Aikyam-Lab/Synoptic-Bench huggingface dataset:
Scattered flurries/low clouds were along a weak cold frontal push this evening heading southward with mostly clear skies in behind. The cold front that brought light snow to much of the region today has shifted to our far southeastern counties, and will be quickly to our east shortly after 00Z. An elongated area of high pressure set up across western Canada will build a ridge into the forecast area through Saturday. 850mb temps will fall to around -15C for the day Saturday, with highs about 3-6C cooler than today. The first one will arrive on Sunday and sweep a cold front through the area. Behind the cold front, high pressure will build over North Dakota and northeast South Dakota and much colder air will be ushered into the area.
/issued 249 PM CST Fri Dec 22 2017/ What a difference a day makes! Temperatures this afternoon are over 20 to 30 degrees cooler than this time yesterday across portions of the area due to a cold front that's moving through the region. Any precipitation will gradually diminish by this evening as the upper trough lifts toward the Central Plains, with clearing skies expected to yield a very cold night tonight. Lows overnight will range from the lower 20s north and across the higher terrain to the upper 30s through portions of the Rio Grande Valley. The next cold front is expected Sunday, with good agreement among guidance for the front to edge into northern portions of the area by mid-morning, and then progress to the Rio Grande by early evening.
435 AM EST Sat Dec 23 2017 The mean layer ridge which was across the Yucatan at this time yesterday, has moved east and is nearly atop the Florida Keys. Breezes are a little weaker and backed to the east-northeast across the cooler shelf waters north of the island chain. Temperatures are in the lower 70s with dewpoints in the upper 60s. The mean layer ridge will flatten and denigrate today through Sunday night as lower heights sweep through the southeastern United States and northern Florida. Meanwhile, the cold front currently over the Mississippi River Valley will undergo frontolysis as it moves southeast into northern Florida.
Weak high pressure will move across NM tonight with light winds and seasonably cold temperatures. A backdoor cold front will move across the eastern plains early Sunday morning, and highs Sunday will be 5 to 10 degrees below normal east of the central mountains and slightly above normal to the west.
Given the high snow ratios, would not be surprised to see a 4" amount somewhere in southeast NE or southwest IA south of I-80. The cold front was moving into northeast Nebraska with temperatures in the 20s/30s and dewpoints in the 20s ahead of it and temperatures in the teens and dewpoints in the single digits and teens behind it. The RAP/HRRR are trending toward cooler temperatures compared to the blend.
333 AM CST Sat Dec 23 2017 Colder air is settling into the area on the heels of a cold front that passed through the forecast area during the afternoon and evening hours. A broad upper level trough over the area will send another surge of cold air in our direction tonight, accompanied by a band of cold air advection and frontogenesis driven snow showers from this afternoon through this evening. The clouds overnight have kept our temperatures from dropping off, but they will not recover much today either as even though we should see decreasing cloud cover for at least this morning, the approaching cold front will just bring them back again this afternoon and I expect greater cloud cover for tonight and Saturday.
While areas of north-central Idaho will see 2 to 5 inches with isolated higher amounts, especially for the higher terrain.
321 AM CST Sat Dec 23 2017 Zonal flow will persist through the next 24 hours before a passing trough to our north shifts the flow regime a bit more northwesterly on Sunday morning.
MVFR cigs will remain in place behind the cold front through the evening.
300 AM MST Sat Dec 23 2017 Current surface analysis shows cold front well south and west of the forecast area, with weak high pressure centered over northern SD. Upper level analysis shows long wave trough remaining across much of Canada and the northern US, with low centered over southern Hudson Bay.
256 AM CST Sat Dec 23 2017 Latest 08z surface analysis shows weak cold front extending from southern Ontario Canada into northern Iowa. Metars in southeast Minnesota and western Wisconsin are reporting flurries and low stratus clouds in associated with the cold front. First piece of energy rotates around the upper level trough into the Central Plains Sunday.
Expect fair weather with warming temperatures through the holiday weekend as high pressure builds along the west coast. High pressure was located off the California coast with troughing from the Rocky Mountains eastward this morning.
