Aikyam-Lab/Synoptic-Bench huggingface dataset:
525 AM MDT Fri Apr 17 2020 Satellite imagery shows a few mid and low level clouds with localized thicker clouds favoring the high elevations in some portions of the CWA. The low gets absorbed into the main flow and moves east allowing another chance of precipitaiton to move in starting Saturday morning. Freezing temperatures in the lower valleys of west-central Colorado remain the immediate concern this morning. Both GJT and MTJ have fallen below freezing already with AJZ not far behind. These areas will finally get a break from the cooler-than-normal lows as the warmer southwest air moves in raising temperatures by about 10 degrees in central and northern portions of the forecast area tonight and beyond.
230 PM CDT Fri Apr 17 2020 (Tonight and Saturday) Cold front has moved through the entire area, and much colder temperatures have taken hold. For tonight, we will see temperatures drop into the upper 30s well north of I-20 to the upper 40s along the I-10 corridor, as cooler air continues to filter in. 20 (Saturday Night through Next Friday) Southerly return flow should continue Saturday night as high pressure moves east.
Saturday, much warmer as a weak cold front veers surface winds to the northwest. Saturday night, cooler air will drop into the area.
403 PM EDT Fri Apr 17 2020 Low pressure currently southeast of Fort Wayne along the IN/OH border will continue to track east-northeast through Ohio this evening. A dry Saturday is forecast as high pressure builds over southern portions of the region.
The biggest change to the short term was to increase high temps a little bit in SE OK and across parts of NW AR where the cold front was slower to move through. Some recovery to temps could occur this afternoon in SE OK and NW AR after the cold front and associated rainfall exit.
With this low level forcing and the energy aloft, look for showers and isolated thunderstorms to develop and move east across the region by late tonight. Lows tonight ranging from the lower 60s far northern zones to the mid and upper 60s at the coast.
An upper-level trough stretches from IA and into KS. The ridge that has been over eastern CONUS the past couple of days is now centered downstream from the East Coast. Early morning GOES water vapor imagery showed zonal southern branch flow across the Midsouth, downstream of a northern branch trof dropping southeast through the northern plains. This trof and associated surface cold front will drop into the mid-MS River valley today, with the surface cold front eventually outrunning the positively-tilted upper trof by this evening. Low level return flow will commence in earnest Saturday night, in advance of an open southern branch trof.
338 PM CDT Fri Apr 17 2020 The main forecasting concern overnight will be the potential for widespread sub- freezing temperatures, which could lead to another frosty night across the Ozarks. Regional surface obs from early this afternoon depict a cold front extending from Indianapolis to Paducah to Fort Smith. Behind this front, a modified Canadian air mass is spreading across southwest Missouri as a robust mid-level trough digs across the mid-Mississippi valley. With the drier Canadian air mass settling in behind the front, temperatures overnight will consequently dip into the lower 30s. Scattered showers will develop across the Four States region as warm/moist isentropic ascent lifts over a warm front displaced well to our south.
We may see a few sprinkles during the morning hours as moisture advection increases in advance of the approaching upper level low.
The surface pressure gradient weakens early Saturday morning as upper trough and associated cold front move toward the region. Saturday our flow gradually turns cyclonic again as an upper trough connected to strong Hudson Bay low shifts moves into the Pacific NW. The associated cold front slips into our CWA from the north/northeast by early afternoon.
1217 PM CDT Fri Apr 17 2020 Dry weather continues, with warmer temperatures both today and tomorrow. This trough will slowly migrate southeast today, and height falls ahead of it together with low level theta_e advection and afternoon surface heating will lead to cloud development later today. On Saturday a cold front will pass through the region, but not before temperatures warm into the 60s for most locations.
1134 AM MDT Fri Apr 17 2020 Temperatures have increased above freezing across the Grand Valley, Central Gunnison and Uncompahgre River Basins. Satellite imagery shows a few mid and low level clouds with localized thicker clouds favoring the high elevations in some portions of the CWA. The low gets absorbed into the main flow and moves east allowing another chance of precipitation to move in starting Saturday morning. Freezing temperatures in the lower valleys of west-central Colorado remain the immediate concern this morning. Both GJT and MTJ have fallen below freezing already with AJZ not far behind. These areas will finally get a break from the cooler-than-normal lows as the warmer southwest air moves in raising temperatures by about 10 degrees in central and northern portions of the forecast area tonight and beyond.
