Aikyam-Lab/Synoptic-Bench huggingface dataset:
This system will push a weak cold front (currently near OKC-SGF-COU line) into the Mid-South later today. The second system is the low-amplitude wave moving through the Desert Southwest and extreme northwest Mexico. The cold front is forecast to settle over the CWA by early afternoon, stalling somewhere along the I-40 corridor, before pushing south through the area overnight. Dry weather is anticipated today with temperatures warming into the lower 80s south of the cold front. We will see increasing cloud cover this afternoon and evening as the southwest trough approaches, supplying mid and upper-level moisture in addition to broad forcing for ascent. This will lead to some light rain showers after midnight north of I-40, with precipitation chances gradually shifting south and washing out later Tuesday morning as the cold front accelerates.
Mean upper level troughing will dominate the period, supporting below normal temps with unsettled and breezy conds. Splitting upper trough supporting a round of PVA this afternoon, with steep lapse rates allowing convective rain/snow showers. Closed low over the Northern Plains/Upper Midwest, will support another arm of PVA into the area Monday, with another round of sct snow showers in the afternoon. Cool, breezy, and increasingly unsettled weather can be expected the remainder of the week, with a late week storm possibly affecting a portion of the FA as the western NOAM upper trough moves east. Too much uncertainty remains in storm evolution (given a closed upper trough) to be able to confidently forecast any snow amounts at this time. Local MVFR CIGS are expected over northeast WY into the higher Black Hills tonight.
A dry northwesterly flow aloft continues across the north central Gulf Coast region this evening in the wake of an upper level trough that is pushing eastward across the eastern CONUS. An upper level low pressure system will continue to lift toward the Mid-Atlantic region Monday and Monday night, while the associated trough axis also shifts into the western Atlantic.
133 AM EDT Mon Apr 12 2021 Low pressure will track east through the Lower Great Lakes and keep some form of scattered shower activity in the Ohio Valley through early Monday, then end from southwest to northeast during the day. A weak ridge of high pressure will then lay out from the Plains towards Kentucky through mid week, bringing dry weather.
Weak zonal to slightly NW flow aloft dominates as an upper level low over the northern plains spins away with a slow eastward drift. 30 To start the forecast period, an upper low will be slowly dipping southeastward across the Great Lakes region.
An upper low over Ohio this morning will begin to shift ESE through Pennsylvania and off the eastern seaboard today and tonight, with weak upper ridging building across the forecast area in its wake. Surface pressure gradients won't really tighten much across the area, but low level winds will increase during the afternoon as the upper low transits the Appalachian chain. Highs should be similar to yesterday in the north (upper 60s to around 70), but rising heights and H85 temps should be enough to push afternoon temps up 4-6 degrees warmer than yesterday in the central and southern TN valley (mid 70s to near 80).
A cold front has cleared all of our NE OK and far NW AR TAF sites at the time of writing with very little in the way of cloud cover being observed along the front. Expect this trend to continue for most sites that get behind the cold front. Clouds will also increase as well thanks to the the aforementioned cold front getting hung up across SE OK. The cold front has pushed into northeast OK over the past 1-2 hours and will continue south overnight before stalling in the terrain of southeast OK/northwest AR late tonight.
127 AM EDT Mon Apr 12 2021 [Through 06Z Tuesday] Weak cold front currently south of Albany to near Bainbridge to Apalachicola and is the demarcation between drier air on northwest winds to the west and low cigs with patchy fog to the east. The cold front traverses the area this evening. Patchy fog develops overnight with lows in the lower to middle 50s. As high pressure slides eastward, we can expect southerly flow to start filtering in warm moist air back into the region ahead of Wednesdays' frontal passage. With weak upper level ridging/zonal flow in place we can expect it to be mostly dry through the afternoon.
129 AM EDT Mon Apr 12 2021 Periodic shower chances will continue through mid week with crossing upper level lows.
Tonight as an area of high pressure moves in the wind should be light and with mainly clear skies overnight lows should fall back into the 30s.
