Aikyam-Lab/Synoptic-Bench huggingface dataset:
925 AM MST Sun Dec 31 2017 Freezing fog developed over the Milk & Missouri River Valleys. Without much wind under the high, wind chill below minus 40 is hit and miss, but with most temperatures well within the advisory criteria of minus 20 to minus 40, wind chill warning headline still seems reasonable. For the remainder of the week, upper ridge along the west coast will shift eastward over the Great Basin. This will spread warmer air across the divide, starting with a chinook in Alberta on Monday.
109 PM EST Sun Dec 31 2017 Canadian high pressure will maintain very cold conditions through the week.
--PGW-- A high pressure ridge will slowly migrate east across the West Coast and Great Basin through the week, before moving across Colorado over the weekend.
That said, it is quite possible that we will see fairly widespread freezing fog along and east of I-25 after 00z w/ light upslope and/or upvalley flow. High resolution guidance from the HRRR suggests dense fog potential, so the evening shift will need to monitor for a possible Freezing Fog Advisory at some point. However, it will be warmer than previous days. The rest of the week should be a bit milder as the upper level ridge moves over the region.
Ended up with little fog, except in the lower treasure valley along the Snake River. With lighter winds aloft, will see less mixing today and thus cooler valley temperatures. Early morning patchy fog that develops overnight will burn off before noon, but should redevelop more widely early Monday as an upper ridge moves over the region. As warm air streams in aloft with the ridge, inversion conditions will redevelop in the valleys with temperatures there trending colder Monday and mountain temperatures trending warmer.
300 PM CST Sun Dec 31 2017 WV imagery this afternoon was showing the extreme western CONUS under the influence of an anomalous upper ridge situated over west coast. Meanwhile, a deep longwave trof was in control over the eastern half of the country. an intense large area of high pressure was in control across the majority of the CONUS.
For Monday, drier and somewhat warmer air will spread across the forecast area.
Strong high pressure will continue to build into the Plains during this period. Wisconsin will remain on the eastern side of the high, resulting in a pressure gradient and continuing northwest winds.
High pressure dominates the central California interior through the New Year.
High pressure will remain dominant across the region through the week as temperatures continue to run above normal with highs mostly in the 70s. Upper level ridging will remain over the Southwestern U.
For the remainder of the week, upper ridge along the west coast will shift eastward over the Great Basin. This will spread warmer air across the Divide, starting with a Chinook in Alberta on Monday.
Water vapor imagery depicted a broad upper level low over eastern North America with north-northwesterly flow aloft over the northern plains. A pocket of low level moisture on the northeast side of the mid-level ridge axis may produce some low stratus over central and northwest North Dakota overnight.
The upper pattern will continue to have a ridge near the West Coast and a downstream trough over eastern North America throughout the period.
Sunny to mostly sunny skies prevailed across most of the area as high pressure builds into the central Plains.
For Monday, a series of upper vort maxes to wrap over the region as upper troughs come in phase to push entire Gulf system right into West Central and SW FL through the day with additional upslope energy keeping cloudy skies and rain chances well after the front passes. The cold front will continue to slowly move southward through the day. Overcast skies, rain cooled air and breezy Arctic high pressure filtering behind the front for daytime temps that will struggle to reach 50 degrees in northern areas, 60 degrees central areas, but near 70 degrees ahead of front in southern areas. The period starts with the passage of a cold front through west- central and southwest Florida.
119 PM PST Sun Dec 31 2017 High pressure aloft will maintain fair and mild weather this week, with periods of high clouds, as areas of low clouds and fog visit the coastal areas each night.
Monday looks nominally warmer, with highs in the teens instead of the single digits. Models continue to have H5 ridge over the west coast shift eastward thru the week. thanks to shifting east of the H5 ridge.
Temperatures have fallen back into the low 80s and these tiny little sprigs of showers trying to stream into Middle TN from the south should begin to wane.
1134 PM CDT Sun Jun 11 2017 Low pressure over the Great Plains combined with high pressure moving off the southeast Atlantic Seaboard is providing the area with warm and moist southerly flow this afternoon. but subsidence from the ridge aloft is keeping it pretty flat. Expect lows Monday morning to be a few degrees warmer over all than this morning. Monday afternoon highs should be around the same as today's if not a little warmer. but persistent subsidence from the ridge aloft should preclude widespread convection. With increasing low level RH on Monday there will likely be more diurnal cu on Monday afternoon and slightly warmer temperatures some isolated convection could pop up over the Ozarks.
