Aikyam-Lab/Synoptic-Bench huggingface dataset:
934 AM MDT Tue Sep 21 2021 Temperatures dropped notably this morning on the backside of the trough, with Denver recording a low of 39 F, the coolest temperature observed at the airport since May 12th. Much of the high valleys dipped into the teens, with Cowdrey and Hebron in North Park both recording lows of 14 F this morning. Skies will continue to clear through the morning as the trough exits and remain mostly sunny through Tuesday.
Chances for precipitation may return by the latter half of the week along with slightly cooler temperatures. A warm ridge of high pressure over the West Coast will move eastward and over Arizona through Wednesday continuing the dry and warm weather pattern. Cool temperatures will start off the day today, with perhaps a few cold spots in the high country reaching freezing this morning.
Temperatures will cool again tonight, but current thinking is lows overall will be a little warmer than this morning's due to winds gaining more of a southerly component (although winds will be light). Under the influence of upper level ridging, Wednesday is expected to be warmer with highs ranging from the lower 70s east to near 80 west. Warmer temperatures also mean lower relative humidity, with minimum humidity values expected to dip into the upper teens to low 20s across much of western into central North Dakota Wednesday afternoon. Temperatures will trend cooler through the end of the work week as an upper level low looks to drop southeastward out of Canada and into the Great Lakes region, swinging a cold front through the northern Plains.
Current radar and visible satellite shows dry conditions and clear to mostly clear skies across the region as an upper level ridge continues to build in from the southwest. Ridge intensity will peak today to allow for high temperatures to reach into the mid 70s to low 80s for lower elevations. Winds are expected to pick up through the Eastern Gorge and the Kittitas Valley Wednesday afternoon as a dry cold front moves through, with gusts between 25 and 30 mph possible.
(This evening through Wednesday) Cold front has made it through all of West Central Texas and brought breezy, cooler, and drier conditions to the area. Cooler air mass will remain in place with highs in the lower 80s. Lows in the lower to mid 50s are expected, but low lying or protected areas are likely to fall into the 40s.
Gusty north winds up to 20-30 mph will subside towards the evening hours becoming less than 10mph after sunset with radiational cooling and clearing skies as high pressure builds in across the high plains.
1230 PM CDT Tue Sep 21 2021 A cold front is moving SE through the state early this afternoon. Meanwhile, the main upper lvl trof wl swing thru the region late today and tngt, with some lingering post-fntl rain chcs in the fcst. Cooler and much drier airmass wl prevail for Wed.
Overall, upper level ridging will influence the region today, making for a dry day with temperatures largely in the 70s for the majority of the lowlands. A dry and warm Tuesday will give way to cloudier and cooler conditions for the start of fall on Wednesday.
An upper trough exiting to our east will allow an upper ridge to move in from the Pacific NW and provide a warm-up going into Wednesday. With a cold front approaching, models may be underplaying temps and humidity a bit Wednesday.
302 PM EDT Tue Sep 21 2021 Upper level trough will swing across the eastern U.
106 PM CDT Tue Sep 21 2021 Early morning satellite imagery shows the upper level trough continuing to swing through the region, as evident by upper level clouds off to the east streaming northwards while areas out west have them moving southeastwards. With no strong WAA or CAA to alter our airmass, temperatures today will remain on the cooler side with highs in the mid to upper 60s. With calm winds and clear skies, radiational cooling should bring temperatures down into the lower 40s. Weak ridging aloft further attempts to help warm temperatures up, but alas we'll likely only get to the lower 70s for areas east of I-29, while areas out west in central SD will get into the upper 70s where conditions will be a touch breezier.
Main band of convection associated with the cold front has exited the forecast area, although some post-frontal sprinkles are lingering across aparts of northeast OK. Have updated forecast to include a mention of sprinkles for the next few hours, otherwise expect clearing skies and much cooler afternoon temps.
An early season cold front has moved through Jonesboro, AR and most of the Missouri Bootheel. A line of showers and thunderstorms is developing well ahead of the front along a pre frontal trough. Cooler and drier conditions with low humidity will move in overnight. Temperatures are steady in the lower 70s with a light south wind. To our west, two MCSs are ongoing along the leading edge of a longwave trough. Both systems will move into the Mid-South this morning and afternoon, as the main trough pivots into the Mississippi Valley. The main push of showers and storms will be this afternoon, as the main trough begins to push into the Mid-South. Highs will be comfortably cool on Wednesday, with readings only in the lower 70s with a northwest breeze.
