Aikyam-Lab/Synoptic-Bench huggingface dataset:
/DC/ The region is situated between the longwave trough and cold front over the Rockies and upper low spinning over the Florida panhandle. Mostly quiet afternoon is expected as upper high is parked over the mid-Mississippi Valley with surface ridging in the region. Another hot and humid afternoon is expected as low level boundary layer temperatures have remained near the same as yesterday, with even just slightly warmer at 925mb. Dewpoints should mix out enough again in the low to mid 60s to preclude any issues with heat but could not rule out some heat indices peaking around 100 degrees.
1012 AM EDT Sat Sep 24 2016 High pressure will maintain dry weather and seasonal temperature for the weekend. Cold front is completing passage across the Upper Ohio Region. Subsidence and dry advection with building high pressure will erode clouds as the afternoon progresses.
441 AM PDT Sat Sep 24 2016 High pressure will bring warm and dry weather to the Inland Northwest this weekend.
1033 AM EDT Sat Sep 24 2016 Canadian high pressure builds over the Tri-State through the weekend with our first touch of fall-like weather.
Forcing for ascent remains well focused along a steep isentropic response along the leading edge of the deep 500mb trough over the Rockies and ahead of the frontal boundary. Additional storms will form later tonight in northern Oklahoma as a cold front moves across the area. /issued 315 AM CDT SAT SEP 24 2016/ Part of a strong western trough/low will move across the northern Rockies and Plains today. Meanwhile, the trough moving across the northern Plains will continue east into the Great Lakes region. This will help push a cold front across Oklahoma and north Texas.
747 AM EDT Sat Sep 24 2016 Cold front arrives from the north today, moving south into the Carolinas Sunday, before stalling.
1208 PM EDT Sat Sep 24 2016 A large area of high pressure near James Bay Canada will drift south and becoming centered over the northeastern states on Sunday.
950 AM EDT Sat Sep 24 2016 Weak high pressure will extend over the area from the west today.
No POPs have been mentioned remaining sites as ridging aloft should maintain enough capping to limit convection today. Aloft a ridge remains in place, however it is centered over the NE gulf coast and is gradually weakening.
We could see some heavy rainfall across the region overnight, as an area of widespread rain and embedded thunderstorms moves eastward ahead of the cold front that will move in on Sunday. There may be a bit of a break in the precipitation behind the cold front, but showers will quickly move in as the day wears on.
518 AM MDT SAT SEP 24 2016 Upper low is now centered over southern Wyoming, with leading edge of forcing (associated with jet streak) over western Nebraska/Kansas. Subsidence/deep dry air is building eastward around the southern part of upper low into our western CWA. At the surface a cold front is already moving towards the Colorado border and should be through our CWA by sunrise. Today-Sunday: As upper low continues to shift towards the northern plains large scale subsides as a result of ridging in the west will spread eastward.
759 AM EDT SAT SEP 24 2016 Slightly drier air will filter into the area for today as an upper-level ridge builds over the region.
753 AM EDT Sat Sep 24 2016 Canadian high pressure builds over the Tri-State through the weekend with our first touch of fall-like weather.
1112 AM CDT SAT SEP 24 2016 Low pressure center is moving into southwest ND with frontal boundary pushing into central SD. Threat remains for a few stronger storms capable of gusty winds, and cannot rule out an isolated weak tornado somewhere across eastern SD into west central MN given the high shear environment. This will allow showers and thunderstorms to develop this afternoon along a cold front moving over our eastern counties.
743 AM EDT SAT SEP 24 2016 Aviation High pressure north of Lake Huron will provide fair weather today and through most of Sunday.
1047 AM EDT Sat Sep 24 2016 Canadian high pressure builds over the Tri-State through the weekend with our first touch of fall-like weather.
with a dominant high pressure ridge in place directly over the region. record highs may be set or tied at Knoxville and Chattanooga as temperatures will reach the low to perhaps mid 90s once again. Strong subsidence from this upper-level ridge will prohibit convection from forming in the afternoon. Chattanooga Airport, TN 94 67 93 68 / 0 0 10 10 Knoxville McGhee Tyson Airport, TN 92 64 90 67 / 0 0 10 10 Oak Ridge, TN 92 63 90 67 / 0 0 10 10 Tri Cities Airport, TN 90 60 87 63 / 0 0 10 10.
