Aikyam-Lab/Synoptic-Bench huggingface dataset:
This system will bring a return to cooler temperatures and showery conditions with a few thunderstorms to much of Utah and southwest Wyoming. Water Vapor loop shows an expansive closed low over the Pacific Northwest and Northern Rockies. Afternoon water vapor and H5 analysis indicate the closed circulation of an upper Low gradually approaching northwestern Utah, with center of circulation oriented along the ID/OR border. The leading edge cold front attendant with an ejecting short wave (lifting NE of the area currently) is now stretching from roughly Green River to Beaver and is becoming more zonally oriented as the upper support lift away. The upper Low will orient over northern Utah by tomorrow morning then gradually shift south during the day.
An upper low over ne Oregon will continue to produce showers over sw Washington and nw Oregon tonight and Monday. The showers will decrease from west to east as the upper low moves further to the e.
The closed low/trough across the Pacific Northwest may bring shower activity close enough to affect Petroleum County at times though that would be the lone exception. Warmer conditions are expected in the coming days. The low pressure to our west will continue pushing up against our ridge of high pressure and will direct plentiful amounts of Pacific Ocean moisture into the Rocky Mountains where most of it will rain out.
602 PM CDT SUN MAY 15 2016 Low amplitude nwrly/zonal upper level flow remains in place across the region today, set up between low pressure over the nern CONUS and weak ridging over the Rockies ahead of another low over the Pac NW. At the surface, winds have switched to the south CWA-wide, with high pressure centered over MO/AR and low pressure over the Rockies. At the surface, winds start turning more southeasterly this evening as low pressure over southeastern CO, likely to be mainly easterly by sunrise tomorrow. With overcast skies and ongoing precipitation, hard to see high temperatures getting out of the lower/mid 50s. Southwesterly flow aloft is expected to be in place across the region Monday night as an upper level low spins across the desert southwest.
/issued / Clouds are increasing from west to east across the forecast area this evening with temperatures ranging from the lower 50s to mid 60s. ARS Despite the cooler temperatures. Deeper low level moisture will begin to surge north tomorrow night with slightly milder lows as a warm front near the Gulf lifts north to near the KY/TN border.
1059 PM EDT SUN MAY 15 2016 An upper low north of Pennsylvania will funnel very cold air into the state tonight with a late season freeze likely in some western and northern higher elevations.
As expected, southwest flow ahead of the low pressure to our northwest allowed moisture to increase overnight and today. The stronger storms have produced some pea to dime sized hail but the bigger concern has been gusty surface winds with the highest report being 52MPH from the Montrose airport. By daybreak Monday, the low pressure will be just entering northern Utah with plenty of moisture still remaining in our CWA. Very similar conditions to Sunday will be in place though lift will be enhanced somewhat as the low gets closer. The low pressure will be slow moving as upper level support will remain to our west and east.
Southwest Montana still under the gun for showers Monday due to circulation around the upper low over southern Idaho.
1132 PM EDT SUN MAY 15 2016 An upper low north of Pennsylvania will funnel very cold air into the state tonight with a late season freeze likely in some western and northern higher elevations.
1249 AM EDT MON MAY 16 2016 High pressure will build over the area through Monday.
909 PM EDT SUN MAY 15 2016 An upper low north of Pennsylvania will funnel very cold air into the state tonight with a late season freeze likely in some western and northern higher elevations.
With a notable upper low presently situated over the CWA, we expect shower activity to last most of the night, although thunderstorms should taper off around midnight. At 2 PM MDT the upper low was centered just north of McCall, ID, with cool, moist air mass throughout our CWA. Locally heavy showers and isolated thunderstorms were rotating around the low. Tonight the upper low will turn south through western Idaho and showers will increase in sern Oregon and swrn Idaho but decrease in nrn-most areas. Showers and isolated thunderstorms will also continue in the central Idaho mountains where swly flow aloft rises over the higher terrain. Showers will decrease from the north Monday night as the low moves further south through Nevada.
1010 PM EDT SUN MAY 15 2016 High pressure will build over the area through Monday.
1129 PM CDT SUN MAY 15 2016 The short term concern is the shower threat dropping south with the cold front overnight into monday. Overnight low temperatures will be 10 to 15 degrees warmer tonight than last night ahead of the front with some cloud cover.
