Aikyam-Lab/Synoptic-Bench huggingface dataset:
849 PM CDT Fri Oct 20 2017 Another cool night in progress across the Mid-State, as patchy cirrus wafts northward along the back side of an upper Ridge that extended from Georgia to West Virginia early this evening.
1007 PM EDT Fri Oct 20 2017 High pressure will shift off to the east through the weekend.
Continued ridging into the Tennessee valley will produce light winds through the forecast period.
A cold front will enter northwest Oklahoma after 19Z Saturday. A cold front will enter northwest Oklahoma after 19Z Saturday. For Saturday afternoon, a cold front is expected to enter northwest Oklahoma by early to mid afternoon a as mid-level trough ejects into the Plains. Thunderstorms along the cold front are expected to quickly grow upscale into a quasi-linear convective system as it shifts southeastward into central Oklahoma due to strong, linear forcing and shear vectors becoming parallel to the front. Nearly all convective-allowing models (HRRRX/NSSL WRF/HRW WRF- ARW/HRW NMMB) do initiate convection along this trough axis, ahead of the cold front. Any cells that develop along the trough across southwest Oklahoma/western north Texas have the potential to remain discrete/supercellar longer before becoming undercut by the cold front.
1228 AM EDT Sat Oct 21 2017 High pressure will remain anchored over the Upper Ohio Valley through the weekend.
Passage of the cold front, pressure rise, and shower mixing the winds. At 6 PM CDT a cold front extended across eastern Montana and will move into western North Dakota this evening. Tonight, an upper level trough begins an eastward progression across the Northern Plains. A strong associated cold front will move east ahead of the upper trough into western North Dakota tonight, then into central ND by 06Z Saturday. A series of upper level troughs are forecast to move across the Northern Plains through the extended.
Temperatures warm slightly by late week and into the start of the upcoming weekend as a ridge of high pressure builds across the eastern Pacific. Longer range models are currently suggesting a cooler and potentially wetter pattern developing late in the forecast period. Much cooler conditions prevail over the region this afternoon compared to previous days as a mid/upper level trough impacts the region. The models do depict a cutoff low developing and then shifting off of the southern California coast through midweek which will help keep temperatures cooler (near seasonal averages). Temperatures are forecast to warm slightly back to above seasonal averages late in the week and into the start of the upcoming weekend as high pressure over the eastern Pacific shifts back toward the West Coast.
1150 AM EST Mon Feb 12 2018 High pressure will provide fair weather today into Tuesday.
This will keep winds out of the N/NE and the cooler air in place for one more night. The coldest locations will be in NW AL and in southern middle TN where lows could hit freezing. Localized convergence along this feature could result in light rain developing over the higher terrain and have kept low end PoPs in the forecast out east. About the same time this is occurring an upper level ridge begins to build over the central Gulf of Mexico. Winds shift to the E/SE Tuesday and warmer air returns to the TN Valley. Despite the cloud cover guidance have highs Tuesday in the lower 60s for the western half of the area.
High pressure is building across the Upper Mississippi Valley and will build east across the Great lakes region overnight tonight. So, even with light winds and a dry air mass at the lower levels, only expect that temperatures will drop into the single digits overnight tonight. Through the day tomorrow, low level flow will continue to shift to more southerly through the day as low pressure develops over the western plains. Increasing low level warm advection should allow temperatures to rebound back to the lower 30s.
Taking a look at the 500mb pattern today, much of North America (minus eastern AK and western Canada) is under the influence of a large trough extending from the main low over northern Canada. The result has been a subtle ridge developing over WY/SD. The slight ridging will remain overhead through today, and become surpressed tonight as the northern extend of the western trough moves in. Closer to the sfc, we're still under the influence of a ridge of high pressure, extending from northeastern MT/western ND. Warmer air on the back side of the exiting high, on south-southwest winds and still plenty of clouds, will keep temperatures from falling too far tonight.
1222 PM EST Mon Feb 12 2018 WV imagery and RAP analysis indicated a trough from ne Canada and Hudson Bay into the nrn Great Lakes resulting wrly mid/upper level flow through the region. At the surface, a ridge of arctic high pressure extended from Saskatchewan and Manitoba into the nrn plains and Mississippi valley. Tonight, favorable radiational cooling conditions this evening will allow temps to drop to around -10 inland, toward the lower end of guidance, before increasing clouds and weak WAA result in rising temps late.