322 AM EDT Mon Apr 12 2021 Synopsis/Discussion/Marine - Isolated to scattered showers and colder this week -- Isolated to scattered showers and colder this week -- The slow moving upper low that meandered it's way from the southern Plains is over western Lake Erie this morning. This upper low will move east today and be replaced by another upper low that's moving across the northern tier of states.
the big picture starts out with an active multi-low flow across the north and flattening pattern developing across south with perhaps some ridging across southern Texas. regional pressure will fall on Tuesday ahead of the the western us trough.
High pressure begins to build into the region tonight and should see winds drop off significantly around the 00z timeframe. CD Chattanooga Airport, TN 80 53 76 54 71 / 0 0 20 10 40 Knoxville McGhee Tyson Airport, TN 76 51 72 51 67 / 0 0 20 10 40 Oak Ridge, TN 76 50 72 51 66 / 0 0 20 20 40 Tri Cities Airport, TN 71 46 69 47 64 / 0 0 20 20 40.
Today through Tuesday: The upper-level pattern will consist of broad closed low becoming centered over the western Great Lakes. Several waves of energy are expected to rotate around the low and through northeast Wisconsin over the next 48 hours.
Light southwesterly winds will continue until just before daybreak, when a cold front will move into the region. After today, the warmer temps will take a backseat for much of the region as a cold front rolls south through the Panhandle, bisecting the northern half of the area by tomorrow morning. Monday night into Tuesday is when the real cold push occurs as the Canadian high pressure over the Rockies drills an anomalously cool airmass into the southern high plains.
Afternoon highs, however, will be a few degrees warmer than today, but still around 5 degrees below normal. An upper low is still expected to develop to our north on Monday and move southward over our area on Tuesday.
Otherwise, we expect a cold front to roll through the Big Country this morning. Temperatures will be much cooler across the Big Country. Otherwise, expect winds to shift to a northerly direction as a cold front pass through the region today.
Weak high pressure will temporarily develop across the area late Monday before an upper level low brings unsettled weather for the midweek period. Utah remains under a cool west-northwesterly flow aloft this evening as the trough that pushed the cold front into the area last night is now moving across the northern Great Plains. While this trough will result in no more than some high clouds over northern Utah tomorrow, it will maintain the airmass in place with temperatures changing little from today.
A transition to cooler weather occurs Tuesday onward.
1158 PM CDT Sun Apr 11 2021 A low pressure system is hovering over the Great Lakes and Northern Plains. There is a cold front associated with a short wave on the back side of this system that is moving through Kansas. Highlight: Cooler The cooler air will arrive to start to the work/school week with daytime highs falling roughly 10 to 15 degrees from today. High temperatures on Monday are still forecast to be in the low to mid 60s which is right about seasonal normal.
1154 PM EDT Sun Apr 11 2021 Scattered to numerous light showers will rotate west-northwest into the area around low pressure and persist overnight, especially KPTK north. Forecast soundings suggest a good proxy for greater precipitation probs will be in the area of cooler 600mb cold air advection rates. Interesting transition of the upper level low height anomaly across the northern tier of the contiguous U. Now, Southeast Michigan is showing more of a ridging component overhead with closed low over Cleveland area and another nosing across southern Lower Michigan.
1130 PM CDT Sun Apr 11 2021 Low clouds and light precipitation persist this afternoon as latest in series of closed upper lows gradually shifts off to the east. Slow-moving upper low will dominate the weather through Tuesday, resulting in a continued cloudy, cool and wet pattern to start the week. With lows near freezing in some areas Monday night and the recent warm spell and quick green-up, will mention patchy frost where needed. Weak ridging moves overhead and generally weak flow persists from midweek on, as the upper low drifts eastward into the Ohio Valley.
1151 PM CDT Sun Apr 11 2021 A cold front passing through the area today is bringing cooler and drier air in behind it which will remain in place over the next couple of days. Behind the front, a closed upper level low, currently centered over Saskatchewan/ North Dakota border, will head southeastward during the day tomorrow, bringing breezy conditions over the Sandhills once again. As the low passes, can expect the northwest winds to pick up more into the day. The humidity will be the lowest across southwest Neb with values near 18-20%, and highest across north central Neb near 20-25%.
