Aikyam-Lab/Synoptic-Bench huggingface dataset:
236 AM MST Tue Jan 10 2017 Upper trough and associated fgen band of snow quickly shifting east this morning across the region. Active westerly flow will continue in the period as the NE Pac upper trough breaks down and ejects in pieces toward the region. Snow will shift east and end this morning as the upper trough exits the region with the ll frontal boundary stalling over the far southern fa.
/RETRENDED EVENING TEMPS/ As afternoon temps were over 5 degrees warmer than forecast in a few locations, issued a quick update mainly to retrend for warmer evening temperatures with minimal impact expected for the overnight lows. A quiet weather pattern is in store through the short term portion of the forecast period with westerly flow in the mid and upper levels and southerly flow in the low-levels.
A second upper level trough over the Northwest Territories will move south through Alberta and strengthen into a large closed low over all of central Canada. Montana will receive several rounds of moisture and upper level disturbances that will be ejected from the main upper lows. Meanwhile, at the surface, a Canadian cold front will push southward into the forecast area Tuesday afternoon and evening.
Temperatures are expected to remain well above freezing tonight, so there are no concerns for freezing drizzle. The closed off structure of this upper low has caused problems in model data being able to handle the timing and pressure structure evolution as it shifts east into the Desert Southwest.
As the high retreats, the pressure gradient increases and winds become south 10-20kts. High pressure will weaken and slide east on Tuesday. Tuesday will likely be much like Louisiana and Arkansas today with the building of clouds ahead of an approaching cold front. The southern edge of the upper-level trough is expected to merely brush northern Alabama, and the associated cold front may get close enough for shower activity concentrated north of I-20 by tomorrow afternoon/tonight.
Have freezing drizzle mention retreating to the east in the next few hours as winds shift to a northwest direction. Reports with this band have been as expected with around a half inch on the low end and pushing 1. 5 to 2 inches on the high end. In addition, have just recently started receiving some freezing drizzle/mist reports along Highway 2 on the North Dakota side and the Grand Forks/Fargo metros (and areas in between). Roads around the area don't sound like they are being impacted much but will monitor for any concerns besides some slight visibility restrictions and freezing on windshields. A cold front is expected to usher in another shot of arctic air late Tuesday night and Wednesday. Cold high pressure will then settle into the area for Wednesday.
249 AM MST Tue Jan 10 2017 The cold front pushed through the northern half of the forecast area early this morning with good clearing behind the front. The cold front does appear to be weakening though WV imagery showing the ridging over the great basin already causing the frontal surface to begin waving back to the north.
144 AM EST Tue Jan 10 2017 Strong ridge of high pressure will extend over the forecast area. with a weak trough over coastal waters today. Warmer conditions expected with high temps today in 65-70 range in most areas.
Aloft, the longwave trough that has been over the eastern US is progressing eastward with ridging moving into its place. Tonight/Tuesday: As the center of the high shifts eastward, winds will continue to slowly veer to a more easterly direction. This will bring downstream ridging aloft over Florida.
338 AM EST Tue Jan 10 2017 A coastal trough will brush the region today into tonight.
Moisture dwindles behind the passing cold front this evening, and brings a break to the precipitation for Wednesday. Precipitation type is the primary concern this morning, with a messy morning commute expected for most areas as road temperatures remain at or just below freezing. We are getting reports of rain, snow, and freezing rain from observers and from observation stations across the east at this time, so will not make any winter weather advisory headline changes. Winds across the southern portions of the CWA are already gusting to near 30 knots as of 6Z, which is in line with some of the higher-end model guidance.
347 AM EST Tue Jan 10 2017 Arctic High pressure will begin retreating eastward off the coast today. Although still cold, lows tonight will range from the middle 30s north, to the lower 40s south. Warm advection continues on southerly winds, so warmer nights and temperatures above normal Wednesday afternoon, with readings in the low to mid 60s north and central, and possibly around 70 in the south Midlands/CSRA.
1246 AM EST Tue Jan 10 2017 Arctic High pressure will keep cold and dry air over the region through early Tuesday then begin retreating eastward. Surface and upper ridge off the Carolina coast with trough moving from the Midwest toward the Great Lakes region. Models do indicate a weak coastal trough Tuesday with moderately strong but shallow isentropic lift across the east Midlands during Tuesday afternoon and early evening. Deeper moisture remaining across the Tennessee and Ohio Valley regions near developing warm front. Warm advection continues so warmer nights and temperatures above normal by Wednesday afternoon.
