Aikyam-Lab/Synoptic-Bench huggingface dataset:
The upper low that has been off the coast of California has made its way over southern California. Meanwhile a deep and elongated trough will continue to slowly rotate southeast out of Canada through the Upper Mississippi Valley and Great Lakes Regions. The northern deep trough will force the California low to remain quasi-stationary through at least tomorrow night before beginning its pilgrimage east into the desert southwest.
Think the James Valley will cool to the lower 20s overnight. Otherwise, warmer air returning on ll southwest winds will result in a nice rebound from today with highs in the 50s and lower 60s.
106 PM PDT Thu Apr 9 2020 A final round of rain and snow can be expected this afternoon and tonight as an area of low pressure slowly exits the region.
432 PM EDT Thu Apr 9 2020 Cooler and much drier air move into the region today behind a cold front today, and will carry into this evening.
635 PM CDT Thu Apr 9 2020 A tight pressure gradient between yesterday's cyclone and a strong anticyclone over the Northern Plains resulted in very gusty winds across the region today. These winds ushered much cooler air into the region, with today's highs roughly 30 degrees cooler than yesterday's records. Despite considerably lighter winds tonight, the combination of continued cold air advection and clear skies will allow temperatures to fall to near freezing across the area. However, today's forecast guidance has come in a bit cooler, with upwards of 90 percent of the guidance showing temps at or below freezing for several of our central IL counties, as well as the counties just to the west of the St.
915 PM CDT Thu Apr 9 2020 Current forecast in good shape this evening as cool high pressure at tha surface continues to settle southward towards the forecast area.
842 PM EDT Thu Apr 9 2020 Warm westerly flow will continue overnight ahead of a cold front that will move through east central FL on Friday. A wind shift will occur on Friday as winds become northerly and gusty behind the surface cold front.
Models have their differences for later tonight and into Friday, but appears the low end VFR cigs are likely, perhaps dropping into MVFR at times. Cooler. Another cold front will push south, across West Central Texas, tonight and bring winds from the north and cooler temperatures. Lows tonight and highs tomorrow will therefore be cooler than those of previous days. Rain and Another Cold Front.
Otherwise, dry and warmer with locally gusty northerly wind at times in the Central Valley. Cloud cover should keep temperatures cooler than yesterday in the low to upper 60s, especially in the northern Sacramento Valley where temperatures reached the mid 80s yesterday. Closed upper level low pressure system is centered over the central California/Nevada border. Showers have diminished over NorCal late this morning, but impulses along the northern portion of the closed low will bring another chance of showers to the area later this afternoon through tonight.
In fact, as the ongoing convection continues to diminish overnight, sfc ridging over the Plains and Mid MS Valley will build S into the region, thus reinforcing the drier low level air mass in place.
On Friday a cold front will approach from Canada bringing northwest winds and a chance for rain and snow by afternoon northwest. The Northern Plains are sandwiched between cyclonic and anticyclonic flow regimes this afternoon, with a closed low circulation over eastern Ontario and upper level ridge axis extending from northwest Montana into northern Saskatchewan. 18Z surface analysis shows high pressure sitting over western North Dakota/eastern Montana. Despite the lack of clouds farther west, the boundary layer has had a hard time mixing today, leaving temperatures in the lower to mid 30s thus far. By Friday afternoon, the attendant cold front will be pushing into northern North Dakota. The cold front will continue to move south across the state Friday night, accompanied by chances for rain changing over to snow as surface air temperatures cool.
634 PM CDT Thu Apr 9 2020 (Today and tonight) The cold front that passed through our area is currently south of the Red River, though overnight temperatures have been slow to cool. Cooler temperatures, in the 50's, have settled into portions of northern and western OK.
1000 PM CDT Thu Apr 9 2020 Water vapor satellite early this afternoon shows a potent short wave trough moving across the Upper Midwest. This activity is expected to dissipate rather quickly very late this afternoon into the early evening as the short wave trough moves past the area allowing the forcing/lift to diminish. After that, the clouds should also dissipate rather quickly leaving behind mostly clear skies as an area of high pressure moves from the west. While the center of the high will slip south of the area Friday, the northern extent of the ridge axis will slide across the area.
