Aikyam-Lab/Synoptic-Bench huggingface dataset:
657 PM MST Wed Dec 13 2017 Satellite showing a trough in the northwest flow aloft diving southeast over eastern Idaho and western Wyoming. The trough will continue to move southeast and lift ahead of the trough will spread over most of Colorado tonight. The lower levels of the airmass are still dry, so most of this is likely virga. The water vapor pictures show the upper trough pushing southeastward over eastern Idaho. Models show this trough to move across the CWA tonight.
With road surface temperatures above freezing and CAA aloft, not concerned with freezing rain impacts at this time. One particular area that may need re-evaluating is the higher terrain of southwestern North Dakota which will see the stronger winds and thus perhaps more travel impacts from falling/blowing snow.
1018 PM EST Wed Dec 13 2017 Weak high pressure builds in tonight and tomorrow while a weak disturbance moves by to our south.
An upper level trough set to the north will pivot through the area.
927 PM EST Wed Dec 13 2017 Rapidly moving low pressure will spread more snow over the region tonight. Nevertheless, advisory level snow (2-5 inches) is still projected along and north of the low center, which is progged to cross roughly along I 76 - north of previous projections related to objective analysis of pressure falls. Wind gusts on the higher ridges bear watching, as instability could partially mix down 40-50 knot winds just off the surface in tight isobar packing behind the low.
Otherwise, the low clouds are expected to stick around and bring the chance for light snow showers or flurries through the day tomorrow under deep cyclonic flow.
432 PM MST Wed Dec 13 2017 Current surface analysis shows low pressure over northern IL, with tight pressure gradient extending back to the west across much of the Dakotas and Central Plains. Upper level analysis shows high amplitude ridge remaining along the west coast, with a long wave trough over the eastern US. Clouds are increasing from the west-northwest with temps mostly in the 40s, some 30s across the higher Black Hills. A more active pattern is expected over the next several days as ridge gradually flattens over the western US and a series of disturbances pass through the region. A low pressure system will slide south-southeast across the Dakotas late tonight and Thursday, bringing increasing winds and some colder air.
A new ridge of high pressure will slide across the region Thursday and Thursday night with cold but mainly dry conditions.
May continue to see a bit of light flurries or perhaps very light drizzle or freezing drizzle in the Buffalo Ridge areas into the very early evening hours. However impacts are anticipated to be minimal if any as temperatures hold near or above freezing.
The combination of increasing clouds and greater boundary layer mixing will yield warmer low temps tonight, with most locations only falling into the l-m 30s. A cold front will be pushing south of the area early Thursday morning, leaving northwest flow across the TN Valley. Zonal flow will take hold of the upper level pattern, while high pressure builds at the surface.
930 PM EST Wed Dec 13 2017 Update Low pressure tracking near the southern Michigan border will bring heavy snow to parts of southern and central lower Michigan this evening before ending overnight.
North winds winds will be gusty this evening behind the low.
Gusty southwest winds will veer westerly and then northwesterly later tonight with the approach of an associated cold front. Much of the area has seen RH below 25%, but the 20 ft winds above 15 mph have been much more limited so far, and not coincident with the lowest RH. During the night, the clipper system's cold front will pass through. With a return to cold air advection, the low levels will moisten in the upslope flow once again, and low clouds should develop.
313 PM PST Wed Dec 13 2017 High pressure will keep skies mostly clear and high temperatures will remain above normal. Upper level high pressure will continue to dominate the weather regime across the region save a few weak disturbances from the north pushing through on the eastward periphery of the ridging.
High pressure will then build into the area for Thursday.
Light and variable or southwesterly winds tonight will turn to the northeast tomorrow as a dry cold front moves through the area. With these light winds and dry air mass, temperatures should drop into the low to mid 30s for all areas tonight. Would normally expect the low lying areas around I-10 to drop even more, but a veil of high clouds should keep temperatures from bottoming out like they did earlier today. Another weak cold front will move across the area Thursday morning, shifting winds around to the north. It will also bring slightly cooler temperatures to the area, although in reality it will only really bring us back down to around normal, with highs mainly in the upper 50s and lower 60s.
