Aikyam-Lab/Synoptic-Bench huggingface dataset:
1234 AM CDT Wed Sep 4 2019 A surface cold front advanced south through south central Nebraska this morning and was located in north central Kansas early this afternoon. Cooler, drier air will settle in behind the boundary as we head into tonight and air conditioners can take a break as temps drop into the 50s for overnight lows. Warm air continues to expand north Thursday as the upper ridge axis builds north over the Rockies and the central/southern plains, allowing temps to heat up again.
This is due to an expanding upper ridge, which up until now has remained centered to our west. However, the strengthening ridge will be sufficient to overspread most of the Southern Plains with subsidence for the next several days, while keeping skies mostly sunny. South of the ridge axis, easterly flow will continue to steer Tropical Storm Fernand westward into northern Mexico, and this system will have no direct effects on our sensible weather.
913 PM PDT Tue Sep 3 2019 High pressure over the southwest will bring hot, humid weather this week with scattered afternoon showers and thunderstorms over the mountains and deserts. The weather will turn cooler and less humid this weekend, with an increased marine layer presence, as a trough of low pressure moves inland over the West Coast. Wednesday will probably be the hottest day this week when daytime highs will reach 108-112 degrees in the lower deserts. This is a contributing factor to the high humidity in the coastal zones. A pattern change will bring cooler, drier weather to Southern California this weekend.
Elsewhere, a mid to upper-level anticyclone was situated over the central and southern Rockies while a prominent vorticity lobe was moving onto the British Columbia and WA coasts. In the low levels, a cold front attendant to the Great Lakes upper-air system stretched from central IA into northwest KS, or generally along a Red Oak, IA to Seward, NE line as of 2:30 PM. By Wednesday night into Thursday, the vorticity lobe currently along the British Columbia and WA coasts -after having crested the expansive ridge over the Rockies- will progress from southern Saskatchewan and Manitoba into the upper Great lakes, encouraging the movement of another cool front toward the area.
Otherwise, highs will climb into the lower to middle 90s, with heat indices only a few degrees higher due to the presence of drier air being channeled around the western edge of Dorian.
1124 PM CDT Tue Sep 3 2019 The cold front currently moving through north central and western KS this afternoon will make making its way SSE down to northern Oklahoma by daybreak wednesday. The upper ridge that has brought northwesterly midlevel flow over the area will continue for the next couple of days bringing quiet dry conditions to the area. Slightly cooler, seasonable temps can be expected tomorrow behind the cold front with highs in the mid to upper 80s.
A quiet and dry day is expected with high pressure expected to push overhead by the late afternoon. Mostly light and variable winds throughout the day though it will be cooler with highs only reaching the mid 60s to low 70s.
For Wednesday, the ridge will encounter the effects of Tropical Storm Fernand and come in weaker than previous forecasts were suggesting with a continued downward trend for high temperatures on Wednesday. With a weaker upper level ridge and partly cloudy skies, temperatures should hold in the low to mid 90s tomorrow, instead of the upper 90s to triple digits that we were originally forecasting.
Winds will lighten slightly overnight with the lack of daytime heating but with the pressure gradient tightening between the hurricane and high pressure to the west, they will stay around 5- 10MPH. A very tight moisture gradient from west to east continues tonight but cloud cover should diminish into the overnight hours with some clouds lingering in the east where the highest moisture is. Lows will be in the lower to mid 70s. Hurricane Dorian will continue to move northward between two upper ridge axis and be steered northeastward by a trough moving across the Great Lakes region. Overnight lows will fall into the low to mid 70s.
306 AM CDT Wed Sep 4 2019 Water vapor imagery was showing an upper level high pressure dome encompassing the western half of the CONUS with attendant ridge extending well into western Canada. At the surface, high pressure was centered over SD with the leading edge of a cold front extending roughly from southern IL to northwest KS. Did note though a cold front making a push through the CWA Thursday night. On Thursday, much warmer with highs topping out in the low 90s.
