Aikyam-Lab/Synoptic-Bench huggingface dataset:
The main upper low over the eastern U. With the upper low pulling off to the east, our low level flow will finally switch around to the south on Saturday and usher in a rapid warmup into the mid/upper 80s along with an increase in low level moisture. Moisture will continue to increase late Saturday night with overnight lows about 15 degrees warmer than forecast for tonight along with some increased low cloud cover.
1242 PM PDT Fri Apr 8 2022 A cold front moves into the region today with more shower chances and windy conditions that persist into the weekend.
An upper level trough will continue to dominate the area as it slowly moves east through Saturday. At the sfc, strong high pressure building into the area has created a tight pressure gradient with gusty westerly winds of 30 to 35 mph.
1254 PM CDT Fri Apr 8 2022 A large upper low is centered across Wisconsin early this morning. High pressure ridge axis quickly moves across the area tonight. As the low tracks across Kansas Saturday night expect a cold front to surge southeast across the area.
An upper level long wave trough will move east across the western CONUS through Saturday. As for temperatures, the onshore flow will lead to slightly warmer lows tonight. Warmer temps are expected Saturday, especially across the western CWA where the driest conditions will be located.
***Freeze Warning Tonight*** Widespread sub-freezing temperatures tonight.
The one positive change we'll see today from the past couple of days is that we're finally starting to see some dry air work in on the back side of the low, with clear skies overnight up in northwest MN. This sun for Saturday will also send temperatures back up to the low 50s, something we've only done one time through the first 7 days of April.
Winds will decouple tonight, becoming light and variable as high pressure moves through SE Texas.
Approaching cold front is already in interior WA and OR this morning, with high clouds increasing ahead of it in our CWA. The cold front will pass through eastern Oregon this afternoon, and southwestern Idaho this evening with gusty west/northwest winds to follow.
This afternoon's analysis showed a closed low over northern Lower MI, resulting in northwest winds across the forecast area. As the closed low continues to lift northeast into Canada, moisture and jet energy on the backside of the low will keep the scattered light snow showers across the forecast area through at least late this evening. Clouds will slowly continue to decrease throughout Saturday as surface ridging gradually builds across the forecast area. This may leave warmer temperatures in central and north-central WI compared to far northeast and east-central WI.
An upper trough centered over the Great Lakes/Ohio Valley will shift eastward through tonight. An isolated thunderstorm is possible along with some small hail given low freezing levels. Deepening cold air will also support scattered snow showers across the higher terrain of the western and northern Alleghenies, with a dusting of snow possible on the summits and ridgetops.
200 PM PDT Fri Apr 8 2022 Very hot weather will continue today as the Santa Ana winds ease and high pressure continues across the Southwest. Onshore flow and a coastal eddy will return to bring back cooler weather over the weekend.
Look for a drop of 20 plus degrees with a strong cold front moving through tonight. The cold front moves through around midnight to early morning. In general, expect sustained winds of 20 to 30 mph with gusts of 40 to 50 mph especially for ridgetops along the eastern edge of the Snake Plain.
215 PM CDT Fri Apr 8 2022 A deep layer low pressure system with a closed low near the Great Lakes region will continue to eject out of the ArkLaMiss region this afternoon into the evening. Along with this trough, a strong mid/low- level jet will also begin to move east of Mississippi into Alabama, which should decrease winds throughout the evening into the overnight. Relative humidity values are overachieving in the south, where some areas are experiencing values in the lower to middle 20% range. Winds will begin to increase again in the later morning/early afternoon as the deep layer trough exits the region. /AJ/ Ridging aloft will continue to increase across the CWA over the weekend.
1250 PM PDT Fri Apr 8 2022 High pressure will weaken and move east of the area tonight and Saturday allowing for a significant cooldown to begin.
256 PM MDT Fri Apr 8 2022 Current surface analysis has high pressure over the area with a lee trough near the Bighorns. Upper level analysis shows the large low over the Great Lakes region, with a Ridge over the intermountain West. There is also a trough beginning to push into the Pacific Northwest. The upper level ridge axis will be centered over the area tonight, bringing in mild air and warmer temperatures for tonight and Saturday. A cold front will move slowly southeast through the area on Saturday, with brisk northwest winds developing behind it.
