texas and southwest Louisiana. Early morning sfc analysis shows the region remaining between high pressure over the sern CONUS and low pressure over TX. Local 88Ds show showers and a storm or two beginning to pop up over our TX zones last hour as this higher moisture interacts with a low- level convergence zone. High POPs then linger into the weekend as the low approaches.
947 AM EDT THU JUN 2 2016 High pressure will retreat to the east of the area today.
1109 AM EDT THU JUN 2 2016 A cold front will move across the area today. Upper low to pass thru the Great Lakes and open up in the westerly flow. This will allow a weak surface cold front over to push southeast across ILN/s fa this afternoon. Temperatures look good with highs in the lower and middle 80s. Temperatures are expected to be cooler today than the past few days with additional cloud cover in place. Went with high temperatures in the low to middle 80s.
This should mean we see highs in the 80s but somewhat 'cooler' daytime highs than what we have seen over the past few days. However, a sheared vort max ejecting off the upper low over TX may provide enough lift for thunderstorm activity over W TN/N MS.
Observing water vapor, the large 500mb trough over central Texas continues to churn east and northeastward. The flood watch will remain in effect until 00Z, but may need to be extended through Friday across SE OK depending on the progression of the mid to upper low now moving over the Big Bend of TX.
1223 PM EDT THU JUN 2 2016 A cold front will bring showers and thunderstorms through tonight. Still rather warm Friday as it will take all day for the cooler air to finally move over the area.
1224 PM EDT THU JUN 2 2016 A slow moving cold front will cross the region today and Friday with showers and perhaps a thunderstorm.
Temperatures will be about 5 degrees cooler than yesterday with the cloud cover.
Cold air aloft in association with the southern periphery of the departing trough north of Lake Superior has lead to a significant increase in cu development across srn WI.
921 AM EDT THU JUN 2 2016 Sub-tropical ridge axis remains parked over the central and northern part of the state. Given the placement of the ridge, the sea breeze should progress inland more rapidly from the Cape southward. A high sun angle will allow temps to warm rapidly this morning, into the low 90s over the interior. With ridge axis parked over the region, light winds will prevail except along the coastal terminals where diurnal sea breeze will increase onshore flow this afternoon.
1056 AM EDT THU JUN 2 2016 A weakening cold front will move through the region today into the overnight before stalling over southern Pa Friday.
A cold front moving out the north and an approachingupper level storms system from the west will keep widely scattered SHRA or TSRA across the forecast area. A stalled cold frontal boundary remains across southern MO early this morning. The cloud cover and precip will keep temperatures suppressed and have trended towards the cooler model solutions.
High pressure will remain in place across the region through the upcoming weekend resulting in dry and increasingly warm conditions. A ridge of high pressure centered over southern Nevada is providing Utah and southwest Wyoming with warm, dry conditions and sunny skies this morning. A weak surface cold front from this system will sneak into the far northern portions of the CWA this afternoon, but in general the impacts are expected to be minimal, with afternoon highs still running 10-15 degrees above seasonal normals today. This generally dry and stable airmass should remain in place through the next few days, as the ridge amplifies over the Great Basin.
A cold front will cross southeast Idaho this morning and bring strong west to southwest winds to the Upper and Lower Snake Plain. High pressure ridge builds in again on Friday, expect some cloud cover but mainly a nice day.
704 AM CDT THU JUN 2 2016 A weak cold front/stationary front was bisecting the CWA from southwest to northeast early this morning.
Upper low near the Big Bend of TX will continue to move slowly east. and slightly stronger low-level flow along the eastern periphery of the TX upper low will provide some enhanced lift as well. A northern stream upper low will shift into the Great Lakes region for the weekend.
With ridge axis parked over eastern Gulf Of Mexico, light winds will prevail except along the coastal terminals where diurnal sea breeze will increase onshore flow between 7 and 10 knots this afternoon. SW winds will increase to near SCEC levels this weekend due to nocturnal surges ahead of slowly approaching cold front.
1152 AM EDT THU JUN 2 2016 Cooler and drier air has settled across the region through Friday night.
725 AM EDT THU JUN 2 2016 Ridge of high pressure slides east of the North Country this morning followed by a weak cold front that will cross the area this evening into the first half of Friday with scattered showers and isolated thunderstorms.
616 AM CDT THU JUN 2 2016 Broad, disorganized and weak high pressure extends from the High Plains through the Mid MO Valley. Streaks of cirrus associated with the northern periphery of a rather large upper trough over TX will prevent us from seeing crystal clear skies.
1146 AM EDT THU JUN 2 2016 A cold front will clear the area this morning with slightly cooler and less humid conditions in store into Friday night.
734 AM EDT THU JUN 2 2016 A plume of warm and moist air will flow northward into Pennsylvania ahead of a relatively weak cold front.
