Aikyam-Lab/Synoptic-Bench huggingface dataset:
1036 PM MDT Tue Apr 4 2017 Upper level analysis has large trof across the central CONUS, with ridge building across the western US. At the surface, low pressure resides in the southern Plains, with high pressure over the northern Rockies. Upper level trof will continue to shift east this afternoon and evening. Showers will dissipate early this evening as the trough shifts eastward, leaving partly cloudy skies after midnight. Upper ridge will start to build into the area Wednesday night.
1156 PM CDT Tue Apr 4 2017 /06Z TAFs/ A cold front has moved through all TAF sites.
242 AM CST Thu Dec 8 2016 A strong polar high pressure area has settled over the Central High Plains early this morning. High pressure will remain entrenched across the area through tonight allowing much below normal temperatures to persist across the area as well as dangerous wind chills readings falling below zero at times over central KS. As high pressure translates eastward away from the area on Friday, low level southerly winds will allow temperatures to begin to moderate.
1150 PM CST Wed Dec 7 2016 The surface arctic high pressure system will filter in over AR tonight. Later to Thursday morning, the lower clouds will thin and gradually break-up.
The upper trough axis and PVA is currently exiting se WI.
Early morning water vapor imagery/RAP analysis showed the circulation around a large closed low spinning over eastern Manitoba and western Quebec. This closed low will move east today and swing the associated upper level trough across our region and help bring a very cold airmass to our CWA. CAA today will hold temperatures in the 40s at most locations today with our southeast reaching the lower 50s.
349 AM CST Thu Dec 8 2016 High pressure ridge is still well west and southwest of the area which allows the colder air and brief mid level troughs to move through the CWA. Another weak trough in the northwest flow will be bringing mostly cloudy skies to a portion of the CWA today. As the trough moves through, dry conditions will return for late this afternoon and continue through tonight. Temps will be below freezing today with the coldest temps being in the north where most of the cloud cover will be. The cold Arctic air moving into the Midwest for the end of the week will be countered by some relatively warmer air for the end of the weekend.
403 AM EST Thu Dec 8 2016 A slow moving broad upper trough over the Great Lakes will move through southern Canada today and Friday, spreading snow showers into the mountains as it approaches. Ahead of this broad upper trough, a weak cold front will cross the area later today and then followed by an arctic cold front through the region on Friday bringing gusty northwest winds and much colder temperatures that will continue through the weekend.
Cold temperatures continue on Thursday night while lee troughing develops east of the Rockies, shifting northerly surface winds to the south. Warmer temperatures follow suit as weak upper level ridging shifts eastward towards the Plains on Friday, keeping the region dry under northwesterly flow aloft.
The coldest air should be about over with warmer air expected to start to move into the region albeit a very very slow modification overnight. The morning is when the warmer air really starts to move into the region. The one issue of concern that differs from the current forecast is with the Burney Basin where there is a chance that freezing rain may become an issue Thursday morning. The snow levels look like they will lower just enough Thursday night and Friday to impact the Trans-Sierra roadways over the higher elevations.
109 AM EST Thu Dec 8 2016 Weak high pressure dissipates overnight.
1244 AM EST Thu Dec 8 2016 Low pressure in southeastern Canada will move slowly eastward through the end of the week. The strong cold front associated with this low will cross the area on Thursday. Large high pressure will then build in for the early part of the weekend.
A short wave trough will move east from the Lower Mississippi Valley across the Southern Appalachian Region today and will exit off the Southeast Atlantic Coast by early this evening. The lower stratus and alto stratus decks will be gradually clearing, leaving behind a thinning cirrus layer into the afternoon hours.
339 AM CST Thu Dec 8 2016 Arctic high pressure continues to build southeast across the area this morning with a modest surface gradient keeping winds around 10-15kts with gusts still in the 20-25kt range. A few low clouds continue to drift along and east of the Missouri River and a few flurries were reported under these but should continue to drift east as dry high pressure continues to build overhead. The high pressure ridge will extend over the CWA by 12Z Friday with overnight lows tonight close to zero in many areas. Wind chill values through the day will likely be around 10-15 with highs in the low 20s.