High pressure over eastern MT resulting in NW sfc flow over valley and adjacent regions.
411 PM EST Mon Feb 12 2018 High pressure will build into the area through Tuesday, passing east Tuesday night.
1247 PM EST Mon Feb 12 2018 A cold front will sink southward and into the forecast area this afternoon.
The 18 UTC surface analysis shows that the cold front is beginning to stall across our far western zones. Extensive cloud cover has kept temperatures generally in the mid to upper 60s today, though where some gaps in the overcast have developed, temperatures are in the lower 70s. Model guidance is in good agreement that cloudy conditions should then prevail overnight and with little in the way of cooler or drier air making it into the region, overnight lows should be quite mild for February, in the lower 60s.
255 PM EST Mon Feb 12 2018 High pressure will build into the area tonight bringing mainly clear skies and light winds, and a mild and sunny day for Tuesday.
1040 AM PST Mon Feb 12 2018 Cooler temperatures this week.
324 PM CST Mon Feb 12 2018 After another cool day today we'll see another cooler than normal overnight into tomorrow morning with temperatures bottoming out into the teens and low 20s across the region.
1114 AM CST Mon Feb 12 2018 High pressure building into the area early this morning. Main concern will be impact of weakening mid-level trough ejecting out of the Rockies into the Upper Mississippi River Valley region tonight into Tuesday. Otherwise, plan on another cold day today with high pressure overhead.
248 PM CST Mon Feb 12 2018 20Z water vapor imagery shows a closed low over northern NV with an upper trough over Hudson Bay. At the surface, ridging remained over the Great plains with the high centered over the upper Midwest. Although the ridge is weakening as obs indicate pressure falls along the lee of the Rockies. Southerly winds through the day Tuesday are expected to bring warmer air into the region with highs reaching around 50.
1119 AM CST Mon Feb 12 2018 Cold high pressure centered over west central Minnesota this morning will dominate the weather across our area for the next 24 to 36 hours. Temperatures this morning were slow to recover, especially over the snow covered areas where temperatures were in the low to mid teens, while over southeast IL where no snow was reported on the ground, mid-morning temperatures were into the mid and upper 20s. The center of the cold air mass will pass across the lower Great Lakes tonight while upper level heights start to build over the region in response to an upper level trof digging southeast across the western U.
We could see a few light showers during the night as a weak area of low pressure/inverted trough develops over the region. Cooler air is advecting into the region and lows tonight should fall into the 30s and low 40s. could see a brief period of freezing drizzle. Any freezing precipitation should be very limited.
237 PM EST Mon Feb 12 2018 Upper air pattern consists of a 500 mb trough and closed low in the western U. this morning and a broad 500 mb trough across central and eastern Canada down into the Great Lakes region and a ridge off the se coast. The ridge moves into the Gulf of Mexico 00z Wed with the trough in the western U.
Morning fog has lifted but a few light showers will linger over the Southern Appalachian Region today as a cold front slowly pulls away from the area. cooler air mass will slowly filter into the area this afternoon behind the exiting front. Chattanooga Airport, TN 46 53 43 61 / 40 30 20 20 Knoxville McGhee Tyson Airport, TN 41 49 40 57 / 50 30 30 20 Oak Ridge, TN 42 50 40 57 / 50 20 20 20 Tri Cities Airport, TN 43 49 38 54 / 60 40 30 30.
109 PM CST Mon Feb 12 2018 Early this afternoon, strong high pressure extended from the Upper Midwest to the TX Gulf Coast. Across our region, occasional high clouds prevailed, along with chilly northeast winds about the high. The high tonight through Tuesday will head east, allowing for southerly backside flow to develop, the start of what will be a noticeable warming trend.
A low pressure system sits over the Great Basin and is moving southward away from Idaho.
