Aikyam-Lab/Synoptic-Bench huggingface dataset:
924 PM EDT Tue Jun 20 2017 A drier and cooler air mass will move into the area tonight. Another weak trough will move across the area Wednesday and will be accompanied by scattered showers and maybe a few thunderstorms across central and northern areas.
Drier conditions are then expected later tonight into Wednesday as zonal flow aloft continues and broad mid- to upper-level troughing becomes established over much of western and central Canada, and the adjacent northern tier states, including Montana.
Most areas will also be a touch cooler Wednesday, but perhaps more notably will be the lowering of dew points and afternoon humidity across the area. winds will shift slightly offshore as the thermal trough along the coast strengthens. A thermal trough along the coast will continue strengthening this evening, and persist for several days, causing steep, wind driven seas. An upper level trough tracking across western Canada has weakened the ridging over the region.
Little change in the overall weather pattern with a squeeze play between the Atlantic ridge to our east and Tropical Storm Cindy to our west.
849 PM MDT Tue Jun 20 2017 Isolated evening thunderstorms continue to spread off the higher terrain and onto the adjacent plains. Not much change in moisture and instability either, with precipitable water values around three-quarters of an inch over the lower elevations and less over the higher terrain. The storm bases will be high, so chances at measurable precipitation will be low, especially across the lower elevations. A few lingering thunderstorms may be moving slowly off the higher terrain Wednesday night, with gusty winds and light rain.
1135 PM EDT Tue Jun 20 2017 Weak high pressure will slide south of the Commonwealth through Wednesday afternoon. A deep upper level trough will approach the region later this week and draw a plume of deep tropical moisture north from the Gulf Coast region.
754 PM EDT Tue Jun 20 2017 A weak cold front will cross southeast through the area tonight, wash out between the I-70 corridor and the Ohio River on Wednesday, and lift northeast of the region Wednesday night.
Weak cold air advection behind this trough is resulting in cooler temperatures across northern Iowa. The warm air advection aloft associated with the leading flank of this ridge should be sufficient to generate additional showers and thunderstorms across western Iowa and states to our north and west late tonight into Wednesday morning, mainly across northern Iowa, with a low severe weather threat. The triple-point and trailing trough should serve as foci for convective initiation late in the day Wednesday, but there is uncertainty as to the location and timing of this initiation, and its resulting eastward evolution, dependent on the amount of convective overturning/contamination earlier in the day from the aforementioned morning showers/storms.
Not much change in moisture and instability either, with precipitable water values around three-quarters of an inch over the lower elevations and less over the higher terrain. The storm bases will be high, so chances at measurable precipitation will be low, especially across the lower elevations. A few lingering thunderstorms may be moving slowly off the higher terrain Wednesday night, with gusty winds and light rain.
953 PM EDT Tue Jun 20 2017 A weak cold front will cross southeast through the area tonight, wash out between the I-70 corridor and the Ohio River on Wednesday, and lift northeast of the region Wednesday night.
Upper level high pressure in place and air mass will not change much.
720 PM EDT Tue Jun 20 2017 High pressure will build across our area Wednesday providing fair weather.
Dew points have dropped into the upper 50s and lower 60s across much of the area, helping to make it feel a little cooler and drier on this Summer Solstice. Chattanooga Airport, TN 68 85 70 82 / 10 20 30 70 Knoxville McGhee Tyson Airport, TN 66 85 68 82 / 10 10 10 50 Oak Ridge, TN 65 87 68 82 / 10 10 10 50 Tri Cities Airport, TN 61 84 64 81 / 10 10 10 40.
/issued 422 PM CDT Tue Jun 20 2017/ For the first few days, the upper level high off to our west will remain entrenched. The currently progged track of the system is expected to have little impact on our weather as we already are under the influence of a respectable high pressure system. As mentioned in the overnight discussion, the higher dewpoints expected later this week would tend to keep highs in check.
The axis of the Atlantic high pressure ridge axis will remain over the Atlantic extending westward into SE GA and NE FL through mid week as a developing tropical system over the central Gulf of Mexico moves toward Louisiana and the far upper Texas coast.
