Aikyam-Lab/Synoptic-Bench huggingface dataset:
Cold start to the morning with single digit lows in mountain valleys to mid-20s in the lower valleys. An upper ridge building over the region will bring increasing high clouds from west to east through the day and have made a minor update as the cloud shield is progressing quickly east this morning. A high pressure ridge will transition through the region today, providing SE Oregon and SW Idaho with clear skies. The ridge will shift east tonight and replaced by southwest flow aloft on Wednesday as the next trough approaches the Pacific Northwest. Clouds will increase with the approaching trough, along with a slight chance of afternoon rain and snow in Harney County. Highs on Wednesday will be several degrees warmer - close to normal.
High pressure sliding southward through the northern Plains tonight into Wednesday will bring quiet weather to the area. For a time this morning, low level flow is north to northeast increasing fetch across warmer Lake MI waters. Despite Delta-T values around 15 degrees, low levels remain dry, and the low level winds begin to back to the north to northwest this afternoon. Moderate inversion sets up tonight under clear skies, so lowering overnight low temperatures several degrees below main guidance, into the low to mid 20s.
On visible satellite, starting to see a few breaks in the low clouds in our far northern counties, with mainly broken mid level clouds north of our region. This area of high pressure will slowly slide southeast with time. As this occurs, much drier air will filter down into the area along with cooler temperatures. Therefore, we should see clouds continue to decrease from north to south across the region as northeast winds keep temperatures in the lower 50s.
Cold front gradually approaching Southeast Texas from the north. /ISSUED Issued by National Weather Service CORPUS CHRISTI TX/ Latest obs indicate cold front sinking toward northern portions of the forecast area late this morning. Would expect the progression of the front to slow a bit, but still should reach around College Station to Trinity by mid afternoon, keeping temperatures there and north a bit cooler than recent days. A cold front will edge into our area from the north this afternoon and work its way toward the coast and into the Gulf waters tonight through tomorrow morning. Cooler temperatures behind the front are expected to keep CLL from reaching records highs this afternoon.
Tonight, quiet and dry conditions will be seen across the area as high pressure slowly moves through Iowa. The quiet and dry conditions will continue on Wednesday as high pressure slowly moves toward the Great Lakes. A dry cold front will move through the state Wednesday night bringing another round of cold temperatures to the area.
1230 PM EST Tue Nov 7 2017 Aviation High pressure will bring fair and cold weather this week, but there will be a couple chances for some snow showers.
At 500mb a closed low over Hudson Bay with cooler air from the the northern plains through the Great Lakes and Northeast CONUS. A trough extends southwest from the Great Lakes across Nebraska into the Great Basin. Ridge centered over central Mexico with mainly a zonal pattern across the southern CONUS.
103 PM EST Tue Nov 7 2017 A cold front near the north part of the forecast area will sink southward and through the area tonight.
1143 AM EST Tue Nov 7 2017 Issued 1225 AM EST Tue Nov 7 2017 High pressure will build into the Great Lakes for most of this week but temperatures will be cool with highs mainly in the 40s and lows in the upper 20s to lower 30s.
141 PM MST Tue Nov 7 2017 Deep westerly flow is in place in the mid and upper levels across the Central High Plains, with a positively tilted trough extending from the Great Lakes to the Great Basin. This afternoon-Tonight: The mid/upper level trough over the Great Basin is expected to move southeast overnight (some timing differences in models).
Cloud cover looks to continue during the day tomorrow, with the cooler temps behind the front only allowing high temperatures to reach the mid 50s west of the Plateau.
304 PM CST Tue Nov 7 2017 Mid afternoon surface map shows 1033 mb high pressure over se SD while 1012 mb low pressure was in western VA. A weak short wave will exit southeast IL during this evening, while a stronger elongated short wave trof drops southward over northern and central IL during tonight. Brisk ne winds this afternoon will diminish after sunset and allow for a cooler night tonight. Lows to reach the upper 20s nw of I-55 and mid 30s in southeast IL, with subfreezing temps getting near or just south of I-72. High pressure over the northern plains to settle into central/nw IL by Wed afternoon and bring more sunshine and light winds but chilly temperatures.
