Aikyam-Lab/Synoptic-Bench huggingface dataset:
and Sunday An upper level low was situated over northwest WI early this morning, and was slowly shifting southeast. The upper low will shift east through the forecast area today and early tonight. The upper low, combined with low-level cyclonic northwest flow and 850-700 mb lapse rates of 7-8 C/KM, will result in numerous snow showers or mixed rain/snow showers across the entire forecast area by afternoon. Snow showers will continue into the early evening, then gradually weaken and shift east as the upper low departs and daytime instability wanes.
On that day, a weak cold front will ease towards the BRO CWFA from the north.
(Today through Sunday) A broken line of showers and thunderstorms, associated with a cold front, will continue to push south and east across the CWA today. High pressure will build in behind the front tonight and Sunday.
The area should be dry during the day with another round of light rain and light snow in beginning this evening as weak disturbances roll down the ridge and over the Central High Plains. Little to no accumulation is expected given the well above freezing soil temperatures. Overnight Sunday, precipitation chances increase over the southern half of the area as a lee trough moves in along the Front Range. Sunday morning, majority of the area along and north of I-70 could see temperatures approach their record lows in the low to mid 20s.
610 AM CDT Sat Apr 22 2023 (Today) Drier, post-frontal air continues to push into the TN Valley early this morning as the cold front that brought showers and storms to the area progresses eastward. Dew points have dropped into the low 50s as of 3 AM and will continue to lower into the low to mid 30s by the afternoon today.
However, snow showers should continue across the high country through most of the day. Highs today will remain in the 20s to 30s across most of the high country, with upper 30s to mid 40s likely across the plains. Cool temperatures will continue overnight with 10s across the high country and 20s to low 30s for most of the lower elevations. On Sunday, expect improving conditions as weak high pressure builds over Colorado with continued northwest flow aloft.
230 AM PDT Sat Apr 22 2023 Today will bring dry weather as weak high pressure moves over the region. Today through Sunday Night: Dry weather is expected today as a short wave ridge moves over the region. The ridge will help moderate temperatures, but still topping out a few degrees below normal with highs in the 50s to lower 60s.
509 AM MDT Sat Apr 22 2023 Water vapor imagery shows the upper low has now moved into Wisconsin while upper ridging is strengthening over the Pacific NW. At the surface, high pressure is pushing into the MT/ND area, staying north of the CWA.
742 AM EDT Sat Apr 22 2023 (Today and Tonight) Pre-frontal trough pushing through the region at the moment with mainly just mid-high clouds over NE FL/SE GA, while shower and isolated storms have developed over the Atlantic Coastal waters and these features will slowly pull off towards the NE by sunrise with some partial clearing and patchy fog development possible over inland areas. Isolated shower/storm activity will remain possible as the trailing cold frontal boundary pushes through NE FL during the evening hours, pushing south of the region after midnight, with clearing skies and increasing North winds after midnight, becoming breezy along the Atlantic Coast.
901 AM EDT Sat Apr 22 2023 A strong cold front will cross the region today with showers and thunderstorms.
423 AM CDT Sat Apr 22 2023 Today and Tonight: Cooler and drier air in the wake of the cold front will be in place for Saturday.
401 AM PDT Sat Apr 22 2023 Today will bring dry weather as weak high pressure moves over the region. Today through Sunday Night: Dry weather is expected today as a short wave ridge moves over the region. The ridge will help moderate temperatures, but still topping out a few degrees below normal with highs in the 50s to lower 60s.
Anderson (Issued 404 AM CDT Sat Apr 22 2023) Today and Tonight: The upper low will continue to rotate over the Upper Great Lakes today. A lobe of vorticity associated with the main upper low will swing through WI and bring widespread clouds and scattered to numerous snow showers this afternoon. Despite temps in the lower 40s this afternoon, the precip type should be predominantly snow. Look for snow showers to taper off from west to east this evening as the core of the upper low exits.
