Aikyam-Lab/Synoptic-Bench huggingface dataset:
1145 PM CST Wed Jan 4 2023 00Z upper air analysis places an upper level trough over the Plains and Mississippi Valley with amplified upper level ridging over the Rockies. Meanwhile, surface analysis places a ridge of high pressure over the Southern Plains and yesterday's cold front located over the Appalachians.
1030 PM MST Wed Jan 4 2023 Water vapor shows nearly stationary upper low over the Upper Midwest, ridge building into the Northern Rockies, and strong upper low offshore the west coast. At the surface, low is over southeast MN with weak/broad high pressure over the western Dakotas. Upper ridge currently building into the Northern Rockies will slow translate east the next couple of days as upper trof affects the west coast.
901 PM PST Wed Jan 4 2023 The arrival of a frontal system tonight into Thursday will produce a swath of mixed precipitation in the form of snow, rain, and freezing rain across central and northeast Washington.
933 PM MST Wed Jan 4 2023 Satellite images and weather sensors are reporting areas of dense freezing fog in the Wind River Basin. Leave extra time if driving, and beware of slick spots due to fog freezing on surfaces. These will mostly end this afternoon as a ridge crosses the region, but right behind it, another trough will enhance the shower activity once again.
1047 PM CST Wed Jan 4 2023 (Tonight through Thursday night) An upper level ridge over the Rockies tonight will move into the plains by Thursday night.
228 AM CST Thu Jan 5 2023 Today: Stubborn closed low currently situated over eastern IA slowly wobbles eastward today, putting an end to any meaningful snowfall by daybreak.
115 AM MST Thu Jan 5 2023 Upper ridge axis will move across the Rockies and adjacent central High Plains today and tonight.
1052 PM CST Wed Jan 4 2023 A general persistent pattern is likely to continue over the next 24- 36 hours with the mid/upper level low currently over the Upper Midwest slowly moving eastward. Further west/south, some sunshine is likely by the afternoon which should allow temperatures to warm up into the low to mid 40s. These cooler readings will be aided by at least some decrease in cloudiness overnight along with lighter westerly winds as the surface pressure gradient relaxes.
(Today and tonight) We will see short wave ridging move overhead today as we become sandwiched between two upper level troughs.
Tonight, there will be a dry northwesterly flow aloft ahead of a moderate ridge over the Rocky Mountains. It should be mostly confined to the lower river valley and southern slope (north exposure) again, and moderate drainage flow may keep fog out of much of the urban corridor again as well. The ridge axis should be moving over northeast Colorado by afternoon. High temperatures are forecast in the 30s and 40s across the plains mostly 20s and 30s in the mountains, just a few degrees cooler than normal.
500 mb WPC cluster analysis shows general 500 mb ridging over the northern Plains this weekend as upper low moves out.
Temperatures are displaying local variability from near 40 to the lower 50s. The upper low will continue to remain to our north with impulses moving east over the area. The surface cold front will push further east of the area as high pressure builds further into the area from the northwest. Highs will range from the mid 60s northwest to the low 70s far southeast. A zonal flow aloft will prevail as the forecast area remains within a broad trough with the large upper low over the Southern Great Lakes.
An upper-level low is the foundation for a trough axis that stretches from the midwest region all the way south into the Gulf of Mexico. Nevertheless, the cold front continues the slow, but steady southward march into our region. Somewhat cooler, but noticeably drier air then filters in with a northerly flow.
1147 PM EST Wed Jan 4 2023 Showers will end this evening after the passage of a cold front.
320 AM EST Thu Jan 5 2023 Currently, the Lower Ohio Valley sits on the eastern edge of a large upper trough blanketing much of the central United States. Within this trough, a low pressure system sits on the southwestern side of the Great Lakes region. Later today, as the low pressure system bobbles east over the Great Lakes, pressure gradients tighten over the CWA. Many will see lots of sunshine with a few passing clouds, but temperatures will be cooler than yesterday, only reaching into the mid 40s to low 50s. This afternoon, a weak front, extending south from the low pressure system, will push through the CWA.
