Aikyam-Lab/Synoptic-Bench huggingface dataset:
- There is uncertainty in precipitation type associated with this system, with rain, snow, and freezing rain all possible. Upper level flow remains northwesterly as an upper level ridge continues to build into the area. Highs in the lower 30s northeast to the upper 40s far southwest can be expected today. The ridge will remain flat, putting the state under zonal upper level flow, while above average temperatures will continue, slightly warming each day under the continued westerly flow.
As the low exits to the north, a second closed low is expected to dig in and replace it just offshore of northern California and southern Oregon.
513 AM CST Tue Dec 19 2023 (Today and tonight) Dirty ridging aloft is on pace to exit the region this afternoon ahead of a minor impulse in southwest flow tonight. An abundance of high clouds already in place will remain intact tonight all the while lee troughing sharpens to our northwest and results in breezy downslope winds.
Active weather on deck for the week as a series of low pressure systems impact the region.
An upper level ridge of high pressure currently over the plains states will flatten and translate eastward today with the flow becoming southwesterly by early this evening. A surface trof of low pressure over eastern Colorado and eastern New Mexico is expected to remain in that region today. The overall strongest winds and gusts will likely occur across eastern sections, with the lowest winds in the far northwest sections closest to the surface trof axis.
Mid and high clouds continued to stream northeastward across the region ahead of a trough over the eastern Pacific early this morning.
522 AM CST Tue Dec 19 2023 Dry and cold weather is expected across the Mid-South today as high pressure moves across west Tennessee.
947 AM EST Tue Dec 19 2023 Dry high pressure builds across the region today and lingers into the weekend.
Even cooler tonight, with lows in the mid to upper 30s north, upper 30s to upper 40s central and upper 40s to lower 50s south. Isolated locations across the Nature Coast could fall to or just below freezing, but not expecting widespread freezing conditions for a few hours at this time. High pressure will continue to build in across the waters, with winds continuing to subside through the morning below headlines.
404 AM EST Tue Dec 19 2023 A weak cold front moves through later today, followed by high pressure into Wednesday.
Light mixed precipitation in the form of light freezing rain and snow was reported across west-central and northwest Montana early this morning. the high yesterday was only 20 degrees while the mountains surrounding saw low 40s.
/Issued 1118 PM CST Mon Dec 18 2023/ /Overnight through Wednesday/ Mid level ridging is traversing the Southern Plains tonight resulting in cool and generally calm conditions. Synoptic scale troughing over the far western CONUS and a modest upper jet are helping to spread a fairly thick canopy of cirrus across the region and this will continue into the day Tuesday. Most locations will be spared a freeze given the disruption of optimal radiational cooling from the high clouds. Tuesday night should be considerably warmer with lows in the mid/upper 40s and modest southerly winds.
(Now through Wednesday) A large upper trof oriented over the easternmost states moves off into the western Atlantic as a subtle upper ridge builds into the forecast region. Highs today will be mostly in the lower to mid 50s, then highs on Wednesday tend to be in the mid 50s except for some locations reaching the upper 50s near the coast.
431 AM EST Tue Dec 19 2023 A sharp upper trough will slide east and lift away later today, with zonal flow likely the rest of the week.
For the remainder of today, expect partly cloudy skies with highs once again above normal, topping off in the low to mid 30s. Upper air pattern consists of a 500 mb trough off the west coast, a broad ridge over the Rockies and plains and a trough on the ern coast 12z Tue. Upper ridging moves into the upper Great Lakes 12z Sat with broad troughing in the Rockies. Upper ridging holds over the area 12z Sun into 12z Mon.
551 AM EST Tue Dec 19 2023 Snow showers will taper off today as high pressure begins to build across the region.
947 AM EST Tue Dec 19 2023 Snow showers will taper off today as high pressure begins to build across the region.
430 AM MST Tue Dec 19 2023 Current 500 mb analysis has a trough over Appalachia and a broad upper level ridge situated over the western 2/3 of the country, centered near the Continental Divide, allowing a west to slightly southwest flow over the area.
