Aikyam-Lab/Synoptic-Bench huggingface dataset:
As the upper low SE of RNO drops Swd into the SJV, overnite and Mon, the pressure gradients should continue to tighten with the 925 mbs winds peaking 12-18z Mon before relaxing Mon afternoon. JHM A low pressure system forecast to dig south across the CA/NV border today has brought gusty winds and high clouds to northern California this afternoon. Gusts of 50+ mph are possible over the Sierra particularly in wind favored gaps and ridges. Gradients are forecast to relax by Tuesday as the low pushes out of the forecast region. In its wake, we will see slightly warmer conditions due to the downslope flow that will cause adiabatic heating over interior northern California early this week.
1053 PM CST Sun Dec 6 2020 (This evening through Monday) No significant weather issues tonight or tomorrow as the area remains under northwest flow aloft between the exiting storm system and the upper ridge developing from the southern High Plains to the northern Rockies. The biggest local influence will remain the remnant snowpack keeping high temperatures much cooler in far northwest Oklahoma again on Monday.
1243 AM EST Mon Dec 7 2020 Some light snow is possible tonight and Monday with crossing low pressure. An upper low is expected to track from the Midwest toward the Upper Ohio Valley region overnight. The best chance for any minimal accumulation is across the WV ridges, where slightly deeper moisture and ascent is progged. Elsewhere, a lack of moisture above the low levels should preclude more than very light, patchy snow/flurries.
1018 PM MST Sun Dec 6 2020 Latest water vapor imagery shows an upper low over the Pacific Northwest, a skinny ridge over the Rockies, and northerly flow bringing some high level moisture into the Northern Plains. At the surface, high pressure remains over the area with temperatures mainly in the 50s, with a few 60s around the eastern foothills. A more unsettled, progressive pattern sets up the second half of the week, resulting in cooler temperatures and some chances for showers. The upper low over the Pacific Northwest will begin to drop south into the Desert Southwest, before strengthening Monday Night and Tuesday to the west of the Baja Peninsula. This will allow the upper ridge to build over the Western High Plain in northwest flow.
low clouds and patchy fog over northeast Kansas early this morning may brush portions of southeast Kansas as they drift south and eastward across the area, however most of the low clouds and fog are expected to remain immediately east of our forecast area.
330 AM CST Mon Dec 7 2020 High pressure will settle over the area with cool dry conditions through at least Wed.
At the surface, weak troughing will be over much of the central part of the country today and tonight, becoming even more reinforced over the region on Tuesday as low pressure slides from central Canada to Hudson Bay. Highs on Tuesday will range from the lower 50s east to the lower to mid 60s west.
Areas in central MO will have clouds for most of the day keeping highs in the low to mid 40's. Ridging has built up along the eastern Rockies cementing dry NW flow for the next couple of days. A LLJ streak pushes a thermal boundary advecting warmer air into our region.
An extensive cloud shield was centered almost entirely over southern Nevada and nearby areas on the south and east sides of a low pressure system which was centered along the central Nevada/California border and diving toward the SoCal Coast. The lowest moisture wrapping around the clockwise circulation of the upper low will concentrate primarily over Inyo County early this morning and a brief dusting of snow will be possible in the Sierra and White mountains there until about 10 AM PST. Clouds will clear from east to west this afternoon allowing mostly sunny skies to return to all but San Bernardino County and maybe the lower Colorado River Valley. North-northeast winds will increase today and continue tonight and Tuesday as the pressure gradient tightens in response to the closed low spinning off the SoCal Coast.
547 AM CST Mon Dec 7 2020 Under the influence of surface and upper-level high pressure, stable conditions to prevail across the ArkLaTex today with VFR conditions and northwest winds less than 10 knots. At the surface, high pressure centered over the plains to continue to build eastward into the ArkLaTex with northwest winds around 5 mph. Temperatures through the short term to range from highs in the mid to upper 50s today with overnight lows in the low to mid 30s.
Temps today will stay in the low 30s due to this cloud cover. Cloud cover persists through tonight and into tomorrow morning before high pressure builds over the area Tuesday.
