Aikyam-Lab/Synoptic-Bench huggingface dataset:
557 PM CST Mon Dec 11 2023 (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.
Issued by National Weather Service Pittsburgh PA 412 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. There may be a few lingering flurries in the highest elevations, but those too should dissipate by sunset. 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.
913 PM EST Mon Dec 11 2023 High pressure will remain in control across the area through much of the week. An area of low pressure may approach from the south during the second half of the weekend. Clear and cold overnight as high pressure builds in and winds become light and variable. High pressure will continue to build toward the area from the southwest tonight. High pressure will build just to our south and east tomorrow, allowing light southerly flow to develop at the surface. High pressure will strengthen off to our northwest tomorrow night, resulting in another night with clear skies and light winds.
242 PM PST Mon Dec 11 2023 Dry conditions and seasonable temperatures are expected for the next several days as ridging builds over the west coast. Otherwise dry conditions remain in store as ridging builds over the west coast through mid week.
Temperatures will remain warmer than normal through Tuesday, with a brief cool down mid to late this week as a weather system passes through the area.
Sub freezing temperatures are expected again tonight, with a slow warming trend for most of the work week.
For this afternoon, southerly flow and warm air advection through the lower levels appears to finally be clearing some of the low clouds out of southern WI gradually, with clearing possible by the late afternoon for portions of central WI as well. Tonight, despite the brief clearing, clouds will come back fairly quickly overnight as a cold front crosses the region. Tuesday, colder air behind the cold front will keep temperatures cooler, with highs ranging from the lower 20s to lower 30s. Temperatures late this week and this weekend look to trend 10-15 degrees warmer than normal for mid December.
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. /NEW/ /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.
1221 AM EST Tue Dec 12 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.
947 PM PST Mon Dec 11 2023 Stratus and fog will be the norm as high pressure settles over the region. Meanwhile temperatures should fluctuate either side of the freezing mark through the week. Most web cams and surface observations show limited fog coverage this evening, with the highest focus over southeast Washington around Alpowa Summit, Colfax, and Ritzville.
However, breaking clouds are anticipated toward dawn, as inversion heights fall and surface ridging builds into the area from the Southern Appalachians. High pressure centered over North Carolina should ensure fair weather across Central PA later today. Increasing warm advection ahead of an approaching cold front should result in afternoon temps a few degrees above seasonal averages over much of the forecast area with highs of 40-45F. An upper trough tracking to our north will push a moisture- starved cold front through the region tonight.
1048 PM CST Mon Dec 11 2023 (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.
157 AM MST Tue Dec 12 2023 Soundings along the foothills west and south of Billings indicate a shallow, saturated layer at the surface with dry air aloft into the dendritic growth zone, indicating the potential for freezing drizzle to occur. Freezing drizzle and areas of fog will persist through around 9 AM. Winds will switch to be from the west, and upper ridging enters the area for the foreseeable future.
Cloud cover will continue to decrease from southwest to northeast under increasing subsidence and as warmer, drier air moves in aloft. The only real impact will be an increase in cloud coverage and limited radiational cooling potential as, the low levels remaining mixed overnight.
/Today through Monday/ Key Messages: -Cooler today with a few scattered flurries tonight.
(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.
1234 AM EST Tue Dec 12 2023 Dry high pressure will linger over the area today.
Dry and clear today with high pressure in control. Discussion: Zonal flow aloft and low-level ridging will result in a warming trend today with temperatures closer to seasonal normals.
High- res models still in some disagreement regarding progression of this feature as upper low slowly sags south out of Oregon and closes off over northern Nevada this morning. Given current temperatures, opted to issue a Freezing Fog Advisory for the Lower Snake, Raft River, Marsh Valley and Cache Valley regions. Could foresee the fog spreading into the Bear Lake and Gem Valley areas as well, and perhaps the Eastern Magic Valley, though at time of issuance temperatures across the Eastern Magic Valley were marginal to support the Freezing Fog Advisory. Center of closed low drops all the way to the Las Vegas area by tonight.
Surface analysis early this morning shows strong high pressure in place across the southeastern states. This trough extended from deep low pressure found northern Ontario. Another area of high pressure was found over the northern plains. Aloft, water vapor showed a deep low near Hudson Bay, and a second trough was found over the northwestern United States. GOES16 shows clear skies across Central Indiana and light southerly winds were in place ahead of the trough. Forecast soundings and time heights show a dry column through the day as this trough axis passes. Weak warm air advection is in play ahead of the trough and also due to the previously colder air mass departing to the east. Look for highs in the lower to middle 40s.