1128 PM CST Fri Dec 22 2017 The cold front has cleared KGLS leaving scattered showers and low ceilings in its wake. Breezy NW winds are expected in the wake of the front, with the gustiness hanging around about as long as the low ceilings. /ISSUED 633 PM CST Fri Dec 22 2017/ Cold front is sweeping through Southeast Texas, with a temperature gradient of up to 30 degrees across the front. /ISSUED 249 PM CST Fri Dec 22 2017/ A cold front as of 2 pm was through College Station and Crockett.
Poor flying weather will continue across the region as a low pressure system tracks along a cold front, bringing a period of moderate to heavy showers late tonight and Saturday morning.
1114 PM CST Fri Dec 22 2017 On the large-scale, water vapor showing a digging trough of low pressure across eastern New Mexico and western Texas this afternoon, with ample mid/upper-level moisture advection occurring downstream across the Southern Plains and lower Mississippi Vly. Meanwhile, regional radar imagery shows a swath of precipitation extending from eastern Texas northeast through the lower Ohio Vly, with the far northern fringes of these returns creeping up towards our southern CWA border. The one thing that does look a little different than yesterday is a slight northward shift in max QPF placement, with today's runs favoring the highest amounts along and north of the Route 36 corridor. The only exception continues to be the NAM which shows the higher axis further south between Route 36 and I-70.
18z surface data has weak low pressure across central Indiana and a weak high from the upper Great Lakes into the central Plains. Broad troffiness will be in place across the eastern two thirds of the country through the period.
Good collab with LSX/SGF/ILX yields perhaps a dusting in our northwest counties this morning, 1/2 inch ish or less with surface and ground temps above freezing so we're mainly grassy/sheltered locations.
Warm front moving up into the area Sunday morning. /ISSUED 332 PM CST Fri Dec 1 2017/ At 2 PM, high pressure over the eastern U. continues to retreat east and an area of low pressure was nearly stationary over the Texas panhandle. High cloudiness will increase Saturday night and a weak warm front will slowly approach the coast.
251 AM MST Sat Dec 2 2017 Upper level analysis has near zonal flow across the CONUS with very weak ridging across the northern Plains and a trof just off the coast of the Pacific Northwest. At the surface, high pressure resides across the central Plains, with a weak trof across central Montana into eastern Wyoming. Weak ridging will slowly shift east this weekend as the Pac NW trof moves onshore tonight. West to southwest boundary layer flow ahead of this trof will continue to advect warm air into the region, with above average highs today and Sunday, in the 50s and lower 60s.
Cloudy skies will remain in place across the area through Saturday as weak low pressure slowly moves through the region.
Warm front approaches from the southwest on Saturday as temperatures should warm nicely into the mid 50s with relatively light wind. Warm front will have moved to the northeast Saturday night and most locations should remain above freezing, except for perhaps far north/west. Long-awaited pattern shift will begin taking place by Sunday as amplification of flow occurs and an amplified ridge reaching up to the Gulf of Alaska occurs. A corresponding trough will develop over the west coast and create more southwest flow over our area Sunday. Our current forecast is for highs near 60 to lower 60s for Sunday, but if we do not get much sun, this could be five to ten degrees cooler. Also, wind ahead of the approaching cold front may increase Sunday, and make it feel cooler as well.
zonal flow aloft at present time will amplify just a tad Saturday ahead of an approaching upper trough which will approach the area Sunday night. Low temperatures tonight in the low to mid 20s which is a few degrees above normal. High temperatures Sunday generally in the low 60s to near 70.
This will result in a weak surface trof moving east across central Kansas to along the turnpike corridor by dawn. A modest increase in low level moisture ahead of the trof will occur and may help promote patchy fog where winds become light near the surface boundary early Saturday morning. Otherwise, daytime highs will warm from the lower to the upper 60s over the weekend.
Areas of fog are starting to form away from the stratus shield over eastern portions of the CWA, while visibility has so far remained good farther west across most locations underneath the low stratus deck.
More snowy weather is expected Saturday night into Sunday as a strong low pressure area moves into the area.
Saturday looks fantastic with highs a few degrees warmer into the low to mid 60s. Upper level ridging moves in on Sunday and highs will reach the upper 60s with increasing southerly winds.
