Aikyam-Lab/Synoptic-Bench huggingface dataset:
With the winds becoming light, combined with clear skies and good radiational cooling expect temps to fall to near to below freezing across nearly the entire forecast area tonight. With the majority of the coastal zones seeing temps below freezing temps for the first time this season, a freeze warning continues to be in effect for tonight for the these zones. Elsewhere below freezing temps are expected interior zones, but this is not the first such occurrence this season further inland.
Winds will become light/southeast by midday Saturday as the ridge moves off to our east.
510 PM CST Fri Dec 9 2016 Ridge of high pressure extending from Saskatchewan southeastward into the lower Mississippi River Valley continues to shift slowly eastward this afternoon. While forecast soundings suggest the low clouds will gradually erode this evening, they maintain a mid/high overcast through tonight into Saturday. Once the ridge axis pushes further east, low/mid-level WAA will commence Saturday afternoon.
Clouds overnight and increasing winds tomorrow morning will keep temperatures several degrees warmer than the last few mornings. Pressure gradient over the Plains will tighten as lee troughing develops and begins to deepen across the High Plains.
Some veering of winds will occur on Saturday as the high shifts farther east, allowing a more E/SE component with speeds ranging from 5-10 kts.
High pressure. Chattanooga Airport, TN 22 44 28 51 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 19 40 25 50 / 0 0 0 10 Oak Ridge, TN 19 41 25 49 / 0 0 0 10 Tri Cities Airport, TN 17 38 21 46 / 0 0 0 0.
705 PM EST Fri Dec 9 2016 Building high pressure will keep temperatures below normal tonight into Saturday.
Surface winds will continue northerly as the center of cold high pressure hangs back towards the Ohio and Tennessee valleys. However, drier air in the low-mid levels should inhibit much Atlantic stratocumulus from pushing ashore except along the Treasure Coast, where a scattering of showers noted just offshore has been slowly diminishing. Winds may decrease to 15 knots in the north on Saturday due to the formation of a weak coastal trough but choppy short period waves will necessitate an exercise caution statement.
The highest sustained winds have been near 25 knots at the marine observation platforms. Temperatures are in the lower 70s, with dewpoints in the mid 60s. High pressure centered over the Ohio River Valley will slide southeast overnight. The tightened pressure gradient between the high to our north and the front stalled to our south will support continued strong breezes.
Cold temperatures continue to hold on around the region with high pressure moving in behind yesterday's cold front. Temperatures this afternoon are struggling to get above freezing, and with continuing clear skies overnight, it looks like most of the mid state will see teens for lows by Saturday morning.
The high is progged to continue settling southeast into the Mid MS River valley tonight, with a continued gradual relaxation of the pressure gradient over the inland forecast area. With all of this in mind, have issued a freeze warning for tonight for all but Jefferson County and Cameron Parish, on the basis of a first light freeze for the I-10 corridor, and a prolonged period of freezing temperatures between 25 and 30 degrees over interior East TX and Central LA generally along and north of the Hwy 190 corridor.
930 PM EST Fri Dec 9 2016 Building high pressure will keep temperatures below normal tonight into Saturday.
615 PM CST Fri Dec 9 2016 As high pressure settles over SE TX/S LA, winds offshore continue to diminish this evening. The high is progged to continue settling southeast into the Mid MS River valley tonight, with a continued gradual relaxation of the pressure gradient over the inland forecast area. With all of this in mind, have issued a freeze warning for tonight for all but Jefferson County and Cameron Parish, on the basis of a first light freeze for the I-10 corridor, and a prolonged period of freezing temperatures between 25 and 30 degrees over interior East TX and Central LA generally along and north of the Hwy 190 corridor.
652 PM EST Fri Dec 9 2016 A broad and very cold upper level trough over the Great Lakes and southeastern Canada will remain in place for the next few days. This weather feature and a well-aligned westerly low level flow off the lower Great Lakes will bring a prolonged period of lake effect snowfall and significant snow accumulations to northwest PA today through Saturday. High pressure will briefly build across the commonwealth late Saturday and Saturday night causing the Lake Effect snow bands to lift north of the region with a brief period of clearing elsewhere.
