Aikyam-Lab/Synoptic-Bench huggingface dataset:
236 AM CST Wed Jan 27 2021 Snow is expected to rapidly increase in coverage early this morning from southwest to northeast as an upper level low pressure system over central KS moves eastward into central and northern MO. As this area of increasing lift spreads into the forecast area where surface temperatures are currently below freezing, we expect a rapid uptick in snowfall coverage over the next 1-3 hours. Lows tonight into Thursday morning will then drop into the upper teens to the lower 20s.
Temperatures today will generally reach the lower to middle 30s. 5" per hour in these areas, which could cause accumulation on the roads even with road temperatures above freezing. Cold, Canadian high pressure builds over the region tonight, and low temperatures will fall into the upper teens to lower 20s. Low temperatures tomorrow night will again be seasonably cold, in the lower to middle 20s.
353 AM EST Wed Jan 27 2021 A large high pressure area will bring a cold north flow accompanied by light lake effect snow inland south of Lake Michigan into Thursday; otherwise, partly to mostly cloudy skies are expected.
High pressure will build southward from Canada during the mid-week. Surface occluded front pushing east across south-central PA attm, trailed closely by a cold front slicing across the NW mtns and Laurel Highlands. Some flurries will fly overnight across the Central Mtns, while the low clouds and stable airmass within the region of cold air damming will transition twd improving conditions late as a light, drying WNW breeze develops overnight. Gradient will be tight enough thru the night and Wed to keep 10-20mph with gusts into the m-u 20s in the higher elevs and 8-15mph elsewhere as we veer to the NNW. Expect morning mins in the lower teens N and 15-22F elsewhere on Thurs and maxes won't be much higher than that - only getting into the upper teens N and l30s far S.
Developing warm front noted from central MT into eastern WY. Water vapour had upper low over central KS, heading east as upper ridge amplifies over the Rockies.
Temps in clear area tonight looking fine with -15 to -25F and in cloud area warmer -3 to -10F. Arctic high pressure is currently centered over east- central Saskatchewan into Manitoba, where temperatures this morning were as low as 40 below zero. Cloud cover will continue to impact the temperature forecast, however, with a gradient of warmer temperatures in the western portion of the CWA.
Yesterday's system is currently spreading snow and ice across the Northeast CONUS, while the main longwave trough is moving eastward across the Four Corners region. This trough will approach the forecast area tonight. The antecedent air mass ahead of this system is quite cold, with CAA and widespread clouds keeping afternoon temperatures in the low to mid 20s today. As the longwave trough moves out onto the Plains this evening, a laterally translating band of snow will develop across Kansas. With shallow moisture remaining at the surface from the recent snow, areas of freezing fog will likely develop, either after clouds clear or through low stratus building down to the surface. An upper ridge will build over the region while the next trough digs into the southern California and Arizona.
Meanwhile, surface ridging will continue to build across the area through tonight. The ridge axis will be positioned across the Upper MS Valley by early Thursday. Did continue to trend overnight lows cooler, with light winds and relatively fresh snow for much of the area.
/issued 520 PM CST Tue Jan 26 2021/ Another pleasant day is on tap for the Mid-South this afternoon, with current temperatures in the lower 60s to our south and lower 50s to our north. Expect cooler and below normal Wednesday, with highs generally in the 40s and lows in the upper 20s. High pressure will settle across the region by Thursday with yet again, cooler temperatures.
East of the Cascades, the high terrain will begin to observe the heaviest snowfall so far accumulating an additional 1"-2", if it is not being observed already. Freezing levels are around 3500 ft, but snow is making down to around 1500 ft this afternoon. Freezing levels will lower to around 1000 ft overnight, however, precipitation will become showery so snow showers will be hit or miss and snow accumulations in the valleys will be minimal, if any.
A cold front is currently moving through the Hill Country and Rio Grande plains this evening. A cold front will move through South Central Texas tonight from the northwest to the southeast. While these winds will bring cooler air, they will keep the boundary layer well mixed.
