Aikyam-Lab/Synoptic-Bench huggingface dataset:
/issued 231 PM CDT Tue Sep 27 2016/ SHORT TERM (Now through Wednesday night): A weak coastal trough lies offshore, still triggering isolated convection, but coverage is on the decrease over land as north winds and lower dew points take hold. Have trimmed back pops for tonight through Wednesday night, and gone with scattered or less showers through the short term, which is a lot less than a model consensus was advertising, probably trying to bring the coastal trough onshore. Cooler, drier air is filtering in and essentially turning a convective situation into an overrunning one, however, and a weak one at that. Temperatures will be slightly cooler, in the lower to middle 70s at night, with some upper 60s possible in the upper valley.
High pressure remains over the region with sunny skies and temperatures in the middle 70s to around the 80 degree mark. Clear skies will occur through tonight, but with a light southwesterly wind lows will be slightly warmer tonight than it was last night. Lows tonight will be in the lower to middle 50s. The upper level low will sag south sending a cold front through the area on Wednesday. Winds will shift to the north behind the front and a cooler air mass will spread into the area. Highs on Wednesday are expected to top out in the upper 60s to the lower 70s with lows Wednesday night dropping into the 40s. Cooler conditions will prevail across the area through the end of the week.
Thereafter, a dry cold front will bring about a north wind shift with speeds increasing into the 9-12 kt range in the Metroplex. The system which will have the highest impact on our region is likely the upper low over the Great Lakes region. Flow around the western flank of the upper level low has forced a cold front southward all the way to the upper TX Coastal area. Behind this front, cooler and drier has settled in across the region. For today, we saw more in the way of mid and high clouds than previously expected due to the presence of both an upper low over northwest Mexico and Tropical Storm Roslyn in the Eastern Pacific. However, the upper low is forecast to lift northwestward and weaken tonight and Wednesday.
Temperatures will be cooler than last night with lows in the 40s to lower 50s. An upper low will be approaching the Pacific northwest Thu and Fri. The low moves slowly inland Sat and Sun with a better chance of rain and much cooler temps.
853 PM MST TUE SEP 27 2016 A low pressure system over northwest Mexico will continue to slowly move north through the Desert southwest the next few days.
637 PM CDT TUE SEP 27 2016 A cold front will bring a wind shift to all TAF sites on Wednesday.
623 PM CDT TUE SEP 27 2016 For the 00Z TAFs, a weak cold front will move across the terminal sites on Wednesday with winds becoming north to northeast. /Issued 302 PM CDT TUE SEP 27 2016/ Current water vapor imagery shows stacked upper low over the Great Lakes region beginning to push south towards the upper Ohio Valley. The upper low over the Great Lakes is progged to become a cutoff low as it moves south out over the upper Mississippi Valley while a more robust ridge builds in over the Plains.
High pressure will break down and shift east tonight as a weak storm system moving up from the south begins spreading moisture back to the area. High pressure remains centered over northern Utah this evening but will shift northeast in to Wyoming overnight as a low pressure system over northwest Mexico lifts into the desert Southwest.
701 PM EDT Tue Sep 27 2016 Nearly stationary upper level low pressure over Lake Superior will continue to bring dry and seasonally warm conditions to the North Country through Wednesday.
A cold front will move across Oklahoma and north Texas on Wednesday.
1045 PM EDT Tue Sep 27 2016 An upper level low will work into the region on Wednesday and influence the weather pattern through the remainder of the week. Upper level low centered over northern Michigan to drop slowly south into the Ohio Valley. Clear to mostly clear skies will give way to an increase in clouds overnight as an upper level low approaches the area. Went on the cooler side of guidance for low temperatures overnight. Increased precipitation chances for the day on Wednesday as the upper level low pressure system approaches the area.
A low pressure system over northwest Mexico will continue to slowly move north through the Desert southwest the next few days.
Considerable high cloudiness continues to stream over the region with some sctd stratocu noted in the lower lvls. Skies are expected to gradually clear through Wednesday morning with overnight lows on track to reach the lower 60s north/mid and upper 60s south. Lower cu field noted over lower Acadiana where dewpoints have recovered into the low 70s and where radar is showing development of a few showers. Fair weather pattern expected through the week as drier air and cooler temperatures continue to settle over the region. Great Lakes mid/upper low progged similarly by models to settle south southeast into the Ohio valley during the latter part of the work- week, ejecting northeast through the weekend.