Took out fog at TRI in the early morning hours due to slightly warmer overnight temps compared to last night. Warmer temps will create a bigger T/TD spread.
1203 AM EDT Mon Jun 12 2017 High pressure will result in dry and warm weather for the start of the new week.
958 PM EDT Sun Jun 11 2017 A weak cold front will cross the area this evening and stall across the region overnight. The front will lift north as a warm front on Monday as a weather disturbance tracks across the area from the west. A cold front cross the area Monday night. Winds will diminish this evening as a weakening cold front moves into the area and stalls. Tonight will then bring some cooling across the north with lows dropping into the low 50s, but be warm Downeast with lows in the low to mid 60s. A weather disturbance approaching from the west will then lift the stalled front north as a warm front on Monday.
728 PM EDT Sun Jun 11 2017 A weak cold front will cross the area this evening and stall across the region overnight. The front will lift north as a warm front on Monday as a weather disturbance tracks across the area from the west. A cold front cross the area Monday night. Winds will diminish this evening as a weakening cold front moves into the area and stalls. Tonight will then bring some cooling across the north with lows dropping into the low 50s, but be warm Downeast with lows in the low to mid 60s. A weather disturbance approaching from the west will then lift the stalled front north as a warm front on Monday.
Since the low level jet will be a bit weaker tonight than last night, ceilings will be slightly lower Monday morning than they were this morning. The low clouds that spread across parts of the forecast area this morning started breaking up late morning and skies had become mostly sunny across most of the region by mid afternoon. Water vapor satellite imagery continues to show an upper level low over far Southeast Texas this afternoon.
547 PM MDT Sun Jun 11 2017 A closed 550mb low pressure center was located over northern California early this afternoon with broad southwest flow ahead of it covering much of the country. At the surface a cold front extended from northeast Nebraska through Oberlin and Tribune Kansas into southeast Colorado. On Monday the upper low is forecast to be over much of Nevada and during the day is expected to pivot its way into southern Idaho. At the start of the period, upper ridging dominates the eastern half of the country while an upper low digs into the Pacific Northwest.
Upper low over the shifted east throughout the day but should gradually fill and the moist axis which was directed into Central LA coastal areas today will start to retrograde back westward overnight into Extreme SETX-BPT area by 21z Monday. Sfc dew pts have increased and overnight low temps will only cool into the lower/mid 70's. An upper level low will remain over the region through Monday and the combination of increased low level moisture and the upper level feature will provide the area with scattered showers and isolated thunderstorms on Monday.
An elevated warm front was located over the southern third of the forecast area at 1930Z. Elsewhere, high pressure was in play. The showers and storms will end from west to east over northwest Wisconsin later tonight with the high pressure in charge. A stronger area of high pressure over Manitoba will affect the region on Monday. A warm front will continue to be the focus for showers and thunderstorms early in the period. On Monday night, the warm front will start to lift northward across Minnesota and Wisconsin, generating thunderstorms first in the south, and then spreading northward during the night.
With mid level lapse rates are 7 to 8 C/km and and deep layer shear 40 to 50kts we should see some potentially severe storms with hail and strong winds if/when convection develops into south central MN closer to old outflow and developing warm front. With the front along the MN/IA border into Monday we will continue the lower end chance PoP forecast until a stronger forcing mechanism returns perhaps late Monday afternoon.
534 PM MDT Sun Jun 11 2017 PAC NW Upper trough will eject toward the region the next 24 hours, supporting a vigorous storm system into the region Monday evening and overnight.
In the upper levels, the area continues to be under southwesterly flow, with high pressure extending along the eastern CONUS and low pressure spinning over northern CA. Plenty of instability across the region, though deeper layer shear is on the lower side of things across our CWA, so anything that develops will have the potential to be strong/severe. Little change in the southwesterly flow aloft, with the main upper low moving into the southern ID area by evening.
