Aikyam-Lab/Synoptic-Bench huggingface dataset:
445 AM PST Mon Feb 27 2023 A broad trough over the West will bring periods of light to moderate precipitation today and Tuesday.
The system is bringing light rain showers possibly freezing rain to the southeast part of the forecast area at 09z (2 am MST). Could see some patchy blowing snow in parts of northern Phillips and northern Valley Counties where temperatures remained below freezing yesterday.
Winds become more southerly to southwesterly around the dominating western Atlantic high pressure. Based on persistence, went towards the higher end of guidance with high temps, ranging generally from 85-90 across the area. We'll generally repeat the pattern on Tuesday, however with a bit more of a W/SW flow the east coast metro may be even a degree or two warmer.
328 AM MST Mon Feb 27 2023 The relatively moist southwesterly flow continues today as a broad trough sits over the Western US.
Issued by National Weather Service Little Rock AR 544 AM CST Mon Feb 27 2023 Showers and few thunderstorms today along a cold front. Temperatures into the low to mid 70s.
608 AM CST Mon Feb 27 2023 Today and Tonight: An upper trough that yielded severe weather across the southern plains yesterday will be pushing a front into our area today. Upper ridging in place is promoting warm mid level temperatures and should result in only scattered, shallow showers north of I-20 today. Tuesday through the weekend: The cool down will be quite short lived with temperatures Tuesday similar to the highs we see this afternoon: upper 70s F to lower 80s F.
253 PM CST Mon Feb 27 2023 Tonight and Tuesday: mid afternoon surface analysis had a cold front nearly along a line from Grenada to Vicksburg to Natchez. Isolated light showers will be possible along and ahead of the cold front as it sags slowly to the southeast this evening before stalling across our southern zones by morning. The stalled boundary will return north Tuesday as a weak warm front in response to a developing low pressure system over the Plains. No precipitation is expected with this warm front but moisture and temperatures will increase from the south.
Issued by National Weather Service Wakefield VA 314 PM EST Mon Feb 27 2023 A warm front will move north through the region by this evening, followed by a weak cold frontal passage from the west tonight. High pressure will build in from the Mid-Atlantic through mid- week.
Observations throughout the Keys reveal temperatures in the low 80s. The stout area of high pressure promotes dry conditions on the surface and aloft, resulting in a precipitable water value of 0.
Midday infrared satellite imagery revealed a perfectly clear sky over southwest Kansas and the adjoining region, with a very strong subsidence field behind the departing cyclone. There was no cold air tap behind this storm system, as such with some westerly downslope component, temperatures will warm easily into the lower to mid 60s this afternoon. Winds will trend light and variable around sunset, then light northeast tonight behind a very weak cold front.
Adv level snows are looking increasingly likely there, with localized warning levels possible depending on the track/speed of the low. If the track of the low shifts north, the stronger winds could affect portions of the central BH and Rapid City area. Snow will shift east Tues night with cooler conds expected Wed. Scattered snow showers may develop over northeastern WY into the higher Black Hills this afternoon into the early evening with local MVFR/IFR (including the KGCC terminal) conditions.
(This evening through Tuesday) Broad southwest flow will persist through the short-term period, contributing to lee troughing at the surface. Lows tonight will drop to the upper 30s in northern Oklahoma and the low 40s elsewhere with clear skies. Meanwhile, ERC values are not incredible, but poking into the 70th percentile range in a swath that collocates well with the lowest humidity.
Winds have certainly shown out today with the highest peak wind so far coming from Clarksville at 61 mph. Winds will be calm, temperatures will be in the low 70s, and skies will be mostly clear.
The segment from Ottawa to Ingham Counties expired at 3 pm as temperatures are above freezing and ice accretion on trees will be melting off while the roads appear to be clear, given normal travel flow speeds seen on I-96. Snow and freezing rain will become lighter as the elevated instability weakens and f-gen forcing translates east.
1044 AM MST Mon Feb 27 2023 The relatively moist southwesterly flow continues today as a broad trough sits over the Western US.
