Aikyam-Lab/Synoptic-Bench huggingface dataset:
1046 PM MDT Fri Sep 29 2017 Latest upper analysis showed a high amplitude ridge over plains states and provinces with an upper low over Wyoming. A the surface, high pressure was centered over Lake Superior with a N-S oriented low pressure trough over the western CONUS. A persistent area of cloud cover over parts nern WY and far wrn SD has kept temps slightly cooler than forecast this afternoon. Early Saturday, the upper low will wash out in response to the deepening upper trough over the western CONUS. Low pressure developing over southern BC will draw warm air northward as a warm front crossing the forecast area. Southwesterly flow aloft will promote warm air advection/thermal ridge over the CWA with readings well into the 70s.
High pressure, light winds and clear skies will dominate the region on Saturday. High pressure, light winds and clear skies will dominate the region on Saturday. Medium Cumulus field fairly widespread with mid level cyclonic flow and low level thermal trough. Combo of low level thermal trough and increasingly favorable trajectory could lead to period of lake induced cloud cover hanging on for a time. Lingering tighter pressure gradient between departed low pressure and high pressure building in from the Plains will result in the winds staying up for a time overnight. The high shifts off to the east pretty quick on Saturday so influence of low level thermal trough wanes as return flow starts to take shape. Mid level ridging translates across WI as well.
Drier air works into the region tomorrow as surface anticyclone arrives from the western Great Lakes. With increased downward vertical motion, daytime cumulus clouds may mix out during the afternoon owing to a clear afternoon and evening especially away from the higher terrain.
The Arctic high pressure will move overhead tonight with ambient temperatures expected to dive into the single digits/teens below zero. The Arctic high begins to slide east on Friday as a weak mid-level trough from the Northern Plains interacts with a warm front pushing north out of the Central Plains. The weak mid-level trough pushes east across the area Friday evening for a continued chance of light snow.
Winds will shift to the south to southeast tonight then south to southwest tomorrow as a dome of high pressure slides east of the forecast area. As for temperatures, lows tonight will fall to around 20 degrees with highs tomorrow ranging from the low 40s across southern Nebraska to low 50s across eastern Colorado and Kansas.
A cold front approaching from the northwest will be located roughly on a line from Tifton, GA SWWD to Panama City by daybreak.
At upper levels, ridge will remain entrenched off the West Coast. Given the location of the upper level ridge, there will be varying amounts of high-level clouds drifting overhead with the sky conditions wavering between mostly clear and partly cloudy.
A 500 mb trough remains over the area this forecast period with cold air and a prolonged lake effect snow event. In the extended, GFS and ECMWF show a broad 500 mb trough 12z Sun with cold air. This trough and cold air remains through Thu with a prolonged lake effect snow event and below normal temperatures for this forecast period. Gale warnings and heavy freezing spray warnings are up across Lk Superior. Heavy freezing spray will continue through Friday night.
254 PM CST Thu Feb 1 2018 Over the next 6-10 days, the overall synoptic pattern will feature a mid-level ridge just off the U. Pacific coast with a Hudson Bay low and associated trough over the eastern half of the United States. During this time, at least two cold fronts will move across Oklahoma and western north Texas.
/issued 418 AM CST Thu Feb 1 2018/ Surface analysis early this morning places a cold front from Southeast Missouri back through Northwest Arkansas and into Southeast Oklahoma. A cold front is expected to move across the Mid-South today. Cooler and drier conditions are expected across the forecast area for Friday as a ridge of high pressure returns to the Lower Mississippi Valley. Highs will range from the lower/middle 30s north of I-40, and upper 30s to lower 40s south.
A 500 mb trough remains over the area this forecast period with cold air and a prolonged lake effect snow event. In the extended, GFS and ECMWF show a broad 500 mb trough 12z Sun with cold air. This trough and cold air remains through Thu with a prolonged lake effect snow event and below normal temperatures for this forecast period. Gale warnings and heavy freezing spray warnings are up across Lake Superior. Heavy freezing spray will continue through Friday night.
MET/MAV and better performing bias corrected grids support high temperatures ranging from the mid to upper 40s across the northeast and east to the low 50s across the rest of the area.
