Aikyam-Lab/Synoptic-Bench huggingface dataset:
336 AM EDT Thu Apr 15 2021 A few cold fronts will move across the region through tonight. Cool and dry high pressure will follow through the end of the week. A cold front is currently moving east across the region, stretching from the southern Piedmont to the northern Coastal Plain. A secondary cold front, currently along the Appalachians, will move east across the region later today, ushering in a drier airmass and lowering dewpoint temps into the 30s by tonight. Highs today will be near seasonal normals, ranging from the upper 60s NW to the low 70s S. Temperatures tonight will radiationally cool to the low 40s NW and the mid-40s SE, with isolated cold spots in the upper 30s. Zonal flow aloft will become slightly more northwesterly as a weak ridge builds from the Midwest to the Mid-Atlantic.
South of the boundary, including New Orleans, temperatures are in the lower 70s, with temperatures in the lower 60s north of the boundary.
As upper low pivots through the day, best deep moisture advection and convergence will become focused along a deformation zone from ern WY through far swrn SD and into nwrn NE. Snowfall rates will likely increase as a secondary mid-upper low develops over ern CO tonight; however, it appears that the primary deformation band on the nrn periphery of this disturbance will remain south of the SD/NE state line.
120 AM EDT Thu Apr 15 2021 A cold front will bring a chance of showers to the region late tonight into Thursday followed by drier and cooler conditions. Near normal temperatures are expected this weekend with low rain chances as a weak low pressure system moves offshore. Breezy seabreeze winds are seamlessly merging into a 40 knot low level jet ahead of an area of low pressure moving eastward across the NC/VA border. Surface winds along the coast should diminish after midnight as the low moves offshore. A mild night ahead of an approaching cold front, tonight's lows about equidistant from climatological lows as highs.
358 AM EDT Thu Apr 15 2021 A few cold fronts will move across the region through tonight. Cool and dry high pressure will follow through the end of the week. A cold front is currently moving east across the region, stretching from the southern Piedmont to the northern Coastal Plain. A secondary cold front, currently along the Appalachians, will move east across the region later today, ushering in a drier airmass and lowering dewpoint temps into the 30s by tonight. Highs today will be near seasonal normals, ranging from the upper 60s NW to the low 70s S. Temperatures tonight will radiationally cool to the low 40s NW and the mid-40s SE, with isolated cold spots in the upper 30s. Zonal flow aloft will become slightly more northwesterly as a weak ridge builds from the Midwest to the Mid-Atlantic.
1104 PM CDT Wed Apr 14 2021 Key messages: - Widespread frost expected tonight as temperatures dip into the lower 30s.
302 AM CDT Thu Apr 15 2021 Water vapor satellite this morning shows the upper level low has moved to over northern Lower Michigan early this morning. Some drying is seen in the water vapor imagery over Lake Superior into southern Ontario in association with another mid-level short wave trough rotating around the low.
/Issued 932 PM EDT Wed Apr 14 2021/ Weak cold front hasn't pushed farther south this evening. Cooler temperatures expected for Thursday and Thursday night.
329 AM CDT Thu Apr 15 2021 (Issued 327 AM CDT Thu Apr 15 2021) Today and Tonight: The stalled upper low is finally on the move with the center now over far NE Michigan this morning. Slightly warmer today with highs in the lower 50s for most. Clearing skies tonight with lighter winds could allow for another night where temps hit freezing.
154 AM PDT Thu Apr 15 2021 Temperatures will gradually warm the next few days as low pressure slowly exits the region.
The high pressure system currently east of Florida and providing our area with a hefty amount of subsidence, will slide to the east and elongate into a broad ridge. The Florida Keys will remain in the western periphery of the ridge. In the meantime, a weak cold front currently draped across the southeastern United States will slowly slide south, but it will only reach central Florida in the next couple of days.
Mid level moisture associated with this trough has largely exited the area and is in tandem with precipitation now located in southern AR.
319 AM CDT Thu Apr 15 2021 The upper level low that has been anchored over the Great Basin region finally begins to have forward progression this morning. The low will drift east before eventually opening up across the high plains region tomorrow morning.
Weak low pressure will track east along this boundary this evening before moving out into the Virginia Capes Thursday.
