Aikyam-Lab/Synoptic-Bench huggingface dataset:
A surface trof of low pressure will move southward across the terminal sites on Sunday, with winds becoming north in its wake. This will then be followed by a weak backdoor cold front Sunday evening. /Issued 526 PM CST Sat Jan 27 2018/ For the 00Z TAFs, a surface trof of low pressure will move southward across the terminal sites on Sunday, with winds becoming north in its wake.
Otherwise, no significant forecast updates are needed this evening as mostly clear skies get replaced by high clouds overnight as a cold front approaches from the north. High pressure is building into the region this afternoon, bringing mostly sunny skies and temperatures still quite mild with the colder air hanging back to the NW. Quiet weather as cooler air moving into the region, and the northwesterly winds will drop tomorrows high temps into the 40s. The weak wave is running over a high pressure ridge at the surface. The mid level trough of cold air drops into the Midwest Sunday night. By Monday, high temps are falling into the 30s with the northern half of the state struggling to even get close to freezing.
201 AM MST Sun Jan 28 2018 Latest satellite imagery shows northwest upper level flow over the west half of the CONUS with an upper level short wave trough moving southeast over the Northern Plains. Along and behind the trough cloud cover was spreading southeast across the CONUS. Lows will be slightly warmer than last night due to the cloud cover. Sunday morning the cold front will move through in the morning.
323 AM CST Sun Jan 28 2018 Today and Tonight: Circulation around low pressure along the MS coast continues to provide ascent with areas of rain still occurring over mainly eastern sections. As the low pulls east into AL, low level northerly flow in its wake will limit convergence with the front moving across the area. Drier/cooler air will spread into the region this afternoon and tonight as pressure graident maintains cold air advection.
359 AM CST Sun Jan 28 2018 This week will be characterized by a couple of colder days followed by a couple warmer days followed by colder temperatures with the chance of accumulating snow over the weekend. The veering winds behind the cold front this morning are picking up in the 10 to 20kt range with some higher gusts. Highs today should be around 20 near the South Dakota border to the lower 30s toward the KS/MO border.
Another front will then move through and cause highs to stay below freezing Monday.
343 AM CST Sun Jan 28 2018 An upper level trough will continue to shift east across the Mid South this morning with a weak cold front settled along the northern Gulf Coast states. A strong cold front will sweep across the region on Monday with much colder temperatures filtering south.
1051 PM CST Sat Jan 27 2018 Cold front has remained nearly stalled, near a keld to kshv to just south of ktyr line. /issued 1001 PM CST Sat Jan 27 2018/ The cold front continues to make slow Swd progress across Deep E TX/Ncntrl LA this evening, with winds finally shifting to the N along a DKR, to OCH, to 3F3 and N of a RSN line as of 03Z.
258 AM CST Sun Jan 28 2018 Arctic high pressure will begin to settle into the region today, bringing much colder temperatures with highs in the upper teens to lower 20s.
A ridge of high pressure centered over the plains is currently building into the area behind a Pacific cold front. Ahead of the front a weak area of low pressure is near the mouth of the MS River. The majority of the rainfall continues to shift east with the low, however light rain is still falling over the coastal waters and South Central LA. The ridge will continue to build into the area today pushing the low farther away.
255 AM EST Sun Jan 28 2018 Rain gradually ends today as a cold front passes.
258 AM EST Sun Jan 28 2018 A cold front push off the coast this morning.
A secondary weak wave and associated cold front will continue to move southeast across the area this evening into the overnight hours. Arctic high pressure builds in across the International Border and North Dakota on Sunday, leaving the area under a cold northerly flow; cooling down temperatures to below normal. Highs both days will range in the upper teens and 20s, with the lowest readings across southwest Minnesota.
338 AM CST Sun Jan 28 2018 An arctic cold front will become stationary from northwest to southeast across the area today. Warmer readings near 40 degrees can be expected south and west of the front across far southwest Nebraska and the panhandle.
