Aikyam-Lab/Synoptic-Bench huggingface dataset:
355 PM CDT Sat Nov 4 2017 A complicated weather day across the Northland, with a mix of drizzle, snow and an area of mixed rain/snow/freezing rain that has been making roads treacherous in spots. Ahead of the trough axis there is a deep layer of warm air advection and a band of frontogenesis along a baroclinic zone in the 850-700mb layer. South of the area of snow, lighter Later this evening and Sunday morning the trough axis will move east through the forecast area, bringing one last wave of precipitation through from west to east, then ending precipitation from west to east Sunday morning. Ahead of the trough, convergence and high low level moisture should produce areas of fog during the evening and overnight hours.
Influence of the trough departs by midday or so though will keep flurries into the afternoon as well with the start of some weak isentropic lift returning.
However, a deep pool of dry air continues to reside below 700mb, and a weak temperature inversion is noted around 900mb due to this continued dry pool in the low levels.
North and east of the James River valley, an hour or two of freezing drizzle is possible as snow showers end, but very little accumulation is expected on roadways as clouds quickly erode and drier air moves in. Nevertheless, be cautious traveling over bridges and watch for slick spots elsewhere. Friday will bring a change to southwest winds and temperatures about 5 to 10 degrees warmer than Thursday.
Chattanooga Airport, TN 29 44 28 53 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 27 42 27 52 / 0 0 0 0 Oak Ridge, TN 27 42 27 51 / 0 0 0 0 Tri Cities Airport, TN 25 40 24 50 / 0 0 0 0.
An area of high pressure off the West coast will dominate the weather pattern across central California for several more days.
717 PM EST Thu Dec 14 2017 A weak ridge of high pressure will slide across the region tonight with cold, but mainly dry conditions.
531 PM CST Thu Dec 14 2017 The cold front has pushed through all sites except KGLS and will finally push off the coast in the next hour or so.
1036 PM EST Thu Dec 14 2017 Update Another cold front will sweep through the Great Lakes Region late tonight and early friday, bringing more lake effect snow showers.
Dry and warmer conditions return to the area for Friday. Highs are expected to be in the 50s to near 60 acrs the southeast plains, in the upper 40s to lower 50s in the Upper Arkansas River Valley, and in the lower 40s in the San Luis Valley.
The current scenario has a SW-NE oriented long wave trough moving through the Midwest with the primary short waves/PV anomalies to our west. As the long wave trough exits, warm/theta-e advection increases across much of the area through the day, but insufficient moisture here will keep any precip relegated to MN and WI even though decent QG forcing will be in place, especially 850/700. /Friday night through Thursday/ Attention in this period will eventually turn to a pattern change with some form of a long wave trough developing across the western CONUS.
Expect the highest totals (1-2") to be across northern WI where snow showers will get a little boost from some enhancement off of Lake Superior, especially late tonight and early Friday when winds turn more NW.
A cold front moving through today will bring breezy and colder weather through this evening.
844 PM CST Thu Dec 14 2017 A weak cold front has moved off the coast and high pressure over eastern CO was slowing pushing south.
/issued 303 PM CST Thu Dec 14 2017/ Wv imagery this aftn shows entrenched upper ridge over the wrn CONUS and trof axis extending from Baja all the way ne into the Great Lakes region. Swwd extension of the trof tapping into Pacific moisture, transporting it newd into much of TX/LA.
644 PM CST Thu Dec 14 2017 Received some reports of freezing mist/drizzle up near Sarles that was making roads slick.
A weak area of low pressure along with an upper level trough produced light precipitation. While most locations have seen light snow, our far northeast has seen freezing drizzle which created slick roadways. With several webcams showing icy conditions, along with SDOT road reports, have issued a winter weather advisory for freezing drizzle for the I-29 corridor. Buffer soundings suggest the freezing drizzle or flurries could last most of the night, which is possible. Some observations are reporting mixed pcpn with temps near freezing. Will maintain a dry forecast over much of the CWA after 0Z tonight, with freezing drizzle and flurries noted in our northeast. The region will see increasing mid-level heights allowing for warmer temperatures to move into the area on Friday. The northeast portion of the CWA will see cooler temperatures with highs in the mid 30s.