(Today and tonight) Mid-upper trough is crossing the area this morning, and height rises will quickly commence today as mean ridging builds which will be the start of a warming trend the rest of the week. Nighttime microphysics RGB shows low stratus extending back into the High Plains of eastern Colorado.
348 AM EST Wed Jan 27 2021 Weak low pressure will exit across southern New England today.
While some of the high resolution CAM guidance shows the rain will wind up south of our CWA, the forecast looks to be well in line with most guidance so felt no adjustments were warranted there. VFR conditions are forecast at all sites to begin the period with conditions deteriorating to MVFR at all sites on Wednesday afternoon as precipitation arrives ahead of the next low pressure system. Winds will become gusty from the NW behind the cold front on Wednesday evening. JB Chattanooga Airport, TN 58 30 45 26 51 / 60 40 0 0 0 Knoxville McGhee Tyson Airport, TN 54 29 39 23 46 / 80 80 0 0 0 Oak Ridge, TN 55 28 39 22 46 / 80 60 0 0 0 Tri Cities Airport, TN 53 26 35 18 42 / 80 80 10 0 0 TN.
Starting Wednesday night, increased cloud cover will lead to warmer (5-10 degrees) than normal lows.
112 AM EST Wed Jan 27 2021 A weak area of low pressure will move across New York state overnight and then exit into southern New England on Wednesday. As a result, precipitation is mainly snow, although there have been pockets of freezing drizzle.
High pressure will settle across eastern Utah and western Colorado this morning, resulting in an overall quiet weather day compared to what's been experienced lately. 700mb temperatures will rebound by a degree or two in the wake of yesterday's system which will translate to slightly warmer highs across the majority of the region. The weak transitory ridge will slide east of the Divide this evening with upper level winds turning to the southwest. Guidance seems a bit too bullish with warming the southern valleys with the NAM warming Durango back into the low 50s Thursday afternoon.
At 500 mb, a closed low was back over eastern CO as of 00Z and there were 50 meter height falls over the TX panhandle. Water vapor satellite imagery early this morning showed the weak closed low over KS. High pressure at the surface extends from the eastern Dakotas and western MN down into KS and MO as of 3 am today. But the low levels of the atmosphere (aloft) will be trying to warm.
The weather has been pretty stagnant the past few days, caused by the same arctic high pressure that is still centered over Manitoba, leading to bitterly cold temperatures in much of the northwest and north central parts of the state where skies are clear.
956 AM EST Wed Jan 27 2021 Weak low pressure will exit across southern New England today.
A pretty quiet short term, with low clouds and patchy freezing fog around the Panhandles this morning. Low pressure system that brought yesterdays light snow continues to spin cooler air in behind as it moves to the east. Sky conditions will gradually improve through the day, but the cooler air in place will only have highs in the mid 30s to mid 40s. High pressure will gradually amplify over the central CONUS through the week and as a result warmer and dry conditions are expected.
Latest sfc obs indicate dense fog continuing at the Acadiana terminals - however this is expected to be short-lived at this point as brisk nwrly flow associated with the passing cold front should dissipate the fog upon its arrival next hour or so. High pressure will build into the area this morning with skies beginning to clear from west to east this morning into the afternoon.
525 AM CST Wed Jan 27 2021 (Today and tonight) Mid-upper trough is crossing the area this morning, and height rises will quickly commence today as mean ridging builds which will be the start of a warming trend the rest of the week. Nighttime microphysics RGB shows low stratus extending back into the High Plains of eastern Colorado.
Deformation zone was producing light snow across north central Kansas while differential vorticity advection ahead of the low along with 700-500mb layer frontogenetical forcing negative omega within a saturated dendritic growth zone over east central and northeast Kansas. This zone of lift will shift to the east early this morning as the upper low moves into eastern Kansas. The mid level trough will move east into Missouri this morning ending precipitation across eastern Kansas by 15Z or so.
Temps rise to near-record values this afternoon, reaching the low 80s north and mid 80s across the south. A cold front will cross central Florida this evening into the overnight, bringing a chance of showers to areas along and north of I-4. Conditions VFR through for the rest of this afternoon, then a cold front will push into the area this evening bringing a chance of showers from KISM-KTIX northward. Favorable boating conditions are expected today as southwest winds become west at 10-15 knots this afternoon ahead of an approaching cold front.