Temperatures remain fairly seasonably cool for today as trough axis moves eastward ushering in high pressure and drier conditions. The upper level ridge will continue to dominate the weather pattern overall, however a couple quick moving upper level short wave troughs will move through.
1052 AM PDT Tue Sep 21 2021 High pressure will keep the Inland Northwest warm and dry Tuesday.
208 PM MDT Tue Sep 21 2021 It's another quiet weather day across Colorado as the deep low pressure trough exits to the east. That trough has left cooler temperatures in its wake, with the thermometer remaining in the 60's for the plains where current temperatures are running 2 to 7 degrees cooler than this time yesterday.
1206 PM CDT Tue Sep 21 2021 (Today and tonight) The cold front has moved through all of the forecast area except Atoka and Bryan Counties this morning. Although temperatures are cooler and humidity is somewhat marginal this afternoon, the drying vegetation and strong winds are sufficient to produce RFTI values showing elevated fire weather conditions across southwest Oklahoma and western north Texas this afternoon. Otherwise, cooler weather is expected today and tonight behind this cold front. The high temperature forecast will be the coolest highs that we have seen since early June and forecast low temperatures will be the coolest temperatures since mid May in many areas.
Much warmer weather is in store for Central California Today.
A dry cold front will move through the region tomorrow night. After that a ridge remains in place over the region into the weekend. As that ridge progresses east, a deep trough develops over the eastern Pacific Ocean. Tomorrow, we'll see an increase in mid to upper level clouds and increasing westerly winds due to an approaching dry cold front.
Forecast/Details: Cool air will continue to funnel into northern Michigan through the near term with NW winds in place behind the cold front. Current temps in the low-60s across most areas will drop into the mid/upper- 40s later tonight under mostly cloudy skies.
More widespread showers and possible thunderstorms can be expected for Wednesday as a cold front approaches and crosses the region. trough will continue to fuel mostly light rain showers through the overnight period. The upper Midwest trough will continue to deepen and dig eastward into Wednesday as the warm moist southwest flow strengthens. A surface cold front, ahead of the occluding system will also cross the region Wednesday afternoon.
Showers and thunderstorms were ongoing across the area early this morning as a cold front was working through the area. The upper level trough was still located well northwest of the area, therefore showers and storms will continue behind the front through mid to late morning. Conditions should begin to dry out with clouds scattering by afternoon as trough moves overhead. Much cooler and drier air was located northwest of the area and this will build in through the day. Most locations will be a solid 20-25 degrees cooler than yesterday.
Drier air will continue to filter in late this morning and into the afternoon limiting rain chances before rain associated with a cold front approaches overnight. Ahead of a cold front, isolated showers will be possible at times and confidence on impacting any TAF site is low with PROB30 groups included to cover this potential. Diegan Chattanooga Airport, TN 63 71 52 71 51 / 80 80 10 0 0 Knoxville McGhee Tyson Airport, TN 64 71 50 69 48 / 60 90 10 10 0 Oak Ridge, TN 62 70 49 68 48 / 80 80 10 10 0 Tri Cities Airport, TN 62 72 49 67 45 / 40 90 40 10 0.
The upper level trough continues to exit to the east and will be replaced with high pressure.
332 PM CDT Tue Sep 21 2021 The early season cold front has finally arrived, and looks to be located just to the east of the Mississippi river, located along a line generally from Covington, TN to Memphis, to Tunica, MS. A prefrontal trough may result in a wind shift before the front. Behind the front a cooler and drier Fall-like airmass will move into the Midsouth.
A few showers are on going in the south and east with more shower development noted over the last hour in West Tennessee ahead of the much anticipated cold front.
155 PM PDT Tue Sep 21 2021 Dry and warmer weather this week.
(This evening through Wednesday) This morning's cold front continues to push southward into Texas this afternoon. In its wake, a drier and cooler airmass has settled into the region leading to quite a pleasant afternoon.