306 AM CST Tue Jan 10 2017 A low pressure system has been developing over the central Plains early this morning, as high pressure remains anchored along the east coast. This low will move northeast toward the Great Lakes today. A cold front will slide east toward the area today as the aforementioned low tracks northeast.
342 AM CST Tue Jan 10 2017 Latest 08z surface analysis shows low pressure developing over southern Nebraska and northern Kansas with warm front extending into southern Iowa and northern Missouri. will be trending toward a warmer solution. This would result in a wintry mix of freezing rain/sleet/snow across the southern forecast area this morning. especially in the higher terrain and open areas.
Expansive upper trough continues to spin over the Desert Southwest region this afternoon while much of the area remains under westerly flow aloft. Stronger mixing of warmer air towards the sfc tomorrow led to raising highs a few more degrees to near 70 in addition to the slower progression of thicker cloud cover expected to arrive by late afternoon. In regards to the southwest upper trough weakening as it shifts across the southern plains, rain chances were reduced or removed during the afternoon.
Updated forecast earlier to increase coverage in the lower Columbia Basin.
615 PM CDT WED MAY 18 2016 224 PM CDT No real concerns expected this forecast period, as high pressure will dominate the region. Did lower min temps slightly in a few spots tonight, but with most places falling to the lower 40s. Although locations near the lake will be cooler, weak gradient and weak flow could allow for these areas to reach around 60 before cooler air off the lake pushes inland by midday. Rodriguez 224 PM CDT High pressure will continue to bring dry and warmer conditions to the CWA.
751 PM EDT WED MAY 18 2016 High pressure centered over the Great Lakes will extend into the Ohio Valley through Thursday night, providing dry conditions.
Water vapor had upper low over four corners region with westerly flow aloft over the CWA ahead of upper trough diving into western Canada / northwest US. Tonight through Thursday night, upper trough moves into CA / OR as it closes off and turns upper flow distinctly southwest over the CWA. Warm air advection will continue ahead of it with moisture return in response to lee trough and southerly flow. Upper low settles over the Pacific NW and stalls out late in the week, with ridging over the plains.
Hard to discount the power of the sea breeze this time of year given the relatively "cooler" Atlantic shelf waters.
Expect scattered showers and isolated thunderstorms along and ahead of a cold front.
814 PM EDT WED MAY 18 2016 Showers will decrease across the state this evening as high pressure builds in from the west.
Cold front moved across the area this afternoon bringing temperatures down around 10 degrees with winds shifting to northwesterly.
A drying trend will continue on Thursday with a few showers lingering over the mountain areas with the highest precipitation chances in the White Mountains region.
This evening, as the seabreeze spread north into Alabama, added convergence from outflow and a weak area of low pressure allowed for some stronger storms to develop.
/issued 321 PM CDT WED MAY 18 2016/ SHORT TERM (Tonight through Thursday Night):A late season cold front is located over the northern Ranchlands with a bow echo anchored along the boundary moving steadily east over Jim Hogg and Northern Starr counties. GFS as well as the HRRR shows a strong vort max moving across South Central Texas approaching the Lower TX coast through this evening. 8 to 2+ inches, and the disturbances will keep a small threat of severe weather with a more substantial transition to a heavy rain event with training of heavy showers and thunderstorms anticipated along and south of the cold front.
An upper level low pressure system over the West Coast will approach Central and Southwest Montana Thursday. The associated cold front will cross the Rockies 12-15Z and move east during the day.
GAH Upper trough over the British Columbia coast is digging and will continue to do so during this period.
Weak upper low spinning near the Arizona/New Mexico border at midday.
Anticipate the increasing low level moisture to keep lows in the lower to mid 40s for far eastern Iowa and northwest Illinois. 18z surface data has high pressure from the Great Lakes into the Plains. Quiet and dry conditions will be seen across the area from late this afternoon through Thursday as high pressure slowly moves toward the east coast. High pressure over the Great Lakes and Upper Mississippi River Valley will continue the light winds and dry conditions.