Showers will be diminishing this evening as a low pressure system weakens tonight and Friday.
Generally zonal flow will continue aloft over the northern Gulf coast as a northern stream trough progresses over the Great Lakes, Ohio Valley, and on through the northeastern CONUS. High pressure will then build over the region from the northwest through Friday. By Friday night, this high pressure will begin to shift off to the east as a low pressure system develops over the southern Plains. A much cooler day is on tap for tomorrow, with highs in the upper 60s to lower 70s. A chilly night is then likely Friday night as temperatures dip into the mid to upper 40s inland to the lower to mid 50s near the the coast.
715 PM EDT Thu Apr 9 2020 Precipitation chances should continue through part of Friday under upper level low pressure.
Scattered snow/graupel showers associated with the main upper low over Ontario will gradually come to an end from west/northwest to east/southeast this evening. As the surface pressure gradient relaxes behind the departing cold front, surface winds will also gradually diminish below 10 knots overnight and clouds will clear. On Friday the trough shifts east of the area and we see south/southwest winds return. Therefore we should see a notably warmer day with highs in the upper 40s to mid 50s, albeit still cooler than normal for early April.
335 PM MDT Thu Apr 9 2020 Dry conditions will continue into Friday morning with an increasing chance of precip moving into Friday afternoon as a cold front moves south. Temps will warm quite a bit due to downsloping ahead of the front with cooler temps behind.
619 PM CDT Thu Apr 9 2020 Today's forecast concerns focus on temperatures, as they will be jumping up and down over the next 4 days, with Freezing warning needed at times and some precipitable weather over the weekend. However, this will also result in good radiational cooling overnight, which will allow widespread sub- freezing temperatures by Friday morning.
820 PM EDT Thu Apr 9 2020 Precipitation chances should continue through part of Friday under upper level low pressure.
Lows tonight will drop into the low 30s, with highs on Friday in the mid 40s.
Large low pressure system will wobble over southern California through Friday, producing additional precipitation in the mountains and desert of Kern County. High pressure will build into California this weekend for dry and warmer weather. Stubborn upper low continues to meander about with water vapor satellite imagery indicating the center of the low is now over the Southern Sierra Nevada around Mount Whitney.
1047 PM EDT Thu Apr 9 2020 High pressure dominates our weather at both the surface and aloft. Though it is weakening, a flat upper ridge axis still holds on over the southern Gulf this evening, with the observed 500 mb height of 5890 meters on the KEY evening sounding. The flat upper ridge over the southern Gulf will weaken further on Friday as a broad upper trough swings through the Southeast U.
Short wave energy topping the shallow upper ridge will move east across our region tonight and early Friday. A cold front will approach from the northwest and looks to be sitting across the SE Al counties as of 9PM ET. Behind it, air is cooling but more notably is the quick drop in dew points into the lower 50s. That's still above normal, but high highs Friday will only be in the upper 60s north to lower 70s south, some 20 degrees cooler than today.
/issued 304 PM CDT Thu Apr 9 2020/ Drier and cooler weather will prevail through the end of the week.
500mb RAP analysis shows a closed low over southeastern California and southern Nevada with the mid-level water vapor indicating dry air wrapping around the south and east side of the low with moisture along the north and west side.
Much cooler air will advect into the CWA tonight with overnight lows generally in the 30s and 40s.
500 PM CDT Thu Apr 9 2020 Water vapor satellite early this afternoon shows a potent short wave trough moving across the Upper Midwest. This activity is expected to dissipate rather quickly very late this afternoon into the early evening as the short wave trough moves past the area allowing the forcing/lift to diminish. After that, the clouds should also dissipate rather quickly leaving behind mostly clear skies as an area of high pressure moves from the west. While the center of the high will slip south of the area Friday, the northern extent of the ridge axis will slide across the area.
/issued 228 PM CDT Thu Apr 9 2020/ Have an upper ridge over the area with a cut off low over Srn CA/Srn NV.
