Aikyam-Lab/Synoptic-Bench huggingface dataset:
Drier and cool air will continue through the overnight with atypically strong northwest flow aloft as the upper level low pressure system steers southward through Missouri. Winds should taper off by early to mid evening as the lower atmosphere decouples, but still retain some northerly component much of the night. A quick and strong warmup will ensue Wednesday with the upper low heading eventually east towards the mid-Mississippi valley and upper heights build across the southern high plains. Additional warming will follow Thursday with a flattening upper ridge axis passing overhead and very warm 850 millibar temperatures in the lower 30s Centigrade move onto the Caprock.
A low pressure system will strengthen over the Ohio Valley tonight and slowly lift north into the Great Lakes region Wednesday and Wednesday night. Periods of showers and thunderstorms will accompany the low from Wednesday into Thursday. Upper trough to the west this evening continues to funnel moisture northward into the Great Lakes region. The upper trough slowly moves east through the area over the next couple of days. We will slowly dry out from Thursday into Thursday night as ridging begins to slide in from the west. Bottom line, fairly wet and slightly cooler than normal.
Deep moisture still available under the upper low today will result in another showery day. and overnight lows will be limited to the lower 50s/upper 40s as the clouds slowly recede later Thursday morning. Skies clearing early Thursday will result in a little warmer temperatures for Central IL. Dry through Thursday night, although the models are still having some issue with the weak ridge aloft.
423 AM MDT Wed May 24 2017 A sharp high pressure ridge will provide for a warm and dry day across the forecast area. 700 mb temps warming to +12C and downslope winds support highs pushing into the lower 80s along the Front Range. Don't expect anything more than scattered convective clouds this afternoon with the ridge axis and dry airmass overhead. Thursday will see a cold front move into northeast Colorado as a subtropical jet aloft spreads across the southern half of the state.
/44/ Scattered showers and isolated thunderstorms will continue tonight as a cold front moves through the state. Upper low pressure will move south through Missouri tonight and clip northeast Arkansas on Wednesday. Rain chances will continue until this low moves east of the state. Clouds and the presence of the upper low Wednesday will keep our temperatures cool. High pressure builds into the area Thursday and with more sun, temperatures will climb to closer to normal values.
254 AM CDT Wed May 24 2017 Early this morning an upper low was located across south central IA. This upper low will dig southward across central MO Today, then southeast across the lower MS river valley Tonight. The EXP-HRRR solution may be possible given the proximity of the cold core upper low across central MO. Though there will be isentropic downglide on the west side of the H5 trough axis that may inhibit showers from developing across the eastern counties of the CWA. Lee troughing develops Thursday as upper ridge builds into the Missouri Valley. Low levels will see increasing moisture, but the ridge aloft helps bring and elevated mixed layer in, with 800mb temps near 20C.
At the surface, the ridge axis has been shunted to south of the state as low pressure moves through the southeast with a trailing cold front. An approaching cold front will bring deteriorating conditions to the region for much of Wednesday, with lowered cig and vis in showers and thunderstorms possible starting in the morning and continuing through the forecast period. Marine conditions will continue to deteriorate tonight into Thursday as a cold front approaches the region and moves south through the waters. Once the front passes through, winds and seas will decrease for the end of the week and into this weekend as high pressure builds over the region.
An area of low pressure will move into the area from the Pacific as high pressure weakens. Temperatures will cool due to increased onshore flow and cooler air aloft today and Thursday. A ridge of high pressure will then become reestablished this weekend for another warming trend. The Rex block pattern with high pressure over low pressure is quickly breaking down the as the high weakens over the Great Basin and the low pressure moves northward off the coast. Water vapor imagery shows the low now centered near 32N/127W and lifting northward. Some convection is noted moving west of Point Conception as the cooler air aloft associated with the low is more unstable. As is always the case, cooler air will spill into the San Joaquin Valley, lower slopes as well as the Kern County Desert later this afternoon and evening.
631 AM EDT Wed May 24 2017 Showers will become widespread by late today as an upper low moves into the area.
/Issued 353 AM CDT Wed May 24 2017/ An upper low over southern Iowa early this morning will move south into northeast Arkansas by this evening.
