Aikyam-Lab/Synoptic-Bench huggingface dataset:
Water vapor loop indicated an upper level ridge over ALTA. cirrus clouds were spilling over the upper ridge. Band of clouds is forecast to shift slowly to the west today and tonight as high pressure moves south over MAN.
Upper high pressure will build in and strengthen over Colorado today. It will also result in slightly warmer temperatures than yesterday with afternoon highs about 5 to 10 degrees above average for this time of year. Upper ridge over the Great basin and Rockies will begin to flatten ahead of the next system, providing another mild and dry day to Colorado. Look for highs in the 40s to lower 50s for the high valleys, and 50s to near 60F for the plains.
401 AM CST Thu Jan 4 2018 Water vapor loop indicated an upper level ridge over ALTA. cirrus clouds were spilling over the upper ridge. Band of clouds is forecast to shift slowly to the west today and tonight as high pressure moves south over MAN.
High and mid level cloud should move out of the area late Friday morning with the passing of a short wave trough. /ISSUED 350 AM CST Thu Jan 4 2018/ Today will continue a gradual warming trend through the weekend, with temperatures already generally near or a little warmer than this time last night. A light freeze is likely across at least the northern half of the area tomorrow morning, with lows ranging from the upper 20s across the Piney Woods region to the low/mid 40s right along the coast.
Highs will be approaching the freezing mark with some upper 30s and 40s possible across southwestern portions of the area. Friday: An upper disturbance will dive into the base of the trough over the East coast which will cause a backdoor front to move into the area early on Friday.
A weak warm front will usher in precipitation in central Oregon in the form of freezing rain and sleet early this morning. The freezing rain and sleet will spread north this afternoon into north central Oregon as well as south central and soputheast Washington. The warm fron weakens thsi afternoon as it reaches the lower Columbia Basin and the Foothills of the Blue Mountains where freezing rain and sleet accumulations are expected to be very light. The next system brings another batch of light freezing rain and sleet to the lower Columbia Basin and adjecent valleys.
428 AM MST Thu Jan 4 2018 Water vapor shows upper ridge over the Northern Rockies with northwest flow through the Northern Plains. At the surface, trof is located over the western Dakotas. Upper ridge axis to our west will continue to nudge east and bring even warmer temps to the region for today, with plenty of 40s from northeastern WY through the Black Hills into southwestern SD. A short wave embedded in the northwest flow aloft will back a cold front through western SD tonight, with the western edge of the colder air mass banking up against the Black Hills. Have kept freezing fog in the forecast for late tonight through Friday along the eastern slopes of the Black Hills, but also added areas further south/east of the Black Hills late tonight into Friday morning per latest guidance.
Another, but stronger, low pressure system will approach from the southwest late tonight before moving across the region on Friday.
Latest water vapor imagery shows the axis of an upper level trough moving just east of the TN Valley this morning, with a strong upper ridge building into the Intermountain West. At the surface, a cold front extends from its parent low over the eastern Great Lakes, south-southwestward along the Appalachian Mountains and into central Mississippi/northern Louisiana. High pressure will continue to build through the day, with north- northwesterly winds around 10 mph. The exception will be across the higher elevations of northeast Alabama and southern middle Tennessee, where wind chills drop to or slightly below 0 for a few hours early Friday morning.
/issued 355 AM CST Thu Jan 4 2018/ (Today and Tonight) A highly amplified upper level pattern will remain over the Lower 48 the next 24 hours, with a deep upper level trough over the eastern states and a ridge over the Rockies. Clouds will decrease later tonight, with overnight lows ranging from the upper 20s north, to the lower 30s south.
Although we will see lee troughing beginning to strengthen today, abundant high level cloud cover will keep temperatures from rising above yesterdays numbers. Stronger lee troughing will manifest itself this weekend as a progressive short wave moves around the western CONUS ridge and drops into the region from the northwest.
Current temperatures range from the mid teens to the lower 20s. Today, Arctic high pressure will continue to build into the Mid-South. Mid to high clouds will move into the northeastern half of the CWA this evening as the high settles over the region.