Surface analysis has a high pressure system across the Dakotas this afternoon. The winds will become light and variable as the high moves in. There is some warm advection and temperatures will be warmer for Wednesday.
346 PM CST Tue Nov 7 2017 (Tonight and Wednesday) Expect a wet and much cooler pattern during the next 24 hours. Could have a window for patchy fog to develop across the area south of I- 20 to a Mertzon-San Angelo-Brownwood line overnight, given an expected combination of clearing skies, recent rainfall and residual high moisture in the lower levels.
Satellite pictures this afternoon show circulation around an upper low pressure area over Arizona, starting to pull moisture into Colorado from the south.
Expect this area of clouds to expand some today as an upper low around the Cal/Az border begins to drift northeast today through tonight. A few light showers not out of the question over the southern mtns today but the main shot of pcpn will hold off until later tonight as the upper low reaches the southern Utah area.
Expect dry conditions with lows in the lower/mid 40s tonight and highs on Wed ranging from the lower 60s in eastern CO to lower 70s in western KS.
409 AM EDT Wed Sep 27 2017 High pressure has continued to assert its control throughout the overnight, with mostly clear conditions, calm winds, and lingering moisture leading to the perfect set up for valley fog development. The overarching high pressure ridge aloft is expected to break down some today as an upper level low moves eastward across Ontario and into Quebec this afternoon. At the surface, an area of low pressure will also be moving eastward across Quebec, dragging a long cold front with it. This cold front will traverse eastern Kentucky this afternoon and evening, before exiting SE of the state overnight. Behind this cold front, winds will become more northerly, on the eastward side of a broad area of high pressure located over the central Plains.
A cold front will move through central Indiana Wednesday, ending the hot conditions and bringing in more seasonable temperatures to end the week.
23z sfc analysis shows the stagnant pattern of weak high pressure through eastern Kentucky still holding. Like the last few nights we will see a ridge to valley temperature split develop along with valley fog. Temperatures are currently in the low to mid 70s most places with dewpoints in the mid and upper 60s while the winds are light and variable. This is apparent even this afternoon as increased gradient is seen over the east coast with Maria passing by and also over the west with the next trough approaching. The next mentioned front will approach the area by Wednesday afternoon but with high pressure holding , this feature will begin to dry and shear out with only a few sprinkles expected.
Subjective 00Z upper- air analysis indicates an upper-level trough from near the ON-MB border toward the Dakotas-MN border, with a second low center near the CA-AZ border and broad troughing in between.
318 AM CDT Wed Sep 27 2017 An upper low was INVOF wrn AZ with a plume of deep rich theta-e air with PWs of +1 to +2 standard deviations in the sw flow aloft e of said low. Today most of the CWFA will be just on the back side of the theta-e ridge axis, exception will be the far reaches of the Lower Trans Pecos/Big Bend Region.
The cold front has dropped into Oklahoma and the upper short wave has split into two with a northern wave tracking across Minnesota and the southern wave becoming cut off over Las Vegas. The wind will become light tonight so that with mostly clear skies and a drier airmass in place we should fall into the lower to mid 40s. This will be a very pleasant day with mostly clear skies, light winds, and highs in the lower 70s.
However, a cold front will push through the area late this afternoon through evening with clouds and perhaps a few showers. This front will usher in much cooler air which will persist through the weekend.
Surface dewpoints have dropped into the lower to middle 60s this afternoon with some fair weather cumulus.
638 AM EDT Wed Sep 27 2017 A few showers, mainly west, with a cold front Wednesday/Wednesday night.
346 AM EDT Wed Sep 27 2017 Today will be another warm day with temperatures well above average as high pressure persists across the southeast. High temperatures will warm to near 90 or into the lower 90s for most locations which is several degrees above normal temperatures for late September.
A few thunderstorms are possible over southeastern parts of central Indiana this afternoon, behind an exiting cold front.