654 PM EST Wed Dec 13 2017 High pressure over the region will move south overnight.
Much of the area has seen RH below 25%, but the 20 ft winds above 15 mph have been much more limited so far, and not coincident with the lowest RH. During the night, the clipper system's cold front will pass through. With a return to cold air advection, the low levels will moisten in the upslope flow once again, and low clouds should develop.
/issued 335 PM CST Wed Dec 13 2017/ A dry cold front will continue to move across the Mid South from late this afternoon through late evening.
Meanwhile, a weak cold front extending from near the DFW Metroplex into SE OK/Wrn AR will slowly drift S into extreme NE TX/SW AR overnight, before seeping S across the remainder of the region Thursday. Cold front draped across srn OK will continue to slowly make its way through our region late tonight into Thursday morning, reinforcing the relatively cool airmass already in place.
As the aforementioned surface cyclone progresses eastward, the pressure gradient will continue to weaken. High temperatures look to range from the low to middle 40s.
/issued 314 PM CST Wed Dec 13 2017/ Upper level closed low continues to stagnate over the California Baja steering the southern jet and any moisture associated with it across south Texas while a vortmax on the east side of a sharply amplified ridge across the Pacific Northwest will move south across the Rockies over the next 24 hours.
632 PM EST Wed Dec 13 2017 High pressure over the region will move south overnight.
Ahead of the trough, extensive band of mid level clouds across NE UT and the N and Central areas of western CO have put a damper on temperatures today. Rapid post-trough drying expected on Thursday.
522 PM CST Wed Dec 13 2017 A dry cold front that swept into the region today will exit to the southeast this evening.
There remains much uncertainty concerning fog formation in the areas where the stratus has departed (most of southeast Oregon and much of the Lower Treasure Valley of Idaho).
600 PM CST Wed Dec 13 2017 A 992 mb low is centered near Milwaukee this afternoon and a cold front trailing from the low southwestward through roughly the I-55 corridor, pushing southeastward. Brisk winds were gusting up to 40 mph well ahead of the front, with a short lull in winds until behind the cold front where gusts to around 45 mph are prevalent, with the winds shifted to WNW. Overnight, winds will gradually decrease as a high pressure ridge approaches from the west. Winds will end up light WNW only around 5 mph during the day Thursday as a result of the ridge. Expect lows tonight back down to the low to mid 20s as cold post-frontal air moves back in from the northwest, with highs Thursday only in the low to mid 30s.
615 PM EST Wed Dec 13 2017 Low pressure will continue to lift north of the region tonight. A large area of Low pressure will remain to our north on Thursday as a weak low slides well to our south.
That's what makes this job so interesting! Tonight and Thursday will be dry with near normal temps as a weak dry cold front moves south across the CWA tonight.
508 PM EST Wed Dec 13 2017 Rapidly moving low pressure will spread more snow over the region tonight. The main event is still to come as strong, but rapidly moving low pressure will cross the region tonight, with snow resuming following an early eve break. Advisory level snow (2-5 inches) is still projected north of the low center, which is progged to cross ZZV as per rapidly falling surface pressure on the obs. Much of the ridge accumulation will occur after 06Z, with activity scattering out fairly rapidly after sunrise as mixing layers collapse. Keeping a 2-4 inch range in the ridges. Wind gusts on the higher ridges bear watching, as instability could partially mix down 40-50 knot winds just off the surface in tight isobar packing behind the low.
A cold front located just north of the Interstate 70 corridor will continue to push southeast and clear the region by the middle of this evening. The gusty winds will continue overnight behind the cold front then decrease around sunrise over the entire area as the trough moves away from the area and a ridge of high pressure moves over the region.
High pressure continues to settle into the region and will allow winds to stay light and variable overnight becoming light northerly through the day tomorrow.
1032 PM EST Wed Dec 13 2017 High pressure over the region will move south overnight.
635 PM CST Wed Dec 13 2017 Patches of light snow and flurries, and even freezing drizzle early this evening, will continue across the area overnight. Impacts for the next couple systems appear to be less as there is less wind and the threat for freezing rain is negligible.