256 AM EST Sun Jan 28 2018 A cold front will spread rain across the area tonight through Monday morning.
255 AM MST Sun Jan 28 2018 Current surface analysis shows cold front south of the forecast area, with high pressure over south central Canada. Upper level analysis shows ridge along the west coast, with strong northwest flow extending from southwest Canada into the northern and central Plains. Highs today will range from the upper teens over far northwest SD to the low to mid 30s over northeast WY.
1059 PM CST Sat Jan 27 2018 An area of MVFR clouds will wrap around the back side of the low pressure center. The cold front has pushed through the majority of South Central Texas. What that means is that the upper level trof axis will very slowly push through South Central Texas. So it will take a while for the low clouds to scour out, probably not until Sunday late morning or early afternoon. Cooler temps then on Sunday night and early Monday morning with better radiational cooling.
Llvl cloudiness persists early this morning across the region with significant moisture generally confined to the lowest 100mb. Before then, a s/w trough at H5 and the tail end of a 70kt H25 jet streak will shift east across the region this morning. Much cooler tonight with lows in the 40s to perhaps upper 30s across rural inland areas.
Surface analysis indicates surface ridging building into the region this evening in the wake of last night's cold front. With ridging expected overhead tonight and clear skies, conditions will be optimal for radiational cooling.
1223 AM EST Sun Jan 28 2018 Rain through tonight with a crossing cold front. Rain chances continue Sunday south of Interstate 68, with dry weather expected under high pressure elsewhere. Still expect some subfreezing temperatures by morning across the north. The deepening trough advancing out of the Midwest is progged for a Monday/Monday night approach. Increased POPs to likely for some areas as models indicate increased convergence with a low-mid level trough.
SHORT TERM (Today through Monday): Satellite and radar images continue to indicate convection developing across northeast Mexico into the western Gulf of Mexico along a weak cold front draped across the area early this morning. Highs Monday will be slightly warmer than today.
Cold front currently draped from VCT to LRD, with -RA/SHRA mix south of the front.
Any cooler temps would be occurring after Monday night.
454 AM EST Sun Jan 28 2018 The mean layer ridge has shifted east over the past 24 hours and heights have responded by falling at all significant levels (see last evening's RAOB analyses). Temperatures are in the lower 70s and dewpoints are in the upper 60s.
Today Through Monday Night Cold front was situated just to the SE of the FA early this mrng. Weak ridge of high pres wl briefly take control of our wx today, before shifting S of the area tngt.
321 AM CST Sun Jan 28 2018 Surface ridging builds into the region.
A slow moving cold front and band of showers will continue to move across the area overnight into Sunday morning.
1017 PM MST Sat Jan 27 2018 Latest satellite imagery shows northwest upper level flow over the west half of the CONUS with an upper level short wave trough moving southeast over the Northern Plains. Along and behind the trough cloud cover was spreading southeast across the CONUS. Lows will be slightly warmer than last night due to the cloud cover. Sunday morning the cold front will move through in the morning.
Rain will be decreasing in the afternoon, but low cigs will persist into the evening behind the cold frontal passage.
Temperatures tonight will be mild with low falling to around the freezing mark. Cooler temperatures will also move into the Ozarks with high temperatures on Monday only in the 30's.
227 AM MST Sun Jan 28 2018 High pressure aloft followed by westerly winds will bring mostly sunny dry weather across southern New Mexico and west Texas this week with temperatures remaining near or above normal each day.
324 AM CST Sun Jan 28 2018 At 3 AM, a cold front was draped from Lake Huron southwestward through northern Michigan and across southern Wisconsin and into northern Iowa. Temperatures across eastern Iowa ranged from the mid 20s along the Highway 20 corridor to the lower 30s in far southeastern Iowa, northeast Missouri, and west central Illinois. Any snowfall amounts will be light and most likely along the Highway 20 corridor this morning. Precipitation this morning will likely be snow but a rain and snow mix may be possible by 15 utc as temperatures warm in the lower levels. Monday night will be especially cold with the ridge overhead, even though there will be little or no snow cover.
A ridge of high pressure will keep things mostly dry over the Great Basin through mid week.
1246 AM EST Sun Jan 28 2018 A trof of low pressure will cross the region overnight, with a cold front crossing Sunday afternoon. High pressure will build in from the west Sunday night and crest north of the region on Monday.
