Aikyam-Lab/Synoptic-Bench huggingface dataset:
352 AM MST Mon Dec 2 2024 -Highly variable temperatures through the period as a frontal boundary wavers over the region -Warmest day will be Tuesday as warm Pac air spreads over the area -Mainly dry in the period with chances for light snow and flurries with any passing system, best chances over northwest SD Water vapor shows upper ridge over the Pac NW with northwest flow across the Northern Rockies and Northern Plains. Flat upper ridge and arctic boundary shifts even further to the northeast Tuesday and will result in the warmest day of the week, with highs mostly in the 50s and some lower 60s in the lee of the Black Hills.
309 AM CST Mon Dec 2 2024 - Cold front this morning will lead to a chilly day today.
Winds aloft remain weak under the col forming between the northern stream and the low expanding into the Southwest.
- The coldest day of the forecast will be today (Monday) with high temperatures in the lower 20s to lower 30s.
* Freezing fog will persist this week, being most extensive where it has lingered for the past couple of days. Areas of freezing fog and stratus are in the forecast for the next couple of days during the early morning hours particularly in the valley areas. A Freezing Fog Advisory has already been issued this morning for portions of the CWA observing these conditions. When looking at the latest RAP upper air analysis, the CWA is underneath a large upper air ridge residing over the western CONUS while an embedded upper air low advances towards the coast of Northern CA.
Visibility in the Rogue Valley and Umpqua Basin have been under a mile and the lower visibility under 3 miles is expected to continue through the morning. With temperatures below freezing in the Rogue Valley, freezing fog is present and conditions will be similar to yesterday with freezing possible on roads where the fog lowers, especially on overpasses.
745 AM EST Mon Dec 2 2024 An upper level trough will remain to our north across eastern Canada through Tuesday.
513 AM CST Mon Dec 2 2024 - A cold front moves through this morning. A cold front will move through this morning.
532 AM CST Mon Dec 2 2024 - Cold front this morning will lead to a chilly day today.
WEATHER PATTERN OVERVIEW: Upper ridge continues to build across the west with northwest flow still into northeast Montana. High pressure slides through the Dakotas today for one last very cold day.
508 AM CST Mon Dec 2 2024 (Today) Latest observation trends suggest isolated potential for some freezing fog early this morning across parts of NW AR, but will not include any mention at this time given the very low coverage expected. Reinforcing push of cooler air/dry frontal boundary poised to move into NE OK around mid morning. The cooler air will be slower to translate south today, therefore NE OK and NW AR will the see greater differences in high temps today(low to mid 40s) than those observed yesterday.
500 AM CST Mon Dec 2 2024 (Monday through Tuesday) This morning's surface analysis reveals a cold front situated just to the south of the region, which is expected to gradually wash out. Another cold front extends from northeastern Colorado into central Kansas, poised to strengthen as Canadian high pressure builds southward through the central U. This secondary cold front will usher in reinforcing cool air by this evening, particularly impacting our northern zones. Behind the cold front, cooler conditions will prevail on Tuesday. While this cold front will deliver a noticeable cool-down, it is not expected to bring any precipitation to the region. Looking aloft, large trough that has been centered over the eastern CONUS will also begin to break down and push east with weak ridging starting to build into central Texas.
244 AM MST Mon Dec 2 2024 KEY MESSAGES: - Ridge of high pressure through mid week causing stable conditions with valley fog and stratus. - Chance of freezing rain late this week, mainly northwest Montana.
The only exception will be along the Lower Colorado River Valley, where breezy northerly winds are expected each afternoon through the end of the week.
(Today through Tuesday) 500mb analysis continues to show a broad longwave trough across the eastern portion of the country. At the surface, strong high pressure will also dive southward from the upper midwest into the Lower Mississippi River Valley.
527 AM CST Mon Dec 2 2024 (Tonight through Tuesday night) Key Message: -Increasing rain chances tonight into tomorrow Little change to the overall synoptic pattern for the short term period with a deep trough over the eastern CONUS, quasi-zonal flow across South Texas and ridging across the Rockies with a developing low just off the coast of N. Lifting near the surface will be from an inverted trough along with some weak isentropic lifting. Afternoon highs today will range in the 70s and from the low 60s to low 70s tomorrow with the cooler temperatures out west. Overnight lows tonight will be in the low 50s across the northern tier of counties with mid 50s inland and 60s along and near the coast.