731 PM EDT Sun Jun 11 2017 High pressure will remain in control of our weather bringing warm and dry conditions through tomorrow.
918 PM EDT Sun Jun 11 2017 High pressure will continue to extend into the Ohio valley from the mid Atlantic coast through Monday night.
1155 PM CDT Sun Jun 11 2017 Latest surface chart is not much different than yesterday, with high pressure now centered a little further east over the Carolinas and a frontal boundary draped over the northern Plains states. We will see dewpoints steadily creep to 70 degrees or even into the lower 70s bringing the real sticky feel back into the air. We will definitely be feeling the effects of this moisture, as heat index values jump into the lower 90s to possibly mid 90s in some locales as temperatures continue to be in the upper 80s.
Sustained winds will remain elevated overnight keeping temperatures in the lower 70s for the bulk of the forecast area but in the mid 70s in the most urbanized sections. 925 mb temps increase a few degrees celsius supporting highs a few degrees warmer than today for most areas.
Chattanooga Airport, TN 70 87 70 88 / 10 50 10 40 Knoxville McGhee Tyson Airport, TN 68 87 69 86 / 0 30 10 30 Oak Ridge, TN 68 88 70 88 / 0 30 10 30 Tri Cities Airport, TN 62 87 65 85 / 0 10 10 30.
Latest models focus the low level jet across the eastern Panhandle by midnight, leaving LBB and PVW with less wind shear potential. Warm and drier mid-level southwest flow aloft associated with the upper low will keep temperatures aloft very warm and should keep any widespread showers and thunderstorm development from occurring.
905 PM EDT Sun Jun 11 2017 High pressure has brought dry and warm weather for the start of the new week. Broad high pressure aloft and southerly boundary layer flow will maintain dry weather and more humid warmth through tonight.
Showers and thunderstorms are forecast to continue overnight as the much- discussed upper low moves east into Nevada.
731 PM EDT Sun Jun 11 2017 High pressure will continue to extend into the Ohio valley from the mid Atlantic coast through Monday night.
Shower and thunderstorm chances will end by late evening as an unseasonably cool upper trough currently over northern California begins to move to the east.
1036 PM EDT Sun Jun 11 2017 High pressure will continue to persist over the area maintaining fair weather through early this week, with temperatures slightly above normal. Upper ridge axis remains over the forecast area this evening with weaknesses along the Gulf Coast supporting diurnal convection. High pressure aloft will slide off the Southeast U.
Since the low level jet will be a bit weaker tonight than last night, ceilings will be slightly lower Monday morning than they were this morning.
538 PM MDT Sun Jun 11 2017 Updated Aviation Discussion A vigorous Pacific low pressure system will produce a moist, unstable flow aloft this evening over Southwest Montana. More showers and thunderstorms will develop over Southwest Montana as the low moves into the Great Basin Monday.
645 PM CDT Sun Jun 11 2017 High pressure over the southeast has maintained the quiet and warm weather pattern for the weekend.
High pressure ridge remains just north of the region with a weak pressure gradient over the waters.
817 PM EDT Sun Jun 11 2017 Aloft - a broad low/trough resides on the TX coast and western Gulf of Mexico while ridging reaches northward from Cuba/over FL/ to the Mid-Atlantic coast overnight. Surface - Atlantic high pressure ridges westward/ along the north side of Latitude 30/ to the central Gulf coast tonight as a remnant frontal trough slides from north-central to north Fl and dissipates. Atlantic high pressure ridges in north of the state through about midweek with east and southeast winds. The ridge axis begins to slip south and relax for the last half of the week with southeast to southwest winds.
944 PM EDT Sun Jun 11 2017 High pressure will continue to persist over the area maintaining fair weather through early this week, with temperatures slightly above normal. Upper ridge axis remains over the forecast area this evening with weaknesses along the Gulf Coast supporting diurnal convection. High pressure aloft will slide off the Southeast U.
714 PM EDT Sun Jun 11 2017 High pressure will continue to build into the area today maintaining fair weather, with temperatures slightly above normal. Due to increased insulation from the high clouds any fog would likely be patchy. High pressure aloft will slide off the Southeast U.