Wind will back to westerly as high pressure builds in to the south. * High for cig aob 5kft * Moderate for exceeding cross wind threshold from 300 degrees A low pressure system is passing through James Bay early this morning with an associated lead cold front moving through Michigan. There is an area of lift causing these returns from a jet streak and stream of PV moving around the base of the upper trough. This precipitation is high based and is having a tough time fighting through the dry air in the lower levels of the atmosphere, which is resulting in mostly virga. Temperatures will decrease throughout the day as the secondary cold front pushes through Michigan. Very cold and mostly dry conditions expected for Friday morning and afternoon as a large arctic high pressure drifts through the region.
Strong cold air advection continues to take hold this morning as Arctic air drops through the Northern Plains associated with broad upper-level trough pushing through the Upper Midwest.
Under sunny skies, temps will warm up nicely today topping out in the low to mid 70's region wide. High pressure northeast of Florida will keep light east to southeast flow in place today, turning onshore this afternoon with a sea breeze. A dry cold front will move southeast into the coastal waters late Friday.
/Issued 1032 AM CST Thu Feb 1 2018/ Cold front has pushed through the entire area as of late morning. The better push of colder associated with the higher wind gusts is currently across northeast Oklahoma and now entering northwest Arkansas.
Surface analysis early this morning places a cold front from Southeast Missouri back through Northwest Arkansas and into Southeast Oklahoma. A cold front is expected to move across the Mid-South today. Cooler and drier conditions are expected across the forecast area for Friday as a ridge of high pressure returns to the Lower Mississippi Valley. Highs will range from the lower/middle 30s north of I-40, and upper 30s to lower 40s south.
307 PM CST Thu Feb 1 2018 18Z surface data has high pressure across the Plains with a cold front across the Ohio and Tennessee Valleys. Quiet, breezy, and cold conditions will be seen from late afternoon through early evening as high pressure builds into the Midwest. Friday, the quiet conditions will continue during the morning as the high moves into the Ohio Valley.
This is in response to a rather impressive 140-150 knot H25 jet interacting w/an arctic cold front stalled along the I-80 corridor, likely contributing to strong low to mid level frontogenesis.
Surface cold front is now south of the terminals. A cold front will move through the terminals throughout the day brining a shift in the winds. /issued 327 AM CST Thu Feb 1 2018/ (Today and Tonight) Another dry cold front will move south across West Central Texas today.
The pressure gradient ahead of approaching high pressure will keep sustained north winds in the 15 to 20 mph range with gusts for much of the area through mid afternoon.
1032 AM CST Thu Feb 1 2018 Cold front has pushed through the entire area as of late morning. The better push of colder associated with the higher wind gusts is currently across northeast Oklahoma and now entering northwest Arkansas.
Even the previously aggressively snowing GFS has moved its focus on the Low moving to our north/west. with uniform southerlies in the lower trop thru the entirety of the qpf event. Early Tue, during the diurnally cooler part of the day, winds in a shallow layer near the surface will start out from the east or northeast, thus pcpn may start out as a wintry mix for us from the north, then is expected to transition to all rain by afternoon. Regardless of model solution, Wed is expected to be cooler and mostly dry under a mid level trof axis and increasing pressure at the surface.
216 PM CST Thu Feb 1 2018 Quiet weather tonight as high pressure continues to build into the area. As low level warm air advection develops Friday morning, the Nam and the Highres/NMM are suggesting that a few flurries could occur in northeast NE and and northwest/west central IA Friday.
315 PM CST Thu Feb 1 2018 Scattered light showers and patchy drizzle were occurring mainly east of the Mississippi River this hour with a passing cold front bisecting the CWA. Brisk north winds in the 10 to 25 mph range overnight will provide sufficient mixing which will only contribute to wind chills dropping into the low and mid teens by sunrise.
SHORT TERM (Tonight through Friday Night): The broad and deep 500 mb trough will dive around the central and eastern States tonight and Friday. This will push a cold front through the RGV later tonight through sunrise Friday. Surface coastal troffing is expected to form up on Fri and will likely continue into Fri Night which will maintain some potential for persistent areas of light rain/drizzle. The surface wind flow will become light and variable over much of the RGV and Ranchlands as the cold front approaches the region setting the stage for fog formation later tonight. However if the cold front slows up a bit a dense fog advisory may be needed.