/issued 343 AM CST Thu Jan 4 2018/ SHORT TERM (Today through Friday): Surface observations indicate that freezing temperatures are occurring across portions of the northern ranchlands early this morning. Mostly clear skies and very light winds should continue to allow temperatures to drop to or below freezing across much of the area through around sunrise. Abundant sunshine will allow temperatures to recover today with high temperatures reaching the low 60s at most locations, especially away from the coast. High temperatures Friday will be in the low to mid 60s.
Some patchy sprinkles and -RA are possible this evening and overnight, but confidence is low at the moment given the dry air in place at the low levels. High amplitude upper ridging over the Pacific coast will maintain mostly stable and cooler than normal weather over the Srn plains in the short-term.
Showers over central California will end by afternoon as a low pressure system moves out of the area, leaving decreasing clouds and mild temperatures behind.
A weak warm front will usher in precipitation in central Oregon in the form of freezing rain and sleet early this morning. The freezing rain and sleet will spread north this afternoon into north central Oregon as well as south central and southeast Washington. The warm front weakens this afternoon as it reaches the lower Columbia Basin and the Foothills of the Blue Mountains where freezing rain and sleet accumulations are expected to be very light. The next system on Friday, which will be stronger, brings another warm front with a batch of light freezing rain possibly mixed with occasional sleet to the forecast area from midnight to midday on Friday with a chance of freezing rain continuing Friday afternoon through Friday night across the lower Columbia Basin and adjacent valleys.
The northeast third of the state will likely remain at or below freezing today with the remainder of the state warming into the mid 30s to lower 40s.
The center of an Arctic high pressure is currently slipping down the Upper Midwest this morning. The far southwestern corner of Missouri into southeast Kansas may reach the freezing mark. There will be another weak push of cold high pressure for Friday into Friday night.
538 AM CST Thu Jan 4 2018 Ridge of high pressure stretched from northern Minnesota across western Iowa into the lower Missouri Valley at 08Z. These clouds relate to baroclinic zone found on the western edge of the ridge and will impact temperatures as they spread south into the area this morning. The cold air is expected to linger over the region through Friday night as the ridge axis remains nearly stationary just east of the area from central Minnesota into central Iowa. Warming trend arrives over the weekend as western ridge slides into the plains region.
High pressure over the Great Basin region will weaken during the next couple of days but mostly dry conditions along with above normal temperatures will continue through Friday.
500 AM CST Thu Jan 4 2018 Early this morning, much of the central US into central Canada was under the influence of Arctic high pressure. For today and tonight, cold high pressure will continue to dominate over the area.
535 AM CST Thu Jan 4 2018 Downslope flow will help boost and spread warmer temperatures across Kansas today with portions of Central/South Central seeing daytime highs rise into the 40s. This will lower temperatures across Northern/Central Kansas on Friday with warmer readings on the periphery of this shallow cold airmass over Southern Kansas.
This process will accelerate late tonight into early Friday as the aforementioned warm front lifts north through the area, and a deeper/stronger southerly fetch becomes establishes courtesy of an initial lee cyclone over the Central/Southern Plains. Some light shower activity is possible early tomorrow in association with the retreating warm front, with a thunderstorm or two over East Central LA by afternoon. The initial lee cyclone is forecast to weaken and lift out to the NE on FRI, only to be quickly replaced by another over the TX panhandle FRI night, further strengthening low level winds fields.
However, low clouds should linger through much of the day, especially north of the warm front which will bisect the CWA from E- W by 18Z.
Cold front stretching from Nw Ga to Se Al will weaken tonight as an upper ridge begins to build in from the south.
Low pressure over Lake Michigan is lifting north. Stratiform precipitation remained on the west side of the low throughout today. This instability /CAPES near 200 J/kg/ were enough to help a few thunderstorms develop out ahead of the low's cold front. The strong winds associated with the low will exit with it this evening. Showers may clip the Lake Michigan shorelines and the UP as the low lifts north this evening and overnight. high pressure builds in for Friday.
629 PM CDT Thu Apr 27 2017 SE winds 5 to 10 kts across all but eastern cwa this eve as low pressure developing southern plains. A warm front will shift north into central Oklahoma and Arkansas on Friday allowing for much warmer temperatures across the ArkLaTex with highs forecast to climb into the 80s. The warm front will will serve as the focus for convection on Friday night across mainly the interstate 30 corridor.