153 PM CDT Tue Sep 21 2021 A sprawling area of high pressure was located over the Central Rockies into the Plains and Midwest. This system has brought a much cooler and drier air mass into eastern Iowa and northwest Illinois. Quiet weather is expected tonight with lows in the low 50s across the east/southeast outlook area to mid 40s in the west. An area of low pressure is forecast to track through the Ohio Valley on Wednesday, which will increase the pressure gradient locally leading to another breezy day.
Numerous showers and thunderstorms this afternoon and evening, as a trough of low pressure lays west to east across region, and the east coast and gulf sea breezes move inland and collide. Lows in the lower 70s are expected. A cold front will move southeast into SE GA Wednesday morning, then slowly move southeast across forecast area Wednesday.
(Today through Wednesday afternoon) Currently, a cold front has moved through southeastern New Mexico and is located along a line from Guadalupe Pass to McCamey and Big Lake. Yesterday was almost certainly our last hundred degree day of the year here at MAF with this cold front bringing in temperatures that will struggle this afternoon to reach 80 degrees in most locations north of I-10.
Gusty northerly winds, as well as much lower temperatures and dew points, are prevailing this afternoon in the wake of last night's cold frontal passage.
Even with this activity and resulting cloud cover cooling temperatures a bit and putting a damper on today's highs for the Lower to Mid RGV, today will still be generally very warm and muggy with an onshore flow at the surface. the season's first cold front is on its way towards us! As of 2pm this afternoon, the cold front made it into south-central Texas. Rain chances will stick around through the morning and then will likely quickly taper off during the afternoon as the cooler and drier air filters in.
1133 AM MDT Tue Sep 21 2021 Temperatures have rebounded above freezing after sunrise, allowing the freeze warnings in the upper Colorado and Yampa River Valleys to expire.
1236 PM CDT Tue Sep 21 2021 (Today and tonight) A strong cold front has started to work it's way through the northern portions of our area from northwest to southeast, bringing a shift from warm southerly winds, to cool and gusty northeasterly winds this morning and afternoon. Expect cooler and mostly dry conditions today with high temperatures in the upper 70s to lower 80s, and overnight lows in the 50s.
The cold front is currently located from northeast Texas to across Arkansas to the Mississippi/Ohio river confluence and with a line of showers and storms along the boundary along with some scattered convection ahead of the front. VFR conditions prevail over the area until ceilings lower to IFR/MVFR in the wake of a cold front which moves through late tonight into early Wednesday morning.
116 PM CDT Tue Sep 21 2021 Upper level diffluence in advance of the approaching cold front will continue to produce thunderstorms across western TN into northern MS late this afternoon in a plume of MLCAPEs of 2000-2500 j/kg. Deeper mixing will yield gusts of 15-20kt through much of the day, with temperatures squeaking out 70-73 degrees in valley areas with sufficient sunshine, while staying in the middle to upper 60s at most atop the higher Cumberland plateau areas. Winds will diminish late Wednesday night sufficiently to allow temperatures to fall into the upper 40s in southern middle TN and the highest elevations of northeast AL, with around 50 expected in urban valley locations.
Seasonably strong/deep upper trough and associated cooler air aloft and steep mid-level lapse rates is providing enough lift and weak instability for a smattering of showers across mainly central and northern portions of Kansas this afternoon. Another beautiful fall-like day expected Wednesday, with forecast low-level thickness values supporting high temperatures once again in the 70s, along with light winds as high pressure continues to settle southeast across the region.
A few showers are on going in the south and east with more shower development noted over the last hour in West Tennessee ahead of the much anticipated cold front. Poor flying conditions (likely IFR or lower) will develop as a cold front is expected to move through the area overnight from the northwest to the southeast.
The cold front is near the Mississippi River with NNW winds west of the River. The cold front will move through our area overnight, but showers will continue post fropa due to the large upper low lingering behind the surface front. Some scattered showers are still expected on Wednesday as the upper low rides along the Ohio River Valley. By Wednesday evening, the upper low will be lifting north toward northern Ohio which will allow rain chances to finally come to an end. As far as the arrival of the cooler air, you will notice a difference tomorrow morning as temperatures will already be in the upper 50s to lower 60s.