A cold front passage will end steady precipitation early Friday morning.
While the low levels have ample moisture, the air above 850 mb is still very dry, thus the showers will remain shallow and light. These gusty north winds will be advecting in much cooler and drier air and so temperatures Friday morning will range from the freezing mark in our northern counties to near 40 in the Pine Belt. Conditions will be cooler and drier on Friday with highs in the mid 40s to mid 50s from north to south.
347 PM CST Thu Feb 1 2018 Latest surface analysis shows cold front now south of the Red River, with temperatures in the single digits and teens across the Dakotas.
Scattered snow showers or flurries were noted across north-central into far northeast Wisconsin due to the cold winds blowing across the relatively warmer waters of Lake Superior. Friday Night Through Thursday The upper level ridge continues to stay in the eastern Pacific, keeping northwest flow over our region through the period.
Initially, high pressure will build into the Mid and Upper Mississippi River Valley from the Northern Plains this afternoon and tonight. High pressure will build into the Ohio River Valley on Friday. As the trough digs in, flow aloft will become westerly and advect warmer air into the region. This will bring "warmer" temperatures with highs on Friday ranging from near 0 in the tip of the Minnesota Arrowhead, to the low teens in the Brainerd Lakes and Hinckley area.
248 PM MST Thu Feb 1 2018 Main concerns through Friday will be with winds in the wind prone areas, then with increasing snow over the higher mtns. Warmer Friday as the cold surface airmass banked up against the mtns erodes east and warmer downslope flow ensues.
A ridge is building offshore this morning, but lots of clouds continue to spill over the top and into our area. Offshore high pressure will weaken today. Offshore high pressure and a thermal trough near the coast will strengthen again Friday into the weekend, and this may bring small craft advisory north winds and steep seas to areas south of Cape Blanco.
Highs will likely be reached this morning, with temperatures then falling in the afternoon and especially this evening as a strong cold front sweeps across the region.
A dry air mass across the high plains and a lack of any forcing will keep precip chances out of western Kansas through Friday afternoon. With the help of decreasing clouds, should see lows down into the teens(F) across central Kansas to the lower to mid 20s(F) further southwest. A developing lee side trough will strengthen across eastern Colorado Friday bringing about gusty south- southwest winds by early afternoon, in turn drawing slightly warmer air into the area.
An occasional cold front will move through the Panhandles as upper level disturbances pass by to our northeast.
229 PM EST Thu Feb 1 2018 Rain should change to snow late this afternoon and evening with a crossing cold front. Snow shower chances should continue Friday with a trough of low pressure. The rain should change to snow later this aftn across the higher terrain of WV and MD before FROPA. NW flow, an approaching upper trough, and lake/terrain enhancement should result in additional snow showers overnight, as wrn and central portions of Lake Erie are ice free. The upper trough, combined with lake and terrain enhancement, should maintain sct-nmrs snow showers through part of Friday. Building high pressure and backing flow should end snow chances Friday night.
250 PM EST Thu Feb 1 2018 Much colder air continues to filter into the region behind today's cold front passage.
A dry air mass across the high plains and a lack of any forcing will keep precip chances out of western Kansas through Friday afternoon. With the help of decreasing clouds, should see lows down into the teens(F) across central Kansas to the lower to mid 20s(F) further southwest. A developing lee side trough will strengthen across eastern Colorado Friday bringing about gusty south- southwest winds by early afternoon, in turn drawing slightly warmer air into the area. A trough of low pressure will deepen along the lee of the Rockies from Friday into the first half of the weekend as a northwesterly down slope flow improves across eastern Colorado and western Kansas.
339 PM CST Thu Feb 1 2018 Currently, old cold frontal boundary that worked through the area has continued to wash out during the day over portions of southern KS. This has caused cooler temps than expected over northern counties so had reduced high temps this afternoon earlier by a couple degrees. Expecting over night low temps to dip into the low teens and possibly single digits in far northeast Kansas.