1123 PM CST Wed Dec 7 2016 Skies will clear tonight as arctic high pressure builds into the central plains from the northwest. Arctic high pressure remains over the central US on Friday, keeping conditions dry and cold.
The weather in the Florida Keys through this weekend will be governed by the evolution of this fast-evolving arctic air mass and the resulting heat, moisture, and momentum changes in the lower atmosphere.
1242 AM EST Thu Dec 8 2016 An approaching cold front will move through the forecast area Thursday.
/issued 828 PM EST Wed Dec 7 2016/ 01Z water vapor H4 RAP analysis shows most of the CONUS under a very broad longwave trough. This trough is anchored by a large cut-off low spinning to the north of the Great Lakes region. we find weak high pressure nosing into our region from the north. with a trough/weakness in the pattern to the south of the Florida peninsula and across the SE Gulf of Mexico. With more clear skies late tonight and light winds under the ridge. Benign conditions will continue for about another 18-24 hours then northerly winds increase to 20 knots or so behind a cold front beginning late Thursday into Friday.
Progs agree that flat upper ridging will be building into the desert southwest over the next couple of days leading to a warming trend with desert highs forecast to rise into the low 70s by Friday despite another batch of high clouds spreading into the area.
A few snow showers will persist this evening and overnight, mainly across northwest Minnesota, as the upper low continues to very slowly propagate further away from the area. Additional accumulations should be no more than a couple of inches at the high side over main NW MN. arctic high pressure continues to shift over the forecast area.
408 AM EST Thu Dec 8 2016 A trough of low pressure will result in a return to cold temperatures and periodic snow showers through the end of the week.
254 AM EST Thu Dec 8 2016 An arctic cold front will move through the area today. Trailing mid/upper level trough axis associated with the closed low tracking across SE Canada will move into the eastern US today and tonight, and will usher in the first true Arctic airmass of the season. The expansive arctic high pressure will dominate the eastern two- thirds of the country Friday and right on through the weekend.
Afternoon maxes were below freezing in most northern and central valleys today so temperatures have already dipped to the teens in many areas. Precipitation will develop across northern and portions of central Utah by tomorrow afternoon and continue through the end of the week when a low-amplitude trough pushes a cold front into the area. Valleys will begin as snow tomorrow given the cold air in place at the lower levels, but by Friday afternoon, many of these valleys, with the possible exception of those along the Idaho border, should start mixing with or changing to rain.
Temperatures should warm above freezing by mid to late morning, with afternoon highs in the upper 30s to upper 40s.
348 AM CST Thu Dec 8 2016 A longwave trough progressing east towards the middle to upper Mississippi Valley early this morning, has sent down a cold front which was seen on radar moving south nearing the I-20 corridor at 09Z. Thus, areas once plagued with fog across southeast OK and southwest AR has scoured out given the slightly breezy northerly cold front ushering in a drier airmass /dewpoints have fallen into the 20s and 30s/, but bkn-ovc skies persisted. The HRRR and NAM hints at this precip activity shifting south of the FA by mid-late morning due to the impingement of the cold front and drier air entrainment.
Scattered showers developing along the Gulf Coast are expected to increase in coverage and spread northward as an upper trough and cold front approach.
1038 PM MST Wed Dec 7 2016 06Z TAF CYCLE Aviation impacts to focus over eastern NM tonight as low clouds & patchy -FZDZ develop behind an arctic cold front. Added areas of light freezing drizzle to the forecast for east central and southeast areas late tonight into Thursday morning based on recent model forecast soundings. Also added some patchy freezing fog to the forecast around Las Vegas late tonight. A strong cold front will continue to move south through central New Mexico overnight.
Highs today have struggled into the low 20s. This will keep winds chill values slightly warmer than experienced Thursday morning. This will help temperatures be slightly warmer than Thursday with highs in the 20s.
A strong polar high pressure system will build southward into the Central Plains tonight into Thursday, and will linger into Friday with below normal temperatures.