1149 PM EDT WED MAY 18 2016 VFR conditions will continue with high pressure positioned over the area. Aside from diurnal cumulus Thursday afternoon in the 7-8kft range, expect clear skies this forecast as high pressure expands over the area.
900 PM PDT WED MAY 18 2016 Weak high pressure aloft may allow partial sunshine again along the Southern California coast on Thursday, but clearing will be in short supply over the weekend as a large storm system develops across the West and strong onshore flow rebuilds the marine layer onto the coastal slopes. The surface pressure gradients were only 3-4 MBS KSAN to NV, but 6- 7 MBS onshore KSAN to the lower deserts.
1127 PM CDT WED MAY 18 2016 Upper level low situated over the southwestern states with an upper level ridge over the Northern Plains.
The low pressure system over Arizona will move slowly northeast and out of the area tonight. The low that helped fire this interesting and atypical May weather is shearing into New Mexico and Colorado tonight with a drier westerly/northwesterly flow to develop over the next 24 hours.
Another quiet evening across the Northern Plains with a steady return flow south wind on the backside of the departing high pressure. Max temps will be another couple degrees higher tomorrow with the warmer start due to the aforementioned steady south winds overnight.
18z surface data has high pressure from the Great Lakes into the Plains. Quiet and dry conditions will be seen across the area from late this afternoon through Thursday as high pressure slowly moves toward the east coast. High pressure over the Great Lakes and Upper Mississippi River Valley will continue the light winds and dry conditions.
More widespread convection is expected on Thursday as an upper level trough approaches from the west.
A trough of low pressure has eroded the western flank of the subtropical ridge.
High pressure will bring light winds and low waves through the weekend. HIGH High pressure will bring mostly clear skies overnight, with another round of late morning and afternoon cumulus likely Thursday, mainly away from Lake Michigan.
High pressure will shift east Thursday ahead of the next Pacific storm, which will stall over the Pacific Northwest through the end of the week. Isolated to widely scattered showers and a few thunderstorms continue over mainly the higher terrain and downwind valleys this evening. A upper level low over the Four Corners region will continue to pull away from the area this evening. The next upper level low will dig into the Pacific Northwest Thursday afternoon. The associated cold front is expected to reach northwest Utah Thursday afternoon.
945 PM EDT WED MAY 18 2016 After a fair and seasonable night, an upper level low will move across NY and PA Thursday with scattered showers or sprinkles, mainly in the afternoon.
711 PM CDT WED MAY 18 2016 Upper level low situated over the southwestern states with an upper level ridge over the Northern Plains.
741 PM EDT WED MAY 18 2016 High pressure builds in on Thursday with a drier environment.
718 PM EDT WED MAY 18 2016 Aviation After one more chilly night, with frost and even some freezing temperatures, we will see warmer days and nights ahead.
High pressure and the associated dry airmass will continue to dominate the local weather overnight, providing quiet conditions. The clouds are in an area where dewpoints are in the 40s to lower 50s while drier dewpoints in the low to mid 30s west of highway 51. A weak upper level trof extending from 560 dm 500 mb low over southeast Ontario into the southern Great Lakes and into northern IL was helping produce these cumulus clouds. High pressure ridge will remain over the area the remainder of the week and into the weekend.
Locally heavy rainfall over southeast Georgia and coastal Late evening surface analysis depicts weak low pressure (1009 millibars) off the Carolina coast, with a stationary frontal boundary extending southwestward from this low across far southern Georgia and along the northern Gulf Coast. troughing remains in place over the Great Lakes states with ridging suppressed to the northwestern Caribbean Sea and the southwestern Atlantic, creating deep west-southwest flow over the southeastern U.
This all in part to the stationary boundary north of the region and a midlevel trough moving in from the west. Cold front has stalled across the area. This stalled front along with upper level disturbance and an expected coastal trough with abundant moisture (PWAT around 2 inches) will result in another chance for heavy rains. though don't expect to get much warmer than that. Highs area wide likely to be in the lower to mid 80s.