An upper trough pushing through the central Plains will move eastward, with the base of the trough moving into the region by Friday morning. A weak cold front will push through Georgia tonight, and towards the region around daybreak on Friday. Overnight lows will be near 50 to the lower 50s. Cooler air will start moving into southeast Georgia by Friday afternoon, and highs will be cooler in the lower 60s. Across northeast Florida, temperatures will be in the mid 60s to the lower 60s.
257 PM EST Thu Feb 1 2018 A cold front, will bring light rain and snow, to most of the area this evening.
Higher RH 1000-700 mb air upstream will move through during this time and omega in the DGZ layer is expected to increase as the upper level trough comes overhead. Ridging late Friday morning will shift winds west and spread snow farther inland before the inversion falls enough to diminish the lake effect.
/issued 326 AM CST Thu Feb 1 2018/ Broad troughing over the central/eastern portions of the CONUS combined with an upper level ridge to our west will keep the FA under northwest flow for the entire forecast period.
Strong cold front has moved se of the Ohio river into nw parts of KY/TN and central AR late this morning. Still have a chance of light rain showers mixed with flurries se of I-70 late this morning, otherwise clearing skies from nw to se during the afternoon as 1037 mb arctic high pressure over Saskatchewan and eastern Dakotas settles into the Midwest during this afternoon/evening. Cold front was approaching the Illinois/Iowa border as of 2 am, with temperatures behind it quickly dropping into the teens.
After 00z, a band of showers associated with a cold front should pass over the terminals.
221 PM EST Thu Feb 1 2018 High pressure off the Southeast Coast will move farther out to sea allowing a cold front to cross the region early Friday morning.
/issued 257 AM CST Thu Feb 1 2018/ Cooler temperatures expected today compared to yesterday with highs in the 40s and 50s.
/Today through Tonight/ Cold front continues to push through the state and will clear the southern border by 12Z.
329 PM CST Thu Feb 1 2018 Cold high pressure has settled into the Northern Plains with upper level subsidence providing plenty of sunshine other than some flat low level CU. Warming over SW MN will be the most tempered as highs will likely only reach the low to mid 20s over this region.
The strong Arctic cold front has raced southeast of the area early this morning with gusty northwest winds and falling temps behind it. Skies will clear this evening as high pressure approaches from the west. Some model guidance tries to break out some light warm advection snow by afternoon but initially much of the lift will go into saturating very dry air in the lowest levels of the atmosphere.
Main cold front is pushing thru our CWA right now.
248 PM CST Thu Feb 1 2018 Cold front from near Mineola to El Dorado continues to make its way swd this aftn. Strong nly winds in the wake of the front tonight /Lake Wind Advisory remains in effect from 4 PM to midnight for portions of the region/ will help usher in a much cooler airmass that will keep us from getting out of the 40s and 50s for daytime highs Friday.
Canadian high pressure was moving into the region today behind a cold front that moved through the region last night. As the high settles over the area tonight temperatures will fall into the middle teens to single digits with light winds. Temperatures will then only warm into the 30s across most of the area Friday with some locations in extreme southwestern Missouri in the lower 40s.
Otherwise the quiet pattern continues with the eastern Pacific ridge maintaining dominance. A little cooler temps over the weekend with those onshore trends but still well above normal.
The cold front has moved through the northern half of the CWA. Compressional warming ahead of the front had allowed temperatures across the southern CWA to rise into the low 80s. Cooler and mostly cloudy on Friday with highs only in the 50s.
Initial cold front had pushed through much of the area with a secondary front near the Missouri / Iowa line as of 2 AM. the secondary cold front will continue to advance south into the area. Temperatures will still be on the cool side with highs from the mid to upper 30s and lows Friday night from the low to upper 20s.
317 PM EST Thu Feb 1 2018 A cold front will move through late tonight.
312 PM CST Thu Feb 1 2018 Mid afternoon surface map shows a strong cold front pushing southeast into southeast KY, mid TN and nw MS. 1036 mb arctic high pressure was over se Saskatchewan and North Dakota and ridging into the Central Plains. Temps were in the lower 20s north of I-72 with Galesburg at 19F while temps have fallen to around 30F in southeast IL. A very cold night ahead as skies clear with arctic high pressure building into MO/IA by dawn Fri. 1037 mb arctic high pressure will drift into the mid MS river valley by midday Friday and bring a sunny but cold day in the low to mid 20s across central/se IL.