Looks like a nice weekend as surface ridging controls much of the eastern United States. Temperatures will approach 60 both afternoons and will bottom out around freezing Sunday morning.
An upper trough will swing across central WI overnight.
1100 PM CST Fri Dec 1 2017 Tonight through Saturday: High pressure will track from northwestern Nebraska into western Kansas overnight. On Saturday, high pressure will build east into northeastern Kansas and southeastern Nebraska. Southerly winds will develop on the back side of the high, ushering in slightly warmer air to the forecast area compared to today.
Signs point to phasing these two jets as early as Sun as very strong jet stream and upper level trough crash ashore the western Conus. Normal highs for early Dec are in the low 30s. Into tonight, high pressure over Ohio Valley ridges toward Upper Great Lakes. Upper air pattern consists of a 500 mb trough in the Pacific NW 00z Sun with a trough in the desert sw. These troughs combine and move into the Rockies and northern plains 00z Tue.
Upper level flow becomes more amplified by tonight, with ridging building out of the central US.
At the surface, high pressure sits over southwestern SD. Zonal flow will become more ridge-like this weekend as a trough pushes into the Pacific Northwest. Southwesterly low-level flow ahead of the next trough will advect warm air into the region, with above average highs Saturday and Sunday in the 50s and lower 60s. On Sunday night, the upper trough will cross the Rockies, and a strong cold front will push into the northern plains. The region will be under strong northwest flow for the rest of the week, as the upper trough digs into the eastern CONUS and a high- amplitude ridge builds over the west. The ECMWF tries to bring in some warmer air toward the end of the week, but the GFS keeps it cold.
20Z water vapor imagery showed zonal flow over the central plains while an upper low remained off the Baja of California coast and an upper trough approached the Pacific Northwest. However the higher dewpoints remain across central TX and the Big Bend of the Rio Grand. For high temps on Saturday, mixing is expected to be limited by weak ridging passing through. With the assistance of the enhanced mixing and warmer air aloft, Sunday is still on track to be the warmest day of the period with highs in the upper 60s.
1255 AM EST Sat Dec 2 2017 High pressure will drift east of the area tonight but should remain in control of our weather Saturday.
Over the next 24 hours or so the low pressure system supporting this band of clouds will head eastward leading to a bit more sunshine on Saturday. A low pressure system and associated cold front will begin to move across the western states. Otherwise, slightly cooler under thickening high level clouds.
102 AM EST Sat Dec 2 2017 High pressure through the weekend.
The front will wash out to our south on Saturday in deference to a deepening lee trough over the High Plains. In the low levels, the lee trough will remain anchored over the High Plains while a cold front materializes over the north- central U.
Temperatures today have run slightly cooler than expected, likely thanks to the enhanced cloud cover. Saturday, highs will again be mild, running around 10 degrees warmer than average. Winds will increase during afternoon ahead of an approaching cold front on Sunday. Stronger winds and increasing cloud cover should keep overnight lows mild and a bit warmer than the past few days heading into Sunday.
/issued 411 PM CST Fri Dec 1 2017/ Under sunny skies today temps climbed into the low to mid 70s acrs the region. high pressure will exit off to the northeast with light southerly winds becoming established late in the day. Tmrw highs will be a tad bit warmer as the warming trend is expected to continue. A cold front will also begin to move out of the Rockies.
/Issued 218 PM CST Fri Dec 1 2017/ Mid level SW flow continue to advect mid to high clouds northeast into our region ahead of a mid level low pressure system off the Baja California coastline. As that system become more of open wave and move southeast, the streamline of clouds will also sink south clearing out most of the region by Saturday in-conjunction with a weak cold front moving south through the region before clouds return to parts of the southern TX Panhandle by Sunday as south to south-southeast wind flow returns. Temperatures will drop briefly behind the cold front with highs in the mid to upper 60s before rising to well above average in the SW flow on Sunday with highs in the lower to mid 70s.
Surface ridging will shift gradually east of the region overnight, leading to SSW winds Saturday with speeds mainly less than 10 knots. Thicker clouds around for Saturday as the 700 MB thermal trough works through, still plenty dry enough down low not to worry about any precipitation chances.