608 AM EST Tue Dec 19 2023 A dry cold front across SE GA will exit the area later this morning. Dry weather continues as high pressure builds into the southern Appalachians. A Freeze Watch remains in effect for inland SE GA and Suwannee Valley where sub- freezing and freezing temperatures are anticipated.
543 AM CST Tue Dec 19 2023 (Today through Wednesday) Surface ridging shifts east today and will turn our winds from northerly this morning to east and eventually southeast by this afternoon.
Mostly sunny skies will allow temperatures to rebound into the low/mid 50s today, but there is some uncertainty with tonight's lows as cirrus is expected to thicken up in the fast upper level westerlies laden with Pacific moisture, and this could keep lows above freezing.
High temperatures look to remain in the mid 70s today and Wednesday, as the warmer southerly flow helps counteract the cooling effect of the additional cloud cover. The overnight lows Tuesday night will likely be a bit warmer than last night, with temperatures in the mid 50s. The increased cloud cover will limit radiational cooling, while the southerly flow will advect warmer air to the region.
759 AM EST Tue Dec 19 2023 Snow showers will taper off today as high pressure begins to build across the region.
(Rest of Today) The upper trough responsible for the breezy conditions yesterday will continue to shift east off the Atlantic Coast today, while broad upper ridging builds in from the west. Closer to the sfc, high pressure will shift southeast and center near the Tennessee Valley, reinforcing a cooler and dry airmass. With much lighter northerly winds today, the main impact will come from dewpoints in the low to mid teens.
(Today through Wednesday) Strong low pressure has moved well out of the area. Currently, a trailing cold front is moving through the CWA. This front will push south today with high pressure remaining in place through the end of the short term period. Overnight temps are running a little warmer than forecast, due to the elevated winds.
526 AM CST Tue Dec 19 2023 (Today and tonight) An upper level ridge over Texas and the southern Plains will move east to the lower Mississippi Valley by this evening. Highs this afternoon will be in the lower to mid 60s. With this and an increase in surface dewpoints, temperatures will be warmer with overnight lows 47-50 degrees across the area.
Probabilities of snowfall exceeding 8" above 7000 feet are in the 50 to 80% range for near Lassen Peak and for areas south of the Highway 50 corridor.
547 AM EST Tue Dec 19 2023 High pressure will build across the region for mid-week. Snowfall was generally confined to areas west of the Blue Ridge with highest amounts in the higher elevations and along the western slopes of the Appalachian Divide. Forecast today reflects lingering cloud cover and flurries across the mountains, with clear skies prevailing east of the Blue Ridge. It will remain brisk and cold as the the upper level trough which provided for the winter interlude moves east and away from the area. Highs this afternoon will range from near freezing in the mountains to the lower 40s in the piedmont. High pressure will pass overhead tonight.
(Today through Wednesday) Upper troughs moving into New England and the Pacific Northwest. Upper ridging moving out of the Rockies into the Plains States early this morning. At the surface, high pressure was centered over Arkansas. Today's highs probably won't get out of the 50s, but much of the area should be in the lower to middle 60s on Wednesday.
Temperatures will be cool today with highs only a degree or two above freezing. A deep anomalous upper level trof over the east Pacific was helping to support a large positive 500 mb height anomaly over eastern North America. Otherwise backing surface flow as ridgeline shifts east into the Lower Great Lakes/Upper Ohio Valley.
506 AM CST Tue Dec 19 2023 (Today through Wednesday Night) High pressure will control the weather pattern through the short term promoting calm and dry conditions.
536 AM CST Tue Dec 19 2023 (Today through Wednesday) Upper troughs moving into New England and the Pacific Northwest. Upper ridging moving out of the Rockies into the Plains States early this morning. At the surface, high pressure was centered over Arkansas. Today's highs probably won't get out of the 50s, but much of the area should be in the lower to middle 60s on Wednesday.
Tonight, an upper-level low will drop southward out of the Gulf of Alaska and becomes a cut-off low.
530 AM CST Tue Dec 19 2023 (Today and tonight) Southerly winds will increase this morning as the surface pressure gradient tightens between increasing lee troughing and high pressure to the east.