/issued 339 AM CST Mon Dec 7 2020/ A cold front presently bisects the region roughly just to the north of the I-10 corridor although you wouldn't know it looking at the clear satellite this morning. High pressure at the surface and the eastern fringes of an upper level ridge centered across the western U.
/issued 400 AM CST Mon Dec 7 2020/ Dry conditions will continue for most of the upcoming workweek with warmer temperatures. A deep trough over the eastern half of the Nation with a ridge over the Pacific Northwest early in the week will gradually deamplify as a cutoff low shifts onshore in western Mexico. Downstream, a ridge will build over the Plains and Mississippi river valley.
As this area of showers also pushes eastward, we will see gradual clearing conditions through the afternoon hours as cooler and more stable air filters into the area.
A deep cutoff low will remain to our west throughout the short term period and while some clouds will form near this low.
The upper trough will continue to slowly move east through the day.
Weak mid level ridging will provide subsidence over deep South Texas through the short term. High temperatures this afternoon should range from the mid 60s along the beaches to the low to mid 70s inland. Lows tonight are expected to fall into the low to mid 40s at most locations. Tuesday will be slightly warmer with highs from around 70 near the coast to the mid or upper 70s inland.
As a result, Tuesday's high temps are expected to be slightly warmer than today's despite scattered to broken clouds remain for much of the day. Pfahler During the second half of the week, an upper-level ridge will quickly shift eastward into the eastern U. Global model guidance agree that a cutoff cyclone previously associated with the Rex block will also become ejected northeastward from the southwestern U. as it interacts with a northern stream upper-level trough.
343 AM CST Mon Dec 7 2020 A narrow upper level ridge axis extending from Idaho and western Montana to South Texas will remain in place today and tonight. Fair weather and generally light north to northwest surface winds will result in low temperatures near average despite the warmer than average highs this afternoon.
High pressure will settle over the Northern Great Basin as a weak low pressure system drops through the Southern Great Basin today. A trough arriving past mid week may aid in mixing out or weakening valley inversions. With high pressure in control aloft inversions will continue to plaque the basins and valleys with temperatures the main challenge. Hazy/light inversion fog conditions being reported at the KSLC and this is likely to continue during the overnight and morning hours until relief comes later in the week with a trough passage.
Mesoanalysis and 00Z RAOB flight data indicated a high amplitude trof over the Upper Midwest, w/ strong Nrly upper flow extending over the MS River Valley, w/ the basin of the trof extending S/W-wrd over the S/Ern US. Freezing or near freezing temperatures will be seen across the state in most locations this morning. Under synoptic scale forcing for descent invof the upstream portion of an H500 trof, settled wx will continue over the region Mon w/ increasing clouds over the N/E being the main topic of discussion. A similar day will unfold w/ warming temps into the low 60s and below ChC PoPs again as upper troughing shifts Ewrd, and Wrn US ridging begins to break down.
915 AM EST Mon Dec 7 2020 After a cloudy Monday with a few flurries and patch freezing drizzle in the Columbus area, drier air will work into the Ohio Valley.
Increased warm/dry-air advection over the lower few thousand feet overnight has aided in mixing the fog and stratus east at a steady rate per observations and nighttime microphysics satellite imagery. Sub-freezing temps with this fog/high RH boundary layer may lead to slick bridges and overpasses.
854 AM CST Mon Dec 7 2020 A cold and breezy day forecast as a cold front exits to the south and east. Northerly to northwesterly winds will be gusty throughout the day with highs only climbing into the low to mid 40s. These combination of factors, will keep wind chill values in the low to mid 30s throughout the day. Additionally, clouds will increase across the area late this morning and afternoon as they rotate southward into the area as a mid-level trough pivots across the Tennessee Valley. As the upper-trough pulls away from the Tennessee Valley this evening, expect winds to relax and the sky to clear. The end result should be an excellent setup for radiational cooling and expect temperatures to fall back into the low to mid 20s by early Tuesday morning.
The overall pattern remains mostly unchanged with broad cyclonic flow over the eastern third of the CONUS and meridional flow between the troughing and persistent ridge out west. At the deck's edge, patchy freezing fog - dense in areas - has developed. Have opted to post a FREEZING FOG ADVISORY from Gage County to Pottawattamie County and areas south and east.
