Aikyam-Lab/Synoptic-Bench huggingface dataset:
A few snow showers are possible early on Saturday before high pressure builds across the region. Locations across NW PA have already fallen below freezing with Pittsburgh and areas south and west soon to follow. Lake-enhanced clouds and a few snow showers will advance across the northern portions of the forecast area before dawn and continue through the first half of Saturday until flow begins to back as ridging builds in. Light accumulation snow may be possible across the Allegheny National Forest southward through the Laurel highlands where the temperature will remain cooler and where upslope component should enhance showers. With low-level wind turning more westerly and the passage of the 850mb thermal trough, shower activity will taper off during the late afternoon and evening. The sky will clear overnight with high pressure passing to our south.
West of Plateau, freezing temps still a good possibility for any low or outlying areas.
/issued 251 PM CDT Fri May 8 2020/ (Tonight and Tomorrow) Main story today has been the strong northerly winds in the wake of last night's cold front. With winds diminishing overnight and high pressure skirting off to the east expect lows in the 40s for most of the area.
The gusty north wind in the wake of the cold front moving through the se has become lighter and will continue to subside this evening. Gusty winds are moving into the ArkLaMiss Delta region, presently behind a cold front and should spread over the rest of the area this evening.
530 PM MDT Fri May 8 2020 Water vapor show persistent ridge along the west cost with continued northwest flow through the northern plains. Low center is noted over southwest ID with a strong upper low over ALTA/SASK. For tonight, upper low over southwest ID will weaken and phase with upper low diving southeast into the northern plains. Strong cold front will bring a band of precip through the area later tonight (primarily after 06z) through Saturday morning, with precip diminishing in the afternoon.
Thinking areas of frost could develop as temperatures fall into the mid 30s, but southwest winds increasing will likely keep temperatures slightly warmer in Lyon County due to the downslope effect from the Buffalo Ridge. A cool start to the weekend with breezy north winds and afternoon temperatures in the lower 50s despite mostly sunny skies. At the surface, clouds will be on the increase as WAA begins to surge northward into the region, bringing slightly warmer conditions west of I-29.
With that, the High Wind Watch area has been converted to a Wind Advisory. Water vapor show persistent ridge along the west cost with continued northwest flow through the northern plains. Low center is noted over southwest ID with a strong upper low over ALTA/SASK. For tonight, upper low over southwest ID will weaken and phase with upper low diving southeast into the northern plains. Strong cold front will bring a band of precip through the area later tonight (primarily after 06z) through Saturday morning, with precip diminishing in the afternoon.
The current forecast still appears to be in good shape with light rain tapering off across much of the region behind the cold front.
Dry conditions will continue overnight as the ridge remains over the area.
Later tonight, the trough will move southeastward across eastern Colorado and winds along the northern Front Range will change to northerly. There will be a slight chance of isolated showers and storms over the higher terrain with some modest CAPE and decent lapse rates during the late afternoon.
High pressure over the area will keep weather dry and warm through the weekend. Low pressure begins to advance towards the area on Sun bringing in moisture and cloud cover.
1035 PM EDT Fri May 8 2020 A cold front will push east across the region this evening and overnight. Chilly high pressure will follow the front over the weekend. A cold upper low remains over southern Quebec and continues to drift east. Meanwhile, as of late evening, one widespread area of rain is primarily along the I-95 corridor, while a second line of light to moderate showers have developed along a cold front that will pass through the region overnight.
Slightly warmer Saturday afternoon as southwest low level flow develops with temperatures in the low 60s.
348 AM CDT Sat May 9 2020 The H5 upper low, that is forecast to bring showers and snow to the region, continues moving southeastward out of southern Saskatchewan into north-central North Dakota. Wet bulb temps are running a bit warmer than the previous guidance with lower 30s generally indicated in model soundings. As of the current guidance, the higher risk areas remain consistent with the previous forecast, and are expected to impact areas around the Devils Lake Basin. There is a transition from north-northwest flow to more of a quasi- zonal pattern as large scale troughing in the eastern US breaks down and slides eastward.
