Aikyam-Lab/Synoptic-Bench huggingface dataset:
This should change as we get into early this morning across northeastern Kansas as that Fn strengthens and the lower levels of the atmosphere saturate. An isolated one inch amount will be possible generally along and west of the Highway 65 corridor where deep tropospheric lift will be maximized.
The aforementioned high will be unceremoniously shoved off to the east by this evening as the much advertised "Arctic Blast" cold front approaches the area.
In addition, the lower column remains quite dry with some t/td depressions exceeding 15-20 degrees during the predawn hours. High pressure will build over the area on Thursday and Thursday night with highs on Thursday 15-20 degrees below normal.
Stacked low pressure system over western Ontario still producing strong northwest winds to northeast Montana this morning. Winds are expected to ease slightly today before becoming light tonight as high pressure slides down the front range. Skies should clear to the west but position of the high will keep some clouds over the east. By Thursday night a slight upper ridge begins to develop over the state. The Canadian high pressure moves east and warmer air spreads across the divide.
Cooler temperatures and locally breezy north winds can be expected today with periods of high clouds. A weak cold front pushed through the region overnight bringing north winds to much of the area. Outside of the winds, temperatures will run a few degrees cooler today and we will see some high clouds during the day.
1123 AM CST Wed Dec 7 2016 We will remain under cyclonic flow owing to the large low pressure system departing to our northeast through the next 24 hours. The best chance of any accumulation will be tonight across mainly central MN through west central WI as a subtle secondary trough works through the area immersed in the parent deep cyclonic flow.
A vertically stacked area of low pressure will continue to move through the region this morning, and eventually translate to the east later today into tonight. Winds will slowly veer to the northwest through the day Wednesday as the low pressure moves away and should remain gusty as a tight sfc pressure gradient persists. Thanks to the cyclonic flow aloft, and cold temperatures in the low levels, scattered snow showers should remain over the Northland on Thursday morning.
We did see some slightly warmer temperatures this afternoon across the southern areas with highs making it into the lower 60s. played a key role in temperatures much cooler than expected. The stationary frontal boundary over the gulf waters never made it back as a warm front. a broad trough covered much of the interior part of the country. We do expect a strong cold front to arrive later tonight and sweep into the coastal waters by early Thursday morning. Much colder temperatures are on the way including a chance of showers in the vicinity of the cold front.
110 PM EST Wed Dec 7 2016 Low pressure north of the great lakes region will move northeast through tonight.
The increased cloud cover will lead to the high temps begin a few degrees cooler than expected. /Issued 335 AM EST Wed Dec 7 2016/ Short range models are in good agreement with a zonal flow aloft helping to hold a stalled cold front across far north GA today. A strong upper disturbance will push into the Ohio Valley late tonight and begin to push the cold front southward through Thursday. Behind the cold front. a very cold dome of high pressure will build southward and begin ushering in some of the coldest air felt so far this winter. Expect a breezy 15 to 20 mph NW while south of the cold front.
251 PM CST Wed Dec 7 2016 Tonight will mark the arrival of a strong cold front that will bring a modified arctic airmass down in the Lower Mississippi Valley.
411 PM EST Wed Dec 7 2016 Weak high pressure persists tonight.
343 PM EST Wed Dec 7 2016 As an upper level low pressure system moves eastward across southern Canada, arctic air will invade the region over the next few days.
1250 PM EST Wed Dec 7 2016 An approaching cold front will move through the forecast area Thursday.
Models show some fairly weak energy pivoting southeast into the area and combined with the evolution of some weak surface east/west troughing there is some potential for flurries or a few snow showers. POPS will be on the low side though with vry little showing up in the QPF department.
light freezing drizzle or snow flurries will be possible mainly at the Guymon and Amarillo TAF sites. Some very light freezing drizzle and flurries will be possible this morning across the central and eastern Oklahoma Panhandle and the far northeast Texas Panhandle initially behind the front. Some brief periods of flurries and very light freezing drizzle will be possible south of the Canadian River during the evening hours tonight, but flurries will be the main precip type after midnight as the cold air deepens across the southern Texas Panhandle.
