Aikyam-Lab/Synoptic-Bench huggingface dataset:
Winds will become southerly tonight with circulation around the high and this will bring some increase in low level moisture. The increasing dew points should offset somewhat the good radiational cooling and allow temperatures to be a few degrees warmer tonight with lows generally expected in the 30s across most valley locations. Chattanooga Airport, TN 39 60 41 57 / 0 10 10 0 Knoxville McGhee Tyson Airport, TN 36 59 41 54 / 0 10 10 0 Oak Ridge, TN 36 59 41 54 / 0 10 10 0 Tri Cities Airport, TN 31 57 38 52 / 0 10 10 10.
Surface lee trof has developed over the Central Plains this morning, keeping winds up overnight and holding lows up in the 40s. Impacts on sensible weather are generally breezy conditions, with highs rising into the lower to middle 60s this afternoon, and another night of a mixed boundary layer keeping lows in the 40s.
1240 PM EST Mon Nov 20 2017 The cold front that came through this morning has stalled just south of the Keys.
200 PM PST Mon Nov 20 2017 High pressure aloft along the West Coast will bring unseasonably warm weather this week and mostly clear skies except for periodic high clouds.
323 PM EST Mon Nov 20 2017 High pressure will prevail into Tuesday.
A cold front will move across the terminals just beyond the forecast end time, switching winds around to the north and becoming very gusty for the afternoon.
The next batch is several hundred miles away under an upper ridge over W TX and will arrive in the Western sky for sunset and overnight. /issued 320 AM CST Mon Nov 20 2017/ WV imagery this morning shows synoptic scale upper trof departing off of the East Coast, as another disturbance undercutting the upper ridge present across much of the wrn CONUS shifts ewd into the srn Plains. Trof will continue to deepen just to our e, leaving us under dry nw flow aloft.
A dry cold front will push through late Tuesday afternoon into the evening.
1217 PM CST Mon Nov 20 2017 100 AM CST High pressure is across the Ohio/Tennessee valleys early this morning, with low pressure digging southeast across the Canadian prairies. The high will only slowly shift to the mid Atlantic today, while the low will deepen as it moves toward Lake Superior. The low will continue through Canada just to the north of Lake Superior, therefore breezy southwest winds will continue, and with some increasing clouds overnight lows will hold in the mid to even upper 30s.
Highs have warmed into the low/mid 50s, with seasonable norms this time of year around 62 degrees. The high level moisture over the region will shift slowly eastward this evening, as a trough in the more northern stream amplifies as it heads ESE across the Northern Plains. The above noted disturbance to our NW will result in amplification of the northern stream trough. The amplifying trough will help drive a dry cold front across the Tennessee Valley Tuesday night, bringing more cold air back to the region for the mid week.
249 PM EST Mon Nov 20 2017 High pressure moves off the Mid Atlantic coast tonight and Tuesday.
A cold front will bring a wind shift late tonight into Tuesday morning with north winds increasing by end of forecast, especially across western sites. A cold front will bring a wind shift to northwest Oklahoma after 6Z Tuesday. A cold front will also move across the area on Tuesday, with breezy northerly winds developing behind the front.
An upper level trough will shift east overnight while deepening slightly overnight with the axis remaining to the west of the forecast area across the lower Mississippi Valley. Low level moisture, generally below 700mb, will gradually increase overnight as the high pulls further east resulting widespread low level cloudiness. Overnight clouds will hamper the radiational cooling that allowed temperatures to drop into the 30s last night so tonights lows will be significantly warmer with readings in the upper 40s to lower 50s.
240 PM EST Mon Nov 20 2017 High pressure today yields to southwest flow tonight and Tuesday. Cold front crosses Tuesday night. High pressure again through Thanksgiving.
We may see a bit of light rain on Tuesday along and ahead of a cold frontal passage.
1014 AM MST Mon Nov 20 2017 Update to advance the high wind warning to now as winds have come up over more of Laramie County. Upper low visible on water vapor imagery this morning tracking across northern Montana and as expected, winds are really going to town out west. Dry, mild and windy for the holiday with brisk northwest flow aloft and decent surface lee troughing.