1030 PM CST Fri Dec 1 2017 Continued VFR with light SW winds, veering NW around daybreak behind a decaying cold front. /issued 256 PM CST Fri Dec 1 2017/ Winds have shifted to the southwest today as surface lee troughing developed. The downsloping warming component of the wind will allow temperatures to warm quickly this weekend, and highs will be in the low 70s which is about 10 degrees above normal. The closed low over Baja will open up as it moves east and will move through as a wave Sunday evening.
1110 PM EST Fri Dec 1 2017 High pressure will build across the region tonight and Saturday.
Models are in fair agreement with this overall pattern so have hedged toward the lower consensus on temperatures. A deep-layer ridge will be in place on Sunday, keeping conditions dry and temperatures above normal. A good chunk of the forecast area may have afternoon highs in the lower 70s.
Will see increasing mid and high clouds as weak cold front approaches from the northwest and moisture advects in ahead of it. Continued strengthening of the low level south-southwesterly flow on Sunday night will result in mild temps with lows warmer than typical highs for early December.
234 AM EST Sat Dec 2 2017 A weakening area of high pressure will remain across the region through today.
Some guidance still points to fog/low stratus potential near a slow moving front and associated surface cyclone, primarily over west-central and southwest parts of Oklahoma late tonight. The cold front has entered northwest Oklahoma this evening and is slightly faster than the previous forecast. Some fog is still possible immediately ahead of the cold front, where there is some moisture pooling. West-central into southwest Oklahoma and western north Texas may have the greatest chance of fog with the higher dew points located in this area.
341 AM CST Sat Dec 2 2017 Upper pattern has a flat ridge stretching across the country with a cut off low over Baja. By Sunday this low will move east and weaken opening up into a trough as it moves into NM/TX. At the same time another trough will move ashore the NW coast.
Dry air increases in the low/mid levels Saturday which should help suppress shower development so will not mention showers in the forecast.
1146 PM CST Fri Dec 1 2017 A weak upper-level disturbance is approaching the area this evening from the west in the zonal flow regime over the lower 48 states. Meanwhile, at the surface, weak southerly flow is in place across the forecast area on the back side of a departing area of high pressure. These clouds and the southerly low-level flow should keep overnight lows several degrees warmer than last night. High pressure sitting over the Ohio River valley will move east this evening and bring a return to southerly winds into tomorrow.
208 AM EST Sat Dec 2 2017 High pressure through the weekend.
303 AM CST Sat Dec 2 2017 A short wave trof passing through the area in the Midnight to 6 AM window of time early today is bringing mid and high clouds to the area, and an increase in south winds.
Some slight visibility restrictions are possible toward morning, mainly southeast of Waco where the high clouds will remain scattered and low level moisture will be the most abundant. The wind direction will become slightly more southwesterly during the day Saturday ahead of a weak cold front, but no significant wind shift is anticipated. The resulting increase in dewpoints combined with thickening high clouds will keep temperatures a little warmer tonight, with lows remaining in the 50s.
1135 PM CST Fri Dec 1 2017 At 3 PM, a cold front was located over western Minnesota. Temperatures ahead of this cold front ranged from the mid 40s to mid 50s. 5C cooler on Saturday, there will be more sunshine.
Temperatures will trend warmer on Sunday, especially across northeast Indiana and northwest Ohio where highs will reach the mid to upper 70s.
High pressure will slowly move towards the east coast through the short term. mainly along the higher elevations. The cloud cover should help keep temperatures a degree or two cooler than today. but mainly along the higher elevations.
Upper low was still over the 4 corners region with strong diffluent flow across the southern and central plains. Dewpoints south of the front were in the low 70s. Surface based CAPES have surged into the 2500-3000 j/kg range as dewpoints have increased from the low 60s to low 70s on the south side of the front. The upper low should shift from the 4 corners region into central KS by mid morning Sunday with the dry slot beginning to edge into the western CWA. With the large amplified ridge in place over the eastern U.
233 PM EDT Sat Apr 29 2017 A weak front moves through the area this afternoon through early this evening, with high pressure briefly returning for Sunday.