1128 PM CDT WED MAY 18 2016 Closed upper low over four corners as seen in WV imagery. Closed low over the Great Lakes with trough back into central plains. Ridging across the Dakotas and Pacific Northwest with an intense short wave between over Lake Winnipeg as seen in visible. Quasi Block with H5 ridge from central plains into Hudson Bay and closed low over the four corners.
If temperatures prevail closer to the warmer NBM, forecasted amounts will be too high.
627 PM CST Tue Feb 22 2022 Mainly sunny throughout western NE with very cold temperatures from the low single digits north central to 10 to 13 above southwest. The large, positively tilted upper trough across the western U. Wednesday into Wednesday night, the base of the upper trough will advance from srn CA and NV to across the Four Corners. A very strong 120-140KT jet max from New Mexico northeast to across the Lower Great Lakes will provide weak upper level divergence. As the upper trough moves over CO, Snowfall could reach a half inch to inch near and south of I80 late Wednesday night invof an H7 trough axis.
Temps tonight will fall into the teens and 20s below as the arctic airmass of 1040 plus mb high pressure settles into the northern plains centered over central ND by tomorrow morning.
634 PM EST Tue Feb 22 2022 High pressure will build over the region tonight and provide generally dry conditions through Wednesday night.
Due to a warm nose (>0 deg C) aloft with a large refreezing layer near the surface, sleet will be the predominant precipitation type near I-44 with a transition to freezing rain to southeast (due to a shallower subfreezing layer near the surface). Note there could still be some freezing rain mixed within areas of sleet. Precipitation should exit most of the area by late afternoon; however, lingering light freezing rain may persist across far southeast Oklahoma.
554 PM CST Tue Feb 22 2022 Mainly sunny throughout western NE with very cold temperatures from the low single digits north central to 10 to 13 above southwest. The large, positively tilted upper trough across the western U. Wednesday into Wednesday night, the base of the upper trough will advance from srn CA and NV to across the Four Corners. A very strong 120-140KT jet max from New Mexico northeast to across the Lower Great Lakes will provide weak upper level divergence. As the upper trough moves over CO, Snowfall could reach a half inch to inch near and south of I80 late Wednesday night invof an H7 trough axis.
Will also bump winds up a bit over the higher elevations. SHRA/TSRA ahead of approaching cold front will continue to affect KTYS and KCHA through 10z-12z, with some VCSH lingering through 14z. Cold front and precip clear to the east of all terminals by 14z, but despite northerly sfc winds, winds aloft remain WSW through the day. CD Chattanooga Airport, TN 66 50 72 52 62 / 60 40 30 60 60 Knoxville McGhee Tyson Airport, TN 62 47 67 52 62 / 60 60 60 50 70 Oak Ridge, TN 61 45 64 50 61 / 50 60 60 60 60 Tri Cities Airport, TN 61 45 61 50 61 / 60 60 80 40 80 TN.
Dry conditions prevail for the majority of the forecast area as high pressure extends eastward from the upper Midwest.
The slightly warmer conditions will continue through the overnight hours with the lows mostly around 10 below, however the Musselshell River valley could see temperatures approaching 20 below again. Reimer Upper level ridging upstream with northwest flow aloft supporting leeside troughing pressure gradients though not clear cut on their strength at this point. It keeps the weekend dry with warmer temperatures but still below normal with a fair amount of uncertainty based on snow cover impacts.
The Arctic air mass continues to settle into the Central Plains with the 1045mb high pressure system in eastern Montana.
It will be freezing rain and sleet, with the greatest chance for impacts at this time in the Warning area.
1254 AM EST Wed Feb 23 2022 Scattered showers will end with passage of a cold front early this morning.
1059 PM CST Tue Feb 22 2022 Have still been seeing visibility on webcams and airport observations drop below a mile at times along the Highway 14 corridor, and across much of southwest Minnesota, as winds are still gusting to around 35 mph early this evening.
Not a lot changing in this forecast cycle, with a pipeline of anomalously strong arctic air extending through the plains sourced from central Canada, and that will keep temperatures well below freezing for the rest of the week. For starters, tonight will be the first of 4 very cold nights, with what will likely be pushing the limits of the high end of the Wind Chill Advisory range pretty much area wide. By Wednesday evening, a substantial increase in cloud cover is expected across the area as a rapidly approaching upper trough develops across he Great Basin region and drops into the southern Rockies.