Amid some scattered virga showers over the northwestern and central zones of NE Montana, strong and gusty winds, associated with a potent cold front have pushed through the region today. The high temperature today was recorded during the latter morning hours, after which, temperatures began to steadily drop from north to south with the advance of this cold front. This cold spell, associated with a pronounced low pressure trough from the Canadian prairie, will be relatively short-lived for NE Montana.
210 PM EST Mon Nov 20 2017 High pressure over the area today will shift offshore late tonight and into the day on Tuesday. A weak low pressure will develop off the Florida coast on Tuesday, and then track quickly northeastward along the Southeast coast Tuesday night.
The next batch is several hundred miles away under an upper ridge over W TX and will arrive in the Western sky for sunset and overnight.
A strong short wave trough will dive south-southeast through North Texas Tuesday afternoon and then to the Texas coast late Tuesday night. There will also be increasing low level convergence along the coast in advance of the next cold front that will move through the area during the overnight hours Tuesday night. The short wave trough will interact with available moisture to produce scattered showers and isolated thunderstorms from the coastal plains into the coastal waters.
344 PM CST Mon Nov 20 2017 For the 24-36 forecast period, quasi zonal flow will transition to more amplified western CONUS ridge and eastern CONUS trough set up. Due to the zonal to slightly northwest flow over the Rockies, a lee trough has become more active and intensified allowing for the stronger surface to upper level winds to set up over the region. This will help push a cold front into the area after midnight and pushing through much of the forecast areas of northeast and east central KS by sunrise.
1000 AM PST Mon Nov 20 2017 High pressure aloft along the West Coast will bring unseasonably warm weather this week and mostly clear skies.
A cold front is expected to shift winds to the northwest after 06z then north after 12z. A cold front is on track to sweep across the Panhandles late tonight into Tuesday morning. While our temperatures will run roughly ten degrees cooler compared to Today's highs, we will still be a few degrees above average for late November.
but still thinking that the better rain chances will be during the after- noon tomorrow as a strong cold front approaches from the north. Models indicating the development of a highly amplified upper ridge out west, which should keep a fairly deep/dry NW flow in place over SE TX through the rest of the week (and into the weekend). Mostly clear skies along with highs in the mid 60s and lows in the lower 40s are on tap. Another cold front forecast on Sat should be mostly dry given the lack of return flow/moisture. The next cold front is expected to push off of the coast Tuesday night.
High pressure will begin to build in over the region tomorrow with heights and thicknesses increasing.
The pcpn is coming in with a warm front. Tuesday will be warmer than today with rising snow levels.
High pressure will move east today. A dry cold front will pass through the region Tuesday.
1045 AM MST Mon Nov 20 2017 Update to advance the high wind warning to now as winds have come up over more of Laramie County. Upper low visible on water vapor imagery this morning tracking across northern Montana and as expected, winds are really going to town out west. Dry, mild and windy for the holiday with brisk northwest flow aloft and decent surface lee troughing.
The pattern aloft featured west to northwest flow, while farther upstream a clipper system and associated cold front was translating southeast from Alberta. Otherwise look for cooler and windy conditions heading into Tuesday behind the cold front.
1240 PM EST Mon Nov 20 2017 High pressure will prevail into Tuesday.
Even in areas with snow cover still (I-80 to the north and in the ridges), where temperatures were really held in check this afternoon, increasing southerly flow will likely mitigate the chance of a legitimate cratering of temperatures. That said, due to lower than normal afternoon temperatures, most of the area will again at least challenge or drop below freezing. Given the short duration of lifting and quick dryout, accumulation should be limited to the north and ridges and be fairly light with less than an inch expected even in the highest accumulating areas. Fries More active conditions look to return into the extended as a longwave trough starts to become established over the eastern CONUS.
The strong cold front extending from the clipper across southeast Manitoba has cleared all of western and central North Dakota as of 21 UTC. A much colder Tuesday is expected area wide as cold high pressure builds across western and central North Dakota in the wake of the cold front today.
High clouds from that system can be seen getting picked up by northwest flow aloft from the large ridge of high pressure over the Southwest, providing a thin veil of cirrus across West Texas. High temperatures have been left unaffected due to enough filtered sunshine and dry airmass at the surface with dewpoints on the single digits and teens on the Caprock, into the low 20s just to the east off the Caprock. Short wave trough later tonight will help reinforce a surface cold front expected to move south out of the Texas Panhandle early Tuesday morning and through the South Plains by early afternoon.