218 PM EDT Tue Sep 21 2021 Synopsis/Discussion/Aviation/Marine - Heavy rain event into Wednesday as upper trough closes off Flood watch continues for the southeast forecast area as 2 to 4 inches of rain is possible in that area by Wednesday evening. Upper troughing closes off into upper low by 12Z Wednesday with surface cyclogenesis across the Ohio Valley. Even though the deeper convective rains move east of the forecast area tonight, deformation axis with strong mid level f-gen persists as the low moves north, resulting in moderate to heavy rain bands across the Watch area into Wednesday evening.
Showers and thunderstorms continue this evening ahead of the cold front that is just starting to move through the region. After a cold front moves through this evening into the overnight hours, northwest winds will pick up to be around 10 to 15 knots gusting up to 25 knots at times especially after midnight through the end of the TAF period.
658 PM CDT Tue Sep 21 2021 (This evening through Wednesday) This morning's cold front continues to push southward into Texas this afternoon. In its wake, a drier and cooler airmass has settled into the region leading to quite a pleasant afternoon.
Upper level diffluence in advance of the approaching cold front will continue to produce thunderstorms across western TN into northern MS late this afternoon in a plume of MLCAPEs of 2000-2500 j/kg. Deeper mixing will yield gusts of 15-20kt through much of the day, with temperatures squeaking out 70-73 degrees in valley areas with sufficient sunshine, while staying in the middle to upper 60s at most atop the higher Cumberland plateau areas. Winds will diminish late Wednesday night sufficiently to allow temperatures to fall into the upper 40s in southern middle TN and the highest elevations of northeast AL, with around 50 expected in urban valley locations.
838 PM CDT Tue Sep 21 2021 The cold front has officially reached the greater Memphis area. /issued 332 PM CDT Tue Sep 21 2021/ The early season cold front has finally arrived, and looks to be located just to the east of the Mississippi river, located along a line generally from Covington, TN to Memphis, to Tunica, MS. A prefrontal trough may result in a wind shift before the front. Behind the front a cooler and drier Fall-like airmass will move into the Midsouth.
224 PM PDT Tue Sep 21 2021 A cold front on Wednesday is expected to bring increasing clouds and breezy winds across portions of central and eastern Washington.
926 PM CDT Tue Sep 21 2021 Occasional showers will continue across portions of east central Illinois tonight and Wednesday as an upper low moves across the region. The upper Low should develop overnight, strengthening into a cut- off Wednesday afternoon over the Ohio River Valley.
426 PM CDT Tue Sep 21 2021 Through Wednesday: A cold front will be pushing through the region tonight with showers and thunderstorms expected along and ahead of this system. High pressure will begin building in across the region Wednesday with dry weather expected. Highs Wednesday will be cooler, ranging from the middle to upper 70s.
High pressure is overhead today, with mostly sunny skies and warm temperatures (5 to 10 degrees above normal). Tomorrow a cool front will arrive and bring increasing west to northwest winds and cooler temperatures to the forecast area.
Near Critical Fire Weather Conditions Expected Wednesday With a ridge moving across the area and a front approaching from the west, tomorrow looks like another day that will overachieve on temperatures and minimum RHs. An upper trough exiting to our east will allow an upper ridge to move in from the Pacific NW and provide a warm-up going into Wednesday. With a cold front approaching, models may be underplaying temps and humidity a bit Wednesday.
/86/ Prior discussion below: Through Wednesday: A cold front will be pushing through the region tonight with showers and thunderstorms expected along and ahead of this system. High pressure will begin building in across the region Wednesday with dry weather expected. Highs Wednesday will be cooler, ranging from the middle to upper 70s.
Dry air continues to filter into the area this evening behind the passage of the cold front last night. Gusty northerly winds, as well as much lower temperatures and dew points, are prevailing this afternoon in the wake of last night's cold frontal passage.
Short Term Update - Weak ridging will remain across Florida through the overnight period. A weak ridge across Florida will maintain light to gentle northeast to easterly breezes across Keys waters through the overnight period.
A listing of some of the higher totals will be released by storms report once activity diminishes further. Expect overnight lows in the low to mid 70s.