740 PM EDT SUN MAY 15 2016 High pressure across the northern and central Plains will build into the Ohio Valley tonight resulting in clear skies and diminishing winds.
moisture swirling around slow moving upper low pressure area will continue to affect area mainly east of yakima to john day.
1132 PM CDT SUN MAY 15 2016 Water vapor satellite this afternoon shows an upper level low over western Ontario with a short wave trough over the Lake Winnipeg area. The upper level low is expected to stay over extreme southern Ontario as it moves southeast. The short wave trough will move almost straight south tonight before turning to the southeast Monday. The right entrance region of the jet rounding the upper level low looks to be over the area by Monday afternoon to add some additional lift to the short wave trough. there does not look to be much moisture transport back into the area as this is focused farther south on the short wave trough coming out of the southern Rockies.
1100 PM MDT SUN MAY 15 2016 An upper level low pressure storm center over eastern Oregon moving into western Idaho continues to spread Pacific moisture into western and central Wyoming.
819 PM EDT SUN MAY 15 2016 High pressure will be North of the region through the night with passing high cloudiness.
622 PM CDT SUN MAY 15 2016 Quiet night anticipated as high pressure drifts over the region. This evening, winds will become lighter and more variable before more southerly flow sets up after midnight on the other side of the ridge axis.
914 PM EDT SUN MAY 15 2016 Freezing temperatures are expected tonight before temperatures moderate into mid week. With 850mb temperatures expected to range from -2C to -4C, clearing skies and diminishing winds will allow for temperatures to fall to near or below freezing overnight. A freeze warning has been issued for all counties, with lowest temperatures into the mid 20s expected in the ridge counties.
639 PM CDT SUN MAY 15 2016 Water vapor satellite this afternoon shows an upper level low over western Ontario with a short wave trough over the Lake Winnipeg area. The upper level low is expected to stay over extreme southern Ontario as it moves southeast. The short wave trough will move almost straight south tonight before turning to the southeast Monday. The right entrance region of the jet rounding the upper level low looks to be over the area by Monday afternoon to add some additional lift to the short wave trough. there does not look to be much moisture transport back into the area as this is focused farther south on the short wave trough coming out of the southern Rockies.
Chattanooga Airport, TN 46 71 59 81 / 0 10 40 40 Knoxville McGhee Tyson Airport, TN 43 70 56 78 / 0 10 40 50 Oak Ridge, TN 42 72 56 77 / 0 10 40 50 Tri Cities Airport, TN 38 69 52 73 / 0 10 50 60.
719 PM EDT SUN MAY 15 2016 High pressure builds-in overnight.
Lows tonight look to range from the lower 50s north to the upper 50s south. It has been a pretty great weekend weatherwise for mid May thanks to a dry cold front that traversed the region yesterday. This front helped to usher in drier air which then resulted in much cooler temperatures this morning and into this afternoon. After starting the day with lows only in the upper 50s/low 60s, we have only reached into the lower 70s this afternoon. This is around 10 degrees cooler than 24 hours ago and even nearly 15-20 degrees cooler in some locales. Elsewhere, conditions will remain dry but the atmosphere will slowly moisten through tonight into the beginning of the work week as winds swing around from the south during this time period thanks to the stalled frontal boundary moving north as a warm front.
Overnight lows are expected to be in the mid 70s range with dew points in the lower 70s. Weak flow will gradually firm up out of the northeast to east as South Florida cools and a high pressure system over the eastern United States draws slowly nearer the Florida Keys.
High pressure centered just north of the region will slowly drift to the east through 12z Monday. A warm front extending eastward from a low pressure center over the Plains will lay out across MO and KY on Monday, allowing winds to veer around to the east- southeast by Monday midday-afternoon.
222 AM EST Wed Dec 28 2016 High pressure will briefly build across central North Carolina today.
Scaled back on winds a bit from previous forecast for all but the higher terrain of southwest ND which has the better potential to tap into the stronger winds off the surface and also where models show the best pressure rises.
