Aikyam-Lab/Synoptic-Bench huggingface dataset:
344 AM MST Tue Dec 12 2017 High amplitude upper level pattern remains in place across NOAM with a Western States ridge transitioning to a deep trough across the East. This lead wave will have little impact to our region but it pull along some high level moisture over the ridge going into Wednesday. This wave will push mid level temperatures down a bit by tomorrow afternoon so slightly cooler in the northern CWA due to this and some cloud cover.
1016 AM EST Tue Dec 12 2017 An alberta clipper will track over northwestern PA early today with a trailing arctic cold front sweeping through the area during the mid to late morning afternoon.
A cold front will push through the region from northwest to southeast later this morning and early afternoon. A dry cold front will rapidly move through the local area from northwest to southeast this morning and early afternoon.
647 AM EST Tue Dec 12 2017 Dry cold front will cross the forecast area late this morning with high pressure and reinforcing cold air moving into the region this afternoon and tonight.
540 AM CST Tue Dec 12 2017 Updated for 12Z aviation discussion 12Z TAF discussion: A cold front made its way through the area last night. The accompanied dry cold front continues to make its way through the area this morning. Northerly winds will usher in cooler and drier air today. Highs in the 50s today will be about 10-15 degrees cooler than yesterday.
The accompanied dry cold front continues to make its way through the area this morning. Northerly winds will usher in cooler and drier air today. Highs in the 50s today will be about 10-15 degrees cooler than yesterday.
Weak high pressure building over the Peninsula from the Gulf of Mexico will allow low-level winds to shift more southerly today, beginning the trend of increasing moisture and warmer temperatures that will continue into the weekend. Mostly clear skies tonight but rising dew points in the S-SW low level flow will help hold min temperatures in the low/mid 60s. Flow will become southeasterly 10-15 kt near the coast this afternoon with ridge axis building in and sea breeze circulation setting up near the coast.
This flow will exist within modest pressure gradient between high pressure to the east and low pressure lifting into the Mid Mississippi Valley. Deep trough has carved out over much of the western and central US with a steady feed of strong westerlies feeding energy into it. The wave then lifts through the area to become absorbed by the dominate upper level low pulling a cold front through lower MI Thursday afternoon. Strong southerly flow today ahead of the trough with low level jet around 40 knots will create good WAA into the region. The cold front will occur around 21Z with the bulk of the precipitation likely occuring between 16Z and 22Z.
Sfc temps still at or just below freezing so mentions of FZRA still in the grids although may need to adjust Max Wetbulb aloft to generate more snow in wx grids if current trends continue. Mixed precip will continue to switch over this morning as warm temps aloft fall below freezing which occurred early this morning at BJI. Went ahead and added OT and Wadena counties for accumulating mix of freezing rain and ice this morning. Will need to monitor trends under the highest reflectivities to see how the forecast can be improved/updated.
This is the area that is along or just ahead of a slow moving cold front. Light winds/clearing skies will allow temperatures to fall off into the lower 30s in a few areas across far northeast Oklahoma. Scattered showers/isolated thunderstorms still possible late Thursday afternoon into the overnight hours in association with main upper trough axis.
Precipitation will diminish from west to east this evening with cool northwesterly flow developing in the wake of the trough passage. A cold front will sweep through the area today, arriving to eastern Oregon this morning and then clearing much of the forecast area by the early evening hours. As this cold front advances, shower activity will spread across the area. Higher amounts expected in the mountains, with close to an inch possible over the highest terrain.
A strong upper-level trough will take a swipe at the region late tonight as the trough base swings from the Ark-La-Tex toward the Ohio Valley. The 500mb trough axis is now expected to flatten as the strongest forcing brushes by to our northwest. This type of trough evolution along with 500mb winds becoming more westerly, will be favorable for the QLCS to transition into a broken line of bowing segments and supercells as it moves across the CWA.
555 AM MDT Wed Apr 26 2017 After a period of warm weather and the emergence of new spring vegetation across the area, temperatures around freezing are expected again after midnight tonight through the early morning hours on Thursday. With a period of mostly clear skies and light winds after sunset, expect temperatures in the lower to mid 30s overnight with areas of frost developing.