316 PM EST Wed Dec 7 2016 An approaching cold front will move through the forecast area Thursday.
Strong Cold Front to Bring Sharply Colder Air Tonight. Partly to mostly cloudy skies are expected today ahead of an approaching cold front. High temps will be cooler than yesterday ranging through the 40s. Tonight a mainly dry cold front will pass through the region ushering in a much colder airmass.
1242 PM EST Wed Dec 7 2016 As upper level low pressure moves east across Ontario and Quebec, cooler and drier air will continue to move into the Ohio Valley today, with temperatures continuing to get colder through the end of the week.
115 PM EST Wed Dec 7 2016 Weak high pressure will settle over the Carolinas today. An arctic cold front will move through the area Thursday. High pressure will settle over the area today between a low departing tot he northeast and an arctic cold front moving through the Midwest. Skies will remain clear for most of the day in most areas, but some of the low-level moisture in the Coastal Plain may result in scattered cur this afternoon, while abundant moisture over SC will inevitably return north across the western Piedmont this evening as the flow veers to southerly ahead of the cold front.
1219 PM CST Wed Dec 7 2016 A deep upper level low currently over the MN/Ontario border is forecast to continue to track northeast while upstream, a broad upper level trough over the intermountain west and northern Rockies is forecast to dig into the nation's mid-section. The northern edge will quickly be eroded as dry high pressure builds southeast.
1153 AM EST Wed Dec 7 2016 Weak high pressure visits today.
221 PM EST Wed Dec 7 2016 Weak high pressure persists tonight.
A potent polar air mass will plunge into the base of a trough rotating through the northeastern U. Through the morning hours deep southwest flow will exist across the area as an upper level trough approaches. Flow remains favorable for northern Oneida County until around 09Z when the secondary trough drops through the region.
Ridging in the lower troposphere remains on an axis across the Florida Straits with deep moisture through 700 mb remaining.
323 PM CST Wed Dec 7 2016 An upper level low is currently located over the Great Lakes region this afternoon. An upper level trough and cold front is current pushing across the Plains. Dry air in the low levels has kept much of the area dry this afternoon, except for east central Kansas into west central Missouri where a band of snow was able to develop, with lingering light snow farther to the north. Lows will drop into the upper teens to the lower 20s tonight with highs not warming out of the 20s on Thursday. Lows Thursday night will drop well into the teens with single digits likely for some of the colder sites as the cold air mass and high pressure will be over the area.
The LAMP guidance is the preferred source for winds as it is the highest and matches observations the best.
309 PM CST Wed Dec 7 2016 Skies will clear tonight as arctic high pressure builds into the central plains from the northwest.
The next storm system and associated warm front is still expected to move in tomorrow with advisory level snowfall. Cold dry weather will continue today under northwest flow aloft with cold air at the surface left over from an upper level trough which has move east of the Rockies.
A cold front to our north will approach the area later today, and mid and high level clouds will filter in from the north. Then, as the cold front approaches northeast to north winds will increase and gradually back to the northwest with frontal passage between 04Z-06Z (10PM-1AM) tonight. Not much saturation is present for long in the low-levels, but may still see some light rain prior to the frontal passage this evening. Northwest winds will also increase especially over the higher elevations of northeast AL where wind speeds to 15-20 MPH winds will be possible. Temperatures will not rise much from Thursday morning with daytime highs forecast to be in the low 40s.
Rain chances will increase this evening as an arctic cold front moves into the ArkLaTex region. Any lingering fog will scour out by mid-morning, but as sfc winds veer to the east southeast /upslope component/, the low cloud cover will persist and subsequently, so will bouts of drizzle/light rain. This evening-tonight, a longwave trough will move from the Rockies onto the Plains and will send a breezy cold front across the region /15-20 mph especially across far east TX which is nearing Lake Wind Advisory criteria/.
1135 AM EST Wed Dec 7 2016 A strong low pressure system over southern Ontario will move slowly east across southeast Canada over the next couple of days causing cold conditions across our area.
322 PM CST Wed Dec 7 2016 As discussed in the late morning update, the high resolution models have been advertising a consistent signal of an area of light precipitation moving southeast across northern and eastern portions of the forecast area. Will keep some low pops in the east for the chance of drizzle, and with the wet bulb temperatures near or below zero in northern areas, the chance of freezing drizzle.