325 AM EST Wed Dec 28 2016 High pressure will briefly build across central North Carolina today.
The high clouds should clear overnight. Winds are light this evening and temperatures for most valley areas have been trending a few degrees warmer. By morning most valley temperatures should end up bottoming out in the lower to mid 30s with patchy frost.
459 AM EST Wed Dec 28 2016 High pressure will move across Pennsylvania today with cooler temperatures.
426 AM EST Wed Dec 28 2016 High pressure will be situated east of the area today.
The lower ceilings will last the longest at the northwest Arkansas sites, but all sites will become VFR by late Wednesday afternoon. Winds will shift to the northwest Wednesday afternoon as a cold front moves across the area.
1230 AM EST Wed Dec 28 2016 A cold front will move across central North Carolina overnight with high pressure building into the area on Wednesday.
235 AM MST Wed Dec 28 2016 Latest upper air analysis shows a long wave trough digging south across the CONUS. At the surface a pre-frontal trough had moved through from the northwest. Behind the trough south winds had turned to the west. This morning a weak cold front will move through from the northwest.
241 AM CST Wed Dec 28 2016 Early this morning, a mid-level trough was noted extending from Manitoba down into the Northern Plains. At the surface, a low is seen just east of the Rockies and is expected to move east across southern Kansas this morning with support from the aforementioned mid-level trough. An associated weak cold front will advance across northeast Kansas mid-morning with no precipitation expected with this passing.
Clouds will linger across the southeast coastal plains more through the day Wednesday as a cold front approaches the region from the Northwest.
301 AM CST Wed Dec 28 2016 A mild and breezy day ahead as a low pressure system over eastern SD moves across southern MN this morning and western WI early this afternoon. A more valid precipitation signal is expected later this morning and through the afternoon as a small band of flurries/ sprinkles/light snow progress across the FA on the back side of the low pressure system. In addition, westerly winds will increase behind the low. Modified the highs using bias corrected EC guidance along with MOSGuidance. It will be a mild night with lows in the lower to middle 20s.
132 AM EST Wed Dec 28 2016 High pressure will move across Pennsylvania Wednesday with cooler temperatures.
1100 PM CST Tue Dec 27 2016 At 3 PM, subsidence in the wake of a departing short wave trough has resulted in clearing across southeast Minnesota and northeast Iowa. Elsewhere the temperatures were in the lower and mid 20s. For tonight, skies will gradually clear across western Wisconsin this evening in the wake of the short wave trough which is moving through the region. In addition to the clouds, we will see moderate to strong warm air advection take place in the lowest 4 km of the column.
1254 AM EST Wed Dec 28 2016 Aviation Tranquil weather will continue tonight through Wednesday night as a weak high pressure ridge builds in.
1200 AM EST Wed Dec 28 2016 Dry weather and seasonal temperature can be expected until the approach of a Wednesday night cold front.
232 AM CST Wed Dec 28 2016 06Z surface data has high pressure from the Ohio Valley into the Great Lakes.
320 AM CST Wed Dec 28 2016 As 1025mb high currently centered over the Ohio River Valley continues to shift off to the east, an increasing southerly flow will bring warmer air into central Illinois today. A cold front analyzed across the Dakotas at 08z/2am will quickly push eastward, reaching the Illinois/Indiana border by early evening.
409 AM EST Wed Dec 28 2016 A cold front will move south of the area around sunrise allowing weak high pressure to cross the area today. The front may return northward as a warm front tonight.
Medium A broad mid/upper level trough moves across Wisconsin this evening. Upper level divergence increases this afternoon then decreases after midnight as the trough axis moves off.
1143 PM CST Tue Dec 27 2016 Quiet and pleasant conditions continue this afternoon across the area, with afternoon temperatures in the low 50s under sunny skies. There will be a very low end chance for a bit of light rain or sprinkles across far southern Missouri tomorrow along with the low clouds; however, the bulk of precipitation chances will remain south and east of the forecast area. Temperatures will warm nicely on Wednesday despite the cloud cover, with highs in the low to mid 50s for most.
This high wind event will continue tonight but absolute peak may have already occurred.
219 AM CST Wed Dec 28 2016 A jet max over the eastern Pacific moves over the northern plains deepening an upper level trough extending down to the surface as a cold frontal boundary over northern Nebraska. Ahead of this boundary southwesterly winds advance a weak thermal ridge over the area this afternoon resulting in temperatures slightly higher than model guidance indicates with highs in the low 50s.
