Aikyam-Lab/Synoptic-Bench huggingface dataset:
/issued 415 AM CDT Thu Apr 9 2020/ A surface cold front is currently draped across North Mississippi from Marvel, Oxford, Corinth and extending northeast through Middle Tennessee. Drier and cooler weather is expected today and Friday as a cooler air mass moves into the area from the north. Friday will be much cooler as high pressure builds into the region.
(Today and tonight) The cold front that passed through our area is currently south of the Red River, though overnight temperatures have been slow to cool. Cooler temperatures, in the 50's, have settled into portions of northern and western OK.
Temperatures have trended slightly cooler as well, but most locations should still see highs in the U60s/L70s.
A low pressure system will bring cooler temperatures and chances for rain and high country snow showers this morning. Expect a downturn in activity with shower chances continuing in the western zones on Thursday and Friday as the low moves northeastward. Slight chance for precipitation will continue through the weekend with warmer temperatures. Expect the low to continue a northeastward wobble through the day today before retrograding southward back over the coast of southern California. Showers will continue across northwestern Coconino and Yavapai Counties near the low through the afternoon with only light accumulations expected.
658 AM EDT Thu Apr 9 2020 A cold front will sweep across the state this morning, then an anomalous upper level trough will swing over the northeast conus tonight and Friday. The upper trough will lift out and high pressure will build along the east coast this weekend.
A low pressure system is passing though southern NV today.
But, even mesoscale models do not bring any showers further south later in the afternoon, so have left "silent" inherited POPs for those areas, despite the increase in moisture ahead of the cold front moving through the Florida panhandle this afternoon. Low ceilings will be possible again overnight ahead of an approaching cold front that will move through central Florida Friday morning. Winds are expected to increase again to 15-20 kts overnight ahead of an approaching cold front, especially across offshore waters. A cold front will move across the area on Friday, accompanied by increasing rain chances and perhaps a storm or two.
721 AM EDT Thu Apr 9 2020 A cold front will sweep across the state this morning, then an anomalous upper level trough will swing over the northeast conus tonight and Friday. The upper trough will lift out and high pressure will build along the east coast this weekend.
Strong Gusty Winds and Cooler Temperatures Today. A tight pressure gradient will result in strong NW winds today with gusts up to 30-35 mph likely as cooler air spreads across the region. Decreasing 1000-850 hPa thickness values suggest max temps today will only reach into the mid to upper 50s for most, with Louisville and southern KY slipping into the low 60s. Continued CAA will result in Friday morning mins in the low 30s. Deep 500 hPa low should be just east of Maine by Friday morning with the upper trough axis just to our east. Highs on Friday will likely only reach the low-mid 50s.
Cold front currently pushing through the mid state this morning. Otw, clearing and cooler conditions are on the way for today. High temps will top out in the lower to mid 60s with a moderate nw breeze. Friday will be even cooler as 850 mb temps barely reach 0C in the afternoon.
323 AM MDT Thu Apr 9 2020 Dry weather will prevail over the area today into Friday with high pressure over the region. High temperatures will range from around 60 degrees in the west to the lower 40s near the Dakotas border today. Downslope conditions out ahead of an approaching cold front on Friday will allow temperatures to warm into the 60s for many places.
637 AM CDT Thu Apr 9 2020 Early morning GOES-16 water vapor imagery showing a closed low over Ontario with troughing extending southward through the Upper Midwest/Upper Mississippi River Valley. Embedded and vigorous mid- level trough embedded within this flow was moving southeast from Manitoba into northern MN. That aforementioned vigorous mid-level trough will rotate across the area today. Showers are expected to diminish this evening along with skies clearing as cold Canadian high pressure builds in. Dry and colder than normal Friday/Friday night as high pressure drifts east across the area. West/northwest flow aloft ushers in a cold front from the Northern Plains for a chance of rain showers. Otherwise, warm air advection ahead of the cold front should push highs into the 50s.
533 AM EDT Thu Apr 9 2020 A cold front will sweep across the state this morning, then an anomalous upper level trough will swing over the northeast conus tonight and Friday. The upper trough will lift out and high pressure will build along the east coast this weekend.