1152 PM CDT Thu Apr 27 2017 For tonight, an upper level trough will deepen to our west and our upper level flow will begin to strengthen out of the southwest.
At the surface, low pressure is strengthening over southeast CO/northeast NM with ridging through the Mississippi Valley. Fairly pleasant conditions are setting up for Fri across most of the area, with the warm front generally along the KS/Nebraska border, leaving the forecast area in the capped warm sector. The highest confidence in flooding still remains from eastern OK into northern AR and into southern MO. At this time it looks like the lowest 2,000ft should remain warm enough to limit accumulation. By 12z Mon, the upper low will be lifting over the mid Mississippi Valley with the wrap around precip exiting northeast KS. We look to remain in a cool progressive pattern with yet another piece of energy diving south across the central Rockies Tue night and into the high Plains Wed.
634 PM CDT Thu Apr 27 2017 The mid afternoon surface map shows strong 991 mb low pressure over ne Lake Superior with cold front extending through western Ohio into central KY/TN. Aloft a 538 dm 500 mb low was over ne MN into western Lake Superior with a strong upper level trof over the Midwest.
1013 PM EDT Thu Apr 27 2017 Along the Florida Keys, skies are mostly clear with temperatures holding in the lower 80s along with extremely high dewpoint readings in the upper 70s. Surface wise, A western Atlantic ridge axis extends across the Florida peninsula.
/issued 355 PM CDT Thu Apr 27 2017/ (Tonight and Friday) Expect gusty south to southwest winds to slowly decrease through the overnight hours with overnight low temperatures in the low to mid 60s. A weak cold front will move into the Big Country during the morning hours, with the the only effect being a wind shift to the north at 5 to 10 mph. Highs will generally be in the low to mid 90s, with a few locations approaching the upper 90s.
922 PM CDT Thu Apr 27 2017 Water vapor loop indicated an upper level trough from lower MI to western Ontario. Upper low over far northern Mn will continue to lift NE into Ontario overnight. A lobe of energy rotating around the low will swing through the NE tonight so will maintain some low pops as weak returns showing up on Canadian radar. A quiet day for Friday as high pressure builds into the region. Fairly decent weekend on tap with high pressure keeping conditions quiet.
Upper ridge building in Friday with partly to mostly sunny skies.
A warm front will shift north into central Oklahoma and Arkansas on Friday allowing for much warmer temperatures across the ArkLaTex with highs forecast to climb into the 80s. The warm front will will serve as the focus for convection on Friday night across mainly the interstate 30 corridor.
The associated warm front will move from Arkansas up through Missouri late tonight and tomorrow morning and stall near the Missouri/Iowa border by 18Z Friday. Severe weather potential for our area during the afternoon appears to be limited as the highest instability looks to be down over far southeast missouri and southern Illinois. if the warm front can shift further north allowing the higher CAPE into our area 0-6km shear of 50-70kts will be more than sufficient for severe thunderstorms to develop.
As high pressure build into the great basin in the evening winds in the evening the gradient shifts east to west winds will decrease in the valley and increase in the mountains becoming breezy to locally windy from the northeast to east direction. Ridging will build across the state into the weekend as weather systems are deflected to the north.
1047 PM EDT Thu Apr 27 2017 A weak disturbance is expected to affect the area tonight, followed by high pressure Friday into the weekend.
Observed sub-surface temperature remain well above freezing, with METro model road surface models suggest a short period of of slushy pre-dawn snow accumulation depending on snow intensity.
1040 PM CDT Thu Apr 27 2017 Updated aviation portion for 06Z TAF issuance and new information added to update section Still getting spotty drizzle, freezing drizzle and flurries across the area due to a couple weak surface trofs and cyclonic flow, so kept small pops until moisture shallows out later tonight.
1143 PM CDT Thu Apr 27 2017 A warm front will continue to push north across the forecast area tonight.
942 PM EDT Thu Apr 27 2017 A cold front crosses late today and this evening.
Trended toward cooler guidance for this region overnight.
803 PM EDT Thu Apr 27 2017 A cold front crosses late today and this evening.
A cold upper low will form over northeast Utah late tonight then move south to near the Four Corners by Friday evening.