322 AM CST Mon Dec 7 2020 Currently the FA is under northerly flow aloft with a mid to upper level low over northeastern CA and northwest NV. The eastern Oklahoma Panhandle still has some snow covered ground keeping this area a few degrees cooler than surrounding areas.
Overall pattern remains the same with ridge building in the western, flattening as we head through the early part of the week.
The high pressure ridge has become weaker over the past 24 hours, resulting in some recession of the persistent freezing fog and stratus across NW Montana.
Cut-off inside slider low pressure system is dropping southwest over the Sierra from Nevada early this morning. The strongest winds will be on the top side quadrant of the low or a few hundred miles north of the low center. A wind advisory is in effect trough 4 pm for many areas with speeds from 30 to 40 mph, gusts to 55 mph expected. Upper low will drop to off the SoCal coast this evening with the gradient relaxing, which will allow the winds to diminish. Upper ridge will set up behind the system with northwest flow into the end of the week.
339 AM CST Mon Dec 7 2020 A cold front presently bisects the region roughly just to the north of the I-10 corridor although you wouldn't know it looking at the clear satellite this morning. High pressure at the surface and the eastern fringes of an upper level ridge centered across the western U.
upper level low pressure will continue south out of the Great Basin, into southern California, with upper level high pressure remaining in place across Colorado. With clear skies and light winds forecast again tonight, temperatures will fall back into the lower 20s across the Plains, and single digits over the San Luis Valley.
A storm system will bring cooler temperatures, gusty winds and a good chance of valley rain and mountain snow showers later this week.
This combined with the cooler air and lighter winds, has allowed patchy fog to develop. High pressure sets up shop.
A weak mid to upper level ridge will be over south Texas as an upper trough swings through the southeast United States and a cutoff upper low over the southwest United States moves south to west of northern Baja California Tuesday. Highs today will be near normal with readings about 4-5 degrees warmer on Tuesday.
400 AM CST Mon Dec 7 2020 Dry conditions will continue for most of the upcoming workweek with warmer temperatures. A deep trough over the eastern half of the Nation with a ridge over the Pacific Northwest early in the week will gradually deamplify as a cutoff low shifts onshore in western Mexico. Downstream, a ridge will build over the Plains and Mississippi river valley.
/issued 343 AM CST Mon Dec 7 2020/ A narrow upper level ridge axis extending from Idaho and western Montana to South Texas will remain in place today and tonight. Fair weather and generally light north to northwest surface winds will result in low temperatures near average despite the warmer than average highs this afternoon.
540 AM CST Mon Dec 7 2020 (Today and tonight) A narrow upper level ridge axis will extend from the northern Rockies down into west Texas today.
(Today and tonight) A narrow upper level ridge axis will extend from the northern Rockies down into west Texas today.
The upstream ridge is now flopping over into the Pacific Northwest. Inversions have set up over the valleys with breezy conditions over the ridges. Lingering low level moisture, light winds and some clearing of skies are resulting in areas of valley fog and freezing fog that will persist into Monday morning. The low clouds and fog will return for another round Monday night into Tuesday as the next front will be delayed a bit. Southwest flow aloft will set up over the Pacific Northwest Tuesday with weak troughs moving through. The next trough will push a front onshore Tuesday into Tuesday night. There will also be a slight chance of precipitation over the higher terrain east of the Cascades. Snow won't be a significant factor with snow levels above all but the highest peaks.
A light north to northwest wind will occur today as high pressure slowly builds into the area. A weak mid to upper level ridge will be over south Texas as an upper trough swings through the southeast United States and a cutoff upper low over the southwest United States moves south to west of northern Baja California Tuesday. Highs today will be near normal with readings about 4-5 degrees warmer on Tuesday.
/Issued 322 AM CST Mon Dec 7 2020/ Currently the FA is under northerly flow aloft with a mid to upper level low over northeastern CA and northwest NV. The eastern Oklahoma Panhandle still has some snow covered ground keeping this area a few degrees cooler than surrounding areas.