251 PM EST Fri Jan 13 2017 Downstream ridge amplification over the Great Lakes and energy pivoting across central Canada will tighten the resident mass gradient and support a stationary upper jet well into the weekend.
125 PM PST Fri Jan 13 2017 A low pressure system over Southern California will move int Baja California tonight.
High pressure will then build across the region through the weekend. Adjusted the pops to carry 40% across the crown of Aroostook County into mid afternoon as upper trof is moving across the region. High pressure will build east toward the region later tonight. High temperatures will occur early today ranging through the 20s to lower 30s north, with upper 30s Bangor and interior Downeast with around 40 to the lower 40s along the Downeast coast. High pressure will crest over the area Saturday then move to the east. A weak area of low pressure will approach from the west and move to the north of the state Saturday night and bring some snow showers.
Average sfc-500 flow around an upper ridge over the Gulf of Mexico is bringing moisture northward into the mid-Mississippi and Ohio Valleys. Waves of precipitation will continue to break out along the periphery of the ridge north of a surface boundary stretching from the central Appalachians to the Tennessee Valley and Red River Valley. As temperatures tumble toward the freezing mark Saturday night, there is a non-zero but small chance of some light freezing rain in Indiana north of a Paoli-Madison line.
Have removed prevailing wx mention for KAMA for the start of the TAF period but we could see some light freezing drizzle between 19z and 21z. After 21z we should see more consistent drizzle as we should be above freezing at the surface. After midnight, we should see drizzle switch over to freezing drizzle which will also drop our ceilings to LIFR. Given temperatures will be well below freezing precip should be in the form of freezing drizzle.
1157 AM EST Fri Jan 13 2017 With a large area of high pressure building into the area, expect generally VFR conditions with just a FEW-SCT stratus this afternoon near 2500 feet. Winds under 10 knots will veer from N to NE with approach of the high and then become light/variable tonight. The upper wave now rotating into northern Quebec drove arctic air across the Great Lakes region yesterday afternoon through last night and forced the low level moisture gradient well south of the state. Fairly stable mid levels and the brief nature of the forcing (not to mention the dry arctic air in the low levels) will support just a slight chance for some light snow late tonight into Sat morning with this feature.
A rather impressive thermal gradient in place today with subfreezing temperatures noted as far south as the Ozarks and Ohio River while just south of the boundary temperatures are in the middle 60s. The stagnant front may then begin to lift to the n as a warm front on Sat, with any low chance for rain mainly confined for areas along/n of the TN River during the afternoon hrs. After a relatively quiet and mild Sat night, both the sfc and upper ridge patterns in place over the SE region look to become better entrenched on Sun, with slight rain chances confined mainly to the srn mid TN counties in closer proximity to the weak frontal boundary. A semi cutoff low and deep trough extending north-south from the central Rockies to northern Mexico and West Texas border will begin moving further eastward.
259 PM EST Fri Jan 13 2017 High pressure will build in from the west tonight and Saturday.
250 PM MST Fri Jan 13 2017 Latest satellite and upper air analysis indicates the closed low just off the west coast of California near the Mexican border. Downstream from the closed low the flow as zonal. There will be some WAA occurring tonight ahead of the upcoming ice storm, so lows will be a few degrees warmer than last night. Expect freezing rain and wintry mix to begin early to mid-afternoon for areas south of the the KS/NE border with the best chances south of a Goodland to Hill City line. As we go through the overnight, freezing rain and sleet chances spread northward and encompass our entire CWA.
With high pressure in place and calm winds the only issue tonight will be fog. Lows tonight will be mild and will range from the upper 40s near Albany to the lower 50s at the coast.
247 PM MST Fri Jan 13 2017 Upper low over Southern California Coast with a continued southwest flow aloft over Colorado.
High pressure will build into the area through midnight tonight.