The pressure gradient will strengthen on Thursday as low pressure across west Texas interacts with high pressure across the central Gulf of Mexico.
329 AM EDT Wed May 24 2017 High pressure will linger today, keeping the weather dry with a mix of sun and clouds.
1238 AM CDT Wed May 24 2017 Expecting temps to gradually decrease the rest of the evening with the passage of a cold front earlier today. Most of the scattered light showers that developed on the backside of the upper level low have departed the CWA this afternoon. Although still cooler than normal, Wednesday looks to be a much nicer day than today as weak ridging moves into the area. Expecting thunderstorms to develop in the high plains (KS/NE/CO border) and consolidate into a line that tracks to the east.
309 AM EDT Wed May 24 2017 High pressure will linger today, keeping the weather dry with a mix of sun and clouds.
436 AM EDT Wed May 24 2017 Currently - A deep layered amplified trough is moving into the eastern United States, with its tail end dipping into the Gulf of Mexico. The previously mentioned trough will edge eastward across the Gulf of Mexico today, into the Atlantic on Thursday. However all guidance suggests that winds will trend sharply upwards tonight, becoming windy as the gradient is pinched between the migrating trough and the ridge to our south. Winds will relax significantly late Thursday as the trough lifts out and leaving a very lack luster gradient across the Keys.
650 AM EDT Wed May 24 2017 Periods of wet weather with cooler-than-average temperatures will dampen the area for the second half of the week.
Looking at the regional radar loop, the bulk of of the rain is located closer to the upper low (read northwest of the area), leaving a more isolated to scattered coverage to our west to move over the area this morning. With southeast portions of the forecast are seeing the cooler air last, a northwest to southeast gradient with respect to highs is expected today. Tonight, the cooler air overspreads the entire forecast area, with overnight lows dropping into the well below seasonal low to mid 50s. A northwesterly flow aloft in wake of the system will herald a drier airmass into our area as ridging, both at the surface and aloft, moves into the forecast area. The result will be drier and slightly cooler conditions for the 36-48 hour time period.
421 AM MDT Wed May 24 2017 It is shaping up to be a nice day across southeast Wyoming, and the western Nebraska Panhandle with the development of pronounced upper level ridging over the central Rockies. This will result in a strong pressure gradient across southeast the area, with the low-level CAG to CPR height gradients even exceeding 50 meters. Large scale blocking downstream over the Ohio Valley should help to force a cold front south across the CWA on Thursday. Continuing cool/unsettled into Fri given persistent troughing over the north central US. An upper level low in southern Canada will move very little through the weekend, keeping the forecast area on the western flank of this low as it drifts south into the northern plains/Great Lakes region.
1111 PM MDT Tue May 23 2017 One last day of cool N-NW flow over the region today, with brisk N winds and a few sprinkles noted as back edge of cooler air aloft rotates southward across the plains. Once winds die and clouds clear, min temps will drop to fairly cool levels, though most locations except for the higher mountain peaks should stay above freezing. On Wednesday, upper ridge builds into the Rockies, leading to lighter winds and much warmer temperatures areawide. Precip chances will be nil with building ridge and dry wly flow. upper level high pressure over Colorado will shift east into the Central Plains overnight, while the next upper disturbance begins to move across Wyoming late.
The large low pressure system that's been moving through the area over the past 24 hours will reintensify over southern Indiana/Ohio today with ridging gradually taking hold over Wisconsin. Today will be the coolest of the week ahead with warmer temperatures in the forecast after today.
1138 PM MDT Tue May 23 2017 High pressure ridging will bring warmer air aloft with 700 mb temps up to 12 to 13C by Wednesday afternoon.
232 AM CDT Wed May 24 2017 A mid/upper trough over the Upper Mississippi Valley area this morning is progged to dig south and southeast into the Lower Mississippi Valley area through the day. Meanwhile, high pressure at the surface will build across the Central Plains states.
412 AM EDT Wed May 24 2017 Periods of wet weather with cooler-than-average temperatures will dampen the area for the second half of the week.