851 PM EDT TUE SEP 27 2016 Aviation A large area of low pressure over the central Great Lakes will produce cool temperatures and showery weather during the next several days.
856 PM EDT Tue Sep 27 2016 A cold front will move well offshore this evening. High pressure will gradually build into the region from the north late Wednesday and Wednesday night. The high will remain parked to our north while low pressure over the midwest drifts slowly north and east.
821 PM EDT Tue Sep 27 2016 An upper level low will work into the region on Wednesday and influence the weather pattern through the remainder of the week. Clear to mostly clear skies will give way to an increase in clouds overnight as an upper level low approaches the area. Went on the cooler side of guidance for low temperatures overnight. Increased precipitation chances for the day on Wednesday as the upper level low pressure system approaches the area.
Chattanooga Airport, TN 56 82 57 71 / 0 10 20 10 Knoxville McGhee Tyson Airport, TN 54 79 57 70 / 0 10 40 30 Oak Ridge, TN 53 79 56 69 / 0 10 40 30 Tri Cities Airport, TN 50 78 52 67 / 0 10 50 50.
Slow moving cold front is still somewhere in the vicinity of Interstate 20. Winds swing back around to a westerly component on Wednesday ahead of another stronger cold front.
824 PM MDT Tue Sep 27 2016 Strong upper level ridge will bring quiet weather to our region tonight, with the only real feature of interest being a Canadian cold front which has just passed through Great Falls and will reach our cwa overnight. Otherwise this will be a dry frontal passage as we remain dominated by the ridge aloft. Expect another reasonably mild night tonight, then cooler temps Wednesday, but with highs still above normal for late September.
1144 PM CDT Tue Sep 27 2016 Water vapor shows that one last vort max rotating quickly south and southeast around the upper low in northern lower Michigan. Dew points continue to climb into the lower 40s over eastern ND and one area of clouds advecting in pretty far west and should keep GFK and FAR much milder tonight than advertised. Across the valley and NW MN conditions less certain with model RHs fields suggesting more clouds overnight and dewpoints have held in the low to mid 40s. Quiet fall weather is expected late this week through the weekend as the cut-off low continues to slowly meander towards the Ohio Valley and ridging remains over the north central US.
614 PM CDT Tue Sep 27 2016 The cool and dry trend will continue through the remainder of the work week as a mid-level ridge situated over the Rockies gradually builds into the Central Plains. This feature will be blocked by a deepening upper low over the Great Lakes to the east along with a developing trough over the Pacific Northwest expected to deepen through the latter half of the week. The upper low across the Great Lakes will sink southward tonight, which will send a secondary surface cold front into northern Missouri early Wednesday morning. Generally expecting lows in the upper 40s behind the frontal boundary with lows in the low to mid 50s ahead of the boundary.
1147 PM CDT TUE SEP 27 2016 Deep upper low continues to spin over the Great Lakes with ridging over the Great Basin into the Rockies. At the surface, high pressure is situated over the southern Plains. Upper low over the Great Lakes will sink south and will be situated over the Ohio Valley by Wed night. 850mb temps on Thu support highs struggling to get out of the low 70s.
Meanwhile, disturbed surface flow from this afternoon's convection will take on a light offshore component overnight as the axis of weak high pressure remains centered to our south.
744 PM EDT Tue Sep 27 2016 Nearly stationary upper level low pressure over Lake Superior will continue to bring dry and seasonally warm conditions to the North Country through Wednesday.
Later start to convection expected tomorrow as first trough axis crosses region overnight.
Slow moving cold front is still somewhere in the vicinity of Interstate 20.
Vapor imagery and upper air data showed a closed low centered over the Great Lakes, with a potent short wave trough digging across the upper Midwest.