Once this system passes, expect clear and warmer conditions through the weekend. A cold front will move through the area this morning. Conditions there will begin to improve after the cold frontal passage around 15Z, but a mix IFR and MVFR with lighter showers is still expected through Wednesday afternoon.
747 AM EDT Wed Apr 26 2017 A low pressure area at the surface and aloft along the mid Atlantic coast will drift slowly northeast today and be near Cape Cod tonight. A ridge of high pressure will build northward from the mid Atlantic states northward into northern New York this afternoon. A ridge of high pressure will be over the North Country on Thursday, with highs in the 70s to the lower 80s. Expecting the showers to taper off this afternoon as a ridge of high pressure aloft builds northward into northern New York this afternoon. A ridge of high pressure will be over the region on Thursday with highs mainly in the 70s to lower 80s.
/issued 417 AM CDT Wed Apr 26 2017/ Biggest issue in the short term is the approaching cold front which will move through the area late this afternoon into this evening bringing scattered to numerous showers and thunderstorms. Behind the front a brief reprieve with slightly cooler and drier air filtering into the region Thursday. High pressure quickly scoots off to the east though veering winds back to the south and ushering in much warmer temperatures and dewpoints.
652 AM CDT Wed Apr 26 2017 Light snow or flurries over western Nebraska early this morning are expected to end by sunrise as the upper closed low over the Dakotas shifts east.
858 AM EDT Wed Apr 26 2017 The CONUS has bookend low pressure systems with one over the Upper Mississippi Valley, and the other just of the Delaware coast. High pressure is parked over South Florida and the Florida Keys this morning. The tail end of the boundary attached to the low of the DELMARVA is the most unstable area within the Key West radar range this morning. Winds are currently east to southeast 5 to 10 knots at the island terminals and the marine stations east of the Seven Mile Bridge, and near 10 knots at the marine stations west of the Seven Mile Bridge. Winds will gradually increase through Thursday night as a trough moves out of the Colorado Front Range.
With upper trough over Alberta/Sask, showers are expected to develop over central Montana and move into the western zones late today. TFJ Broad upper trof over the Front Range and High Plains expected to remain in place through the end of the week.
1055 AM EDT Wed Apr 26 2017 High pressure will prevail across the region today and tonight.
945 AM PDT Wed Apr 26 2017 A trough moving across the Great Basin will bring gusty northwest winds to the mountains and deserts this afternoon and tonight.
Models showed this low level wind field gradually decreasing through the afternoon along with advection of cooler air in the low levels. With weak cold air advection in the lower levels, expect high temperatures will fall slightly below 100 degrees out west. It will be as warm or slightly warmer over the southern Coastal Bend as downslope warming helps readings get close to 100 degrees. Will likely need to issue another SCA this afternoon to cover the Gulf waters as winds increase behind the cold front tonight.
929 AM EDT Wed Apr 26 2017 High pressure over the Atlantic will build in this afternoon through the weekend bringing above normal temperatures and below normal rain chances.
600 AM MDT Wed Apr 26 2017 Upper level analysis has large trof over the central CONUS with weakening closed low over the Dakotas. At the surface, Canadian high pressure has moved into western areas with boundary layer winds out of the north to northwest at 10 to 20 mph.
Chattanooga Airport, TN 82 63 77 55 / 0 30 60 10 Knoxville McGhee Tyson Airport, TN 84 62 79 56 / 0 10 60 10 Oak Ridge, TN 84 63 76 53 / 0 10 60 10 Tri Cities Airport, TN 81 56 79 53 / 0 0 50 20.
Although MLCAPE will be on the low side at around 500 J/Kg, very intense low level and deep layer shear may allow for some damaging winds and possibly even a QLCS tornado with the line before it diminishes significantly by 12Z. Still, cooler temperatures are expected on Thursday and Thursday night in the wake of this system with highs in the 70s and lows down into the 50s.