758 PM CDT Tue Sep 21 2021 A broad surface anticyclone over the central Rockies and Plains will continue to gradually build into the region thru Wednesday. Dry air continues to filter into the area this evening behind the passage of the cold front last night. Gusty northerly winds, as well as much lower temperatures and dew points, are prevailing this afternoon in the wake of last night's cold frontal passage.
645 PM CDT Tue Sep 21 2021 Summary: High pressure building in will lead to clearing skies, light winds and cold temperatures tonight. Frost is likely in many areas with some areas dropping below freezing. Broad cyclonic flow from an area of low pressure well to the northeast was bringing cloud cover to the Northland this afternoon. A large area of high pressure was situated across the western two-thirds of the CONUS and this will expand across the Northland overnight. A Frost Advisory remains in effect for much of northeastern Minnesota for tonight and a few areas along the Iron Range may fall to freezing or below.
513 PM MDT Tue Sep 21 2021 00Z TAF CYCLE Upper high centered over AZ and wrn NM. Surface lee trough developing by 22/13Z. Cooler, dry, and breezy conditions today will give way to warmer weather for the first day of fall on Wednesday.
354 PM PDT Tue Sep 21 2021 A cold front on Wednesday is expected to bring increasing clouds and breezy winds across portions of central and eastern Washington.
The strong upper trough over the Lower MS River Valley will induce cyclogenesis mainly in Ohio on Wed along the stalled n-s frontal zone. The low will occlude and retrograde into Lower MI Wed nt-Thu. The pressure gradient associated with the low will certainly maintain breezy nly winds especially over ern WI during this time.
216 PM PDT Tue Sep 21 2021 High pressure over Nevada tonight gives way to a cold front sweeping across the region Wednesday evening. Breezy conditions are expected Wednesday afternoon, but little or no rainfall will occur with the passing cold front.
/issued 332 PM CDT Tue Sep 21 2021/ The early season cold front has finally arrived, and looks to be located just to the east of the Mississippi river, located along a line generally from Covington, TN to Memphis, to Tunica, MS. A prefrontal trough may result in a wind shift before the front. Behind the front a cooler and drier Fall-like airmass will move into the Midsouth.
647 PM CDT Tue Sep 21 2021 Updated for 00Z aviation discussion 00Z TAF discussion: Showers and storms are ongoing this evening along and behind a cold front pushing through the region. /28/ Through Wednesday: A cold front will be pushing through the region tonight with showers and thunderstorms expected along and ahead of this system. High pressure will begin building in across the region Wednesday with dry weather expected. Highs Wednesday will be cooler, ranging from the middle to upper 70s.
452 PM CDT Tue Sep 21 2021 Summary: High pressure building in will lead to clearing skies, light winds and cold temperatures tonight. Frost is likely in many areas with some areas dropping below freezing. Broad cyclonic flow from an area of low pressure well to the northeast was bringing cloud cover to the Northland this afternoon. A large area of high pressure was situated across the western two-thirds of the CONUS and this will expand across the Northland overnight. A Frost Advisory remains in effect for much of northeastern Minnesota for tonight and a few areas along the Iron Range may fall to freezing or below.
617 PM CDT Tue Sep 21 2021 Occasional showers will continue across portions of east central Illinois tonight and Wednesday as an upper low moves across the region. This afternoon, a slow moving cold front has pushed east of central Illinois into Indiana. This feature is expected to deepen into a closed mid/upper low Wednesday as it cuts east across the mid Mississippi Valley. The greatest chance will again be across portions of east central Illinois which will be immediately ahead of the upper low during peak heating. Would not rule out a funnel cloud or two associated with any showers forming under the upper low.
635 PM CDT Tue Sep 21 2021 (This evening through Wednesday) Cold front has made it through all of West Central Texas and brought breezy, cooler, and drier conditions to the area. Cooler air mass will remain in place with highs in the lower 80s. Lows in the lower to mid 50s are expected, but low lying or protected areas are likely to fall into the 40s.
More widespread showers and possible thunderstorms can be expected for Wednesday as a cold front approaches and crosses the region. The upper Midwest trough will continue to deepen and dig eastward into Wednesday as the warm moist southwest flow strengthens. A surface cold front, ahead of the occluding system will also cross the region Wednesday afternoon and evening.
An approaching trough is expected to impact the forecast area tomorrow.