Windy conditions will continue across central Indiana this evening and tonight along with low chances for measurable precipitation as a cold front moves through the area. Over the western counties, though, the column is getting closer to saturation and warmer temperatures and warm advection there are allowing precipitation (again, if it reaches the ground) to fall as rain. A strong low pressure system will provide forcing, but the best forcing will remain north of the area and the lack of moisture will make accumulation difficult. Winds are gusting at 22 to 39 kts across the area out of the southwest, and this will change over the next few hours as the cold front enters and sweeps through the area.
Persistent high pressure over the region will continue to result in well above average daytime temperatures and seasonably cool overnights through the weekend. Periods of breezy to locally gusty winds will remain possible along the ridges and peaks across the region. A strong mid/upper level ridge of high pressure over the West Coast continues to produce mainly clear weather conditions and unseasonably warm daytime temperatures. Closer to the surface, a tight pressure gradient has resulted in breezy to locally gusty offshore winds along the ridges and peaks. These winds will again pick up a bit during the overnight hours with some of the highest peaks seeing winds gusting up to around 40 MPH.
High pressure will keep skies mostly clear and high temperatures will remain above normal. Upper level high pressure will continue to dominate the weather regime across the region save a few weak disturbances from the north pushing through on the eastward periphery of the ridging.
The associated cold front is not very sharp, but winds will continue to veer to northwest through the evening while gradually diminishing.
Some degree of link-age will occur between the aforementioned waves overnight, resulting in a positively tilted trough that extends from the Desert SW northeast into the Central/ Northern Plains by 12Z Thu.
The 4 pm subjective surface analysis showed a complex frontal system associated with a 992 mb low over western Michigan, and a weak, flat ridge across the Gulf of Mexico. Vapor imagery and upper air data showed northwest, dry, sinking flow over our forecast area, on the southwest flank of a broad trough over the northeast quadrant of the CONUS. Weak low-level warm advection and increasing high-level moisture will prevent low temperatures from freezing, with lows generally in the upper 30s to lower 40s.
Wind shear was included at CSV until the low level jet decreases around 6z.
1016 PM EST Wed Dec 13 2017 Low pressure will continue to lift north of the region tonight. A large area of Low pressure will remain to our north on Thursday as a weak low slides well to our south.
The higher eastern mtn areas will probably end up seeing up to 6 or 7 inches of snow accumulation by Thu evening, with maybe 4-5 inches over the central mtns, and the southwest mtns should see less. In general, the lower elevations along the I-25 corridor and the high valleys should see an inch or two of snow, but the upper Arkansas River valley could see a little more. Temps will be cooler on Wed, with highs in the 30s over northern El Paso county and western Las Animas county, and in the lower to mid 40s over the rest of the southeast plains. The high valleys will mostly see highs in the 30s.
High pressure remains in place at the surface. For tonight, this high shifts eastward a bit, allowing low-level winds to become more southwesterly. Temperatures will bottom out in the 40s and 50s tomorrow morning, generally a few degrees warmer than this morning. High pressure over the area will shift eastward through Thursday night ahead of an approaching weak frontal boundary.
930 PM EST Wed Dec 13 2017 Very strong radiational cooling conds in place overnight as a sfc hi pres ridge pushes acrs south FL. while sfc/low lvl W/SW winds will diminish to less than 5mph as the ridge axis passes overhead. Radiational cooling will be strongest over the Treasure Coast/Lake-O region as the center of the ridge passes directly overhead, allowing winds to go calm. Temps slightly warmer to the north as a zonal jet streak over the srn tier states pulls a large cirrus shield acrs the GOMex and into the I-4 Corridor.
Upper level moisture beginning to stream into the the area at this time on a westerly flow with the breakdown of an associated upper ridge.
Colder air will filter into western Kansas tonight in wake of a cold frontal passage earlier today. Medium range models show ridging aloft breaking down as it moves out of the Intermountain West into the Central Plains early in the period.
/issued Issued by National Weather Service NEW ORLEANS LA/ SHORT TERM (Tonight through Thursday Night): Large expansive cirrus deck invading from the wests through the Lower Rio Grande Valley this afternoon with a tap well into the tropical Pacific.
More significant factor is the cold front headed toward the area that will bring some low level moisture will it, and will offer the potential for MVFR ceilings, especially north of KTYS.