Verification-wise, it turned out that our entire CWA did indeed drop below freezing, with most places bottoming out 27-30. Water vapor shows us in northwest flow aloft with the main upper low spinning over the upper Midwest and Great Lakes region. This low will continue to work its way slowly east over that region in the coming days. Tonight will be another cold night with lighter winds and mainly clear skies with continued high pressure. A Freeze Warning is in effect for sub-freezing temperatures and even quite a few areas of hard freeze temperatures (28 degrees or below) tonight. Sunday will be another dry day though slightly warmer with highs right around either side of 60. Winds will be fairly light and turn southerly as the ridge axis moves through.
320 AM MDT Sat Apr 22 2023 Water vapor imagery shows the upper low has now moved into Wisconsin while upper ridging is strengthening over the Pacific NW. At the surface, high pressure is pushing into the MT/ND area, staying north of the CWA.
Upper level low will continue its slow push eastward today. Near to above freezing temperatures this afternoon should then limit any drifting snow threat. The amount of clearing skies will greatly impact the low temperatures tonight. ECMWF EFI is still highlighting the northwest and eastern portions for the more abnormally cooler temperatures. Many of the record lows for April 23rd are in the low to mid teens. Overall look for a dry and cooler than normal start to the week, followed by chances for mainly rain showers mid to late week with continued below normal temperatures.
924 AM CDT Sat Apr 22 2023 A broad trough has settled over the eastern CONUS early this morning. The primary trough axis traversed the Mid-South yesterday and is currently affecting the Upper OH River Valley. A cold front has allowed for overnight temperatures to drop into the 40s across the Mid-South. Expect temperatures today to be cooler with highs in the mid 60s to low 70s.
545 AM CDT Sat Apr 22 2023 Today and Tonight: Cooler and drier air in the wake of the cold front will be in place for Saturday.
Slightly lower temperatures are forecast today in the wake of a weak cold front that is moving through the area early this morning. Saturday through Sunday Night A weak surface cold front is moving through the forecast area early this morning, switching the wind direction to the north. Confidence is highest in the high terrain of northern Lincoln County where the ingredients for rain development are most apparent and higher terrain will enhance lift.
(Rest of Today) A cooler and drier airmass continues to advect into the Tennessee Valley this morning behind a cold front that brought widespread showers and thunderstorms last night.
610 AM CDT Sat Apr 22 2023 (Today through Sunday) Upper trough over the Upper and Middle Mississippi River Valleys this morning, with upper ridging off both the Atlantic and Pacific Coastlines. At the surface, a prefrontal trough has cleared our coastal waters, and by the time the forecast is issued, the true cold front will have cleared all but lower Plaquemines Parish. High pressure will build in from the north, drying us out and bringing a mostly sunny day with comfortable temperatures and low humidities. This will likely leave high temperatures on Sunday a few degrees cooler than today.
404 AM CDT Sat Apr 22 2023 (Issued 404 AM CDT Sat Apr 22 2023) Today and Tonight: The upper low will continue to rotate over the Upper Great Lakes today. A lobe of vorticity associated with the main upper low will swing through WI and bring widespread clouds and scattered to numerous snow showers this afternoon. Despite temps in the lower 40s this afternoon, the precip type should be predominantly snow. Look for snow showers to taper off from west to east this evening as the core of the upper low exits.
709 AM EDT Sat Apr 22 2023 A strong cold front will cross the region today with showers and thunderstorms.
A few showers developed along a Cuban land breeze in the offshore Straits of Florida and moved north towards the Lower Keys and Gulf Waters this morning. Temperatures are already in the lower 80s and dewpoints have increased to near 70 degrees, making for a muggy start to the day. A weak cold front will approach the Florida Keys coastal waters tonight and filter through into Sunday, with winds briefly becoming northerly after its passage. High pressure then moves into the eastern United States Sunday night leading to winds quickly clock around to east and southeast.
Low temperatures tonight will range from the lower 50s to mid 60s with winds shifting to northeasterly.
303 PM EDT Sat Apr 22 2023 This afternoon, an upper trough was across the area. The upper trough axis will swing through the area. With a lower freezing level, graupel will mix in at times. Models are showing clearing of the low level clouds, with just some high clouds at times as additional upper energy moves across. Believe the highest concentration of clouds will remain north, closer to the departing upper trough. Lows will be in the lower to middle 30s. This will lead to lows near freezing and will likely need a headline but it is not clear yet if that will be a frost advisory or freeze warning.