624 PM EST Thu Dec 14 2017 High pressure into Friday.
515 PM EST Thu Dec 14 2017 A weak ridge of high pressure will slide across the region late today and tonight with cold, but mainly dry conditions.
Forecast appears to be on track for this evening, with only minor updates made to show a bit cooler temperatures for the overnight with the latest guidance. High pressure moves offshore beginning tonight leading to a warming trend and a continuation of dry and benign conditions. Min temps much milder tonight and forecast to warm into the mid/upper 70s most areas Friday afternoon with slightly cooler afternoon temps along the Se Fl coast due to local seabreezes.
508 PM CST Thu Dec 14 2017 A cool air mass and cloudy skies have kept temperatures in the middle 30s to the lower 40s across the area this afternoon.
A cold front is forecast to move south across the region during Friday.
We remain under large scale cyclonic flow with a strong ridge in place across the western CONUS and the parade of clipper systems moving through the Upper Midwest. Instead, we will see cloudy skies with flurries possible from the low stratus across the entire area. For tomorrow, the ridge shifts east and the baroclinic zone will end up moving through our area ultimately setting up in a NW to SE oriented fashion.
930 PM EST Thu Dec 14 2017 High pressure builds in from the south overnight, and shift east on Friday.
1018 PM EST Thu Dec 14 2017 High pressure into Friday.
432 PM MST Thu Dec 14 2017 00Z TAF CYCLE Upper level trough axis moving through NM this evening, mainly impacting the northeast with cigs around 050 to 060. Clearing with less wind behind the trough overnight. VFR conditions Friday with lee side trough developing in the east, producing moderate southwest winds by afternoon.
630 PM EST Thu Dec 14 2017 Seasonable and fair weather will continue through the weekend, with a dry cold frontal passage expected late Friday.
A weak cold front will brush the area Friday before surface ridging returns Friday night. Persistent southwesterly flow will bring warmer temperatures into the area for the upcoming weekend. The low stratus deck that has lingered through most of the afternoon is finally showing signs of breaking, yielding a mix of sun and clouds in both the northern and southern quarter of the FA (north of I-70 and near and south of the Ohio River), with still a bit of clouds through the center of the area.
As this band of stronger wind speeds move through this region, it will cause the low level height/and pressure gradients to tighten along the Laramie Range and Arlington late tonight into Friday. As a result, we went ahead and upgraded the High Wind Watches to Warnings across Arlington and the Laramie Range late tonight into Friday. Hung on to a High Wind Watch for Bordeaux since it appears the subsidence will be less favorable in that region, and the surface trof tends to hang on in that region. Temperatures will be much warmer than today, due to good downslope affects.
A cold front will continue to bring breezy and colder weather through this evening.
Weak 1020 mb high pressure was settling into central IL this afternoon and providing light to calm winds. A short wave trof moving se into central WI/IA/NE will pivot se across central IL overnight and exit into the ohio river valley during Friday morning. Lows overnight in the lower 20s with light winds this evening becoming WSW 5-10 mph during overnight. Subsidence behind short wave trof moving into the TN river valley during Friday afternoon to allow skies to become partly sunny over CWA. A quiet/dry stretch of weather expected Friday night through Sat night across central/se IL as high pressure drifts east from the southern plains and across the southeast states.
The trough looks to lose support from aloft later in the morning, so little to no precip is expected in east-central and southeastern IL as we head into Friday afternoon. Weak 1020 mb high pressure was settling into central IL this afternoon and providing light to calm winds. A short wave trof moving se into central WI/IA/NE will pivot se across central IL overnight and exit into the ohio river valley during Friday morning. Lows overnight in the lower 20s with light winds this evening becoming WSW 5-10 mph during overnight. Subsidence behind short wave trof moving into the TN river valley during Friday afternoon to allow skies to become partly sunny over CWA. A quiet/dry stretch of weather expected Friday night through Sat night across central/se IL as high pressure drifts east from the southern plains and across the southeast states.