It typically requires heavier snowfall rates to overcome warmer ground temperatures, which will likely happen in several rounds, so anticipate slushy accumulations followed by some melting. Winds appear gusty and could limit visibility at times, but given warmer temperatures it would require much stronger winds to really increase blowing snow impacts to something significant (so, blowing snow should not be much of a concern).
943 PM PDT Sun Apr 11 2021 Cooling will intensify Monday and Tuesday in response to a low pressure system developing over the northern Great Basin.
102 AM EDT Mon Apr 12 2021 A cold front will cross the area late tonight.
A light northwest flow behind the frontal boundary will prevail as high pressure builds across the northern Gulf coast, and temperatures will warm into the low to mid 80s across the interior this afternoon, with upper 70s to around 80 at the beaches. Weak high pressure will build over the area tonight, leading to clear skies and light winds. Excellent radiational cooling will allow temperatures to fall 25-30 degrees from daytime highs in the low to mid 50s across the interior. For the beaches, temperatures will be warmer in the upper 50s to lower 60s.
136 AM EDT Mon Apr 12 2021 High pressure remains over our region through Monday, leading to drier conditions.
A closed and slowly progressive upper low is expected to form over the Great Lakes, with another cut-off like low developing over the west central part of the CONUS. However, that pattern won't last long as the western trof starts to shear out and send energy east into the Plains.
257 AM EDT Mon Apr 12 2021 A showery and seasonably cooler early-spring weather pattern will plague central Pennsylvania this week. Expect shower coverage to ramp up today as a closed upper low moves over the Commonwealth. Highs trend anywhere from 5 to 15 degrees cooler than yesterday generally ranging in the mid 50s to low 60s. Loss of diurnal heating combined with increasing subsidence and ridging aloft behind departing closed low should result in decreasing coverage of showers tonight.
High pressure promoting benign weather across the Tennessee Valley region with dry conditions and a clear sky in place. Upper level height rises will occur on Monday as the ridge to the west pushes further east. Additionally, on Monday another upper level closed low will move into the northern Plains and western Great Lakes. A frontal boundary will move southeastward across the central and southern Plains in advance of this upper level closed low. This upper level low slowly drifts eastward on Tuesday with the front slowly progressing to the south and east. Temperatures will be slightly cooler on Tuesday thanks to the increased cloud cover with highs in the mid 70s.
High pressure currently present over the state will continue to push east overnight into the early morning hours on Monday. High pressure will slowly move to the east through period with southerly flow returning for the most of the terminals. Today Through Tuesday Surface ridging was centered across LA this afternoon with clear and seasonable conditions prevailing across the region. Through tomorrow morning, tranquil conditions will persist as surface ridging slides east. By Tuesday, slightly cooler air will work into northern portions of the state where highs will only reach the upper 50s to low 60s.
329 AM EDT Mon Apr 12 2021 Mostly cloudy skies and a few showers will persist today in the moist flow behind low pressure. High pressure is forecast to bring dry weather to most of the area on Tuesday, though isolated showers associated with a weak disturbance may affect southern locations.
A return Srly low level flow should result in a weak cu field returning N by mid to late afternoon across the Wrn sections of E TX, which should thicken and gradually lower to MVFR by/after 06Z Tuesday across these areas near and behind a weak cold front, which will become stationary shortly after 12Z today over extreme N TX/SE OK/Wrn AR, before drifting back SE across E TX/SW AR later tonight. Departing high pressure will keep light southerly winds going in East Texas overnight, although elsewhere the boundary layer will likely decouple and make for light and variable winds and more efficient radiational cooling.
305 AM EDT Mon Apr 12 2021 Scattered showers are expected today with crossing low pressure. A closed mid/upper level low is expected to track across the Upper Ohio Valley region today. Increasing layer moisture and ascent in the vicinity of the low should result in scattered showers developing this morning. Shower coverage should wane tonight as the low tracks to the Mid Atlantic coast, and temperatures fall below convective thresholds.
A late Monday night/early Tuesday morning cold frontal passage will then bring our 3 day warming trend to an end, ushering in the southern periphery of a continental polar airmass.