Dry high pressure will remain over the area with good radiational cooling and rapidly falling temps this evening. By late night, the axis of the ridge will lie across the southeast half of Middle TN, so that is where temps are mostly likely to dip into the mid to upper 40s with patches of fog. Forecast data has been updated to lower the low temp forecast a few degrees for the southeast half, and for low lying areas across the rest of the Mid State. A cold front approaches the area early Wednesday and passes across CKV and BNA by the end of the forecast period.
A weak area of low pressure will bring a slight chance of afternoon showers and thunderstorms to the mountains and adjacent valleys of Ventura and Los Angeles Counties on Wednesday.
1040 PM EDT TUE SEP 27 2016 A cold front will slowly push into the area through Wednesday night. Cooler and drier more seasonable temperatures expected late in the week and over the weekend with little rain chances. Cold front continues to move into the upstate with showers and thunderstorms moving into the western Midlands and northern CSRA. Models are a fairly good agreement on the movement of the Great Lakes upper low the next few days.
947 PM MST Sun Jan 29 2017 The pattern across the lower 48 begins to deamplify as the California high weakens and the east coast trough exits.
41 Prospects for accumulating snowfall diminishing for all but the highest elevations of NE GA.
/Tonight through Monday/ Iowa is centered between a larger area of low pressure well off to the east and a large area of high pressure across the intermountain west. Northerly upper level flow that has been in place across the region will become slightly more northwesterly tonight into Monday as a developing upper level trough moves atop the western US upper ridge, and quickly drops into the northern plains by 12z Monday. This system will bring an associated warm front through the area late tonight into Monday with winds shifting around to south/west.
After sub-freezing lows this morning, highs across the region will be mostly in the 50s today. High temps should be roughly five degrees cooler Wed compared to Tue. Lows are expected to be at or above freezing tonight and Tue night.
The upper level ridge over California, the Great Basin and parts of the Desert Southwest will gradually weaken today and tonight, and a weak upper low will drift southeast over the Baja Peninsula. Temperatures will be warmer today with full sunshine and increasing 850mb temperatures. Overnight lows will be in the lower 40s across the Big Country area along and north of Interstate 20, where wind speeds will be a little higher.
1126 PM CST Sun Jan 29 2017 WV imagery this aftn showing a well amplified upper ridge situated across the wrn half of the conus along with a deep downstream trof to the east.
Quasi Rex block over the western CONUS with ridge into southwest Canada. Deep eastern CONUS trough with strong cold front off the east coast. As the trough to the east continues to move eastward the ridge across the west will begin to deamplify giving us one more day of unseasonable temperatures. The main concern for the forecast period will be the high temperatures. Models again having difficulties with the pattern change as the upper ridge to the west flattens.
348 AM EST Mon Jan 30 2017 Weak high pressure returns Monday with cooler near seasonable normal temperatures. Upper level trough is swinging through the region in rather uneventful fashion with variable clouds and a few passing mountain flurries being the bulk of the excitement so far. Weak high pressure and drier in the lower levels should lead to some partial clearing across southern counties where downsloping effects will occur. Monday night a weak ridge of high pressure moves overhead.
355 AM EST Mon Jan 30 2017 A cold front will move offshore early today.
Snow showers will continue into this evening as an upper trough pulls away from the area. as a strong trough dips out of canada across Indiana into the deep south. stuck with the cooler lows in the upper teens. High pressure will assert itself in the wake of this system and as a result the remainder of the short term will be dry. seasonably cool weather can be expected for late week into the first half of the weekend as the Ohio Valley remains under the influences of northwest flow aloft and strong high pressure at the surface.
Skies will become partly cloudy as a result, but they will start filling in again Monday morning ahead of a warm front. Temperatures should warm up nicely and reach the lower 40s over the southwest/southeast CWA, with mid 30s north of I-74.
Cool high pressure builds in from the gulf coast to Florida ushering in a cooler and drier air mass to the area. Have continued with previous fcst mins which are cooler than guidance and may also have patchy late night frost especially across inland Ne Fl.
Temperatures will fall into the lower 30s over most areas with perhaps some upper 20s across the eastern Ozarks. High temperatures will range from the middle 50s across the eastern Ozarks to the lower 60s along the I-49 corridor.