18Z surface data has high pressure from the Dakotas into the lower Mississippi Valley while a storm system was developing in the Rockies. Quiet and dry conditions will be seen late this afternoon and tonight as high pressure moves through the area. Dry conditions will continue Saturday morning as high pressure moves into the Great Lakes and the storm system approaches from the Plains.
755 PM EST Fri Dec 9 2016 Arctic high pressure will build across the area through Saturday.
Temperatures are on track reach forecasted lows ranging from the lower 20s in urban areas and near large bodies of water, to the m/u teens elsewhere. The axis of a low level ridge will shift eastward, with southerly flow returning and 850 temps warming a few degrees. Thus, expect highs to quickly warm above freezing by 9 am and then into lower 40s during the afternoon.
544 PM CST Fri Dec 9 2016 This afternoon the Arctic High that has been the "Star Of The Show" all week was centered over Saskatchewan with its attendant ridge punching SE all the way to the Gulf Coast. As expected, the semi- inverted ridge is shifting slowly east as a compact surface cyclone develops over Northeast NM. The clouds are winning, as temperatures across KICT Country are in the 25-30F range whereas in Southwest KS and the Panhandles where skies have cleared the mercury has soared into the lower 40s.
939 PM CST Fri Dec 9 2016 The low clouds were able to clear out of western portions of the FA late this afternoon and evening before the high clouds moved over the area.
the deterministic NAM/GFS predict a coastal trough to develop Tonight/Saturday. Low temps early Saturday in the upper 30s/mid 40s with highs Saturday in the lower 50s/near 60 (warmer max temps than Today owing to airmass modification yet still somewhat cooler given cloud cover.
Generally looking at a mix of MVFR and VFR cigs tonight, with all areas seeing MVFR cigs on Saturday as a low pressure system moves in.
Arctic high pressure centered near Minot this Friday evening will drift southeast to western Minnesota by Saturday morning. Lee side cyclogenesis across the high plains of Montana and Wyoming tonight will then appear as low pressure which tracks across South Dakota during the day Saturday into Saturday night. The high pressure are will also keep skies clear over all but far western North Dakota this evening allowing temperatures to fall into the mid 20s below zero north central to 10 to 20 below elsewhere. Arctic high pressure was centered over southern Saskatchewan, with its axis extending southeastward across ND into eastern SD and southern MN. Light winds near the high center and southeast winds of 5 to 10 mph developing in the southwest will still produce wind chill values in the 25 to 40 below zero range.
The upper pattern this evening is defined by a broad ridge of high pressure over the Eastern Pacific, an upper low spinning in the Gulf of Alaska, and a broad trough of low pressure across the eastern half of the country. Southeast Arizona is positioned on the eastern periphery of the upper ridge with a generally westerly zonal flow aloft. with low temperatures generally in the low to mid 40s in the lower deserts from Tucson west. After the clouds depart, Saturday afternoon should be mostly sunny with temperatures a few degrees warmer in most areas and perhaps 10 degrees warmer over those eastern areas that are struggling today.
The foothills will see 3 to 4 with the high mountains getting up to 6 to 10. Through the day tomorrow, warmer west winds will begin to shift east towards Billings.
908 PM EST Fri Dec 9 2016 High pressure to the Northwest this evening, will slowly move more toward the North Overnight. The lower level flow will gradually transition from Northerly to North/Northeasterly Overnight. The combination of the flow becoming more onshore, and the high cloud cover will keep temperature readings a little more elevated from KGNV to KJAX and South. Further North and West, mainly clear skies and flow mainly over land will result in temperatures dipping to below freezing. A few locations to the Southeast of the freeze warning area could reach freezing Overnight, such as KVQQ, but the coverage and duration will be less there than in the warned area.
1012 PM EST Fri Dec 9 2016 In the mean the next 8 days will be dominated by an upper level trough.
1004 PM EST Fri Dec 9 2016 A broad and very cold upper level trough over the Great Lakes and southeastern Canada will remain in place for the next few days. This weather feature and a well-aligned westerly low level flow off the lower Great Lakes will bring a prolonged period of lake effect snowfall and significant snow accumulations to northwest PA today through Saturday. High pressure will briefly build across the commonwealth late Saturday and Saturday night causing the Lake Effect snow bands to lift north of the region with a brief period of clearing elsewhere.