- Wintry mix of precipitation today - A strong low pressure system centered over northeastern Kansas early this morning will move ene and bring mixed pcpn to our area today. Pcpn will develop over our far sw fcst area around daybreak as a result of strong isentropic lift north of the warm front. P-type will be predominantly rain near to south of I-96 but a brief one to two hour period of -fzra and sleet is possible at the beginning of the event due to dynamical cooling and sfc temps near freezing. North of the I-96 corridor we expect freezing rain with potential for fzra accumulations on the order of a quarter to third of an inch.
151 PM CST Mon Feb 27 2023 Forecast Highlights: -Warmer than average afternoon temperatures are forecast through midweek. Water vapor aloft shows another storm system moving onshore over the Pacific Northwest and a low amplitude ridging pattern over the Rockies.
In general, the NBM has been superior compared to MOS with high temperatures of late and will lean toward it again today with just a slight nudge toward the warmer MOS values.
1144 AM CST Mon Feb 27 2023 Water vapor imagery currently shows a potent upper low lifting into Northern MO with an additional upper low approaching the Pacific Northwest. At the surface, low pressure is situated over extreme northeast KS and will be moving into northwest MO soon. By Fri afternoon there is good model agreement in the upper low moving out into west/central TX and into the Arklatex region by early Fri morning.
Evening mixed precipitation is possible in the Lower Treasure Valley as snow levels rise to just about 3000 feet MSL. A cold front will pass through our region late tonight, bringing brief heavy precipitation and breezy winds.
Issued by National Weather Service Little Rock AR 1147 AM CST Mon Feb 27 2023 Showers and few thunderstorms today along a cold front. Temperatures into the low to mid 70s.
A sunny and well mixed atmosphere will allow temperatures to maximize their potential today, with highs up into the low 70s for many areas.
High pressure is now centered across the southern Florida peninsula as troughing to the north has shifted the ridge slightly southward. Perhaps the most notable will be our slightly cooler temperatures compared to last week.
A cold front and upper-level trough that brought severe weather to parts of east Texas last night will continue to swing to the east today. The troughiness to our northwest has caused the strong ridge that has dominated the Key West weather the last several weeks to shift to the southeast. Raob observations reveals falling heights throughout the southeast and Florida Peninsula; upper-level heights will continue to decrease due to the the progressive trough currently to our northwest.
157 PM EST Mon Feb 27 2023 Low pressure will pass across the eastern Great Lakes tonight while a secondary low forms over southeast Virginia. Weak high pressure will return Tuesday night.
It will also be windy, and gusty winds will continue into tonight as cooler air moves into the region. A warm front moving up from the southwest is acting to quickly destabilize the atmosphere with temperatures south of US 6 rising into the 50s to low 60s with dewpoints also in the 50s. North of the warm front that airmass is still mostly stable and cool with temperatures only in the 30s to low 40s. Cooler, drier air will move in later this evening and overnight lows will be in the mid to low 30s, although skies will remain mostly cloudy under a mid-level inversion. High pressure will build into the region on Tuesday behind the departing low with west to northwest flow.
225 PM EST Mon Feb 27 2023 Showers and thunderstorms will taper off heading into this evening as a strong low pressure system shifts east across the lower Great Lakes. High pressure and drier conditions will build into the area on Tuesday.
Precipitation from this system should continue into this evening for locations east of the Twin Ports as an inverted trough pushes east. However, on the northwest side of this system, as typically happens, freezing drizzle may be a threat into the evening so will have to watch for that. We'll get a brief break Tuesday morning as high pressure quickly crosses until Tuesday evening when the next clipper system begins to arrive from the west. Being on the northern side of this jet will keep us in a cooler air mass through the week, but this should be right about normal. IFR to LIFR conditions under freezing precipitation which should become predominately snow this afternoon before the system pulls away this evening.
We'll be a touch colder tonight in the absence of downslope flow across the lower elevations, with lows mostly in the 20's and locally the teens along the South Platte River Valley, with teens and single digits in the mountains.
526 PM CST Mon Feb 27 2023 (This evening through Tuesday) Broad southwest flow will persist through the short-term period, contributing to lee troughing at the surface. Lows tonight will drop to the upper 30s in northern Oklahoma and the low 40s elsewhere with clear skies. Meanwhile, ERC values are not incredible, but poking into the 70th percentile range in a swath that collocates well with the lowest humidity.