A weak cold front has passed through Central AL this morning, providing slightly cooler northerly flow to start off the day. Even though the mid and upper levels are dry, the lower levels are still saturated. Models are in good agreement with a dry cold front reaching the area early Thursday morning, but given the lack of moisture return in the mid and upper levels, precipitation amounts will be limited.
Expect lows tonight in the low to mid teens. Strong cold advection will continue into Thursday keeping temperatures cold with highs in the low to mid 20s. Thursday night the wind will subside as high pressure begins to build into the region.
Arctic high pressure overhead Thursday with cold temperatures continuing, highs struggle into the teens to around 20. Should see some afternoon sun, however the high pressure will result in lighter winds and the low Dec sun angle will limit mixing of the boundary layer.
Could also see periods of flurries throughout the day as very efficient atmosphere remains in place in the lowest several thousand feet.
Some light freezing drizzle may also be possible late this afternoon between U.
Pressure gradient between low pressure north of Lake Superior and high pressure expanding through the Plains resulting in the cold westerly flow across the area. Mid level cyclonic flow and low level thermal trough will keep the potential for MVFR cigs this period.
Main trough axis is shifting eastward into the Plains. leading edge of strong cold front moved through KAMA around 18z with strongest winds noted across the western half of the CWA. Can't rule out some light freezing drizzle before the profile cools to around minus ten degrees later tonight converting any precip to flurries.
A closed upper low sits over central Quebec with troughing extending through the Great Lakes region.
1111 AM CST Wed Dec 7 2016 The southern edge of the stratus associated with the upper low over southern Ontario continues to remain near our area this morning. NAM model soundings struggle to erode the low-level moist layer, and even if any clearing of the lower clouds occurs, mid-level cloud cover is spreading northeastward into NE IA and SW WI, so once again expect most areas to remain on the cloudy side with some flurries possible under lower cloud cover today.
Temperatures have stabilized and were beginning to edge slightly warmer, but remained below freezing. It's conceivable yet for freezing fog through about mid-morning, i. super-cooled droplets freezing upon contact, perhaps creating patchy icy conditions. Then, temperatures should rise above freezing and whatever fog is around will lift. Low level flow will veer to the west and scour this low level moisture mostly if not entirely off of the Caprock by midday but low clouds may persist longer, even all day, over portions of the Rolling Plains.
Those regions also stayed much warmer last overnight with temps currently near forecast max.
1256 PM CST Wed Dec 7 2016 Visibility remains the lowest over the Devils Lake basin/western fa where where winds remain the strongest. This low will continue to track slowly eastward. Forecast will remain in the windy zone west of the low as mixing up through 900 mb should continue where winds are 40-45 kt range. Moisture is still wrapping around the low and mostly into the northeastern half of the fcst area. Overall though lack of intense snow in the high wind area is allowing for improving visibilities to just above blizzard range in most areas and to match up with WFO BIS will expire blizzard warning at 12z.
Will be keeping IFR/MVFR CIGS in for most sites through the rest of the afternoon/evening hours ahead of the cold front. The cold front is still on track to push through SE Texas tomorrow AM. This will likely mean the highest temperatures will be in the morning with temperatures slowly falling through the day.
/issued Issued by National Weather Service Shreveport LA/ Water vapor imagery shows a broad trough of low pressure over the continental US this morning, with an approaching disturbance moving through the southwesterly flow aloft.
252 PM CST Wed Dec 7 2016 Sprawling ridge of high pressure extending from western Canada to the Ohio River Valley will dominate the weather across central Illinois for the next 24 hours. W/NW winds around the periphery of the high will continue to bring colder air into the region, allowing lows to drop into the teens and lower 20s. an upper trough currently over the Upper Midwest will pivot southeastward into central Illinois by Thursday afternoon.
Many areas of western Montana and Lemhi county Idaho will be sub-zero for temperatures, with much of central Idaho in the low teens and single digits. Weak high pressure will support stable and cold conditions most of Thursday.