353 AM CDT Wed Sep 27 2017 (Today and Tonight) A closed upper low will remain over the Desert Southwest through tonight, with periodic weak disturbances lifting north across the area in the flow aloft. The weak cold front that moved through the area yesterday is now just south of Interstate 10 and is expected to remain nearly stationary across this area today, then drift a little farther south overnight.
334 AM EDT Wed Sep 27 2017 A cold front will move across the area today.
On Wednesday, like the last couple of days, the highest rain chances will be west. /issued 249 PM CDT Tue Sep 26 2017/ SHORT TERM (Tonight through Wednesday Night): Broad high pressure will remain over the area while a new air mass pushes south across the plains and into central Texas Wednesday night. Ridging will build over east Texas and the northwest Gulf, however, providing more stability locally, though ample Gulf moisture feeding into the area from the south will provide fuel for unsettled conditions.
340 AM CDT Wed Sep 27 2017 The cold front has recently passed se of Lawrence county with nw winds starting to usher in cooler and drier air especially over nw CWA where Galesburg temperature was down to 60F and dewpoints in mid 50s. NW winds 10-15 mph and gusts to 20 mph will bring in cooler air, ending our week long heat wave with highs 90-95F. Highs today range from lower 70s nw of the IL river, to the lower 80s in southeast IL from I-70 se. Much cooler lows tonight ranging from mid 40s by Galesburg to lower 50s in southeast IL. 1027 mb high pressure over the northern Rockies and ridging se into the central Plains, will ridge into central IL tonight bringing the fair and cooler weather.
Water vapor imagery showing very well a jet streak diving very quickly southward through Nevada and California on the backside of an upper level trough while downstream from the trough a jet streak extends from New Mexico northeastward to the upper midwest. The western jet streak continues to dig the trough southward while also beginning to close the circulation. The closed low will remain nearly stationary through Wednesday when the Plains jet streak begins to shift eastward into the Great Lakes and Northeast at which time the western low will begin to eject northward toward the northern Rockies as its downstream path will be blocked by short wave ridging.
240 AM CDT Wed Sep 27 2017 A surface cold front is currently located south of the area early this morning. Highs today will be cooler with highs generally in the upper 60s to the lower 70s as clouds and a cooler air mass will be over the region. Highs in the lower to middle 70s and lows in the 50s can be expected each day this week into the weekend. An upper level low will then move into the northwestern U.
256 AM CDT Wed Sep 27 2017 High pressure is quickly building into the area behind the cold front that pushed through yesterday. This will be evident as winds shift from the N to the NE as the center of the High moves over eastern Nebraska. Cooler air will settle into the region with some high and mid clouds in the afternoon limiting our heating for Wednesday putting high temperatures in the low 70s.
/Wednesday night through Tuesday/ The 500 mb trough crossing our region today will leave behind a closed low over the southwest U.
306 AM CDT Wed Sep 27 2017 Today and Tonight A cold front will remain north of the area, keeping the region under high pressure.
A dry NW flow aloft will prevail today across Montana as an upper ridge builds into the area. This will bring warmer temperature into the forecast area today with clear to partly cloudy skies.
Anomalous moisture will remain over the area within a band of southwesterly flow aloft ahead of Southwest closed low.
The high has been couping with low pressure centered near the AZ/Mexican border to induce a massive expanse of isentropic ascent from the Southern Plains into Southern KS. The light rain will continue to spread NE across extreme South-Central KS but a deepening dry layer induced by the increasing influence of the large high pressure area should keep rainfall amounts in check. Tonight-Fri Night: Strong mid-upper level high pressure that'll be centered over OK for most of these periods & from which a strong ridge of Mt. A STRONG mid-upper cyclone will punch SE across Western Canada Sat & Sat Night. As the cyclone surges SE, then E, close to the U.
A cold front currently extends from northwest Ohio through southeast Missouri and into central Texas. The cold front will move through the remainder of the forecast area tonight with little if any thunderstorm activity expected.
In the meantime, ample boundary layer moisture and light winds under this ridge will support fog to form during the pre dawn hours.
/26/ Today and Tonight: Mid level ridge will remain anchored across the forecast area through tonight.