As a deep trough settles in aloft, strong showers have continuously moved onshore today. This will bring 2 to 6 inches of snow to the highest elevations of 101 in Mendocino County.
The powerful low pressure system that was responsible for the rain showers in central Neb and strong winds this morning areawide has raced off to the Great Lakes.
(The rest of tonight) A quiet night is on tap even with a weak cold front set to move into portions of northeast Oklahoma and northwest Arkansas later tonight.
Expect breezy and cool conditions through Tuesday, with some low clouds and flurries at times over the higher terrain.
634 PM EST Mon Feb 27 2023 Showers and thunderstorms will taper off heading into this evening as a strong low pressure system shifts east across the lower Great Lakes. High pressure and drier conditions will build into the area on Tuesday.
525 PM CST Mon Feb 27 2023 Tonight and Tuesday: mid afternoon surface analysis had a cold front nearly along a line from Grenada to Vicksburg to Natchez. Isolated light showers will be possible along and ahead of the cold front as it sags slowly to the southeast this evening before stalling across our southern zones by morning. The stalled boundary will return north Tuesday as a weak warm front in response to a developing low pressure system over the Plains. No precipitation is expected with this warm front but moisture and temperatures will increase from the south.
Issued by National Weather Service Denver CO 308 PM MST Mon Feb 27 2023 A trough off the west coast inches closer to western Colorado this evening. Ahead of the trough a fair amount of moisture advects into the area with west-southwest flow.
Forecast Highlights: -Warmer than average afternoon temperatures are forecast through midweek. Water vapor aloft shows another storm system moving onshore over the Pacific Northwest and a low amplitude ridging pattern over the Rockies.
Precipitation from this system should continue into this evening for locations east of the Twin Ports as an inverted trough pushes east. However, on the northwest side of this system, as typically happens, freezing drizzle may be a threat into the evening so will have to watch for that. We'll get a brief break Tuesday morning as high pressure quickly crosses until Tuesday evening when the next clipper system begins to arrive from the west. Being on the northern side of this jet will keep us in a cooler air mass through the week, but this should be right about normal.
Winter Weather Advisories have been issued for the Kootenai/Cabinet Region (Libby, Troy, The Yaak, Bull Lake, Koocanusa Area), Lower Clark Fork Region (focusing on locations near the Idaho border such as Heron, Trout Creek, Lookout Pass, Haugan), West Glacier Region (West Glacier, Hungry Horse, Polebridge).
Lingering effects from snow and freezing rain late this evening will primarily maintain the slick road conditions. The segment from Ottawa to Ingham Counties expired at 3 pm as temperatures are above freezing and ice accretion on trees will be melting off while the roads appear to be clear, given normal travel flow speeds seen on I-96. Snow and freezing rain will become lighter as the elevated instability weakens and f-gen forcing translates east.
955 PM EST Mon Feb 27 2023 Gusty winds will continue into the overnight as cooler air moves into the region. A warm front moving up from the southwest is acting to quickly destabilize the atmosphere with temperatures south of US 6 rising into the 50s to low 60s with dewpoints also in the 50s. North of the warm front that airmass is still mostly stable and cool with temperatures only in the 30s to low 40s. Cooler, drier air will move in later this evening and overnight lows will be in the mid to low 30s, although skies will remain mostly cloudy under a mid-level inversion. High pressure will build into the region on Tuesday behind the departing low with west to northwest flow.
Another pleasant evening across the area with high pressure to the south and a storm system moving by well to the north. This system to the north will push a weakening cold front into the southeast states tonight and Tuesday which could allow for a couple of showers to move across north Florida including Levy county late tonight into early Tuesday morning. High pressure is now centered across the southern Florida peninsula as troughing to the north has shifted the ridge slightly southward. Perhaps the most notable will be our slightly cooler temperatures compared to last week.
High pressure will pass across the area Tuesday resulting in dry weather and much more calm conditions. However a warm front is slated to lift north across the region, with increasing clouds and mild temperatures.
544 PM CST Mon Feb 27 2023 (Tonight through Tuesday night) A very weak, Pacific cold front has made its way into far western portions of the CWA this afternoon.