1212 AM EDT Fri Apr 28 2017 A cold front will cross the region Friday afternoon.
/Issued 423 PM CDT Thu Apr 27 2017/ A cold front will push across the Panhandles tonight before stalling south of the forecast area. The frontal boundary is then forecast to lift northward Friday and Friday night as a warm front before a secondary surge of even much colder air drives the front south again.
/issued 629 PM CDT Thu Apr 27 2017/ SE winds 5 to 10 kts across all but eastern cwa this eve as low pressure developing southern plains. A warm front will shift north into central Oklahoma and Arkansas on Friday allowing for much warmer temperatures across the ArkLaTex with highs forecast to climb into the 80s. The warm front will will serve as the focus for convection on Friday night across mainly the interstate 30 corridor.
745 PM EDT Thu Apr 27 2017 High pressure will briefly build in tonight.
651 PM CDT Thu Apr 27 2017 The low pressure system responsible for the past two days of wintry precipitation is finally, slowly making its exit over eastern Lake Superior today into central Ontario tonight towards Hudson Bay on Friday. As the low matures and lifts north, the upper Midwest will be within the colder northwest flow resulting in occasional snow showers impacting parts of northeast Minnesota through Friday, though little additional snowfall accumulation is expected. Some sunshine Friday as the low exits with temperatures a bit warmer than today, breaking the freezing mark for most locations in the low to mid 40s outside of the Minnesota Arrowhead region. Behind the exiting system, a low amplitude ridge will build from the Northern Plains into the Upper Midwest.
Chattanooga Airport, TN 57 85 66 87 / 10 20 10 10 Knoxville McGhee Tyson Airport, TN 55 84 65 88 / 10 10 10 10 Oak Ridge, TN 55 87 66 88 / 10 10 10 10 Tri Cities Airport, TN 52 87 59 87 / 10 10 10 20.
Broad trough aloft will cover most of the country but heights will rise over southeast sections, particularly Florida. Low level ridge will continue to extend from the Atlantic across the peninsula and provide a south/southeast gradient wind.
1031 PM EDT Thu Apr 27 2017 A weakening area of low pressure over the Gulf of Maine will continue to drift northeast into tonight. A front accompanied by showers will move across the region Friday morning and will help to sweep out the cool and wet conditions with warmer temperatures Friday afternoon and into the weekend.
The cooler temps of lower 50s should be located within the precip areas near the Kansas border to the upper 50s in Southeast Oklahoma behind the lifting boundary.
Upper low over far northern Mn will continue to lift NE into Ontario overnight. A lobe of energy rotating around the low will swing through the NE tonight so will maintain some low pops as weak returns showing up on Canadian radar. A quiet day for Friday as high pressure builds into the region. Fairly decent weekend on tap with high pressure keeping conditions quiet.
Before then, there are still some showers that have developed across southern Wisconsin due to some weak low level instability associated with cold low level air that has wrapped in on the southern side of the low/mid level trough. Thanks to the persistent cloud cover and rain showers, temperatures have stayed fairly cool in the low 40s today, so we will not have to drop much to get into some potential frost/freeze temperatures.
1154 PM CDT Thu Apr 27 2017 /06Z TAFS/ Low level jet was very strong, with the KSJT VAD indicating 55 KTS in the lowest gate and 70 KTS in the 3rd. /issued 355 PM CDT Thu Apr 27 2017/ (Tonight and Friday) Expect gusty south to southwest winds to slowly decrease through the overnight hours with overnight low temperatures in the low to mid 60s. A weak cold front will move into the Big Country during the morning hours, with the the only effect being a wind shift to the north at 5 to 10 mph. Highs will generally be in the low to mid 90s, with a few locations approaching the upper 90s.
803 PM EDT Thu Apr 27 2017 Warm and humid high pressure will build in through the end of the work week.
Returning warm front will act to steepen profile for greater lapse rates needed for free parcel lift in warm sector by Friday night.
This seems appropriate given instability limitations imposed by sub 60 dewpoints and a plume of warmer mid level air advecting along the advancing front. Dry weather returns Friday with high pressure. Any cooler air behind today's front will be quickly ejected to the north as strong warm air advection takes over. Eastern ridge will try to build late Friday, but will be shunted by a series of upper level waves which will ride over the top of the rising heights.