A cold front is expected to swing through the area on Tuesday, bringing in a cooler airmass.
Ridging will build north out of Baja California into the Intermountain West and the Canadian Rockies thru the first half of the week. In its wake a cold front will clip the CWA late Tuesday.
347 PM EST Mon Nov 20 2017 High pressure moves off the Mid Atlantic coast tonight and Tuesday.
255 PM CST Mon Nov 20 2017 Not much change to forecast trends during the period with timing of cold front tonight the main concern. A cold front was pushing into western parts of the Dakotas at 20Z with surge of warm air out ahead of the front over the central plains.
253 PM EST Sat Nov 25 2017 A cold front exits this evening with limited moisture. Cooler Sunday. A weak cold front will cross the area through tonight. No precipitation is expected across the lowlands. Models show H850 temperatures reaching minus 4C over the higher elevations northeast mountains overnight, ranging to 1C across the extreme southern sections.
A warm front is moving through the forecast area from southwest to northeast this morning bringing light precipitation and plenty of cloudiness. Winds and seas will be relatively calm through this morning as high pressure remains over the coastal waters.
Gusty northwest winds will diminish this evening as high pressure continues to slowly approach the area.
/issued 446 AM CST Sat Nov 25 2017/ /12Z TAFS/ At 1100Z a cold front extended just north of KABI to just south of Sweetwater to Big Spring. /issued 415 AM CST Sat Nov 25 2017/ (Today and Tonight) At 0945Z the cold front extended from Stamford to Roby to Colorado City. May see areas of frost and temperatures dropping into the lower to mid 30s in river valleys and low lying areas.
1146 AM CST Sat Nov 25 2017 A cold front will continue to move south through southern Arkansas this afternoon. A cold front will continue to move south through the state this Sat. Today Through Sunday Night A weak cold front is dropping south into the CWA early this Sat morning. This will result in temps a few deg cooler than seen on Fri for highs. with maybe a deg or two cooler.
200 PM EST Sat Nov 25 2017 A dry cold front will cross our region late this evening into early Sunday morning.
120 PM EST Sat Nov 25 2017 A cold front approaches from the Ohio Valley today, then crosses the area tonight.
1114 AM CST Sat Nov 25 2017 Updated aviation section for the 18Z TAF issuance A cold front will move through the area from 09Z to 14Z this morning.
Clouds will continue to increase as a warm front lifts northward across southeast Oregon and southwest Idaho today. High clouds over the area with upper ridge in western Oregon. Warm front will move through Oregon from sw to ne bringing light rain to Baker County and the west central Idaho Mountains today and tonight. Rain will develop again in the Boise Mountains and west central Idaho Mountains Sunday and also in the higher mountains of Baker County. Tonight will be milder than the current night, and Sunday will be warmer, but not as warm as MAV guidance.
324 PM EST Sat Nov 25 2017 A cold front is about half way through the forecast area at 19Z with the front just past Jackson and Williamsburg, and continuing to move southeast. Even so it will be noticeably cooler on Sunday with highs in the mid 40s to lower 50s or about 10 to 15 degrees cooler than today.
1248 PM EST Sat Nov 25 2017 A cold front approaches from the Ohio Valley today, then crosses the area tonight.
Strong warm high pressure aloft will move overhead today then shift east Sunday.
421 PM EST Sat Nov 25 2017 Rain and snow showers are possible tonight with a trough of low pressure before high pressure returns dry weather on Sunday. In fact, given a lack of significant northerly component overnight, PoPs even in the ridges have been hauled in a bit and QPF cut. Operational models, including the higher resolution ones, really fail to yield much/any QPF in the terrain. Fries All precipitation should depart by sunrise Sunday as high pressure will move in from the southwest. More sunshine will not mean warmer temperatures, however, with most locations only rising into the upper 30s and lower 40s on Sunday.