Otherwise, an increase in thicknesses today will lead to a warmer day closer to seasonal averages.
shape with light rain tapering off across much of the region behind the cold front. JB Chattanooga Airport, TN 62 39 71 45 65 / 0 0 10 10 0 Knoxville McGhee Tyson Airport, TN 58 36 68 42 63 / 0 0 10 10 10 Oak Ridge, TN 60 36 68 42 63 / 0 0 10 10 10 Tri Cities Airport, TN 54 30 65 39 57 / 0 0 10 20 10 NC.
/issued 243 PM CDT Fri May 8 2020/ Cold front that blasted through the forecast area early this morning has pushed well south and east of the region. Jordan Winds will return to the south Sunday in response to a surface lee trough. This will also allow highs to be a few degrees warmer than Saturday and help bring moisture back into the region.
/DL/ The cold front has pushed south of the CWA and the rain has ended. Cooler and drier air will continue filtering into the CWA resulting in cooler than normal temperatures in the 40s by morning. Surface analysis had the cold front moving through Hattiesburg at 730pm and local radars showed the light rain dissipating across our southeast most zones. The cold front will continue shifting southeast and much cooler and drier air will move into our CWA. Gusty winds are moving into the ArkLaMiss Delta region, presently behind a cold front and should spread over the rest of the area this evening. An amplified pattern will exist over the CONUS through the early week period with a steep upper ridge in place over the Rockies and upper troughing in place over Appalachia.
1259 AM CDT Sat May 9 2020 For the 06Z TAFs, a cold front is forecast to move across the TAF sites this afternoon with north winds behind this boundary. The cold front that brought the strong winds and cooler temps today has almost cleared the state of Texas at this point. As the high continues moving southeast across KS and into southern Missouri/northern AR over night, winds will ease and begin turning southerly. However, another cold front comes knocking on the door as a low crosses the central Plains.
Southerly winds will commence today ahead of next northwest flow trough and associated cold front but temperatures will only be slightly warmer than yesterday at most locations. As the trough passes over the central plains late today, the cold front will enter northern Oklahoma by midnight, with a reinforcing shot of cooler and drier air.
Much of the area will have some frost by daybreak, and there will be pockets of freezing temperatures, at least briefly. Still, it will be around 15 degrees cooler than normal today with highs from the upper 50s to lower 60s. For tonight, cool and dry high pressure will be over the area. Sunday will bring a nice quick warmup as southwest winds kick in ahead of a dry cold front.
236 AM EDT Sat May 9 2020 A cold front will move off the NC coast early this morning. Unseasonably chilly, Canadian high pressure will follow and build across the middle Atlantic today and tonight. The high will drift offshore and yield moderating southerly flow on Sunday, ahead of a moisture-starved cold front that will cross the region Sunday night. A cold upper low remains over southern Quebec and continues to drift east. Meanwhile, as of late evening, one widespread area of rain is primarily along the I-95 corridor, while a second line of light to moderate showers have developed along a cold front that will pass through the region overnight.
/Today through Sunday/ Upper-level ridge to maintain northwest flow aloft through the short term period resulting in mostly clear skies areawide. Highs on Sunday forecast to climb into the low to mid 70s.
In the wake of the front that passed through the area yesterday, look for temperatures to run 7-10 degrees cooler than seasonable norms today and tonight. Scattered showers and iso tstms near/off the coast (and lingering cloudiness inland) are associated with a combination of a coastal trof and an eastward moving upper level disturbance across the mid/lower Tx coast.
/issued 1001 PM CDT Fri May 8 2020/ Latest surface analysis places a 1001mb low pressure off the coast of New Jersey, with a 1024mb Canadian High over eastern Nebraska. Temperatures are unseasonably cool tonight, with readings in the low to mid 50s across much of the Mid-South. With high pressure in control sunshine is expected Saturday, albeit cold.
At the surface, an area of low pressure will track from SE PA to the S.
Unseasonably cold high pressure centered over southern MO will slide east-southeast today through tonight, keeping the area dry and cool. Frost is still a concern this morning due light winds, clear skies and temperatures around freezing or lower. The freeze warning will expire at 8 am as temperatures should be above freezing by then across the entire area.