1226 AM MDT Thu Apr 15 2021 Stationary upper low continues to spin over the Great Basin this afternoon.
Expect most of the rain to be east of the Tennessee Valley by midnight, but some of these showers could get hung up on the higher terrain, so have kept PoP chances in the southern Appalachian Mountains into early tomorrow morning. SR Chattanooga Airport, TN 67 44 66 49 65 / 0 0 0 30 40 Knoxville McGhee Tyson Airport, TN 64 40 65 47 61 / 0 0 0 10 30 Oak Ridge, TN 64 39 66 46 62 / 0 0 0 10 30 Tri Cities Airport, TN 61 36 63 41 60 / 0 0 0 0 30.
421 AM EDT Thu Apr 15 2021 An approaching upper trough and cold front will bring isolated to scattered showers into the region tonight into Thursday morning.
After a day of much cooler temperatures, some wind, and clearing skies, we will be in for a night of near calm winds, clear skies, and cold temperatures.
346 AM CDT Thu Apr 15 2021 Cyclonic flow continues for yet another day with the upper low over the Great Lakes crawling east. Another upper low over the western U.
For 06Z Aviation discussion below The upper low this afternoon is centered over the Straights of Mackinac. Tonight, the cyclonic flow pushes off to the east and for the rest of the short term period, we'll be stuck in a no-man's land between an upper low over the eastern Great Lakes and another over the central Rockies.
GOES16 mid level water vapor imagery captures the low pressure system over the northern Great Lakes Region well with the associated dry slot to the north of central Indiana. These conditions won't last too long as an upper low over to the north will increase cloud coverage again tonight. As the upper low pushes further east late tomorrow, winds will diminish by tomorrow night.
Upper low will continue its slow drift ESE, eventually picking up speed later today reaching the NJ coast by 12Z Fri. The clouds and additional CAA will keep temps below normal, generally in the upper 40s for most locations (SW quarter or so should edge into the lower 50s where some sunshine will be seen). Clearing skies and diminishing winds will allow lows to drop into the low to mid 30s. Gulf flow will still be cut off so not expecting a lot of rainfall with anything confined to the cold front.
312 AM CDT Thu Apr 15 2021 The main concern this forecast package will revolve around frost and freezing conditions this morning. With a few more hours of good radiational cooling conditions, temperatures are expected to bottom out just below freezing across northwestern Missouri. Tonight, a upper level trough over the Great Basin region will finally begin shift east into the western High Plains.
High temperatures will be in the lower 70s for most locations with an exception of a patch of temperatures in the upper 60s across the extreme northwest. As we enter into the night time, a rain free evening will prevail however shortly after midnight, rain chances will increase from west to east as a cold front moving across the Plains, begins to approach the ArkLMiss.
A cold front moving to the SE across the Tennessee Valley was bringing a notable cool change in area temperatures. After highs earlier in the low/mid 70s, 8 PM readings have cooled into the mid 50s to around 60. The cooler trend will continue, with lows by sunrise Thursday in the upper 40s to around 50. As a strong upper low shifts east through the Great Lakes, high pressure will be dropping into the northern Plains with a ridge axis south through the lower MS Valley. the lower clouds will clear off by mid to late morning, allowing for ample afternoon sunshines. Despite the cold advection, the advantage of longer daylight hours will help temperatures warm into the middle 60s for most areas (a bit cooler in southern TN/northeast AL higher elevations).
258 AM CDT Thu Apr 15 2021 The CONUS is currently being dominated by two closed upper lows, one acrs the central Intermountain region, and the other region-closer by spiraling acrs the western GRT LKS.
345 AM EDT Thu Apr 15 2021 A series of troughs will likely persists over our region through this weekend.
341 AM CDT Thu Apr 15 2021 Cooler than normal temperatures for the forecast period and generally dry weather.
Surface winds were from the north, and helping to keep the lower trop mixed a bit.
Plenty of cloud cover under the high, extending from ND well into south central Canada. Leaned toward the cooler side of guidance with highs only in the upper 30s to low 40s.
Cooler today behind the cold front with temps in the upper 50s to mid 60s, which 5 to 8 degrees below normal.