430 AM EDT Wed May 24 2017 Showers will become widespread by late today as an upper low moves into the area.
311 AM CDT Wed May 24 2017 At 3 AM CDT, latest H5 analysis depicts an upper low centered over southern Iowa and northern Missouri with a trough axis extending southward through central Arkansas. A ridge of high pressure is located well off the Atlantic seaboard, with southwest flow aloft over the local region between these two features. Showers and a few thunderstorms will continue this morning and into the afternoon as the trough axis moves over the region. Showers and thunderstorms will gradually diminish this afternoon from west to east as the trough axis migrates eastward while the upper low centers over the region.
310 AM CDT Wed May 24 2017 The upper low will move south towards the Mid-Mississippi Valley today. As this occurs, upper level ridging will begin to approach from the west later today and tonight. NAM soundings show steep low-level lapse rates and with upper level cold pool still lingering across the area, a few showers will remain possible today, but coverage will be more spotty with decreasing influence from the upper low. Late this week through the Memorial Day weekend, an upper low initially centered over the southern Canadian prairies Thursday night will gradually sink south and eastward into the Great Lakes region through the weekend.
A potent low pressure system over Canada and associated front will continue to drop southeastward through the day today. Temperatures will be about 10 to 15 degrees cooler on Thursday with 60s expected across the region.
Lower/mid 80s max temps should pre- vail this afternoon with lows tonight in the lower 60s inland to the lower 70s along the coast. Warmer temps expected by the week- end with low 90s possible starting Fri afternoon. The upper ridging over the region (today/Thu) will be flattening by Fri as the main low/trof moves off the NE coast. The building ridge over the west coast will help maintain the zonal flow over the state through the weekend. The return of onshore winds along with Gulf moisture could produce some isolated showers along the coast late Sat night, but the main focus should be further north as a weak cold front moves down from the Southern Plains.
A deep upper trough will dig southeast into the Tennessee Valley with jet dynamics moving across the Region. Main question is if there will be enough breaks in the cloud cover today allowing the low-level airmass to destabilize.
405 AM CDT Wed May 24 2017 Upper level ridge axis extended from southern MAN to WY. Satellite loop indicated cirrus was spilling over the ridge and over the forecast area. Water vapor loop indicated upper level ow pressure system was located over southern BC and southern ALTA with upper level jet rounding the base of the trough. Upper trough will move into southern SASK Wed night an rotate over southern SASK and southern MAN through 12Z Sat. Upper level low will send a cold front across the area Thu and produce showers. During the holiday weekend, the models are in good agreement that a strong mature low pressure system over Manitoba slowly meanders eastward toward the Great Lakes region.
331 AM CDT Wed May 24 2017 Cold front and associated showers and thunderstorms are located across the southeastern zones and will be for the most part exited the area by sunrise. In the wake of the front cooler and drier air is working into the region. High pressure will continue to build into the region today in the wake of a cold front that moved through the region overnight. resulting in cooler drier airmass with gusty north and northwesterly winds. Return flow begins on Thursday as the high shifts to the east resulting in increasing temperatures and humidity through the remainder of the week. In the wake of the cold front this mornings winds will be near 20 knots and gusts around 25 knots.
A cold front, and the east northeast moving showers and isolated storms associated with it, will continue to shift east through the forecast area this morning. During said afternoon, a closed upper low and attendant trough, currently observed on the latest water vapor imagery dropping through the Mid-Mississippi River Valley, will continue dropping south southeast into the Mid-South region, before pivoting east through the Tennessee Valley overnight tonight. Cooler drier conditions will also have advected into the region during the period. As a result, look for a cool morning Thursday as lows bottom out in the low and middle 50s.
The northern-most front is associated with a bit more forcing aloft than the southern boundary, but both fronts should have waves of low pressure move along them today. The airmass will dry out a bit as the behind the cold front on Thursday. However, a few storms will remain possible across portions of the northern CWFA as an upper low/trough move through. NListemaa Upper low/cold core aloft expected to move across AL/TN and Georgia Thursday night with the trough axis moving east of the forecast area btwn 15-18z Thursday.