Models have their differences for later tonight and into Friday, but appears the low end VFR cigs are likely, perhaps dropping into MVFR at times. /issued 304 PM CDT Thu Apr 9 2020/ (Tonight and Friday) Another cold front will push south, across West Central Texas, tonight and bring winds from the north and cooler temperatures. Lows tonight and highs tomorrow will therefore be cooler than those of previous days.
High pressure at the surface will drift southeast with south to southwest winds at the surface developing through the day. Low pressure begins to organize over the Western High Plains tonight into Saturday morning. Will also be dealing with marginal surface temperatures in the lower 30s as well as warmer ground.
CDG Chattanooga Airport, TN 60 38 68 52 68 / 0 0 0 80 90 Knoxville McGhee Tyson Airport, TN 57 36 67 49 67 / 0 0 0 70 90 Oak Ridge, TN 57 36 66 50 67 / 0 0 0 70 90 Tri Cities Airport, TN 53 31 62 44 65 / 0 0 0 50 90 NC.
A high pressure will build into the area Friday into early Saturday.
A little more downslope will lead to warmer temperatures each day successively warmer in advance of a strong cold front that has been expected for Saturday night. Additionally, on Saturday the 850 mb wind field is weaker, so even with warmer winds and likely low relative humidity, the surface winds would likely fall short of critical fire weather conditions.
High pressure will gradually build into the region Friday and pass east of the Ohio Valley Saturday.
Should see a nice recovery in temperatures on Friday as return flow draws warmer air into the region. Conditions are expected to turn cooler on Saturday as cold front moves through the forecast area, and northeast winds increase.
Large scale flow this morning consisting of a broad upper trough covering the eastern half of the CONUS while a cutoff low was centered over southern CA.
/issued 228 PM CDT Thu Apr 9 2020/ Have an upper ridge over the area with a cut off low over Srn CA/Srn NV. This low will wobble around Friday before moving East Saturday across AZ and NM.
As high pressure filters in from the west the pressure gradient will remain tight into tomorrow.
312 AM CDT Fri Apr 10 2020 Temperatures are slowly creeping down towards the freezing mark during the predawn hours as winds continue to relax. Highs on Saturday should be warmer despite the showers and cloud cover. Most locations should still warm into the lower to perhaps middle 60s as a low-level warm advection regime increases.
258 AM EDT Fri Apr 10 2020 A predominant zonal flow sets up over Florida as a closed upper low sits over Maine with upper trouging extending through the New England states southwest to Tennessee. Weak upper ridging extends northward through the central U. Another upper low spinning over southwest California will eject eastward by late Saturday as an open trough progressing farther to the east by the end of the weekend. This trough will lend support to the next significant weather system expected to influence the eastern half of the U. On the surface, high pressure has shifted south over Cuba.
321 AM CDT Fri Apr 10 2020 Despite the spring-like conditions today, expect a chilly night tonight with overnight lows falling into the low to mid 30s, especially across the plateau.
This is dropping temperatures to around freezing throughout central Illinois.
332 AM EDT Fri Apr 10 2020 Light rain and snow showers will taper off this morning, with lingering snow showers in the higher elevations through early afternoon.
137 AM EDT Fri Apr 10 2020 High pressure will build in with cooler and drier conditions through early Saturday.
836 PM PDT Thu Apr 9 2020 Latest satellite imagery shows hardly a cloud in the sky over Washington and Oregon, with high pressure the dominant weather feature. High pressure will remain over the region through the TAF period and VFR conditions will prevail.
1040 PM CDT Thu Apr 9 2020 (Today and tonight) The cold front that passed through our area is currently south of the Red River, though overnight temperatures have been slow to cool. Cooler temperatures, in the 50's, have settled into portions of northern and western OK.
247 AM MDT Fri Apr 10 2020 Warm temperatures today across NE Montana will mean precipitation is set to begin as rain in most places as the next cold front arrives and pushes through the area. The highest totals will occur over higher terrain where locally heavier amounts are possible.
500 mb short wave will move east-southeast thru central Manitoba tonight and a surface cold front will move southeast across the area. Cooler and breezy day on Saturday but it now looks dry. Strong troughing over the central US develops this weekend drawing south unseasonably cold temperatures aloft over the Northern Plains. This deepening trough will develop a potent system out of the Central Plains and into the Great Lakes region, although the majority of forcing and precipitation misses our area well to the south and east.