1241 PM EST Sat Nov 25 2017 Shower chances return today with the passage of a cold front. Rain and snow showers are possible tonight with a trough of low pressure before high pressure returns dry weather on Sunday. One round of very light rain has already moved through the region this morning, a second round of showers is expected this afternoon as an upper trough approaches the Great Lakes and Ohio Valley region. The upper trough will cross the region this evening, with continued rain and eventual snow showers in cold advection.
144 PM CST Sat Nov 25 2017 A slow moving cold front currently stretches from Memphis to near Nashville. Ahead of this front temperatures have risen into the lower 60s in many locations, except south of the TN river, where more persistent cloud cover has been.
243 PM EST Sat Nov 25 2017 A cold front will cross the region late this afternoon and evening.
1123 AM CST Sat Nov 25 2017 A cold front at 2 AM had crossed south of the Plateau and will continue to move through the remainder of the forecast area by sunrise. No rainfall is expected to reach the ground due to the dry air in the lower levels of the atmosphere. Temperatures will be noticeably cooler today as highs struggle to reach seasonably cool normals compared against yesterdays record high readings.
1212 PM EST Sat Nov 25 2017 An approaching dry cold front will move through the forecast area this evening.
/Issued 1002 AM CST Sat Nov 25 2017/ Have raised high temperatures for Today a couple of degrees across the board even in the wake of the cold front that is now south and east of the area. A cold front has brought a wind shift to the north at all sites except the southern sites of KMLC and KFSM. /Issued 345 AM CST Sat Nov 25 2017/ Weak cold front settling into the region early this morning with a few light echoes showing up on radar near the Kansas/Oklahoma border. Cooler air will filter in behind the front, but high temperatures will still remain above normal with afternoon highs topping out in the 60s for much of the forecast area this afternoon. Overall, the weekend will be quite pleasant for November as high pressure dominates the central conus.
1238 PM EST Sat Nov 25 2017 A cold front crosses today with limited moisture. Cooler Sunday. Quite a bit cooler in valley locations farther east where the atmosphere decoupled this evening. A cold front will push through today. Have a half inch or less snow accumulation along the higher ridges of the northern mountains. Upper trough exits towards Atlantic Canada, leaving the area under control of high pressure and dry conditions through mid week. Expect 500hPa heights to rebound, along with 850hPa temperatures, resulting an a warmer than normal period for the entire CWA.
333 PM EST Sat Nov 25 2017 High pressure will keep dry conditions across the region into mid week. High pressure will build across the region through the period. Forecast temperatures are on the cooler side of guidance.
216 PM EST Sat Nov 25 2017 A dry cold front will cross our region late this evening into early Sunday morning.
223 PM MST Sat Nov 25 2017 Dry high pressure with westerly flow aloft will be over western and central Wyoming Tonight through Sunday evening with warming continuing.
1202 PM EST Sat Nov 25 2017 Shower chances return today with the passage of a cold front. Rain and snow showers are possible tonight with a trough of low pressure before high pressure returns dry weather on Sunday. One round of very light rain has already moved through the region this morning, a second round of showers is expected this afternoon as an upper trough approaches the Great Lakes and Ohio Valley region. The upper trough will cross the region this evening, with continued rain and eventual snow showers in cold advection.
145 PM MST Sat Nov 25 2017 High pressure will persist over the next 36 hours bringing mostly clear conditions to eastern Utah and western Colorado with the exception of some high cirrus. Satellite indicates mid to upper level moisture moving onshore clockwise through the high pressure flow, but deeper moisture will not arrive until the start of the work week. Southwesterly flow will increase Sunday night as a strong trough moving onshore the west coast moves inland.
1032 AM MST Sat Nov 25 2017 An upper ridge building to the west and a weak surface pressure gradient will lead to mostly sunny skies today with warmer than average temperatures, mainly in the 50s, and westerly winds at 5 to 15 mph. On Sunday the upper ridge will shift eastward across the region while a warm front lifts northeastward across the forecast area. Sunday high temperatures will be in the 60s across most of the area which is 20-25F degrees warmer than the average for this time of year.
Weak back-door cold front making its way swd as well, and will be reinforced/pushed swd by another disturbance later tonight. Upper ridge to be squeezed ewd in response to a strong w coast trof as we move into next work week.