The ridge of high pressure still sits firmly to the west but shows signs of breaking down this weekend into the coming week. A trough of low pressure crashes into the ridge on Friday over the Pacific Northwest and will cause the ridge to slide eastward, as this system dives into the Great Basin. Inversions are expected to return in the valleys on Friday as this ridge slides back over the area, resulting in slightly cooler, yet still above normal temperatures.
An upper trough will move across the Southern Appalachian region late tonight into Friday and there is an area of lower level moisture banked up against the Cumberland rise northeast through Eastern Kentucky this evening. As the 85h trough builds in toward daybreak, a lower layer may become saturated over tri leading to the possibility of an mvfr ceiling forming here for a few hours during the morning; perhaps lifting into a lower vfr ceiling by 15z.
May need to go a little cooler in a few spots. The flow aloft becomes more northwesterly and decreases considerable on Friday afternoon as an upper ridge moves in from the southwest.
High pressure moves offshore beginning tonight leading to a warming trend and a continuation of dry and benign conditions. Min temps much milder tonight and forecast to warm into the mid/upper 70s most areas Friday afternoon with slightly cooler afternoon temps along the Se Fl coast due to local seabreezes.
With temperatures well below freezing, freezing fog is also expected. Made a quick forecast update to increase fog/freezing fog in the weather grids for these areas as well.
Mostly cloudy skies will give way to partly cloudy skies tonight as weak high pressure moves into the area. Upper level ridge to the west will shift over the central states on Friday, as a trof pushes into the western CONUS.
Cold front had moved through the region with northwesterly winds behind the front. By 14-16Z clouds will begin to clear as latest system moves east and high pressure builds back across the Plains.
A weak cold front will brush the area Friday before surface ridging returns Friday night. Persistent southwesterly flow will bring warmer temperatures into the area for the upcoming weekend. High pressure pushed by a westerly flow aloft will keep dry weather across the ILN area tonight.
A weak cold front will move onto the coast late tonight and bring a little rain Friday.
The rain showers/sprinkles will gradually come to an end from northwest to southeast later this afternoon into early this evening as the upper trough exits the area. Decided to go with the cooler model guidance for tonight's lows. We expect upper level ridging across the rockies and high plains with warmer air moving into our area aloft and at the surface with downsloping west southwesterly surface winds.
Broad upper level ridging builds in the wake of this system for Friday with increasing H850 WAA aloft setting the stage for a warm start to the weekend.
RAP40 analysis shows the axis of the H100-H85 ridge over the FL straits interacting with a weakening frontal boundary over the Deep South to produce a steady W/SW flow acrs central FL. Position of the ridge axis will maintain a sharp H85-H70 subsidence inversion over central FL that will keep the airmass capped blo 5KFT. Gentle to moderate SW breeze will persist overnight as a ridge axis over the FL Straits interacts with a weak frontal trof over the Deep South.
Overnight cooldown will likely be tempered a bit by clouds, but still prevailing below freezing in most areas prior to sunrise. /issued 335 PM CST Thu Dec 14 2017/ Today was a chillier day across the Mid-South thanks to the cold front that moved through last night. Temperatures south of the MS/TN border are in the 50s while areas to the north are much cooler thanks to some strato-cumulus clouds.
541 PM EST Thu Dec 14 2017 High pressure builds in from the south overnight, and shift east on Friday.
648 PM EST Thu Dec 14 2017 A weak and dry surface cold front will stall south of the area tonight. An area of low pressure will develop along the NC coast Friday, then tracks northeast while staying offshore Friday night.
At the surface, light northwesterly flow persist behind a cold front that moved through earlier this morning with high pressure building into the central CONUS. Thus, temperatures will cool into the mid to upper 20s, with locations near bodies of water remaining in the lower 30s. Thus, temperatures will be a few degrees cooler than those observed today, with highs in the mid to upper 40s.
Some of this may transition east as the strung out upper trough moves over the area.
912 PM EST Thu Dec 14 2017 Low pressure will remain to our north tonight and Friday as high pressure builds south of the area.
Already seeing gusts of 30-40 mph at Big Timber and Harlowton, courtesy of cold air and high pressures in the valleys of south central MT. Otherwise, have adjusted forecast lows down a few degrees in eastern valleys and at Sheridan as temps have already fallen to the low 20s. The higher elevations will see amounts around 6 to 10 inches.