305 PM CST Wed Dec 7 2016 Cold front is currently positioned up across the midwest and stretches from just nw of Chicago to srn KN. Meanwhile, at the time of the fropa, very weak mid level troughing will be in place with the axis located upstream. Clearly, models show the higher moisture levels across the south.
Issued by National Weather Service Shreveport LA 1026 AM CST Wed Dec 7 2016 Water vapor imagery shows a broad trough of low pressure over the continental US this morning, with an approaching disturbance moving through the southwesterly flow aloft.
Tonight Through Thursday Cold high pressure will be over western and central Wyoming tonight and Thursday morning.
Flow aloft remains rather quick in longwave troughing with deep upper low over southwestern Ontario and another weaker wave making its way east into Wyoming and Colorado early this morning.
1247 PM EST Wed Dec 7 2016 Flow around a deep low pressure system north of Michigan continues to push cold air into the Northern United States.
These bands should continue to intensify, especially as the trough moves into the western lake. As the trough continues to settle south across the area this evening and tonight, a burst of heavy snow will accompany that trough and be the beginning of NW wind LES that will continue through late-week. Nam shows a 500 mb trough over the upper Great Lakes 12z Thu. Troughing remains through 12z Sat over the area. with a broad trough across most of the country 12z Sat. Troughing continues over the area Mon into Tue with cold air remaining over the area through then.
The Freeze Warning has been allowed to expire as most locations are above freezing now.
308 PM EST Wed Dec 7 2016 Weak high pressure extends into the area tonight.
High pressure will continue to build in through the evening with surface winds increasing to near 20 knots from the NE with higher gusts. expect a few snow flurries with also the chance of some very light freezing drizzle. Highs tomorrow struggling to reach the freezing mark on the Caprock. and a few degrees warmer in the SE Panhandle and Rolling Plains in the mid 30s. James Tomorrow's stubborn low clouds should undergo steady erosion and thinning by Thursday night as cold surface ridging departs the region.
All-in-all it should be a pleasant day with light winds, drier air, and high temperatures from the lower 70s north to near 80 south.
1149 AM EST Wed Dec 7 2016 An approaching cold front will move through the forecast area Thursday.
A cold front is forecast to move through the area during the overnight hours and bring the chance for light rain with slight visibility restrictions, mainly between 09Z and 15Z tomorrow.
/Issued 316 PM EDT SUN AUG 28 2016/ High pressure across New England will move offshore today while a tropical system, once Fiona but now TD Eight, will continue to trek closer to the Carolina Coast. However, have noted some low/mid level moisture across the higher elevations on soundings along with a weak mid-level impulse. But if clouds do not materialize and enough moisture gets trapped in the lowest levels, fog could then develop. Lows around 70, apart from the cooler temperatures across the higher terrain. Highs in the low/mid 90s, with the higher terrain in the mid/upper 80s.
1130 PM EDT SUN AUG 28 2016 A weak cold front will sag slowly south tonight and Monday morning.
708 PM CDT SUN AUG 28 2016 Thunderstorms again developing this afternoon across the region, with the highest coverage over northwest MO where a subtle boundary has been lifting north and interacting with a weak wave over central NE.
736 PM EDT SUN AUG 28 2016 A cold front will approach Maine and New Hampshire tonight and move off the coast early monday morning.
1152 PM CDT SUN AUG 28 2016 Thunderstorms again developing this afternoon across the region, with the highest coverage over northwest MO where a subtle boundary has been lifting north and interacting with a weak wave over central NE.
High pressure shifting from northern lower Michigan to Lake Huron will line up to direct some marine moisture inland. Highs will hover just above average values for the date in the low 80s.
730 PM EDT SUN AUG 28 2016 A weak cold front will sag slowly south tonight and Monday morning.
718 PM EDT SUN AUG 28 2016 High pressure over northern lower Michigan will bring clear sky to the terminals during the evening other than some cirrus debris from storms to the south. The high will continue to strengthen as it drifts over Lake Huron tonight into a position favorable for directing some marine moisture inland. Highs will hover just above average values for the date in the low 80s.