630 PM CDT Sun Jun 11 2017 Latest surface chart is not much different than yesterday, with high pressure now centered a little further east over the Carolinas and a frontal boundary draped over the northern Plains states. We will see dewpoints steadily creep to 70 degrees or even into the lower 70s bringing the real sticky feel back into the air. We will definitely be feeling the effects of this moisture, as heat index values jump into the lower 90s to possibly mid 90s in some locales as temperatures continue to be in the upper 80s.
Temperatures have been able to drop to the low to mid 80s but dew points were near 80 degrees, keeping humidity values high. A high pressure over the Atlantic Ocean tonight is extending westward across the southeast United States, allowing the local winds to flow from the east to southeast. These are expected to prevail through the mid week as the ridge gradually moves south towards central Florida.
908 PM PDT Sun Jun 11 2017 Strong onshore flow will continue through tonight, maintaining a deep marine layer and pockets of drizzle along and west of the mountains, while clear but windy conditions prevail across the higher mountains and deserts. A little warmer on Monday, then much warmer as we move through midweek.
/issued 307 PM CST Sun Dec 24 2017/ (Tonight and Christmas Day) A cold front quickly swept south through the area this morning into early afternoon, resulting in much cooler temperatures across west central Texas this afternoon. Tonight, as winds become light and variable, and a cooler air mass in place, expect lows to drop into the 20s across most of the area. Tomorrow, expect winds to quickly turn back to the south, as lee troughing quickly re-establishes itself. That, along with mostly sunny skies will allow temperatures to recover nicely by the afternoon hours into the low to mid 50s, with a few readings in the upper 50s also possible.
Cold front continues to surge south into Deep South Texas with front almost through the southern part of the offshore waters. Cold front pushing south through area along a line from Port O'Connor to near Orange Grove to Encinal.
A reinforcing cold front has moved south of the area with moderate northerly winds following in its wake. /issued 451 PM CST Sun Dec 24 2017/ A dry cold front is moving through the area this evening with winds becoming north. struggling into the lower 50s during the afternoon hours. By tomorrow evening moisture begins to return from the gulf riding up and over the cold frontal boundary.
426 PM MST Sun Dec 24 2017 Upper level analysis continues to show large trof over the northern CONUS with some ridging over the West Coast. At the surface, arctic high pressure in control, with next arctic front slipping south across ND.
Skies are clearing out behind a cold front and temperatures have fallen into the 40s except along the immediate coast. By tomorrow morning, expect to see temperatures at or below freezing in east Texas and central Louisiana, and the mid to upper 30s along the I-10 corridor of southeast Texas and southwest and south central Louisiana. A reinforcing cold front has moved south of the area with moderate northerly winds following in its wake. /issued 451 PM CST Sun Dec 24 2017/ A dry cold front is moving through the area this evening with winds becoming north. struggling into the lower 50s during the afternoon hours. By tomorrow evening moisture begins to return from the gulf riding up and over the cold frontal boundary.
Cold northwest flow aloft exists over the region, with upper low anchored over central Canada allowing for a continuous feed of cold air into the north central CONUS. Moisture content expected to range between a tenth and two tenths, but snow ratios should be on the high side as the temperature profile will straddle the cold side of the dendritic layer from the surface to near 600 mb.
A cold front in the Florida Big Bend region is moving slowly southeast but a gradual acceleration is indicated overnight as low pressure develops along the mid Atlantic coast and lifts northeast. Boating conditions will deteriorate behind a cold front in the north late tonight and across all of the waters on Christmas Day.
537 PM CST Sun Dec 24 2017 Transition for this Christmas Eve as Arctic cold front continues to approach. Already seeing some convective looking snow showers forming in parts of the region as weak short waves rotate into the area within larger upper trough.
Expect fair weather with above average temperatures through the holiday weekend as high pressure remains positioned along the west coast.
We are still expecting low temperatures below freezing for locations along and north of a line from Del Rio to Uvalde to Boerne to New Braunfels to Schulenburg. A strong cold front is pushing southward across the area with temperatures dropping to the upper 40s and lower 50s across the Hill Country in its wake. A cold and dry airmass will continue to push from the north into our area tonight with lows temperatures expected to reach the freezing mark across the Hill Country and the escarpment. Monday's high temperatures will come back to the lower and mid 50s after a freezing morning for much locations.
