Aikyam-Lab/Synoptic-Bench huggingface dataset:
An upper level low pressure system is centered over southwestern Arizona this morning and is spreading snow showers across a good portion of north-central Arizona. The low will continue tracking across southern Arizona through the day today, which will shift the focus of of widespread snow from central Arizona this morning into eastern Arizona this afternoon. Winter Weather Advisories remain in effect through the afternoon, and travelers should expect hazardous travel across a large portion of the high country today. A very potent cold front associated with this low has moved through the western half of the state early this morning, and will continue to progress east through the day. Mountain areas above 6000 feet will stay below freezing today, which will limit snow melt.
346 AM MST Mon Jan 23 2023 Water vapor imagery showing the main closed low still digging southward across west central Arizona. Ahead of the low across Colorado, there exists an extensive area of clouds around the 5000ft agl level over the plains and a swath of higher clouds above that towards the east. Radar beginning to show some increase in echoes over the higher foothills with a few flurries occurring per web cams. However, low level moisture remains in place across the plains at least through this evening then a bit better clearing towards sunup Tuesday with the approaching northern branch trof axis.
Water vapor imagery this morning showed closed upper low near Prescott with regional radar showing scattered rain/snow showers on eastern side of the upper low. The most recent model runs have backed off on QPF across the area which will result in less snow in the mountains and at the lower valley locations. With the low moving east tonight the reinforced cold air mass will bring another night of widespread freezing temperature to the area Tuesday morning.
(Today through Tuesday) A weak cold front has pushed through Central Alabama early this morning with west winds at 5-10 mph. Wrap around moisture behind the exiting low pressure system will keep low clouds in the area through the morning hours. Clear skies and calm winds tonight will allow temperatures to fall below freezing in most areas.
Temperatures will be stunted by the clouds and cold advection today, staying in the 40s for most areas (and even the upper 30s atop the highest Cumberland plateau areas in Franklin County TN).
519 AM EST Mon Jan 23 2023 Light snow and patchy freezing drizzle will end early this morning although slippery secondary roads and icy surfaces will persist for some time.
A ridge of high pressure will build just off the coast through the first half of the week.
U/L northerly flow is expected to keep our temps on the cooler side of normal, for awhile, with not much in the way of accumulating snow the next few days.
529 AM CST Mon Jan 23 2023 Today and Tonight: Cooler than normal and dry through the period. Early morning satellite imagery/RAP analysis showed the circulation around an upper level trough to our northeast with its axis now east of Mississippi. This upper level trough will continue shifting east and be replaced by mid level ridging today. Ridging surface and aloft will help clear out some of the remaining stratus over our CWA and allow for a decent amount of insolation. Both ridging surface and aloft will continue shifting east through tonight. This will hold morning lows in the upper 30s southwest while coldest morning lows just below freezing are expected in our northeast.
347 AM CST Mon Jan 23 2023 Today and Tonight: Cooler than normal and dry through the period. Early morning satellite imagery/RAP analysis showed the circulation around an upper level trough to our northeast with its axis now east of Mississippi. This upper level trough will continue shifting east and be replaced by mid level ridging today. Ridging surface and aloft will help clear out some of the remaining stratus over our CWA and allow for a decent amount of insolation. Both ridging surface and aloft will continue shifting east through tonight. This will hold morning lows in the upper 30s southwest while coldest morning lows just below freezing are expected in our northeast.
245 AM MST Mon Jan 23 2023 Upper low was located over the Southwest CONUS, wedged between upper ridges off the Pacific Coast and Great Plains.
Upper level trough will continue to lift to the northeast over Eastern US. The associated cold front; currently located along the I-4 corridor, will continue to move southward over the Florida Peninsula today along with cloudiness, showers, and a few thunderstorms possible this morning across Central and Southwest Florida. Breezy northerly wind flow will be present today in the wake of the cold front. This afternoon and tonight, the post frontal high pressure will build and dominate over the region with notably lower temperatures developing as some cooler and drier air will settle areawide. Rain-free conditions should prevail while the high pressure dominates.