Arctic high pressure continues to build across western and central North Dakota. Under high pressure, today will be clear, calm and cold.
Big ridge wobbling between 125W and 140W will be the main feature through the period, leaving our area dry with periods of high clouds.
Coverage should increase a more during the afternoon as WAA continues/strengthens just ahead of the cold front currently moving into the northern portions of the CWA.
234 PM CST Thu Feb 1 2018 Rains have finally moved into Middle TN this afternoon as a cold front approaches from the northwest. Everybody in the mid-state is currently in the mid-40s or warmer, but wind shifts are already being seen across the northwest and KBNA winds have shifted to the northwest this past hour.
Breezy north winds continue across the area this afternoon behind a cold front that moved through earlier today. Lows tonight will range from the upper 20s north, to the lower 30s south.
Added patchy/areas of fog to the nearshore waters/coastal lakes and bays and immediate coastal inland areas later this afternoon and into tonight, as there is a strong signal in guidance that continued advection of lower/mid 60s Td air atop relatively cooler shelf waters will yield sea fog formation prior to FROPA late tonight. /issued 649 AM CST Thu Feb 1 2018/ Clouds spilling into the region today ahead of a cold front. A cold front is still progged to move through the region late this evening into early Friday morning accompanied by isolated to scattered showers, the majority of which should be over by sunrise Friday. With CAA filtering in behind the front, Friday is shaping up to be a rather nice day although afternoon highs will be running about 15 degrees cooler than we'll see this afternoon.
344 PM CST Thu Feb 1 2018 Cold front/pre-frontal trough currently making its way into SE TX this afternoon, but not seeing a lot of activity with its passage thus far. The persistent sub-tropical jet pattern should keep things active across SE TX for this weekend as a series of disturbances move in from the west/southwest and interact with a warm front lifting up from the Gulf. Elevated rain chances will continue into Sun, with the passage of the next cold front. Models shunting the brunt of the coldest air off to our east as the associated upper low quickly tracks NE ac- ross the Northern Plains.
WV imagery shows an upper- lvl trough swinging thru the MS Valley, trailing a cold front that at 07Z was oriented NW-SE across the S.
Farther inland in the valleys, mountains and deserts it will remain sunny and warm with strong high pressure off the West Coast. WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO Thursday was another sunny, warm day for most of Southern California with highs in the 70s and 80s in the lower elevations, and the 60s and low 70s in the mountains. The low clouds and dense fog were already returning to the beaches this afternoon where Mission Beach reported 1/16 mile vis and Solana Beach reported 1/2 mile vis. The shallow 200 foot deep marine layer will keep the coast much cooler than inland areas, with low clouds and dense fog probably locked in at the coast through the afternoon.
Patchy light rain is expected ahead of a cold front but most TAF sites may not see any rain. A broad upper trough will brush by the area to the north today, pulling subtropical mid-level moisture into the area. The area of high pressure at the surface will be situated to the east of the area, allowing for weak southerly flow across the area and a modest moistening of the boundary layer. This will yield increasing cloud cover through the day and eventually shower chances this evening, as a cold front approaches the area from the northwest.
419 PM EST Thu Feb 1 2018 Tonight through the upcoming weekend: high pressure over the western Atlantic which has been providing gusty NE winds the past 2 days will weaken tonight and Friday, leading to a lighter wind regime at least through Friday. A few showers could make their way back to the east coast metro areas on Friday as convergence increases ahead of the next cold front moving down the state, but POPs remain no higher than 20 percent. The cold front will move through South Florida Friday night, but unlike the past couple of fronts, this one is in a mostly zonal (west to east) mid/upper level pattern.
1225 PM EST Thu Feb 1 2018 High pressure off the Southeast Coast will dominate through today. An approaching cold front and light rain will cross the forecast area late tonight into early Friday morning.