1216 AM EDT Wed Jun 21 2017 A drier and cooler air mass will move into the area overnight. Another weak trough will cross the area Wednesday accompanied by scattered showers, and maybe a few thunderstorms across central and northern areas.
Gilchrist Previous discussion: A Lee-trough over central Montana this afternoon extends north into Alberta. A cold front will slice southeast through the area early Wednesday and combined with strong CAA, will increase winds quickly across the area.
A series of weak cold frontal surges will move south each day through the week cooling temperatures and bringing more north to northeast winds.
1223 AM EDT Wed Jun 21 2017 A cold front will push east of the region tonight as a weather disturbance lifts north across the area. Low pressure will lift north through Quebec tonight and Wednesday.
A trough extends along the eastern edge of the storm, stretching from New England to the Yucatan Peninsula. As the storm moves away from the Keys, the subtropical ridge will build in and across the Florida Peninsula. The gradient between the high pressure to the east, and the storm over the northern Gulf of Mexico, will result in moderate to fresh winds again overnight.
Temperatures will be similar to today, with highs reaching the low 80s. Cloud cover will also increase across the region overnight, and low temperatures will be warmer, staying in the 60s.
A few models have hinted at some low stratus or patchy fog to develop/move up this weak trough axis overnight, and surface humidity values will approach 95-100% by sunrise, so cannot completely rule out shallow patchy fog or scattered stratus by daybreak. With mostly clear skies, light winds, and high temperatures in the upper 50s to the lower 60s, Saturday will be an excellent candidate for outside yard work or other events before the cold weather arrives mid-week.
Temperatures today have run slightly cooler than expected, likely thanks to the enhanced cloud cover. Saturday, highs will again be mild, running around 10 degrees warmer than average.
Aloft, zonal flow continues east of the Rockies, with an embedded short wave trough moving into the Plains. The Plains short wave trough will make its way east tonight, affecting the Tennessee and Ohio Valley regions late tonight into Saturday. Have allowed for low to mid 30s further south, given the higher dew points in place and a quicker potential onset of clouds. Lows Saturday night will range from the low to mid 30s in the northwest, to the mid to upper 30s in the southeast under partly cloudy to mostly clear skies.
656 PM EST Fri Dec 1 2017 High pressure will reside over the northeast this weekend bringing partly cloudy skies and mild temperatures. The rest of these low clouds will lift out through early evening with mainly clear skies expected through later tonight as high pressure builds over the area. High pressure will move to the eastern seaboard by afternoon resulting in a moderating southerly flow. High temperatures will range in the lower to middle 40s under mostly cloudy skies. High pressure maintains quiet weather for this part of the forecast.
900 PM EST Fri Dec 1 2017 High pressure will reside over the northeast this weekend bringing partly cloudy skies and mild temperatures. Upped clouds some for the high broken clouds moving in from the west. The rest of these low clouds will lift out through early evening with mainly clear skies expected through later tonight as high pressure builds over the area. High pressure will move to the eastern seaboard by afternoon resulting in a moderating southerly flow. High temperatures will range in the lower to middle 40s under mostly cloudy skies. High pressure maintains quiet weather for this part of the forecast.
An upper trough over the NE Pacific Ocean near 50N and about 136W will dig southeastward into the PacNW this weekend. Rainfall will be light to moderate across the area with the highest amounts of 1.
At the surface, high pressure sits over southwestern SD. Zonal flow will become more ridge-like this weekend as a trough pushes into the Pacific Northwest.
/issued 334 PM EST Fri Dec 1 2017/ Fairly persistent pattern for the next several days, as high pressure is in place to the north. The change in the pattern will come from an approaching front, which will be be in association with a strong 500mb trough. This trough will dig from well to the north in Canada, down to the Florida peninsula by the latter half of the week.
This is near the cooler edge of the 18 UTC global and statistical forecast envelope as temperatures have been quick to fall with good radiational cooling.
/ISSUED 332 PM CST Fri Dec 1 2017/ At 2 PM, high pressure over the eastern U. continues to retreat east and an area of low pressure was nearly stationary over the Texas panhandle. High cloudiness will increase Saturday night and a weak warm front will slowly approach the coast.
