Aikyam-Lab/Synoptic-Bench huggingface dataset:
1114 AM CST Mon Dec 11 2023 (Today through Tuesday Night) High pressure will begin a slow movement east during the day today, with surface to 850mb winds becoming southerly to southwesterly in nature. Tonight's low temperatures will be a bit warmer than last nights with lows dropping into the upper 30s to 40s inland and into the 50s along the coast. Highs will be in the 60s with some locations in the southern counties and along the coast reaching into the low 70s. Increased cloud cover further south will limit radiational cooling and keep lows slightly warmer with temperatures in the 50s.
High pressure will continue to build into the region in a post-frontal airmass.
Latest surface analysis shows a weak dissipating cold front off the NorCal. Expect a return of coastal stratus and patchy fog this evening into Tuesday morning along with warmer overnight coastal and bayside temperatures.
Min temps this morning were widespread mid to upper 20s, and with high pressure still the main influence tonight, temps overnight should range again from mid 20s to lower 30s. A longwave trough over the central/eastern CONUS will maintain cool/dry northwest flow aloft and a continental polar airmass at the surface. After a freezing start to the morning, sunny skies will allow temperatures to rebound well into the 50s to lower 60s this afternoon across the area.
* A dying cold front arrives Tuesday night, with its only noticeable effect being an increase in high clouds. However, high pressure building in from the west is putting an end to the cold air advection, the frontal inversion is lowering, and heating/mixing is occurring, with the combo allowing for clearing from southwest to northeast. Light southwest flow setting in will keep ridges and open terrain from seeing temperatures fall as much overnight. Warm air advection continues during the day Tuesday as a weak cold front approaches from the northwest. High clouds associated with the front's supporting upper trough are forecast to be on the increase late Tuesday night, but will probably not have much impact on temperatures.
For Tuesday, high pressure will be centered northeast of the area with northeast surface winds maintaining a dry airmass.
/14 (Now through Tuesday) An upper level trough over the eastern CONUS will gradually translate eastward into the western Atlantic by this evening, leaving a zonal flow aloft in place over our forecast area. Another chilly night can be expected tonight with lows around 30 to the lower 30s over most locations along and north of I-10. Lows near the coast will be a little warmer in the mid 30s to lower 40s.
Even so, temperatures will struggle to budge today from the low-mid 30's.
There is a low pressure system that is tracking through central Canada that is currently bring southwest flow to the region, becoming breezy tonight. However this will be a dry front/system for our CWA as there is no moisture in the low levels with the front and most of the upper level forcing will be too far north. Some mid to upper level clouds will be possible tonight Into Tuesday expect largely clear skies as strong high pressure from the west builds into the region. This high pressure will continue to strengthen overhead into tonight.
1029 AM CST Mon Dec 11 2023 (Issued 1030 AM CST Mon Dec 11 2023) Largely quiet conditions through today as low pressure to the north is expected to swing through the northern Great Lakes bringing southwest winds.
1021 AM MST Mon Dec 11 2023 135 AM MST Mon Dec 11 2023 - Cold front will bring light snow to the northern Black Hills and southwestern SD today and Tuesday. A Canadian low pressure system is dragging a cold front into the northern US. As the cold front slides through the CWA today, northwesterly winds will become breezy (15-20 mph with gusts around 30 mph). Temps will warm back into the 40s and 50s for the rest of the week, as split flow develops and upper ridging dominates our weather pattern.
Some terrain enhanced snow also continues in the ridges and Tucker county. Dry conditions and a gradually clearing sky is expected overnight as ridging builds in from the west.
Weak southerly return flow is helping to bring warmer temperatures this afternoon and will continue overnight to advect higher dewpoints into the region. While tonight will still be fairly cool, temperatures should only fall into the mid to upper 30s, given the higher dewpoints. Despite the higher cloud cover, afternoon temperatures should reach the low 60s for most locations due to the increasing southeasterly flow during the day.
1224 PM EST Mon Dec 11 2023 Dry high pressure will linger over the area through Tuesday.
Temperatures tonight are forecast to be about 5 degrees warmer than last night, generally bottoming out in the lower 30s in most locations (a few locations may drop into the mid-upper 20s near the KS/OK border). Mejia (Tuesday through Monday) Mid/upper-level flow will briefly transition to zonal flow on Tuesday, ahead of the next approaching upper-level trough/low that is currently moving across the Pacific NW.