The MCS should sustain itself through the morning hours as it moves eastward, in an increasingly divergent upper level pattern across South-Central Texas east of the approaching upper level low per current RAP analysis and forecast. We continue to stress the high potential for flash flooding and message Turn Around, Don't Drown. Behind the departing MCS, and after recovery, re-development of storms are possible this afternoon back through the Hill Country and Edwards Plateau, closer to the mid level trough axis. May be a brief lull in convective activity after sunset, with possible overnight re-development of isolated to scattered storms closer to the core of the mid and upper level low through central Texas and the Hill Country.
Weak cold front currently within our CWA is moving east-southeast and should be near the ID/NV border around noon MST. Saturday will start out mostly sunny but the next Pacific warm front will come in with a chance of light rain in northern areas Saturday afternoon.
The surface cold front was just entering northwest TN and will arrive between 12-15Z through the forecast area. Temperatures may fall a bit late this morning, then recover back into the lower to middle 50s for afternoon highs as sunshine returns. During the evening, forecast soundings indicate rapid cooling of mid levels with a near isothermal layer around 0C above 850 mb, while low levels stay above freezing during the evening hours.
556 AM CST Fri Mar 10 2017 /12Z TAFS/ A weak cold front will move across the northern terminals today, with winds becoming light northeast following FROPA. /issued 453 AM CST Fri Mar 10 2017/ (Today and Tonight) The main weather item today will be a weak cold front that will affect the northern half of the forecast area. Temperatures will be cooler today, especially north of the front. Highs will range from the low and middle 60s across the Big country, to the lower and middle 70s elsewhere. The front will lift back north as a warm front tonight, with low level moisture increasing. (Saturday through Friday) Models indicate a series of cold frontal passages across the forecast area.
Satellite imagery continues to show mid and high level clouds along an upper level trough to our south from Sonora to Big Bend country.
Cooler air will move over the area behind the front tonight, bringing around seasonal temps.
Cooler air will filter into the region tonight and Saturday, as high pressure builds into the Mid Atlantic.
532 AM CST Fri Mar 10 2017 Closed low over the Hudson Bay with broad trough into the Great Lakes Ridge amplifying over the western Conus.
938 AM EST Fri Mar 10 2017 High pressure will build into the region today bringing much colder temperatures.
With these, isolated showers were detected by the local Doppler radar affecting the waters south of the Lower and Middle Keys up to 25 nmi. Winds were from the northeast to east 10 to 15 knots and near 15 knots across the Straits and Hawk Channel waters west of the Lower Keys.
This is allowing for some drizzle or borderline freezing drizzle in areas ahead of the second band, and have added this for a couple of hours. Best PoPs from mid-morning on will continue to lie east of Pittsburgh with terrain enhancement aiding snow shower coverage, with best accumulation along the higher ridges southeast of the city. Upper troughing pattern will continue through the weekend with well below normal temperatures.
Saturday will be very similar again before the well advertised cold front comes through Saturday night.
1018 AM EST Fri Mar 10 2017 High pressure will build out of the Great Lakes today in the wake of the departing storm system.
608 AM EST Fri Mar 10 2017 Showers have cleared the area to the east with cold front approaching from the NW.
554 AM CST Fri Mar 10 2017 High pressure was centered over west central Manitoba early this morning with the ridge axis into the eastern Dakotas. This has led to warmer temps due to less radiational cooling which in turn has kept the wind chill values in the respectable range. The high center will be nearly stationary today through Friday. The ridge axis will be nearby tonight and Saturday and with neutral temperature advection, and a northwest flow aloft keeping 850mb temps in the teens to low 20s below zero celsius, surface temps will remain below normal today through Saturday. A ridge of high pressure at the surface will extend southeast over the Northland and that and dry air should keep most of the area dry despite the weak wave.
910 AM EST Fri Mar 10 2017 An Arctic cold front will move through Friday night, followed by bitter cold weather over the weekend.
453 AM CST Fri Mar 10 2017 (Today and Tonight) The main weather item today will be a weak cold front that will affect the northern half of the forecast area. Temperatures will be cooler today, especially north of the front. Highs will range from the low and middle 60s across the Big country, to the lower and middle 70s elsewhere. The front will lift back north as a warm front tonight, with low level moisture increasing. (Saturday through Friday) Models indicate a series of cold frontal passages across the forecast area.
The cold front was up across central Georgia, and will enter our region around 18Z this afternoon. Otherwise, west to southwest winds ahead of the front will lead to warm temperatures this afternoon in the lower 80s. Southwest winds 10-15 knots will become northwesterly this afternoon behind the cold front.
In addition, model soundings indicate an elevated melting layer associated with the warm frontal inversion may be strong enough to allow some freezing rain to mix with the snow, especially along and south of a Cut Bank to Lewistown line.