314 AM EDT Thu Apr 15 2021 Ridging aloft and inverted surface ridging extending from expansive Canadian high pressure will result in a pleasant but cool day today. Latest surface analysis places a string of low pressure centers from NY SW to Cincinnati with the cold front currently extending NE-SW across LEX to BNA. 5H analysis shows two closed lows, one over the Intermountain West and the other over the Great Lakes, reminiscent of the eyes of Dr.
205 AM MDT Thu Apr 15 2021 The easterly moist flow combined with upper level low pressure that have been producing areas of light snow across north-central Montana will give way to increasing northerly flow and a more showery regime by this afternoon.
335 AM CDT Thu Apr 15 2021 A western closed upper low pressure system will be heading east across Utah towards Colorado today.
1036 PM CDT Wed Apr 14 2021 Mostly cloudy and cool conditions will continue to dominate the region through Thursday, with the main change from recent days being even lighter winds as a low level ridge axis moves east across the Dakotas. Clouds across the southwest half of the forecast area may decrease for a time this evening, but with north-northeast low level flow ahead of the ridge axis, seems reasonable that the lower clouds over our northeast would expand back to the south and west later tonight into Thursday. In addition, will see higher clouds advancing into the western areas later Thursday ahead of trough axis pushing east out of the Rockies. However, even areas with more extensive cloud cover are expected to drop back below freezing again tonight, with lows largely mid 20s-around 30.
537 AM MDT Thu Apr 15 2021 A complicated forecast scenario continues early this morning, with a vigorous closed upper low currently drifting eastward across the Great Basin per GOES-16 WV satellite imagery.
The lull in precipitation will be short-lived, however, as an upper trough begins to eject into the central US today. Elevated instability will initially be very limited today and confined to far southwestern OK and western north TX, but will increase some tonight as mid-level lapse rates steepen with the approach of the trough. Therefore, expect thunderstorm coverage to expand overnight along and ahead of a cold front and move eastward Friday morning.
420 AM MDT Thu Apr 15 2021 Overview: A broad upper level low. An associated lee cyclone will develop in southeastern CO and northeastern NM this evening, tracking E-ESE across the TX Panhandle tonight and along/near the TX/OK border (Red River) on Friday. as H85-H7 flow responds to a tightening gradient on the eastern periphery of the developing lee cyclone.
956 AM EDT Thu Apr 15 2021 High pressure over the northern Plains will extend into the region through Friday night.
and Friday WV imagery showed an upper level low over far northeast Lower MI. Moist north flow off Lake Superior was also generating some light drizzle/freezing drizzle over far north central WI. Expect any lingering precipitation over the far north and east to dissipate early this morning, as the upper low continues to shift east of the region. Expect clouds to gradually erode from west to east tonight, as high pressure edges into the western Great Lakes. The exception will be over Door County, where highs will only be in the lower to middle 40s.
Carried VCTS for the lower Acadiana terminals, with VCSH everywhere else due to lack of convection further west.
1035 AM EDT Thu Apr 15 2021 Low pressure will pass to the southeast this afternoon.
559 AM CDT Thu Apr 15 2021 Water vapor satellite this morning shows the upper level low has moved to over northern Lower Michigan early this morning. Some drying is seen in the water vapor imagery over Lake Superior into southern Ontario in association with another mid-level short wave trough rotating around the low. Weakening upper level ridging will cross the area on Friday with moderating 850mb temps overhead. All this will allow for a noticeably warmer day with highs in the 50s to near 60, closer to normal for mid April.
The lower heights over the southeastern United States have nudged the mean layer ridging to the southwest towards Central America.
404 AM PDT Thu Apr 15 2021 A low pressure system over the Great Basin will continue to lead to stronger onshore winds across southern California along with a fairly deep marine layer. An upper ridge will gradually build into the area from the northwest through the weekend.
Just after this wave comes through, the cold front will arrive and provide lift for more showers.
Mid level moisture associated with this trough has largely exited the area and is in tandem with precipitation now located in southern AR. Continued agreement among the vast majority of guidance shows that a strong upper low will eject onto the central Plains later today into tomorrow bringing us high chances for showers and some storms starting as early as this afternoon with precipitation continuing through Friday before ending Friday night.
A series of troughs will likely persists over our region through this weekend. This low should then move farther northeastward to near the Canadian Maritimes this weekend. A mid level low pressure system will slow drift from the upper Great Lakes region today into the eastern Great Lakes tonight.