431 AM MST Mon Jan 23 2023 Water vapor shows northern stream trof shifting into the Northern Plains with southern stream closed low over AZ. At the surface, cold front is quickly moving into central SD. For today, lingering light snow in our southern zones will quickly exit the area this morning, with gusty northwest winds behind the cold front gradually relaxing by this afternoon. For tonight into Tuesday, next northern stream trof quickly moves through and brings another band of light snow late tonight followed by gusty northwest winds into Tuesday. High Tuesday should be a tad warmer with some highs in the lower 40s east of the Black Hills. For the rest of the week into the weekend, long wave trof sets up and persists across much of the CONUS.
ARCTIC COLD AIR AND SNOW WILL MOVE WEST OF THE CONTINENTAL An amplifying high pressure ridge offshore of coastal western US will influence the large scale weather pattern over the Northern Rockies during this week.
510 AM CST Mon Jan 23 2023 Key Messages: - Frequent, Light Precipitation Chances Through New Week Into Weekend - Turning Colder Into the Weekend Precipitation Chances Tonight: GOES East water vapor satellite imagery shows a pronounced trough- ridge-trough wave pattern from the Ohio River Valley across the forecast area into southern Saskatchewan. The ridge has been progressively sagging to the southeast across the forecast area overnight, resulting in light and variable winds up to 850mb according to Vad Wind Profiles. The accompanying mid level vorticity lobes will advect the forecast area through midweek with an Arctic cold front sagging south, steepening low level lapse rates.
Northerly winds will remain gusty over the next couple of days, particularly along the near coast and coastal ridges. Benign weather conditions as a strong high pressure over the NE Pacific continue building toward NW California. Boundary layer cooling and stabilization aided in weakening winds across the lower elevations overnight, but conditions has been gustier across area ridges. Winds over the ridges will continue to be gusty over 30 mph along some of the more exposed coastal locations as well as some ridgetops bordering Lake and northeast Mendocino counties, but these remains sub-advisory levels.
542 AM EST Mon Jan 23 2023 High pressure ridge will build in from the west today with low level flow predominantly northwest, bringing a cold advection pattern. Cooler temps expected today behind the recent cold front, with highs today in the 60s, close to or just shy of normal.
Meanwhile, a deep trough will approach from the west.
Some guidance suggests rapid development of dense fog pushing northeast along the highest elevation of the Plateau by daybreak Tuesday. The passage of the surface front early in the afternoon should scour any stratus, and actually lead to another surge in afternoon temperatures towards the freezing mark.
For tonight, a growing concern for freezing fog is present over the snowpack. Have added freezing fog over the snowpack for tonight into the morning. The highs clouds and fog might help in this arena with a mix of teens and 20s.
226 PM EST Mon Jan 23 2023 There is a low chance for freezing drizzle late tonight, mainly toward northwest Indiana and southwest Michigan.
/EC/ Today and Tonight: Cooler than normal and dry through the period. Early morning satellite imagery/RAP analysis showed the circulation around an upper level trough to our northeast with its axis now east of Mississippi. This upper level trough will continue shifting east and be replaced by mid level ridging today. Ridging surface and aloft will help clear out some of the remaining stratus over our CWA and allow for a decent amount of insolation. Both ridging surface and aloft will continue shifting east through tonight. This will hold morning lows in the upper 30s southwest while coldest morning lows just below freezing are expected in our northeast.
Gusty north winds will remain in place today in the wake of a passing cold front. Blustery north winds on backside of upper low over south central Arizona continue across the region. But they will start to gradually diminish through the afternoon/evening hour as that upper low moves toward El Paso tonight.
1045 AM MST Mon Jan 23 2023 Water vapor shows northern stream trof shifting into the Northern Plains with southern stream closed low over AZ. At the surface, cold front is quickly moving into central SD. For today, lingering light snow in our southern zones will quickly exit the area this morning, with gusty northwest winds behind the cold front gradually relaxing by this afternoon. For tonight into Tuesday, next northern stream trof quickly moves through and brings another band of light snow late tonight followed by gusty northwest winds into Tuesday. High Tuesday should be a tad warmer with some highs in the lower 40s east of the Black Hills. For the rest of the week into the weekend, long wave trof sets up and persists across much of the CONUS.