/issued 1254 PM CST Sat Jan 27 2018/ A broad upper level trough centered across the plains will slowly move east and amplify into the Ohio Valley by Monday. A reinforcing cool surge of high pressure is expected Monday as the upper trough amplifies and temperatures Monday will get knocked back a few degrees to near normal values.
A warm front will move north through the area tonight and Sunday morning.
1247 AM EST Sun Jan 28 2018 Rain will continue to end as a cold front moves through the area and weak high pressure builds in from the west. An upper level disturbance along with another cold front will bring cooler temperatures and a chance for some light snow on Monday. Previous discussion ---> Surface cold front evident on radar/sfc observations moving though south central Ohio and northeast KY. Period starts with an upper trough approaching from the west.
1125 PM EST Sat Jan 27 2018 Rain will continue to end as a cold front moves through the area and weak high pressure builds in from the west. An upper level disturbance along with another cold front will bring cooler temperatures and a chance for some light snow on Monday. Previous discussion ---> Surface cold front evident on radar/sfc observations moving though south central Ohio and northeast KY. Period starts with an upper trough approaching from the west.
Strong cold front will move into northeast Oklahoma this evening, surging south into the ARKLATX by Monday morning. Cold/breezy conditions expected during the day Monday with lingering low clouds behind the front, especially across northwest Arkansas where temperatures could struggle to reach into the lower 40s.
109 AM EST Sun Jan 28 2018 A cold front will spread rain across the area tonight through Sunday night.
225 AM CST Sun Jan 28 2018 Early morning surface map showed the next cold front not too far to our northwest, across southern Wisconsin and northern Iowa. GFS forecast soundings are fairly moist most of the way up, while the NAM is limiting most of the moisture to about the lowest 5,000 feet of atmosphere. Bumped up PoP's a bit due to the strength of the energy coming in, though snow amounts still look on the lower side, mainly a dusting.
1134 PM CST Sat Jan 27 2018 An upper level trough was located over the SD/MN border and was moving to the southeast at 35 knots. The cold front continues to sag slowly southward late this afternoon, and as of now was located somewhere along a line from Cooperstown to Hillsboro to Park Rapids. High pressure builds in on Sunday with lighter winds and more sun, but cooler as well. An Arctic high pressure continues to slide into the region from the northwest through Monday. Guidance still wants to move a weak short wave currently in northwestern Canada into northern Minnesota, although the dominating high pressure and current forecast track keeps snow chances of flurries quite small for northwestern Minnesota counties Monday.
Short wave trough bringing good coverage of light snow to the eastern part of the cwa late this afternoon and evening.
Both the GFS and ECMWF have the trough digging further south with each run, and now has precip developing for mainly the eastern half of the area.
1155 PM EST Sat Jan 27 2018 Snow will be moving in from the NW this evening and tonight as a cold front drops through the area, promoting lake effect snow in NNW wind belts behind the front. Conditions will be cooler behind the front, with lows tonight in the teens and highs on Sun from the mid teens to mid 20s, warmest SE. Overall, we're looking at a sharp cool down later this week as a vigorous longwave trough starts to dominant the upper-air pattern across the central and eastern CONUS. Prior to the onset of this persistent troughing, we will see temperatures fluctuation through the middle of the week with chances for lake effect and system snow.
However, weakness in the pressure pattern over the Srn Sac Vly/Nrn SJV suggests that decoupling of the lower atmosphere will occur by Sun morning and radiational fog will form due a very moist PBL. Building ridge over the region this weekend will result in some variable high cloudiness spreading from NW-SE over the CWA. JHM A ridge of high pressure will be building stronger over the area the next couple of days. Temperatures will become much warmer the next several days and may peak on Monday.
Clouds to continue to erode from the northwest across the region throughout the day with temperatures forecast to climb to the low to mid 60s. Northeast winds around 5 to 10 mph to prevail today, becoming 5 mph after sunset as high pressure becomes better established across the region. Low temperatures tonight to fall into the low to mid 30s. Pressure gradient to become more enhanced on Monday allowing for northwest winds to increase to 10 to 15 mph as reinforcing high pressure surges south across the region. Temperatures on Monday to climb into the mid to upper 50s with lows in the upper 20s to near freezing on Monday night.