1127 PM EDT Sun Apr 11 2021 Periodic shower chances will continue through mid week with crossing upper level lows.
147 AM EDT Mon Apr 12 2021 (06Z TAFs) With the cold front still back to the west, conditions continue to support occasional showers, most favorably in the VCTY of southern terminals.
High pressure will slide through the Mississippi delta southeastward to the northeast Gulf coast through the day today into tonight. Aloft, weak ridging will take hold as the upper trough moves off the Atlantic coast and an upstream trough moves into western Texas. No rainfall is expected in the near term with highs today reaching the low to mid 80s and lows tonight falling into the mid 50s.
A negatively tilted trough is in the process of closing off into an H5 low this morning. High temperatures will top out in the lower to middle 30s from the Red River Valley westward, with middle to upper 30s to the east. Most of the forecast area is expected to fall below freezing by 00Z or shortly thereafter. Snow is expected to continue, with our best chances for accumulations expected during this time as surface temperatures fall below freezing.
At the surface, high pressure over the northeast Gulf, will turn our winds to a more southerly direction today, but displacing the dry air in place will take some time. Despite the weak low level moisture return, mid and high level moisture will begin spilling over the ridge this afternoon mainly in the form of cirrus.
123 AM EDT Mon Apr 12 2021 Persistent upper level low pressure provides chances for showers through Monday.
1051 PM CDT Sun Apr 11 2021 (This evening through Monday) A cold front will move northwest to southeast across Oklahoma this afternoon and evening.
123 AM EDT Mon Apr 12 2021 [Through 06Z Tuesday] A cold front was pushing through the area, and will push south of the TAF sites by 09Z. Showers and thunderstorms will continue to taper off this afternoon/evening from northwest to southeast across the area as a cold front approaches. The cold front will move south of the area late tonight with dry conditions expected behind the front as high pressure builds in from the west. Broad high pressure will build in behind the cold front Monday into Tuesday. High pressure will be relatively weak, which will result in light winds both days. High temperatures will be above average in the low-to-mid 80s on Monday and in the mid-to-upper 80s on Tuesday. Slightly cooler temperatures are expected at the coasts where highs will be near 80.
In the upper levels, ridging will nose into the area tonight into Monday. Latest GEFS and ECMWF ENS indicate the highest probabilities of greater than 0. Cooler 60s return starting Tuesday. At the surface there will be a reinforcing shot of dry high pressure air, providing cool northerly breezes and mostly clear skies. However, as the "trofiness" tends to be replaced by northwesterly flow aloft, surface pressures should be on the rise on Sun, which will tend to mean improving conditions.
453 AM EDT Mon Apr 12 2021 Fair and dry weather expected early this week with above normal temperatures with high pressure and northwesterly flow over the region. Chances of rain increase Wed/Thu as an upper trough dives southeast from the Great Lakes into the Mid-Atlantic region and pushes a cold front through our area. Slightly cooler temperatures are expected late in the week into the weekend. Upper disturbance moving through our region early this morning, with an upper low moving SE through the Mid Atlantic today and tonight, will lead to a dry NW flow aloft for our region.
400 AM CDT Mon Apr 12 2021 A cold frontal boundary crossed our region yesterday and we've entered a cooler weather pattern which will last for several days. Aloft, an upper trough encompassed much of the Central and Northern Plains states and energy within the trough is forecast to split. leading to a couple of closed lows across the CONUS this week. Today, the center of the upper low reaches Minnesota with general west to northwest flow aloft across our area. Temps will be several degrees cooler than what we saw over the weekend in the post frontal airmass and highs are forecast to range from 55-60F (north/south). Tuesday's weather remains dry, and we see the upper trough split into a couple of closed lows with one oriented in the Great Basin area and the other in the Upper Midwest.
323 AM EDT Mon Apr 12 2021 High pressure remains over our region through today, leading to drier conditions.
Dry conditions are forecast to persist through today as a weak mid level ridge builds east into the Mississippi Valley. An upper low over the Northern Plains and Upper Midwest will slowly shift east into the Great Lakes through mid week. Earlier forecasts had largely anticipated the flow south of the low into the forecast area to be dry through mid week. However, models have trended wetter, especially tonight into early Tuesday morning, as weak energy streaming through the zonal flow south of the low provides enough forcing for the development of light rain showers.