239 PM MDT Sat Apr 22 2023 Plenty of clouds and scattered mountain showers lingered across the region as instability and lift from a low amplitude mid-level short wave trough approaches from the northwest. A transitory ridge moves over the region on Sunday bringing mostly to partly sunny skies which, when combined with warm air advection in the lower levels of the atmosphere will help temperatures recover to near normal levels. A low-amplitude trough forces the ridge eastward Sunday night bringing increased clouds and a chance for showers after midnight. Temperatures tonight should be a bit cooler than last night as clouds decrease during the night.
1207 PM PDT Sat Apr 22 2023 Warmer than average temperatures continue through the weekend, with afternoon highs around six to nine degrees above normal today and Sunday.
349 PM EDT Sat Apr 22 2023 High pressure will slowly lift away to the northeast through tonight.
Rain has exited the area behind the cold front, and clouds will continue a decreasing trend through the afternoon. Showers and a few thunderstorms will continue through the early morning hours along a cold front. Cooler temperatures expected behind the front. Discussion: Currently a line of showers with a few embedded thunderstorms is moving through the southern Appalachian region along an advancing cold front. Expect temperatures to be 10-15 degrees cooler than what we experienced yesterday on the backside of the cold front.
919 AM PDT Sat Apr 22 2023 Cooler west of the mountains today with continued warm conditions in the low deserts.
201 PM EDT Sat Apr 22 2023 A weak cold front will move through the area tonight brining cooler temperatures.
This upper level low will move through the area in the short term. Freezing temperatures expected again tonight. Discussion: The upper level trof will move east through the area and will be more east of area tomorrow. Tonight, temperatures are expected again to drop near or below freezing area wide. Even though winds are up, below freezing temps will be able to damage sensitive vegetation.
338 PM EDT Sat Apr 22 2023 A cold front will move through the area through this evening. High pressure will build into the region Sunday.
1039 AM MDT Sat Apr 22 2023 Water vapor imagery shows the upper low has now moved into Wisconsin while upper ridging is strengthening over the Pacific NW. At the surface, high pressure is pushing into the MT/ND area, staying north of the CWA.
Sunday has upper ridging return to the area, bringing temperatures back to near-normal value (upper 50s) and bringing about dry conditions.
229 PM MDT Sat Apr 22 2023 Latest upper air analysis shows a closed low over the Great Lakes area. Circulating around the closed low was drier, cooler air. Tonight another weak upper level short wave trough will move over the southwest corner of the forecast area. WAA will return with the south winds, causing temperatures to be warmer than today. Sunday night an upper level short wave ridge will move in from the west. The continued WAA will keep lows a few degrees warmer than tonight.
/EC/ Today and Tonight: Cooler and drier air in the wake of the cold front will be in place for Saturday.
(Tonight) After a mostly sunny day, some high clouds are forecast to arrive late tonight as reinforcing dry cold front moves through. Expect overnight lows to drop down into the lower 40s with a few spots in the higher terrain dipping into the upper 30s.
Temperature readings thus far this afternoon have only risen into the mid 30s north to the lower 40s south. Lows on Sunday night are currently forecast to be just above freezing, so decided to forgo any Freeze Watch for Sunday night at this time.
Several models want to bring in clouds overnight, which would likely lead to some warmer temperatures than previously forecasted and may inhibit frost development.
(This afternoon through Sunday Night) Cloud coverage has begun to increase slightly this afternoon ahead of a cold front moving through the area. Much cooler temps will follow the front, knocking temps into the 30s to 40s overnight. If you are curious about the daytime tomorrow, it looks pretty similar to today but cooler.
Expecting an approaching cold front to bring scattered showers and isolated thunderstorms this afternoon along and ahead of the front as light SW winds steer showers and storms towards the coast.
A few locations could fall below freezing by Sunday morning, especially if skies become mostly clear late tonight.
254 PM EDT Sat Apr 22 2023 A weak cold front will move through the area tonight brining cooler temperatures.
1259 PM MDT Sat Apr 22 2023 Latest upper air analysis shows a closed low over the Great Lakes area. Circulating around the closed low was drier, cooler air. Tonight another weak upper level short wave trough will move over the southwest corner of the forecast area. WAA will return with the south winds, causing temperatures to be warmer than today. Sunday night an upper level short wave ridge will move in from the west. The continued WAA will keep lows a few degrees warmer than tonight.