Canadian high pressure will build SE into our region through tonight then remain in place while gradually weakening/modifying for the rest the rest of the week, providing fair weather with moderating temperatures by late week. Dry cold front has pushed through and will introduce cold and very dry air into the region today. The center of Canadian high pressure to build into the southern Appalachians/W Carolinas tonight.
250 AM MST Tue Dec 19 2023 Upper ridge remain in place over the region. The ridge aloft weakens and we start to see mid level winds backing to the southwest. So we will add isolated PoPs (15-20%) for the high country starting early Wednesday.
951 AM EST Tue Dec 19 2023 High pressure will build across the area today and prevail through the rest of the week. Clear skies will prevail with dry and cold high pressure in place. Tonight: High pressure will prevail at the surface, with the center of the high pressure shifting further southward towards the Carolinas. As the center of high pressure moves closer to the forecast area the pressure gradient will weaken, yielding light winds. A large area of high pressure will settle over the eastern CONUS and become the dominant pattern through the short-term period. Aloft, the axis of a low amplitude ridge becomes aligned across the eastern U.
650 AM EST Tue Dec 19 2023 Cold high pressure will build into the region today and persist through mid week. Strong subsidence and cold advection in the wake of the exiting trough and tropopause dynamic anomaly will overspread the area today, resulting in sunny, but quite chilly conditions. Lows in the lower to mid 20s.
638 AM EST Tue Dec 19 2023 Dry high pressure builds across the region today and lingers into the weekend.
700 AM EST Tue Dec 19 2023 Cool high pressure builds in behind a departing cold departing front. High pressure then remains in control through the remainder of the week. A persistent nwrly breeze will keep temps above freezing for the barrier isls. Conditions will eventually moderate by late week with strong high pressure remaining over the region.
934 AM EST Tue Dec 19 2023 A weak cold front moves through this afternoon. High pressure then builds in through the middle of the week and will remain in control through the upcoming weekend. The mid and upper level trough axis pushes through later in the day. A NW wind will continue with a pressure gradient in place between the departing low well to the north, and high pressure to the southwest. Mainly clear skies are expected tonight with middle level ridging building in and the trough axis moving to the east. A high pressure ridge works in on Wednesday providing mainly clear skies. The winds will be lighter with temperatures remaining seasonable, mainly in the lower and middle 40s for maxes. A cold front approaches late Wed night and moves through in all likelihood by early Thu morning.
Until then, a strong ridge of warm high pressure will remain in control over the western and central states as an upper low drops south off the west coast.
344 PM EST Tue Dec 19 2023 Cold high pressure will build into the region today and persist through mid week. At the surface, ~1030 mb high pressure will build east from the TN Valley into the Appalachians tonight. NW winds have relaxed with the high shifting closer to the area, but a few locations are still gusting to 15-20 mph. This is resulting in a chilly afternoon as air temperatures are only in the lower-to-mid- 40s. Cold 1030 mb high pressure will remain anchored over central NC through the day/night, resulting in clear/calm winds most of the period. The low-level airmass will warm but after a cold start with teens and 20s, highs will still be below average in the upper 40s to around 50 degrees. Weak upper level ridge over the Mid-Atlantic region will influence fair weather late week.
339 PM EST Tue Dec 19 2023 Cool high pressure builds in behind a departing cold departing front. High pressure then remains in control through the remainder of the week. A cool, dry, and sunny day today in the wake of the cold front which passed through overnight. CAA has abated and the high pressure is building in from the west. Current forecast calls for lows in the low to mid 20s across much of mainland ENC, with high 30s along the OBX. Dry, cool, and quiet weather will continue Wednesday, with highs in the mid to upper 40s, similar to today but a few degrees warmer in spots. Conditions will eventually moderate by late week with strong high pressure remaining over the region.
/NEW/ /Through Wednesday/ Subtle elevated ridging continues to migrate from southwest to northeast across the Southern Plains, leading to a fairly quiet weather period through tomorrow.