1023 AM EDT Mon Apr 12 2021 A showery and seasonably cooler early-spring weather pattern will plague central Pennsylvania this week. Earlier change of trending maxT lower owing to slightly more progressive upper low movement into PA this afternoon and adding low prob thunder as a result. Scattered shower coverage at mid morning will ramp up by afternoon as the closed upper low moves over the Commonwealth. Highs 5 to 15 degrees cooler than yesterday generally ranging in the mid 50s to low 60s. Loss of diurnal heating combined with increasing subsidence and ridging aloft behind departing closed low should result in decreasing coverage of showers tonight.
530 AM EDT Mon Apr 12 2021 Scattered showers are expected today with crossing low pressure. A closed mid/upper level low is expected to track across the Upper Ohio Valley region today. Increasing layer moisture and ascent in the vicinity of the low should result in scattered showers developing this morning. Shower coverage should wane tonight as the low tracks to the Mid Atlantic coast, and temperatures fall below convective thresholds.
A cold frontal boundary crossed our region yesterday and we've entered a cooler weather pattern which will last for several days. Aloft, an upper trough encompassed much of the Central and Northern Plains states and energy within the trough is forecast to split. leading to a couple of closed lows across the CONUS this week. Today, the center of the upper low reaches Minnesota with general west to northwest flow aloft across our area. Temps will be several degrees cooler than what we saw over the weekend in the post frontal airmass and highs are forecast to range from 55-60F (north/south). Tuesday's weather remains dry, and we see the upper trough split into a couple of closed lows with one oriented in the Great Basin area and the other in the Upper Midwest.
An upper low currently centered over NO OH will result in scattered showers as it slowly transitions across the forecast area. Shower coverage will wane tonight as the upper low tracks exits to the east.
CD Chattanooga Airport, TN 82 53 79 54 73 / 0 0 10 10 30 Knoxville McGhee Tyson Airport, TN 77 50 72 52 71 / 0 0 20 20 30 Oak Ridge, TN 77 49 72 51 70 / 0 0 20 20 30 Tri Cities Airport, TN 72 46 70 48 68 / 0 0 20 10 40.
Mostly clear skies prevail across the Medford forecast area this morning, with gusty northeast winds over the ridges.
500 AM CDT Mon Apr 12 2021 A weak and dry cold front extending from near IRK southwest to just west of COU will move southeastward through our forecast area today. Will only see slightly cooler high temperatures today across northeast and central MO. Slightly cooler high temperatures can be expected on Tuesday, a tad below normal.
High pressure over the region will maintain dry weather this week, with mild days and cool nights.
432 AM MDT Mon Apr 12 2021 Upper low will linger over the northern plains for a few days. With the colder air being pulled southward around the low, most of the precipitation will occur as snow, with accumulations possible in the heavier bands. Another low begins to form over the Great Basin with ridge pushing into western Canada. Warmer air will be drawn north along with Gulf moisture. Precipitation in Montana will be dependent on the position of the upper low, but could reach into southern Montana.
1024 AM EDT Mon Apr 12 2021 A showery and seasonably cooler early-spring weather pattern will plague central Pennsylvania this week. Maintained earlier trend of lower maxT owing to slightly more progressive upper low movement into PA this afternoon and adding low prob thunder as a result. Scattered shower coverage at mid morning will ramp up by afternoon as the closed upper low moves over the Commonwealth. Highs 5 to 15 degrees cooler than yesterday generally ranging in the mid 50s to low 60s. Loss of diurnal heating combined with increasing subsidence and ridging aloft behind departing closed low should result in decreasing coverage of showers tonight.
214 AM PDT Mon Apr 12 2021 Cooling will intensify today and Tuesday as low pressure develops over the Great Basin.
A mainly sunny and warmer day is ahead as we sit under high pressure. The low pressure center that tracked to our north and created gusty winds yesterday had moved well away from our area, so winds will be much lighter today.