1156 PM EST Wed Dec 7 2016 Low pressure north of the Great Lakes region will move northeast through overnight. A cold front will approach from the west Thursday and cross the region Thursday night and Friday. A low pressure southeast of the area will continue to track to the east away from the area. A second low over James Bay will remain stationary co- located with the upper level low. A high pressure ridge will build north along the Atlantic seaboard through Maine into eastern Canada. For Thursday night, an upper level trough will cross the area with colder air aloft.
Current surface analysis shows strong low pressure now over southern Ontario, with 1045 mb high over southern Alberta. Large upper level trof now covers much of Canada and the United States, with strong jet stretching from the Pacific NW to the Southern Plains to the northeast US. However, there will be less wind across the area as the high moves into eastern MT. Lows Thursday night will drop to near or below zero again as the high moves across ND. Warm front pushes into the cwfa Friday ahead of an approaching low pressure system. Light snow associated with the baroclinic zone and low pressure will develop across the area Fri night into Sat.
A cold front will spread VFR ceilings across the area for the rest of tonight and Thursday morning, with northwest surface winds becoming gusty during the daylight hours.
1201 AM CST Thu Dec 8 2016 Updated for 06Z aviation discussion 06Z TAF discussion: MVFR cigs were observed at most sites at 05Z and will prevail tonight ahead of a cold front that will sweep through the region later tonight into Thursday morning. Clouds will continue to be a major facet to the forecast for another day, but a rather big time (temperature-wise) secondary cold front coming through tonight through tomorrow will finally work to start gradually sweeping clouds south of the region by tomorrow afternoon into tomorrow evening.
Aloft, a deep trough remains poised across the CONUS, with an upper level low moving eastward into Quebec, with a short wave trough moving across the Midwest. Current temperatures are in the low 30s, with some upper 20s invading from far northern Kentucky. We start the period with high pressure in control at the surface.
in association with a weak upper level trough. Much of the lower deck in this scheme will be vfr in nature; however, there could be some periods of mvfr ceiling in the first few hours of the forecast.
1128 PM CST Wed Dec 7 2016 An upper level low is currently located over the Great Lakes region this afternoon. An upper level trough and cold front is current pushing across the Plains. Dry air in the low levels has kept much of the area dry this afternoon, except for east central Kansas into west central Missouri where a band of snow was able to develop, with lingering light snow farther to the north. Lows will drop into the upper teens to the lower 20s tonight with highs not warming out of the 20s on Thursday. Lows Thursday night will drop well into the teens with single digits likely for some of the colder sites as the cold air mass and high pressure will be over the area.
322 AM CST Thu Dec 8 2016 Water vapor imagery early this morning is showing that a confluent upper trough is moving across the area. The RAP is showing that the trough axis will move quickly off to the east this morning. The forecast will remain dry today and tonight as subsidence sets in behind the trough axis. Expect skies to remain mainly clear over the area as the RAP is showing the low level flow gradually straightening out, and then becoming slightly anticyclonic by this evening as high pressure moves in. With strong cold air advection today, will go slightly cooler than MOS highs and stay closer to SREF mean temps in most areas. Carney The ridge axis will be over the eastern Plains on Friday morning.
Before then, a few flurries (perhaps even light freezing drizzle) could fall, though no impacts are expected. High pressure will continue to build in through the evening with surface winds increasing to near 20 knots from the NE with higher gusts. expect a few snow flurries with also the chance of some very light freezing drizzle. Highs tomorrow struggling to reach the freezing mark on the Caprock. and a few degrees warmer in the SE Panhandle and Rolling Plains in the mid 30s. James Tomorrow's stubborn low clouds should undergo steady erosion and thinning by Thursday night as cold surface ridging departs the region. Despite breezy downslope winds and more sunshine, high temps will struggle to break out of the 40s thanks to a lingering 850mb thermal trough and chilly/recycled southerly trajectories.
Arctic high pressure settles over the region tonight, which will set the stage for some bitterly cold temps.
The old boundary will finally begin to push southward during the day tomorrow as strong high pressure builds in over the area. So, in the highest elevations across northern GA, temps may remain nearly steady from overnight min values. Expect some mid and high clouds to spread down from the north along a cold front.