245 PM CST Mon Feb 12 2018 WV imagery shows the upper-lvl trough that made landfall on the OR coast yesterday is now over nrn NV, putting West Texas and Southeast New Mexico under SW flow aloft. Meanwhile, the upper trough over NV is forecast to jog SW, to just off the SoCal coast by 06Z Wed. However, all models dig a secondary trough out of the PacNW that intercepts the first. As the trough moves east, it is set to push a strong cold front into the FA by 12Z Fri, taking temps well-blo normal by Fri afternoon. As the trough moves east, large-scale ascent ahead of the trough, combined w/the approaching RR quadrant of an upper jet, could kick off -SHRA over the NW zones as soon as Wed night.
By early this afternoon the low stratus had eroded except for a small patch east of our area between Eufaula Lake and the northern edge of the Ouachitas. Overall a pleasant day albeit still cooler than normal for mid- February. We added a slight chance of non-measurable drizzle/freezing drizzle for a small area in south-central/southeast Oklahoma (in the vicinity of Durant) since short term model soundings show sufficient depth.
1107 AM CST Mon Feb 12 2018 A reinforcing arctic cold front is settling south through the far southern CWA early this morning and will eventually stall just south of the CWA for today, leaving us with a cold low-level air mass as another upper level jet streak helps induce flurries/light snow north or the front over the bulk of our CWA for late this afternoon into the evening.
Winds will become more southerly on Tuesday with the high to our east. High pressure dominates today and tonight.
200 PM EST Mon Feb 12 2018 High pressure will provide fair weather today through Tuesday.
201 PM CST Mon Feb 12 2018 A positively tilted upper trough will extending from Montana through the Great Basin with a closed low over Nevada.
1248 PM EST Mon Feb 12 2018 Broad high pressure centered over the Dakotas will build across the Ohio valley and lower Great Lakes today and Tuesday before reaching the east coast Tuesday night.
1217 PM EST Mon Feb 12 2018 A cold front will sink southward and into the forecast area this afternoon. A cold front was located in the Upstate SC northeast into central NC at 17z. Weak short wave troughs moving thru the area in southwest flow aloft with lift focus in the coastal plain. The low level convergence has shifting to the coastal plain and that's where a few showers were located. The temperature guidance was close with highs in the lower and middle 70s this afternoon.
1153 AM EST Mon Feb 12 2018 A cold front will cross the area early this morning.
1255 PM PST Mon Feb 12 2018 A low pressure system moving through California and then off the coast, will bring cooler weather through Tuesday along with a chance for showers at times.
254 PM EST Mon Feb 12 2018 High pressure over the Northern Plains is currently influencing our weather in the lower Ohio Valley. Stratus over the Lake Cumberland Plateau should break down by early evening, but models indicate the stratus either moving back in or forming in the low levels shortly after midnight. A warm front will lift north of the region by Tuesday afternoon, and winds will switch from northeast to south/southwest. There are some rather large differences in raw model output between the GFS and NAM for high temperatures tomorrow, which are largely influenced by whether or not low stratus develops along and behind the warm front.
High pressure is building across the Upper Mississippi Valley and will build east across the Great lakes region overnight tonight. So, even with light winds and a dry air mass at the lower levels, only expect that temperatures will drop into the single digits overnight tonight. Through the day tomorrow, low level flow will continue to shift to more southerly through the day as low pressure develops over the western plains. Increasing low level warm advection should allow temperatures to rebound back to the lower 30s. This warming trend into the middle part of the week will bring warmer temps to the area, however, still not overly confident with high temps with current snowpack in place and possible cloud cover.
1243 PM EST Mon Feb 12 2018 A cold front continues to pushes slowly offshore through this afternoon, followed by high pressure that will build across the area into Tuesday.
232 PM EST Mon Feb 12 2018 High pressure will build into the region from the Great Lakes today through Tuesday, bringing quiet weather.
A piece of the upper ridge over the eastern Pacific will build in over the region today. These clouds should dissipate through the remainder of the morning as the low level air mass dries further.
Looking at temperatures and dew points rain is becoming more of a possible outcome or snow that falls may have less of a chance accumulating on roadways in the lower elevations. Snow has been falling steadily along the Highway 160 corridor from Pagosa to Durango as temperatures cooler than anticipated there.
Similar scenarios this season have shown a reluctance to let go of the coldest temperatures, especially in the lower elevations and river valleys.
Tuesday will be another generally sunny but cold day, as the frigid start leads to a sluggish warming of temperatures under stable high pressure.
