Aikyam-Lab/Synoptic-Bench huggingface dataset:
AMA is on the eastern edge of the chance for seeing low clouds and patchy freezing fog during the early morning hours. Clearing in the afternoon expected to allow the northwest half of the forecast area to warm into the lower- to mid-50s, with eastern sections mainly remaining in the 40s.
Dry and cold air has begun to filter in the area but cloudy skies has limited complete cooling for today but as clouds begin to clear tonight, radiational cooling could set in and low temperatures will drop to the upper 20s for areas north of I-20 and the lower 30s south of I-20.
521 PM CST Thu Feb 13 2020 VFR conditions should persist through the fcst period as high pressure approaches the state from the north. Winds will initially stay Nrly overnight Thursday, before shifting to N/Erlies Friday morning as high pressure shifts Ewrd.
The upper trough and a more potent cold front will drop south out of the Great Lakes tonight, providing increased chances for snow showers. After FROPA, lake effect showers will continue within cold NW flow into the day Friday, favoring the I-80 corridor and the eastern ridge tops.
541 PM CST Thu Feb 13 2020 Cold high pressure will quickly shift east tonight and be replaced by a strong southerly pressure gradient at the surface. The wind will remain fairly strong Friday evening as a cool front/trough axis moves into the area.
A reinforcing surge of high pressure will lead to continued dry conditions through Friday. With high pressure, we can expect cooler temperatures through the period. Lows tonight will drop into the upper 30s to low 40s, and highs Friday only reaching into the low 60s. With this onshore flow, Friday night temperatures will be just slightly warmer than tonight, with lows in the 40s.
Clear skies and above average temperatures are being seen this afternoon as weak high pressure remains over the area today. This pattern does break down tonight as an approaching trough off the PacNW moves onshore north of the area.
836 PM EST Thu Feb 13 2020 The western Atlantic ridge, which has dictated our weather for the past several days, is beginning to show signs of breaking down as a high amplitude trough sweeps towards the eastern seaboard. The ridge axis is close to overhead, and the uniform southeasterly wind field has begun its collapse. The leading edge of a weak cold front which should bridge over the Keys tomorrow afternoon/evening is evident on satellite imagery as it pushes into the eastern Gulf. Tomorrow early evening, a weak cold front will bridge through the area, with winds switching to north, then quickly to northeast. A weak cold front will move through the Florida Keys coastal waters tomorrow evening.
350 PM CST Thu Feb 13 2020 Cold front will continue to push further into the Gulf tonight as high pressure moves into the Gulf South. Expect lows tonight to bottom out in the upper 30s and lower 40s north and in the low to mid 40s south. An hour or two of temperatures near or just below freezing will be possible across portions of southwest Mississippi.
It was just a little too dry for A cold front is pushing its way south across the area tonight and is currently located near the border of Levy and Citrus. Expect the low clouds to linger throughout the day. (00UTC TAF) Ahead of an approaching cold front, widespread IFR to LIFR cigs/vsbys are expected overnight due to low stratus and fog. Sea fog continues to be a concern over the coastal waters this evening through the early morning hours as moisture pools ahead of a cold front moving through the area.
As main trough axis moves off the eastern high plains, could still see a small area of flurries or light snow across northwest Oklahoma late tonight so will not make any changes to that part of the forecast.
554 PM CST Thu Feb 13 2020 No major issues are expected tonight as we remain under the influence of high pressure over the Plains. While most areas should stay at or above the freezing level, a brief dip slightly below freezing in the far northern zones cannot be ruled out.
However, as the low levels continue to cool, the top of the mixed layer will reach -10C and colder from north to south tonight. During the day Friday, advection of drier air into the area, some limited heating under an inversion, and high pressure building in will finally allow clouds to dissipate. Clear skies and surface ridging moving over on Friday night will allow for good radiating/cooling conditions.