The center of an upper level low pressure system is currently tracking southwestward over central California and easterly flow is beginning to increase across the northern portion of our Sierra zones. The upper low is progged to continue its southwestward trek today and end up near 30N/120W by early Tuesday morning. The High Wind Warning remains in effect there through 10 PM tonight. Although easterly flow will decrease by tonight as the low moves away, persisting dry conditions over the mountains south of Kings Canyon will be sufficient to keep the Red Flag Warning in place through Tuesday.
Winds have overachieved a bit in some of the higher elevation observations sites such as Five Mile, CA where gusts up to 70 mph have been seen. However, with the low quickly exiting southwest today per latest satellite trends, this should be very isolated and decrease through the rest of the day. Cloud cover should also decrease throughout the day as moisture and lifting push southwest with the low center. Winds will continue to decrease Tuesday as the closed low pushes well off shore of California and broad southerly flow at 500 mb returns and the resultant surface gradient relaxes.
Subsidence on the back side of the mid level trough currently located across much of the eastern half of the country will continue to overspread the area today allowing for clear skies, warm temperatures, and light westerly winds.
An upper level trough will result in mainly cloudy skies today with NW winds around 10KT. High pressure will move in tonight with clearing skies and light winds.
348 PM EST Mon Dec 7 2020 Deepening low pressure will pass well south and east of the area through Tuesday, followed by weak high pressure nudging in from the southwest Tuesday night.
Otherwise, trough axis has moved east of the area and the wind shift to northwesterly flow has begun as a clipper dives down into the area. SR Chattanooga Airport, TN 28 48 28 56 34 / 10 0 0 0 0 Knoxville McGhee Tyson Airport, TN 27 44 27 52 34 / 10 0 0 0 0 Oak Ridge, TN 26 44 27 52 33 / 10 0 0 0 0 Tri Cities Airport, TN 24 40 24 48 31 / 10 0 0 0 0 TN.
1139 AM CST Mon Dec 7 2020 A piece of upper level energy is rotating around the 500mb upper low located over the upper Ohio Valley and through the Mid- South. Temps will be colder than normal this afternoon with highs in mid 40s toward Paris ranging to the lower 50s in the Delta SW of Memphis with a northwest wind around 10 mph. /issued 400 AM CST Mon Dec 7 2020/ Dry conditions will continue for most of the upcoming workweek with warmer temperatures. A deep trough over the eastern half of the Nation with a ridge over the Pacific Northwest early in the week will gradually deamplify as a cutoff low shifts onshore in western Mexico. Downstream, a ridge will build over the Plains and Mississippi river valley.
A deep upper trough is located over the eastern U. Some isolated fog/freezing fog is possible late mainly near bodies of water.
Fairly cold temperatures expected tonight, with freezing temperatures (28-32 degrees) over most of the interior, extending all the way down to the I-10 corridor with mid and upper 30s closer to the coast (and even a few low 40s along immediate coast and barrier islands).
243 PM EST Mon Dec 7 2020 Water vapor imagery highlights a long-wave trough pivoting through the southeastern United States, north of a deep belt of southwesterlies racing across Florida and the western North Atlantic. A cold front has pushed southeast through the Gulf of Mexico, now through Naples, the Dry Tortugas, and Smith Shoal, soon to be through the island chain. High temperatures today were limited to the mid 70s, and dewpoints have been in the upper 60s since the prefrontal trough rolled through this morning. Northwest to north winds will increase sharply in the next couple hours as the cold front clears the Keys.
139 PM EST Mon Dec 7 2020 An upper level low will pass through the area tonight. High pressure will gradually build over the region during the second half of the week.
Hoping to break out into some sunshine during the day Tuesday as mid/upper level ridging begins to take place.
Winds should remain between 5 and 10mph, but sheltered valley locations across our northern counties may allow temps to drop into the low to mid 20s, as opposed to the upper 20s to lower 30s elsewhere.
Issued by National Weather Service El Paso Tx/Santa Teresa NM 1149 AM CST Mon Dec 7 2020 (Today and tonight) A narrow upper level ridge axis will extend from the northern Rockies down into west Texas today.