An upper level low pressure system is centered over southwestern Arizona this morning and is spreading snow showers across a good portion of north-central Arizona. The low will continue tracking across southern Arizona through the day today, which will shift the focus of widespread snow from central Arizona this morning into eastern Arizona this afternoon. Winter Weather Advisories remain in effect through the afternoon, and travelers should expect hazardous travel across a large portion of the high country today. A very potent cold front associated with this low has moved through the western half of the state early this morning, and will continue to progress east through the day. Mountain areas above 6000 feet will stay below freezing today, which will limit snow melt.
Beautiful conditions are then on tap through Tuesday afternoon as southerly surface winds and more sun allow for temperatures to warm into the low-50s.
A weak upper trough from the north will pass through our Idaho zones later today with clouds, and perhaps flurries in the central Idaho mountains. The higher clouds will exit southeast this evening and hi-res models again show extensive low clouds tonight across the central Snake Basin with patches westward into the Treasure Valley.
929 AM CST Mon Jan 23 2023 The overnight cold front has about exited the forecast area, with winds diminishing quickly behind it. A secondary cold front is analyzed east-west across the southern Canadian Prairies, with a small area of radar echos that has emerged in the north central. With this update we did add in slight chance PoPs in the Turtle Mountains area to account for these, with some light snow possible among the lower ceilings.
119 PM EST Mon Jan 23 2023 Aviation - Light snow tonight - An upper level system and cold front moving across the northern Great Lakes region tonight will bring a brief period of lake enhanced synoptic light snow this evening/overnight.
1145 AM CST Mon Jan 23 2023 Key Messages: - Frequent, Light Precipitation Chances Through New Week Into Weekend - Turning Colder Into the Weekend Precipitation Chances Tonight: GOES East water vapor satellite imagery shows a pronounced trough- ridge-trough wave pattern from the Ohio River Valley across the forecast area into southern Saskatchewan. The ridge has been progressively sagging to the southeast across the forecast area overnight, resulting in light and variable winds up to 850mb according to Vad Wind Profiles. The accompanying mid level vorticity lobes will advect the forecast area through midweek with an Arctic cold front sagging south, steepening low level lapse rates.
(This evening through Tuesday) Light snow showers in SW Virginia, extreme NE Tennessee and the higher elevations of the East Tennessee Mountains will come to an end late this afternoon. In the upper levels, ridging will be over the Southeast. At the surface, high pressure centered over the Southeast will drift into the Mid-Atlantic tomorrow afternoon as low pressure ejects from the TX/LA Gulf Coast.
Lows tonight will be in the low 30s to mid 20s; a few degrees south of normal for mid January. Highs will climb into the mid 50s and low 60s for much of the area as a cold front approaches from the west.
1055 AM CST Mon Jan 23 2023 (Today through Tuesday) A weak cold front has pushed through Central Alabama early this morning with west winds at 5-10 mph. Wrap around moisture behind the exiting low pressure system will keep low clouds in the area through the morning hours. Clear skies and calm winds tonight will allow temperatures to fall below freezing in most areas.
A cold front continues to push through SW Florida this morning. (18Z TAFS) Some MVFR/IFR conditions possible over the next few hours as low clouds linger in the wake of a cold front that continues to push through SW FL. A cold front will move through southern Florida today taking with it most of the showers and storms that moved through the eastern gulf waters overnight. High pressure builds in over the southeast U.
However, the secondary cold front that was north of the Canadian border has dropped to the border now. This secondary cold front will continue to push ever so slowly southward, reaching somewhere along or north of the highway 2 corridor this evening, where it should stop. The higher end amounts (1-2 inches) look to occur along and north of the highway 2 corridor, with the under 1 inch amounts to the south.