400 AM CDT Wed Sep 4 2019 While much of the attention on the wx map is focused on tropical systems Dorian to our east and Fernand to our southwest, the feature primarily in control of our weather at the moment is high pressure centered over the Appalachians and ridging wswwd. Water vapor imagery shows mid/upper-level ridging in place from the wrn Gulf region through the TX/OK Panhandles to the Rockies. Likewise regional 88Ds are generally PPINE with the exception of scattered shower activity associated with the outer bands of Fernand off the lower/cntl TX coast. A quiet weather pattern in place thanks to the ridging aloft looks to linger through the first few days of this forecast period.
Temperatures will range from the low 70s in the Turtle Mountains and James Valley to the lower 90s southwest.
Latest near term model guidance suggests that the southwestern flank of a shearing 500-mb trough ejecting east-northeastward across New England will sag southward into the TN Valley early Wednesday morning. Wednesday should be fairly similar to today as weak high pressure remains over the region. An approaching upper-level trough and dry surface front will bring milder temperatures and lower dew points on Thursday. This means overnight temperatures Wednesday night into Thursday may only be a couple degrees cooler than what we see tonight, but temperatures just won't climb as high Thursday afternoon.
Thursday continues to look like the hottest day of the period as 850 MB temps will spike ahead of an approaching cold front.
A weak and moisture starved cold front will sag southward through the area later today and tonight.
Early this morning, a center of low pressure is centered over eastern Ontario with a surface cold front extending from Detroit to Indianapolis to St. In fact, the forcing is so weak that the cold front has slowed to a crawl. Since the Ozarks region is quite displaced from the main mid- level forcing, which is currently lifting across the eastern Great Lakes, confidence is high that the cold front won't cross the Missouri/Arkansas state line until late tonight.
313 AM CDT Wed Sep 4 2019 Post-frontal convection developed a bit further north and later than expected with slower southward movement of the weak cold front. Otherwise, modestly cooler air will advect south behind the front, which should eventually make it into far northern Oklahoma by midday.
Some of the cooler locations this morning could see the upper 30s before we warm into the upper 60s to lower 70s this afternoon. Instability will be limited and with cooler air at the surface, will remain trapped within the rather small EML above 750 mb.
A cold front will move through the area this morning, and in its wake, cooler and drier conditions can be expected much of the rest of the week.
159 AM MDT Wed Sep 4 2019 Water vapor shows upper ridge axis building from the Northern Rockies into the Northern Plains, with upper low over southern BC. Very warm and dry conditions expected today with thermal ridge peaking in our western zones. Highs close to the mid 90s expected in northeast WY and parts of far western SD, and a tad cooler east. Breezy southerly winds expected on the SD plains, with winds turning southwest/west across northeast WY behind surface trof. Slightly cooler temps expected Thursday with northerly winds behind surface trof.
/Today through Thursday/ The upper level ridge centered over the OK and TX Panhandles will continue to extend into the Four State Region but strengthen slightly as we push into Thursday. Temperatures will reach the mid 90s today and will increase into the upper 90s by tomorrow as the upper level ridge builds in. But, heat indices will be in the lower 100s for Thursday and will increase from west to east as dewpoints increase tomorrow.
The forecast area will remain on the eastern edge of an upper level ridge thru the period. A relatively weak cold front will push into the area on Wednesday, with some reinforcing drier air and a more notable wind shift on Thursday.
This, paired with highs in the lower to mid 80s and somewhat lower humidities, should make for a pleasant day.
Generally quiet conditions expected with the frontal passage this afternoon and evening due to significant dry air through the majority of the profile and lack of upper support; however, a few isolated, elevated showers/storms could pop up on the elevated 700 hPa cold front tonight where instability is based. Briefly cooler temperatures are expected in the wake of the cold front Wednesday; however, temperatures will quickly return to the upper 80s to near 90 Thursday as the ridge strengthens over the western CONUS.
1200 AM EDT Wed Sep 4 2019 A cold front over the Great Lakes will push southeast across Pennsylvania Wednesday. High pressure will then build into the area for the rest of the week. The focus for late tonight will be on an approaching cold front over the Grt Lks. Min temps are expected to be mostly in the low to mid 60s. 18Z models indicate the cold front will push through the northwest counties between 13Z-16Z and clear the southeast counties by 00Z. As noted above, cold front moving faster on Wed. Mainly dry weather expected for Thu and Fri as high pressure builds into the area.