337 AM CST Mon Dec 2 2024 Today through tonight: A few areas of fog and freezing fog are possible this morning, and this should dissipate shortly after sunrise. A persistent longwave trough over the eastern CONUS will maintain northwest flow over the lower MS Valley region, and this will send the next cold front through the forecast area this evening followed by a significant intrusion of polar air. After a sunny day with temperatures rebounding well into the 50s to lower 60s, we'll see temperatures drop steadily behind the cold front to near or just below freezing by daybreak Tuesday.
Daybreak temperatures will be mostly in the low to mid 20s. Cold wx will remain with us this week as a longwave trough stays locked in across the eastern US. Most of the "action" will be just flurries, and perhaps some liquid sprinkles during the warmer hours of the afternoon. Today's disturbance will be accompanied by another cold front passage, so we will get a reinforcing shot of chilly air tonight through Tuesday night.
Quiet and dry weather continues this period, as weak upper ridging is noted. Will see a weak and shallow cold front slide south across the plains early this morning that will help with slightly cooler temps today. Don't think this will be widespread, but mainly for areas across the lower Ark Valley and over the far eastern plains where the air is slightly cooler.
Mid level moisture is limited, though combination of synoptic lift and orographic lift may be enough to squeeze some moisture out at the highest elevations. Any flurries or snow showers will be isolated to the higher elevations above 1500-2000ft.
A reinforcing cold front moving through the Ozarks and westward across Oklahoma is still progged to advance into the region late this afternoon into the evening, resulting in another cold night.
Notably, however, the low levels remain very dry across our forecast area per the 12Z OHX sounding, with surface dewpoints down in the teens and a PWAT of just 0.
There will be some high clouds at times from systems passing over the top of the strong high pressure ridge over the eastern Pacific.
Beautiful sunrises and sunsets continue, thanks to yesterday's weak trough streaming mid-and high-level moisture into the region. A secondary weak area of low pressure will approach the southwestern coast this evening, which has returned mid- and high-level clouds to southern Nevada, southeastern California, and northwestern Arizona. Meanwhile, a longwave ridge of high pressure will continue to set up across the western CONUS. Tonight's weak low will remain situated over the region through midweek as a result of Rex Blocking (due to the strong high pressure to the north, effectively trapping the low beneath it), though impacts from this low will be minimal, if any. Late-week, a weak open wave will ride along the upper-level ridge, weakening it enough to break the Rex Block pattern.
121 PM MST Mon Dec 2 2024 - Dominant ridge holds in place through most of the upcoming week. The blocking feature settled along the west coast will continue to deflect weather systems well into Canada, and keeps the cold winter air away from the area. West of the Divide, remaining cold pools and remaining surface snow cover will keep temperatures right near normal, with highs right around freezing and lows in the upper single digits to middle teens. Models continue to note the ridge finally breaking out of its position near this weekend, opening WY up to a more active storm track from Canada. The ridge shifts west off the PacNW coast, which puts the more active pattern into our area.
Updated at 224 PM CST Mon Dec 2 2024 - Cooler temperatures tonight into Tuesday behind a cold front.
A reinforcing cold front moving through the Ozarks and westward across Oklahoma is still progged to advance into the region late this afternoon into the evening, resulting in another cold night. A reinforcing cold front moving through the Ozarks and westward across Oklahoma is still progged to advance into the region late this afternoon into the evening, resulting in another cold night.
This may also happen in areas where temps are below freezing. a new cold front will drop SE into the state this afternoon. Temps look to warm well above freezing by the time any precip moves into the state to see all rain. yet another cold front will push through the state from the north. with warmer conditions and better rain chances possible by the end of the forecast. (18Z TAFS) High pressure will continue to build into the region through the period with widespread VFR conditions expected. Proceeding this area of high pressure, a cold front will move across the TAF sites this afternoon through early evening with an associated wind shift to the W/NW. As the high does build in, winds will shift back to more of an E/SE direction.