Early this morning, colder air continues to flow into central Indiana behind an exiting cold front. There looks to be enough forcing for some slight chance to chance category PoPs most areas this afternoon, with the highest PoPs northeast closer to better forcing. The bottom of the mixing layer should produce gusts near 40 mph, with the highest gusts across the northern half of the area. Sunshine today should boost temperatures to a little warmer than the NBM for highs. The upper trough will still be providing enough forcing for some low PoPs in the early to middle evening. Temperatures will get to freezing across the northern forecast area with just above freezing south. High pressure will provide dry conditions Friday and Friday night.
418 AM MDT Thu Apr 9 2020 An upper level low is currently centered west of Las Vegas NV, and ahead of this system a lot of high cloud cover has moved over southern CO. Forecast sounding still show the potential for some low stratus over portions of southeast CO this morning, but as of 09Z the low levels are still relatively dry along the I-25 corridor, and a little more moist toward the eastern border areas. The forecast models show little movement of the upper low through the day.
Into tonight, a cold front will sweep east to west across the region with additional showers possible. /issued 409 AM CDT Thu Apr 9 2020/ Upper level flow will become increasingly southwesterly today as an closed low remains nearly stationary over the Panamint Range of southern California. The precipitation should wrap up this afternoon followed by a back door cold front entering the region from the NE this evening and overnight. Friday the upper level ridge overhead will slowly begin to shift east as a Pacific upper level low makes a slow progression eastward.
922 AM EDT Thu Apr 9 2020 High pressure across the southern peninsula this morning and a cold front approaching from the north will keep a breezy westerly wind flow across the entire forecast area the remainder of today with warm and muggy conditions expected. It will be another very warm day with temperatures climbing into the lower 80s along the coast, and mid to upper 80s inland. A cold front approaching later tonight into Friday will bring additional MVFR/IFR Cigs to the terminals after 06Z tonight. High pressure to the south will maintain west winds in the 10 to 15 knot range with seas of 2 to 3 feet over the Gulf waters the remainder of today.
This feature is rotating around the main upper low centered over Ontario, and will help push a reinforcing cold front through the area today. Overall the latter portion of the forecast still looks to be cooler than normal with an upper trough remaining across eastern North America.
639 AM CDT Thu Apr 9 2020 The upper low that has been off the coast of California has made its way over southern California. Meanwhile a deep and elongated trough will continue to slowly rotate southeast out of Canada through the Upper Mississippi Valley and Great Lakes Regions. The northern deep trough will force the California low to remain quasi-stationary through at least tomorrow night before beginning its pilgrimage east into the desert southwest.
303 AM PDT Thu Apr 9 2020 A low pressure system will remained stalled over southern California into Friday with periods of showers and a slight chance of thunderstorms for Friday afternoon.
/Issued 351 AM CDT Thu Apr 9 2020/ Today will see a return to more seasonable temperatures following the passage of a cold front overnight. A light freeze will be possible tonight in the more sheltered valleys of northeast Oklahoma and northwest Arkansas, but most places will remain above freezing. The highest rain chances will remain across southern and eastern parts of the forecast area, but most rainfall amounts are expected to remain rather modest.
A large low pressure system will linger over the region today and tonight before slowly moving into Southeast California on Friday. High pressure will build into California this weekend for much warmer and drier weather. Very cool and wet weather continues over most of the forecast area this morning as the deep cut off low pressure center meanders over Kern County. High resolution models bring the heavy precipitation over Kern County to an end by 8 AM as the flow around the low pressure center moves the rain and snow to the southeast.
High pressure will fill in tonight which will bring some colder morning lows for Friday. Friday should prove to a be a mild day as high pressure shifts southeast and southerly flow develops.
415 AM CDT Thu Apr 9 2020 A surface cold front is currently draped across North Mississippi from Marvel, Oxford, Corinth and extending northeast through Middle Tennessee. Drier and cooler weather is expected today and Friday as a cooler air mass moves into the area from the north. Friday will be much cooler as high pressure builds into the region.