Quiet weather can be expected through the weekend as the area will be situated under somewhat of a split flow aloft with ridging over the West and an upper low over the Desert Southwest.
Fog will form in the lower valleys again overnight causing MVFR/IFR conditions. As the inversion gets stronger and shallower the fog should eventually find its way to the lower Treasure Valley.
Also, early this morning any chance of freezing drizzle or light rain over far northern AR. On the surface map, the cold front has made some progress south and was currently just south of Pine Bluff to just south of Arkadelphia. Cooler temperatures with a north to northeast wind will be seen, but still a bit above normal for central, while still well above normal over southern areas. The slight chance of freezing precip over far northern AR still exists, but only for a few hours before temperatures come above freezing.
246 PM CST Fri Jan 13 2017 The cold front that passed through the mid state last night into the early morning hours this morning has stalled near the AL border. Some of the cold air even stalled along the Plateau since some of the higher elevation locations are in the upper 50s, and areas still being impacted by the cold air are in the 40s. The good news is that as the next trough approaches the region, WAA will return and push the cold air back northward, and bring above average temps back to the mid state starting tomorrow.
Periods of rain and freezing rain will affect the area through Saturday. As long as the echoes remain scattered, it may keep a widespread area, at least initially, from wet-bulbing down below freezing where temps currently are above 32 degrees. Although still think as we go through the morning hours much of the the area under the advisory/warning will drop to or below the freezing mark with icing becoming a problem. As we go through the day on Saturday, models still show some warming and the freezing line beginning to retreat back to the north and west. The freezing line looks to be north of the interstate 40 corridor by late in the day. Much of northern/northwestern Oklahoma will remain at or just below freezing with some ice accumulations continuing.
251 PM EST Fri Jan 13 2017 Downstream ridge amplification over the Great Lakes and energy pivoting across central Canada will tighten the resident mass gradient an support a stationary upper jet well into the weekend.
Fog in the lower valleys will burn off between 18- 20Z then form once again Saturday morning. As the inversion gets stronger and shallower the fog should eventually find its way to the lower Treasure Valley.
937 AM MST Fri Jan 13 2017 Considerable high level moisture continues to stream in from the Southwest from the upper low over Southern California. This has been slow to dissipate due to the higher cloud cover. Temperatures today a little cooler than normal with varying amounts of high cloudiness in the 500-300 mb layer moving over the region ahead of the developing storm system over southern California. The upper level low that will affect the region will move across the Baja Peninsula Saturday and across northern Mexico Saturday night.
145 PM EST Fri Jan 13 2017 Hydro A large area of high pressure centered over the Upper Mississippi Valley will build eastward into the Great Lakes Region today and tonight. With high pressure mostly in control of our weather in the short term. One wave of low pressure pulls out of the Central Rockies today and weakens as it moves into confluent flow aloft.
332 PM CST Fri Jan 13 2017 Will keep the dry forecast going for north central Nebraska as a ridge continues to build across the western Plains. Will see slightly cooler temperatures across the Pine Ridge region where temperatures could drop into the single digits. A closed upper low will cross just south of Arizona Saturday night as an upper ridge extends from the southeastern U.
350 PM CST Fri Jan 13 2017 Surface observations early this afternoon revealed temps above freezing everywhere except generally north of the Highway 70 corridor. No additional CAA or drying of the sub-cloud layer is foreseen, so chances of freezing rain falling too far outside our advisory appear very slim. A strong SE low level jet tonight with deep moisture will help thicken our current shallow stratus layer to several thousand feet, likely resulting in some light rain showers at times, with spotty ice accumulations finally gaining traction in our freezing rain advisory counties. Should this weak Fn layer verify, there is concern for precip to become displaced west of the freezing surface temps likely to reside in the far southeast Panhandle and nearby counties.
115 PM EST Fri Jan 13 2017 Aviation A large area of high pressure centered over the Upper Mississippi Valley will build eastward into the Great Lakes Region today and tonight. With high pressure mostly in control of our weather in the short term. One wave of low pressure pulls out of the Central Rockies today and weakens as it moves into confluent flow aloft.