818 AM EDT Wed Apr 26 2017 Fair and warmer today as high pressure ridges into the region.
706 AM EDT Wed Apr 26 2017 Col between systems gives way to southerly flow today, ahead of a cold front that will weaken as it crosses Thursday night.
624 AM CDT Wed Apr 26 2017 Yesterday's cold front, currently along a line from Kirksville to Butler MO, has shifted winds to the northwest and is ushering in cooler temperatures. Post-frontal showers, mainly south and east of I-35, are expected to linger for most of the day as the upper-level trough moves through. Thursday evening, on and off rain chances return as a broad upper-level trough begins to deepen and send energy pulses over the area. At the surface, a low pressure system will be taking shape, advecting warmer air and moisture into the area.
1014 AM CDT Wed Apr 26 2017 Cold front moved through the rest of the fa earlier this morning. Cooler today with high temperatures 15-25 degrees colder than yesterday.
Otherwise, we did increase the mention of light freezing rain on the northwest side of the precipitation shield from Jamestown to Ashley this morning based on early DOT reports and a lack of deep- layer saturation into the ice crystal production zone in forecast soundings on the fringe of the stronger synoptic-scale forcing. First, freezing rain is possible early this morning before the column becomes completely saturated. Second, as temperatures rise this afternoon snow may mix with rain and surface temperatures may rise briefly above freezing.
High pressure will bring warm days and dry weather through Friday.
A surface trof of low pressure is forecast to slide into nrn sections of the area late this afternoon with winds becoming northwest to north at KGUY and KDHT. /Issued 339 AM CST Thu Mar 8 2018/ Ridging over the western CONUS and troughing in the east with a closed low over the Great Lakes has the Panhandles in northwest flow today. Low level lee side troughing will allow us to see 70s over the next few days. The next big wave comes onshore in the Pac NW on Friday and it starts to dampen the ridging.
Surface analysis this morning places a 1026 mb ridge of high pressure over the Southern Plains. This is resulting in clear skies across the Mid South with temperatures as of 3 AM CST in the lower to middle 30s at most locations. Northwest flow aloft will persist across the Lower Mississippi Valley into tonight while a ridge of high pressure will remain in place across the region into Friday. This will result in continued below normal temperatures but slightly warmer than yesterday. Southerly winds on the backside of high pressure will result in temperatures moderating back into the upper 50s to middle 60s on Friday.
The persistent cyclone over New England will cause snow showers over our forecast area through Friday.
Cool high pressure will begin to build in from the lower Miss Valley providing a breezy northwest flow of unseasonably cool and dry air. will allow for afternoon temps to reach the lower 60s across Ne Fl and near 60 degrees across Se Ga. Warmer conditions Friday with dry air will result in critically low RHs but winds will be lighter.
305 AM MST Thu Mar 8 2018 Periodic thick high clouds will continue to affect the region this week despite high pressure locked in place.
340 AM MST Thu Mar 8 2018 On an otherwise benign, yet cold, morning across the region a few isolated spots of haze or mist or patchy freezing fog seem possible along the lower Milk River and Missouri River valley through NE Montana. SREF model data also indicate the chance for some freezing rain on the backside of this snow.
Winds increase tonight through Friday morning with another round of showers likely to accompany a cold front passing through the region late Friday and Friday night. Upper level low just off the Pacific NW coast early this morning opens up and rapidly weakens while moving inland and flattening the upper level ridge over the Northern Rockies and MT today.
Impacts to roads may be limited as road surface temperatures are forecast to remain at or above the freezing mark through the night. A cold front will push through the region Friday. Cooler and unstable air will produce scattered valley rain and mountain snow showers Friday afternoon and evening.
In the low levels of the atmosphere, an area of high pressure over Louisiana will build southeastward across the Gulf of Mexico this afternoon. In the mid to upper levels of the atmosphere, a trough of low pressure will pass eastward over the Florida peninsula today.
Ground temperatures remain above freezing and should allow for trace snow accumulations to be limited to cars and elevated surfaces. As the high slides east another weak upper impulse will bring a chance of light showers Friday afternoon and evening. Meanwhile, a developing low pressure system will move from the Texas panhandle toward the lower Mississippi Valley. Models are differing on the placement of the low as it approaches our area.