Looking upstream, an approaching cold front had progressed to southern MO. Similar to the last cold front a few evenings ago, little to no cooldown was evident behind the front, with 40s temps extending into northern MO. /issued 335 PM CST Wed Dec 13 2017/ A dry cold front will continue to move across the Mid South from late this afternoon through late evening.
306 PM MST Wed Dec 13 2017 Current surface analysis shows low pressure over northern IL, with tight pressure gradient extending back to the west across much of the Dakotas and Central Plains. Upper level analysis shows high amplitude ridge remaining along the west coast, with a long wave trough over the eastern US. Clouds are increasing from the west-northwest with temps mostly in the 40s, some 30s across the higher Black Hills. A more active pattern is expected over the next several days as ridge gradually flattens over the western US and a series of disturbances pass through the region. A low pressure system will slide south-southeast across the Dakotas late tonight and Thursday, bringing increasing winds and some colder air.
Cold Front is getting closer and strato cu are already crossing into the northeastern areas. Chattanooga Airport, TN 32 49 29 44 / 0 0 0 10 Knoxville McGhee Tyson Airport, TN 31 44 27 41 / 0 0 0 10 Oak Ridge, TN 31 43 26 42 / 0 0 0 10 Tri Cities Airport, TN 31 39 23 39 / 0 10 0 10 TN.
610 PM CST Wed Dec 13 2017 Reports of freezing drizzle received across northeast SD along with some icy conditions. Weak lift along a frontal boundary draped across northeast SD will continue producing patchy freezing drizzle and light snow through this evening. The precipitation should mainly impact the higher terrain areas of the Sisseton Hills. The upper level flow pattern remains progressive through the extended with a number of troughs moving through the northern plains.
Snow will end across southwest Montana by tonight, with high pressure building aloft and skies clearing across the area for Thursday.
Windy conditions will continue across central Indiana this evening and tonight along with low chances for measurable precipitation as a cold front moves through the area. Surface analysis late this evening shows strong Low pressure was in place over Northwest Ohio.
542 PM CST Wed Dec 13 2017 Gusty northwesterly winds will continue to diminish across the region through the evening and overnight hours as the pressure gradient continues to relax behind this mornings cold front. despite the cooler airmass that has filtered in across the region. As the atmosphere begins to saturate down to the lower levels ahead of this disturbance.
Also upped winds a bit more along/near the Continental Divide with the upcoming Canadian cold front that will dropping through the region the next 24 hours.
823 PM PDT Mon Aug 7 2017 A weak trough near the California coast will maintain a dry southwest flow aloft this week.
950 PM EDT Mon Aug 7 2017 Update/Marine A weak cold front will bring isolated showers late this afternoon before skies gradually clear tonight as a drier airmass moves in. High pressure will bring fair weather with seasonable temperatures Tuesday through midweek. The most persistent activity was between Grand Rapids and Battle Creek thanks to favorable interaction between the cold front and outflow boundaries. A weak cold front will bring isolated showers along and ahead of it over roughly the southeastern half of our fcst area mid to late this afternoon.
714 PM CDT Mon Aug 7 2017 A quiet evening is shaping up for southern Wisconsin with high pressure located over the mid Missouri valley. High pressure will dominate this period. Core of the high slides to our south on Tuesday with a light westerly flow noted. Mid level ridging and the dry airmass prevails with some bump in 925 temps.
This front and assoc upper trof will sink slowly south and stall near I-20 with enough instability for mention of vcnty tstms with daytime htg for KSHV, KELD, KTXK, and possibly KLFK.
703 PM CDT Mon Aug 7 2017 At H5 strong closed low over the Aleutians. sharp ridge all the way into the Yukon. Quasi blocking pattern developing over the west coast. Quasi blocking pattern to the south of Greenland. These features are allowing a broad trough across the Northern CONUS. With energy coming underneath the upper low off the California coast across the central Rockies northeast Colorado and western Kansas will continue to see brunt of systems coming through with southwest Nebraska on the northern edge.
/issued 1058 PM CDT Mon Aug 7 2017/ Showers continue to move along a cold front that stretches from Clarksdale to Tupelo, Mississippi this evening.