A few light showers will linger over the area today and will see little erosion of the low cloud cover. an inverted trough will develop over the area and isolated to scattered light showers are expected. with the low clouds and some areas of fog.
/Issued 933 AM CST Mon Feb 12 2018/ A very cold start this morning but will see considerably warmer temperatures by this afternoon with skies becoming sunny and generally light east winds. Once the low clouds do erode, VFR conditions will prevail through the remainder of the forecast. High pressure will move slowly east of the region today with light easterly flow.
This will set up a cold air damming pattern resulting in a backdoor cold front moving into Central AL. In all likelihood, the only noticeable impact from this backdoor front is moderation of the high temperatures in the eastern portions of the state on Tuesday afternoon.
353 PM CST Mon Feb 12 2018 The cold front that moved through the local area last night looks to have finally stalled about 50 miles south of the mouth of the Mississippi River. An upper ridge will build east across the central Gulf of Mexico Mardi Gras day and remain centralized there through the rest of the week. Upper level ridge settling in over the central Gulf will expand enough to push most showers north of the area. Blended guidance has been too cool lately for warmer days, so used some MEX component for max temps.
1012 AM MST Mon Feb 12 2018 Upper low over northern NV with southwest flow across central Rockies into the northern Plains. An upper trough is strengthening across the western CONUS this morning with flow aloft across the CWA becoming more west/southwesterly.
Short term models are not handling the lower ceilings well and thus advertise higher highs then what intuition would suggest. CIGs should improve back to VFR by around noon as the low level RH values decrease through the morning hours. Upper air analysis last evening showed a broad trough over the country with west-southwesterly flow over Texas. At the surface, high pressure was moving over South Central Texas and winds were generally light. Cooler and drier air has moved in with temperatures five to 25 degrees lower than 24 hours ago and dew point temperatures 10 to 30 degrees lower. The low level flow will be northerly to easterly today and tonight. Tuesday a frontal boundary over the Gulf will push back to the northwest as a warm front pushing moisture back over the region.
306 PM EST Mon Feb 12 2018 High pressure will build in from the west tonight and will crest over the region on Tuesday before moving offshore.
1042 AM CST Mon Feb 12 2018 Cold high pressure centered over west central Minnesota this morning will dominate the weather across our area for the next 24 to 36 hours. Temperatures this morning were slow to recover, especially over the snow covered areas where temperatures were in the low to mid teens, while over southeast IL where no snow was reported on the ground, mid-morning temperatures were into the mid and upper 20s. The center of the cold air mass will pass across the lower Great Lakes tonight while upper level heights start to build over the region in response to an upper level trof digging southeast across the western U.
304 PM CST Mon Feb 12 2018 High pressure will drift east across the lower Great Lakes tonight and be centered over the eastern Great Lakes by Tuesday morning. Another quiet day expected on Tuesday with temperatures edging up across the entire area, although the snow covered sites across the north will struggle into the low and mid 30s, while further south, the combination of sunshine and warming temperatures aloft should yield afternoon temperatures in the middle 40s.
1029 AM MST Mon Feb 12 2018 Main concerns this period will be with some decent snowfall amounts over the higher mtns then a potential wind event later Tuesday evening into Weds. Cold front has moved across the CWA but so far fog has been limited to extreme southeast Wy from about Cheyenne west to near the I-80 Summit area. Lee trough will deepen gradually during the day Tuesday with a pretty good pressure gradient Tuesday across southeast Wy Tuesday night into Weds.
1238 PM EST Mon Feb 12 2018 A cold front will swing through the North Country through the overnight hours and lead to rapidly cooling temperatures just before sunrise today.
231 PM MST Mon Feb 12 2018 Longwave trough currently extends across the Great Basin, with southwest VLow across the Central High Plains. A warm front has stalled just north of interstate 70 in NW Kansas.
1102 AM CST Mon Feb 12 2018 The center of high pressure was across the northern Midwest this morning.
200 PM MST Mon Feb 12 2018 Upper low over ne NV combined with deformation axis and upslope has kept light snow going across much of the area today. The snow will gradually taper off into this evening with just a few flurries lingering into the evening, mainly in the high country.