Quiet, cool and dry conditions continue this afternoon as a short wave trough continues to dominate the pattern. A reinforcing cold front is expected to move through later tonight into tomorrow morning, bringing even colder temperatures to the area, necessitating a freeze warning and frost advisory for our northern counties.
A surface anticyclone will shift from western North Dakota this morning to over the lower Missouri river basin Tonight, pushing the surface cold from now near the southern Kansas state line into central Texas. The High pressure shifts east into the Upper Midwest and the winds turn back out of the southwest and returning to breezy (15-30 mph) in response Tuesday.
Cold temperatures are forecast for the Midsouth tonight, following an evening cold frontal passage.
- Generally dry and warmer than normal weather is favored through much of this forecast. (This evening through Tuesday night) A backdoor cold front has made its way into the northeastern Panhandles resulting in a chilly day across that area, but the front will retreat through the rest of the day. out of the west-southwest Tuesday night, and these downsloping winds will result in relatively warm lows ranging from the low-30s to around 40 degrees.
We are kicking off the work week with some beautiful, albeit breezy, weather! As of 10 AM EST, temperatures along the island chain were in the mid 60s, and dew points from the mid 40s to the lower 50s. To put this into perspective, 24 hours ago we had temperatures that had just reached near 70F accompanied with dew points in the low to mid 60s. The cold front that had moved through yesterday has put in some work. in the spring or summer, but the cold front from yesterday brought exceptionally dry air with it. Winds will turn more northeast to east beginning mid-week and decrease to gentle to moderate speeds as high pressure settles into the southeast United States, and eventually southward over the Florida Peninsula.
At 9 AM MST satellite and webcams continue to show dense fog in the Lower Treasure Valley and near the Snake River all the way to Glenns Ferry, and also in central Malheur County. Current Dense Fog Advisory for the Lower Treasure Valley is set to expire at 11 AM MST but we will extend it until 2 PM MST.
A batch of meager mid level moisture is moving across the northeast portion of the area resulting in mid to high clouds which will make Red Willow, Decatur, Norton and Graham counties to struggle to make it above freezing. Record high temperatures for the day are in the low 70s for both Burlington and Goodland so it's not out of the realm of possibility for some localized record highs if temperatures can overachieve but at this time seems unlikely to occur.
High pressure over the region will produce dry weather through at least the middle of the week, with areas of clouds and fog in the interior valleys and sunshine elsewhere. Water vapor imagery reveals little change in the overall pattern this morning as high pressure remains firmly entrenched over the Pacific Northwest.
As the low-level warm air advection along the Rio Grande continues to slowly expand eastward, this cloud deck will continue to shift eastward overnight.
Cold and very dry air has settled in with the ridge. The center of the ridge will move over Missouri and eastern Kansas tonight. Tuesday, the area high pressure will move into the southeastern US while northwest flow continues aloft. Anti-cyclonic flow around ridge will bring our winds back out of the southwest as it passes to our southeast.
A weak surface wave reflection was located in southeast MO along a cold front entering IL, MO and northwest AR. The wave will arrive in the central and eastern OH valley this evening bringing the cold front through TN into north AL. Temperatures should bottom out in the lower to middle 20s by sunrise.
1014 AM MST Mon Dec 2 2024 -Highly variable temperatures through the period as a frontal boundary wavers over the region -Warmest day will be Tuesday as warm Pac air spreads over the area -Mainly dry in the period with chances for light snow and flurries with any passing system, best chances over northwest SD Water vapor shows upper ridge over the Pac NW with northwest flow across the Northern Rockies and Northern Plains. Flat upper ridge and arctic boundary shifts even further to the northeast Tuesday and will result in the warmest day of the week, with highs mostly in the 50s and some lower 60s in the lee of the Black Hills.
(18Z TAFS) The axis of a strong high pressure system eases southeast over the Mid-South through Tuesday, maintaining a light north to northeast wind component. /10 (Now through Tuesday Night) The local area continues under a dry northwest flow at high levels with broad upper trough aligned over the eastern US. Wind becomes more east to southeast albeit light by Tuesday night as the pressure ridge slips across the southeast US. With clear skies and light wind in place, overnight lows tonight dip to at, or below freezing up along the US Highway 84 corridor while mid 30s closer to I-10.