Main trough axis is shifting eastward into the Plains. leading edge of strong cold front moved through KAMA around 18z with strongest winds noted across the western half of the CWA. Can't rule out some light freezing drizzle before the profile cools to around minus ten degrees later tonight converting any precip to flurries. Upper level trough shifts east with more zonal flow aloft ahead of the next wave. High will be much warmer with 40s and 50s across the Panhandles with help from downsloping winds gusting to 30 knots during the afternoon.
Mean troughing will prevail aloft across the entire CONUS through the period. The leading edge of the ridge is already nosing into the region and is acting as a stable, cool dome. The same setup will exist tomorrow until a dry front begins to move into the region, on the leading edge of the reinforcing ridge, and scour out the low level moisture. The strong gradient created by the building ridge will cause winds to remain elevated on Thursday night, so even though the airmass will be considerably dry, lows should range from the mid 40s across the southeast Big Bend to the mid 30s in southeast Alabama. The core of the upper trough will be at its closest on Friday, and although we'll mix a bit better than previous days, we'll be mixing into some cooler temperatures aloft.
329 AM CST Thu Dec 8 2016 Clouds along with some light snow and flurries at times is expected again today into tonight as the upper low continues to pull away but cyclonic flow aloft persists. The warmest highs today will be north of I-94 where thermal profiles are just a bit warmer. After quiet weather under the influence of high pressure on Friday, the upper air pattern becomes zonal to start the weekend.
1242 AM EST Thu Dec 8 2016 A trough of low pressure will result in a return to cold temperatures and periodic snow showers through the end of the week.
251 AM EST Thu Dec 8 2016 Weak high pressure over the Carolinas will weaken and shift east tonight. An arctic cold front will move through the area Thursday, followed by an expansive arctic high for the weekend. Lows generally should bottom out in the lower to mid 40s as the clouds thicken up. Any light warm advection driven precip Thursday morning will shift east and may consolidate or become a little more showery as fgen strengthens and the cold front sweeps across the area. Highs should reach the low to mid 50s.
Warm air advection will move over the cold dome at the surface tonight and temperatures in this warm air aloft may get above freezing. Am a little concerned about the possibility of some very light and patchy freezing drizzle across the western panhandles if the low level moisture can get back. So confidence is not very high at this point, and will not mention it as a hazard, but will have some very light patchy freezing drizzle in the forecast after midnight tonight until noon on Friday.
As a result, a decent snow band of 1 to 5 inches extends from the lower Yakima valley across the Tri-Cities into the Washington Blue mountain foothills.
Medium A trough and associated cold front will move through this evening into tonight. Light accumulations are possible mainly across the southeast half of the forecast area, with the highest amounts of an inch or so toward the Illinois border. Since this will be a fast moving and fairly narrow band of snow, confidence in where the highest totals will set up is not very high. Should see sunshine return tomorrow under high pressure, but at the cost of chilly temps.
The cold front that pushed through the area today will stall out across the southeast overnight. Rain will end from west to east overnight Tuesday as a secondary cold front moves through, and cooler air will follow this frontal passage.
1136 AM CST Mon Dec 12 2016 For the 18Z TAFs, a weak cold front will move across the terminal sites this evening and tonight with winds becoming north.
128 PM EST Mon Dec 12 2016 A cold front crossing the Ohio Valley will move through the area tonight and become nearly stationary across Georgia. The front will move back north as a warm front Tuesday.
The cold front is now crossing the forecast area, with temperatures already falling across southeast Ohio. One concern will be the western slopes of the ridges. With upslope flow and lingering low level moisture, some freezing drizzle is anticipated late this afternoon into tonight, as ice crystals will be lacking. Have thus issued a Freezing Rain Advisory for trace icing. Cannot rule out a very brief period of freezing rain at the onset of precipitation but chances are too low to include yet.
1226 PM EST Mon Dec 12 2016 Colder air will move into the area today following a cold front which moved through this morning. High pressure will build into the area behind the front today providing dry conditions.