The challenge for tonight will be how surface temperatures react to clear skies and a maintenance/strengthening of the surface pressure gradient as well as warm air advection in the low levels from west to east. A warm front will push across western and central North Dakota tonight as warm air advection strengthens via low level southerly flow. For Friday, increasing 700mb-500mb moisture across northwest and north central North Dakota will lead to increasing clouds ahead of a cold front. The cold front over the southern Canadian Prairies will push from northwest to southeast late Friday afternoon through Friday evening. Highs Friday will range from the upper 20s east central to the lower 40s west.
At the surface, Arctic high pressure is located over the eastern Dakotas with southerly boundary layer flow developing across much of the forecast area. Temperatures at 2pm range from the single digits across the South Dakota plains, to the lower 20s across northeastern Wyoming. Arctic high pressure will continue to shift southeast of the region as milder air slowly works back into the area. Warmer air will arrive in earnest late tonight into Friday, as south to southwest winds increase.
453 PM EST Thu Feb 13 2020 A cold front will exit the Downeast coast this evening.
Axis of the main upper level trough over the Plains will move eastward through the area this evening. Tomorrow, as heights rise across the region and the high shifts farther east, winds will turn southerly. This will allow for slightly warmer afternoon temperatures, though highs will still struggle to climb much above freezing where there is snow cover. This will allow warmer temperatures and drier conditions to return, courtesy of an air mass of largely Pacific origin.
With that [and pattern recognition] in mind, areas of freezing fog cannot be ruled out late tonight and early Friday morning (09-15Z).
The approaching cold front has crossed into northernmost FL as of 8 PM, with moist SW flow remaining in place across the local area. Better rain chances will materialize across the north with approach of the cold front Friday morning. Overnight lows remain well above normal in the low to mid 60s. The leading edge of a weakening cold front will approach our area late, bringing scattered showers (30 percent chance of rain) to areas north of I-4 before sunrise. Weak cold frontal boundary across the I-4 corridor early in the period will continue to sag into the southern peninsula by evening. Cooler temperatures with U60s to L70s along/north of I-4 with M-U70s southward and L80s not out of the question for Okeechobee County and the Treasure Coast.
/issued 229 PM CST Thu Feb 13 2020/ A weak cold front that moved through the area this morning will keep temperatures below normal into tomorrow. Light winds and clear skies could allow for some patchy freezing fog to develop tonight in southeastern New Mexico and the northwestern Permian Basin but it should get too dense or widespread to affect travelers.
400 PM CST Thu Feb 13 2020 In the near-term, Arctic high pressure remains in firm control of the local weather pattern this afternoon with latest MSAS analysis still showing the center of high pressure located over eastern North Dakota. High pressure will gradually shift east of the region on Friday which will finally allow southerly flow to return to the area.
/issued 244 PM CST Thu Feb 13 2020/ (Tonight and Friday) This afternoon, a cold front was located across south central Texas. Tonight, high pressure over the Central Plains will move eastward, allowing winds to turn out of the east and southeast.
640 PM EST Thu Feb 13 2020 A cold front will move across the area late this evening with cool and dry high pressure building into the area overnight into the weekend. Cold front currently moving through the Upstate will cross the forecast area over the next several hours with high pressure and drier air building in overnight. This will result in overnight lows ranging from the low 40s in the west to upper 40s in the east.
However, dry air has begun to nose its way into the region from the NW as a strong area of high pressure builds into the Ohio Valley. The Arctic high will slide through eastern MO into OH and WV Friday as an upper trough pushes southeast through the region. The high will slide further east Friday night allowing for weak warm advection to develop.
Low temperatures tonight forecast to range from the mid 20s across southeast Oklahoma to the lower 30s across deep east Texas with the entire region forecast to fall below freezing. /Tonight through Friday Night/ The long wave trough overhead will continue to shift east through mid-day on Friday while high pressure builds in at the surface. Temperatures tonight will get below freezing with much of the area in the mid to upper 20s. The high temperatures on Friday will struggle to 50 degrees for many parts of the region. Then, low temperatures for Friday night will once again get to or just below freezing.
638 PM EST Thu Feb 13 2020 A chilly westerly flow behind departing low pressure may bring a few snow showers tonight. High pressure and a cold, dry airmass will arrive on Friday.
