Aikyam-Lab/Synoptic-Bench huggingface dataset:
400 AM CST Sun Dec 4 2016 Current surface analysis places low along the Saskatchewan/Alberta border with trough dipping down into the northern plains. Upper level analysis places trough slicing through the plains which produced some periods of snow overnight. Weak impulse on the back-side of the trough is producing a little bit more light snow over northern portions of our area. weak ridge develops over the area in the wake of the departing trough with dry conditions developing as it moves east. In the meantime, an upper low over northern Saskatchewan gradually deepens. first impulse swinging around aforementioned upper low pushes into the area with snow chances gradually spreading from west to east. Short wave swinging through the area starts to close off near the international border on Monday while cold front swiftly moves through the area.
The flow will back and become more west-northwest for tomorrow, with temperatures expected to become warmer ahead of the next approaching storm system.
/issued 228 PM CST Sat Dec 3 2016/ Combination of closed upper low to our southwest and trough moving through central and northern plains will continue to provide sufficient lift for widespread light rain and drizzle overnight. As upper trough moves east late tonight and Sunday most of the light precip is expected to end as lift shifts east and drier air moves into the area. Most areas should see some sun tomorrow with warmer temps and light winds. Upper low is then expected to lift east and northeast on Monday and will provide parts of the area another chance for some rain.
357 AM CST Sun Dec 4 2016 Mid/upper level trough responsible for the band of rain is currently moving over central KS. The temperatures may stay in the lower 40s where there is snow on the ground. As a result, breezy southerly winds will push temperatures above the seasonal normals with highs in the low/mid 50s.
With the cloud cover and rain, temps should stay about where they are now, in the low 40s. The upper low will move across northern Mexico into Monday. This low will track to the northeast across the Deep South and Tennessee Valley, continuing to bring widespread showers to the area.
1030 PM MST Sat Dec 3 2016 An upper level trof over the state today, will move east of the area this evening. Some low clouds have been covering the far sern plains today, but as the upper trof moves out of the area this evening, these clouds are expected to move out as well. Although some of the low clouds could continue in the San Luis Valley this evening, they are expected to dissipate by late night. The San Luis Valley is expected to to have slightly cooler than average temps, with highs in the upper 20s to lower 30s.
This feature will support the potential for continued light precipitation mainly across east and southeast sections, while also driving a weak cold front into the area, causing clearing from the northwest overnight. There is a very slight chance for isolated areas of brief light freezing rain to develop just prior to the ending of the light rain. Apart from some morning fog on Sunday, generally clear sky should allow for respectable warmup on Sunday and especially Monday, when southwest and south winds resume ahead of deepening lee trof.
941 PM PST Sat Dec 3 2016 Deep low pressure will bring rain, wind, and heavy mountain snow to the Inland Northwest tonight into Sunday.
315 AM EST Sun Dec 4 2016 A ridge of high pressure will slowly build into the region today, before moving offshore tonight.
421 AM EST Sun Dec 4 2016 High pressure approaches from the west today and passes east of the area late tonight.
Off to the northwest in Washington and Idaho, widespread snow being reported on area METARs with a low pressure system moving towards Wyoming.
Latest water vapor satellite imagery shows upper low over Mexico with a short wave trough moving across the Northern and Central Plains this afternoon. Best deep layer forcing will occur ahead of the approaching trough this evening through 10Z Sunday. Lows tonight will only cool into the lower 30s in north central to the upper 30s east. Sunday night and Monday look to stay dry as a southern stream low lifts northeast just south of the northeast Kansas and a northern stream trough axis only digs as far as Nebraska. Southerly flow keeps Mondays high temperatures in the lower 50s as the area remains between these two systems.
Upstream sharpening mid-level trof and surge of warm, moist air currently causing widespread mostly -sn across IA into srn MN and has recently began spreading into parts of western and SW WI. Mid-level trof expected to move eastward across southern WI today with further sharpening in the mid-levels. Trof takes on slight negative tilt as it passes this afternoon. Sfc winds will turn SSE which will carry slightly warmer air over the shore areas. High High pressure will move through briefly on Monday. May actually see breaks in the clouds in the morning, though clouds will likely be on the increase by afternoon ahead of the next approaching trough.