531 PM CST Fri Dec 1 2017 Tonight through Saturday: High pressure will track from northwestern Nebraska into western Kansas overnight. On Saturday, high pressure will build east into northeastern Kansas and southeastern Nebraska. Southerly winds will develop on the back side of the high, ushering in slightly warmer air to the forecast area compared to today.
This southerly flow was ahead of a weak trough in the plains that will push through the region early Saturday. The anticipated transition to a more high amplitude, blocking pattern featuring an upper level trough over the central U.
An upper-level composite analysis this evening reveals a deep layer mean anticyclone centered over southern Mexico with large-scale anticyclonic flow covering most of the Gulf basin, including the Florida Keys. Near-surface equivalent potential temperature values are a little higher over the warmer waters of the Gulf Stream, which is where most of the low-topped rain showers have been developing for the last several hours.
Light winds were observed in the lowest levels with primarily west-northwest flow throughout the profile above 900 mb. /issued 346 PM CST Fri Dec 1 2017/ High pressure will control the area's weather for the next several days.
757 PM EST Fri Dec 1 2017 The axis of a low/mid level high pressure is stretched across the peninsula this evening as a stalled front remains draped across the Florida Panhandle.
648 PM EST Fri Dec 1 2017 A weak cold front will stall just south of the area tonight.
/issued 411 PM CST Fri Dec 1 2017/ Under sunny skies today temps climbed into the low to mid 70s acrs the region. high pressure will exit off to the northeast with light southerly winds becoming established late in the day.
817 PM EST Fri Dec 1 2017 High pressure will build across the region tonight and Saturday.
522 PM CST Fri Dec 1 2017 High pressure will dominate the forecast through the weekend. As the center of the high moves toward the upper east coast winds will become more southerly allowing temps to rise a couple degrees each day. A 700mb trough will sweep across the region overnight and bring more mid to upper clouds as indicated in time-height cross section moisture analysts. The passage of the trough on Saturday will lend to lesser cloud cover/partly to mostly sunny skies especially by afternoon.
The cold front has entered northwest Oklahoma this evening and is slightly faster than the previous forecast. Some fog is still possible immediately ahead of the cold front, where there is some moisture pooling. West-central into southwest Oklahoma and western north Texas may have the greatest chance of fog with the higher dew points located in this area.
318 PM MST Fri Dec 1 2017 There is a weak disturbance brushing Northern Colorado this afternoon along with a weak cold front pushing across northeast Colorado as well. Not much cooling with this as temperatures still into the lower 60s. Just enough moisture in the mountains for a few snow showers over the high mountain passes this afternoon. Will still see a fair amount of wind over the higher mountains on Saturday with gusts in the 30-50 mph range.
An upper low is spinning west of the Baja California coast. if the high clouds persist it might inhibit the low clouds.
411 PM CST Fri Dec 1 2017 Under sunny skies today temps climbed into the low to mid 70s acrs the region. high pressure will exit off to the northeast with light southerly winds becoming established late in the day.
Weak ridging still in place over the area with seabreeze that made it past IAH. /ISSUED 332 PM CST Fri Dec 1 2017/ At 2 PM, high pressure over the eastern U. continues to retreat east and an area of low pressure was nearly stationary over the Texas panhandle. High cloudiness will increase Saturday night and a weak warm front will slowly approach the coast.
High pressure will be firmly across the area for the next couple of days. Even with a cold front moving through yesterday.
547 PM CST Fri Dec 1 2017 Mid level clouds will be on the increase overnight as a weak trough swings through northern Wisconsin. With southerly flow in place, temperatures should remain on the mild side in the low 30s.
Chattanooga Airport, TN 47 64 43 64 / 10 0 0 0 Knoxville McGhee Tyson Airport, TN 45 63 42 63 / 10 10 0 0 Oak Ridge, TN 42 63 40 63 / 10 10 0 0 Tri Cities Airport, TN 40 58 38 61 / 10 10 0 0.
630 PM EST Fri Dec 1 2017 High pressure will drift east of the area tonight but should remain in control of our weather Saturday.
506 PM EST Fri Dec 1 2017 High pressure will build across the region tonight and Saturday.
Warm front approaches from the southwest on Saturday as temperatures should warm nicely into the mid 50s with relatively light wind. Warm front will have moved to the northeast Saturday night and most locations should remain above freezing, except for perhaps far north/west.