1133 AM CST Mon Dec 11 2023 - After some cooler temperatures on Tuesday, high temperatures will run between 5 and 15 degrees above normal this week (normal highs are in upper 20s and lower 30s).
Temperatures have been staying cool today thanks to a cold front that pushed through yesterday. Clearing skies tonight will allow for temperatures to drop into the 30's and 40's across the area but everyone should stay above freezing with some patchy frost in Levy County.
Stubborn stratus held within the narrowing sub-inversion moist layer likely to persist into the evening with the low level thermal trough still anchored locally. Passing inconsequential flurry plausible as low level flow backs with time and draws a lake aggregate theta-e plume eastward to accompany the gradual exit of the trough axis. Height falls associated with a closed low tracking across northern Ontario will glance across the great lakes Tuesday. Attendant cold front arrives locally during the daylight period.
223 PM EST Mon Dec 11 2023 Dry high pressure will linger over the area through Tuesday.
1043 AM EST Mon Dec 11 2023 After a bout of wintry weather this morning, a drier start to the workweek will soon follow by the early afternoon hours with high pressure building in today and tonight.
316 PM EST Mon Dec 11 2023 High pressure will build in for most of the week bringing cool and dry weather to the region. High pressure will settle into the area tonight and Tuesday, resulting in mainly clear skies and light winds. Highs Tuesday will reach the low to mid 50s.
(Tonight) High pressure will promote tranquil weather across the Tennessee Valley this evening and overnight, with clear/calm conditions continuing. Locations directly along bodies of water will be a few degrees warmer.
241 PM CST Mon Dec 11 2023 - After some cooler temperatures on Tuesday, high temperatures will run between 5 and 15 degrees above normal this week (normal highs are in upper 20s and lower 30s).
1240 PM EST Mon Dec 11 2023 Building high pressure brings drier conditions late today into tonight. A dry cold front crosses Tuesday night, followed by high pressure for the balance of the week. Cloud cover will slowly erode from southwest to northeast late today into tonight, then quiet and mostly sunny conditions are expected for Tuesday as high pressure remains in control. Daytime highs on Tuesday are expected to reach mid 40s to low 50s in the lowlands and 30s to mid 40s along the mountains. High pressure retains residency over the Central Appalachians through the bulk of the forecast period.
1130 AM CST Mon Dec 11 2023 - Patchy freezing drizzle this morning.
259 PM EST Mon Dec 11 2023 Temperatures will warm to near seasonable levels for Tuesday in advance of a cold front.
Temperature are in the lower 70s across the Keys, with dewpoints below 60 for some communities, all thanks to an early morning FROPA. The typical clearing skies after a cold front may not be realized, with copious upper level cloud cover streaming northeast from the Yucatan.
Wed through next Mon night An upper level ridge dominates the pattern for the entire time. Perhaps Mon in this period will result in a wave entering the coast and starting the breakdown of this ridge. Overnight lows may be mild if the stratus hangs in, with mostly 20s in the lower elevations, but if it is clear, more like 10 to 20 deg F. Afternoon highs, if sufficient clearing, will likely be in the lower to middle 40s. As always under high pressure, wind will be of little consequence, save for pushing late night and morning fog around. Improvements expected after 12/18Z with abundant sunshine under high pressure. Wind of little consequence, except for KSUN where a southerly wind could bring in some afternoon impactful CIG if the stratus develops in the lower Wood River Valley, below KSUN.
The brief band of snow showers that accompanied today's cold front has moved out of the area.
1211 PM EST Mon Dec 11 2023 High pressure will continue to keep a dry weather pattern over the Ohio Valley for the remainder of the week.
1112 AM CST Mon Dec 11 2023 (Rest of Today) Tranquil conditions across the Tennessee Valley this morning, with high pressure in control of our weather. Highs today will peak in the upper 40s in our eastern areas along the Plateau to the lower 50s elsewhere across the Tennessee Valley.