This forcing is expected to continue this evening until the axis of the trough shifts east after midnight. Temperatures through the event are expected to be near or slightly above freezing, which should help mitigate some of the impacts. Once the trough shifts to the east we will see clearing skies on Sunday with winds become west and northwest through the day, which should lead to decent mixing and warmer temperatures with highs climbing into the 40s for many areas. Moisture will be limited to the southern Plains associated wtih the ejection of the current closed low, but strong low-level frontogenesis may allow for some flurries or a brief period of light snow across western Iowa just behind the front.
Starting to have some returns on radar out west with the next short wave trough moving in. As of 20Z, an upper level trough of low pressure is located over South Dakota with a WAA band of pcpn crossing the eastern CWA. With temps aoa freezing, believe most of the pcpn will fall as rain, with pockets of snow. A low pressure system will begin crossing the region late Sunday night through Monday night. With temps in the low to mid 30s today and Sunday, the current snow cover will not be a factor. The main story at the beginning of the extended will be the broad upper trough that digs into the plains.
1221 AM EST Sun Dec 4 2016 High pressure will build across the region late tonight through Sunday. A weak trough of low pressure will cross the region Monday into Monday night. High pressure builds across the region Sunday. Low temperatures tonight will range from around 20 to the lower 20s north, to the mid to upper 20s Downeast. High pressure cresting over the area Sunday night will bring clear and calm conditions resulting in the coldest night so far this season. A very weak trough of low pressure will then approach on Monday bringing a mostly cloudy sky and just a slight chance for some snow showers Downeast.
1241 AM EST Sun Dec 4 2016 Weak upper trough Sunday into Sunday night.
For 06z Aviation discussion below Snow is now pushing into far southwest Minnesota from South Dakota, Iowa, and Nebraska as a trough lifts northeast from the central Plains. Most of the snow will fall late tonight and Sunday in those locations, when temperatures may be warming into the low to mid 30s.
A trough of low pressure will slide through the Great Lakes on Sunday and Sunday evening, bringing a period of light to moderate snow. Some roads, especially bridges and overpasses, could become slushy during moderate snow. Road surfaces could also quickly become icy Sunday evening and Sunday night and temps drop back below freezing. Highs Sunday afternoon will likely be in the low to mid 30s. Persistent slick roads could affect traffic Monday morning, as surface temps will remain a bit below freezing.
Deep layer ridging will setup across the region through Friday with the moderating trend continuing. Skies will remain mainly clear today, but as the low level moisture gradually increases in the east to northeast flow off the Atlantic we will begin to see some scattered to possibly broken stratocumulus/altocumulus tonight into Friday under the subsidence inversion.
620 AM EST Thu Nov 17 2016 Dry high pressure will extend into the area from the west through Friday with above normal temps.
High pressure covers much of the eastern U. This high will provide one more day of dry weather with temperatures remaining well above normal. By Friday, A fairly strong cold front will sweep through the region. Temperatures will be a little cooler on Friday with highs mainly in the 70s. The cold front will be east of the region by late Friday night. Much cooler and drier air will move in behind the front.
just a tad cooler coastal Volusia Co where cooler onshore component expected to hold high temps in the mid 70s. High pressure centered over AL this morning will move E/NE to the Carolinas by tonight. A slight tightening of the gradient is forecast tonight as the high strengthens a few millibars over the Carolinas.
1024 AM EST Thu Nov 17 2016 Dry high pressure will extend into the area from the west through Friday with above normal temps.
This morning's sounding is significantly warmer in the low-levels than yesterday, which should allow high temperatures today to climb into the mid 70s to lower 80s. VFR through the next 24 hours under high pressure.
439 AM CST Thu Nov 17 2016 An upper ridge will move east of the area today while a strong upper trough digs into the Four Corners Region.