This system will drive a sfc cold front across Se Mi late this morning. Post frontal cold air advection will be offset to a degree by a steepening of the low level lapse rates which will sustain afternoon temps in the 30s (with a few low 40s across the far south).
338 AM EST Tue Dec 12 2023 High pressure will control weather in the Ohio Valley for the remainder of the week. After a dry cold front crosses the region early tonight, strengthening high pressure will allow the airmass over the region to warm a little each passing day. A weak cold front will approach the Ohio Valley from the northwest this afternoon.
1059 PM CST Mon Dec 11 2023 (Rest of tonight) High pressure is centered from the Mid-Atlantic southwestward into eastern Tennessee and southern Mississippi/Alabama this evening. Some weak moisture advection can be seen ahead of a pre-frontal trough axis extending southeast into the Missouri Valley area from a cold front diving south from the northern Great Plains region. Further east, temperatures could drop into the lower to mid 20s before they climb a bit as the weak moisture advection shifts further east towards daybreak. Not thinking winds will increase much until around or just after daybreak, so there is a good possibility that some patchy freezing fog or small areas of freezing fog could occur overnight.
BT 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.
Issued by National Weather Service Pittsburgh PA 148 AM EST Tue Dec 12 2023 Clouds will continue to clear tonight as high pressure builds to our west.
A downstream plume of scattered to broken MVFR stratocu will linger there as clouds associated with the cold front approach from the upper Midwest and merge toward sunrise. The cold front is still expected to move through the region with no precipitation but does support a band of MVFR clouds spreading NW to SE across the terminal corridor. 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.
Temperatures across south central and southeast KS will climb into the low to mid 50s while much of central KS will be limited to the low and mid 40s due a slow moving cool front sagging south across the area. Another, weaker trough will dive south into the four corners region throughout the day today. Consensus continues to show this feature becoming a closed low as it digs further into the Desert Southwest tonight into tomorrow.
Light winds remained northwesterly overnight, behind a passing cold front. The primary precipitation type will be snow potentially mixed with rain at times, as temperatures are only forecast to reach the low to mid 30s this afternoon.
Model guidance remains in good agreement on temperatures in the low to mid 40s north of Interstate 4 with remaining areas in the upper 40s to mid 50s by daybreak.
Temperatures will fall into the lower 20s to lower 30s by sunrise. Even under full sunshine, temperatures are only rising into the low to mid 50s with a few 40s still left across the far northeast counties. Guidance typically has a hard time realizing how cold temperatures can drop in our normally cooler spots such as Gadsden, Jasper, and northeastern valley locations. We could be looking at a favorable setup for fog development due to the warmer water conditions and ideal radiational cooling. I've gone ahead and placed patchy and areas of freezing fog in the forecast for locations adjacent to these river basins and lakes.
(Tonight through Monday) An upper level trough axis will dig and close off in the vicinity of the 4 corners region over the next few days.
846 PM PST Mon Dec 11 2023 Stratus and fog will be the norm as high pressure settles over the region. Meanwhile temperatures should fluctuate either side of the freezing mark through the week. Most web cams and surface observations show limited fog coverage this evening, with the highest focus over southeast Washington around Alpowa Summit, Colfax, and Ritzville. Winds decrease as high pressure settles over the region, the stratus and areas of fog will expand across the low lands with a degradation of ceilings and visibilities by Tuesday morning.
In the upper levels, a couple of broad troughs will swing through the northeastern CONUS this week, as high pressure holds southeast of Florida. At the surface, broad high pressure sprawling north of Florida and weak troughing over the Caribbean will favor a tight pressure gradient across the forecast area, resulting in rather breezy northeast winds.
105 AM EST Tue Dec 12 2023 High pressure will build in for most of the week bringing cool and dry weather to the region. Strong radiational cooling thus far has brought much of the region to around or below the freezing mark away from the immediate coast. 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.