459 AM CST Fri Mar 10 2017 Cold front from last evening has pushed well east of the forecast area as of 08Z, with clear skies and brisk northwest wind in its wake. Winds become light tonight as ridge axis bisects the forecast area from northwest to southeast by 12Z Saturday. Saturday will remain under the influence of high pressure with slightly warmer temperatures and partly to mostly cloudy skies.
Another round of showers and thunderstorms is expected again late this morning and afternoon as the weakening mid-level low pressure system over Baja California slowly moves eastward.
These showers are associated with a cold front that's weakening as it moves through. On Saturday we expect that the coast and Douglas County will be most affected by one such low pressure wave.
Today Through Saturday Night A cold front will push to the south of Arkansas today. Behind the front, a large area of high pressure will start building from the upper Midwest toward the Ohio Valley. Clockwise flow around the high will produce breezy northeast winds. Temperatures in the north should dip to around freezing or a little below.
As for highs temps will be cooler across the plains with readings fm 55 to 60 over far ern areas with lower to mid 60s along the front range. For tonight a wk upper level trough will affect nrn Colorado late tonight. Shallow upslope behind tonight's cold front and neutral lapse rates will keep some chance of showers in the forecast into early Saturday morning. Enough cold air may sneak into the system for a few flakes of snow in the lower elevations but overall a quick moving system with subsidence building in fairly quickly. Cooler airmass over the area will keep daytime highs mostly in the 50s across the plains.
Chattanooga Airport, TN 63 33 50 32 / 10 0 30 80 Knoxville McGhee Tyson Airport, TN 57 30 42 28 / 20 0 30 80 Oak Ridge, TN 57 28 42 27 / 20 0 40 80 Tri Cities Airport, TN 53 24 38 27 / 40 0 40 80 TN.
606 AM EST Fri Mar 10 2017 An Arctic cold front will move through Friday night, followed by bitter cold weather over the weekend.
624 AM EST Fri Mar 10 2017 Building high pressure will bring much colder temperatures for today. High pressure will begin to build from the nw today, but H8 CAA should lower lapse rates and aid in the develop of stratocu this afternoon. They will range from the lower 30s in the north to a around 40 in nrn KY. High pressure will continue to settle down into the region from the northwest tonight. Due to the unseasonably warm temperatures of the past several weeks, some vegetation may be vulnerable to the freezing temperatures.
445 AM CST Fri Mar 10 2017 A ridge of Canadian high pressure centered across the region will slowly exit east through tonight, putting an end to the mainly dry weather.
Some light fog being reported in the San Joaquin Valley, Otherwise dry with temperatures warmer than yesterday. The storm track remains towards the Pacific NW leaving upper level high pressure the dominant weather feature over southern and central California.
This activity was developing well ahead of a southward moving cold front across Southern Arkansas and Southeast Oklahoma which will backdoor its way into our region from the north and east throughout the day. Terminals that become MVFR or IFR later this morning should become VFR once again during the late morning or afternoon hours in the wake of the backdooring cold front. /issued 459 AM CST Fri Mar 10 2017/ A cold front moving into the Red River Valley from the north brought a line of strong thunderstorms along an outflow invok frontal boundary, which have mostly diminished during the wee hours. A stronger cold front will move quickly across area later Saturday into Sat night.
639 AM EST Fri Mar 10 2017 Aviation The longest string of days in a row with highs at or below freezing since the first week of January will begin today in Southwest Michigan.
605 AM CST Fri Mar 10 2017 Much cooler temperatures are expected across central and southeast Illinois through the period. Max temps on Saturday will remain in the lower 30s.
509 AM CST Fri Mar 10 2017 Water vapor imagery shows an upper trough tracking across the Great Lakes region with additional energy coming on shore over the Pacific Northwest. This will further deepen the upper trough to our east, keeping unseasonably cool temps in place to start the work week. By 12z Tue, a deep upper trough will stretch from the Great Lakes down into the Tennessee Valley with a cool airmass remaining over the Plains. Fire danger concerns will remain on the low side over the next few days. Winds this afternoon will generally be out of the east and northeast at speeds in the 10 to 15 mph range with RH's on the higher side due to lower temps.
Skies will be clear through much of the day as strong high pressure approaches from the Northern Plains. Breezy northwest winds will ease a bit this evening and overnight as the ridge builds into southern Wisconsin.
432 AM CST Fri Mar 10 2017 Today through tonight: A loosely organized and diminishing mesoscale convective system over central/northern portions of the ArkLaMiss early this morning will continue to push south ahead of an approaching cold front. In the wake of the cold front, a temporary intrusion of dry air is expected to end rain chances as we go through late afternoon and the overnight hours. There will be just a glancing shot of cooler air behind the front, so temperatures will not fall too much, and they could actually remain a bit above climatic normal in many locations.