Winds have finally begun to shift to the southwest ahead of the cold front, currently draped across South Florida. The 12z KKEY RAOB highlighted a noticeable increase in moisture ahead of the front, with multiple cloud layers sampled in the low-levels. In its wake, another area of high pressure will build across the Southeast tonight through Tuesday night, resulting in freshening breezes.
A rope cloud along the leading edge of a cold front has been moving through the Gulf waters, while a cumulus cloud line has developed along the Lower Keys thanks to the southwest winds.
A ridge of high pressure will build offshore through early this week.
A trough axis has tracked east across MN into western WI this afternoon. This milder air will spread east following the trough axis late this afternoon. Some very light snow or flurries accompanied the trough, but cyclonic flow persisting across central MN and northern WI this evening could generate a couple more light snow showers or flurries, along with considerable cloudiness.
(Rest of today through Tuesday) A weakening cold front remains draped over South FL this afternoon, and its influence has been felt across South FL since the early morning hours. Winds will continue their gradual shift from southerly/southwesterly to become more northerly as the front pushes through, and turning more northeasterly tomorrow as an area of high pressure builds in from southeast CONUS. With high pressure building over the area, expect tomorrow to be much drier, with temperatures a few degrees cooler than the past few days: lows in the mid 50s near the Lake, up to the mid 60s along the East Coast, and high temperatures in the mid-to-upper 70s.
155 PM CST Mon Jan 23 2023 Key Messages: - Frequent, light snow chances through the week - Turning colder for the weekend * NEXT SNOW CHANCES: late Tue night-Wed Upper level trough still on track to lift northeast out the desert SW tonight, working across the OH River valley on Wed.
Water vapor imagery showing the main closed low still digging southward across west central Arizona. Ahead of the low across Colorado, there exists an extensive area of clouds around the 5000ft agl level over the plains and a swath of higher clouds above that towards the east. Radar beginning to show some increase in echoes over the higher foothills with a few flurries occurring per web cams. However, low level moisture remains in place across the plains at least through this evening then a bit better clearing towards sunup Tuesday with the approaching northern branch trof axis.
1037 AM MST Mon Jan 23 2023 Upper low was located over the Southwest CONUS, wedged between upper ridges off the Pacific Coast and Great Plains.
225 PM EST Mon Jan 23 2023 High pressure will build over the region tonight through Tuesday.
The associated cold front extends through the western Atlantic, across southern Florida and into the southern Gulf of Mexico.
Temperatures will cool this afternoon behind a passing cold front, so did make a few minor adjustments to hourly T. We'll start off this morning with mainly zonal flow at 500mb, with a low north of Hudson Bay extending a trough through Manitoba and into ND and far eastern MT. A series of embedded troughs will move through the area this morning and Tuesday. At the surface we already have the initial trough across northeastern SN through southwestern SD, on it's way out. A wintry mix of snow or light freezing drizzle may be possible across the the mid slopes to western half of the Prairie Coteau.
Primarily zonal flow will develop in the wake of the last system with the surface cold front pushing well offshore. Surface winds will remain northerly today keeping drier and cooler air across the area.
The overnight cold front has about exited the forecast area, with winds diminishing quickly behind it. A secondary cold front is analyzed east-west across the southern Canadian Prairies, with a small area of radar echos that has emerged in the north central. With this update we did add in slight chance PoPs in the Turtle Mountains area to account for these, with some light snow possible among the lower ceilings.
Unsettled weather will persist through at least midday today as an upper low opens up while diving SE across the Upper Ohio Valley, maintaining cyclonically curved mid-level flow across Kentucky and southern Indiana. All precip types seem to be on the table this morning, from light snow grains (read: very low snow-liquid ratio) to sprinkles/drizzle, and even some pockets of freezing drizzle where it gets cold enough.
259 PM EST Mon Jan 23 2023 Snow showers continue into this afternoon, with some accumulation across the higher terrain. Dry Tuesday per high pressure. Upslope snow continues across West Virginia and southwestern Virginia as an upper air disturbance rotates through and cold air advection continues in the lower levels. This leads to low confidence in the cloud cover, and hence the low temperatures tonight. A high pressure system will build in on Tuesday providing dry weather.