A largely persistent synoptic pattern will dominate the short-term period, characterized by a deep longwave trough over the eastern CONUS, quasi-zonal flow across South Texas, and a ridge positioned over the western CONUS. At the surface, a high pressure system centered over the Northern Plains will gradually shift southeast, settling over the Southeastern United States by Tuesday. Widespread overcast skies will blanket the region through Tuesday night, suppressing high temperatures to the low 60s to the low 70s.
1141 AM CST Mon Dec 2 2024 (Tonight through Tuesday night) Key Message: -Increasing rain chances tonight into tomorrow Little change to the overall synoptic pattern for the short term period with a deep trough over the eastern CONUS, quasi-zonal flow across South Texas and ridging across the Rockies with a developing low just off the coast of N. Lifting near the surface will be from an inverted trough along with some weak isentropic lifting. Afternoon highs today will range in the 70s and from the low 60s to low 70s tomorrow with the cooler temperatures out west. Overnight lows tonight will be in the low 50s across the northern tier of counties with mid 50s inland and 60s along and near the coast.
1147 AM CST Mon Dec 2 2024 (Today through Tuesday) The most recent surface analysis indicated a trough of low pressure along the east coast of Mexico and over the western Gulf of Mexico. During the period, this trough will ease to the west, with closed low pressure eventually developing along the Lower Texas Coast. Finally, building seas along the Lower Texas Coast will produce a High Risk of rip currents at the local beaches during the entire period.
1229 PM MST Mon Dec 2 2024 KEY MESSAGES: - Ridge of high pressure through mid week causing stable conditions with valley fog and stratus. The ridge of high pressure continues to strengthen over the Northern Rockies for the next couple of days. This feature has the potential to cause enough mixing at the top of the stratus cloud deck to cause localized flurries and/or freezing drizzle, but impacts should be minimal.
1119 AM CST Mon Dec 2 2024 - Slightly cooler temperatures for today with breezy conditions early in the day.
As of late morning, a cold front was located from near a Okemah to Jay line extending into southwest Missouri. (Today) Latest observation trends suggest isolated potential for some freezing fog early this morning across parts of NW AR, but will not include any mention at this time given the very low coverage expected. Reinforcing push of cooler air/dry frontal boundary poised to move into NE OK around mid morning. The cooler air will be slower to translate south today, therefore NE OK and NW AR will the see greater differences in high temps today(low to mid 40s) than those observed yesterday.
1133 AM CST Mon Dec 2 2024 - Light snow will be falling during the morning commute today, with areas of eastern Iowa seeing the lowest visibilities between 5 AM and 9 AM.
Arctic high pressure and well below normal temperatures will follow for the middle of this week.
As a result, cool and dry continental air will fill in its wake bringing yet another night of near to just below freezing temperatures to all of our inland counties and mid to upper 30s for our coastal counties. Gustier winds filling in behind the cold front out of the north will also support some stronger mixing in the afternoon creating a very dry environment with inland dewpoints struggling to reach the 30s.
High pressure will bring generally nice weather through the week. (This afternoon through Tuesday) Mostly clear skies are observed across the Bay Area and Central Coast as the stable ridge pattern becomes entrenched in an omega block. Some of the warmer spots may hit 70, including San Jose.
Discussion: Longwave troughing will persist across the eastern CONUS. The most impact looks to be across the higher elevations of the E TN mountains overnight, where a brief period of orographic lift in the northwest flow will enhance snowfall, with 2 to 4 inches possible this evening through tonight.
1130 AM CST Mon Dec 2 2024 - A cold front moves through this morning. A cold front will move through this morning.
Tonight through Tuesday night High pressure will remain in place over northern Nevada and the Pacific Northwest through tomorrow night. A low pressure system is developing over California, and will extend into southern Nevada. Scattered clouds may move into Nevada tonight due to the low, but mostly sunny conditions are expected today and tomorrow.