715 AM EDT Thu Apr 9 2020 Windy and much cooler conditions are expected today.
502 AM MDT Thu Apr 9 2020 Northern stream influence will grow in the period as a massive western NOAM ridge supports anomalously cold long trajectory longitudinal flow in center NOAM. Currently, backside departing impulse will support another round of pressure rises across the region behind a secondary trough, which will progress dry locally. Cold front will advance into the region Friday night, with falling temps into Sat. However, as the sw CONUS upper trough begins to shift east and phase, lift will increase across the region, maximizing Sat night as the upper jet left exit region times over the FA, supporting a strong FGEN band given expected steep ll lapse rates which happen to be centered in the DGZ.
The rest of the valleys of western Montana will see highs toping out in the low to mid 60s. Valleys in north- central Idaho will see temperatures in the upper 60s and low 70s, with the lowest valleys around Riggins reaching the upper 70s.
631 AM CDT Thu Apr 9 2020 (Today and tonight) The cold front that passed through our area is currently south of the Red River, though overnight temperatures have been slow to cool. Cooler temperatures, in the 50's, have settled into portions of northern and western OK.
Under the low, cool weather will continue with a chance for showers and a slight chance of thunderstorms today.
409 AM CDT Thu Apr 9 2020 Upper level flow will become increasingly southwesterly today as an closed low remains nearly stationary over the Panamint Range of southern California. The precipitation should wrap up this afternoon followed by a back door cold front entering the region from the NE this evening and overnight. Friday the upper level ridge overhead will slowly begin to shift east as a Pacific upper level low makes a slow progression eastward.
The winds will diminish mid to late evening, allowing temperatures to quickly cool tonight to lows in the low to mid 30s.
1146 AM MDT Thu Apr 9 2020 An upper level low is currently centered west of Las Vegas NV, and ahead of this system a lot of high cloud cover has moved over southern CO. Forecast sounding still show the potential for some low stratus over portions of southeast CO this morning, but as of 09Z the low levels are still relatively dry along the I-25 corridor, and a little more moist toward the eastern border areas. The forecast models show little movement of the upper low through the day.
This will come to an end early tonight and lows will fall to near freezing.
216 PM EDT Thu Apr 9 2020 Upper level low pressure will provide showers through tonight, with mix with or change to snow tonight. Some light accumulation is expected in the ridges.
225 PM CDT Thu Apr 9 2020 Water vapor satellite early this afternoon shows a potent short wave trough moving across the Upper Midwest. This activity is expected to dissipate rather quickly very late this afternoon into the early evening as the short wave trough moves past the area allowing the forcing/lift to diminish. After that, the clouds should also dissipate rather quickly leaving behind mostly clear skies as an area of high pressure moves from the west. While the center of the high will slip south of the area Friday, the northern extent of the ridge axis will slide across the area.
125 PM EDT Thu Apr 9 2020 Windy and much cooler conditions are expected today.
1225 PM CDT Thu Apr 9 2020 Early morning GOES-16 water vapor imagery showing a closed low over Ontario with troughing extending southward through the Upper Midwest/Upper Mississippi River Valley. Embedded and vigorous mid- level trough embedded within this flow was moving southeast from Manitoba into northern MN. That aforementioned vigorous mid-level trough will rotate across the area today. Showers are expected to diminish this evening along with skies clearing as cold Canadian high pressure builds in. Dry and colder than normal Friday/Friday night as high pressure drifts east across the area. West/northwest flow aloft ushers in a cold front from the Northern Plains for a chance of rain showers. Otherwise, warm air advection ahead of the cold front should push highs into the 50s.
1217 PM CDT Thu Apr 9 2020 (Today and tonight) The cold front that passed through our area is currently south of the Red River, though overnight temperatures have been slow to cool. Cooler temperatures, in the 50's, have settled into portions of northern and western OK.
325 PM CDT Thu Apr 9 2020 Scattered snow/graupel showers associated with the main upper low over Ontario will gradually come to an end from west/northwest to east/southeast this evening. As the surface pressure gradient relaxes behind the departing cold front, surface winds will also gradually diminish below 10 knots overnight and clouds will clear. On Friday the trough shifts east of the area and we see south/southwest winds return. Therefore we should see a notably warmer day with highs in the upper 40s to mid 50s, albeit still cooler than normal for early April.