A south to southeast wind tonight will become slightly more southwesterly Saturday morning ahead of a weak cold front. The resulting increase in dewpoints combined with thickening high clouds will keep temperatures a little warmer tonight, with lows remaining in the 50s.
Saturday looks fantastic with highs a few degrees warmer into the low to mid 60s.
631 PM EST Fri Dec 1 2017 High pressure with foggy mornings through the weekend.
Thicker clouds around for Saturday as the 700 MB thermal trough works through, still plenty dry enough down low not to worry about any precipitation chances.
929 PM EST Fri Dec 1 2017 High pressure will remain in control over the region through the weekend.
Weak high pressure ridge will continue over north Florida and produce light winds down into our northern areas. Onshore flow over the south will be weaker than previous nights, so mins there look a few degrees lower in the lower/mid 60s. Low level winds will be lighter due to the influence of the high pressure ridge.
The front will wash out to our south on Saturday in deference to a deepening lee trough over the High Plains.
An upper low and trough move onto the Pacific northwest coast on Saturday allowing for a southwest flow aloft across our area.
/Tonight through Saturday/ A weak low pressure trough will move across the forecast area overnight, followed quickly by high pressure on Saturday. Satellite imagery depicts a large area of mid/high level clouds surrounding the trough axis upstream and these will move across much of our area tonight, however, a general lack of forcing and moisture preclude precipitation chances at this time. Finally, there is little indication of cold air advection behind the aforementioned trough, and high temperatures tomorrow should be similar to todays levels, or perhaps just a couple degrees cooler.
This next storm system is currently out near 140W and will be driven se as the upstream ridge strengthens rapidly due to a system just west of the dateline. The large amount of warm air going into the upstream ridge should allow this system to dig into the Great Basin with a decent potential of a developing srn low with this trough.
528 PM CST Fri Dec 1 2017 High pressure sitting over the Ohio River valley will move east this evening and bring a return to southerly winds into tomorrow.
Looks like a nice weekend as surface ridging controls much of the eastern United States.
There is a weak disturbance brushing Northern Colorado this afternoon along with a weak cold front pushing across northeast Colorado as well. Not much cooling with this as temperatures still into the lower 60s. Just enough moisture in the mountains for a few snow showers over the high mountain passes this afternoon. Will still see a fair amount of wind over the higher mountains on Saturday with gusts in the 30-50 mph range.
/Issued 218 PM CST Fri Dec 1 2017/ Mid level SW flow continue to advect mid to high clouds northeast into our region ahead of a mid level low pressure system off the Baja California coastline.
Temperatures are in the 70s across the area or about 1-4 degrees warmer than at this time yesterday. Lows will bottom out in the lower 50s across much of the area.
554 PM CST Fri Dec 1 2017 Continued VFR with light SW winds, veering more NW before daybreak ahead of a decaying cold front. /issued 256 PM CST Fri Dec 1 2017/ Winds have shifted to the southwest today as surface lee troughing developed. The downsloping warming component of the wind will allow temperatures to warm quickly this weekend, and highs will be in the low 70s which is about 10 degrees above normal.
901 PM CST Fri Dec 1 2017 A weak upper-level disturbance is approaching the area this evening from the west in the zonal flow regime over the lower 48 states. Meanwhile, at the surface, weak southerly flow is in place across the forecast area on the back side of a departing area of high pressure. These clouds and the southerly low-level flow should keep overnight lows several degrees warmer than last night. High pressure sitting over the Ohio River valley will move east this evening and bring a return to southerly winds into tomorrow.
540 PM CST Fri Dec 1 2017 At 3 PM, a cold front was located over western Minnesota. Temperatures ahead of this cold front ranged from the mid 40s to mid 50s. 5C cooler on Saturday, there will be more sunshine.
This will result in a weak surface trof moving east across central Kansas to along the turnpike corridor by dawn. A modest increase in low level moisture ahead of the trof will occur and may help promote patchy fog where winds become light near the surface boundary early Saturday morning.