Parent upper trough begins sliding east today, moving across the central Great Lakes later this afternoon leading to increasing upper divergence over the course of the day. Thermal troughing will be firmly in place by this point as 850mb temps hold around -7 to -8C supporting sufficient ice nuclei for snow to be the predominant p-type for the bulk of SE MI. Some melting snowflakes mixing in is likely through the daylight hours given surface temps remain above freezing in the mid 30s. Respectable mid-level vorticity core in the base of the trough axis swings across northern IN/OH during the latter half of the evening offering a window of increasing coverage and intensity of snow showers over areas along/south of I-69. Any accumulations are likely limited to late evening/tonight when temperatures fall to near freezing.
320 AM EST Thu Jan 5 2023 High pressure builds from the west over the next few days bringing rain-free and near seasonable weather.
A high pressure ridge will remain overhead through around 12Z, keeping skies mostly clear. However, a disturbance will start to break down the ridge after 12Z, bringing increasingly high- and mid-level cloudiness to the area, along with some mountain showers over Southwest Montana after 18Z and on the remainder of the Continental Divide after 00Z.
1234 AM EST Thu Jan 5 2023 Latest surface analysis shows the occluded low pressure system centered over the Mitten State with the cold front traveling south along I-75 through central KY. Satellite shows mostly clear skies in the wake of the cold front with a few cloud streets of stratocumulus streaming SW-NE. Mostly clear skies with periods of cloud cover will allow for temperatures to drop into the low to mid 30s by tomorrow morning. Model soundings do show enough moisture depth tomorrow late afternoon/evening to allow for possible sprinkles/drizzle as the upper low traverses the OH Valley into the Great Lakes, so have included a slight chance mention of sprinkles to end the short term period.
Arthur Satellite imagery shows mostly clear skies under NW flow aloft as a ridge builds eastward thru the PacNW. This will be followed by a modest increase in gap winds tonight as the aforementioned ridge axis shifts to central MT. w/ poor mixing holding temps back some across lower elevations despite the ridging. Next Pacific trof will introduce a chance of snow showers to our west by late Thursday night.
Showers ahead of a cold front continue to exit east at this hour. Made a quick update to increase PoPs with a line of showers crossing the area ahead of a cold front. Surface analysis shows cold front entering the Middle Ohio Valley early this afternoon. Tonight's temperatures will range from the upper 30s lowlands, into the lower 30s highest elevations.
06Z surface data has the low southeast of KEAU. A weak boundary extended south from the low through Illinois. Dew points were in the 30s near the low and across the Ohio Valley. Upper level disturbances rotating around the low center in Wisconsin will keep light snow and flurries going through mid-morning across the area.
958 PM CST Wed Jan 4 2023 (Issued 958 PM CST Wed Jan 4 2023) Intermittent pockets and bands of very light snow will continue tnt and Thu as the upper low moves across srn WI. A brief period of freezing drizzle will be possible before a transition to snow as surfaces fall below freezing. Additionally with lows below freezing wet untreated surfaces will likely refreeze bringing slick conditions overnight into Thursday morning.
1048 PM CST Wed Jan 4 2023 (This evening through Thursday) A weak cold front this evening will bring in drier air, especially northwest of I-44. Because of that, lows will drop into the mid-20s across much of the area and around freezing in the Red River Valley. Tomorrow will be the last in our string of warmer-than-normal, calm days.
640 AM EST Thu Jan 5 2023 An upper level low will track through the southern portion of the Great Lakes and bring scattered rain and snow showers to the region. M30C 5H temperatures suggest and HRRR suggest convective elements/brief snow bursts associated with transitory bands, though overall impact offset by above freezing surface temperatures.
410 AM MST Thu Jan 5 2023 Upper ridge axis will move across the Rockies and adjacent central High Plains today and tonight. Winds will turn northwest Friday night behind the low, when perhaps a few light wraparound rain/snow showers will develop.
A high pressure ridge will move east across North Central and Southwest Montana today. Otherwise, the shift of the ridge will allow high- and mid-level cloudiness to increase from the west.
That system has a 100-130kt jet at the base of that trough which will move across Arizona later today into Friday.