1003 AM CST Mon Dec 11 2023 - Patchy freezing drizzle this morning.
101 PM EST Mon Dec 11 2023 Drier with cooler temperatures to start the week before moderating temps by mid to late week as high pressure builds over the eastern seaboard. Upper air analysis shows that the region is currently under the base of an upper trough. This trough is expected to slide offshore through the overnight hours.
A cold front will sweep through the Midwest tonight, as it is already moving through the Dakotas at Noon today. Tuesday will be rather cool and blustery, especially in the morning, as northwest winds continue around 15 to 25 mph continue through Noon, before decreasing in the afternoon as the high pressure center moves in.
A prefrontal trough is currently extended from around Marshall to Sioux Falls to Yankton, with winds gusting into the 20s out ahead. A weak cold front will slide through early this evening, turning winds northwesterly. Mid to high cirrus spreading in from the northwest this evening will begin to clear from the north early Tuesday morning, so dropped temperatures below the NBM deterministic in these areas - resulting in lows ranging from the low teens in southwest Minnesota to around 20 degrees along the Missouri River Valley where clouds will linger longest. Trended slightly warmer than the NBM given recent trends, but fortunately winds will be light.
Sunny skies are expected today with south to southeast winds and afternoon temperatures generally in the low to mid 60s. The increase in cloud cover along with a slight increase in low-level moisture will keep overnight temperatures in the mid to upper 30s, with only a few locations east of I-35 expected to fall into the low 30s. Similar weather is expected on Tuesday, but a deepening upper level trough over the western CONUS will bring a steady stream of Pacific moisture into North and Central Texas.
As an upper level low approaches on Tuesday, cloud coverage increases and low level winds shift southeasterly and bring in moisture.
(Tonight through Tuesday night) The 1024 hPa high pressure centered over the western Gulf Coast this afternoon is forecast to lift northeastward and become centered over the Southeast by Tuesday. The increasing low level moisture combined with greater high level cloud cover are expected to limit the efficiency of radiational cooling and result in warmer overnight lows in 40s.
1142 AM CST Mon Dec 11 2023 - Winds increase this morning, with the peak during the passage of the cold front this afternoon and evening. - Ridge builds eastward mid week, with a transition to NW flow by the weekend. There is a chance (30%) the winds have little affect on the fog this morning and we could see it continue into the early afternoon before the cold front approaches. A short wave moves along the NW flow aloft bringing a trailing cold front to ND and MN.
By Tuesday night, the low level moisture will combine with increasing lift from an approaching vort max and increasing southwest flow aloft to help produce showers across much of the area. Highs on Tuesday are expected to be 5 to 10 degrees cooler than today given the increasing and thickening cloud cover.
Lake effect precip will continue to wind down this morning as midlevel trough axis exits and subsidence inversion heights steadily lower. WAA continues into Tue ahead of a cold front being driven by northern Lakes midlevel trough. Strong subsidence/high pressure then settles into the Ohio Valley for Wed setting us up for some chilly nights with ideal radiational cooling. Slow but steady moderation in temps expected through the weekend as low level ridge slowly moves east. Associated cold front will pass across northern Indiana on Tuesday allowing for steeper low level lapse rates and westerly gusts into the 20-25 knot range.
223 PM CST Mon Dec 11 2023 - High pressure will provide tranquil weather through the end of the week with near to slightly above normal temperatures. A rather uneventful synoptic setup to start off the week as a mid to upper level trough provides slightly unseasonably cold temps.
Low pressure that brought about the weekends active weather continues to lift northeast along the NE CONUS coastline.
1103 AM CST Mon Dec 11 2023 (Today and tonight) Veered low level flow will aid in bringing some warmer air eastward into the area from the higher terrain to our west. This will begin to bring higher dewpoints back northward into the area and along with abundant high clouds will keep temperatures a bit warmer than the last couple of days.
1124 AM CST Mon Dec 11 2023 (Today through Tuesday) Mesonet sites across the northern Coastal Bend into the Victoria Crossroads show temperatures below freezing in low lying areas where drainage effects have occurred. An upper trough moving through the Intermountain West today will drop south into the Great Basin and form into a closed low Tuesday afternoon.
1135 AM CST Mon Dec 11 2023 - Highs in the 50s for most areas today before a cold front moves through the area overnight.