559 AM CDT Thu Apr 15 2021 Clouds have been moving through the area this morning as the closed upper low begins exiting the region. The closed upper low that's been churning over the Upper Midwest for multiple days has finally started shifting eastward as it rejoins the flow aloft. At the surface, high pressure centered over the Northern Plains is stretching across the mid-section of the country and influencing conditions here in central Illinois. The cold air mass associated with this high will spread further south than last night, bringing near freezing low temperatures into the entire CWA. Winds will be noticeably lighter today as the 850 mb jet associated with the closed low shifts east.
714 AM EDT Thu Apr 15 2021 An upper low will drift down from the northwest and slowly cross PA through Friday. Colder air will sweep across the region today and turn the temperatures much cooler for the next few days. Some snow will mix in with rain showers over the higher elevations of the Alleghenies and Laurels tonight with a light accumulation possible by daybreak Friday.
833 AM EDT Thu Apr 15 2021 Scattered showers later today ahead of a cold front will be followed by drier and cooler conditions Friday.
Basically temperatures will be in the 40s though midnight with still temps and dew points in the 30s overnight making it hard for temperatures to get well below freezing for any length of time. Additionally the Minor to Moderate impacts noted by Winter Storm Severity Index are mainly focused over the high plains region of northwest Kansas and into Nebraska.
/issued 341 AM CDT Thu Apr 15 2021/ Cooler than normal temperatures for the forecast period and generally dry weather.
332 AM MDT Thu Apr 15 2021 A cut off upper low over Nevada/Utah will be our weather maker today. Bufkit profiles do support a chance of freezing drizzle in Wheatland County this morning, but this should be light enough and localized enough to limit impacts.
Temperatures will trend warmer today, particularly across northwest Montana and north central Idaho, where mostly sunny skies are expected.
/issued 319 AM CDT Thu Apr 15 2021/ The upper level low that has been anchored over the Great Basin region finally begins to have forward progression this morning. The low will drift east before eventually opening up across the high plains region tomorrow morning. Pacific moisture will be drawn up ahead of the cold front and, depending on the trajectory of the upper level low, the Rolling Plains could see one last shot of precipitation Friday morning ahead of the frontal passage.
342 AM MDT Thu Apr 15 2021 Overnight low stratus, patchy freezing drizzle, and patchy fog will linger into the morning hours across NE Montana. Light rain and snow showers will remain possible at times through the day as low pressure tracks east across Wyoming. Any precipitation will shift south for Friday as high pressure moves into southern Saskatchewan.
Otherwise, temperatures will remain above normal through the period with highs ranging from the mid to upper 80s near the coast to the low to mid 90s farther inland. Lows tonight will be in the low to mid 70s under mostly cloudy skies and patchy fog.
651 AM EDT Thu Apr 15 2021 High pressure over the northern Plains will extend into the region through Friday night.
Frontal boundary stalled along the Gulf coast will shift back to the north late tonight into Friday, with low pressure developing along it. The aforementioned low pressure will drag a cold front through the region Friday night, with precip ending behind it and drier air moving in.
547 AM CDT Thu Apr 15 2021 The main concern this forecast package will revolve around frost and freezing conditions this morning. With a few more hours of good radiational cooling conditions, temperatures are expected to bottom out just below freezing across northwestern Missouri. Tonight, a upper level trough over the Great Basin region will finally begin shift east into the western High Plains. This will lead to a cool and cloudy day on Friday with highs in the low to mid 50s. Friday evening into Friday night, the upper level trough will move into the region continuing shower chances.
648 AM EDT Thu Apr 15 2021 Scattered showers later today ahead of a cold front will be followed by drier and cooler conditions Friday.
CAA behind the front that moved through overnight will continue to bring much cooler temperatures today with highs reaching the upper 50s to upper 60s. SR Chattanooga Airport, TN 69 43 67 49 62 / 0 0 0 30 50 Knoxville McGhee Tyson Airport, TN 66 40 65 47 59 / 0 0 0 20 60 Oak Ridge, TN 65 39 66 46 59 / 0 0 0 20 50 Tri Cities Airport, TN 61 35 62 41 59 / 0 0 0 0 40.