928 PM EDT Mon Aug 7 2017 The cold front is moving into the Cumberland Plateau and southwest Virginia as an upper level trough dives southeastward out of the Great Lakes into the Ohio River Valley. The front is forecast to stall just to the south of the forecast area on Tuesday and could still see a few showers across the southern tier of counties or so and across the higher elevations. Chattanooga Airport, TN 72 83 70 84 / 60 50 20 30 Knoxville McGhee Tyson Airport, TN 70 81 66 83 / 70 20 10 20 Oak Ridge, TN 69 82 65 83 / 60 10 10 20 Tri Cities Airport, TN 65 79 62 82 / 70 10 10 20.
High pressure directly overhead this afternoon will sink to our southeast overnight, and across IA by daybreak Tuesday.
1033 PM MDT Mon Aug 7 2017 The cold front that plowed eastward across Sweetwater and Fremont County last night seems to be retreating back toward the north attm.
741 PM CDT Mon Aug 7 2017 Northwest flow prevails aloft, on the upwind side of a NE-SW oriented mid level trough axis (with an embedded MCV between Temple and Huntsville TX) from southern AR to the TX Gulf coast. Sinking motion in the mid levels on this side of the upper trough will maintain dry conditions tonight. A large and broad anticyclone was centered over the Midwest at the surface, which has helped keep temps well below seasonal averages, and has brought in some drier air. High pressure sagging into the region will keep winds light through the period.
The region of showers and isolated thunderstorms which have been slowly pushing south across the area are associated with a mid level trough axis. While this trough will only slowly move across Se Mi during the evening, instability is quickly on the wane with the loss of daytime heating. A broken line of showers and some thunder has developed across the Saginaw Valley and Thumb on the lead edge of the 500mb trough axis. This combined with clear skies and light winds will bring a rather unAugust like low in temps, mainly in the low 50s with many outlying sheltered areas dipping into the upper 40s.
Cold front with showers are well to our west and will be moving thorugh CWA Tuesday. TFJ Northeast Montana, situated between the persistent western ridge and the eastern trough, will maintain a dry northwest flow aloft tonight. At 00Z this evening there will be an approaching short- wave trough located over central Alberta. The delayed entry of cooler air into the area will result in highs similar to Monday's, which will continue slightly below normal.
However, confidence is is fairly high that MVFR/IFR cigs will redevelop mainly after 06z-08z with the highest confidence over the western zones, including KAMA and KDHT. Thunderstorms are not expected to make it off the higher terrain in New Mexico this evening, but a few isolated storms are possible Tuesday afternoon. As the main upper level high pressure system sets up across southern NM, these ridge rollers will move across CO and KS. However with northwesterly flow, additional rainfall with development across the high terrain in NM could reach as far south as Amarillo, including the chance of some thunderstorms toward the latter half of the week and instability increase. Going toward the weekend, some of the models are hinting at a small ridge building over the Rockies.
The front is south given the winds have shifted to the north and east and low pressure is most likely east of the region this hour. The ridges are mixing this hour leading to less confidence, but valleys could still see issues given earlier precipitation. An area of low pressure and frontal boundary remain nearby, but much of the heaviest rain has exited the region. Clouds will scatter out Tuesday afternoon, as a positively trough exits off to our southeast. High pressure will build in across the Ohio Valley Tuesday night, allowing for clearing skies, temperatures dipping down into the 50s, and areas of fog in the valleys.
1024 PM EDT Mon Aug 7 2017 A cold front will slip south into the area on Tuesday and stall. Should see overnight lows in the low to mid 70s. Showers and thunderstorms will continue to be a possibility through the short term period as the cold front moves into the area Tuesday morning, and stalls out somewhere across the south-central Midlands and CSRA.
830 PM PDT Mon Aug 7 2017 An upper level trough of low pressure will bring areas of night and morning low clouds and fog to the coast and some valleys through next Monday. A weak but persistent trough over California will maintain a very quiet and mostly unchanging weather pattern the next several days.
Cold front is currently located across the mid state this afternoon. In the ext fcst, the broad troughing pattern over the eastern U.