Saturday still looks on target to be warmer and breezy day with winds of 20-30 mph and mostly sunny skies. As the mixing depth grows through the afternoon under a warm axis of 750-850mb air, the low- level wind field decreases. The highest low-level flow above the surface, 40-50 kts of wind aloft, will not be accessed due to morning stability. This warm advection is quite strong but rather dry, all ahead of the cold front moving in from the north of the evening. Saturday night a cold front will be pushing southeast across the county warning forecast area. Attendant with this mid-tropospheric trough will be a couple of areas of light precipitation.
Thoughts are that the low cloud coverage could linger a little later than anticipated, due to the northerly flow over saturated sfcs. With clearing overnight, temps are forecast to drop rapidly to below freezing in numerous locations. to the lower to middle 50s south of I-70.
Breezy conditions expected this afternoon at all sites ahead of a weak cold front. JB Chattanooga Airport, TN 51 66 47 65 53 / 80 10 20 80 90 Knoxville McGhee Tyson Airport, TN 49 63 43 66 51 / 90 20 10 80 90 Oak Ridge, TN 46 63 43 65 49 / 90 10 10 80 80 Tri Cities Airport, TN 46 60 37 66 48 / 90 30 10 70 90.
A freeze warning is in effect for tonight with conditions again dropping into the low 30s across the area.
Low temperatures across north central Oklahoma are expected to be near freezing. Otherwise, warmer temperatures are forecast on Saturday with a return to southerly winds. Southerly winds will become breezy across the west during the afternoon as a surface cyclone strengthens in the lee of the Rockies.
334 PM CDT Fri Apr 17 2020 A weak high pressure area was centered over eastern Kansas this afternoon and is expected to continue to slide to the southeast through this evening and overnight. With that said, we should be able to fall to or several degrees below freezing for several hours tonight, with temperatures becoming steady or warming slightly early tomorrow morning. Temperatures will begin to warm up starting Saturday with southwesterly low-level flow and short wave ridging aloft. There will still be some snow cover left in northern Missouri so while most of the forecast area climbs into the low to mid 60s, areas over the snow cover will be stuck in the 50s.
954 AM MDT Fri Apr 17 2020 Temperatures have increased above freezing across the Grand Valley, Central Gunnison and Uncompahgre River Basins. Satellite imagery shows a few mid and low level clouds with localized thicker clouds favoring the high elevations in some portions of the CWA. The low gets absorbed into the main flow and moves east allowing another chance of precipitation to move in starting Saturday morning. Freezing temperatures in the lower valleys of west-central Colorado remain the immediate concern this morning. Both GJT and MTJ have fallen below freezing already with AJZ not far behind. These areas will finally get a break from the cooler-than-normal lows as the warmer southwest air moves in raising temperatures by about 10 degrees in central and northern portions of the forecast area tonight and beyond.
Medium The core of high pressure will slowly shift south through the mid Mississippi Valley into the Ohio Valley this period. This will set up a tightening pressure gradient with a pronounced waa regime setting up as low pressure works east through Ontario and Quebec. Thermal ridge amplifies across srn WI on Saturday with 925 winds 35 to 40 knots.
Strong forcing from an upper level trough pushing into the area from the west was producing several bands of moderate snow. The highest snow amounts so far have been near 5 inches in our southern cwa. As the trough pushes to our east subsidence in the wake of the trough should allow for decreasing clouds in the afternoon. However, where the deepest snow cover exists temperatures may struggle to make the lower 40s. Tonight: High pressure will move into the area this evening then shift off to our east overnight. Saturday: Tight gradient with high pressure to our southeast and low pressure tracking along the United States/Canada border.
Otherwise, surface ridging drifts to the south overnight, and in a transitioning southwesterly low level flow it will be a milder night with lows in the lower to mid 30s.