Deep layer ridging over the Southeast will begin breaking down on Saturday as a trough moves through the central CONUS. Highs will remain in the lower to middle 80s.
While the upper trough is positively tilted currently, it becomes more negatively tilted as it heads into the Dakotas/Minnesota later today. The deterministic NAM looks like the high end of guidance while the GFS deterministic is a bit more modest. Omega values as the trough transitions increases to 10 to 20 microbars between 15 and 21Z with the GFS being a tad faster which is also the reason for the lower QPF. Again, this is mainly at the 600-500mb levels with less lift in the low levels, but it still appears that this will occur over a deep dendritic growth zone, which may push up the snow ratios some.
130 AM CST Sat Feb 24 2018 Warm frontogenesis is currently underway across Middle Tennessee as a strong low pressure system develops over the southern Plains. The warm front will gradually lift northward today as the aforementioned low center moves toward the northeast to near STL by 00Z Sunday. In addition, a highly-sheared low-level wind profile will contribute to 0-3 km helicity values of 100-200 today, increasing to 400-500 during the evening as the low-level jet intensifies just ahead of the cold front.
Surface analysis shows the cold front over SE Utah and very evident uplift enhanced by the jet above the frontal boundary. The 700 mb and 500 mb troughs will move across the area tonight thus the flow aloft will shift to the northwest and cause some enhanced orographic snow on favored slopes. The next significant and fast-moving trough within the northwest flow will move across eastern UT and western CO Saturday night. The trough moving across the area from northwest to southeast will bring another quick shot of snow to all elevations through Sunday morning and then just as quickly clear the area to the east Sunday afternoon.
There still looks like a chance of showers in the area in the morning ahead of the lead short wave trough and jet streak.
Cote' 00Z TAFS: A cold front is moving through the area at the time and will bring a band of light to moderate snow to the eastern TAF sites 00-03z.
1113 PM MST Fri Feb 23 2018 A series of short wave low pressure troughs in westerly flow will bring Pacific moisture into the western mountains of Wyoming with light snow developing later tonight with very light accumulations possible. Periods of snow will then continue in the west trough the weekend with a break late Saturday night and early Sunday morning.
Cooler air is working in from the west behind a cold front crossing the central mountains, but it will remain mild for a few more hours yet over the Laurels.
The Winter Weather Advisory in the Catskills and Oneida county has ended this evening as temperatures have and continue to warm above freezing and the main area of significant precipitation has moved east out of the area. Some locations still may see drizzle or even some isolated freezing drizzle in Delaware and Sullivan counties where the colder air remains this evening. Fortunately, most of the forecast area has had surface temperatures warm above freezing. Thus, areas of light freezing rain/freezing drizzle are expected, and winter weather advisories will remain in tact for these locales. Given the lack of any significant low-level cold advection, readings will not drop much overnight, and will range in the 30s (generally above freezing) by daybreak.
The most recent trough is on its way out of the area this evening with skies rapidly clearing out except for some lower clouds near and banked up against the mountains. Snow may begin to develop near the Idaho border by mid- morning, then increase during the afternoon hours while spreading southward as the next trough approaches the area. The SLC terminal will trend towards clearing out of the lower clouds through late tonight.
Speaking of colder temperatures, temps hovering near the freezing mark across northwest Oklahoma will continue through at least 8 or 9 am with potential for at least patchy freezing drizzle.
110 AM EST Sat Feb 24 2018 Unseasonably warm high pressure will prevail into Sunday.
The widespread snow will become showery in the afternoon behind a cold front. It will also become windy, especially in southeast Oregon and behind the cold front in southwest Idaho Saturday afternoon with west-northwest winds of 15 to 25 mph with higher gusts.