401 AM CDT Wed Sep 27 2017 Water vapor loop indicated an upper level low pressure system over Ontario. Upper low will continue to move northeast away from the area. Upper level ridge over western Canada will roll over the area Fri night.
Expect dry conditions with lows in the lower/mid 40s tonight and highs on Wed ranging from the lower 60s in eastern CO to lower 70s in western KS. the main weather feature/concern will be the amplification of an H5/H7 ridge combined with the movement of an upper low that shifts off the Rockies and across the Plains region. the upper low coming off the Rockies into the Plains region thru the weekend.
530 AM EDT Wed Sep 27 2017 High pressure will give way to a mostly dry cold frontal passage this evening. While 850 mb temperatures will be off about a degree from previous days, a very warm start and southwesterly flow should allow for widespread mid to upper 80s ahead of the cold front. The aforementioned cold front continues to slow its progression a bit in the model solutions. Fries Cooler and drier air will rapidly advance into the area Wednesday night, quickly ending the chance of any remnant rainfall behind the cold front.
318 AM CDT Wed Sep 27 2017 A cold front was partially through the PAH forecast area at 08z, basically near the Ohio River.
313 AM CDT Wed Sep 27 2017 High pressure over the Northern and Central Plains was building eastward into the area early this morning. Temperatures as of 2 am were in the lower and middle 50s. High pressure will continue to build into the area today. Ridge of high pressure gets suppressed southward tonight as a trough of low pressure starts to drop southeast out of Canada into northern MN.
Current surface analysis shows trough stretching through Saskatchewan, with ridge over the central Rockies into the central plains. upper ridge builds into the western United States with quiet weather expected over our area. Quiet weather expected through the week as an upper level ridge builds into the region, bringing dry conditions and a return to seasonal temperatures.
Will see increasing cloudiness across our southern counties in advance of the next approaching trough aloft near the Four Corners. Warmer temperatures across our northern counties as the airmass continues to moderate. Slightly cooler over southern counties due to more cloud cover.
A weak, but deep ridge persists just north of the Greater Antilles, while a rather weak and nondescript flow prevails from the Keys northwest across the eastern Gulf of Mexico, beneath a small and shallow, but vigorous upper-tropospheric cold-core cyclone.
There could be some lingering wrap-around showers associated with the cyclonic flow behind the low, but this activity should be very light in nature. However, if cloud cover does exit the region faster than expected, cooler temperatures will be possible, along with better chances of frost. The high pressure ridge is progged to translate across the region during the daytime hours. Highs Wednesday will return to seasonal averages, with values ranging from the middle to upper 50s east to the lower 60s west.
320 AM EDT Wed Sep 27 2017 A narrow ridge of high pressure will remain centered over the Appalachians today, while Tropical Storm Maria tracks away from the NC coast. Meanwhile, a dry cold front will approach from the northwest, then cross NC late Thu.
/Issued 230 PM CDT Tue Sep 26 2017/ Cold front has moved well south of the Panhandles. An upper level low will move into southwest Arizona by early Wednesday morning.
316 AM EDT Wed Sep 27 2017 High pressure will give way to a mostly dry cold frontal passage this evening. Temperatures are holding up much higher than previous nights tonight as urban heat islands have strengthened substantially relative to said previous nights, dewpoints remain elevated in the mid 60s, and thermal belts in the ridges keep temperatures well into the 70s in the higher terrain even at this hour. While 850 mb temperatures will be off about a degree from previous days, a very warm start and southwesterly flow should allow for widespread mid to upper 80s ahead of the cold front. The aforementioned cold front continues to slow its progression a bit in the model solutions. Fries Cooler and drier air will rapidly advance into the area Wednesday night, quickly ending the chance of any remnant rainfall behind the cold front.
Patchy fog has developed in parts of northwest Iowa and South Dakota, although some high cirrus across northwest Iowa and a small area of mid level clouds over the Highway 14 corridor have helped to limit the fog development thus far. Wednesday will see the upper jet currently centered over Minnesota translate over the Great Lakes through the day as the axis of an upper level trough swings eastward.