315 AM EDT Wed Sep 4 2019 Updated at 302 AM EDT Wed Sep 4 2019 A cold front stretching from Detroit to Saint Louis early this morning will continue to push southeastward across southern Indiana and central Kentucky today. This afternoon dew points around Lake Cumberland, ahead of the front, will be in the lower 70s while behind the front in southern Indiana readings will drop to around 60. Tonight high pressure advancing from Wisconsin to Michigan, and ridging southwestward into Texas, will provide us with clear skies, a light north breeze, and low temperatures around 60 degrees.
short term models are in good agreement that a cold front seen draped along I-70 to the north will pass through the Midsouth late today. Unfortunately FROPA will take place after peak heating for most so expect afternoon highs to creep back into the low to mid 90s and heat indices near 100F.
The center of the high pressure will begin to shift overnight Wednesday and throughout Thursday. As a result of the shift in the high pressure center, the mid-level flow will become more southerly over northern Arizona. This change, combined with decreased instability will limit areas of convection to the high terrain again Thursday.
145 AM EDT Wed Sep 4 2019 A cold front will cross southeast through the region this morning. High pressure will build behind it and keep a dry and comfortable airmass over the Ohio Valley for the remainder of the week and into the weekend. Convection ahead of a cold front has been weakening as it heads east southeast. They will range from the mid 70s in the northwest to around 80 in the I-71 corridor, to the lower 80s in KY and far srn OH. Expect highs Thursday from the lower 70s north to the upper 70s south.
354 AM CDT Wed Sep 4 2019 The cold front that moved into northeast KS yesterday continued to progress southward through east-central KS overnight. Aloft, an expansive mid- level ridge stretches from the Four Corners region eastward over much of KS, OK and northern TX, with troughing over the Great Lakes. Temperatures should also be noticeably cooler than yesterday with highs topping out in the low 80s for much of the forecast area, but a touch warmer for locations in central KS. The surface boundary located south of the area will begin to lift back northward as a warm front tomorrow as an area of low pressure advances across the Dakotas and into Minnesota. Return flow will allow for the advection of warmer air and higher dewpoints into the area.
1206 AM EDT Wed Sep 4 2019 Scattered showers will accompany a crossing cold front this morning. Showers and some isolated thunderstorms will be possible through the morning as a cold front crosses. Residual convection will cease with frontal passage as high pressure begins to build and dry advection ensues. Seasonably cool temperature is progged to moderate early next as flow veers in response to upstream troughing. VFR conditions are expected until the passage of a cold front this morning. A period of MVFR stratocu cigs is expected just after FROPA as the low levels moisten. A clearing trend is expected tonight under building high pressure. No sgfnt restrictions expected, outside of localized morning fog, under general high pressure.
Updated at 302 AM EDT Wed Sep 4 2019 A cold front stretching from Detroit to Saint Louis early this morning will continue to push southeastward across southern Indiana and central Kentucky today. This afternoon dew points around Lake Cumberland, ahead of the front, will be in the lower 70s while behind the front in southern Indiana readings will drop to around 60. Tonight high pressure advancing from Wisconsin to Michigan, and ridging southwestward into Texas, will provide us with clear skies, a light north breeze, and low temperatures around 60 degrees.
The nose of an upper level ridge of high pressure extending eastward to Alabama from southern Colorado will become flatted and shift southward in response to Hurricane Dorian tracking northward near the southeastern Atlantic coast.
An upper-level area of high pressure will be centered near the panhandle of Oklahoma today through Thursday. Farther west, a trough of low pressure aloft will remain just offshore of the west coast of the United States today through Thursday. The aforementioned upper-level trough of low pressure will move inland over the Pacific Northwest Thursday night.
In addition the breezy onshore flow will support a high risk for rip currents along area beaches for the next couple of days so will extend the High risk of rip currents through Thursday evening.