Thinking areas of frost could develop as temperatures fall into the mid 30s, but southwest winds increasing will likely keep temperatures slightly warmer in Lyon County due to the downslope effect from the Buffalo Ridge. A cool start to the weekend with breezy north winds and afternoon temperatures in the lower 50s despite mostly sunny skies. At the surface, clouds will be on the increase as WAA begins to surge northward into the region, bringing slightly warmer conditions west of I-29. Best snow chances will be over higher elevations, such as the Buffalo Ridge area.
Look for high clouds to begin spreading into central WI late this afternoon as low pressure approaches from the Northern Plains. A compact low pressure system will come barreling through MN and WI tonight and Sunday.
Am expecting little if any snow accumulation at lower elevations, but the lowering of the snow level will indicate the potential for snow accumulation on the mountain passes.
A mostly sunny sky will allow temperatures to warm into the lower and middle 70s across most of the region.
Still, we will see temperatures mid 20s do significant damage to any tender vegetation such as fruit blossoms tonight as sub- freezing temperatures, and some wind, persist for up to 10 hours.
1001 PM CDT Fri May 8 2020 Latest surface analysis places a 1001mb low pressure off the coast of New Jersey, with a 1024mb Canadian High over eastern Nebraska. Temperatures are unseasonably cool tonight, with readings in the low to mid 50s across much of the Mid-South. With high pressure in control sunshine is expected Saturday, albeit cold.
A cold front will move into the northeast Gulf and stall through today. Expect lows to fall into the low 50s across SE AL and SW GA, and from the mid 50s to low 60s further south and east into FL and the southeast Big Bend.
Daily Record Low Maximum Temperatures Date Chattanooga Knoxville Tri-Cities Oak Ridge 05-09 57(1923) 55(1906) 53(1992) 58(1958) With surface ridging centered across the area tonight and a mostly clear sky, expect efficient radiational cooling and calm winds. Locations across the central and southern valley will be on the edge of frost temperatures, but based on the conditions and anomalous nature of the airmass, believe at least sheltered valleys across the lower elevations will see some areas of frost tonight through Sunday morning. Daily Record Low Minimum Temperatures Date Chattanooga Knoxville Tri-Cities Oak Ridge 05-09 35(1960) 36(1947) 30(1947) 36(1984) 05-10 38(1966) 37(1906) 32(1966) 35(1980) JB.
Northerly flow has helped to reinforce this cold, dry air mass with 0830z temperatures in the low to mid 40s across the area. Expect a clear and very cool day, as highs struggle to make it above the lower 60s -- around 15 degrees below normal for this date. The center of the ridge will settle directly over North Alabama tonight, resulting in a clear and calm night. Another sunny day is expected for Sunday (Mother's Day), and with the high shifting to the east of the region -- winds will veer to a southerly direction. As a result, temperatures will run 8-10 degrees warmer as we climb back into the lower 70s by the afternoon.
Continued cool conditions tonight, with low temperatures forecast in the low 50s across the northeast to low 60s near the Rio Grande.
1150 PM CDT Fri May 8 2020 For tonight, a compact upper trough in northwest flow will drop into the Northern Plains and push a cold front through northeast Wyoming and western South Dakota by late tonight. On Saturday, rain shower chances increase as the upper trough and cold front sweep across western Nebraska. The highest POPs will be late morning until late afternoon along and ahead of the 700mb trough axis, and mainly east of HWY 83. Highs near to slightly cooler than previous forecast. At this time, portions of southwest Nebraska are forecast to fall the low 30s, while the remainder of the area should remain mostly clear and see freezing temperatures in the upper 20s to near 30. On Sunday, another cold front will move into western Nebraska.
West of Plateau, freezing temps still a good possibility for any low or outlying areas. Northerly winds of 5-10 kts through this TAF cycle with VFR skies as high pressure takes over the region.
Other than that, another quiet day expected across the area with temps again climbing into the low 60s across the area. The remainder of Mother's Day will be dry and quiet with temps again hovering in the low 60s area wide.