358 PM EST Mon Feb 12 2018 High pressure will build into the region from the Great Lakes today through Tuesday, bringing quiet weather.
Surface wise, a large western Atlantic ridge axis is reaching into central Florida, with a trough of low pressure in the west central Gulf of Mexico. Little change in the overall synoptic pattern with an east-west oriented, deep tropospheric ridge remaining anchored over the Sunshine State and the adjacent Atlantic and Gulf waters. With the position of the ridge axis, our area will remain on the southern periphery with occasional pockets of moisture associated with a low level wind increase mainly late tonight and again Tuesday night.
A low pressure system developing across the western Great Basin today will impact much of Utah through Tuesday.
Much cooler temperatures and a chance of showers tonight and Tuesday. Warmer and drier conditions are expected the later part of the week with possible Santa Ana winds Thu/Fri. Upper low making its way south through interior CA and expected to turn southwest over SLO County tonight and out over the Pacific. As the upper low moves off the coast it may tap into a little extra moisture with more favorable low lvl flow to generate showers, though at best just scattered and very light.
With the influx of moisture, temperatures will remain near steady overnight in the low to mid 40s.
323 PM EST Mon Feb 12 2018 High pressure will build across the area tonight, before passing off to the east on Tuesday.
The h500 ridge over the northern plains will translate east tonight with a trough over western Canada and the northern Rockies moving to the northern plains by Friday. As the upper trough approaches the GFS/ECMWF continue to be dry late tonight and Friday.
41 Dry high pressure is in control to start the short term period. High clouds start to increase later tonight then the lower level moisture and clouds increase Friday night.
700 PM CST Thu Jan 25 2018 Upper level ridge over the area will shift over the western Great Lakes tonight. Upper level trough/jet streak from UT to MT will shift over the Northern Plains Fri. Think that best chances will again be freezing rain/drizzle, and any amounts will be very light. Lowered the highs a bit to around 30 in the north and central counties and upper 30s in the southwest, not as mild as we had going but still warmer than much of the week and above average. Some breezy winds are expected with the trough, especially in eastern North Dakota.
High pressure is in control with a clear sky over the area. Chattanooga Airport, TN 30 62 41 56 / 0 0 0 20 Knoxville McGhee Tyson Airport, TN 26 58 37 56 / 0 0 0 20 Oak Ridge, TN 26 58 38 55 / 0 0 0 20 Tri Cities Airport, TN 22 58 31 56 / 0 0 0 20.
Winds will remain a bit elevated overnight as a more significant mid to upper trough enters the Rockies through the early morning hours.
1003 PM EST Thu Jan 25 2018 Canadian high pressure builds in overnight and then moves offshore on Friday.
The highest impacts will be mainly above 9000ft where the moisture will be more plentiful.
Quiet and near seasonal conditions prevailed across the cntrl TN Valley, as high pressure over the mid Atlantic Basin remained in control of the overall wx pattern. Temp trends ranged from the mid 40s W to the lower 30s E, under predom clr skies. These few clouds though will have little effect on temps heading into the early morning period, as lows fall mainly into the lower 30s W/near 30F E. An easterly flow across the western Atlantic and Gulf (north of an old cold front) will produce moisture pooling over the western Gulf during Friday and especially Friday night.
The upper trough axis will move across the CWA Friday morning into mid afternoon. The lower wind fields have all southwesterly flow all night into Friday morning for all areas of the CWA. So the moisture associated with the upper trough gets into the western CWA by mid/late evening.
837 PM CST Thu Jan 25 2018 Pressure gradients associated with low pressure moving into the northern Plains will be responsible for a steady south wind around 10 mph overnight, then a substantial increase Friday morning as the trailing cold front draws nearer. High pressure ridge has slipped off to the east and south/southwesterly flow at the surface continued the warm air advection into the region. Temperatures climbing into the 50s ahead of a warm front to the southwest with plenty of sunshine across Illinois today. Tonight, the southerly flow continues and temperatures will remain above freezing overnight, even though the skies will be mostly clear. Concern for the conditions to the southwest today, with highs reaching into the lower 60s, as dwpts fell into the 20s.
842 PM EST Thu Jan 25 2018 High pressure will move overhead tonight, migrating offshore during the day on Friday.