228 AM MDT Fri Apr 10 2020 Northern stream influence will grow in the period as a massive western NOAM ridge supports anomalously cold long trajectory longitudinal flow in center NOAM. Primary cold front will advance into the region tonight, with falling temps into Sat. However, as the SW CONUS upper trough begins to shift east and phase, lift will increase across the region, maximizing Sat evening locally as the upper jet left exit region times over the FA, supporting a strong FGEN band given expected steep ll lapse rates which happen to be centered in the DGZ.
A backdoor cold front will drop south across eastern Montana and will be signaled by a wind switch to the north and an increase in clouds.
High pressure aloft breaks down through Friday, allowing a weak impulse to brush the northern portion of the region by early Saturday.
1233 AM CDT Fri Apr 10 2020 Today's forecast concerns focus on temperatures, as they will be jumping up and down over the next 4 days, with Freezing warning needed at times and some precipitable weather over the weekend. However, this will also result in good radiational cooling overnight, which will allow widespread sub- freezing temperatures by Friday morning.
313 AM EDT Fri Apr 10 2020 Dry and chilly through tonight as high pressure passes through the western Ohio valley. Highs this afternoon will range in the low to mid 40s while lows tonight fall back into the low to mid.
108 AM EDT Fri Apr 10 2020 Dry and chilly through tonight as high pressure passes through the western Ohio valley. Highs this afternoon will range in the low to mid 40s while lows tonight fall back into the low to mid.
/Issued 915 PM CDT Thu Apr 9 2020/ Current forecast in good shape this evening as cool high pressure at the surface continues to settle southward towards the forecast area.
348 AM CDT Fri Apr 10 2020 A chilly morning with high pressure overhead, but moving southeast allowing for return flow to become better established today, though the stronger gradient is to the south so just a light south/southeast breeze. We will see the leading edge of precipitation with this feature move into the CWA, while at the same time a cold front drops across the Dakotas. This will result in late afternoon temperatures falling near the freezing mark.
Temperatures today will range from 15 to 20 degrees lower than yesterday in the wake of a cold frontal passage. South California mid/upper low will eject eastward and across the southern Plains moving through the weekend.
Much cooler air will advect into the CWA tonight with overnight lows generally in the 30s and 40s. /issued 304 PM CDT Thu Apr 9 2020/ Drier and cooler weather will prevail through the end of the week.
A few of the high- resolution models develop showers again early this morning that could potentially affect northwest Oklahoma, so will include a slight chance of precipitation early this morning in the northwest.
453 AM MDT Fri Apr 10 2020 Northern stream influence will grow in the period as a massive western NOAM ridge supports anomalously cold long trajectory longitudinal flow in center NOAM. Primary cold front will advance into the region tonight, with falling temps into Sat. However, as the SW CONUS upper trough begins to shift east and phase, lift will increase across the region, maximizing Sat evening locally as the upper jet left exit region times over the FA, supporting a strong FGEN band given expected steep ll lapse rates which happen to be centered in the DGZ.
Near to sub freezing temperatures tonight will threaten sensitive, early season vegetation in the Lower Susquehanna Valley.
A chilly morning with high pressure overhead, but moving southeast allowing for return flow to become better established today, though the stronger gradient is to the south so just a light south/southeast breeze. We will see the leading edge of precipitation with this feature move into the CWA, while at the same time a cold front drops across the Dakotas. This will result in late afternoon temperatures falling near the freezing mark.
Despite the spring-like conditions today, expect a chilly night tonight with overnight lows falling into the low to mid 30s, especially across the plateau.
349 AM MDT Fri Apr 10 2020 A high pressure will build into the area Friday into early Saturday.
Surface analysis this morning places a cold front from Southern Georgia into the Northern Gulf of Mexico then back into Southern Texas. Meanwhile, a ridge of high pressure centered over Eastern Nebraska is bringing rain free weather to the Mid- South early this morning. North winds still remain gusty early this morning with temperatures as of 3 AM CDT in the lower to middle 50s over North Mississippi and 40s elsewhere.