309 PM EDT Thu Apr 9 2020 Water vapor imagery shows an impressive and large upper level low complex descending southeast from Canada and into the Great Lakes Region. To its south deep layer ridging remains in place for the southeast US. Upstream of this ridge is the next upper level low that is slowly churning eastward across California and Nevada. At the surface, a weak high pressure is retreating southeast in advance of a cold front moving through the Lower Mississippi River Valley. Visible satellite shows hardly a cloud over the entire Florida Keys as deep layer ridging is severely restricting moisture. Meanwhile, dew points in the lower 70s is making it a muggy afternoon.
/Today through Friday/ Cold front currently along a line from Hot Springs to Idabel to Durant will continue to ease south and east across the ArkLaTex today. High pressure building behind the front to bring cooler temperatures with highs in the 70s areawide this afternoon. Scattered showers and thunderstorms to increase in coverage across southeast Texas today ahead of a 700mb upper trough. Dry conditions expected on Friday as surface and upper-ridge build across the region.
These showers will become more focused over northern portions Friday night, as a weak initial cold front moves through this area.
This activity will come to an end by this evening as upper level ridging is established across the area, with a quiet night in store. Slightly cooler air will advect into the region from the northeast tonight as high pressure settles into the Central Plains.
As dry weather prevails through Friday night, about the only concern is the potential for frost and/or freezing temperatures both tonight and Friday night. Continue to monitor the potential for temperatures to approach the freezing mark along Interstate 64 late tonight, but at this point it looks as though we should stay just above that threshold. While readings should stay above the freezing mark Friday night, areas of frost are possible across eastern portions of southwest Indiana and the Kentucky Pennyrile, where winds remain light and clouds are slower to increase.
Temperatures are near 80 across the Lower Keys, while temperatures have risen into the lower to mid 80s in the Middle and Upper Keys. Dew points are once again in the lower 70s. This is in response to an approaching front that is currently trekking across the Lower Mississippi River Valley. Winds will increase late this afternoon across the Upper Keys and adjacent waters as a thermal trough over the mainland induces a tighter pressure gradient in this area.
304 PM CDT Thu Apr 9 2020 Drier and cooler weather will prevail through the end of the week.
Upper level map analysis shows a nearly flat flow aloft over the southeast US, south of a broad upper trof over the Great Lakes. At the surface, a cold front has moved to a position from the Mid-Atlantic, draped across the southeast US then west into central TX. A majority of the weather tonight though will become increasingly elevated on the cooler, north side of the front. Drier conditions expected Friday afternoon into Friday night associated with high pressure building east over the Mid-South to the lower Appalachians. Overnight lows in the mid to upper 50s, trend cooler Friday night from 42 to 47, mostly north of the beaches.
High pressure over the region today will continue to provide warm mild conditions to the area all under clear skies and with light winds.
/issued 548 AM CDT Thu Apr 9 2020/ A cold front moving across the region will bring VCTS conditions across LFK after 09/18Z. /Today through Friday/ Cold front currently along a line from Hot Springs to Idabel to Durant will continue to ease south and east across the ArkLaTex today. High pressure building behind the front to bring cooler temperatures with highs in the 70s areawide this afternoon. Scattered showers and thunderstorms to increase in coverage across southeast Texas today ahead of a 700mb upper trough. Dry conditions expected on Friday as surface and upper-ridge build across the region.
Western Kansas is under the influence of a 850 mb height trough and the wind field is becoming increasingly light and easterly near the surface. A surface anticyclone centers over east central Kansas by around 12 z Friday, at the same time a weak 700 mb impulse is moving through the upper ridging along the CO/KS line. Cold air in the northeast, where radiational cooling should let Hays get down to freezing, whereas the far southwest should be kept above freezing either in the upper 30s or low 40s - there is a wider range of forecast outcomes out west.
337 PM EDT Thu Apr 9 2020 Upper level low pressure will provide showers through tonight, with a mix with or change to snow through the evening. Some light accumulation is expected in the ridges.