(Through Tonight) High pressure will build from the northwest to the north through the night. Temperatures will range from the lower 30s inland, to the lower to mid 40s along the coast. Frost will be fairly widespread inland, with interior portions of SE GA falling to freezing.
Below freezing overnight lows still look on track. Lows tonight will be in the low 30s to mid 20s; a few degrees south of normal for mid January. Highs will climb into the mid 50s and low 60s for much of the area as a cold front approaches from the west.
Overnight lows will dip down into the low teens over most of the plains, with the higher terrain sitting at low single digits, or even lower in the valleys. Starting late morning, snow will once again kick up over portions of the Continental Divide, and by afternoon could spread to portions of the Upper Arkansas River Valley as well as the southern I-25 corridor and our far southeast plains, closer to the upper low. As of now, snow amounts and impacts appear to be minor, with accumulations through tomorrow evening of 1-3 inches over the higher peaks of the Sangres and Wet Mountains and half an inch or less for any lower elevations.
East of the mountains, there are some breaks in the low clouds along the Front Range. The low levels of the atmosphere will remain moist tonight. Where the low clouds clear out, there is a good chance for fog to develop, possibly as soon as this evening. The closed upper level low currently to our south will accelerate rapidly eastward late Tuesday, with northwesterly prevailing flow aloft filling in in its wake.
Little accumulations expected, though the higher hills could see a quick inch produce from these showers. Localized area of high pressure over SW MT has helped to produce a pressure gradient over south-central MT that's allowing Bit Timber through Harlowton to gusts to 50 mph this afternoon, but should diminish this evening as the previously mentioned wave crosses over the area. Localized downsloping over south-central MT on Tuesday will bring temperatures climbing back into the low to mid 40s, with clear skies. Winds will continue to be breezy along the foothills west of Billings, though not to any concerning magnitudes (more what's just normal for those locations in drying/warmer periods during the winter).
Dry and cool conditions prevail across the region through the week, with lingering north breezes primarily in the lower Colorado River Valley. North winds will continue to back-off through the night as the upper low over southern Arizona moves east toward El Paso. Models in good agreement keeping a highly amplified ridge off the west coast. This will keep the door open for systems to drop out of western Canada, maintaining a longwave trough for the Rockies east. These systems will be dry but act to reinforce northerly winds, primarily within the lower CRV.
Dry and much cooler conditions expected into tonight behind cold front now south of the area. Low level northerly flow above the surface will quickly veer to the east-northeast overnight as high pressure over the Southeast U. Elsewhere, min temps in the low to mid 50s are expected. Cold front has shifted south of the area, with high pressure over the southeast U.
103 PM PST Mon Jan 23 2023 Northeasterly winds will remain strong today across the ridgelines of the Sierra with dangerously cold wind chills. Freezing fog may develop in favored Sierra valleys each night starting tonight. Strong east winds will continue for the Sierra ridges through the day with continued impacts to aviation, backcountry recreation and ski operations. While the ridge wind gusts won't be as strong as last night into this morning, it may produce continued impacts through early Tuesday morning. * The rest of the week will remain quite cold as high pressure makes its return across the west.
Again, some light snow is possible, this time in pretty much every mountain zone, but much is on the low end scale, up to 3 inches possible during the Tue/Tue night time period on some mountain ridges. A third, and the strongest, rides down the ridge and leaves more snow on Wed through Thu, but again it will be a struggle on ridges even to get 3 inches. It does depress afternoon highs and at these temperatures can produce freezing fog that deposits on road surfaces and sidewalks, making for slick going. At this time, do not expect visibility to lower below one mile, which would initiate a Freezing Fog Advisory, but it may be close.
However, a weak sfc front and upper trough will be waiting in the wings of the western Dakotas for Tuesday. With the melting that has occurred today in the above freezing temperatures, there could be fog that develops before the clouds move in after midnight.