535 AM CST Thu Mar 8 2018 135 AM CST Another day of seasonally cold weather will be on tap today, courtesy of deep low pressure across the eastern Great Lakes region. Energy will continue to rotate southwestward across the area as the low slowly pulls off to the east. Flurries are a possibility too, though later today we lose some of the ice production in the clouds as the lower level column warms slightly so we don't anticipate much.
644 AM MST Thu Mar 8 2018 640 AM Update: Sent an update early this morning to bring in the latest observed low temperatures - several of which showed colder readings than expected - and to include a few areas of patchy freezing fog possible near Wolf Point, Poplar, and Plentywood, based on observations and reports. BMickelson Previous discussion: On an otherwise benign, yet cold, morning across the region a few isolated spots of haze or mist or patchy freezing fog seem possible along the lower Milk River and Missouri River valley through NE Montana. SREF model data also indicate the chance for some freezing rain on the backside of this snow.
557 AM CST Thu Mar 8 2018 High pressure and VFR conditions will continue through the period.
This complex could produce another coating of snow for the same areas which saw some snow a bit earlier as it enhances as it moves across the higher terrain. We should see one more burst of more intense snow showers with the passage of this trough between 8 am and noon. Will continue to go below guidance with highs today with readings in the low to mid 30s and above guidance for tonight as some winds remain through most of the night. As a baroclinic zone sets up on Friday, a warm front will develop and spread northeast into Kentucky late Friday.
610 AM EST Thu Mar 8 2018 Low pressure continues to spin over the Great Lakes, and the primary upper trough is over the lower Ohio Valley early this morning. One notable mid-level vortmax was diving southeast through western TN, around the base of the trough. In the low levels, moisture depth remains fairly limited. With temperatures slowly trending a bit cooler over the next few hours, some slick roads will be possible during the morning commute. Lows in the low to mid 20s are likely Friday morning. After a dry morning, rain is likely to develop Friday afternoon along a warm front. Temperatures north of the warm front will be marginal in the 18-00z time frame. We should be able to reach the low 40s by 18z, and then it's a matter of how quickly the precip can cool the atmosphere.
A few inches of accumulation will be possible, especially in the higher terrain surrounding the Cortland, Syracuse and Norwich area. The persistent cyclone over New England will cause snow showers over our forecast area through Friday.
Upper level trough will bring showers today through Friday along with breezy southwesterly winds. Satellite showing the upper level low moving toward the coast of Washington state this morning with showers spreading across Eastern Oregon. Friday morning has a better chance for rain in the lower valleys with passage of the upper level trough and cold front.
The high will slide east today, with winds bcmg light and vrb or southeast by late aftn. /issued 305 AM CST Thu Mar 8 2018/ High pressure continues to settle into the region with cool temperatures across the area this morning. The high pressure center will shift to the east of the area on Friday and return to southerly flow will increase through the day.
Periodic thick high clouds will continue to affect the region this week despite high pressure locked in place.
503 AM CST Thu Mar 8 2018 Last of the snow showers and flurries is exiting southeast Illinois early this morning, as a fast moving upper trough swings into the Ohio Valley. With time, the upper low over lower Michigan will make some eastward progress later today, starting a pattern shift over the central U. In the interim, rather cool air will remain in place courtesy of the low, with another day of highs in the mid to upper 30s on tap. Cloud trends will continue to decrease through this evening, as an axis of high pressure drifts into the region, although cirrus will begin moving in from the west late in the night.
/Issued 245 AM EST Thu Mar 8 2018/ Per obs trends this morning the current Freeze Warning looks on track for western parts of the CWA given some weaker winds and reduced stratocu coverage allowing for more radiational cooling - probably see some spotty other locations reaching the freezing mark by sunrise as well. As ridge weakens and slides further SE on Friday, we should see a transition to SW fetch by afternoon and some moderating temps back up to the upper 50s and low 60s for most locations to round out the work week. A short wave moving across the Ohio Valley will clip extreme north GA Friday night laying down a weak cold front along the GA/TN border.