316 PM CDT Fri Apr 17 2020 GOES visible satellite imagery this afternoon showed clearing skies and rapidly melting snow cover thanks to the high mid April sun angle. Saturday Much warmer to start the weekend with gusty southwest winds, between 30 to 40 mph, developing by the afternoon.
Upper level ridging will build over the region tonight through Saturday morning. High pressure at the surface over western Kansas today will move off to the east tonight. Skies will be clear under the ridge through this evening.
1238 PM CDT Fri Apr 17 2020 (Today and tonight) Strong cold front will continue to push south across the area this morning with gusty north winds and much cooler temperatures today. Most of the area will drop into the 30s with parts of northern Oklahoma falling to just above the freezing mark by Saturday morning.
255 PM MDT Fri Apr 17 2020 Quiet day across the Western Slope today in the wake of yesterday's cold front. Upper level flow will shift to the southwest this evening ahead of the next Pacific trough which will trek inland from southern California and across Arizona between midnight tonight and daybreak Saturday. Conditions will remain dry until mid Saturday morning when the aforementioned trough lifts across western Colorado. Even though this disturbance is set to move into the region within the next 24 to 36 hours, discrepancies still plague the models in terms of where the trough will be centered. Generally 1 to 3 inches of snow is forecast across the highest peaks along the Divide through Saturday night.
246 PM EDT Fri Apr 17 2020 Low pressure passes north of the area this evening, dragging a cold front through overnight. A low pressure system will pass north of the region this evening. The low will then drag a cold front through overnight with a wide band of showers. The air may get cold enough on the back edge of the precipitation to provide a changeover to snow in the higher elevations of the northern West Virginia mountains. A high pressure system will then build in on Saturday bringing an end to the precipitation and clearing skies. High pressure remains in the area Saturday night making for a dry start to the period.
239 PM EDT Fri Apr 17 2020 Dry weather will continue through this evening with high pressure east of the area.
High pressure aloft will weaken today. A weak upper trough will bring clouds, cooler temperatures, and a slight chance of showers on Saturday.
A low pressure system continues to slide across the area, with the area most favorable for afternoon showers and storms shifting to southern Nevada and northwest Arizona for Saturday.
As the cold front continues to move farther away, ceilings will continue to slowly rise with skies gradually clearing by this evening. The biggest change to the short term was to increase high temps a little bit in SE OK and across parts of NW AR where the cold front was slower to move through. Some recovery to temps could occur this afternoon in SE OK and NW AR after the cold front and associated rainfall exit.
254 PM EDT Fri Apr 17 2020 Currently - High pressure off the mid Atlantic coast, along with day time heating over Florida is resulting in light to gentle east to southeast breezes across the Keys and surrounding waters. Zonal flow is in place aloft with the lower level ridges situated near the Keys. The lower level ridge will remain near the Keys. The ridge will bubble back northward into the Keys as the low lifts out into the Atlantic later in the weekend. The lower level flow will firm up a bit out of the south, placing the Keys in Cuban shadow.
Low level cold advection in wake of departing mid level trough will be somewhat modest tonight and if clouds do persist through much of the night, areas with more expansive cloud cover may struggle to drop below the 30 degree mark.
BT Brief ridging will return throughout this morning, resulting in downsloping winds that will (alongside clear skies and good mixing) bring our temperatures up into the mid to upper 50s. It's associated cold front looks to pass through the area mid-Saturday morning, shifting winds to the north and northeast and following close behind it a surge of moisture.
Cold front as of 2 PM was making steady progress into the Hill Country ahead of temps roughly 20 degrees cooler. So while high temps will be stunted in the low-mid 70s on Saturday under thick stratus, soundings do show some elevated CAPE sufficient for thunder. Following a lull in lift behind tonight's front, a round of decent isentropic lift should arrive Saturday morning ahead of a subtle mid-level trough in WSW flow.
252 PM CDT Fri Apr 17 2020 Showers and isolated storms in a band from the KEVV tri-state into southern IL will continue southeast with a cold front through the early evening. Expanded the Advisory south with all areas dropping into the low to mid 30s.