Cloud cover remains the dominant feature across the area through the day, becoming less prominent tonight as the Arctic high pressure moves east of our area. Lows tonight remain cold as well with the influence of high pressure dropping temperatures in the single digits either side of zero for southwestern MN and northwestern IA.
234 AM MST Wed Jan 27 2021 09z surface analysis shows weak lee side trof forming in central MT, but main area of pressure falls is to our west, and as a result Livingston has not seen gusty SW winds yet (though they have developed at Nye where gusts are exceeding 30 mph). Thursday will be dry as well, and a bit warmer with mid 30s to mid 40s for highs. As the upper ridge axis shifts east, developing southwest flow aloft will bring some orographic light snow to the Beartooth Absarokas today and tomorrow.
Forcing for ascent ahead of the trough has allowed light snow to develop over eastern Kansas and western Missouri this morning. this trough will continue to quickly move east with snow overspreading the entire area this morning. However, with temperatures hovering in the low to mid 20s that will yield snow ratios of 14:1-16:1 allowing snow to quickly accumulate. A warming trend is expected to end the work week as upper level ridging will build over much of the central CONUS.
/issued 423 AM CST Wed Jan 27 2021/ Colder air continues to filter into the Mid-South this morning behind a cold front that is located across Central Mississippi into Central Alabama at this time. Meanwhile, an upper level trof is digging into Southwest Missouri and Northwest Arkansas at this time. The trough will move through the Mid-South today. Precipitation associated with the upper trough will begin to move into Northeast Arkansas shortly after sunrise. Accumulations will mainly occur on grassy and elevated surfaces, but can't rule out some travel problems as bridges and overpasses may become slick. High pressure will build into the region on Thursday.
High pressure will build into the area this morning with skies beginning to clear from west to east this morning into the afternoon.
851 AM CST Wed Jan 27 2021 Mixture of sun and clouds this morning will give way to mostly cloudy/overcast conditions this afternoon as a cold front sweeps into the region from the NW late in the day into the evening. The clouds should decrease during Thursday morning as modified Canadian high pressure builds towards the region. Even with more sun in the afternoon, high temperatures will only rise into the lower 40s. Even colder Thu night with lows falling into the low/mid 20s.
With upper ridging building in to the west, waa will set up. The ridge continues to build over the Plains on Thursday with H85 temps finally climbing into positive territory again.
555 AM EST Wed Jan 27 2021 Intensifying low pressure system will move along a stalled front across the area today and tonight, providing a quick shot of soaking rainfall. Cold and dry Canadian high pressure will follow and Thursday and extend into the upcoming weekend.
423 AM CST Wed Jan 27 2021 Colder air continues to filter into the Mid-South this morning behind a cold front that is located across Central Mississippi into Central Alabama at this time. Meanwhile, an upper level trof is digging into Southwest Missouri and Northwest Arkansas at this time. The trough will move through the Mid-South today. Precipitation associated with the upper trough will begin to move into Northeast Arkansas shortly after sunrise. Accumulations will mainly occur on grassy and elevated surfaces, but can't rule out some travel problems as bridges and overpasses may become slick. High pressure will build into the region on Thursday.
High pressure will build southward across Manitoba and Ontario through late week, leading to mainly dry and cold conditions. Cold front has made it through central PA this morning. The pressure gradient will be tight enough through much of the day to keep northwest winds near 10-20 mph with gusts into the mid-upper 20s in the higher elevations and 8-15 mph elsewhere. Just a few flurries are expected in the higher elevations of the Alleghenies and Laurel Highlands, mainly early in the day.
Accumulating snow of generally less than an inch is expected for far northeast Oklahoma and far northwest Arkansas, with locally one to two inches possible, especially across the higher elevations of Arkansas. After a chilly start Thursday, a warming trend will get underway as we head into the weekend as upper ridging builds into the region.
While an upper ridge moves into eastern Montana today with warmer air aloft, low level Arctic air will be slow to exit with east to SE winds helping to keep the low level cold air in place.