412 AM CDT Thu Apr 15 2021 Clouds have been moving through the area this morning as the closed upper low begins exiting the region. The closed upper low that's been churning over the Upper Midwest for multiple days has finally started shifting eastward as it rejoins the flow aloft. At the surface, high pressure centered over the Northern Plains is stretching across the mid-section of the country and influencing conditions here in central Illinois. The cold air mass associated with this high will spread further south than last night, bringing near freezing low temperatures into the entire CWA. Winds will be noticeably lighter today as the 850 mb jet associated with the closed low shifts east.
1000 AM EDT Thu Apr 15 2021 Scattered showers later today ahead of a cold front will be followed by drier and cooler conditions Friday.
319 AM MDT Thu Apr 15 2021 The easterly moist flow combined with upper level low pressure that have been producing areas of light snow and even some freezing drizzle and fog across north-central Montana, will give way to increasing northerly flow and a more showery regime by this afternoon.
With high pressure over the area, the weather is forecast to remain quiet through the TAF period. Otherwise, high pressure is keep the weather quiet over the area for the end of the week. Otherwise, high pressure will begin to gradually shift into the Western Atlantic in response to a frontal boundary entering the FL panhandle today, but remain generally in control of the pattern across South Florida through the remainder of the work week. This location shift of the ridge axis will increase coverage of warm temps (upper 80s to near 90) area-wide each afternoon as winds veer out the south to southwest through the period. And while dry conditions will stick around, additional moisture in the lower levels could result in shallow, patchy fog again Friday morning.
1036 AM EDT Thu Apr 15 2021 Scattered rain showers are expected this afternoon, with both rain and snow showers possible north and in the ridges tonight and Friday morning as low pressure crosses. Thermal profiles suggest a transition to rain/snow mix, with snow limited to the higher elevations and portions of the I-80 corridor. Pressure heights will slowly rise as the upper low pulls farther east toward the New England coast Friday.
Closed low that has ushered in NW flow over our area will begin an eastward progression today, and is expected to be out of the west coast by Friday morning. A robust ridge of high pressure will take its place, allowing for warming through the weekend.
The easterly moist flow combined with upper level low pressure that have been producing areas of light snow and even some freezing drizzle and fog across north-central Montana, will give way to increasing northerly flow and a more showery regime by this afternoon.
859 AM CDT Thu Apr 15 2021 (Issued 859 AM CDT Thu Apr 15 2021) A breezy day is ahead as low pressure remains stationary over the eastern Great Lakes. Boxell (Issued 327 AM CDT Thu Apr 15 2021) Today and Tonight: The stalled upper low is finally on the move with the center now over far NE Michigan this morning. Slightly warmer today with highs in the lower 50s for most. Clearing skies tonight with lighter winds could allow for another night where temps hit freezing.
Temps across southeast Texas are in the low 60s along with the dew points while in south central Louisiana temps are in the mid to upper 60s in the warmer air mass. Having said that the true warmer air lays just to the south in the nearshore waters where temps are in the 70s. The next round of storms will be tomorrow as a new cold front will approach from the northwest moving down the eastern slopes of the rockies and into Texas attm.
Plenty of cloud cover under the high, extending from ND well into south central Canada. Leaned toward the cooler side of guidance with highs only in the upper 30s to low 40s. Friday night through next Thursday, look for generally cooler than average temperatures with minimal chances for weather impacts across the period.
633 AM CDT Thu Apr 15 2021 A mid/upper trough over the Central Great Basin area early this morning will move slowly eastward into the Central Rockies tonight before emerging over the Central Plains on Friday.
611 AM CDT Thu Apr 15 2021 Cyclonic flow continues for yet another day with the upper low over the Great Lakes crawling east. Another upper low over the western U. Highs, therefore, should be warmer and closer to normal in the 50s.
951 AM EDT Thu Apr 15 2021 A series of troughs will rotate across the region through the weekend. Lake effect cloud cover will keep northeast Ohio into northwest Pennsylvania cooler. Upper level low over Lake Huron will settle southward through the day with a piece of jet energy rotating through the northwesterly flow aloft. Although the southern CWA may see enough sunshine this morning to get into the lower 50's. A mid level low pressure system will slow drift from the upper Great Lakes region today into the eastern Great Lakes tonight.
519 AM MDT Thu Apr 15 2021 Stationary upper low continues to spin over the Great Basin this afternoon.