229 AM EDT Wed May 24 2017 Upper level low digs into the Tennessee Valley and brings chances of showers today through Thursday. Upper low over the Ohio Valley early this period gets kicked out by end of this period. Til then, upper disturbances swirling around this upper low will bring likely chances for showers through the day Thursday. Temperatures will be cooling by Thursday as we get on the back side of the upper low itself, with temps slightly below normal for this time of year with all the clouds and showers.
At 2 AM MDT dry cold front was evident on water vapor satellite imagery extending from near Great Falls, MT, through Ontario, OR, to Klamath Falls, OR, moving steadily southeast. Front will bring some clouds and a wind shift to west or northwest, followed by much cooler weather and stronger winds this afternoon. Aloft, a deep low in BC will move east across western Canada and the associated upper trough will overspread our area today through Thursday. A reinforcement from BC will deepen our trough and keep temps below normal Thursday.
H7-h5 upper trough over eastern IA per RAP settles southward to MO-southern IN through midday. Northeast winds btwn the low over the Ohio Valley and high pressure nosing in from Hudson Bay and northern Ontario will keep temps well below normal today. Normal highs for late May are in the low 60s near Lk Superior and near 70 along the WI border. High pressure over the western area could lead to skies partially clearing. Kept mins in the 37-39 range at the lowest and put fog in forecast.
For tonight have trended the minimum temperatures down by using the lowest of all guidance for low temperatures tonight. This would have worked out well last night as well as temperatures were 5 to 7 degrees cooler across the southwest than the ensemble guidance was. The cold front will be the focus for showers and isolated thunderstorms along a narrow band of instability Wednesday night. By Thursday the showers will be departing to the east and cooler temperatures into the 60s to around 70 seam reasonable.
An inland cooling trend will continue through late week as high pressure weakens and the marine influence increases. Minor warming is then expected during the upcoming weekend as high pressure returns to the West Coast.
237 AM CDT Wed May 24 2017 WV imagery this morning showing an upper level closed low over the mid MS vly getting kicked eastward in response to a well amplified ridge extending from the from Great Basin into central Canada building into the Plains.
152 AM MDT Wed May 24 2017 Latest upper analysis shows the closed low moving northeast with a ridge approaching from the west. At the surface winds continue to increase as the low level jet over the forecast area begins to mix down to the ground. In fact the low level temperature field was cooler last night over Eastern Colorado and lows only fell into the mid 30s. A warm front will move through the forecast area from the west.
Northerly winds in wake of the cold front passage will persist overnight through Wednesday morning, with a gradually returning onshore flow Wednesday afternoon/night.
A deep upper trough will dig into the Tennessee Valley today producing scattered showers/storms this afternoon/early evening.
1250 AM CDT Wed May 24 2017 As an upper level low drops southward through Iowa this evening bands of showers continue to wrap around the low pushing eastward through central IL. Temps will remain cool Wed night with Thur highs warming slightly with west central IL reaching into the low to mid 70s.
Upper and surface ridging remains over the area with clear sky and calm winds tonight. Chattanooga Airport, TN 45 77 51 76 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 45 76 49 76 / 0 0 0 0 Oak Ridge, TN 45 77 48 76 / 0 0 0 0 Tri Cities Airport, TN 39 77 45 77 / 0 0 0 0.
1005 PM EDT Thu Oct 19 2017 High pressure will dominate the weather through the weekend.
Meanwhile, the eastern rim of broadly cyclonic flow aloft, peripheral to a longer-wavelength trough amplifying over the western states, will begin overtaking the aforementioned disturbances through the day on Friday.
1045 PM CDT Thu Oct 19 2017 Upper level ridging will spread across the area tonight as troughing deepens over the Rockies.
May see IFR ceilings develop across the far south toward morning, and a few light rain showers are possible, as well, as the low level jet strengthens overnight. With increasing moisture and more general cloud cover tonight, temperatures will be warmer, with lows only getting into the low to mid 60s for most of the area.
Southerly winds will help keep the temps up tonight and provide a warmer starting point for tomorrow. Expect readings to get a few degrees warmer this afternoon before starting to fall off this evening. Dry weather continues under a ridge that moves out as a trough approaches this weekend.