(Rest of tonight) High pressure is centered from the Mid-Atlantic southwestward into eastern Tennessee and southern Mississippi/Alabama this evening. Some weak moisture advection can be seen ahead of a pre-frontal trough axis extending southeast into the Missouri Valley area from a cold front diving south from the northern Great Plains region. Further east, temperatures could drop into the lower to mid 20s before they climb a bit as the weak moisture advection shifts further east towards daybreak. Not thinking winds will increase much until around or just after daybreak, so there is a good possibility that some patchy freezing fog or small areas of freezing fog could occur overnight.
253 AM EST Tue Dec 12 2023 Dry high pressure will linger over the area today.
Cold air under this ridge has produced freezing temperatures for all of the forecast area with temperatures ranging from the mid 20s to lower 30s and light winds.
210 AM CST Tue Dec 12 2023 Key Message: * Dry with seasonable temps Cold front will move across the area this morning with no impact on weather besides a wind shift to northwest.
Issued by National Weather Service Pittsburgh PA 1146 PM EST Mon Dec 11 2023 Clouds will continue to clear tonight as high pressure builds to our west.
350 AM EST Tue Dec 12 2023 High pressure builds into the area today then weakens slightly with the passage of a cold front tonight.
1116 PM CST Mon Dec 11 2023 - After 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).
235 AM EST Tue Dec 12 2023 Dry and cool through the rest of the week with high pressure prevailing.
845 PM PST Mon Dec 11 2023 A trough aloft will bring several degrees of cooling Tuesday, but temperatures will still be above average for mid December.
This may allow for some decent stratocumulus clouds this afternoon with the cooler air in the lower levels coming in, and due to the diurnal boost.
1240 AM EST Tue Dec 12 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.
1003 PM EST Mon Dec 11 2023 Dry high pressure will linger over the area through Tuesday.
As this occurs, and the center of high pressure moves up the OH River Valley on Wed, a backdoor cdfrnt wl slide across the N/Ern half of AR, driving a reinforcing shot of continental dry and cool air into place.
Cool high pressure has sunk into the region behind the cold front, and temps are in the teens and 20s. Our region will be under the influence of broad upper ridging midweek, while the closed low crosses the Four Corners.
High pressure will follow for the remainder of the week and upcoming weekend.
636 AM EST Tue Dec 12 2023 High pressure builds into the area today then weakens slightly with the passage of a cold front tonight.
The dominant weather feature for the remainder of this week will be a ridge of high pressure that builds over the western U. Recent snow and rain will keep moisture in the lower atmosphere, while the terrain traps cooler air near the surface to form valley temperature inversions.
545 AM EST Tue Dec 12 2023 A cold front will bring gusty winds today and cooler temperatures tonight through Wednesday night.
Clearing later this morning, high temperatures recovering to the lower to mid 60s today.
323 AM CST Tue Dec 12 2023 - High pressure will provide tranquil weather through the end of the week with near to slightly above normal temperatures. A quiet weather pattern is forecast to continue through the week as high pressure dominates the weather pattern. Winds will shift to the north/northeast late this afternoon and tonight as a weak cold front passes through. As the week progresses, an upper level ridge will build into the Mississippi Valley as an upper low digs into the Southwest and slowly migrates east into the southern Plains by week's end.
Cloud cover continues to decrease under increasing subsidence and warmer, drier air moves in aloft. While surface winds have been elevated enough to mitigate radiational cooling somewhat, latest obs show some pockets of cooler temperatures, mainly sheltered valleys. The only real impact will be an increase in cloud coverage and limited radiational cooling potential as, the low levels remaining mixed overnight.
Highs will be a touch warmer with readings in the upper 50s to low 60s.
Today & Tonight: A much cooler day is ahead! Taking a look at satellite imagery, mostly clear conditions continue as cooler air funnels into the region behind yesterday's cold front. Expect temperatures to cool a smidge more as we head towards daybreak with most people waking up to chilly temperatures in the low to mid teens. Nonetheless, with lingering cold air advection aloft and limited mixing expected today; temperatures will struggle to reach freezing with highs expected to only get into the low to mid 30s for the day. As a result, decided to half our POPs across the area with the highest chances (10%-20%) expected in far northeastern NE and the Hwy-20 corridor.
535 AM CST Tue Dec 12 2023 (Today through Wednesday afternoon) An upper trough over ID this morning will drop south into NV today developing into a closed low that will continue to sink south into Srn NV overnight. Wednesday this low will wobble into AZ. Readings should be a few degrees cooler Wednesday east of the mountains.