130 PM EDT Sat Apr 22 2023 A strong cold front will cross the region today with showers and thunderstorms.
A surface cold front will move south across the area late this afternoon and evening. Temperatures will be cooler behind the front today, with highs in the 60s to low 70s across the Big Country, and the upper 70s and lower 80s from the Concho Valley/Heartland south prior to frontal passage. Temperatures will be much cooler tonight, with overnight lows mainly in the 40s. (18Z TAFS) Storms expected to develop near KSJT terminal by mid afternoon and spread south along a southward moving cold front into the other central and southern terminals before sunset. Cold front will follow, with deteriorating conditions through Sunday.
331 PM CDT Sat Apr 22 2023 Scattered convective showers have popped up across the area as the main upper level trough axis moves overhead. (This afternoon through Sunday Night) Cloud coverage has begun to increase slightly this afternoon ahead of a cold front moving through the area. Much cooler temps will follow the front, knocking temps into the 30s to 40s overnight. If you are curious about the daytime tomorrow, it looks pretty similar to today but cooler.
Warm and dry conditions are prevailing, with some locally breezy northerly winds as the upper level ridge flattens and moves eastward today. Otherwise, for the rest of today, a shower or isolated thunderstorm will be possible up in the higher elevations of the Sierra Nevada.
148 PM PDT Sat Apr 22 2023 Today will bring dry weather as weak high pressure moves over the region. Today through Sunday Night: Dry weather is expected today as a short wave ridge moves over the region. The ridge will help moderate temperatures, but still topping out a few degrees below normal with highs in the 50s to lower 60s.
251 PM MDT Sat Apr 22 2023 The northwest flow loosens up a bit today into Sunday, as weak ridging builds across the northern Rockies, pushing the broad Great Lakes trough to the east. Ridge isn't particularly sharp, and doesn't dislodge the cooler air in place, so temperatures will struggle to reach back to the western Wyoming April normals of the 50s.
For the rest of the afternoon through tonight, cooler, drier air will move south over the forecast area, bringing a drop in temperatures. Through Sunday, isentropic upglide will set up over the Lower Mississippi River Valley over the cool airmass that has moved over the region. Am not expecting the showers to affect the forecast area, though the thicker cloud cover near to the showers will decrease daytime heating over northwestern portions of the forecast area Sunday, and when combined with the secondary influx of cooler air, a large temperature range to the forecast area.
However, protected valleys/drainage areas could drop thus applied a cooler bias to these areas mainly along the northshore to coastal MS. KLG (Today through Sunday) Upper trough over the Upper and Middle Mississippi River Valleys this morning, with upper ridging off both the Atlantic and Pacific Coastlines. At the surface, a prefrontal trough has cleared our coastal waters, and by the time the forecast is issued, the true cold front will have cleared all but lower Plaquemines Parish. High pressure will build in from the north, drying us out and bringing a mostly sunny day with comfortable temperatures and low humidities. This will likely leave high temperatures on Sunday a few degrees cooler than today.
Another trough will move into the area Sunday afternoon. The combination of the trough, cool air aloft and daytime heating should kick off some more rain and snow showers, with the greatest concentration of precipitation in the afternoon. Chances for mainly light precip from time to time early in the week and not a whole lot of sunshine will be the highlights (or low lights?).
249 PM CDT Sat Apr 22 2023 The primary concern in the short term remains freezing/near freezing temperatures tonight and Sunday night. A modified Arctic airmass is streaming into the Plains and Midwest today, driven south by a long wave trough extending from the Hudson Bay Region all the way to the Southeast U. High pressure will settle into the Mid Mississippi Valley Sunday.
Moisture availability will be similar to yesterday but winds will be weaker, so even with a sea breeze and gulf breeze developing there will be weaker convergence in the low levels and near the surface.