Models remain in good agreement with the passage of a cold front Friday into Friday night.
617 AM EST Thu Nov 17 2016 Aviation A couple of mild days are expected with highs well into the 60s today and Friday before a strong cold front arrives Friday afternoon.
408 AM MST Thu Nov 17 2016 Current surface analysis shows cold front from eastern ND to central SD to western Neb. Low pressure is developing along the front across northeast CO. Upper level analysis shows ridge axis east of the region, with trof axis over the Great Basin, moving quickly eastward. Southwest flow ahead of the trof is helping to produce some light pcpn across western WY and southern MT this afternoon. The upper trof looks to be a fairly quick mover, with snow ending from west to east Thursday night. Upper level ridge will build over the northern plains for the weekend, with dry weather returning.
A high pressure system will expand and intensify over the eastern United States this afternoon through Friday night, resulting in fresh northeasterly breezes across Florida Keys coastal waters.
1047 AM EST Thu Nov 17 2016 High pressure will prevail through late week.
High pressure will remain in place today as temperatures climb into the lower 80s.
Guidance suggest high temperatures may be a bit warmer than previously forecast and have adjusted upward a degree or two. High pressure centered over the Central and Southern Plains will maintain a moist southerly flow over the region with light winds. This combined with relatively strong upper level ridging will continue to favor very warm afternoon temperatures. Highs will rise into the lower 80s most places, with middle and upper 70s along the coast. With the ridge aloft and high pres at surface. clouds will be increasing as an upper level trof and the cold front approaches our region.
With the ridge aloft and high pres at surface. clouds will be increasing as an upper level trof and the cold front approaches our region.
1048 AM EST Thu Nov 17 2016 High pressure through Friday.
Below freezing temperatures reported in interior valley locations this morning.
948 AM EST Thu Nov 17 2016 High pressure builds overhead through Friday.
This was due to a double jet structure bringing upper divergence to the area, as well as difluence from the trough. The upper trough was moving through ID and UT this morning per water vapor imagery. Strong q-vector convergence will affect the area into this evening as the trough moves E. Upper level ridging is in control over the region through the weekend.
Winds will increase today and shift towards the NW this evening into Friday morning as a cold front moves across the region. A dryline and cold front are expected to move into the area this evening with the cold front moving across the region tonight into Friday. Cooler air and breezy NW winds will occur behind the front leading to highs on Friday that are 20-25 degrees lower than today.
434 AM MST Thu Nov 17 2016 A mix of light snow showers and patches of freezing fog will be present through this morning. Snow showers remain possible for much of the Northern Rockies through this evening, however amounts will be well below one half inch for all but the highest mountain passes. Clearing skies tonight under developing high pressure will allow freezing fog to increase coverage and intensity. For locations that do not experience freezing fog on Friday morning, temperatures will drop to the teens and single digits.
Tonight into early tomorrow, the well-advertised cold front will approach and march across the forecast area. As the parent upper trough swings through Friday night, can't rule out the possibility of some light precip, thanks to moisture wrapping around the backside of the exiting low.
A cold front will approach from the west tonight, with low level moisture increasing ahead of it as it moves into the state. Upper ridge centered over the western Gulf of Mexico will shift eastward over the next 24 hours, which will allow the aforementioned frontal boundary to move down into the plains.
A passing cold front will deliver sharply colder temperatures today and Friday, likely the coldest so far this fall. Low temperatures tonight will fall well below freezing at most locations across northern Arizona. Dry and warmer weather will return for the weekend.
707 AM EST Thu Nov 17 2016 High pressure will prevail through late week.
A passing low pressure system will push a cold front across the area this morning resulting in cooler afternoon temperatures and local freezing conditions Friday morning.
618 AM EST Thu Nov 17 2016 High pressure for the remainder of the work week.
Very mild conditions will continue tonight as a developing cold front remains off to the west. Operational models remain in good agreement for the system tomorrow, dragging a cold front and showers and thunderstorms through Central Illinois. Ample warm air advection ahead of the boundary will contribute to the general instability of the air, but the ridging over the Gulf Coast remains in place, blocking off any significant moisture advection this far north. Behind the cold front, plenty of cold air will put the chill back into the region for the weekend.