402 AM MDT Fri Apr 10 2020 Nearly zonal flow aloft will be over the area today, as a sfc lee trough, is over ern CO. An upper trough moves into the northern & central Rockies and Northern & Central Great Plains Saturday night. This brings a significant cold front across the CWA Saturday evening/night.
As the center of the high nears the CWA this morning. light winds and clear skies could allow for areas of frost to develop over parts of Northeast Oklahoma into far Northwest Arkansas as temps cool close to the freezing mark. afternoon temps are forecast to be slightly cooler with highs in the 60s for most locations. The main focus for this forecast continues to be the cut off upper low. The upper low is progged to begin shifting eastward tonight into the Desert Southwest Saturday as a longwave trof axis drops southeast out of Canada. These winds will begin to transport low level moisture back into the region ahead of the upper low.
N to NNE winds picking up in the wake of the low, around 8-10 kts this morning. Temperatures today will range from 15 to 20 degrees lower than yesterday in the wake of a cold frontal passage. South California mid/upper low will eject eastward and across the southern Plains moving through the weekend.
407 AM CDT Fri Apr 10 2020 High pressure over the Mid-Mississippi valley will drift east today, helping to keep conditions dry and cool across our area.
347 AM PDT Fri Apr 10 2020 Low pressure system over southern California is producing light precipitation in the mountains and desert of Kern County today and this evening.
For today, a mild day is on tap with temperatures near to above average as aforementioned ridge zips on through. Around mid-day a cold front will start to work over northwestern portions of the area, sliding across through the afternoon. For tonight, an upper level low starts to close off over northern Manitoba while a potent short wave rotates down into the Pacific Northwest. VFR conditions will prevail through today, with a little light rain possible as a cold front moves through later today.
621 AM CDT Fri Apr 10 2020 A strong warmup today ahead of an arctic cold front moving into Montana and North Dakota.
For today, a mild day is on tap with temperatures near to above average as aforementioned ridge zips on through. Around mid-day a cold front will start to work over northwestern portions of the area, sliding across through the afternoon. For tonight, an upper level low starts to close off over northern Manitoba while a potent short wave rotates down into the Pacific Northwest. High pressure exiting the region tonight will maintain VFR conditions through Friday morning. A cold front will move into the state from Canada and bring a chance for rain showers to western North Dakota by late afternoon Friday.
Water vapor imagery depicts a split flow pattern with a large closed low over southern California and another deepening low over New England.
302 AM PDT Fri Apr 10 2020 High pressure will build in from the north this weekend with drier and warmer conditions expected.
Another minor adjustment was to increase wind speed and gusts along the cold front moving down from Canada this evening and tonight. For today, a mild day is on tap with temperatures near to above average as aforementioned ridge zips on through. Around mid-day a cold front will start to work over northwestern portions of the area, sliding across through the afternoon. For tonight, an upper level low starts to close off over northern Manitoba while a potent short wave rotates down into the Pacific Northwest. VFR conditions will prevail through today, with a little light rain possible as a cold front moves through later today.
A weather system will bring cooler temperatures and a chance of showers late tonight through Saturday.
533 AM CDT Fri Apr 10 2020 Temperatures are slowly creeping down towards the freezing mark during the predawn hours as winds continue to relax. Highs on Saturday should be warmer despite the showers and cloud cover. Most locations should still warm into the lower to perhaps middle 60s as a low-level warm advection regime increases.
Today and Saturday will be dry and mild across northern and central Nevada as a weakening low pressure system tracks from southern California into Arizona.
620 AM EDT Fri Apr 10 2020 Dry and chilly through tonight as high pressure passes through the western Ohio valley. Highs this afternoon will range in the low to mid 40s while lows tonight fall back into the low to mid.
High pressure will build into the area through early Saturday.
135 PM PDT Fri Apr 10 2020 High pressure will build in from the north this weekend with drier and warmer conditions expected.
The evolution of convection from late Saturday through Saturday night is more uncertain, however the favored zone of lift will be along and north of the developing warm frontal zone likely along or just south of the Red River valley.