Low-level moisture will be on the increase Friday as southerly flow advects both higher dewpoints and warmer temperatures northward. A bit more vigorous trough dropping down out of Canada on the backside of the amplified western ridge will come on the heels of the Pacific wave.
Dry weather and a warming trend will continue today as high pressure remains in control. Cooler temperatures with rain and high elevation snow will be possible by this weekend as a storm moves through the area. Upper ridge over the Great Basin will keep dry conditions over our area today with temperatures continuing their upward trend.
Another area low pressure with a chance of snow and rain showers this weekend. Issued a winter weather advisory for snow over the higher elevations of Pocahontas, Randolph, and Webster counties as expecting 2 to 4 inches of snow in 12 hour period. Upper low pulls off to the east on Friday and mountain snow showers come to an end Friday morning.
A slow moving upper trough will move through the region tonight through Saturday night. The trough will give partly cloudy skies with scattered showers.
1010 PM EDT Fri May 5 2017 Strong low pressure moving into the Ohio River Valley will reach the Mid-Atlantic States tonight then lift farther north on Saturday.
Mid-level ridging across the Plains will warm temperatures to slightly above average (low to mid-80Fs).
A nicely amplified ridge axis presently slices through the Nation's midsection, with two closed upper-lows forming the bookends to an unwavering Omega Block over the CONUS, and this general pattern repeats three more times upstream.
1014 PM EDT Fri May 5 2017 Update Low pressure will move northeast tonight and skies will clear.
Surface front and trough are now parallel to the flow aloft with only slight eastward movement expected though the remainder of tonight. Southwesterly to south-southwesterly flow aloft will persist as an upper ridge slowly exits our CWA to the east and an upper trough continues moving-in from the west. In addition, a Pacific cold front is approaching from the west and should cross the Continental Divide tonight before potentially nearing the Chinook, Lewistown, and Dillon areas by early Saturday evening.
640 PM CDT Fri May 5 2017 Large ridge through the central CONUS all the way into central Canada. There is an upper trough along the west coast. Models having no problems with the upper ridge over the southern through northern plains. There is a lot of warm drier air underneath the ridge. After a warm start to the day temperatures will climb into the low 80s over most of western Nebraska.
509 PM MDT Fri May 5 2017 20z surface analysis had weak high east of the CWA with return flow starting to develop in the west ahead of developing lee trough from central MT into central WY. Large upper ridge moving into the Plains states per water vapour.
617 PM CDT Fri May 5 2017 Upper level ridging will build over the Western High Plains tonight and Saturday. Overnight lows tonight will be in the 50s, with afternoon highs on Saturday ranging from the lower 70s east to the lower 80s west.
The dry and abnormally warm airmass beneath a strong upper level ridge of high pressure will slowly migrate eastward over Colorado during the next 24 hours. The axis of this ridge is forecast to shift east of the Front Range on Saturday, which will allow southwest flow aloft to begin advecting mid-level moisture up into the region. The return of moisture and the steep lapse rates produced by strong solar heating should have little problem producing isolated to widely scattered showers and t-storms in the high country by mid to late afternoon. Lastly, near record high temperatures are on tap for Saturday with 80s at lower elevations and very warm 60s and 70s in the high country.
1135 PM CDT Fri May 5 2017 Sfc ridging will dominate our terminal airspace through the next 24 hours.
Lows tonight range from the lower 40s inland to near 50 at the coast.
813 PM EDT Fri May 5 2017 Low pressure over southwest Pennsylvania will track into north over Ontario this weekend.
Upper ridge will continue to dominate our weather tonight into Saturday for most of the region with clear skies and warm air. Area of scattered showers should expand eastward to the Billings area Saturday night as upper trough propagates eastward.
1204 AM EDT Sat May 6 2017 Low pressure will maintain rain chances and colder temperatures through the weekend. Temperatures will be much cooler today. about 20-25 degrees cooler than daytime highs observed on Friday.