945 PM EDT SUN AUG 28 2016 Deep easterly flow will continue across the region between ridge extending along the eastern seaboard and newly formed Tropical Depression 9 (formerly Invest 99L) in the Florida Straights. Easterly winds up to 10-15 knots will persist over the waters between ridge to the north and newly formed Tropical Depression 9 in the Florida Straights.
1020 PM CDT SUN AUG 28 2016 Nearly stationary upper low over Galveston Bay has continued to drive convection across the southern half of our region for much of the early evening.
827 PM CDT SUN AUG 28 2016 Surface warm front extending into west central MN will continue lifting north as a cold front approaches from the eastern Dakotas. Prior to the frontal passage, highs will warm into the low/mid 80s.
633 PM CDT SUN AUG 28 2016 Water vapor satellite this afternoon shows an upper level ridge along the East Coast into the Great Lakes Region.
Chattanooga Airport, TN 72 94 70 93 / 10 20 10 10 Knoxville McGhee Tyson Airport, TN 70 94 68 92 / 10 20 10 10 Oak Ridge, TN 71 94 70 93 / 10 20 10 10 Tri Cities Airport, TN 64 92 64 91 / 10 20 10 20.
(Issued 229 PM CDT SUN AUG 28 2016) Broad high pressure remains anchored over the D. region this afternoon with a convergence boundary/upper disturbance evident along the higher terrain of the Appalachians. This dry air along with the building high pressure and weak subsidence could keep the region mostly dry.
winds are east to southeast ranging from 16 knots at Long Key Light to near n area of low pressure is located just north of the north central coast of Cuba, with a weak region of high pressure well north of our region.
Will see some cooler nights Tue night through Thu night. Looks dry until later Sat at the earliest, maybe even until late Sunday, when a low pressure system will trek northwest of the CWA and bring a cold front in. Scattered showers/t-storms may also develop at IWD/CMX late tonight into Monday morning with increasing warm advection ahead of approaching trough over the Northern Plains so have included VCSH in IWD and CMX TAFs. If stronger winds do occur, Tue/Wed would be the time frame as a high pres ridge builds toward the area in the wake of cold front passage Mon night/early Tue morning.
1126 PM CDT SUN AUG 28 2016 The short term will continue to be dominated by a strong high pressure system which will be retrogressing slowly west from the East Coast. Temperatures will remain slightly above normal through the period with highs generally from near 90 to the lower half of the 90s and surface dew points hanging in the lower to mid 70s.
Certainly cannot rule out the ern areas getting a little bit more rainfall before the overnight hrs begin, as weak upper disturbances continue to traverse wwd underneath a broad upper ridge pattern over the Mid Atlantic/OH Valley states. Relatively quiet wx conditions should then prevail going into the early morning period, as cloud cover diminishes and temps lower predom into the lower 70s range for most locations. 09 (Issued 229 PM CDT SUN AUG 28 2016) Broad high pressure remains anchored over the D. region this afternoon with a convergence boundary/upper disturbance evident along the higher terrain of the Appalachians. This dry air along with the building high pressure and weak subsidence could keep the region mostly dry.
802 PM EDT SUN AUG 28 2016 A weak cold front will sag slowly south tonight and Monday morning.
1057 PM CDT SUN AUG 28 2016 Surface warm front extending into west central MN will continue lifting north as a cold front approaches from the eastern Dakotas. Prior to the frontal passage, highs will warm into the low/mid 80s.
955 PM EDT SUN AUG 28 2016 A weak cold front will sag slowly south tonight and Monday morning.
The dry cold front has passed through the area. Templer Previous Discussion - Synoptic Setup: A cool trough begins over the Northwest Territories and runs down through Alberta and Southern Saskatchewan where it fizzles out into zonal flow across Montana. Hot high pressure has developed over Nevada and is slowly spreading north into Idaho in the form of a ridge. This afternoon through tonight, cold front will continue moving though the area this afternoon cooling off the region with stable high pressure overnight.
Upper level low across the Upper Texas Coast continues to slowly drift westward towards the region. VCT remains in closer proximity of upper low, and will continue to mention VCSH over night though where better chances remain during this time. Upper low across the Upper Texas Coast and southwest Louisiana will continue to slowly approach the area tonight into Monday.