The center of high pressure bringing us the nice, albeit cool, weather remains centered just off the southern California coast. Winds remain from the north and northwest as they move anti-cyclonically around the high ushering in cooler air to the region. By tomorrow, the jet stream will become more zonal than meridional and will start breaking down the ridge axis to our north.
/ISSUED 305 PM CST Sun Jan 29 2017/ North and Central Texas will remain between a ridge of high pressure across the West Coast and a broad trough across the eastern half of the nation.
Strong high pressure will remain over California through the next few days, maintaining dry weather conditions and resulting in continued warming into tomorrow.
313 AM EST Mon Jan 30 2017 A coastal low pressure will develop off southern New England today. Behind it a cold front will usher in high pressure for tonight.
A weakening cold front will move southeast through western Washington this evening, with moist onshore flow keeping a few showers in the forecast for the rest of tonight.
Clearing skies through Sunday afternoon into the overnight hours along with weak high pressure/light winds have allowed temps to drop off considerably, with even a few subzero readings, something we haven't seen much of lately. The 00Z MPX sounding indicated lot of dry air to overcome in the low-levels. At this point, the highest totals over these counties looks to be from around I-94 and points north.
Chattanooga Airport, TN 31 47 35 61 / 20 0 0 0 Knoxville McGhee Tyson Airport, TN 29 42 32 59 / 60 10 0 0 Oak Ridge, TN 29 42 34 58 / 60 10 0 0 Tri Cities Airport, TN 25 38 27 55 / 80 10 10 10 TN.
300 AM EST Mon Jan 30 2017 A cold front will move offshore early today.
Latest surface analysis indicates a weak area of high pressure was located just to our west and that feature will drift over our area through the mid morning hours. Models continue to suggest the bulk of the precipitation associated with the low and mid level warm advection pattern will remain just to our north.
A strong mid level ridge will remain in place across the region through midweek. The large-scale pattern this evening continues to show a ridge extending across the Great Basin. Valley inversions have strengthened in response to warmer air aloft spreading into the area, and inversion heights have also lowered a bit from yesterday. The lowering of inversion heights could also result in a better chance for fog in some areas tonight. Cirrus streaming across the area may keep overnight mins slightly warmer than last night across the valleys, but are otherwise not expected be a significant factor in weakening the inversions.
Some discrepancies in the latest hires model output on where the highest potential is for bands to develop. Snow shower coverage will begin to decrease by midday as the upper trough exits to the east. Another system will quickly cross the Great Lakes tonight, spreading light snow across the region along a lifting warm front.
1211 AM EST Mon Jan 30 2017 Low pressure over eastern Canada will continue to bring a northwest flow of air.
The upper level trough currently influencing our weather will move out of the area tonight, bringing the cloud cover with it. The southwestern third of the forecast area will likely see the low 60s while the remaining area will see the 50s.
245 AM CST Mon Jan 30 2017 On the large-scale this morning, water vapor imagery showing an upper closed low over eastern Canada with broad upper ridging extending along the West Coast into the Northern Rockies. Closer to home, strengthening southerly flow in advance of this feature will lead to the warmest day in quiet some time as 850 thermal ridging characterized by temps of 6-10C overspread our region ahead of a trailing cold front that will begin pushing through our area by late afternoon and evening. Heading into tonight, aforementioned cold front to continue tracking south of the fcst area with high pressure building in its wake.
406 AM EST Mon Jan 30 2017 Along the Florida Keys and the adjacent waters, a chilly overnight is well underway with a wide range of temperatures varying from 50 degrees at Big Pine Key to the lower 60s in a few island communities. Surface wise, a lengthy ridge axis covers most of the Gulf of Mexico and into the southern portion of the Florida peninsula and our region.
Low level jet will strengthen overnight, but will keep winds just below wind advisory criteria in the higher elevations for now as it looks borderline.
The past few days have been warmer than forecast and so have warmed temperatures a bit from previous forecast. Winds will turn more toward the northwest during the day as a weak cold front moves through the area. With the cold front passing through the area during the day, temperatures will cool off a little for tonight. Lows in the mid to upper 20s will be a bit cooler than the past couple of nights, but still above normal for this time of year.