/issued 302 PM CST Fri Dec 9 2016/ SHORT TERM (Tonight through Saturday Night): Moderate to breezy north to northwest winds and cloudy skies prevail across Deep South Texas this afternoon as relatively shallow, cool high pressure prevails over the area. Low temperatures tonight will remain generally in the low to mid 40s, with a few upper 30s possible across the ranchlands, under cloudy skies. The development of a coastal trough Saturday into Saturday night and increasing moisture should support isolated to scattered showers near the coast.
459 PM MST Fri Dec 9 2016 Afternoon water vapor imagery depicted an active large scale near- zonal flow across the Lower 48. A deep cyclone was slowly tracking east toward the British Columbia coast. Areas closer to Cheyenne were in the low/mid 40s thanks to gusty downsloping west winds. Gradients/lee-side trough position not as favorable for Bordeaux than it is for Arlington/Elk Mountain. The higher west facing slopes could measure up to 2 feet. Lows Sat night outside the mountains will range from the teens north of I-80 to the low/mid 20s south. Pacific front swings through the CWA Sun with high temperatures 5-10 degrees cooler.
341 PM MST Fri Dec 9 2016 Downsloping over much of the metro area has allowed temperatures to get into the lower 50s this afternoon. The low level winds should adhere to pretty normal drainage patterns overnight, with a downslope component to the surface winds on Saturday. By Saturday, will increasing them again by late morning, with near 100%s in the high mountains after 21Z Saturday afternoon. By later Saturday afternoon, the moisture is deep, there is synoptic scale energy and decent orographic enhancement in the high mountain zones. For temperatures, Saturday highs are 1-4 C warmer than this afternoon's.
625 PM EST Fri Dec 9 2016 Cold high pressure will build into the area through Saturday.
312 PM MST Fri Dec 9 2016 Afternoon water vapor imagery depicted an active large scale near- zonal flow across the Lower 48. A deep cyclone was slowly tracking east toward the British Columbia coast. Areas closer to Cheyenne were in the low/mid 40s thanks to gusty downsloping west winds. Gradients/lee-side trough position not as favorable for Bordeaux than it is for Arlington/Elk Mountain. The higher west facing slopes could measure up to 2 feet. Lows Sat night outside the mountains will range from the teens north of I-80 to the low/mid 20s south. Pacific front swings through the CWA Sun with high temperatures 5-10 degrees cooler.
Freezing rain has been much slower to end than previously expected as the low level cold air refuses to budge from northwest Ada County and the Lower Treasure Valley. Issued a winter weather advisory for freezing rain for the Upper Treasure Valley - valid until 12Z. Freezing rain accumulations on trees and power lines may be a problem overnight. MVFR/IFR conditions in mountain snow and valley freezing rain this evening. At KEUL and KBOI, temperatures are now expected to remain around freezing and will likely remain that way through Saturday morning.
Today should mark the beginning of a nice warm up across the area, with highs still expected to max out in the low to mid 60s across the area. A ridge of high pressure will bring continued warm and dry weather to eastern Kentucky today and tonight. Cloud cover will begin to increase from the southwest towards dawn tomorrow, and we will finally see precipitation chances return, as an area of low pressure approaches the area from the southwest. Temperatures should be well above normal both today and tomorrow, with highs in the low to mid 60s expected today, and ranging from the mid 50s to lower 60s on Saturday. Tonights lows are forecast to bottom out in the lower 40s.
548 AM CST Fri Feb 17 2017 A temporary rex block will continue over the Plains into the weekend with a cutoff cyclone moving slowly across the Gulf Coast and an upper-level ridge over the central and northern Plains. Along and ahead of the trough the surface to 850 mb flow will turn southwest allowing for good mixing within the 850 mb thermal ridge. This should allow for highs today to be 3 to 6 degrees warmer than we saw on Thu with record highs likely at KOMA/KLNK.
A weak ridge of high pressure will build into the region early this afternoon. a weak warm front will approach the region tonight and Saturday.
Dry with warmer conditions are expected for one more day today. Then a strong Pacific storm system will bring a very good chance of valley rain, mountain snow, cooler temperatures and gusty winds this weekend. A ridge of high pressure aloft will result in another day of near or slightly above normal high temperatures today. This ridge of high pressure will shift east late Friday as a storm system enters the central California coast.