240 AM EDT Wed Sep 27 2017 A few showers, mainly west, with a cold front Wednesday/Wednesday night.
Rainfall rates have been less than impressive across the Rolling Plains early this morning as a thinning warm conveyor belt associated with an upper low departing through Ontario was shifting to the east of the CWA. Additionally, the deformation and diffluence associated with an upper low across the Desert Southwest will be far enough west to keep the primary lift over the Four Corners states.
306 AM EDT Wed Sep 27 2017 A cold front will approach from the west today and will cross the region tonight.
At the surface, high pressure will slowly move across the state. Tonight as the high continues to shift east, winds will switch a round to the south or southwest but will be very light.
Weather maps this morning shows a short wave mid-level ridge extending from the western Gulf to up across the Tennessee River Valley. High level trof axis has shifted southeast, positioned from the Florida Peninsula to the eastern Gulf.
258 AM MDT Wed Sep 27 2017 Current surface map shows high pressure across Wyoming into South Dakota.
201 AM EDT Wed Sep 27 2017 High pressure and dry conditions will be in place through tonight. A cold front will move through on Wednesday bringing the chance for showers and a transition to cooler temperatures. A cold front will move through on Wednesday. Cooler air will filter into the area allowing for temperatures to drop down into the 50s Wednesday night. Summary - High confidence in a cooler airmass than recent weeks that will be largely dry with no impact weather.
The latest upper air analysis shows the closed low over the Desert Southwest continuing to deepen. East of the low atmospheric moisture was continuing to stream northeast over the middle of the CONUS. At the surface a high pressure was over the Central High Plains.
Kept highs in the lower 70s with plenty of sun expected and lows tonight in the 40s.
Tuesday evening's subjective surface and upper-air analyses showed a weakening surface cold front from Michigan through central TX, and a deep-layer ridge across much of the eastern CONUS. However, this ridge was weaker than 24 hours ago, and there was a fairly potent short wave trough at 500 mb beginning to crash through the upper ridge over the Great Lakes. High temperatures will be in the lower 90s, which continues to be about 5 F or so above average for this time of year.
315 AM EDT Wed Sep 27 2017 Cold front slowly sliding through southeast Michigan this morning with little fanfare (isolated light showers), but steady northwest winds today will lead to drier and cooler conditions.
304 AM CDT Wed Sep 27 2017 Surface cold front, currently across southeast Oklahoma from McAlester to Idabel, will move south across the ArkLaTex today. Additionally, could see scattered afternoon showers and thunderstorms across central Louisiana and deep East Texas due to convergence ahead of cold front and possible weak seabreeze southerly flow interaction. Winds to become northeast behind the front with cooler airmass to advect south across the region over the next couple of days.
Latest water vapor imagery showed an upper level closed low over the CA/AZ border, elsewhere a modest short wave ridge was over the Central Rockies. Over the next 12 hours, modest 500 hPa height rises will occur overhead as the aforementioned short wave ridge progresses northeastward into the Central High Plains. Meanwhile, the upper level closed low will only see little movement to the northeast today before eventually lifting into the Central Great Basin overnight. Otherwise, highs are expected to be roughly 3-6 degrees warmer today than yesterday. An upper level low will slowly lift northeast from the desert southwest into our area by the end of the week.
Current surface analysis reveals very calm and tranquil weather in the lower Ohio Valley, while Hurricane Maria spins off the North Carolina coast to the east, and a strong cold front advancing toward our region looms off to the west. The cold front currently in the Midwest should move through our CWA early Wednesday morning at the surface as winds switch to the north and northwest, but another warm and muggy day will be in store Wednesday as the bulk of the colder/drier air lags behind. Low level lapse rates will steepen some behind the cold front and result in "popcorn" convection developing Wednesday afternoon, though warm air in the mid levels will keep instability in check and keep showers/storms relatively weak.
306 AM EDT Wed Sep 27 2017 A few showers, mainly west, with a cold front Wednesday/Wednesday night.
300 AM CDT Wed Sep 27 2017 Today and Tonight: Mid level ridge will remain anchored across the forecast area through tonight.