341 PM EDT Sat Apr 22 2023 An upper level trough will persist across the Great Lakes and Ohio Valley into Sunday.
1206 PM CDT Sat Apr 22 2023 A broad trough has settled over the eastern CONUS early this morning. The primary trough axis traversed the Mid-South yesterday and is currently affecting the Upper OH River Valley. MJ A cold front has allowed for overnight temperatures to drop into the 40s across the Mid-South. Expect temperatures today to be cooler with highs in the mid 60s to low 70s.
225 PM EDT Sat Apr 22 2023 A cold front will move through the area through this evening. High pressure will build into the region Sunday.
Key Messages: - Near or record cold freezing temperatures Sunday morning.
141 PM PDT Sat Apr 22 2023 Cooler near the coast today with continued warm conditions in the low deserts.
112 PM MST Sat Apr 22 2023 Warm temperatures will continue into Sunday with most lower desert locations reaching the lower to middle 90s with just a bit of high level cloudiness into Sunday morning.
/16 **************************** Previous **************** Zonal flow aloft will be in place through the weekend as a longwave trough remains in place over the Great Lakes region. At the surface, a cold front, which is currently moving through our area early this morning, will fully pass through the region by mid to late morning. 5 inches) will advect into the region as strong high pressure builds across much of the US. Highs for both Saturday and Sunday will range from the mid 70s to the low 80s.
1214 PM CDT Sat Apr 22 2023 (Rest of Today) A cooler and drier airmass continues to advect into the Tennessee Valley this morning behind a cold front that brought widespread showers and thunderstorms last night.
A cold front is just to the north of the area and will also continue to push south overnight across the area.
155 PM MDT Sat Apr 22 2023 19Z upper level analysis has deep trof across the north central CONUS with ridging along the West Coast. Cold northerly boundary layer flow in place as Canadian high pressure settles over the area. Upper trof over the north central CONUS will gradually shift east overnight as western ridge builds over the Northern Rockies.
Decreasing cloud cover is briefly expected this evening and into the overnight as a short-lived ridge of high pressure moves through the region. A few of the high resolution model guidance show a couple of afternoon showers in Idaho, but most of the radar projections have showers holding off until the evening.
Sunday night, a small 500 hPa ridge builds over ahead of disturbance moving in from the Gulf of Alaska.
A weak polar stream cold front, currently pushing south toward northern portions of the area, will not do much other than to reinforce the baroclinic zone currently in place across the Gulf Coast region and drop temperatures just a bit more.
Another round of light showers will cross the area this afternoon and evening as cold air aloft associated with the upper low centered near the Great Lakes aids destabilization. Lingering showers overnight will be limited to the ridges as westerly flow provides orographic lift of the still-saturated, cold airmass. Cooling temperatures may allow snow to mix with rain at the highest elevations, but little accumulation is expected.
The end result has been a convective line of showers along the cold front that has easily produced some small graupel and even some lightning strikes. Showers taper off this evening with the loss of daytime heating and as the trough axis begins to move out.
Some of the high cloudiness should persist into the overnight.
Not expecting much of this activity to reach the ground, as there is lots of dry air in the lower portions of the atmosphere. However, a cold front, currently located north of I-30 across SE Oklahoma and adjacent SW Arkansas, will start to shift southward during the evening and overnight hours. These below normal temps will continue into Sunday, as highs will struggle to reach the low to mid 60s due to the rain and cloud cover.
A reverse cloud line has been trying to develop along the Lower Keys, and briefly spawned a very weak shower, but it died as quickly as it began. A weak cold front will approach the Florida Keys coastal waters tonight and filter through into Sunday, with winds briefly becoming northerly after its passage. High pressure then moves into the eastern United States Sunday night leading to winds quickly clock around to east and southeast.
200 PM EDT Sat Apr 22 2023 A cold front will move through the area through this evening. High pressure will build into the region Sunday.
An upper level ridge along the West Coast and an upper level trough to our east will support northwest flow over the area today. Mostly cloudy skies this morning will decrease to partly cloudy this afternoon as the ridge gradually shifts east. Highs today will be 5-10 degrees warmer than yesterday, which will still be a few degrees below normal. However, if clouds take longer to clear, highs could end up a couple degrees cooler than the current forecast in some areas. Low to mid level clouds will obscure mountain ridges above 4500 ft MSL at times.