Showers will return later tonight as a cold front approaches from the west. Models continue to show the highest rainfall amounts over southeastern Ohio and northern West Virginia, although amounts are toned down compared to previous runs. east-west oriented stationary front at the beginning of the period should push north of the area Saturday night with a cold front then expected to sweep east on Sunday. As the cold front pushes east, precipitation chances should end from the west. Until the front pushes east, models indicate precipitation chances will remain high with the highest QPF still expected across the southeast Ohio counties as well as the West Virginia counties adjacent to the Ohio River.
Light freezing drizzle and fog has overspread parts of southwest Kansas from Dodge City to Elkhart. Freezing drizzle is expected to continue across the region through the overnight and eventually moving into areas from Scott City to Hays. Low clouds, fog, freezing drizzle and possibly even some light snow can be expected across much of western and north central Kansas late tonight and early Saturday morning.
1227 AM EST Sat Feb 24 2018 A weak area of low pressure will pass north of the region overnight. High pressure will build back into the region Saturday and Saturday night. Low pressure will track across the Gulf of Maine Sunday night. Still plenty of low level moisture in place so some very light snow or patchy freezing drizzle will be possible overnight. High pressure just to the north of the state wl bring ridge axis thru the area Sat night. Thus, pcpn slowly transitions to a drizzle/freezing drizzle scenario acrs the south aft 02z and by midnight acrs the entire area.
An area of low pressure will push to the east tonight, but snow showers will linger this evening across portions of Mohave County. With the loss of daytime heating and the trough responsible for todays activity pushing east, things are quickly winding down.
1112 PM CST Fri Feb 23 2018 An impressive upper level low pressure rotating across Utah and moving into Wyoming this afternoon. There will be a developing mid level warm front near the Missouri River from 9-12z but still in the early stages so not expecting any snowfall before 12z.
/issued 725 PM EST Fri Feb 23 2018/ 00Z water vapor and H4 RAP analysis show the Florida peninsula continues to reside under unseasonably strong mid/upper level ridging. The forecast through the weekend does not change much as this ridge holds firm.
1037 PM MST Fri Feb 23 2018 A large upper trough stretches across the central and western CONUS, with southwest flow over the CWA. At the surface, high pressure sits over SD. Snow will begin spreading across the area tonight as the initial wave associated with the upper trough crosses the northern plains. Models are showing a low pressure system developing over southern CA early in the week, but most of the energy associated with this system should stay south of the CWA.
For the Plains, soundings indicate that the potential the for freezing drizzle will be possible. Most locations have freezing drizzle back to La Junta, although it could be a bit further west. For now, have the greatest potential for freezing drizzle to remain in place for the far Eastern Plains. the expected trough over the region is forecast to move away from the area with westerly flow aloft replacing it. Westerly flow will mix down the the surface helping to warm up the Plains into the lower 40s. Look for highs in the 20s and 30s for the high valleys, and 40s to near 50F for the plains.
The warm sector will push into southeast Oklahoma and west central Arkansas, and will give these locations the highest potential for a few severe storms along and just ahead of the pacific cold front.
Wind speeds still look to remain on the lower side, so blowing and drifting snow should not be an impact. Diminishing snow and calmer weather are expected for Sunday as the low pressure system moves off into the Great Lakes region.
The passage of a Pacific cold front ends the rain early to mid afternoon with clouds eroding to VFR skies as winds shift to W to NW at 5 to 10 KTs, then N Saturday night. Late afternoon surface observations show a warm front is moving northward across south central Texas. The warm front will continue to move northward this evening and overnight as southerly flow in the low-levels increases. Precipitation chances will continue tomorrow morning across most areas as a Pacific cold front moves in from the west. For Saturday night, the cold front will push into the coastal plains, leaving rain chances only for areas east of the I-35 corridor.
Showers will return later tonight as a cold front approaches from the west. Models continue to show the highest rainfall amounts over southeastern Ohio and northern West Virginia, although amounts are toned down compared to previous runs. The cold front will cross Sunday, taking the wet weather with it. A cold front will push into the area from the northwest early this morning. Expect LIFR conditions to develop behind the cold front.
This afternoon a Pacific cold front will move into the Hill Country and Rio Grande. The cold front will push through the remainder of the CWA this evening. Cooler Sunday, especially eastern areas which may struggle into the low 60s remaining under the cloud cover most of the day.