As such, highs will be a few degrees cooler than today with temperatures reaching the upper 30s north to near 50 south.
Generally, we had a quiet afternoon across out area as high pressure is dominating into the state with cooler and drier conditions in the wake of yesterday's cold front. No freezing temps are expected, but some patchy frost is possible across Levy County.
A cold front currently parked over far northeastern ND is making its way towards the CWA. By 00Z the cold front is will be over the MN Arrowhead to northwestern IA to southern NE. As this cold front moves through light snow showers are possible over the MN Arrowhead. There will be some dry air aloft there might be a few pockets of freezing drizzle, but given the lack of confidence on location and timing have kept out of the grids for now.
This week will start with slightly above normal temperatures and widespread mid to high altitude clouds over the Southwestern US, followed by a brief cooldown midweek with the passage of a low pressure system.
633 PM EST Mon Dec 11 2023 Dry weather is expected across the Ohio Valley through the end of the work week thanks to multiple areas of high pressure moving across the region.
(Now through Tuesday) An upper level trough continues to slide over the eastern US this afternoon and will push out over the western Atlantic later tonight. Behind the trough, winds have turned more westerly over the local area. Down at the surface, high pressure is currently situated over the Southeastern US and will continue to dominate through the near term. Upper level clouds filter into the area on Tuesday as upper ridging builds into the central US and winds shift to the southwest.
Today through Tuesday: Water vapor imagery this afternoon continues to show broad troughing over the CONUS, with the leading edge continuing to depart the far northeastern coast. A recent surface analysis shows warmer temperatures as a result of downslope flow coming off the High Plains, with the convergence of a warm front and an encroaching cold front pushing ESE into central South Dakota.
306 PM MST Mon Dec 11 2023 This week will start with slightly above normal temperatures and widespread mid to high altitude clouds over the Southwestern US, followed by a brief cooldown midweek with the passage of a low pressure system.
Any lingering snow showers have generally come to an end this evening as high pressure building eastward has allowed for winds to back to the west-southwest. Some clearing is being noted on satellite across the Lower Susquehanna Valley and this trend will continue into tomorrow. Modified arctic high pressure will dominate the short term period kicking off what should be a prolonged dry spell for the area.
713 PM EST Mon Dec 11 2023 High pressure will build over the region tonight into Tuesday before a cold front pushes east across the local area Tuesday afternoon and Tuesday night.
607 PM EST Mon Dec 11 2023 Drier with cooler temperatures to start the week before moderating temps by mid to late week as high pressure builds over the eastern seaboard. Upper air analysis shows that the region is currently under the base of an upper trough. This trough is expected to slide offshore through the overnight hours.
514 PM CST Mon Dec 11 2023 - After some cooler temperatures on Tuesday, high temperatures will run between 5 and 15 degrees above normal this week (normal highs are in upper 20s and lower 30s).
614 PM EST Mon Dec 11 2023 High pressure will build in for most of the week bringing cool and dry weather to the region. High pressure will settle into the area tonight and Tuesday, resulting in mainly clear skies and light winds. Highs Tuesday will reach the low to mid 50s.
There is high confidence in this being a dry cold frontal passage due to a lack of low-level moisture and given that 100% of ensemble guidance members indicate no precipitation. The primary impact felt with this cold front will be slightly cooler temperatures on Tuesday across northeastern Missouri with highs in the 40s. These cooler temperatures will also be due to increased mid-level cloud cover across northern Missouri. High temperatures across the southern half of the CWA are forecasted to be in the 50s, where there will be more sunshine and less time behind the cold front.
241 PM MST Mon Dec 11 2023 With today's precipitation, use caution driving this evening as slick roads may develop from accumulating snow and/or wet roads freezing up, especially along the foothills. One thing to note, the depth of the upslope flow fueling this activity is relatively shallow, so the higher elevations of Beartooth/Absaroka and Bighorn Mountains are not expected to see much snow. Behind today's cold front, high pressure and clearing skies will allow overnight lows to drop into the mid to lower 20s and teens. Outside of these cooler temperatures, Tuesday will be dry with mostly clear skies and temperatures warming into the upper 30s to lower 40s.
- Colder temperatures are expected on Tuesday with highs in the 30s and 40s behind a cold front that will push into the area tonight.