303 PM CDT Thu Apr 9 2020 Today's forecast concerns focus on temperatures, as they will be jumping up and down over the next 4 days, with Freezing warning needed at times and some precipitable weather over the weekend. However, this will also result in good radiational cooling overnight, which will allow widespread sub- freezing temperatures by Friday morning.
228 PM CDT Thu Apr 9 2020 Have an upper ridge over the area with a cut off low over Srn CA/Srn NV.
219 PM CDT Thu Apr 9 2020 The Northern Plains are sandwiched between cyclonic and anticyclonic flow regimes this afternoon, with a closed low circulation over eastern Ontario and upper level ridge axis extending from northwest Montana into northern Saskatchewan. 18Z surface analysis shows high pressure sitting over western North Dakota/eastern Montana. Despite the lack of clouds farther west, the boundary layer has had a hard time mixing today, leaving temperatures in the lower to mid 30s thus far. By Friday afternoon, the attendant cold front will be pushing into northern North Dakota. The cold front will continue to move south across the state Friday night, accompanied by chances for rain changing over to snow as surface air temperatures cool.
Under cool northwest flow, temperatures tonight will tumble into the low to mid 30s. For Friday, expect another cool and sunny day with highs reaching into the low to mid 50s. Canadian high pressure overhead on Friday night will allow temps to drop to around freezing, especially east of Interstate 65 where skies will stay clear the longest. Upper trof digs into the Land of Enchantment Sat night, with deepening SW flow ahead of it.
Friday, a backdoor cold front will drop south across eastern Montana and will be signaled by a wind switch to the north and an increase in clouds.
Light winds and mostly clear skies will allow for prime radiational cooling conditions with lows expected to fall to below freezing across the northern half of the forecast area. The closed upper low over the Desert Southwest is expected to weaken and become more of an open wave as it moves into the southern Plains Sun. At the same time, an unseasonably deep/broad upper trough will dig across the Great Basin in the Plains.
Cooler. Another cold front will push south, across West Central Texas, tonight and bring winds from the north and cooler temperatures. Lows tonight and highs tomorrow will therefore be cooler than those of previous days. Rain and Another Cold Front.
Dry and cold air continues to push in behind the cold front. Northwest flow provides orographic lift for some light showers to continue over the high terrain over the next few hours. Gusty westerly winds continue this afternoon behind the cold front and turn more northwesterly overnight, but remain gusty. Chattanooga Airport, TN 42 59 38 68 52 / 0 0 0 10 80 Knoxville McGhee Tyson Airport, TN 40 56 36 66 49 / 0 0 0 10 60 Oak Ridge, TN 38 56 36 66 49 / 0 0 0 10 60 Tri Cities Airport, TN 35 52 32 62 44 / 10 10 0 10 40.
Should see a nice recovery in temperatures on Friday as return flow draws warmer air into the region.
In terms of the GFS trend, it has slowly been strengthening the core of the low slated to pass through the area.
Strong subsidence and isentropic downglide are underway with a high pressure settling into South Dakota. Winds taper around sunset as the boundary layer decouples and the center of the high approaches the forecast area. High pressure drops south through Nebraska and into Kansas by daybreak. Very strong warm air advection takes place in western Nebraska, aided both by an advancing warm front and H85 thermal ridge. Assuming fairly deep mixing to around H7, this should translate to highs in the lower 70s.
An upper ridge continues to build into the Pacific Northwest, allowing for above- normal temperatures, mostly clear skies, and light winds.
1109 AM MDT Thu Apr 9 2020 Northern stream influence will grow in the period as a massive western NOAM ridge supports anomalously cold long trajectory longitudinal flow in center NOAM. Currently, backside departing impulse will support another round of pressure rises across the region behind a secondary trough, which will progress dry locally. Cold front will advance into the region Friday night, with falling temps into Sat. However, as the sw CONUS upper trough begins to shift east and phase, lift will increase across the region, maximizing Sat night as the upper jet left exit region times over the FA, supporting a strong FGEN band given expected steep ll lapse rates which happen to be centered in the DGZ.