249 AM EST Fri Feb 14 2020 Early morning satellite and radar imagery are showing a cold front slowly pushing south through the Florida Peninsula and adjacent Gulf waters. Cooler air will fill in behind the front today and tonight, especially over the northern half of the area.
No changes were needed for the midnight update as the snow shower band in association with a crossing trough and reinforcing cold front will progress across the ridges leaving much colder weather for Friday. After FROPA, lake enhanced snow showers will continue within cold NW flow into the day Friday, favoring the I-80 corridor and the eastern ridge tops.
1051 PM CST Thu Feb 13 2020 Cold high pressure will quickly shift east tonight and be replaced by a strong southerly pressure gradient at the surface. The wind will remain fairly strong Friday evening as a cool front/trough axis moves into the area.
It was just a little too dry for A cold front is pushing its way south across the area tonight and is currently located near the border of Levy and Citrus. Expect the low clouds to linger throughout the day. Sea fog continues to be a concern over the coastal waters this evening through the early morning hours as moisture pools ahead of a cold front moving through the area.
An upper trough will move east of the area by mid morning as Arctic high pressure builds in from the Missouri Valley.
1022 PM EST Thu Feb 13 2020 Cool and dry high pressure will build into the area overnight into the weekend. Cold front currently moving through the Midlands will cross the forecast area over the next several hours with high pressure and drier air building in overnight. This will result in overnight lows ranging from the low 40s in the west to upper 40s in the east.
321 AM EST Fri Feb 14 2020 A surface cold front is exiting to the east and behind it, much colder air has spread into the coal fields this morning. Most other locations will settle into the low to mid teens.
With Arctic high pressure shifting east of the area, light winds will become southerly this afternoon. 5-10 mph northwest winds on the east side of the ridge produced widespread teens below zero wind chills over the northern half of the area with a few locations touching -20F. The high pressure ridge will shift across the area this morning with light southerly return flow developing from the west this afternoon. Initial warm advection should push highs into the lower 20s over the southwest CWA, while upper teens will be more common over the northeast half of the area where warm advection will have less time to act this afternoon.
Persistent mid to upper trof located from the Great Lakes to the lower Plains will continue to shift east southeast to the eastern seaboard and western Atlantic through 12z Sat. Latest satellite loops continue to show a band of low clouds streaming from the north central Gulf to the Appalachians and mid Atlantic region early this morning, progged to shift east of the forecast area later this morning as the upper trof moves east. Near the surface a strong ridge of high pressure over the central and lower Plains states early this morning will shift east over the Ohio River valley to the Mid Atlantic region through 12z Sat. A moderate to occasionally strong northerly wind flow east of the ridge, mostly over the Northern Gulf states this morning, will gradually northeast late today and tonight then mostly east by early Sat.
An upper level trough moving east through the northern Rockies will push a dry cold front across northern Utah Friday.
The high pressure over the area this morning will shift east today and tonight as a trough of low pressure moves toward the area from the west. The winds and an overall warmer airmass will keep temperatures warmer with lows in the 20s to around 30, warmest west.
The center of a frigid dome of high pressure will slide across Illinois, Indiana, and Ohio, providing us with chilly north breezes and afternoon highs in the 20s. possibly close to freezing near the Tennessee border. Tonight the center of the high will progress to the East Coast but will ridge southwestward to the western Gulf Coast, resulting in a clear and cold night for southern Indiana and central Kentucky.
VFR conditions should persist through the fcst period as high pressure approaches the state from the north. Winds will initially stay Nrly overnight Thursday, before shifting to N/Erlies Friday morning as high pressure shifts Ewrd.
1249 AM EST Fri Feb 14 2020 Seasonably cool and dry high pressure will build into the area into the weekend. Positively-Tilted upper trough, currently stretching from the Great Lakes SW to the S Plains, will move SE and push through our region tonight. As the trough approaches, this band of upper moisture is expected to shift to our east during the day today. A reinforcing dry front will come through late today and tonight, bringing in additional drier and cooler air.