Satellite shows clear skies across the region this morning as high pressure continues to build across the southeast. The only real impact will be an increase in cloud coverage and limited radiational cooling potential as, the low levels remaining mixed overnight.
500 AM MST Tue Dec 12 2023 - Cloudy and cooler today across mountains and plains.
Light winds remained northwesterly overnight, behind a passing cold front. The primary precipitation type will be snow potentially mixed with rain at times, as temperatures are only forecast to reach the low to mid 30s this afternoon. Temperatures will rebound Wednesday and remain above normal through the end of the week, as the previously mentioned trough digs through the southern plains, drawing southerly flow across the nation's midsection.
605 AM CST Tue Dec 12 2023 (Today and tonight) Southwest flow aloft will develop across West Texas today in advance of a developing upper low over the Great Basin region. Despite the increase in cloud cover, temperatures will remain mild again today, with afternoon highs mainly in the lower 60s. Given the increase in moisture and cloud cover, temperatures will be warmer than the past few nights, with overnight lows mainly in the mid and upper 40s.
307 AM PST Tue Dec 12 2023 A trough of low pressure moving through the West will bring cooler weather with some low clouds and fog into early Wednesday.
This may allow for some decent stratocumulus clouds this afternoon with the cooler air in the lower levels coming in, and due to the diurnal boost. Sfc ridging will then build in for Wednesday.
At the surface, high pressure has moved to the east and the low level flow is southeasterly. Temperatures and dewpoints have increased across South Central Texas and are 10 to 15 degrees warmer than 24 hours ago. An upper level trough will drop down from the Great Basin into the desert southwest today and tonight turning the flow to the southwest. In the low levels easterly to southeasterly flow will increase over the next 24 to 36 hours bringing moister air back to the region. Temperatures will be a little cooler out west under the mostly cloudy skies and a little warmer over the east. Cloudy skies and warm advection will mean low temperatures Wednesday morning will be around ten degrees warmer than Tuesday.
800 AM EST Tue Dec 12 2023 A weak cold front will push southeast across the region tonight, then a slow moving area of high pressure will build into the Mid Atlantic region late this week.
458 AM MST Tue Dec 12 2023 This morning a cold front is moving across the Tri-State area bringing a shift in wind direction to the northeast with virga showers moving across the northeast corner of the area. The Tri- State area will be under a weak upper ridge today while a cut-off trough moved over the Western CONUS. Near the surface, the Southern to Central High Plains will be under split flow with high pressure over the Southeast CONUS and an area of low pressure over SW Arizona. Throughout the day, the cut-off trough is expected to develop into a closed low system while moving over the Four Corners. Rain is expected to be the main p-type for those generally east of KS-25 with better potential for snow west of the highway, especially over East-Central Colorado.
556 AM EST Tue Dec 12 2023 A weak cold front will push southeast across the region tonight, then a slow moving area of high pressure will build into the Mid Atlantic region late this week.
427 AM EST Tue Dec 12 2023 A cold frontal boundary will move through tonight with some light lake effect tonight and Wednesday. High pressure then builds into the region later this week and weekend. A moisture starved cold front will move through the region tonight. Ahead of the front, southwesterly flow will bring in a slightly warmer airmass and break up the morning clouds. Highs should get to around 40 or into the low 40's today.
545 AM CST Tue Dec 12 2023 09z/3am surface analysis shows a weak cold front extending from Lake Superior southwestward to near Kansas City. High temperatures will range from the upper 30s far northwest around Galesburg and Lacon to the lower 50s south of I-70. After a cloudy start to the day, increasing amounts of sunshine will be observed during the day Wednesday with highs climbing into the lower to middle 40s.
Sub-freezing temperatures as low as 28 degrees will continue in rural areas of the San Joaquin Valley each night and early morning through Wednesday morning.
(Rest of Today) High pressure continues to promote tranquil conditions across the Tennessee Valley this morning.
(Today and tonight) Southwest flow aloft will develop across West Texas today in advance of a developing upper low over the Great Basin region. Despite the increase in cloud cover, temperatures will remain mild again today, with afternoon highs mainly in the lower 60s. Given the increase in moisture and cloud cover, temperatures will be warmer than the past few nights, with overnight lows mainly in the mid and upper 40s.
An upper low will drop south across Nevada during the day today. Behind the low gusty north winds will develop primarily down the Colorado River Valley on Wednesday.