Another cooler northerly surge pushes re-enforcing cooler air south over the Southeast tonight ( affecting mainly the eastern half of the FA in the process ).
1245 AM EST Mon Jan 30 2017 A cold front will move offshore early today.
1240 AM EST Mon Jan 30 2017 The combination of an upper level trough moving across the Great Lakes and northwest winds behind it is expected to cause 2 to 6 with locally 9 inches of snow by late morning across southwest Michigan and northwest Indiana.
344 AM CST Mon Jan 30 2017 Downslope flow ahead of a very weak cold front will allow temperatures to rise well into the 60s today. There may be readings near 70 on the lower terrain at Ashland where the west to northwesterly downslope winds will have descended the most.
340 AM CST Mon Jan 30 2017 Warmer temperatures are expected today due to rising upper level heights, low to mid level warm air advection, and south- southwesterly surface winds. A weak and dry cold front will move southeastward through our area tonight. Despite this along with little cloud cover the lows tonight will remain above normal. For much of the upcoming week, this will result in a primary storm track that will be to our north and result in average to above average temps, with a gradual trend towards cooler temps later in the week.
305 AM EST Mon Jan 30 2017 A cold front will move offshore early today.
350 AM CST Mon Jan 30 2017 Thermal ridging is set to amplify today from eastern NM through the Panhandles in advance of a sluggish cold front that should decay near I-40 by daybreak Tue. In spite of a minor trough in dry northwest flow and associated height falls, net thickness gains today within the thermal ridge will clearly win out and ensure unseasonably mild highs.
1146 PM EST Sun Jan 29 2017 A weak cold front will move off the coast overnight. Weak high pressure will build over the region Monday night.
High pressure will continue to be the dominant weather feature on Monday. Monday night a short wave diving southeast out of the northern plains will push/pull a weak cold front across the CWA but due to a lack of moisture no precipitation is expected.
The region remained under meridional flow today with a broad mid- level trough over the eastern U. and a mid-level ridge stretching across the western U. Even though this trough axis was shifting a bit further to the east today, the northwesterly flow aloft continued to allow some very weak embedded waves, and thus scattered cloud cover, to stream across portions of northeast and east central KS. However, breaks in the cloud cover allowed for some decent afternoon heating with temperatures reaching into the low 50s to mid/upper 50s from east to west.
Cloud cover associated with the trough axis that is gradually moving east will likely slowly recede overnight and may make some adjustments to the sky cover forecast based on satellite trends. In addition, temperatures across the forecast area are registering slightly cooler than forecast. Thus, lows will be milder Monday Night staying above freezing.
325 AM CST Mon Jan 30 2017 High pressure ridge over the dvn cwa providing clear skies and light winds. Return flow around the ridge has developed an area of low stratus in central IA with warm air advection mid/high level clouds streaming southeast into MN and nw Iowa. The storm system should pull warmer air into the cwa with highs ranging from the lower 30s in far nw IL to around 50 in extreme northeast MO.
404 AM EST Mon Jan 30 2017 Relatively quiet fcst on tap with ridge dominated regime and NW flow aloft. Expect gradient winds to be enhanced out of the WNW today gusting up to 25 mph so should still seem a bit cool for skin temps despite slightly warmer highs today for most locations though a few degrees below norms.
Best overall moisture/lift remains north of the I-94 corridor and this is where the highest snow totals are expected. Highest chances for snow accumulation in the vicinity of the MS River will be along ridge tops where up to one inch is possible. The valley itself could see little to no accumulation given warmer temperatures.
1251 AM EST Mon Jan 30 2017 The combination of an upper level trough moving across the Great Lakes and northwest winds behind it is expected to cause 2 to 6 with locally 9 inches of snow by late morning across southwest Michigan and northwest Indiana.
321 AM CST Mon Jan 30 2017 Northwest flow aloft continues overhead due to the presence of a deep upper trough over the eastern half of the country and a ridge over the west. ridge has already begun to influence North and Central Texas in the form of Spring-like temperatures during the day. This warming trend will continue for the next couple of days as the western ridge expands east across the central part of the CONUS, with lows in the 40s and highs mainly in the 70s expected through mid-week.