243 PM EST Sat Nov 25 2017 A dry cold front will pass through late tonight.
242 PM CST Sat Nov 25 2017 A ridge is positioned over the western half of the United States while a trough is now over the eastern half. Cooler air today following the passage of the cold front from yesterday will be replaced with warmer air to cap off this holiday weekend.
1002 AM CST Sat Nov 25 2017 Have raised high temperatures for Today a couple of degrees across the board even in the wake of the cold front that is now south and east of the area. A cold front has brought a wind shift to the north at all sites except the southern sites of KMLC and KFSM. /Issued 345 AM CST Sat Nov 25 2017/ Weak cold front settling into the region early this morning with a few light echoes showing up on radar near the Kansas/Oklahoma border. Cooler air will filter in behind the front, but high temperatures will still remain above normal with afternoon highs topping out in the 60s for much of the forecast area this afternoon. Overall, the weekend will be quite pleasant for November as high pressure dominates the central conus.
250 PM EST Sat Nov 25 2017 Rain and snow showers are possible tonight with a trough of low pressure before high pressure returns dry weather on Sunday. Operational models do not show much precipitation necessarily occuring during the late afternoon hours, but once the cold front moves through, cold advection off Lake Erie should allow for at least some expansion in shower coverage. All precipitation should depart by sunrise Sunday as high pressure will move in from the southwest. More sunshine will not mean warmer temperatures, however, with most locations only rising into the upper 30s and lower 40s on Sunday.
245 PM CST Sat Nov 25 2017 High pressure building into the midsection of the country this afternoon, and northwesterly winds are dominating behind the cold front from last night. Light winds become a little variable in the overnight hours as the ridge moves through the region. By morning, on the north side of the ridge, oriented from the Southern Plains up into the Ohio River Valley, the winds come around to more SSW to start the day. Sunday night, the lows remain in the upper 30s.
Mid/high level clouds will accompany this warmer air.
1230 PM EST Sat Nov 25 2017 High pressure will build in behind a cold front, persisting into the middle of the work week, offering continued dry weather. Mid level trof axis to pivot east of the region with northwest flow developing. Expect temperatures to be near normal with lows from the upper 20s north to the lower 30s south. Temperatures look to be a little below normal with highs on Sunday ranging from the lower 40s north to the upper 40s south. Upper trough will be centered over New England to start the period, while a ridge dominates to the west, leaving the Ohio Valley under a northwest flow aloft.
130 PM EST Sat Nov 25 2017 A cold front exits this evening with limited moisture. Cooler Sunday. A weak cold front will cross the area through tonight. No precipitation is expected across the lowlands. Models show H850 temperatures reaching minus 4C over the higher elevations northeast mountains overnight, ranging to 1C across the extreme southern sections. Upper trough exits towards Atlantic Canada, leaving the area under control of high pressure and dry conditions through mid week. Expect 500hPa heights to rebound, along with 850hPa temperatures, resulting an a warmer than normal period for the entire CWA.
Once ridge axis moves in overnight, winds becoming southwest will end the lake effect and allow skies to partially clear. Core of coldest air stays north of Lk Superior but clipper low pressure system is expected to deepen as it moves just north of Lk Superior 12z-18z. Precip amounts look very light and there should be no big impact from any liquid precip since temps are well above freezing. Nam has a 500 mb ridge across the Rockies which moves into upper Great Lakes on Mon. A trough then moves into the northern Rockies 00z Tue and into the northern plains 12z Tue.
A mid/upper trough and associated cold front move through the region early Sunday morning. High pressure begins to build in behind the front producing clearing skies. and slightly cooler temps especially to coastal areas.
325 PM EST Sat Nov 25 2017 An area of high pressure will continue to bring dry air into South Florida tonight with cool temperatures. Models are in good agreement with bringing a reinforcing cold front through the region on Sunday. Once the front moves through, high pressure will build back into the area bringing another shot of drier and cooler air along with it. Towards the end of the week, the GFS and the ECMWF show another cold front moving towards South Florida. A quiet pattern is expected through much of the forecast period for the Atlantic and Gulf waters as high pressure remains in place over the area. A reinforcing cold front will move across the area on Sunday which will help to keep a northerly wind flow in place through the beginning of the week.