The earlier cold front has cleared the area and cooler and noticeably drier air is filtering into South Florida. However, much of the lower cloud cover will dissipate NW-SE (probably by the time you are reading this) this afternoon as the 850mb boundary passes leaving us with just some patchy cirrus for the remainder of the afternoon. A dry night is expected with low temperatures dipping well into the 50s over the much of the Interior while areas closer to the coast will remain in the low 60s. Although we may see a subtle increase in cloud cover with this feature the low-lvls will be sufficiently dry that we will remain precipitation-free.
Several reports received of wintry precipitation mixing in with rainfall across mid state region as these mid morning hours progress per cold temperatures aloft associated with upper level trough passage. Main upper level troughing influences will continue to move west to east across area as today progresses. VFR conditions expected for a few more hours, but look for the upper low to our north to influence our weather for the next 24-36 hours, bringing an MVFR deck to the area and scattered light showers starting around 13-14Z.
227 PM EDT Fri Apr 8 2022 An upper level trough will move into and across the area this afternoon into Saturday evening.
Cold temperatures well below freezing will be experienced area wide tonight into Saturday morning.
1032 AM CDT Fri Apr 8 2022 An upper level trough remains located over the Mid-South this morning. Current temperatures are in the mid 40s with sunrise temperatures expected to dip into the low 40s. We could still see few wrap around showers across west Tennessee today as a deep upper level low over the Great Lakes shifts slowly to the east. High temperatures today are expected to be 15-20 degrees below normal, in the low to mid 50s. Any freezing temperatures should be confined to northeast Arkansas and the Missouri Bootheel, but confidence is low that even that area will cool to freezing. High temperatures Saturday should be in the low to middle 60s.
402 PM EDT Fri Apr 8 2022 Several disturbances will keep precipitation chances and cooler temperatures in the forecast through Saturday.
These showers are occurring on the southwest side of large upper low currently over Michigan that will continue to move east tonight. Expect dry weather Saturday and Saturday night as subsidence sets in the the back side of the upper trough and an upper ridge currently over the Rockies builds into the Midwest.
231 PM CDT Fri Apr 8 2022 High pressure continues progressing eastward across the state for the remainder of the day today resulting in relatively warm temperatures in the 50s, sunny skies, and light winds.
Large stacked, closed low is currently centered across the Great Lakes and is slowly translating eastward. PWs are quite low, so I don't anticipate may showers despite how cold is in the atmosphere under this closed low. The low-level flow is beginning to mix down, and we are expecting gusts up to, and maybe a little higher than, 30 mph this afternoon. The deep upper trough axis rotates across The Midlands and CSRA on Saturday. Raditional cooling should lead to patchy frost in sheltered locations with lows in the lower to mid 30s.
209 PM EDT Fri Apr 8 2022 An upper level trough will move into and across the area this afternoon into Saturday evening.
(The rest of today ) Upper level low continued to hold over the Great Lakes region this morning with the backside of the upper trof axis still across Eastern Oklahoma and Northwest Arkansas. a weak vorticity lobe was moving southward along the backside of the upper trof through the region this morning. the upper level trof axis is progged to begin pushing off to the east and should exit this evening. gusty northwesterly winds will also continue into the afternoon hours and then should begin to weaken as the trof axis finally begins to shift eastward. The warmer conditions combined with the gusty winds and min RH values falling into the 20 percent range will continue to elevate fire weather concerns. The cooler temps should keep these locations from reaching Red Flag criteria.
306 PM CDT Fri Apr 8 2022 The pesky and persistent mid/upper trough over the Great Lakes area will continue to move slowly east and northeastward away from the area while a mid/upper ridge translates eastward across the Rockies and into the Central Plains region. As the mid/upper ridge emerges from the Rockies, we'll see rising heights/increasing thickness and rising temperatures across the region this weekend. Prior to the warm-up, we'll see an opportunity for radiational cooling tonight as the low level ridge axis translates over the area.