High pressure building into the region will bring warming temperatures through the weekend. Cooler weather is expected midweek with a chance of showers. As the high pressure builds in over Wyoming later tonight the east to west surface pressure gradient is expected to increase some along the Wasatch Front such that gusts up to 30 mph are possible at the mouths of the favorable canyons in Davis and Weber County and 20-25 mph in Salt Lake County.
The overall upper lvl flow pattern is not expected to chg much thru the weekend, with a persistent upr rdg along the West Coast, and trofing in the East.
A few snow showers are possible early on Saturday before high pressure builds across the region. Temperatures continue to descend as most area observations now show the temperature is below freezing area-wide and below 30 for most locations. Scattered snow/rain showers will continue through the first half of Saturday until flow begins to back further as ridging builds in. Light accumulation snow may be possible across the Allegheny National Forest southward through the Laurel highlands where the temperature will remain cooler and where upslope component should enhance showers.
Temperatures will continue to cool into the lower to middle 30s for this morning for lows. Temperatures will warm into the lower to middle 60s this afternoon. The upper level disturbance Saturday night will bring another shot of cooler air into the region. Highs on Sunday will warm into the upper 50s to the lower 60s.
At the surface, an area of low pressure will track from Long Island to Cape Cod overnight.
302 AM CDT Sat May 9 2020 A strong cold front is advancing rapidly south through the nrn High plains this morning and should sweep into nrn Nebraska after sunrise. A reinforcing cold front will drop into nrn Nebraska Sunday and swrn Nebraska will remain in a bank of frontogenetically forced mid level cloudiness.
330 AM CDT Sat May 9 2020 An area of low pressure and upper level trough will progress southeast across the region today. The associated cold front will slide across the CWA mainly this morning, bringing showers, and perhaps a few thunderstorms to eastern SD and western MN. Strong northwesterly winds will move in behind the cold front with gusts of 45 to 50 mph possible along and west of the Missouri River. With temperatures falling into the mid 30 by late this evening, light snow will be possible, mainly over the higher terrain areas of the Prairie Coteau.
Today Through Sunday Night Quiet conditions are ongoing across the CWA early this Sat morning as high pressure moves into the state. with a brief period of weak SRLY SFC flow expected before another cold front moves into the state on Sun.
407 AM EDT Sat May 9 2020 A weak cold front is currently pushing through the panhandle of Florida with only a light shower or two associate with it. This cold front will push today with only an isolated shower or two possible along the Nature Coast. After that models are in pretty good agreement that a low pressure will form on the tail end of the front in the Gulf of Mexico. This low will push through south Florida on Sunday. After Sunday high pressure will push what remains of the front just south of the Keys and we will enjoy quiet and sunny weather to start our next work week.
/issued 245 PM CDT Fri May 8 2020/ What had been a promising start to warmer weather was interrupted yet again this morning as a strong cold front invaded West Texas and Southeast New Mexico. A weak upper ridge will begin building over the west coast the next few days, leaving West Texas and SE NM under NW flow aloft. A storm system approaching the upper west coast will begin pushing the ridge into the Interior, w/temps attempting to rebound over the weekend. Sunday, models bring a short wave thru the ridge, and there looks to be enough moisture return by that time for isolated to scattered convection, mainly over the higher terrain.
518 AM MDT Sat May 9 2020 Current surface map places low across central North Dakota with cold front dropping through northwest South Dakota-northeast Wyoming. Narrow band of showers associated with cold front across northwest South Dakota into northern Wyoming/southern Montana. Compact upper low located over northwest North Dakota will track into northeast South Dakota early this afternoon.
Our recent cold frontal passage means it will be a fairly cool day today with highs mainly in the lower- to-mid 50s. Temperatures Sunday will be similar with the influence of cyclonic flow aloft, but chances for precipitation should be on the lower side.
The low center will track south of the Northland but an area of 850-700 mb frontogenesis will pivot across our southern zones starting as early as 14Z near Walker and Pine River. Precipitation will taper off from west to east tonight as the low departs. Weak high pressure will spread into the Northland on Sunday.
446 AM CDT Sat May 9 2020 Our biggest concern will center around the sub-freezing temperatures expected tonight. Initially we will see southerly winds this morning that will turn more southwesterly/westerly by early afternoon ahead of a strong cold front. These southwesterly downslope winds will push temperatures up into the lower 60s despite widespread cloud cover. Temperatures will begin to fall off quickly this evening behind the cold front and it will feel downright cold with breezy northwesterly winds that could be gusting over 20 mph.