(Today and tonight) An upper ridge reaches the Texas panhandle late today, and the associated subsidence provides for mostly sunny skies and temperatures a few degrees warmer than yesterday. Tonight, expect increasing mid- and high- level clouds as strong WAA begins from southwest to northeast as the upper ridge axis crosses Oklahoma ahead of an approaching trough.
505 AM CST Thu Jan 5 2023 Today: Stubborn closed low currently situated over eastern IA slowly wobbles eastward today, putting an end to any meaningful snowfall by daybreak.
We could see a few spots in the lower 40s by sunrise. Another pleasant day is expected as high pressure slowly shifts eastward. The increasing moisture will be noticed tonight though as low temperatures east will be nearly 10 degrees warmer than this morning. Onshore flow will keep immediate coastal areas in the lower to mid 70s as water temperatures are around 60.
Dry conditions are expected to prevail with some cloudiness, most of that being provided by an upper level trough passage tonight. Temperatures will reflect continued ridging influences shifting from western contiguous U. Tonight lows will be around freezing.
Fairly quiet today w/ a slight warming trend as a transitory ridge moves from west to east across the CWA. A bit more active late Thursday night through Friday, especially for the mountains as a weak short wave tracks across the central Rockies & into the High Plains.
640 AM EST Thu Jan 5 2023 High pressure builds from the west over the next few days bringing rain-free and near seasonable weather.
556 AM CST Thu Jan 5 2023 (Today through Friday) This AM at the surface, a cold front is present to the SE of AL extending from a low pressure system over NY. High pressure will continue to build over the C U. The ridge center is then expected to shift to over the Deep South as the main low over NY pushes to the EWD into the Atlantic taking the front with it and the SRN edge extending to the base of FL. The sky should remain clear through the short term with W winds 5-10kts today but lighter tomorrow as the ridge center settles in over AL and gradients relax. Cooler readings are expected today as opposed to our transitional day on Wed and still cooler for Friday.
(Today through Friday) A cold front will make its way across the Florida peninsula today, reaching South FL late this evening. Dry, cool air will filter in behind the cold front overnight and Friday as an area of high pressure starts building in from the southeastern US.
Skies will clear from north to south behind the front with noticeably cooler and drier air filtering into the area. SW winds ahead of the approaching cold front will veer to W/NW during the day and into tonight. Cautionary Statements likely to be hoisted again as the cooler north winds will produce more wind chop esp in the Gulf Stream. The low stratus clouds providing MVFR/IFR CIGs may take some time to erode.
The cold front and precipitation band is forecast to enter western Coconino and Yavapai counties in the late afternoon and early evening, then advance to the Flagstaff and Prescott areas by mid/late evening. The highest precipitation and snowfall amounts are expected in northwest Coconino County, with progressively lower amounts toward the east.
Key Points: * Cooler conditions remain across the region today, with warmer temperatures returning Friday.
950 AM EST Thu Jan 5 2023 A cold front will move across the region late today through this evening. High pressure will briefly build in on Friday. A slow-moving low pressure system will pass south of the region over the weekend. Cyclonic flow around low pressure in the upper Midwest region will continue to usher in southwesterly flow into our CWA. As a cold front moves through the area this evening, there will be some light precipitation accompanying it. Any accumulation will be light and limited impact as pavement temperatures will likely remain above freezing. Lows tonight will fall into the lower 30s area wide. Period starts with the potential for light snow accumulations along a band of isentropic lift developing well ahead of low pressure to the southwest.
339 AM CST Thu Jan 5 2023 Troughing will exit the region today and ridging aloft will build in from the west overnight. At the surface, high pressure will likewise shift east and become centered directly over the forecast area into early Friday morning. All of this will result in quiet and cooler conditions across the forecast area through the period.
521 AM MST Thu Jan 5 2023 A ridge of high pressure will be over the region through tonight. The ridge axis will along the CO/UT border at 12z with a moderate northwesterly flow over the forecast area. As the ridge axis shifts eastward today, mid and upper level moisture overrunning the ridge will start spreading across the region. High temperatures will be warmer today, but still cooler than normal for this time of year. For tonight, the ridge axis will shift to the CO/KS border with a southwesterly flow aloft developing over the north central and northeast CO. Weak upper troughing will push across the CWA on Friday.