An upper level low will continue to move south along the coast today moving eastward along the Mexico and Arizona border Saturday. In the wake of this low, a drying trend will follow into the weekend. A slow moving upper level low is currently located along the California Coast. As upper level ridging amplifies over the eastern Pacific, this upper level low will transition to a more easterly motion and cross northern Mexico near the US border Saturday. A lull in the weather is expected as ridging builds into the West.
The ongoing Wind Chill Advisory is marginal as winds are dying off with the approach of the low-level anticyclone.
High pressure to the north will provide a source for cold air flowing into the area. With warm temperatures aloft and initially cold temperatures at the surface, precipitation type could start out as freezing rain south. Feel that the threat for freezing rain today across the south is too low to change the start time of the Advisory.
Cannot rule out some lingering freezing drizzle in the wake of the NE moving precip area. Temps should be above freezing nearly all areas by shortly after dark.
307 PM CST Fri Jan 13 2017 Afternoon water vapor imagery detected a digging upper low off the southern CA. This moisture along with broad low-level warm air advection has resulted in periods of light freezing rain/drizzle throughout the afternoon. with a few lightning strikes noted with the batch of freezing rain currently moving through western Osage county. The freezing line hasn't budged much today. the ECMWF and higher-res NAM models continue to have a better handle on the low-level temperatures as were once again followed very closely for this forecast. With the freezing line expected to remain nearly quasi-stationary overnight. Will not make any changes to the current Ice Storm warning and Freezing Rain advisory. The freezing line is expected to retreat a bit northwest on Saturday.
A weak but persistent coastal trough offshore of the local coast will bring waves of low level clouds across NE Florida through the night which will disrupt widespread fog development. Low temperatures will range in the 50s tonight with upper 40s possible across some of our normally cooler inland locations across SE GA tonight. Based on afternoon satellite trends and forecast decoupling under low level ridge across SE GA. Elevated boundary layer easterly winds and passing low clouds courtesy of low level coastal trough expected to bring less than ideal widespread dense fog development conditions south of the I-10 corridor tonight.
The low pressure system and associated south to north oriented moisture band is the cause of all this weather. The focus for the short term is a closed low moving south just off the California coast. roughly between the low center and jet streak on eastern side of the low.
335 PM CST Fri Jan 13 2017 Surface observations early this afternoon revealed temps above freezing everywhere except generally north of the Highway 70 corridor. No additional CAA or drying of the sub-cloud layer is foreseen, so chances of freezing rain falling too far outside our advisory appear very slim. A strong SE low level jet tonight with deep moisture will help thicken our current shallow stratus layer to several thousand feet, likely resulting in some light rain showers at times, with spotty ice accumulations finally gaining traction in our freezing rain advisory counties. Should this weak Fn layer verify, there is concern for precip to become displaced west of the freezing surface temps likely to reside in the far southeast Panhandle and nearby counties.
1244 PM EST Fri Jan 13 2017 High pressure, to the north, will keep the wind out of the east through the TAF period. Scattered showers have been moving inland overnight along the east coast due to a weak inverted trough and surge of enhanced moisture moving through the easterlies.
Will also go on the high side of most MAV temps for the short term period, with the springlike warmth continuing.
The boundary of the shallow cold front has progressed very slowly southward this afternoon as evident off GRK radar and area surface observations.
Meanwhile those who break out of the low stratus will see some warming during the peak afternoon sun, likely followed by redeveloping low clouds and freezing fog overnight which should effectively limit overnight cooling.
500 PM EST Fri Jan 13 2017 High pressure will dominate through the long holiday weekend resulting in fair weather with seasonable temperatures. Ridging will build in at the surface tonight as the flow aloft becomes zonal. The brisk and gusty winds will decrease this evening and become light overnight as pressure gradient weakens as the ridge builds in.
Best chances of seeing a few drops remains across the western valley this afternoon and evening focused with the strongest portion of the low level jet, but shifts more toward the coast overnight as streamer showers pop up to the southeast.