Wind then become ENE overnight as post- frontal high pressure to the north builds eastward.
315 AM MDT Sat May 9 2020 Current surface map places low across central North Dakota with cold front dropping through northwest South Dakota-northeast Wyoming. Narrow band of showers associated with cold front across northwest South Dakota into northern Wyoming/southern Montana. Compact upper low located over northwest North Dakota will track into northeast South Dakota early this afternoon.
A dry cold front will move across the region late Sunday keeping temperatures well below normal.
An area of low pressure and upper level trough will progress southeast across the region today. The associated cold front will slide across the CWA mainly this morning, bringing showers, and perhaps a few thunderstorms to eastern SD and western MN. Strong northwesterly winds will move in behind the cold front with gusts of 45 to 50 mph possible along and west of the Missouri River. With temperatures falling into the mid 30 by late this evening, light snow will be possible, mainly over the higher terrain areas of the Prairie Coteau.
Widespread frost and freezing temperatures affected Middle Tennessee this morning with record lows set at both Nashville and Crossville. Northerly winds of 5-10 kts through this TAF cycle with VFR skies as high pressure takes over the region.
A ridge of high pressure will be allowing for the majority of the Northern Rockies to experience a fairly nice weekend. These winds could create a some choppy conditions on area lakes, and make conditions feel a bit cooler than places further to the west, such as north central Idaho.
Northeast winds are also increasing above forecast levels as a modest pressure gradient remains in place with high pressure still centered over the central Ozark Plateau. The center of the ridge will settle directly over North Alabama tonight, resulting in a clear and calm night. Another sunny day is expected for Sunday (Mother's Day), and with the high shifting to the east of the region -- winds will veer to a southerly direction. As a result, temperatures will run 8-10 degrees warmer as we climb back into the lower 70s by the afternoon.
525 AM CDT Sat May 9 2020 A strong cold front is advancing rapidly south through the nrn High plains this morning and should sweep into nrn Nebraska after sunrise. A reinforcing cold front will drop into nrn Nebraska Sunday and swrn Nebraska will remain in a bank of frontogenetically forced mid level cloudiness.
656 AM CDT Sat May 9 2020 For the 12Z TAFs, a cold front is forecast to move across the TAF sites this afternoon with north to northeast winds behind this boundary. A high amplitude upper level pattern featuring a sharp ridge of high pressure over the western states and a corresponding deep trof in the eastern part of the country will persist through Sunday afternoon, the net result being northwest flow aloft for our region during this time period. With moisture having been scoured out by the recent cold frontal passage plus another, weaker cold front expected to move across the area this afternoon and evening, dry weather is forecast to continue tonight through Sunday afternoon.
340 AM MDT Sat May 9 2020 Gusty northerly winds have pushed across the Denver area early this morning following the passage of a weak cold front. The high resolution models show little if any qpf this afternoon and evening. Clearing skies and dry conditions could allow temperatures to drop below freezing over the northeast plains of CO late tonight.
623 AM CDT Sat May 9 2020 The H5 upper low, that is forecast to bring showers and snow to the region, continues moving southeastward out of southern Saskatchewan into north-central North Dakota. Wet bulb temps are running a bit warmer than the previous guidance with lower 30s generally indicated in model soundings. As of the current guidance, the higher risk areas remain consistent with the previous forecast, and are expected to impact areas around the Devils Lake Basin. There is a transition from north-northwest flow to more of a quasi- zonal pattern as large scale troughing in the eastern US breaks down and slides eastward.
Above normal temperatures will continue today under a strong ridge of high pressure. Southerly flow will increase Sunday and pull up limited mid level moisture from northwest Mexico which should lead to some thunderstorms across Mohave and Lincoln counties as well as the higher elevations of Clark County.
819 AM EDT Sat May 9 2020 Snow showers will pass through the region this morning before high pressure builds across the region. As the day progresses, moisture will cut off from building high pressure in southern Ohio.