This will at least impact lows across northern portions of the mid state region as they may not fall as far as previously expected despite surface ridging apex the Texas coastline all the way up into western Canada continues to usher in a cold air advection air mass to our area. It also continues to look like the mid state will remain dry thru Sat evening as southern portion of above mentioned surface ridging apex moves into our region. That above mentioned upper level disturbance passage will result in dry northwesterly flow aloft per enhanced upper level ridging across the western contiguous U. As Sat progresses, an upper level trough will develop across the western contiguous U.
Most of this cloud cover is also overspreading a reinforcing cold front that is now making its way into cntrl AL/GA. Thus, temperatures will be a few degrees cooler than those observed today, with highs in the mid to upper 40s.
ridge aloft. Gradually taper PoP west to east, cutting off all chances by 00z as drier air works into the lower levels and lift weakens. Friday: Mainly fair conditions are expected for western Nebraska as the region lies on the periphery of the ridge (northwest flow aloft). A thermal ridge pushes temps to near 10C, and given efficient mixing, sfc temps should reach the lower to mid 50s region wide (about 15 degrees above normal).
847 PM CST Thu Dec 14 2017 Updated forecast to include patchy freezing drizzle mention northwest/western areas mainly before midnight. The current scenario has a SW-NE oriented long wave trough moving through the Midwest with the primary short waves/PV anomalies to our west. As the long wave trough exits, warm/theta-e advection increases across much of the area through the day, but insufficient moisture here will keep any precip relegated to MN and WI even though decent QG forcing will be in place, especially 850/700. /Friday night through Thursday/ Attention in this period will eventually turn to a pattern change with some form of a long wave trough developing across the western CONUS.
Friday: This begins the process to a more zonal flow aloft in the short term as a trough digs into the Pacific Northwest. This will bring warmer temperatures into the area. Latest runs have this wave out of phase with the main trof across the western CONUS.
A closed upper low sits over the northern Quebec with broad troughing extending south through the western Atlantic. On the surface, high pressure has moved over southern Florida which has caused a shift in the winds to the south-southwest.
The low clouds are still expected to hang around for most of the night before clearing overnight. There will be some higher clouds associated with the upper trough over the region when the low clouds dissipate, but they too should clear early Friday morning.
A weaker flow aloft and much drier air infiltrating into the high plains will preclude any chances for precip during the period. A lee side trough of low pressure will slowly develop and strengthen across eastern Colorado Friday setting up a westerly downslope flow across western Kansas, pushing H85 temperatures well above 0C. A dry pattern will continue into the early part of a the weekend regardless of weak ridging aloft breaking down as it shifts eastward across the Central Plains.
High pressure will build into the area through Friday.
High pressure east of the state will extend back over the region into Friday, with mainly southwest to west winds in place over the waters.
700 PM CST Thu Dec 14 2017 For early evening update have broadened out the chances for freezing drizzle over portions of central North Dakota and James River Valley which is supported by area soundings, and a few observations reporting unknown precipitation. Looking at model soundings, there does appear to be a dry mid level layer which would contribute to lack of ice and bring a chance for light freezing rain, though road surface temperatures are above freezing so impacts very minimal if any. Mid level dry layer is depicted to slide southeast into this same area later tonight and will bring a window for light freezing rain. Band of light snow will develop from far north central ND to across the Red River Valley late tonight into Friday ahead of a warm front and our next embedded S/WV.
657 PM EST Thu Dec 14 2017 High pressure into Friday.
641 PM EST Thu Dec 14 2017 Aviation Another cold front will sweep through the Great Lakes Region late tonight and early friday, bringing more lake effect snow showers.
636 PM EST Thu Dec 14 2017 Low pressure will remain to our north tonight and Friday as high pressure builds south of the area.