1112 AM MDT Fri Apr 8 2022 Current surface analysis shows high pressure moving into the region, with winds having finally diminished quite a bit across the area overnight. Upper level analysis shows large low now over the southern Great Lakes region, with ridge over much of the western US. Trough is located off the Pacific NW coast. Milder air returns for the next couple of days as the ridge moves east over the region later today into Saturday, along with a slow moving warm front. A cold front is progged to slowly move southeast through the area on Saturday, with brisk winds developing behind it.
We'll see a high pop/low qpf showery convection again today from the upper trof. Consistent modeling of sub freezing temps in our northwest warrants a freeze warning headline, per collaboration with our neighbors. Another headline is expected tmrw night, with freezing temps still possible far north, but better clearing/less wind making frost a better possibility for nearly the entire FA.
Deep troughing continues to be the main feature across the eastern CONUS. A closed low is centered across the Great Lakes region. However, the low-levels are rather dry with surface dewpoints currently in the low to mid 30s. Westerly winds will also be gusty at times gusting into the 15-25 mph range making it feel even cooler.
The cold front that passed through yesterday, will continue to track away to the southeast this afternoon. The region will be between this departing system, a ridge of high pressure to the west/southwest and a trough of low pressure that will pivot into southern GA late this afternoon. This trough will move in Tonight. While there is not enough moisture with troughs Tonight into Saturday, an increase in cloud cover is expected Tonight into Saturday morning. With cold advection enhanced by the trough, temperatures will trend below normal this period. Readings in the lower to mid 40s away from the coast will be common Tonight, while most locations stay below 70 Saturday.
304 PM CDT Fri Apr 8 2022 An upper level trough remains over the Mid-South this afternoon. The upper trough will gradually shift east tonight. High pressure will briefly build into the region Saturday.
1236 PM CDT Fri Apr 8 2022 (The rest of today ) Upper level low continued to hold over the Great Lakes region this morning with the backside of the upper trof axis still across Eastern Oklahoma and Northwest Arkansas. a weak vorticity lobe was moving southward along the backside of the upper trof through the region this morning. the upper level trof axis is progged to begin pushing off to the east and should exit this evening. gusty northwesterly winds will also continue into the afternoon hours and then should begin to weaken as the trof axis finally begins to shift eastward. The warmer conditions combined with the gusty winds and min RH values falling into the 20 percent range will continue to elevate fire weather concerns. The cooler temps should keep these locations from reaching Red Flag criteria.
155 PM EDT Fri Apr 8 2022 A large trough remains aloft over the region this afternoon while at the surface, a frontal boundary is south of Florida and high pressure is centered to our west. One other thing of note for tonight into Saturday is a reinforcing cold front that will push through the peninsula as the main trough continues to swing eastward.
Tonight, this cooler, drier airmass ought to radiate efficiently to colder temperatures once again in the 30s south to upper 20s north.
945 AM PDT Fri Apr 8 2022 Very hot weather will continue today as the Santa Ana winds ease and high pressure continues across the Southwest. Onshore flow and a coastal eddy will return to bring back cooler weather over the weekend.
254 PM CDT Fri Apr 8 2022 Surface analysis showed vertically stacked low pressure was centered over northeast Michigan early this afternoon, with high pressure stretching from the westernmost portions of the Norther Plains into eastern Colorado and New Mexico. As the vertically stacked low begins to get pushed eastward this evening, lift and moisture rotating around the low will begin to wane and will allow precip coverage to diminish. Despite the continued northwest winds, temperatures should recover nicely given the higher sun angle and longer days.
(Tonight) The upper trough that's been sitting over the central part of the country the past few days is finally sliding off to the east.
The big upper low that was over Wisconsin yesterday is now slowly moving across Lower Michigan with mostly rain showers. Colder air moving south on the back side of the low will allow for some wet snow overnight, but surface temperatures are marginal enough that any slushy accums should be limited to non-paved surfaces.
309 PM EDT Fri Apr 8 2022 Upper low to bring one last round of lake showers through the better part of the day on Saturday.