The upper ridge continues to dominate over the Florida Peninsula, which has helped to stall the surface front that's stretching from northern Texas northeastward into Central Tennessee. Mild temperatures are expected once again tonight, but maybe a tad cooler than last night due to less in the way of cloud cover expected. The ridge will decrease the southerly surface flow and isentropic lift that has been helping to develop the lower clouds and light showers that we've seen over the past couple of days. Low temperatures ranging from the low to mid 50s can be expected.
825 AM PST Fri Jan 13 2017 A low pressure system will move through Southern California today and into Baja California tonight.
345 PM CST Fri Jan 13 2017 Stalled cold front remains just along the wrn and nrn CWA boundaries of E TX/SE OK/SW AR this afternoon. The front is fcst to begin to move back nwd tonight as low pressure in the plains deepens.
417 AM EDT Wed Mar 22 2017 A cooler and drier air mass will settle over the area today and Thursday. Showers have moved east of the area at 08z as low pressure area moves toward the coast. Expect decreasing cloudiness by this afternoon as ridge builds southeast from the Ohio Valley and Great Lakes region. Air mass will be about 15 degrees cooler than yesterday. Boundary layer winds stay up so expect mixing overnight and temperatures will stay above freezing. Raised temperatures a category although it may be even warmer.
A weak high pressure cell has settled just north of the service area as expected. Meanwhile, an intensifying continental polar anticyclone centered just north of the Great Lakes is poised to expand rapidly southward during the next 48 hours.
648 AM EDT Wed Mar 22 2017 A cooler and drier air mass will settle over the area today and Thursday. Showers have moved east of the area at 08z as low pressure area moves toward the coast. Expect decreasing cloudiness by this afternoon as ridge builds southeast from the Ohio Valley and Great Lakes region. Air mass will be about 15 degrees cooler than yesterday. Boundary layer winds stay up so expect mixing overnight and temperatures will stay above freezing. Raised temperatures a category although it may be even warmer.
Warm front located across central Wyoming into western Montana with warm air aloft already showing up in the Black Hills. Some light rain/freezing rain across south central South Dakota. Warm front moves into central Dakotas today with building upper level ridge. Western CONUS trof moves into the Rockies late tonight and then into the plains Thursday. As trof closes off over the central plains Thursday night, rain will shift towards Nebraska border.
This system will also bring gusty winds this afternoon and evening followed by much cooler temperatures Thursday.
359 AM CDT Wed Mar 22 2017 Satellite imagery this morning shows an amplifying ridge transiting into the Plains ahead of a large East Pacific trough that is starting to to make landfall over the West Coast. The West Coast trough will be a driving factor in the weather through the rest of the work week and weekend. the West Coast trough will keep warm air advection prevailing across the Southern and Central Plains through the next 24 hours. showers, or drizzle, that may have started before sunrise, will likely move north through the day as a warm front lifts across the region ahead of the West Coast trough that will be digging into the Four Corners region. With the warm front moving north of Missouri Thursday afternoon, focus for precipitation will go with it, leaving Thursday night dry.
409 AM EDT Wed Mar 22 2017 High pressure will expand over the Great Lakes today providing dry but rather cold conditions through tonight. A warm front will approach and move through Thursday night with showers and warming temperatures.
This will combine with lifting warm front to bring above average temperatures to the region. Right now looks like this warm front will be dry here in the eastern side of the state Thursday night. All eyes then turn to the Rockies for already developed upper level closed low and nearly vertically stacked system.
This ridge will be set up across MN by 06Z Wednesday, while a sizable 500mb ridge of high pressure builds in from MT and sets up across the northern and central plains by mid morning Wednesday. Models still in a bit of disagreement in regards to precip chances Wednesday night through Thursday as a frontal boundary tries to become established across the region in response to deepening low pressure over the CO region.
652 AM EDT Wed Mar 22 2017 A cold front will push slowly southward through the area today. Cold high pressure will build into the region from the north this afternoon through Thursday. Warmer conditions will arrive this weekend as the high shifts well off in the Atlantic. The main cold front will surge into central NC late morning. Yet, the actual lows should dip to freezing for several hours regardless. Lows Thursday night will again flirt with freezing in the south and likely fall into the upper 20s and lower 30s again across the north. coast, with mid level ridging moving across the area from west to east.