618 PM EST Mon Dec 11 2023 Dry and seasonal conditions continue through the rest of the week with high pressure overhead.
833 PM EST Mon Dec 11 2023 High pressure and dry conditions will continue through the remainder of the short term. Low pressure that brought about the weekends active weather continues to lift northeast along the NE CONUS coastline.
Made adjustments to overnight cloud cover with this in mind and also the low temperatures.
824 PM EST Mon Dec 11 2023 Drier with cooler temperatures to start the week before moderating temps by mid to late week as high pressure builds over the eastern seaboard.
403 PM EST Mon Dec 11 2023 High pressure will build over the region tonight into Tuesday before a cold front pushes east across the local area Tuesday afternoon and Tuesday night.
957 PM EST Mon Dec 11 2023 High pressure will build over the region tonight into Tuesday before a cold front pushes east across the local area Tuesday afternoon and Tuesday night.
Ridging will give way to a weak low pushing into the region during the middle of the week. Ridging will return as this system moves out of the area during the second half of the week. Temperatures will continue to run a few degrees warmer than normal for mid-December. Dry and mild weather will continue for the next few days thanks to the dry westerly flow aloft as an incoming trough erodes at the weekend's ridge. As this trough digs into Nevada, it will become a cut-off low pressure system late Tuesday morning/early Tuesday afternoon.
932 PM EST Mon Dec 11 2023 High pressure will build in for most of the week bringing cool and dry weather to the region. High pressure will settle into the area tonight and Tuesday, resulting in mainly clear skies and light winds. Highs Tuesday will reach the low to mid 50s.
Despite this, low level warm advection on the heels of southerly surface winds should allow afternoon readings to top out in the lower to middle 60s across the forecast area. /Issued 309 PM CST Mon Dec 11 2023/ /Tuesday Night Onward/ The upper level pattern will amplify during the mid to late week period as an upper low deepens while dropping from the Great Basin to the Desert Southwest, and a ridge strengthens over the Mississippi Valley.
902 PM EST Mon Dec 11 2023 Dry weather is expected across the Ohio Valley through the end of the work week thanks to multiple areas of high pressure moving across the region.
622 PM EST Mon Dec 11 2023 Dry high pressure will linger over the area through Tuesday.
It will form a closed low by Tuesday evening to the south.
609 PM EST Mon Dec 11 2023 Temperatures will warm to near seasonable levels and winds will become breezy on Tuesday in advance of a cold front.
So despite starting several degrees warmer this evening, we'll still fall pretty far overnight. Most areas will be a little warmer tonight than last night thanks to the slight breeze. There is high confidence in this being a dry cold frontal passage due to a lack of low-level moisture and given that 100% of ensemble guidance members indicate no precipitation. The primary impact felt with this cold front will be slightly cooler temperatures on Tuesday across northeastern Missouri with highs in the 40s. These cooler temperatures will also be due to increased mid-level cloud cover across northern Missouri. High temperatures across the southern half of the CWA are forecasted to be in the 50s, where there will be more sunshine and less time behind the cold front.
438 PM CST Mon Dec 11 2023 - High pressure will provide tranquil weather through the end of the week with near to slightly above normal temperatures. A rather uneventful synoptic setup to start off the week as a mid to upper level trough provides slightly unseasonably cold temps.
Issued by National Weather Service Pittsburgh PA 649 PM EST Mon Dec 11 2023 Building high pressure brings drier conditions late today into tonight. A dry cold front crosses Tuesday night, followed by high pressure for the balance of the week. Dry weather is expected overnight as high pressure builds in from the south. Quiet and mostly sunny conditions are expected for Tuesday as high pressure remains in control. Daytime highs on Tuesday are expected to reach mid 40s to low 50s in the lowlands and 30s to mid 40s along the mountains.
818 PM CST Mon Dec 11 2023 - After some cooler temperatures on Tuesday, high temperatures will run between 5 and 15 degrees above normal this week (normal highs are in upper 20s and lower 30s).
607 PM CST Mon Dec 11 2023 (Tonight) High pressure will promote tranquil weather across the Tennessee Valley this evening and overnight, with clear/calm conditions continuing. Locations directly along bodies of water will be a few degrees warmer.