354 PM CST Mon Feb 27 2023 The powerful low pressure system that was responsible for the rain showers in central Neb and strong winds this morning areawide has raced off to the Great Lakes.
346 AM EST Tue Feb 28 2023 A cold front will move offshore early today. High pressure will build in from the Mid-Atlantic through mid-week.
140 AM EST Tue Feb 28 2023 A cold front will move offshore early today. High pressure will build in from the Mid-Atlantic through mid-week.
Mild temperatures will continue today despite yesterday's cold front passage. High pressure will be drifting east across the OH Valley/lower Great Lakes through the day, with a nearly zonal flow aloft. With full sun today, highs are expected to range from the lower/mid 70s south and central to mid/upper 60s north. A southerly low level flow develops tonight as the high moves into the Mid Atlantic region, and a low tracks into the upper MS region.
In fact, some cu have recently redeveloped along this bndry from Cntrl LA into Cntrl MS, but the lack of any pressure gradient overnight should maintain this bndry in place, thus preventing the slow Nwd advection of the low stratus that has just developed farther to the S along and just N of the I-10 corridor.
Clearing skies as a result of the influence of high pressure will work in tandem with the warm air advection to produce well above average temperatures tomorrow afternoon.
1035 PM CST Mon Feb 27 2023 (Tonight through Tuesday night) A very weak, Pacific cold front has made its way into far western portions of the CWA this afternoon.
1024 PM EST Mon Feb 27 2023 Strong low pressure will track northeast into the Great Lakes with strong winds diminishing and lingering rain showers coming to an end overnight. High pressure and drier conditions will build into the area on Tuesday.
1240 AM EST Tue Feb 28 2023 A cold front will move offshore early today. High pressure will build in from the Mid-Atlantic through mid-week.
110 AM EST Tue Feb 28 2023 Strong low pressure will track northeast into the Great Lakes with strong winds diminishing and lingering rain showers coming to an end overnight. High pressure and drier conditions will build into the area on Tuesday.
Cold frontal passage this evening brought a mix of rain and snow to the Kuna and Meridian with heavy snow from Boise through Twin Falls. Temperatures will drop below freezing by mid night which could cause some icy road conditions tonight. More snow is possible Tuesday afternoon and evening as the upper level low traverses the forecast area.
241 AM EST Tue Feb 28 2023 Gusty winds will continue the rest of the night as cooler air moves into the region.
/EC/ Tonight and Tuesday: mid afternoon surface analysis had a cold front nearly along a line from Grenada to Vicksburg to Natchez. Isolated light showers will be possible along and ahead of the cold front as it sags slowly to the southeast this evening before stalling across our southern zones by morning. The stalled boundary will return north Tuesday as a weak warm front in response to a developing low pressure system over the Plains. No precipitation is expected with this warm front but moisture and temperatures will increase from the south.
Mean layer ridging remains over Cuba and the Bahamas, which continues to dominate our sensible weather. Otherwise, high temperatures once again reached into the lower to mid 80s with dew points thankfully comfortably in the 60s this afternoon. Light winds and clear skies have allowed localized areas on Big Pine Key to plummet into the lower 60s this hour. Elsewhere, temperatures are holding in the lower 70s.
1146 PM EST Mon Feb 27 2023 Rain showers will diminish tonight in wake of the passing low pressure system.
140 AM MST Tue Feb 28 2023 Satellite imagery showed an upper trough deepening over the Pacific Northwest. A piece of the trough will kick across southern Montana and northern Wyoming and be the primary weather maker the next 36 hours. The inverted trough lingers through the night tonight.
358 AM EST Tue Feb 28 2023 Low pressure will lift away from the region today and high pressure will build in from the midwest tonight.
1050 PM CST Mon Feb 27 2023 (This evening through Tuesday) Broad southwest flow will persist through the short-term period, contributing to lee troughing at the surface. Lows tonight will drop to the upper 30s in northern Oklahoma and the low 40s elsewhere with clear skies. Meanwhile, ERC values are not incredible, but poking into the 70th percentile range in a swath that collocates well with the lowest humidity.
1045 PM CST Mon Feb 27 2023 (The rest of tonight) A quiet night is on tap even with a weak cold front set to move into portions of northeast Oklahoma and northwest Arkansas later tonight.