840 PM EDT Thu Apr 27 2017 A cold front will over the Mountains this evening will drift into the central Piedmont overnight, then dissipate.
Broad mid level trough covered most of the western two-thirds of the CONUS this afternoon, with strong low noted over the Northern Plains into the Great Lakes.
523 PM MDT Thu Apr 27 2017 Current surface analysis shows low pressure centers over central WY and southeast CO, with frontal boundary stretching between the two areas. Temps are mostly in the 40s and lower 50s, with some 30s over the higher Black Hills and portions of northeast WY. Regional radars showing heavier bands of pcpn wrapping around developing upper low from south central MT to central WY to far western Neb. Upper low will continue to develop over eastern WY tonight, then track southeast into northeast CO before getting swallowed up later on Friday by stronger trough and low developing across the Great Basin and Four Corners area.
This is in response to an area of low pressure developing and deepening across the southern high plains.
731 PM EDT Thu Apr 27 2017 A cold front crosses late today and this evening.
Winds increase and become gusty by afternoon at all terminals as mid to high cigs develop with approaching warm front near the end of the taf period.
1032 PM EDT Thu Apr 27 2017 High pressure will briefly build in tonight.
Lows tonight will drop into the lower to middle 40s.
1015 PM EDT Thu Apr 27 2017 Warm and humid high pressure will build in through the end of the work week.
Southerly winds around 15 mph will remain through the rest of the afternoon across the area with temperatures continuing to warm up reaching the low 90s interior and mid/upper 80s along the coastal areas.
For the pre-dawn hours through at least midday tomorrow, look for more widespread precip chances as a trough axis rotates through.
Should be enough wind to keep lower elevation min temps from falling below freezing, though a few spots along I-25 could see some patchy frost by early Fri morning. should see a lull in precip in the morning, before upper level low begins to take shape across the 4 corners during the afternoon, bringing increasing showers to much of the area by late day as upward motion intensifies. Cold front and deepest cold air look to stay north of the Palmer until late afternoon, with steadier/heavier precip holding off until around 00z. Max temps will be cooler most locations as clouds increase and temps aloft begin to cool.
/issued 227 PM CDT Thu Apr 27 2017/ A broad upper trough is over most of the country with the base of the trough over southeast New Mexico and West Texas. Strong winds at the base of the trough are mixing downward to the surface across the area. A High Wind Warning is in effect for the Guadalupe Mountains and Wind Advisories are in effect for the southeast New Mexico plains, central and western portions of the Permian Basin, Van Horn and the Highway 54 Corridor, Davis Mountains, and the Upper Trans Pecos for today. The upper trough digs southward over the Intermountain West on Friday.
Main influence to the weather tonight is the persistent cutoff low over southern Alberta and southern Saskatchewan Canada with a weak low pressure trough running through central MT with nearly stationary light showers along the boundary. A low pressure system over British Columbia will join with the closed low and begin to push the closed low east across Saskatchewan Canada Friday.
During the afternoon, there is a secondary upper level low that develops in the four corners region.
Expect another round of gusty winds as a cold front moves south through the state on Friday.
A broad upper level trough remains situated over the Rocky Mountain region this afternoon which has kept plenty of clouds and showers hanging around the area. The cold front is almost entirely out of our forecast area with a cold air mass settling in its wake. On Friday, the amplification of a ridge of high pressure off the west coast will finally swing the base of the trough through our CWA. In response to the cold front, overnight lows tonight will be quite chilly with many locations dropping below freezing.
740 PM EDT Thu Apr 27 2017 A cold front will over the Mountains this evening will drift into the central Piedmont overnight, then dissipate.
Per satellite trends, clouds have gone nowhere today, courtesy of both low level chilly air (for some diurnal component) and pronounced low level cyclonic flow with low pressure departing into southeast Ontario. For tonight, a ridge of high pressure builds in from southwest to northeast for clearing skies allowing for good radiational cooling given light airflow. Depending on how much decoupling takes place, will likely see some freezing temperatures across the area. Otherwise, looks a bit warmer for highs with readings in the upper 40s/lower 50s.