1027 AM EST Tue Dec 19 2023 Snow showers will taper off today as high pressure begins to build across the region.
232 PM EST Tue Dec 19 2023 (This afternoon through Wednesday) High pressure will dominate the short term and bring continued dry conditions. With clear skies and near calm winds, another cold night is ahead tonight with subfreezing lows areawide. A gradual warming trend will begin on Wednesday as upper ridging starts to build eastward. Still, highs will remain a bit below normal but should nudge the lower 50s for most. While not quite as cold as tonight, subfreezing temperatures are again forecast areawide for Wednesday night lows.
The forecast remains on track this morning with high pressure in control, resulting in clear and cool conditions. These high clouds could result in slightly warmer temperatures today as the area may not be allowed to radiate efficiently. Mostly sunny skies will allow temperatures to rebound into the low/mid 50s today, but there is some uncertainty with tonight's lows as cirrus is expected to thicken up in the fast upper level westerlies laden with Pacific moisture, and this could keep lows above freezing.
Canadian high pressure will build SE into our region through tonight then remain in place while gradually weakening/modifying for the rest the rest of the week, providing fair weather with moderating temperatures by late week. This afternoon: High pressure continues to build into the region with a very dry air mass in place as dewpoints in the teens are common with PWAT values less than a quarter inch. Low temperatures this morning dropped into the mid 20s (24 McCormick, 25 Saluda) in the cold advection alone and think overnight lows tonight with strong radiational cooling should be in the lower 20s and upper teens in sheltered locations. Expect lows in the lower 20s and upper teens.
(This afternoon through Wednesday) High pressure will continue to move into the state through Wednesday. Winds should be a lot weaker with the pressure gradient off to the east, so wind chill values in the morning will be a few degrees cooler in the upper teens to mid 20s. As the high shifts east, flow will transition to the east by early Wednesday morning, and then east southeast by Wednesday afternoon. Otherwise, the southeasterly flow will bring slightly warmer air with high temps in the low to mid 50s on Wednesday.
Today the highs are around the mid 30s which is normal for this time of year.
PG (Today through Wednesday) Upper troughs moving into New England and the Pacific Northwest. Upper ridging moving out of the Rockies into the Plains States early this morning. At the surface, high pressure was centered over Arkansas. Today's highs probably won't get out of the 50s, but much of the area should be in the lower to middle 60s on Wednesday.
1010 AM EST Tue Dec 19 2023 A strong upper level trough will cross overhead today. High pressure will build into the area this evening, and remain in control through the end of the week.
1238 PM EST Tue Dec 19 2023 High pressure will build across the area today and prevail through the rest of the week. Clear skies will prevail with dry and cold high pressure in place. Tonight: High pressure will prevail at the surface, with the center of the high pressure shifting further southward towards the Carolinas. As the center of high pressure moves closer to the forecast area the pressure gradient will weaken, yielding light winds. A large area of high pressure will settle over the eastern CONUS and become the dominant pattern through the short-term period. Aloft, the axis of a low amplitude ridge becomes aligned across the eastern U.
1251 PM MST Tue Dec 19 2023 - Mostly quiet weather through this week, with dirty ridging and some light mountain snow showers. Dirty ridging will keep conditions warm and dry for most of the CWA.
At the surface, sswly winds and warm advection will prevail into Wed AM followed by a weak and dry cold front for Wed afternoon or evening.
259 PM CST Tue Dec 19 2023 - Breezy and warmer Wednesday - Wet for the end of the week and into the weekend Ridging will continue into Wednesday as the next weather system approaches the CWA. Southeast Kansas is likely to have the highest winds during the afternoon.
Over the weekend, we experience a reinvigoration of the upper ridge as high amplitude long wave troffing occurs over the West.
(This afternoon through Wednesday) The body of low pressure will continue to move northeastward, off the northeastern coast of the United States, as high pressure makes its way towards the southeastern U. The north-northwest wind flow will continue today, keeping the drier weather and cooler air across the region. Today's afternoon high temperatures will struggle to reach the low 70s across the metro and mid-to-upper 60s for the remainder of South Florida. Tonight's lows will be slightly warmer dropping into the upper 40s near Lake Okeechobee to low 60s in the metro. As the high pressure progresses further eastward into the southeastern US, it will initiate a moderate warming trend as the wind flow shifts northeasterly on Wednesday.