A strong upper level storm system will approach the high plains today and then eject into the upper midwest by Friday. A cold front will slip southward through Garden City and Dodge City to the Oklahoma state line this morning system since the upper level system is still digging east-southeastward. This front will move back to the north as a warm front this afternoon as the upper level trough becomes negatively tilted and approaches the high plains. A north to south oriented front cold front will push eastward into western Kansas toward evening. How far north the warm front gets through 5 pm will determine fire weather conditions and strength/direction of low level winds.
An active period is in store for central Indiana with much above normal temperatures today and Friday giving way to a strong cold frontal passage Friday evening that will bring showers and chances for storms initially and then some chances for a few snowflakes during the weekend.
411 AM MST Thu Nov 17 2016 Upper level analysis has broad ridge over the eastern 2/3rds of the CONUS, with a high amplitude trof across the Great Basin area. At the surface, high pressure is located across Montana and North Dakota, with low pressure developing across northern Colorado. The upper trof looks to be a fairly quick mover, with snow ending from west to east by early Friday morning.
645 AM EST Thu Nov 17 2016 Warm and dry high pressure will hold over the region through Friday night.
Continued cooler but still near normal temperatures.
High pressure will continue to build into the region from the lower MS River valley through the short term and will keep things precipitation free. This high pressure ridge will also help warm things up Today and Friday with high temps expected in the 70s to near 80. High pressure builds into the area for the weekend with some of the coldest temps of the fall season in store. Temperatures will dip into the mid 20s over the mountains of NE GA Sat night and recovery only into the lower and mid 50s for Sun afternoon.
The windy conditions will continue tonight as the low level jet strengthens ahead of an approaching cold front. Isolated to scattered showers and perhaps a few thunderstorms will develop late tonight from west to east as moisture advection increases in association with the low level jet. A strong cold front will sweep across the area Friday as a sharp upper level trough moves into the central U.
Otherwise, MVFR ceilings returning after 18/06Z across area terminals ahead of an approaching cold front.
Given the recent overestimation of dewpoints in recent days northwest, even with the high-resolution models, have kept dewpoints slightly lower than the models would suggest. Winds will increase today and shift towards the NW this evening into Friday morning as a cold front moves across the region. A dryline and cold front are expected to move into the area this evening with the cold front moving across the region tonight into Friday. Cooler air and breezy NW winds will occur behind the front leading to highs on Friday that are 20-25 degrees lower than today.
820 AM CST Thu Nov 17 2016 Temp trends thus far have rebounded nicely from their earlier lows ranging from the upper 30s to the mid 40s now to predom the lower/mid 50s for most areas. With high pressure at the sfc/aloft dominating the wx pattern across the SE states, temps will continue to easily climb into the upper 70s/near 80F this afternoon under mainly sunny skies. A deep upper trough in the upper midwest makes its way east on Friday with a trailing cold front that should be near the AR/MS line by 18-21z. Temps will be similar to today, maybe a deg cooler, as clouds start to move in.
High pressure will return to the interior west Friday and remain over the area through the weekend.
1006 AM EST Thu Nov 17 2016 The 12Z OHX sounding shows significant warming in the 950-700 mb layer over the past 24 hours, which should result in high temperatuers several degrees warmer than yesterday.
Upper trough has moved into the four corners and continues to move quickly to the east attm. NW flow with near normal temps for today will give way to a gradual warming trend for Friday as a weak upper ridge builds in over the area.
402 AM MST Thu Nov 17 2016 Strong cold front stretching from Lake Powell northeast to Craig will continue to move slowly eastward this morning. Have backed off the higher end of the snowfall accumulation for our mountains by an inch or two, but still expect significant travel impacts in our CWA. Coldest night of the season anticipated tonight for just about the entire forecast area and freeze warnings already issued for the few valleys that managed to escape the freezing weather so far this fall. That will come to an end tonight and again Friday night with temps down into the teens and 20s with some single digit readings anticipated for the higher valleys.