Wind speeds continue to fall as high pressure is moving toward the area. Temps tonight will fall into the teens and 20s below as the arctic airmass of 1040 plus mb high pressure settles into the northern plains centered over central ND by tomorrow morning.
Areas of fog early this morning will give way to mostly sunny skies and unseasonably warm temperatures, with afternoon highs in the lower-mid 80s inland, close to record highs, with upper 70s along the coast.
232 AM EST Wed Feb 23 2022 Early this morning a cold front is beginning to cross eastern KY from NW to SE. While rainfall totals over the past 24 hours under-performed across the northern half of the area, the southern half of the area did receive 1-2 inches of rain, with the highest amounts occurring over the Cumberland basin. We'll get a brief break from the rain today as the front pushes SE away from the area and high pressure builds in from the plains. Skies will be partly to mostly cloudy, with afternoon high temps ranging from the low to mid 40s across the I-64 corridor, to lower 50s across the SE.
1142 PM CST Tue Feb 22 2022 Mainly sunny throughout western NE with very cold temperatures from the low single digits north central to 10 to 13 above southwest. The large, positively tilted upper trough across the western U. Wednesday into Wednesday night, the base of the upper trough will advance from srn CA and NV to across the Four Corners. A very strong 120-140KT jet max from New Mexico northeast to across the Lower Great Lakes will provide weak upper level divergence. As the upper trough moves over CO, Snowfall could reach a half inch to inch near and south of I80 late Wednesday night invof an H7 trough axis.
Although dry air above this moist layer would usually suggest freezing drizzle, this air mass is cold enough to produce mostly sleet. As the high level clouds clear out this evening, low level moisture will come back with a vengeance on the caprock.
316 AM EST Wed Feb 23 2022 Much colder early today with patchy freezing drizzle ending as arctic flurries and light lake snow showers spread in from the west.
The cold front has very slowly been sagging south this evening and is just now entering Stewart County. Winds will shift to the northwest/north by 12z as a cold front moves through the terminals.
There has also been a signal for an initial burst of heavier sleet or freezing rain among various CAM solutions, aided by convective elements in unstable regime above the cold air. Models remain in fairly good agreement with spreading scattered areas of light to moderate sleet, with occasional freezing rain, into eastern Oklahoma during the morning hours, moving into northwest Arkansas by late morning. Further south, the wintry precipitation will likely trend more toward freezing rain with ice accumulations likely across southeast Oklahoma and northwest Arkansas.
on the eastern periphery of a pronounced (albeit somewhat complex) upper level trough over the western CONUS.
Surface obs show the cold front near the central portions of SE Texas, close to IAH. /ISSUED 951 PM CST Tue Feb 22 2022/ Cold front through Conroe and Columbus at 930 tonight and appears to be a bit cooler and more progressive.
104 AM EST Wed Feb 23 2022 Following a cold front, high pressure will build over the region later tonight and provide generally dry conditions through Wednesday night.
Low pressure moved south of the area today, bringing freezing rain, thunderstorms, sleet, rain, freezing drizzle and snow to the area. Freezing drizzle has just about ended across the area and anywhere from a glaze of ice to 0. Through late afternoon the freezing drizzle will end from west to east.
951 PM CST Tue Feb 22 2022 Cold front through Conroe and Columbus at 930 tonight and appears to be a bit cooler and more progressive. Surface obs show the cold front has moved through the northern portions of SE Texas, with northerly winds currently at CLL and soon at UTS. In this set, GLS/LBX has the lowest vis for fog and began to mention it at SGR/HOU/IAH.
330 AM EST Wed Feb 23 2022 This morning the cold front responsible for our wet weather across NW GA overnight was positioned to the west of the CWA slowly moving southeastward.
The severe storm threat has ended although the chances for rain and a few thunderstorms will continue across much of our CWA as a cold front drifts into the area. The cold front is progged to continue drifting south through the remainder of tonight and stall across our southeast Wednesday morning. Colder air will filter into our CWA in the wake of the cold front making the morning minimum temperature forecast difficult. The current forecast lows look reasonable ranging from the lower 40s northwest to the mid 60s southeast. /22/ Prior discussion below: Cold front still off to the NW, slowing considerably in parallel flow aloft.