Cannot rule out a transition to some snow flurries primarily in the higher elevations given progged cooling thermal profiles, though not expecting impacts given saturation confined to 850mb and sfc temps mainly above freezing by the time the wave axis is east of the area (mainly after midnight). NW gradient winds have increased as expected, though the lower dewpts have been a bit slower given recent obs trend. There is a slight chance of sprinkles or flurries across extreme north GA this evening but no accumulation is expected except for maybe a dusting and in the higher elevations.
Cold front approaching from the northwest will be preceded by patchy fog, then accompanied by a few showers with mainly MVFR ceilings overnight for TPA, LAL, PIE, and SRQ.
Added a mention of slick roadways in the HWO and SPS overnight with temperatures quickly dropping below freezing as the cold front crosses the area. Chattanooga Airport, TN 25 37 28 47 / 20 0 0 10 Knoxville McGhee Tyson Airport, TN 26 34 26 43 / 30 0 10 10 Oak Ridge, TN 24 36 26 43 / 40 0 10 10 Tri Cities Airport, TN 25 32 22 37 / 60 0 10 10.
401 PM CST Sun Dec 24 2017 Through Christmas Day: After clouds eroded generally south of I-20 during the day, we're seeing them build southward again as a mostly dry secondary cold frontal passage occurs this afternoon. There are currently a few light showers and sprinkles across north MS associated with the front, and while a few of those may sneak into the Highway 82 corridor, it still appears any measurable rainfall will remain north of NWS JAN territory.
/issued 226 PM CST Sun Dec 24 2017/ A broad upper trough will reside over the CONUS for most of the upcoming week. This setup will result in periodic cold fronts moving south through the area and mainly dry weather. A cold front is currently moving south though the Trans Pecos of West Texas early this afternoon, leaving temperatures 20-25 degrees colder in it's wake compared with yesterday.
Cold front pushing south through area along a line from Port O'Connor to near Orange Grove to Encinal. A cold front continues on a southward track towards the Coastal Bend.
A strong upper level trough will cross the area this evening with scattered light rain and snow showers, resulting in mainly MVFR cigs, although CSV will have periods of IFR. The winds will become less gusty as well with high pressure slowly moving in on Christmas Day.
/EC/ Through Christmas Day: After clouds eroded generally south of I-20 during the day, we're seeing them build southward again as a mostly dry secondary cold frontal passage occurs this afternoon. There are currently a few light showers and sprinkles across north MS associated with the front, and while a few of those may sneak into the Highway 82 corridor, it still appears any measurable rainfall will remain north of NWS JAN territory.
Temperatures will slowly rise but remain below freezing in all areas until after the snow ends.
/issued 409 PM EST Sun Dec 24 2017/ Short Term (Tonight-Christmas Day): Patchy early morning fog will be likely on Christmas morning, mainly across interior and western areas as moisture increases ahead of an approaching cold front. The cold front will slowly pass through South Florida on Christmas Day, weakening as it does so. The weather is expected to remain quite pleasant tonight through Christmas Day, with mostly dry conditions and temperatures slightly warmer than normal.
Much colder conditions prevail today across the eastern plains behind a backdoor cold front.
451 PM CST Sun Dec 24 2017 A dry cold front is moving through the area this evening with winds becoming north. struggling into the lower 50s during the afternoon hours. By tomorrow evening moisture begins to return from the gulf riding up and over the cold frontal boundary.
Christmas day is looking sunny and chilly, under advancing high pressure.
As the trough to our east pulls away and the flow backs toward the west, this band of high cloud has made some eastward progress across OK this evening.
500 PM CST Sun Dec 24 2017 Canadian high pressure and dry air was moving into extreme southeast Kansas and the Missouri Ozarks this evening.
/issued 224 PM CST Sun Dec 24 2017/ This Christmas Eve brought an early day cold front complete with gusty northerly winds and chilly temperatures.
515 PM CST Sun Dec 24 2017 Mainly clear skies and cold temperatures were found across the region at 20Z with a high pressure ridge axis stretching from western Canada into the southern plains.
Winds will be gusty overnight; with the highest gusts topping out in the 25-30kt range.