653 AM CST Fri Feb 17 2017 Fairly quiet and mild weather expected today and Saturday as closed mid-level low over Permian Basin lifts northeast, allowing light winds and a mostly clear sky to prevail while brief ridging sets up tonight and Saturday.
An associated warm front will lift northward across the forecast area later today bringing another round of precipitation through Saturday morning. Mild temperatures expected through Saturday should continue snowmelt for the lower valleys.
608 AM EST Fri Feb 17 2017 Low pressure will continue to move through the gulf of Saint Lawrence today. High pressure will briefly build across the region tonight.
932 AM EST Fri Feb 17 2017 High pressure will slide offshore of the southeastern United States coastline through today.
903 AM EST Fri Feb 17 2017 High pressure approaches from the west today and moves across the area tonight.
A large upper level southern stream trough will lift out of Texas tonight and cross the southern Mississippi River Valley on Saturday. At the surface, a broad area of showers and thunderstorms will develop ahead of this trough in the western Gulf of Mexico this afternoon, and cross into the eastern Gulf waters by Saturday morning. The highest rain chances will generally be from Tampa Bay north.
Skies are mostly cloudy over the Lower Keys and mostly sunny over the Middle and Upper Keys. In the low levels of the atmosphere, an area of high pressure over the Florida peninsula will move eastward into the southwest Atlantic Ocean this afternoon. In the mid levels of the atmosphere, a ridge of high pressure will be located over the eastern Gulf of Mexico today. In the upper levels of the atmosphere, a ridge of high pressure will be centered over the Florida peninsula this afternoon.
632 AM EST Fri Feb 17 2017 VFR conditions will continue throughout the TAF cycle with a ridge of high pressure in place.
A low pressure system will move through California the next couple days.
900 AM EST Fri Feb 17 2017 The Tallahassee airport and a few other inland locations reported freezing temperatures this morning. After a cool start, we will warm up into the lower 70s this afternoon. Deep layer ridging over the northeastern Gulf this morning will push eastward through the day as an upper level cut off low moves through the southern Plains and towards the lower Mississippi valley. As the upper level low moves closer, we'll also see an increase in upper level cloudiness in the afternoon. Highs will be in the low 70s.
602 AM EST Fri Feb 17 2017 Warm front lifting north early today. Warm front lifting through this morning. Generally looking at 50s to low 60s across the lowlands today with S to SW flow.
Low temperatures were in the 65 to 69 degrees across the Lower and Middle Keys and in the lower 60s across the Upper Keys. A low level high pressure located this morning over the Florida panhandle will enter the western Atlantic waters later today and tonight. Its western ridge will extend to the Keys through Saturday morning, keeping light winds.
555 AM EST Fri Feb 17 2017 High pressure will move offshore today and remain centered to the southeast of the region through Saturday.
411 AM CST Fri Feb 17 2017 A mostly dry closed low was currently spinning over the area and will continue to move to the northeast today. The only effect from this low will be continued mid level cloudiness over the Rolling Plains this morning. Despite the lower heights from this low, thickness values will be on the increase today leading to warmer temperatures. Warming will be boosted by westerly downsloping winds as surface lee troughing continues for this afternoon.
643 AM EST Fri Feb 17 2017 A warm front will move north through the area today bringing well above normal temperatures to the region with record high temperatures possible heading into the weekend. Temperatures today will be on average 20 degrees warmer than yesterday.
522 AM CST Fri Feb 17 2017 At H5 large ridge over the central CONUS. Trough moving into west Texas underneath the ridge. Several weaker waves moving through the Pacific Northwest and very large mature closed low over the Canadian Maritimes with resultant trough off the Atlantic Coast. High pressure remains over the region through the weekend resulting in dry weather and warm temperatures across north central Nebraska.
644 AM EST Fri Feb 17 2017 High pressure will bring clearing skies today along with seasonal temperatures. Warming 850mb temperatures along with surface ridging will erode this cloud deck from southwest to northeast this morning. Tonight, a flat upper level ridge builds over the region as high pressure moves to the east coast.