Upper air analysis show a nearly zonal (west to east) flow aloft to the southeast of a long wave trof, positioned from the upper Mid-West to across the four corners of the desert southwest. At same time, forecasters note a well defined upper level jet streak strengthening to between 130 and 160 knots from the Mid-Atlantic to Texas in the higher level west southwest flow into the day Friday. Considering this, thick, post frontal cloud cover will hold in place, which support overnight lows on the higher end of the guidance envelope while on the cooler side into the day Friday, where highs will likely be well below climatology.
A upper level trof will swing across the CWA overnight with a piece of energy cutting off over the central Gulf of California. mainly light rain but there could be a little snow mixed in in the higher elevations. The upper low in Sinaloa opens up and lifts northeast over Texas during the weekend.
An axis of high pressure extends across the Keys and surrounding waters.
919 PM CST Thu Dec 14 2017 An area of mostly virga is working its way across the forecast area this evening, though a few brief reports of flurries have been reported with the highest echoes. Influence of the trough departs by midday or so though will keep flurries into the afternoon as well with the start of some weak isentropic lift returning.
/issued 335 PM CST Thu Dec 14 2017/ Today was a chillier day across the Mid-South thanks to the cold front that moved through last night. Temperatures south of the MS/TN border are in the 50s while areas to the north are much cooler thanks to some strato-cumulus clouds.
/issued 227 PM CST Thu Dec 14 2017/ (Tonight and Friday) Cold front that pushed across the area overnight has brought cooler conditions to West Central Texas, with temperatures mainly in the mid and upper 50s. A veil of high clouds will continue to stream across the I-10 corridor and this will keep temperatures from completely bottoming out, but its still gonna be a cold night with temperatures near freezing for many locations.
A cold front will track east across the area Friday evening, improving conditions to MVFR or better. Inversion will continue in the valleys through Friday then mix out Friday night as a cold front moves through.
Pleasant weather will continue into the middle portion of the week as high pressure remains in control across the region.
High pressure will continue to ridge from the Atlantic into the coastal waters through the next several days, with winds generally less than 15 knots and seas of 2 feet or less.
Operational hi res model runs are favoring the mountains and divides for convection this evening, with a little less activity along the lower Arkansas River Valley. At this point, tending to favor the operational runs with less activity over the lower Arkansas valley than to the north, south and west as stability may again be an issue. An upper level ridge is forecast to be centered to the south of CO, mainly over NM and TX, Wed night through Sun. As a result there will continue to be daily chances for showers and thunderstorms, being most numerous over and near the higher terrain in the late morning hours through the evening, and spreading acrs the southeast plains in the late afternoon and nighttime hours.
1238 PM CDT Tue Aug 8 2017 High pressure was centered over the upper Midwest early this morning.
However, an upper level trough is projected to dig southward into the southeastern CONUS later in the morning through the afternoon hours. The combination of ample moisture, moderate instability, and forcing from the aforementioned front and trough should lead to fairly high coverage of showers and thunderstorms from the late morning through the evening. A few locations that see the least cloud cover during the late morning and early afternoon could reach the lower 90s.
6" is across the region with the highest values near the disturbance. Rain chances will gradually decrease from Wednesday through the weekend as the disturbance move east and weak high pressure builds in.
1251 PM CDT Tue Aug 8 2017 High pressure will dominate the remainder of the day through tomorrow. High pressure will keep the weather quiet for the Midwest for the short term. in the low to mid 50s, well below climatological norms.
Additional showers are possible over far northern Minnesota and the Arrowhead late tonight when low pressure approaches from the west, and the elevated lifts north and east as a warm front. The low-level jet will be somewhat weak, but it could develop showers north of the elevated warm front. Overnight lows should be in the lower and middle 50s. This low will bring modest large-scale forcing for ascent across the Northland. Southerly flow ahead of the low will bring greater atmospheric moisture into the region, with precipitable water values increasing to about 1. Also, a lake breeze response to approaching low pressure will bring even cooler conditions to the Lake Superior shoreline.
209 PM CDT Tue Aug 8 2017 The area is under the edge of a weak upper ridge over Arizona and New Mexico with west to northwest flow aloft. Chances of rain decrease tonight and will mainly be present south of I-10 and across the higher terrain tomorrow. Temperatures increase tomorrow closer to normal values as the upper ridge becomes more centered over the region and winds return to the south.