518 AM CST Thu Jan 5 2023 (Thursday through Friday) The early morning sfc analysis indicates sfc ridging extending from the TX Panhandle SE through N and E TX into Cntrl LA. Looking aloft, the morning water vapor imagery depicts that troughing beneath the closed Midwest upper low is swinging E through AR/LA, with a dry NW flow noted on the IR imagery across the majority of the Srn Plains and Lower MS Valley. Chamber of commerce weather is expected today as abundant sunshine is observed beneath the dry NW flow aloft in wake of the departing trough to the E, with the center of the sfc ridging sliding SE into the region this afternoon.
Scattered snow showers will continue to pinwheel into the region this morning beneath the upper low. There, thermo profiles reveal steep lapse rates, strong upward omega and sufficient moisture through the dendritic growth zone (DGZ) -- all byproducts of the upper low as it pivots across the region this morning. Skies should begin to clear late tonight as large-scale subsidence works in behind the departing upper low.
545 AM CST Thu Jan 5 2023 (Today and tonight) We will see short wave ridging move overhead today as we become sandwiched between two upper level troughs.
906 AM EST Thu Jan 5 2023 Current surface analysis charts show the cold front located over the Nature Coast this morning. Patchy fog is expected to mix up in the next hour or so, while low and mid clouds will continue as the cold front continues to push southward today and eventually dissipates. Overall, the forecast is on track and the front should be out tonight leaving clear skies with cooler/drier airmass for the weekend. The warm, humid southerly flow that has been favorable for sea fog finally backs to the northwest and eventually to the north as a cold front moves through the region today.
Temperatures should start out in the lower to mid 30s in some sheltered valley locations to upper 30 to lower 40s elsewhere. Abundant sunshine should allow temperatures to climb into the lower to mid 50s this afternoon with neutral or weak cold air advection occurring.
The winds should take on a more variable direction as high pressure builds southward across the FA this afternoon. This should help to keep minimums slightly warmer, with values more in the 20s instead of teens. This will all depend on where the warm front makes it to Friday. South of the front, good downsloping will result in the warmer highs.
This ridge moves into the upper Great Lakes 00z Sun. In the extended, the GFS and ECMWF show a 500 mb trough over the upper Great Lakes 12z Sun with a ridge over the Rockies. This ridge moves to the upper Great Lakes 12z Mon and gets flattened out a bit. By 12z Tue, troughing moves back into the upper Great Lakes which then moves into the ern U. More troughing then moves into the central and northern plains 12z Thu.
High temperatures will be in the low to mid 60s across the Big Country to the mid 60s to near 70 across the rest of the area. The gusty winds in combination with steadily increasing surface moisture overnight will result in overnight lows only dropping into the low to mid 40s for most locations.
334 AM CST Thu Jan 5 2023 Key Points: * Cooler conditions remain across the region today, with warmer temperatures returning Friday.
A upper level ridge is currently located over the Desert Southwest and extends up into southwestern Canada early this morning. For Thursday night, a subtle LLJ will develop over the Panhandles which will promote mixing in the low levels. However, when looking at forecast soundings, there is a lot of dry air in the lower levels, so am hesitant to add any mentionable PoPs at this time. Temperatures will also be quite warm as the ridge is overhead and WAA will be the strongest.
30 Previous Discussion: /Through Friday/ Subsidence will be the dominant meteorological process affecting North and Central Texas through Friday, as a large scale upper trough exits to our east and a ridge enters from the west. At the surface, a ridge continues to also build in from the west, which will keep calm to light north winds going overnight. Dry air, clear skies, and light winds will allow temperatures to drop below freezing for areas mainly north and west of the DFW Metroplex by daybreak Thursday. Warm advection and the presence of the mid level ridge will allow Friday temperatures to climb to well above normal, with afternoon highs ranging from the mid 60s to mid 70s.