Dew points have increased a tad early this morning but should flatline in the mid 30s and then drop into the lower 30s per mixing current soundings, with minimum humidity falling out near 35 percent. High temps will soar into the low 60s after a warm front surges north this morning.
An upper low. This low is tapping into abundant atmospheric moisture that extends well west of the Hawaiian Islands. Very strong winds will be present as the upper low shifts closer to the central coast and the surface pressure gradients strengthen. The upper low will move onshore near the San Francisco Bay area late tonight into early Saturday morning.
Some rain is on tap for Saturday, but it shouldn't be a washout for anyone, though it will be cooler than today. Mid/upper low set to drop into the MS river valley late tonight/ Saturday.
1008 AM EST Fri Feb 17 2017 High pressure will build across the area through tonight.
854 AM EST Fri Feb 17 2017 A warm front will lift north across the region today.
915 AM EST Fri Feb 17 2017 High pressure will drift off the Southeast U. coast and allow a warm front to lift north across the southern Mid Atlantic states today and tonight. An upper level trough will cross the region late Saturday and Saturday night. Mid and high cloudiness over the region this morning is a result of a potent vorticity maximum diving SE into the base of the offshore- moving deep mid level longwave trough.
High temps will soar into the low 60s after a warm front surges north this morning.
845 AM EST Fri Feb 17 2017 Low pressure will continue to move through the Gulf of Saint Lawrence today. High pressure will briefly build across the region tonight.
610 AM EST Fri Feb 17 2017 High pressure will build across the southeastern states today.
The low cigs are expected to arrive around 05-06Z at KACT and 06-07Z in the DFW Metroplex and are expected to clear before midday as dry air wraps around a departing upper level low. /ISSUED 341 AM CST Fri Feb 17 2017/ A split flow pattern persists across the Central CONUS today with a southern stream upper low over West-Central TX and a ridge over the Upper Mississippi Valley. Light RADAR echoes are occasionally popping up just west of the forecast area in the vicinity of the upper low center. As the upper low heads east Saturday, a larger and deeper upper level trough will be digging southeast across Northern Mexico.
619 AM EST Fri Feb 17 2017 High pressure will build in from the west today and will crest over the region tonight as a warm front lifts into the northeast. The warm front will quickly be followed by a cold front on Saturday afternoon.
627 AM EST Fri Feb 17 2017 High pressure will build across the area through tonight, then a storm system will affect the area Saturday and Saturday night.
A closed upper low will lift NE over the state by Sat. given the low coverage potential. What rain chances that are forecast will decrease by the end of the period as the closed upper low moves out of the region Sat night.
/issued 411 AM CST Fri Feb 17 2017/ A mostly dry closed low was currently spinning over the area and will continue to move to the northeast today. The only effect from this low will be continued mid level cloudiness over the Rolling Plains this morning. Despite the lower heights from this low, thickness values will be on the increase today leading to warmer temperatures. Warming will be boosted by westerly downsloping winds as surface lee troughing continues for this afternoon.
640 AM EST Fri Feb 17 2017 A warm front will lift north across the region today.
941 AM EST Fri Feb 17 2017 High pressure will build across the southeastern states today.
A southern stream upper low will eject northeast from the southern Plains later tonight and Saturday.
620 AM EST Fri Feb 17 2017 A warm front will move northeast into the Great Lakes today bringing an unseasonably warm airmass into our area. A weak cold front will move into the area Saturday, but any cooling associated with this feature should be limited to areas near Lake Michigan.
Upper level low is over the TX panhandle / wrn OK region, and upper level difluence ahead of the low is helping to drive an area of showers over ern TX and wrn LA. A closed upper low will lift NE over the state by Sat. given the low coverage potential. What rain chances that are forecast will decrease by the end of the period as the closed upper low moves out of the region Sat night.
950 AM EST Fri Feb 17 2017 High pressure across north Florida this morning will shift eastward across the Atlantic by late afternoon. though slightly cooler along the Volusia coast in the lower 70s.
All in all soundings are bone dry with mid level ridging dominating.
634 AM EST Fri Feb 17 2017 A warm front will move north through the area today bringing well above normal temperatures to the region with record high temperatures possible heading into the weekend. Temperatures today will be on average 20 degrees warmer than yesterday.