No changes to the high temperature were made. KS Chattanooga Airport, TN 36 55 35 72 49 / 10 0 0 0 0 Knoxville McGhee Tyson Airport, TN 36 51 33 67 48 / 30 40 0 0 0 Oak Ridge, TN 34 52 31 67 46 / 30 30 0 0 0 Tri Cities Airport, TN 33 46 30 61 40 / 60 60 20 0 0 TN.
526 PM MDT Fri Apr 8 2022 Upper level ridge axis leans over Western Colorado this evening with a shift eastward into the plains occurring overnight. This will open the door for more westerly and southwesterly flow by Saturday morning with tightening pressure gradients ahead of an incoming trough/cold front that is positioned to arrive late in the afternoon/early evening hours. Expect a gradual increase in mid and high level cloud cover through the day on Saturday, especially over our northern zones as the trough inches across the Great Basin. By early Saturday evening, expect convection to increase along the surface cold front as it advances in ahead of the main 500 mb trough.
311 PM MDT Fri Apr 8 2022 Upper level ridge axis leans over Western Colorado this evening with a shift eastward into the plains occurring overnight. This will open the door for more westerly and southwesterly flow by Saturday morning with tightening pressure gradients ahead of an incoming trough/cold front that is positioned to arrive late in the afternoon/early evening hours. Expect a gradual increase in mid and high level cloud cover through the day on Saturday, especially over our northern zones as the trough inches across the Great Basin. By early Saturday evening, expect convection to increase along the surface cold front as it advances in ahead of the main 500 mb trough.
Large upper low currently centered over Lake Huron will consolidate closer to James Bay through Saturday, as vort lobes continue to dive SSE from Lake Superior all the way into the base of the broader southeast CONUS trof. Steep lapse rates and deep saturation will allow rain to mix with or change over to snow at times, but the intensity won't be enough to have any impacts especially given air temps remaining above freezing. Dreary conditions will continue for much of Saturday as the ridge to our west doesn't start to win out until well into the afternoon. As a result, clearing sky cover and light winds will make for an efficient radiative cooling night, allowing temps to drop to the low 30s underneath a deep temperature inversion just off the sfc.
Even with winds and cloud cover, temperatures have already fallen into the low to mid 40s. As clouds continue to thin out overnight, temperatures will fall into the low to mid 30s areawide. /issued 304 PM CDT Fri Apr 8 2022/ An upper level trough remains over the Mid-South this afternoon. The upper trough will gradually shift east tonight. High pressure will briefly build into the region Saturday.
Current surface analysis has high pressure over the area with a lee trough near the Bighorns. Upper level analysis shows the large low over the Great Lakes region, with a Ridge over the intermountain West. There is also a trough beginning to push into the Pacific Northwest. The upper level ridge axis will be centered over the area tonight, bringing in mild air and warmer temperatures for tonight and Saturday. A cold front will move slowly southeast through the area on Saturday, with brisk northwest winds developing behind it.
749 PM EDT Fri Apr 8 2022 An upper level low will bring a final round of lake enhanced rain and or snow showers through the better part of tonight and Saturday.
With regards to changes in the overnight part of the forecast, I went ahead and bumped up snowfall totals in the highest elevations of the Smokies. CD Chattanooga Airport, TN 35 55 35 72 49 / 20 0 0 0 0 Knoxville McGhee Tyson Airport, TN 34 50 33 67 47 / 40 40 10 0 0 Oak Ridge, TN 33 51 32 68 47 / 40 30 10 0 0 Tri Cities Airport, TN 32 46 30 62 38 / 60 60 30 0 0 NC.
As the low system continues to trek eastward high pressure at the surface and aloft will move in and dominate the area for Saturday.
a clear sky is expected underneath an upper level ridge axis. much warmer air moves into the area under the ridge axis with high temperatures in the 75-83 degree range. For the overnight hours, a cold front moves through the area from the northwest. Low temperatures are expected to be in the lower to middle 30s behind the front with lower to middle 40s ahead of it.
Current temperatures are in the low to mid 60s under clear skies. Temperatures are expected to fall into the 50s after midnight with overnight lows in the low to mid 50s. Yet, another reinforcing "back-door" cold front will move across FL in the afternoon. Pleasant conditions continue with cooler than seasonal temps in the L70s near I-4 northward and M-U70s southward.