An area of high pressure building over northern Alabama and extending west into Oklahoma will keep it hot again today. However, likely not until the late afternoon hours based on satellite trends, so this shouldn't keep highs from topping out a tad warmer than yesterday. Though dewpoints could drop into the lower 60s after midnight, think that winds should keep lows from dropping below the mid to upper 60s. Thickness values and 925 mb temperatures both show a cooler day on tap with highs only reaching the mid to upper 80s.
634 AM CDT Wed Sep 4 2019 As of 1 am CDT, a very diffuse pre-frontal trough was bisecting the WFO PAH forecast area from west to east, with the primary surface frontal boundary (depicted by wind shift, dewpoint/temperature drop, linear cumuliform cloud bases via satellite) remaining just north of the forecast area. The mixing and scouring out of low level moisture will be slow, with dewpoints not dropping completely into the lower and middle 60s until late Wednesday night.
/Issued 326 AM CDT Wed Sep 4 2019/ Hot and dry weather will be the rule the remainder of the week and into the weekend as upper ridging holds. Expect highs back into the lower/mid 90s with heat index values around 100F in a few spots.
549 AM CDT Wed Sep 4 2019 High pressure will keep VFR conditions at all sites throught the forecast period. Winds will become calm tonight as the upper level ridge moves more into our area. /Today through Thursday/ The upper level ridge centered over the OK and TX Panhandles will continue to extend into the Four State Region but strengthen slightly as we push into Thursday. Temperatures will reach the mid 90s today and will increase into the upper 90s by tomorrow as the upper level ridge builds in. But, heat indices will be in the lower 100s for Thursday and will increase from west to east as dewpoints increase tomorrow.
517 AM CDT Wed Sep 4 2019 Early this morning a cold front has dropped through the forecast area ushering much cooler and drier air. Otherwise high pressure will build into the area today making for pleasant early September conditions with highs in the mid 70s to lower 80s. Thursday, high pressure will shift off to the northeast and warm air advection will help temperatures rise into the lower 80s east to upper 80s west. Thursday night a upper level trough moving through the western Great Lakes will forecast a weak front through the CWA.
/issued 315 AM CDT Wed Sep 4 2019/ The upper high is currently situated overhead and will continue supplying warm and dry conditions into the weekend.
644 AM CDT Wed Sep 4 2019 /12Z TAFs/ High pressure will continue to dominate across the region and VFR will prevail with light easterly winds below 10 knots. This is due to an expanding upper ridge, which up until now has remained centered to our west. However, the strengthening ridge will be sufficient to overspread most of the Southern Plains with subsidence for the next several days, while keeping skies mostly sunny. South of the ridge axis, easterly flow will continue to steer Tropical Storm Fernand westward into northern Mexico, and this system will have no direct effects on our sensible weather.
530 AM CDT Wed Sep 4 2019 Corrected the High Temperatures for Today.
Post-frontal convection developed a bit further north and later than expected with slower southward movement of the weak cold front. Otherwise, modestly cooler air will advect south behind the front, which should eventually make it into far northern Oklahoma by midday.
552 AM CDT Wed Sep 4 2019 The cold front that moved into northeast KS yesterday continued to progress southward through east-central KS overnight. Aloft, an expansive mid- level ridge stretches from the Four Corners region eastward over much of KS, OK and northern TX, with troughing over the Great Lakes. Temperatures should also be noticeably cooler than yesterday with highs topping out in the low 80s for much of the forecast area, but a touch warmer for locations in central KS. The surface boundary located south of the area will begin to lift back northward as a warm front tomorrow as an area of low pressure advances across the Dakotas and into Minnesota. Return flow will allow for the advection of warmer air and higher dewpoints into the area.
320 AM MDT Wed Sep 4 2019 Warm and dry conditions are expected for today, though expect a cold frontal passage to take place during the late morning and early afternoon hours.
1003 AM EDT Wed Sep 4 2019 A cold front will move across the region this morning.
A dry cold front will bring gusty westerly winds up to 20 to 30 mph this afternoon, mainly across western Montana and Lemhi County, ID. The highest gusts will be in the higher terrain along the Continental Divide.
553 AM MDT Wed Sep 4 2019 The center of the high pressure area aloft over the western U. A short wave through aloft moves eastward through southwest Canada and through the apex of the upper ridge today with a series of waves moving along the U.