1155 PM EDT Thu Oct 19 2017 High pressure will dominate the weather through the weekend.
Current dew points in the lower 50s may lower overnight as the light southeast winds advect in lower dew points from GA which are currently in the lower 40s. Temps were raised slightly in areas that were warmer the previous nights, due to valley fog, and slightly lowered in other areas to account for trends. Lows will be in the lower to middle 40s, with an isolated spot possibly dropping to the upper 30s.
The ridge moves east as the trough entering the western U.
High pressure aloft brought sunny skies while southerly breezes kicked in. For tonight, look for temperatures to fall into the low 50s.
745 PM EDT Thu Oct 19 2017 High pressure will remain over the eastern conus through the upcoming weekend.
First Significant Cold Front of the Fall Season Will Push Through Tonight. High pressure centered to the north will maintain a 5 to 6 mb gradient along the east coast of Florida.
Satellite imagery shows plentiful cirrus flowing overhead as a weak trof digs through the Rockies into Texas. High pressure is over the southeast states at the surface and aloft. A trough is over the Pacific Coast. Through the next couple of day the ridge will continue east bound and the trough will advance toward the plains. This will serve to gradually break down the upper ridge locally and allow a few showers and storms by Friday with a few streamer showers moving in by the morning.
1116 PM CDT Thu Oct 19 2017 Pleasant weather conditions to continue through tomorrow as high pressure at the surface and aloft hold across the region.
Tonight and Friday Quiet weather with even warmer temperatures can be expected across the area tonight and Friday.
1029 PM EDT Thu Oct 19 2017 A cold front will cross the region tonight and will be followed by high pressure on Friday.
Ahead of a Pacific low pressure trough, strong winds are expected developing late Friday Morning continuing through Friday evening. The Pacific low pressure trough is expected to bring areas of moderate to heavy snow showers to the mountains developing Friday morning and becoming more widespread Friday afternoon and night. The snow showers will be accompanied by strong west winds of 30 to 40 mph with gusts to 50 mph on the passes and higher ridges.
Southerly winds will be a little stronger tomorrow than previous days as trough out west approaches.
Mostly clear skies with mild lows ranging from the lower 40s in the northwest, to the lower 50s in southeast.
Afternoon surface analysis shows an area of high pressure centered near the Eastern Tennessee and Kentucky borders this afternoon. This will keep upper 30s to lower 40s in the eastern deeper valleys with mid to upper 40s on the ridges. The upper level ridge does start to march east Friday night, and some return moisture in the upper levels could lead to increase high clouds overnight. Despite this we will still see some ridge/valley temperature split and patchy dense valley fog. We are expecting a ridge of high pressure to bring warmer than normal temperatures and dry conditions to eastern Kentucky over the weekend.
Dew points are in the low to mid 70s. The boundary layer will be able to retain its moisture through the short term, so despite continental air filtering into the upper- levels (a the spinning anticyclone continues to build in the Carolinas), the potential will exist for showers - all that is needed is a trigger. Winds have increased as expected this evening, and will freshen overnight and into Friday as an anticyclone builds across the Southeastern US, tightening the pressure gradient across our coastal waters.
Temperatures Friday morning will be a little warmer than this morning, especially across the southern counties.
Near the surface, a lee side trough of low pressure is anchored across southeast Colorado. Ridging has moved into Mississippi Valley.
The cold front, which is currently located in central Oregon, is still on track to move across SE Oregon late tonight and SW Idaho Friday morning. Rain will also accompany the front, followed by showers associated with an upper trough on Friday. Temperatures will be 15-30 degrees cooler on Friday with highs only in the 40s and 50s. VFR with increasing and lowering clouds tonight ahead of a Pacific cold front, currently timed to arrive in KBKE and KBNO about 06Z, KMYL and KBOI about 09Z, and KTWF and KJER about 12Z.
1025 PM CDT Thu Oct 19 2017 High pressure continues across the Mid-South with mostly clear skies. /issued 252 PM CDT Thu Oct 19 2017/ High pressure remains in control of the current Midsouth weather with light south winds running temperatures in the mid and upper 70s. about 3 to 5 degrees warmer than yesterday.