318 AM EST Fri Feb 14 2020 Cooler and drier weather will prevail as high pressure builds in today and into the weekend.
344 AM EST Fri Feb 14 2020 Seasonably cool and dry high pressure will build into the area into the weekend. Positively-Tilted upper trough, currently stretching from the Great Lakes SW to the S Plains, will move SE and push through our region tonight. As the trough approaches, this band of upper moisture is expected to shift to our east during the day today. A reinforcing dry front will come through late today and tonight, bringing in additional drier and cooler air.
350 AM EST Fri Feb 14 2020 High pressure and a colder airmass will be in place across the region today.
While most areas should stay at or above the freezing level, a brief dip slightly below freezing in the far northern zones cannot be ruled out.
No changes were needed for the late eve update as the snow shower band in association with a crossing trough and reinforcing cold front will progress across the ridges leaving much colder weather for Friday. After FROPA, lake enhanced snow showers will continue within cold NW flow into the day Friday, favoring the I-80 corridor and the eastern ridge tops.
With strong NW flow and very cold airmass filtering in from the NW the left over moisture in the lowest levels still squeezing out some precipitation. Ceilings continue to gradually rise at all sites, and this trend will continue through the night and Friday morning with skies mostly clear by mid morning as cold high pressure builds across the Appalachians. RG Chattanooga Airport, TN 46 26 54 36 56 / 0 0 0 10 10 Knoxville McGhee Tyson Airport, TN 42 23 52 35 54 / 0 0 0 10 10 Oak Ridge, TN 43 22 51 35 53 / 0 0 0 10 10 Tri Cities Airport, TN 39 16 48 30 52 / 0 0 0 10 10.
Light showers over southeast Oregon this evening will cross into southwest by midnight as an upper trough and accompanying cold front advance eastward. Latest guidance supports current forecast with light precipitation development focused across the higher terrain overnight. Areas south of a Burns-Mountain Home-Jerome line will remain dry with only a slight chance of a showers in the lower Snake Plain through early morning. Cold front tonight bringing rain/snow and brief MVFR/IFR, tracking NW to SE through Friday morning. Surface winds: easterly 5-15 kt becoming westerly behind cold front.
/NEW/ /Overnight through Friday Night/ Cold high pressure will remain in place across much of the central CONUS through Friday keeping the weather quiet across our region. Highs will top out in the lower 50s areawide. Overnight lows Friday night will be about 5-10 degrees warmer than tonight.
Should be abundant sunshine with center of high pressure to our south and southeast. Medium to High 850/925 waa will whisk away the influence of the low level thermal trough. Could see some increase in clouds a little later in the night ahead of an approaching trough.
/issued 223 PM CST Thu Feb 13 2020/ Low clouds have been holding on across the northwestern South Plains and southern Rolling Plains behind the cold front that has pushed across the region. Surface flow will remain out of the east to southeast across the area through tonight into tomorrow morning and model soundings show this, combined with weak isentropic lift, will likely help produce patchy freezing fog or low clouds across the Caprock for Friday morning. Will continue mention of this possibility through the overnight hours but it may need to be adjusted to start earlier and end later if some of the higher-resolution model soundings are correct. Areas that have been under the clouds today have struggled to climb above freezing, especially where snow remains across the northwestern South Plains.
A thermal trough and related inversion is keeping lingering low ceilings of around 2500 feet in place at the terminals.
808 PM MST Thu Feb 13 2020 Sharp positively-tilted upper ridge over the Rockies with some high clouds spilling over the forecast area this evening. On the surface, lee side trof lies over eastern MT-WY. Warm air advection aloft is beginning with 700mb temps 5 to 10 degrees warmer upstream of UNR.
Tonight, a weak cold front will move south into the region, The front will be the focus for light snow across the north.
Upper level ridging will quickly move into the area today which will allow southerly flow to return and temperatures to climb almost 30 degrees by the afternoon. This will become the start of a nice warming trend through the weekend with all cooler airmasses staying to our north with a tighter zonal flow aloft.