This feature coupled with an approaching cold front and active STJ will allow for low level Gulf moisture to surge back north. Cloud cover in the south and breezy northwest winds in the north will keep tonight's lows above freezing areawide.
Low's tonight in the low to mid 30's with highs on Wednesday in the 50's.
1257 AM EST Wed Dec 28 2016 High pressure will move across Pennsylvania Wednesday with cooler temperatures.
217 AM CST Wed Dec 28 2016 A jet max over the eastern Pacific moves over the northern plains deepening an upper level trough extending down to the surface as a cold frontal boundary over northern Nebraska. Ahead of this boundary southwesterly winds advance a weak thermal ridge over the area this afternoon resulting in temperatures slightly higher than model guidance indicates with highs in the low 50s.
1110 PM EST Tue Dec 27 2016 Warm moist air overriding the cooler Gulf waters is supporting areas of dense sea fog over adjacent Gulf waters from Tarpon Springs north to the Suwannee River out 60nm. Overnight lows will be quite mild at around 10 degrees above normal in the low to mid 60s.
/ISSUED 910 PM CST Tue Dec 27 2016/ A weak cold front moved into SE TX earlier today and stalled near a De Ridder LA to Tomball to north of Hondo. The cold front appears to be transitioning to a warm front as pressures drop in SE Colorado. The developing warm front will likely move north overnight with light south winds areawide by 07z. Water temps are in the lower 60s and sfc dew pts flowing over the water are near 70.
As a warm front lifts northward through the forecast area today, a return of low-level moisture will increase the chances for low stratus to impact the TAF sites. The front sits just to our south now but will try to work its way back north as a warm front after midnight. /10/ Prior discussion below: Through Wednesday: The cold front will stall near the southern border of the forecast area overnight, with low level flow gradually veering around to the east overnight then more southerly by tomorrow morning. The front will lift back northward early Wednesday as a warm front, with additional low stratus spreading northward early in the day.
A weak cold front on NW flow aloft moved through Northeast Montana overnight with a few isolated snow showers over the northeast corner of the state.
Believe we'll see some patchy fog/freezing fog around sunrise, especially around rivers and lakes. Tonight, it still looks like a cold front will rapidly sweep across the area, with showers, as well as a few thunderstorms (mainly over the south).
MVFR cigs are likely to move back northward as the front returns northward as a warm front early this afternoon. A weak cold front will sink southward through the area today.
348 AM CST Wed Dec 28 2016 H5 analysis from 00z tonight has a broad low amplitude pattern across the lower 48. Winds INVOF of the trough were westerly and northwesterly overnight. Strong H85 winds are present behind the trough, however, cool air advection is weak today, so mixing potential is marginal. This yielded highs in the lower to middle 40s in the south and eastern CWA vs. For tonight: High pressure will build into Wyoming and the western panhandle.
133 AM EST Wed Dec 28 2016 Other than a few high clouds, mostly clear skies will remain in the offing as high pressure moves overhead. A deepening, positively tilted and fast moving trough takes aim at the area Wednesday night.
234 AM CST Wed Dec 28 2016 Split flow aloft over the CONUS early this morning with northern stream in the early process of carving out a trough in the northern and central plains/Mississippi valley regions today.
1227 AM EST Wed Dec 28 2016 Dry weather and seasonal temperature can be expected until the approach of a Wednesday night cold front.
1237 AM EST Wed Dec 28 2016 High pressure moving through Kentucky to West Virginia will keep dry weather over the region tonight through Wednesday. A wave of low pressure traveling along a cold front will bring rain mainly to southern locations Wednesday night.
1107 PM CST Tue Dec 27 2016 Relatively quiet forecast in the near term with high pressure over the central portion of the country shifting east. Low pressure well to the north will also shift east with increasing gradient ahead of the cold front. Will result in increasing flow aloft, and expect to see winds increase along exposed areas such as the Buffalo Ridge throughout the night. Cold front will shift through the area tonight into Wednesday morning.