1119 AM CST Tue Dec 19 2023 Chilly and clear conditions are in place across the Mid-South this morning in the wake of strong high pressure at the surface and northwest flow aloft. Aside from a few high clouds moving in along an upper ridge, expect mostly sunny skies today with cool temperatures in the upper 40s. CAD Dry and cold weather is expected across the Mid-South today as high pressure moves across west Tennessee.
325 PM EST Tue Dec 19 2023 Below normal temperatures under dry high pressure will prevail across the area through the midweek period.
1158 AM CST Tue Dec 19 2023 (Today and tonight) An upper level ridge over Texas and the southern Plains will move east to the lower Mississippi Valley by this evening. Highs this afternoon will be in the lower to mid 60s. With this and an increase in surface dewpoints, temperatures will be warmer with overnight lows 47-50 degrees across the area.
(Tonight) High pressure will remain centered near the area, keeping cooler northeasterly flow in place. This will help keep temperatures a few degrees warmer than we saw last night, but still chilly as low drop into the mid to upper 20s.
Canadian high pressure will build SE into our region through tonight then remain in place while gradually weakening/modifying for the rest the rest of the week, providing fair weather with moderating temperatures by late week. Cold Canadian high pressure centered over the OH/TN Valleys continues to build into the area today. This morning low temperatures in the cold advection alone dropped into the mid 20s (24 McCormick, 25 Saluda) and think overnight lows tonight with strong radiational cooling should be in the lower 20s and possible upper teens in sheltered locations. Expect lows in the lower 20s and upper teens.
Highs Wednesday will be much warmer. Also for tonight, NBM low temperature guidance is still running a few degrees to high with the NAM/GFS blend much cooler and seems more reasonable with the low dew points, light winds and mostly clear skies.
This will keep temperatures climbing into the low to mid 50s each day through the rest of the work week.
1006 AM MST Tue Dec 19 2023 Current 500 mb analysis has a trough over Appalachia and a broad upper level ridge situated over the western 2/3 of the country, centered near the Continental Divide, allowing a west to slightly southwest flow over the area.
1234 PM EST Tue Dec 19 2023 A weak cold front moves through this afternoon. High pressure then builds in through the middle of the week and will remain in control through the upcoming weekend. The mid and upper level trough axis pushes through later in the day. NW wind will continue with a pressure gradient in place between the departing low well to the north, and high pressure to the southwest.
156 PM EST Tue Dec 19 2023 High pressure will build into the area this evening, and remain in control through the end of the week.
324 PM EST Tue Dec 19 2023 ===================================================================== Key Messages: - Chilly tonight but not as cold as last night - Low humidity levels tomorrow afternoon ===================================================================== High pressure centered over the central Appalachians will remain nearly stationary through tomorrow, keeping low and mid levels dry beneath high clouds streaming overhead. With the center of the high just off to our east, we'll have a slight southerly breeze tonight. The forecast calls for lows in the lower and middle 20s in most areas, and a bit colder in the usual valley cold spots. The south breeze will continue tomorrow behind the Appalachian high, and will bring warmer temperatures into the region with afternoon highs around 50. Though mixing heights will be low, very dry air in the low levels will lead to minimum afternoon relative humidity values around 25-30%.
400 PM EST Tue Dec 19 2023 High pressure building into our area will allow for dry conditions that will last through the rest of the week. For Wednesday, it'll be a quiet weather day with mostly clear skies, temperatures in the high-30s/low-40s, and calmer winds.
Winter Weather Advisory for eastern OR and the Lower Treasure Valley and Upper Weiser Valley has been extended to 11 AM MST as light freezing rain continues to fall this morning. After that it should decrease and temps should also warm above freezing, ending the hazard. Latest NAMNest shows more pcpn tonight and local freezing pcpn again in eastern OR, but not as much as today. Generally VFR conditions, with periods of LIFR/IFR conditions in low clouds/fog and a wintry mix of precipitation including freezing rain through 19/18z, then becoming mainly light rain showers during the afternoon.
Despite the abundant upper level moisture, the low and mid levels remain dry which region free of any precipitation tonight through Wednesday.
1225 PM EST Tue Dec 19 2023 Dry high pressure lingers over our region into the weekend.