Mostly clear skies with occasional passing high clouds are expected over the next 24 hours as high pressure begins to settle in, which will allow VFR conditions to prevail over the next 24 hours. Weak mid level ridging will provide subsidence over deep South Texas through the short term. High temperatures this afternoon should range from the mid 60s along the beaches to the low to mid 70s inland. Lows tonight are expected to fall into the low to mid 40s at most locations. Tuesday will be slightly warmer with highs from around 70 near the coast to the mid or upper 70s inland.
In fact, temperatures have still not risen above the freezing mark on the Plateau and have only reached the mid 30s to low 40s elsewhere. Cloud cover and sizable dewpoint depressions should keep fog from forming overnight, but cannot rule out some freezing fog near our rivers and lakes if clouds can clear out enough. Warming trend will begin tomorrow as a weak upper level ridge builds over the Southern Plains, then shifts eastward into the Gulf Coast states.
114 PM MST Mon Dec 7 2020 Water vapor shows broad ridge over the western/central CONUS with trof offshore the Pac NW. Surface trof is pushing into the Upper Midwest with strong ridge over the Rockies.
High pressure will continue through Wed, then a very weak trough passing to the north on Wed night will bring a very low chance of precipitation to the ID- MT border region, with little effect anywhere else.
/issued 547 AM CST Mon Dec 7 2020/ Under the influence of surface and upper-level high pressure, stable conditions to prevail across the ArkLaTex today with VFR conditions and northwest winds less than 10 knots. At the surface, high pressure centered over the plains to continue to build eastward into the ArkLaTex with northwest winds around 5 mph. Temperatures through the short term to range from highs in the mid to upper 50s today with overnight lows in the low to mid 30s.
The upper-level ridge that's responsible for our well above average temperatures this past week will remain in place through mid-week, but it will finally begin to broaden and flatten, signaling at least a modest change in the pattern.
Tonight through Tomorrow Night In the upper levels, the Panhandles will be found under a ridge of high pressure between a cutoff low moving southwest off of the southern California coast and a closed low moving through the northeast U. On the surface, high pressure will slowly sink southward across eastern New Mexico which will turn our northwest winds tonight more to the southwest by Tuesday evening.
/Tonight through Monday/ *Fog/freezing fog expected to redevelop over large parts of central/western Iowa tonight while stratus sticks around. While predominantly quiet, there will be some impactful conditions, namely fog/freezing fog, across large swaths of central and western Iowa again tonight and into Tuesday morning. Stratus should see some westward expansion tonight, and greatest fog/freezing fog potential will be along/west of I-35 tonight. Fog/freezing fog and stratus should improve fairly quickly Tuesday mid-late morning as WAA surface flow out of the west increases and near-surface flow from the northwest advects in drier air.
125 PM CST Mon Dec 7 2020 Tonight looks similar to last night as temperatures fall below freezing with fog and low clouds over portions of the area, especially toward Central MO. Have included a mention of fog and potential for slick spots on bridges in the HWO. Tuesday will be just a little warmer than today with highs in the 50s (maybe upper 40s toward central MO where clouds and fog linger longest).
Very pleasant weather continues as surface ridging dominates the region through Tuesday night. Just a few cirrus are expected tomorrow on the edge of weak upper ridging.
Consolidation of separate pv anomalies underway across the northern Ohio valley early this morning, this process ensuring the western expanse of high amplitude eastern conus troughing remains a fixture over the next 24 hours. Reorientation of the upper height field will also afford a brief westward drift of the lake Huron aggregate trough early today. An incremental increase in upper level heights commence mid week as predominant large scale troughing relinquishes control to the east.
231 PM CST Mon Dec 7 2020 A broad upper level ridge currently extends across the western CONUS with a closed low off the coast of southern CA. This upper ridge will flatten out Tuesday night across the region as an upper trough pushes into the Pacific NW. Again, went with the high end of guidance for highs with highs around 65 areawide.
Clear skies, dry conditions, and high pressure overhead will maintain above normal high temperatures and near normal overnight lows. The closed low to our west will continue its journey southwestward, leaving the CWA anchored under the ridge of high pressure for the next 48 hours. Favored cold pools across the CWA may dip blew zero, or at best, hover in the low-single digits tonight and again Tuesday night.