1145 AM CDT Fri Apr 17 2020 Today marks the beginning of a warmer and generally dry stretch of days across the forecast area. Low level flow settles around to south-southwest tonight, and this along with overall warmer air mass should hold temperatures near to slightly above freezing in most areas tonight. Only other feature of note is an elongated upper trough currently extending from western SD into northern MN. Sub-cloud layer looks rather dry on forecast soundings, but cannot rule out a stray sprinkle east of the Highway 60 corridor in northwest Iowa/south central Minnesota this afternoon.
In wake of the strong cold front we have lowered temps for the rest of the afternoon by around 5 degrees in most areas. /issued 352 AM CDT Fri Apr 17 2020/ In the upper levels a flat ridge stretches across the southern tier of states with a cut off low along the CA coast. This low will track across AZ tonight and open up as it as it moves across NM Saturday.
Issued by National Weather Service Fort Worth TX 100 PM CDT Fri Apr 17 2020 /18Z TAFS/ Widespread MVFR cigs prevail this afternoon although there have been some temporary breaks in the low cloud cover mainly from Shreveport east into the Monroe area. A cold front is approaching from the northwest and will swing through TXK over the next couple of hours with a wind shift to the northwest.
As we move into the evening hours, clouds will continue to increase ahead of an approaching cold front. Saturday, while noticeably cooler than today, should remain rainfree.
148 PM MDT Fri Apr 17 2020 Latest upper air analysis shows a long wave trough moving over the Plains and Ohio River Valley, with another trough developing over the west coast. Satellite imagery shows clear sky over much of the Plains at the trough axis, with a large expanse over the Mississippi and Ohio River Valleys. At the surface a high pressure was moving over Eastern Kansas. With some WAA occurring, lows will be warmer than last night. In addition an upper level short wave trough will move over the southern half of the forecast area during the afternoon. (This almost seems like a scaled back version of the low CAPE high shear environment).
Tonight weak high pressure will be over the region, but a weakening cool front/weak upper level energy will be approaching from the northwest.
The overall cold pattern we've been in really begins to give way to a warmer pattern be this weekend. As mentioned in the previous section, we will be transitioning into a warmer weather regime.
High temperatures will run 5-10 degrees warmer than yesterday. Still tracking a low pressure system for late Sat/Sun which will bring some wind and higher elevation rain/snow.
323 PM CDT Fri Apr 17 2020 Light winds and clear skies associated with high pressure settling south will support another chilly night across the region. Left locations generally west of I-135 out of the freeze warning, as increasing boundary layer mixing should keep temperatures mostly above freezing. Increasing southerly flow and atmospheric thickness will support warmer temperatures Saturday into the 60s to near 70 degrees.
A line of showers will accompany a cold front this evening through early Saturday morning.
A weak cold front, currently across central Texas, will continue to push south tonight. Lowered temperatures several degrees, especially across the ranchlands, tonight as some slightly cooler air may filter into the area. The front is expected to move northward on Saturday before another weak cold front approaches from the north Saturday night.
941 AM MDT Fri Apr 17 2020 Have bumped up temperatures a bit for this afternoon as expected compressional warming along with a brief period of downslope winds prior to the arrival of cooler air will allow highs to reach the 60s in many locations. Warm and breezy conditions are expected today with compressional warming ahead of a cold front passage this afternoon. Post cold front passage expect the development of scattered showers, both rain and snow as temperatures drop overnight. Any snow accumulations will be minimal as overall most of the precipitation will be rain with low temperatures generally remaining above freezing.
At the surface, high pressure was centered over KS and a cold front had pushed into east TX and AR. Much of the guidance still shows temps falling to or a couple degrees below freezing. Think the potential for mixing and keeping temps above freezing is better across the western counties.
1213 PM CDT Fri Apr 17 2020 Early this morning, scattered showers with isolated embedded thunderstorms were located mainly along and directly behind a cold front extending from southeast Kansas and western Missouri into central Missouri. Colder air will be ushered in behind the cold front today as cloud cover and breezy northwesterly winds limit afternoon highs to the upper 40s to low 50s. The center of a high pressure system will then slide over the region by tonight into Saturday morning. After the cold start to the morning, Saturday will shape up to be a pleasant spring day as the high pressure slowly shifts to our east. This will lead to southerly winds, which will combine with ample sunshine to raise afternoon highs into the low to mid 60s.