Winds are then more variable aloft since the 585 dm ridge axis is overhead. High pressure will remain in place today as temperatures climb into the lower 80s.
Breezy southerly winds this morning become gusty across Eastern Oklahoma and Northwest Arkansas by mid morning and remain gusty through the TAF period as a cold front approaches and enters into the region.
The large scale pattern across the CONUS will feature a large trough of low pressure moving slowly eastward across the central and northern plains, and a large sprawling ridge of high pressure moving slowly across the Gulf Coast. This ridge extends northward well into the Tennessee and Ohio valley regions and New England. This ridge will be our primary weather maker today through Friday. Southwest flow will be on the increase Friday evening downstream of the approaching upper trough and attendant cold front set to blast through eastern North America.
955 AM EST Thu Nov 17 2016 Warm and dry high pressure will hold over the region through Friday night.
Cool temperatures will prevail across the region today as an upper level trough gradually translates eastward. As the trough axis moves downstream of eastern Montana expect rising heights in advance of a building upper ridge over the Pacific shore. This ridge will become more established over the area by the beginning of the weekend.
Rising 500 mb heights Sunday foretell warmer and dry conditions.
803 PM EDT SAT JUL 23 2016 Upper level ridge will allow for continued hot and humid conditions through the weekend.
We have seen a few strong wind gusts around 40-50 MPH due to the high based nature of this convection; however, believe that threat will diminish after sunset with higher T/Td spreads. Afternoon water vapor loop showed the CWA between a upper trough moving across the northern Rockies and another lifting northeast across the northern Great Plains/Upper Midwest.
/issued 704 PM CDT SAT JUL 23 2016/ VFR conditions and light to moderate south winds will persist under high pressure. Similar conditions are expected tomorrow with the mid to upper ridge axis remaining overhead. A cold front, however, will start to nudge into southwest KS during the late afternoon and early evening hours.
The best opportunity for rainfall will occur over the higher terrain north and east of Phoenix with lesser chances heading west into southeast California. A well defined MCV continue to churn westwards across the Baja peninsula while a subtropical anti-cyclone remains centered over cntrl/ern New Mexico. An inverted trof, weakly seen in south Texas this morning, is modeled to move northwestward an approach southeast AZ later Sunday evening.
So far all is quiet however still have upper wave tracking across S MB, cold front through the western FA along with modest cape and instability. HRRR continues to hint at development along cold front over SE ND and adjacent west central MN where cape highest and still a possibility so will continue to monitor closely. The upstream cold front has moved into central ND, with some gusty west-nw winds behind it. Main question remains whether any convection can fire between the departing convection over the NE FA and the eastward advancing cold front. Nice drying is evident on water vapor imagery moving into eastern ND, however there are some MVFR ceilings along the cold front. So there will be SCT-BKN clouds around until the cold front passes, then skies should clear.
Lows will be cooler tonight than last night by several degrees. Templer Previous Discussion: Synoptic Setup: A large high pressure heat dome lies over the southwestern quadrant of the CONUS while zonal flow runs through the Pacific Northwest, Montana, and southwest Canada. A closed low currently resides in the flow over southern Saskatchewan. Today through Tonight: The closed low to the north is currently moving off to the east and allowing some wrap around precipitation to drop south. A pressure gradient has also formed behind the low and when combined with the daytime mixing has allowed for wind gusts that are a little bit higher than predicted.
As the zone of high pressure over the central Plains has moved back toward the Western US, 500mb, 700mb, and 850mb temperature and heights are not breaking records, but still well above normal. Winds have also responded to the lessening influence of the high pressure with winds above 700mb from the northeast.
732 PM EDT SAT JUL 23 2016 A cold front will will push offshore tonight with scattered thunderstorms ahead of the front. High pressure will build in from the west on Sunday and will shift offshore Sunday night.