345 AM MST Thu Jan 5 2023 A ridge of high pressure will be over the region through tonight. The ridge axis will along the CO/UT border at 12z with a moderate northwesterly flow over the forecast area. As the ridge axis shifts eastward today, mid and upper level moisture overrunning the ridge will start spreading across the region. High temperatures will be warmer today, but still cooler than normal for this time of year. For tonight, the ridge axis will shift to the CO/KS border with a southwesterly flow aloft developing over the north central and northeast CO. Weak upper troughing will push across the CWA on Friday.
Still some lingering light snow across the far southeastern CWA early this morning on the backside of the spinning upper low. This looks to likely be the last hurrah as the low is getting far enough away to where dry conditions are now in the forecast by 12Z this morning.
527 AM CST Thu Jan 5 2023 Troughing will exit the region today and ridging aloft will build in from the west overnight. At the surface, high pressure will likewise shift east and become centered directly over the forecast area into early Friday morning. All of this will result in quiet and cooler conditions across the forecast area through the period.
Currently, the Lower Ohio Valley sits on the eastern edge of a large upper trough blanketing much of the central United States. Within this trough, a low pressure system sits on the southwestern side of the Great Lakes region. Later today, as the low pressure system bobbles east over the Great Lakes, pressure gradients tighten over the CWA. Many will see lots of sunshine with a few passing clouds, but temperatures will be cooler than yesterday, only reaching into the mid 40s to low 50s. This afternoon, a weak front, extending south from the low pressure system, will push through the CWA.
Friday night is the transition period when increasing clouds can be expected as the next cold front begins to approach the area.
Areas in between (from TKV/RRL/AUW eastward to OCQ/MNM/Door County) were getting freezing drizzle or drizzle; the result of lingering mid-level dry air, which was limiting ice crystal formation in the saturated layer. Surface wet-bulb temperatures had fallen below freezing over most of the forecast area, result in slippery stretches on untreated roads. Highs today will be in the middle to upper 20s northwest, to the lower to middle 30s southeast. Lows tonight should range from the single digits northwest to the lower to middle 20s east. Highs on Friday will be a bit cooler - in the 20s.
408 AM CST Thu Jan 5 2023 (Issued 358 AM CST Thu Jan 5 2023) Today through Friday: Low pressure will fill in over Wisconsin through this morning leaving an elongated trough extending westward over the region from southern Ontario. This trough will sink south and east over the area into tonight. There may be a short uptick in activity between now and the mid to late morning hours as a vortmax in association with the upper low pivots eastward. After the trough exits this evening, dry conditions will take hold for Friday and high pressure will build in from the northern Plains.
Several additional lines of showers with a few embedded thunderstorms are likely before the upper trough finally swings through later this afternoon or early this evening. The High Wind Warning will be lowered shortly with a wind advisory until early afternoon for the north end of the Sacramento Valley. Short wave ridging builds in tonight into Friday and that will bring a short break from the active weather for most of the region, though renewed warm-advection will continue precipitation chances north of Interstate 80.
An upper level trough continues its journey over the Midwest early this morning. For the northern Gulf coast, zonal flow will largely take hold today as the upper trough traverses the Ohio Valley. By this evening, northwest flow from weak upper ridging will develop over the region as the aforementioned upper trough pivots east over the northeastern US. Much drier and cooler weather than we've seen recently is therefore anticipated over the local area through late week thanks to the above pattern. Temperatures will be near seasonal norms, with highs in the 60s today, lows dipping into the upper 30s to lower 40s tonight, and highs in the lower to mid 60s on Friday. The HIGH RISK of rip currents continues through early this afternoon.
446 AM MST Thu Jan 5 2023 Satellite imagery shows an exapnsive area of high level clouds moving east under the ridge axis (currently oriented over the Great Basin, but slowly sliding eastward this morning). This ridge will continue to nudge eastward over the forecast area by mid-day today. leading to slightly gusty winds mainly over favored ridges. The trough axis will move through the CWA by mid-day on Friday, with snowfall ending by Friday night. Snowfall amounts are on the lower edge of advisory criteria in a couple of the central and northern mountain zones.