Dry and Warmer. Afternoon highs today will be warmer than yesterday and much closer to usual mid February highs.
Tonight, continued warm air advection fosters mild temps, with lows in the low to mid 20s.
Wind chills will remain hazardous through mid morning until the warmer air finally starts having an impact. Winds will shift around to the northwest behind the trough axis, although the true cold front will hold off until later in the day on Saturday.
Winds will become southerly as the high scoots east-southeasterly through the area, becoming breezy through the afternoon and evening as the pressure gradient tightens on the backside of the high. However, cloud cover will increase during the day Saturday ahead of an approaching mid level trough, which could bring a brief sprinkle of rain to northeastern Missouri and west-central Illinois.
South to southwest winds around 5 knots early this morning will shift to the northwest and north and increase to 8 to 10 knots between 13-15Z across the northern terminals, and after 18Z across the southwest terminals as a cold front moves slowly south through the region. /issued 249 AM EST Fri Feb 14 2020/ Early morning satellite and radar imagery are showing a cold front slowly pushing south through the Florida Peninsula and adjacent Gulf waters. Cooler air will fill in behind the front today and tonight, especially over the northern half of the area.
338 AM CST Fri Feb 14 2020 Low clouds and possibly some areas with patchy freezing fog extended from eastern New Mexico into the South Plains and Panhandle early this morning.
An upper level trough moving east through the northern Rockies will push a dry cold front across northern Utah today.
Winds initially will be N-NE with a transition to E-SE as high pressure shifts eastward. Today Through Saturday Night An intense area of high pressure continued to settle southward overnight, just north of the state. Through the day, surface ridging will remain centered northeast of the area with cold air holding firm along the MS River valley. After today, surface ridging will move eastward which will bring a return to srly winds and a slow increase in moisture.
938 AM EST Fri Feb 14 2020 Cool and dry high pressure will build across the East through Saturday.
Now that the last of the wrap around stratocu over lower Acadiana has dissipated, expect VFR conditions to prevail through the forecast period as dry air takes over the lower levels. Main issue again today will be the elevated nrly winds behind our cold frontal passage. A Canadian ridge stretches from the northern gulf coast across the plains and Mississippi Valley into Canada this morning. Today and Saturday dry and cool conditions are expected as the ridge is over the region. Saturday the ridge will shift to the Atlantic coast which will turn the flow back onshore.
Highs on Saturday will be closer to normal despite the weak cold front.
a warming trend is underway! Cooled temps for today slightly to account for both the cooler start and low stratus that may develop (See RAP and NAM) or slowly push in from the west.
Any snow showers and flurries will diminish with time today, as high pressure builds into the Commonwealth.
625 AM EST Fri Feb 14 2020 High pressure and a colder airmass will be in place across the region today.
The cold front continues to push through Lemhi county and southwest Montana this morning.
Low-level moisture remaining below this steepening cold air aloft has allowed overcast skies to continue along with some drizzle or light snow showers at times over the higher terrain of NE TN and SW VA aided by upsloping. with high pressure at the surface sliding across OH during the day today will bring a brief shot of arctic air. Expect highs in the low/mid 30's in SW VA and the plateau with upper 30's in much of NE TN and upper 30's to low 40's elsewhere despite skies becoming mostly sunny.
/issued 358 AM CST Fri Feb 14 2020/ A deep, positively-tilted trough continues to move east across the region early this morning. We are finally going to see a mostly sunny day across the Mid-South but temperatures will remain quite chilly with highs in the low/mid 30s north of I-40 and in the upper 30s to mid 40s south. Return flow will resume on Saturday as the surface anticyclone shifts to the east. However, the low- levels will remain rather dry tomorrow with nil rain chances.
A Canadian ridge stretches from the northern gulf coast across the plains and Mississippi Valley into Canada this morning. Today and Saturday dry and cool conditions are expected as the ridge is over the region. Saturday the ridge will shift to the Atlantic coast which will turn the flow back onshore.