A modest downslope regime will develop during the day amidst lee troughing across the western terrain. This front is expected to be dry, with a northwesterly wind shift and a "cooler" (seasonable) airmass expected to be the primary sensible impact.
Today will be a dry and sunny day with temperatures in the low to mid 70s.
558 AM CST Tue Feb 28 2023 (Today) High pressure will build into the Tennessee Valley today, promoting absolutely beautiful weather for this last day of February. The combination of light southeast flow, ample sunshine, and a warm/dry air mass will help to push temperatures into the 75 to 80 degree range once again -- and it's possible temperatures may be a little underdone, with a few locations potentially reaching the lower 80s.
832 AM EST Tue Feb 28 2023 High pressure along with mostly clear skies and warm temperatures will be over the region through Wednesday.
240 AM MST Tue Feb 28 2023 Upper level ridge moves to the east this morning.
(Today through Wednesday) Models continue to depict deep high pressure dominating most of the Caribbean and the western Atlantic. This will keep a rather warmer than normal weather pattern across SoFlo, with little to no rain in sight for the short term period. Coastal/metro areas will likely reach the upper 80s, while interior areas possibly hitting the lower 90s.
Issued by National Weather Service Little Rock AR 516 AM CST Tue Feb 28 2023 Today will be a dry and sunny day with temperatures in the low to mid 70s.
This evening, a warm front to our south will lift northeastward. By tomorrow morning, a cut-off low will develop over NV/CA with moisture continuing to feed northward into Idaho, but snow amount look fairly light through tomorrow evening.
629 AM EST Tue Feb 28 2023 (Today through Wednesday) Models continue to depict deep high pressure dominating most of the Caribbean and the western Atlantic. This will keep a rather warmer than normal weather pattern across SoFlo, with little to no rain in sight for the short term period. Coastal/metro areas will likely reach the upper 80s, while interior areas possibly hitting the lower 90s.
925 AM EST Tue Feb 28 2023 Weak high pressure will build in from the Mid-Atlantic through mid- week. A warm front will light north through the area Wednesday.
Currently, an upper level low pressure system is situated across Manitoba with a trough extending south east across North Dakota and northern Minnesota. An upper level trough has begun to push onshore across the PNW. At the surface, high pressure is situated across eastern Nebraska.
Elsewhere, temperatures have primarily remained in the lower to mid 70s with 75 degrees at Key West International Airport, 72 degrees at Marathon and 69 degrees at Ocean Reef. Deep mean layer ridging remains in place across the Florida Keys with the center of this ridge south of the area over Cuba and the Central to Southeast Bahamas.
451 AM PST Tue Feb 28 2023 Another cold low pressure system from the northwest will bring mostly lighter showers early this morning, then more widespread showers for tonight and Wednesday with the heavier precipitation late tonight into Wednesday morning and in the mountains.
Highs are expected in the lower to mid 80s, with some readings in the upper 80s in the Northwest Hill Country.
At the surface, high pressure is situated through the Missouri Valley with a weak cold front extending from far southern MO through northern OK. By 12z Thu, the powerful upper low will be tracking into the Desert Southwest and will eject out into the Southern Plains for Thu night into Fri morning.
The high latitude blocking will maintain a strong WSW band of westerlies across the CONUS. The WSW upper flow will generally result in AOA normal temperatures, though a cooler day or two will be mixed in as well.
A cold front will continue to cross southern Utah through this morning.
504 AM CST Tue Feb 28 2023 Cooler today amid lingering clouds and a gentle north wind. Temperatures bounce warmer by Wednesday as a frontal system lifts through the region. It's not until this afternoon that a subtle ridge of drier high pressure builds in from the west, but even then, high clouds will begin filtering in atop of it from the south. The exception could come south of I-70 where deeper PBL mixing helps tap those warmer 850mb readings. As a cold front sweeps through central Illinois Wednesday evening, ensemble guidance reveals a low chance (< 30%) of light rain south of I- 70 where vertical profiles are just wet enough to support a few hundredths.
Key message : Warm and windy Today, Cold front Tonight leaving Fall like conditions Wednesday.