344 PM CDT Sat Apr 29 2017 Midday water vapor imagery captured a twin-lobed upper cyclone across NM, and a modest warm conveyor belt of clouds and light rain from the northern Panhandle south to the western Permian Basin. As the upper low tracks from near Ft Sumner, NM to Perryton, TX by daybreak Sunday, mid-level drying will envelop more of the South Plains and Rolling Plains behind the current axis of light rain. Farther NW near the upper low and deformation zone, precipitation should prove more definitive in both time and space. Northwest gradient flow will sharpen considerably by Sun morning as the upper low deepens about 130 meters in 9 hours. By Sunday evening, the upper low responsible for this weekends cool- down should be positioned near the Kansas City Metro area leaving NW flow aloft West Texas.
Northern stream trough axis sliding slowly across Montana today and is generating some convection over the central sections of the state.
1107 AM MDT Sat Apr 29 2017 Upper level analysis has large trof across the western CONUS with closed lows over the four corners area and across south central Canada. At the surface, high pressure was located across the Dakotas.
348 PM MDT Sat Apr 29 2017 An upper-level low pressure system continues to drift slowly south and east through the southern Rockies this Saturday afternoon. Freeze warning has been issued for the Delta- Montrose corridor where confidence is high in sub-freezing temperatures for several hours overnight. By Sunday night, a weak disturbance will round the eastern side of a ridge of high pressure centered over the west coast.
The upper low over New Mexico will move slowly east into the southern Rockies by this evening. Strong high pressure aloft will finally reach the area around the middle of the week.
behind an upper low tracking north of the terminals. At least one additional zone of -RA will precede this low today, mainly affecting LBB and PVW after 2 PM, but VIS restrictions are unlikely.
SHORT TERM (Tonight through Sunday Night): Strong, dusty, gusty winds will subside by this evening as high pressure behind an approaching cold front fills in the daytime low pressure depression over West Texas. Mdt south southeast winds will continue overnight, however, pretty much until they shift to northwest with the arrival of the cold front.
High pressure will be East Northeast of the region through Sunday. There will be a little better chance for inland convective initiation Sunday afternoon as the approach of an upper trough provides additional source for instability.
) This upper system is predicted to lift across NRN TX/SRN Plains during the period, with the corresponding cold front moving across the CWA overnight then offshore after 06z Sunday (GFS/NAM deterministic. Cooler Sunday night with lows in the 50s over much of the CWA.
1212 PM CDT Sat Apr 29 2017 Multiple rounds of showers and thunderstorms will continue today and tonight as a deep upper level low lifts northeast from the southern Rockies and interacts with a stalled front across the region. The highest amounts will generally fall along and south of Interstate 44 with lower amounts farther north across central Missouri. Ample instability will be in place or develop across far southern Missouri as the warm front lifts north a bit. The severe risk will ultimately depend on the northward extent of the warm front. The upper low will make its way into the region Sunday allowing rain to taper off but not entirely end.
347 PM EDT Sat Apr 29 2017 A cold front will cross the area this afternoon followed by high pressure on Sunday.
457 PM EDT Sat Apr 29 2017 High pressure ridging into the forecast area from the Atlantic will dominate through Sunday and help keep any thunderstorms mainly associated with heating isolated.
134 PM EDT Sat Apr 29 2017 A warm front will continue to move north approaching southern Michigan by Sunday causing showers and afternoon scattered thunderstorms in our area. Cool temperatures tonight will warm considerably Sunday behind the warm front. A cold front will sweep across the area Sunday night causing showers and possibly thunderstorms.
1200 PM MDT Sat Apr 29 2017 Imagery shows longwave trof across the CONUS with closed low in base of trof centered over the 4 corners. Strong 120 to 160 kt jet associated with the LW trof stretches from the west coast down through the Desert SW. SFC has a cold front well south of the region across the srn Rockies/srn Plains with high P building into/across the nrn tier of states including WY. Weal inverted trofs extending from swrn CO into scntrl/cntrl WY and another through UT and into sern ID. Upper closed low continues to slip s/se along with the cold front, moisture return and associated precipitation. These general conditions will last well into Sunday before an upstream sw trof rides through the nw flow aloft and into wrn WY with late afternoon/evening showers breaking out west of the Divide.