At the surface, a strong cold front stretches from far southeast KS into central OK. Tonight/Sat morning we will again see temps very close to freezing, so it's not out of the question another freeze/frost headline will be needed. As high pressure settles over the region late this afternoon/early evening light and variable winds will result.
Passing sprinkles or flurries have been reported via mPING and certainly will remain possible with cross sections showing moisture and lift into the lower part of the dendritic layer. The weekend will be dry with sunshine and warmer weather with the exception for areas with lingering snow cover that will be a tad cooler.
Ahead of the frontal boundary moving across the northern plains this afternoon, southwest winds will increase and breezy conditions will likely develop along the lee side of the Buffalo Ridge tonight.
A Canadian cold front will move across the Continental Divide into northwest Montana Saturday morning. Breezy northeast winds will spread into northwest Montana as the cold front pushes across the divide Saturday.
Temperatures will be 10 to 15 degrees warmer and finally returning to near normal for the weekend.
239 PM MDT Fri Apr 17 2020 Gusty downslope winds have helped mix out the lower atmosphere, bringing surface temperatures up into the 60s for many locations. Very dry conditions in the lower atmosphere will make for some virga showers initially and then likely some light rain showers for a brief period before ending.
158 PM EDT Fri Apr 17 2020 Low pressure will track across the Ohio Valley today. Rain will become widespread this afternoon ahead of an associated cold front. A dry Saturday is forecast as high pressure builds into the region. The I-71 corridor will be next in line this early afternoon as the lower levels quickly saturate. As the gradient increases -- especially with the cold front passage late in the day into the early evening winds could gust up to 35 mph. With the low bisecting the area today expect a good gradient of temperatures. Highs to range from the lower 40s northwest to the lower 60s southeast.
947 PM EDT Fri Apr 17 2020 Low pressure bringing widespread precipitation will move east tonight as high pressure and dry air build from the west. A dry Saturday is forecast as the high settles over Kentucky.
A timelapse of GOES-16 visible satellite imagery shows snow leftover from the most recent winter storm melting rapidly as temperatures increased well above freezing today with plenty of sunshine.
For Saturday, a closed low now over Southern California will gradually weaken and move across Southern Colorado Saturday afternoon with some weak to moderate QG ascent with this system.
742 PM EDT Fri Apr 17 2020 Low pressure bringing widespread precipitation will move east tonight as high pressure and dry air build from the west. A dry Saturday is forecast as the high settles over Kentucky.
Cold front is just starting to work its way into the northwest, with strong northwesterly winds and temp drops showing up at Clarksville.
A cold front should be south and east of the Midsouth well before sunrise and clearing skies will move in from the West. /issued 405 PM CDT Fri Apr 17 2020/ Clouds are increasing across the region ahead of a cold front that currently stretches across southern IN and into eastern TX. Temperatures are in the low to mid 70s with relatively low humidity. We'll dry out pretty quickly by the afternoon as a weak ridge quickly moves east-northeast across eastern CONUS.
Additionally, patchy fog could develop and linger through early Saturday morning as winds diminish thanks to the approach of a weak cold front. A weak cold front, currently across central Texas, will continue to push south tonight. Lowered temperatures several degrees, especially across the ranchlands, tonight as some slightly cooler air may filter into the area. The front is expected to move northward on Saturday before another weak cold front approaches from the north Saturday night.
625 PM CDT Fri Apr 17 2020 A weak high pressure area was centered over eastern Kansas this afternoon and is expected to continue to slide to the southeast through this evening and overnight. With that said, we should be able to fall to or several degrees below freezing for several hours tonight, with temperatures becoming steady or warming slightly early tomorrow morning. Temperatures will begin to warm up starting Saturday with southwesterly low-level flow and short wave ridging aloft. There will still be some snow cover left in northern Missouri so while most of the forecast area climbs into the low to mid 60s, areas over the snow cover will be stuck in the 50s.