1138 AM CST Mon Dec 2 2024 - Cold front this morning will lead to a chilly day today.
The strong surface anticyclone will dive south to near Kansas City by sunrise Tuesday, with light winds veering easterly then southerly through 6 am Tuesday. Radiational cooling will be near ideal levels at least through this evening, allowing for another widespread hard freeze, in the teens across northeast zones, to mainly the lower to mid 20s elsewhere.
High pressure will move into the West, prompting warmer weather with Santa Ana winds by later in the week.
515 PM CST Mon Dec 2 2024 (The rest of this afternoon ) Cold front continues to push southeastward across the area this afternoon with temperatues in the 40s to the north despite full sun. Much cooler lows tonight as winds subside and skies remain mostly clear.
333 PM PST Mon Dec 2 2024 High pressure will bring generally nice weather through the week. (This afternoon through Tuesday) Mostly clear skies are observed across the Bay Area and Central Coast as the stable ridge pattern becomes entrenched in an omega block. Some of the warmer spots may hit 70, including San Jose.
Tuesday looks like a mainly sunny and cool day followed by another night of frost and some freezing temperatures in about the same areas as tonight. Quiet, cool and dry conditions continue this afternoon as a short wave trough continues to dominate the pattern. A reinforcing cold front is expected to move through later tonight into tomorrow morning, bringing even colder temperatures to the area, necessitating a freeze warning and frost advisory for our northern counties.
Meanwhile, a reinforcing cold front just to our north will sweep across the region this evening and overnight with winds increasing from the north northeast as fropa occurs. In wake of the cold front on Tuesday, we look to shave off around 10 degrees from high temperatures as compared to today's numbers. So instead of lower to mid 60s, expect the majority of the region to top out somewhere in the 50s on Tuesday afternoon with a few possible exceptions in the lower 60s across parts of Deep East Texas. Moving ahead to Tuesday night, a developing coastal low along the cold front near far South Texas will slowly begin to lift inland along with increasing Gulf moisture.
The upper level pattern over the CONUS is highlighted by broad troughing over the central and east with a ridge over the west. An open low sits under the ridge, just off the southern California and Baja coast. This low should gradually move over the desert southwest over the next few days, while the ridge axis itself shifts east. As a speed max rounds the base of the southwest trough tonight and tomorrow, an associated surface pressure gradient will tighten.
Look for another frosty start to Tuesday morning, with inland low temperatures near freezing. As a result, cool and dry continental air will fill in its wake bringing yet another night of near to just below freezing temperatures to all of our inland counties and mid to upper 30s for our coastal counties. Gustier winds filling in behind the cold front out of the north will also support some stronger mixing in the afternoon creating a very dry environment with inland dewpoints struggling to reach the 30s.
Ridging aloft continues to be the predominant feature across the Desert Southwest. This upper-lvl pattern has been stagnant over the last week and a half and is here to stay through at least this weekend, bringing quiet weather conditions and well above normal temperatures to the lower deserts. Today still looks to be the warmest day of this week with temperatures rising solidly into the lower 80s across the Phoenix Metro this afternoon. Heading into Tuesday, a weak disturbance will undercut the ridge of high pressure and begin to move into CA. Despite the reductions in hghts aloft, temperatures are not going to feel noticeably cooler.
Temperatures are expected to bottom out at or below freezing for the vast majority of sites across the CWA in the wake of the cold front that traversed the area early today. Luckily this continuous cold air advection will not bring particularly fast winds, with the highest wind speeds being in the low teens.
538 PM CST Mon Dec 2 2024 Cold temperatures are forecast for the Midsouth tonight, following an evening cold frontal passage.
451 PM CST Mon Dec 2 2024 Updated at 444 PM CST Mon Dec 2 2024 - Cooler temperatures tonight into Tuesday behind a cold front.
309 PM PST Mon Dec 2 2024 High pressure will bring generally nice weather through the week. (This afternoon through Tuesday) Mostly clear skies are observed across the Bay Area and Central Coast as the stable ridge pattern becomes entrenched in an omega block. Some of the warmer spots may hit 70, including San Jose.