Low level winds will be increasing from the northwest to north as a weak cold front moves through the area later this morning. Somewhat cooler air invades the region tonight but with winds staying up some, we shouldn't see overnight lows spiking downward quite as hard as the past few nights.
VFR should return to all sites after 14Z as the low clouds and fog burn off. /issued 1110 PM EST Tue Dec 27 2016/ Warm moist air overriding the cooler Gulf waters is supporting areas of dense sea fog over adjacent Gulf waters from Tarpon Springs north to the Suwannee River out 60nm. Overnight lows will be quite mild at around 10 degrees above normal in the low to mid 60s.
A cold front approaches Wednesday evening, with winds becoming light northerly by mid to late evening. Overnight lows will range from the lower 50s north of I-20 to the upper 50s along the I-10 corridor.
300 AM CST Wed Dec 28 2016 Another unseasonably warm day is on tap for eastern Oklahoma and western Arkansas even with a cold front slated to move through the region this afternoon. There is still a small chance of showers and thunderstorms across portions of southeast Oklahoma and west-central Arkansas Today in association with the approaching cold front.
349 AM CST Wed Dec 28 2016 Broad 500 mb trough over the Pac NW into the N Plains.
158 AM CST Wed Dec 28 2016 A jet max over the eastern Pacific moves over the northern plains deepening an upper level trough extending down to the surface as a cold frontal boundary over northern Nebraska. Ahead of this boundary southwesterly winds advance a weak thermal ridge over the area this afternoon resulting in temperatures slightly higher than model guidance indicates with highs in the low 50s.
High pressure will return for the latter half of the week.
524 AM CDT Thu Apr 6 2017 Upper low was centered over northwest Indiana early this morning, and will continue to strengthen as it moves into western Pennsylvania by early afternoon. Showers/drizzle rotating around the low have become more sparse over the forecast area, with the western fringes near the Illinois River at 2 am. The strong pressure gradient will result in wind gusts of 35-40 mph, especially across the eastern CWA closer to the low. The gradient will start to ease up this evening, as a ridge of high pressure builds east toward the Mississippi Valley. Temperatures over a large part of the forecast area are expected to drop to close to freezing as skies clear.
415 AM EDT Thu Apr 6 2017 A cold front will cross the area during the early morning hours. Showers and thunderstorms will continue into the early morning hours, until the main cold front moves east of the area. The cold front moves east of the forecast area Thursday morning, with drier air moving in behind the front. The main weather issue on both Thursday and Friday will be associated with the strong winds due to the tight pressure gradient between deep low pressure moving from the Lower Great Lakes to New England and ridging moving into the Lower Mississippi River Valley. Temperatures quite a bit cooler on both days, with highs in the 60s.
324 AM MST Thu Apr 6 2017 High pressure over the region will result in high temperatures in the 90s today and Friday.
418 AM MDT Thu Apr 6 2017 Large upper ridge is building over the western CONUS. A low-level jet will develop tonight ahead of a trough. Upper ridge axis will cross the northern plains Friday, and southwesterly flow will increase as low-level trough moves through the region. An upper trough will approach the region this weekend.
A large upper-level ridge of high pressure will bring warm spring-like weather to northeast Montana over the next few days. Granted, the southwest flow aloft just upstream of this ridge will introduce some scattered rain showers and maybe a few isolated thunderstorms over central portions of Montana, but are only expected to brush up against or clip our CWA western and northwestern zones. By Friday night, the surface pressure trough will finally push through the area and bring better chances for rain showers and a few thunderstorms to the area. A cold front is expected Friday evening which has enough instability and moisture with it that there could be some showers and possibly thunderstorms with it.
610 AM EDT Thu Apr 6 2017 It will be windy and dry behind a strong cold front today through Friday. The cold pressure ridge behind the front will be near the forecast area Friday night and patchy frost is forecast. Showers and thunderstorms along the strong cold front will exit the forecast area early this morning. Today will be windy behind the strong cold front. The pressure gradient is forecast to remain tight tonight with strong low pressure north of the area, but there should be somewhat diminished wind because of nocturnal cooling and less mixing. The pressure gradient between low pressure in the Northeast States and ridging in the Lower Mississippi Valley will bring breezy conditions Friday. Diminished wind will occur Friday night as the ridge gets closer to the forecast area.