The cold front has reached the coast this morning and will continue to push offshore today and any shower activity associated with it is dying down although some light showers are still possible this morning. Breezy conditions will accompany drier conditions and are expected throughout the day today under partly cloudy skies and afternoon highs in the low 70s. Tomorrow will be even cooler with highs in the 60s as CAA and sufficient cloud cover keep work to keep temps down.
With a low pressure system traversing across the southwestern United States and a ridge locked over the Northern Rockies, this kind of flow pattern isn't the greatest for delivering concentrated periods of precipitation to our region.
342 AM CST Wed Jan 27 2021 Today and Tonight: Early morning water vapor imagery/RAP analysis showed the circulation around a closed low over the Central Plains. About the time light showers begin ending in our southeast later this morning, light rain will start in our northwest associated with the closed low. The closed low will support a cold front that will through our CWA today as well. This cold front will be a clearing front ushering in colder and drier air on a gusty northwest wind that will last into early evening. Temperatures will only top out in the 50s in the north and in the upper 60s south before the cold front moves through. This will result in much colder morning lows then we have seen recently with lows back below freezing in the north and in the 30s elsewhere.
Thursday highs moderate as the central CONUS ridge expands farther east.
After the upper level trough passes through this evening we'll see increasing heights as a ridge moves overhead that will allow high pressure to build over the area.
/28/ Today and Tonight: Early morning water vapor imagery/RAP analysis showed the circulation around a closed low over the Central Plains. About the time light showers begin ending in our southeast later this morning, light rain will start in our northwest associated with the closed low. The closed low will support a cold front that will through our CWA today as well. This cold front will be a clearing front ushering in colder and drier air on a gusty northwest wind that will last into early evening. Temperatures will only top out in the 50s in the north and in the upper 60s south before the cold front moves through. This will result in much colder morning lows then we have seen recently with lows back below freezing in the north and in the 30s elsewhere.
This system will continue to pull away from the region, allowing upper ridging to build in from the west later today into tonight. However, light and relatively moist easterly winds across the southeast Texas Panhandle have supported the development of patchy freezing fog. These pockets of freezing fog could linger across our northeastern zones through around daybreak. A weak cold front will follow, swinging winds around to the north, and keeping the cool air in place. Upper level ridge axis will be located over the forecast area on Thursday. However, a weak disturbance will move through the ridge spreading mid-level clouds over the region.
647 AM EST Wed Jan 27 2021 Weak low pressure will exit across southern New England today.
High pressure and drier air build into the area this afternoon and tonight to decrease clouds.
542 AM CST Wed Jan 27 2021 A cold front is dropping southward through the southern Texas Panhandle early this morning. This system will continue to pull away from the region, allowing upper ridging to build in from the west later today into tonight. However, light and relatively moist easterly winds across the southeast Texas Panhandle have supported the development of patchy freezing fog. These pockets of freezing fog could linger across our northeastern zones through around daybreak. A weak cold front will follow, swinging winds around to the north, and keeping the cool air in place. Upper level ridge axis will be located over the forecast area on Thursday. However, a weak disturbance will move through the ridge spreading mid-level clouds over the region.
426 AM MST Wed Jan 27 2021 Main Forecast Concerns/Challenges: 1) Patchy dense freezing fog this morning across southern El Paso and northern Pueblo counties, and across the far eastern plains. With the cold temps in place, freezing fog with slick conditions has been a concern. Additionally, slick or icy conditions could also be observed, especially on bridges or elevated surfaces. In this location, patchy dense fog/freezing fog will also be possible.
409 AM MST Wed Jan 27 2021 An upper level ridge will build over the area today and tonight with the flow aloft gradually becoming more southwesterly. For now will keep readings in the 35 to 40 degree range but areas with no snow cover could reach the lower to mid 40s. Closer to the front range HRRR has a Denver Cyclone this aftn with readings staying in the upper 20s on the back side of the cyclone over the nwrn suburbs into swrn Weld county. For tonight, winds will increase over the higher terrain as the flow aloft strengthens. On Thursday, the high pressure ridge aloft will shift eastward across the central plains resulting in an increasing southwest flow aloft over Colorado. With this flow, thermal ridge builds into Colorado as 700mb temperatures climb to around +2c on the plains.