The cold front which will stall out near a JAN-MGM line this evening, then lift back northward as a warm front overnight as a new surface wave develops in Louisiana in response to the first of multiple weak upper level vorticity impulses. The models suggest the surface wave shifting east into southeast TN or north GA by afternoon dragging a cold front back southeast.
A cold front will bring another wind shift overnight, although overnight winds will be rather light at most locations. Cirrostratus is keeping temps in the low 30s late this morning across central and northern OK.
An additional inch or two snow accumulation will be possible across the highest elevations of the eastern mountains. High temperatures will range from the lower/mid 30s for the lower elevations to the mid 20s to lower 30s mountains.
/ISSUED 622 AM CST Mon Dec 12 2016/ Have extended the Dense Fog Advisory through 8 AM, however may cancel by 7 AM for the counties along the Highway 90 corridor as observations and webcams show lifting of the dense fog. A cold front is making progress to the south across South Central Texas early this morning. Solar heating will allow for a warm layer of temperatures off the surface to mix down with highs near to slightly above normal today and well above normal on Tuesday, however, another cold front will be moving across Central Texas late Tuesday afternoon.
110 PM CST Mon Dec 12 2016 Broad upper trough extending down from Canada will spin over the Eastern US as upper ridging grows over the West the next few days. Late in the week the ridge will slide eastward as a new upper trough moves over the NW coast.
252 PM CST Mon Dec 12 2016 A strong cold front is expected to track rapidly south across the local area this afternoon through tonight. the airmass will be significantly cooler.
310 PM CST Mon Dec 12 2016 A weak cold front will pass through Oklahoma and north Texas late tonight and early Tuesday.
426 PM EST Mon Dec 12 2016 Rapidly moving low pressure will spread some light snow over the Upper Ohio Region on Tuesday, and will usher in an arctic airmass for late week. A cold front will complete a sweep of the area this evening, but measurable precip is not anticipated given a shallow mixing layer and lack of moisture in the mid levels. Nevertheless, moisture in the boundary layer may be sufficient for some freezing drizzle over the ridge zones; hence, a freezing rain advisory remains in effect tonight for those areas.
Digging south of a broad upper trough from Canada into the central U. will bring reinforcing high pressure south to the coast, which will push all the rain and moisture south.
Mostly cloudy skies east of I-55 (MVFR ceilings) still expected to become mostly sunny during this afternoon as 1024 mb high pressure over southeast KS and nw parts of IL and MO ridges into central IL during this afternoon and evening. Clearing is spreading east into the forecast area this morning as drier air advects into the region behind a cold front. Clouds should come back in this evening ahead of the second cold front.
SHORT TERM (Tonight through Tuesday Night): A weak cold front that moved into the western half of the CWA has stalled as an area of low pressure has developed across the coastal sections this afternoon.
241 PM EST Mon Dec 12 2016 High pressure crosses tonight. A cold front crosses Tuesday night, followed by much colder weather through the balance of the work week. In coordination with neighbors, issued freezing rain advisory for freezing drizzle 21Z-08Z tonight for western slopes and highest terrain. Low level moisture beneath post-frontal inversion will lead to freezing drizzle in the northern WV mountains, as low level cold advection continues. High pressure will build overnight, ending the drizzle and breaking up the clouds. A pair of upper level waves out ahead of an approaching cold front will cross as a split system, with showers possible across the northern and southern fringes of the forecast area.
306 PM CST Mon Dec 12 2016 Weak high pressure of 1022 mb was over central MO/IL this afternoon had decreased the stratocumulus clouds over eastern IL. An arctic cold front over central MN into northern Nebraska, will track southeast to near the IL river by 12Z/Tue and will race southeast of IL by 18Z Tue.
Light southerly winds tonight will bring warmer temperatures to all of the forecast area overnight with morning lows mostly in the mid 40s - compared to lows in the mid 30s recorded this morning. Winds will remain light but will begin shifting to the north tomorrow morning as another weak cold frontal boundary begins to move south through West Central Texas. With the frontal boundary arriving later in the day south of I-20, the central CWA will have warmer highs than yesterday with temperatures in the mid to upper 60s. The southern CWA will have even warmer highs in the upper 60s to the lower 70s.