With clear skies and low dew points persisting overnight, radiative cooling will be quite effective and result in temperatures dropping into the low to mid 40s away from the coast. They will increase again mid to late morning, but will not be nearly as strong and/or gusty as the past couple of days as a ridge of high pressure traverses the area.
The pesky and persistent mid/upper trough over the Great Lakes area will continue to move slowly east and northeastward away from the area while a mid/upper ridge translates eastward across the Rockies and into the Central Plains region. As the mid/upper ridge emerges from the Rockies, we'll see rising heights/increasing thickness and rising temperatures across the region this weekend. Prior to the warm-up, we'll see an opportunity for radiational cooling tonight as the low level ridge axis translates over the area.
550 PM CDT Fri Apr 8 2022 (Tonight) The upper trough that's been sitting over the central part of the country the past few days is finally sliding off to the east.
/issued 304 PM CDT Fri Apr 8 2022/ An upper level trough remains over the Mid-South this afternoon. The upper trough will gradually shift east tonight. High pressure will briefly build into the region Saturday.
Regional satellite picture shows clouds at 10-15k feet arriving from the west, associated with the warm conveyor belt of a Pacific Northwest trough. At the surface, a low pressure center was over southeast Alberta, while radar returns within the warm conveyor belt were spread across southern Saskatchewan. High pressure continues progressing eastward across the state for the remainder of the day today resulting in relatively warm temperatures in the 50s, sunny skies, and light winds.
459 PM MDT Fri Apr 8 2022 Current surface analysis has high pressure over the area with a lee trough near the Bighorns. Upper level analysis shows the large low over the Great Lakes region, with a Ridge over the intermountain West. There is also a trough beginning to push into the Pacific Northwest. The upper level ridge axis will be centered over the area tonight, bringing in mild air and warmer temperatures for tonight and Saturday. A cold front will move slowly southeast through the area on Saturday, with brisk northwest winds developing behind it.
(The rest of tonight) At long last, winds are subsiding across the area this evening as deep upper trough moves off to the east and high pressure at the surface makes a brief visit. With clear skies and light winds and a very dry airmass in place, widespread freezing temps expected overnight, with some normally colder spots potentially reaching mid 20s by morning.
This is based on regional radar mosaics, ir satellite loops and surface observations, all of show an area of precipitation ahead of the upper cold trough that comes through our area during the overnight hours. Upstream air temperatures are below freezing and our hi-res model forecast bring the below freezing surface temperature through the CWA overnight. The big upper low that was over Wisconsin yesterday is now slowly moving across Lower Michigan with mostly rain showers. Colder air moving south on the back side of the low will allow for some wet snow overnight, but surface temperatures are marginal enough that any slushy accums should be limited to non-paved surfaces.
They will increase again mid to late morning, but will not be nearly as strong and/or gusty as the past couple of days as a ridge of high pressure traverses the area.
Surface analysis showed vertically stacked low pressure was centered over northeast Michigan early this afternoon, with high pressure stretching from the westernmost portions of the Norther Plains into eastern Colorado and New Mexico. As the vertically stacked low begins to get pushed eastward this evening, lift and moisture rotating around the low will begin to wane and will allow precip coverage to diminish. Despite the continued northwest winds, temperatures should recover nicely given the higher sun angle and longer days.
A big upper level low will keep patchy light rain/snow/sleet showers over the area this evening, with mainly snow showers for the Upper Cumberland overnight. Upper low will continue to spin showers, possibly mixed with sleet/snow down across the mid-state through evening, and across the plateau in the late night hours.
A line of light showers with a chance for isolated thunderstorms has developed along the cold front in northern Elko county. Look for much cooler temperatures tomorrow as high temperatures will be in the 50s across northern NV, and 60s to low 70s across central NV.
Look for much cooler temperatures tomorrow as high temperatures will be in the 50s across northern NV, and 60s to low 70s across central NV.
301 PM MST Fri Apr 8 2022 Well above normal temperatures in the mid 90s to near 100 will continue across the lower deserts Saturday.
Isolated showers have developed along and near a cold front that is moving southeast through the area this evening.