Broad mid-level ridging over the southern high plains will expand north across the western high plains through Thursday. This will lead to gradually warmer temperatures through the short range. Meanwhile, a s/w will top the ridge and move southeast toward the Great Lakes tonight and early Thursday.
Dry and Slightly Cooler. Rain chances, for the next 24 hours, are near zero; however, models indicate the upper ridge may continue to weaken slightly, and this may produce slightly cooler temperatures. Model MOS guidance data indicate highs today and lows tonight will still be warmer than those usual for early September; but, they'll likely be closer to our usual temperatures.
Latest forecast still has the upper-level trough picking up Dorian and lifting it north and skirting the North and South Carolina coastline before continuing out to sea to the northeast. High pressure remains over northern Alabama and southern Tennessee. Though dewpoints could drop into the lower 60s after midnight, think that winds should keep lows from dropping below the mid to upper 60s. Thickness values and 925 mb temperatures both show a cooler day on tap with highs only reaching the mid to upper 80s.
624 AM CDT Wed Sep 4 2019 Water vapor imagery was showing an upper level high pressure dome encompassing the western half of the CONUS with attendant ridge extending well into western Canada. At the surface, high pressure was centered over SD with the leading edge of a cold front extending roughly from southern IL to northwest KS. Did note though a cold front making a push through the CWA Thursday night. On Thursday, much warmer with highs topping out in the low 90s.
75 inches as subtropical moisture moves in from the south as the high pressure ridge shifts eastward. Expect a little bit better coverage of afternoon storms today, mainly over the high terrain.
338 AM MDT Wed Sep 4 2019 The center of the high pressure area aloft over the western U. A short wave through aloft moves eastward through southwest Canada and through the apex of the upper ridge today with a series of waves moving along the U.
During this time nearly unidirectional westerly flow will decelerate, as large scale ridging is reintroduced to the tropospheric column from the top down.
649 AM EDT Wed Sep 4 2019 A cold front will move across the region this morning.
522 AM MDT Wed Sep 4 2019 Water vapor shows upper ridge axis building from the Northern Rockies into the Northern Plains, with upper low over southern BC. Very warm and dry conditions expected today with thermal ridge peaking in our western zones. Highs close to the mid 90s expected in northeast WY and parts of far western SD, and a tad cooler east. Breezy southerly winds expected on the SD plains, with winds turning southwest/west across northeast WY behind surface trof. Slightly cooler temps expected Thursday with northerly winds behind surface trof.
An area of high pressure will begin to build into the region for the end of the week. As the upcoming weekend approaches, the area of high pressure located over the western Atlantic will continue to dominate the weather patten across South Florida.
1224 PM CDT Wed Sep 4 2019 Post-frontal convection developed a bit further north and later than expected with slower southward movement of the weak cold front. Otherwise, modestly cooler air will advect south behind the front, which should eventually make it into far northern Oklahoma by midday.
354 PM EDT Wed Sep 4 2019 It will be mostly clear to partly cloudy overnight and noticeably cooler with morning lows generally in the 50 to 55 degree range. Cool and dry weather will continue Thursday with highs in the lower to middle 70s.
1122 AM CDT Wed Sep 4 2019 A cold front currently located over Southeast Missouri will begin to push into the Mid-South late this afternoon into the evening hours. short term models are in good agreement that a cold front seen draped along I-70 to the north will pass through the Midsouth late today. Unfortunately FROPA will take place after peak heating for most so expect afternoon highs to creep back into the low to mid 90s and heat indices near 100F.
244 PM EDT Wed Sep 4 2019 A cold front will push southeast across Pennsylvania later today. High pressure will then build into the area for the rest of the week. The cold front as of about 2PM extended from around BGM down just west of UNV down to near LBE. Temps will be pleasantly cool and about 5-6 deg below normal with afternoon maxes in the upper 60s across the high terrain of the north and west, and low to mid 70s throughout the Central and SE valleys. Mainly dry weather expected to continue on Fri under a ridge of high pressure to the NW of Hurricane Dorian that will be east of the Delmarva Coast.