1036 PM EST Fri Dec 1 2017 High pressure will build across the region tonight through Saturday, leading to mainly dry weather for the weekend. Fairly tranquil weather is expected for through the end of the week as high pressure gradually crests over the region. A warm front lifting to the west may allow for a few snow showers overnight across northern areas overnight Saturday night. Highs will be in the mid 30s in the mountains and the lower 40s in the wider valleys, while Saturday night's lows will mainly be in the mid 20s to around 30.
Will see increasing mid and high clouds as weak cold front approaches from the northwest and moisture advects in ahead of it.
An upper level trough off the Pacific northwest Coast is sending a weak system into western Washington tonight that will bring some light precipitation to the east slopes of the Washington Cascades. The trough will become better organized on Saturday and send another system into the region Saturday. Surface moisture trapped in the Lower Columbia Basin will persist as fog overnight especially in the Yakima valley where it has become dense.
215 PM PST Fri Dec 1 2017 Mostly clear through Saturday with weak high pressure aloft.
Widespread dense fog development will depend upon the coverage/thickness of the high clouds streaming in from the north. However, if the high clouds remain thin/or very little in coverage, the dense fog will be more widespread and an advisory may be needed. All are showing a backdoor cold front currently over the Carolinas moving into eastern GA.
All are showing a backdoor cold front currently over the Carolinas moving into eastern GA.
20Z water vapor imagery showed zonal flow over the central plains while an upper low remained off the Baja of California coast and an upper trough approached the Pacific Northwest. However the higher dewpoints remain across central TX and the Big Bend of the Rio Grand. For high temps on Saturday, mixing is expected to be limited by weak ridging passing through.
647 PM EST Fri Dec 1 2017 High pressure will build across the region tonight through Saturday, leading to mainly dry weather for the weekend. Fairly tranquil weather is expected for through the end of the week as high pressure gradually crests over the region. A warm front lifting to the west may allow for a few snow showers overnight across northern areas overnight Saturday night. Highs will be in the mid 30s in the mountains and the lower 40s in the wider valleys, while Saturday night's lows will mainly be in the mid 20s to around 30.
As in the previous discussion, upper trough from the Gulf of Alaska will bring moisture into northern areas Saturday and Saturday night and several inches of snow as low as 3000 feet MSL.
932 PM EST Fri Dec 1 2017 High pressure will drift east of the area tonight but should remain in control of our weather Saturday.
A closed upper low will remain over the northern Baja region through tomorrow, resulting in west to southwest upper mid/level flow and some high clouds moving across the area through the period. The increase in low level moisture and some cloud cover will result in warmer temperatures tonight, with lows in the lower 50s. Temperatures will be warm tomorrow, with partly cloudy skies by afternoon, with highs in the lower and middle 70s.
An amplified ridge will persist over the western portion of the country, while a deep active trough will remain over the eastern half.
718 PM EST Tue Dec 5 2017 A strong cold front has brought rain that will continue into the evening.
By Wednesday evening the main trough energy from the eastern wave will have rotated through our region and allowed the subtle influence of the west coast ridge of high pressure to nudge into our region. Through the remainder of the week and into the weekend, northerly flow aloft will prevail and the influence of the high pressure ridge from the west will keep any and all precipitation away from northeast Montana for several days.
Cooler and drier air continues to filter into the region following the cold frontal passage earlier today and temps remain on track to bottom out in the mid and upper 30s to low 40s across most of the area tonight.
Eventually, rain is expected to mix with snow as temperatures drop into the low to mid 30s. Temperatures are expected to remain in the low to mid 30s throughout the day tomorrow south of Interstate 20. (Wednesday night through Tuesday) Forecast soundings across the northern Edwards Plateau and Concho Valley indicate below freezing temperatures throughout the column, except near the surface, where temperatures may hover just above freezing, Wednesday evening. With temperatures near to slightly above freezing, accumulations look to remain light.
918 PM EST Tue Dec 5 2017 Surface cold front continues to push south and east of the region. A surface cold front extends from Ontario all the way down to the Gulf Coast states. This cold front has cleared the lower Ohio Valley region, and temperatures have been steadily falling through the morning and afternoon due to strong CAA behind the front.
Strong high pressure centered to the west of Utah will maintain a stable northerly flow across the Great Basin through the end of the week.