607 AM EST Wed Jan 27 2021 A large high pressure area will bring a cold north flow accompanied by light lake effect snow inland south of Lake Michigan into Thursday; otherwise, partly to mostly cloudy skies are expected.
Today will start off quite cold with pockets of freezing temperatures across the lower deserts. Strong radiation cooling through the rest of the morning is expected to result in very cold lows, and for some the coldest so far this winter, with temperatures falling into the 30s across the lower deserts and 20s east of Phoenix. A very strong upper low is impacting the west coast this morning with prolific precipitation occurring in California at the spout of a long-fetched moderate to strong IVT plume. Ensemble trends all but agree that the low will evolve into a progressive open wave once pushing inland and be a warmer system than our last. As a progressive/fast-moving and warmer system, not expecting the degree of impacts seen with the previous system.
Cloud cover continues to be a challenge, and where it remains temperatures are much warmer. Thursday should be a tad warmer, but there will also be steadier southeast winds.
517 AM CST Wed Jan 27 2021 Snow is expected to rapidly increase in coverage early this morning from southwest to northeast as an upper level low pressure system over central KS moves eastward into central and northern MO. As this area of increasing lift spreads into the forecast area where surface temperatures are currently below freezing, we expect a rapid uptick in snowfall coverage over the next 1-3 hours. Lows tonight into Thursday morning will then drop into the upper teens to the lower 20s.
244 PM CST Wed Jan 27 2021 High pressure will build in and bring a couple of cool and rather dry days.
All guidance continues to erode the low clouds and moisture this afternoon and evening, with increasing mid to high level clouds this evening and overnight. Southwest flow aloft will increase Thursday as a deep, splitting trough moves deeper into the western United States. Thursday should be warmer with increasing mid level downslope flow.
This should help support the development of areas of freezing fog and low stratus by late evening.
229 PM EST Wed Jan 27 2021 High pressure ridges over Florida for the first half of the day before a weak cold front moves through later this evening. The highest chances of rainfall will be over the Nature Coast with 40- 60 percent POPs and 20-40 percent POPs from Tampa Bay southward. Most of the fog that was being reported this morning has since burned off, except over the cooler gulf waters where some fog will linger through the evening hours.
The highest accumulations have been along and northwest of a line from Dexter Missouri to Carbondale Illinois, where 2 to 3 inches have fallen. Lows are forecast to range from the upper teens around kmvn to the lower 20s in most other areas. Lows Thursday night are forecast in the low to mid 20s, however much will depend on whether winds become calm where the ground is snow-covered.
1042 AM MST Wed Jan 27 2021 An approaching trough will bring two issues concerning the short term forecast. While only 1 to 3 inches of snow fell recently across that area, it should be primed to blow as temperatures have stayed well below freezing, keeping it from glazing over. Elsewhere, locations will mainly remain dry, with warmer highs on Thursday as warmer air advects into the area. The gusty southwest wind will remain across the Wind Corridor through the period, but expect the highest winds today.
The low clouds are thinning off and shouldn't return. A pretty quiet short term, with low clouds and patchy freezing fog around the Panhandles this morning. Low pressure system that brought yesterdays light snow continues to spin cooler air in behind as it moves to the east. Sky conditions will gradually improve through the day, but the cooler air in place will only have highs in the mid 30s to mid 40s. High pressure will gradually amplify over the central CONUS through the week and as a result warmer and dry conditions are expected.
1011 AM EST Wed Jan 27 2021 Intensifying low pressure system will move along a stalled front across the area today and tonight, providing a quick shot of soaking rainfall. Cold and dry Canadian high pressure will follow and Thursday and extend into the upcoming weekend.
1244 PM EST Wed Jan 27 2021 A large high pressure area will bring a cold north flow accompanied by light lake effect snow inland south of Lake Michigan into Thursday; otherwise, partly to mostly cloudy skies are expected.