Aikyam-Lab/Synoptic-Bench huggingface dataset:
Will drop forecast lows in that area to the upper 20s/near 30, while the rest of the area will continue to have forecast lows mainly in the lower to mid 30s. High clouds should remain quite thin overnight, but thicken after daybreak ahead of an approaching trough/front. After sunset tomorrow evening rain will move into the region ahead of a cold front. McD Chattanooga Airport, TN 60 45 51 28 51 / 20 80 10 0 0 Knoxville McGhee Tyson Airport, TN 60 43 48 25 47 / 30 80 30 0 0 Oak Ridge, TN 57 42 48 24 47 / 50 80 20 0 0 Tri Cities Airport, TN 56 41 45 21 43 / 20 80 30 0 0.
An upper ridge will build over the area through Sunday for dry conditions and mostly clear skies. Dry conditions continue through Sunday night with a ridge developing over the forecast area. Temperatures will mostly warm on Sunday, though an inversion over the Treasure Valley will keep temperatures on the cooler side for Sunday.
This evening zonal flow aloft will transition to more northwesterly as troughing deepens to the north of the area. As this occurs the systems attendant cold front will approach the area.
1020 PM MST Sat Nov 20 2021 The midlevel trough and associated cold front currently bisect the forecast area from west to east. Lift focused along the front is supporting a band of showers, which may produce a quick burst of snow in the higher elevations. The highest snowfall totals still look to be the northern and central mountains. With the new air mass and less clouds lows tonight should run 5-10 degrees cooler than this morning. Northerly flow behind the trough will usher in drier air tomorrow putting an end to any lingering snow/clouds. Highs will run roughly 5 degrees cooler than today, although expect mostly sunny skies.
1042 PM CST Sat Nov 20 2021 A short wave trough was moving across South Dakota early this afternoon and will continue to zip east and past the area this evening only to be quickly followed by another short wave trough overnight. Forecast soundings across northeast Iowa show a pretty large area of dry air in the low levels such that if any precipitation would reach the ground it should not amount to much more than sprinkles/flurries. A much strong short wave trough will move across northern Minnesota and Wisconsin Sunday morning.
The upper level jet and surface cold front located in northern Oklahoma as of the time of this discussion will continue to move south through the morning and as a result we should see decreasing clouds and turning sunny by afternoon. Tonight winds will diminish as the high moves into southwest Kansas and with clear skies efficient cooling should drop temperatures into the upper 20s.
(Today and tonight) The main story for the short term is the cold front that is expected to move through the area this morning and early this afternoon. With the cold front moving through earlier in the day, gusty winds bringing cooler air from the north, and ample cloud cover preventing strong diurnal heating, daytime highs across the area are largely expected to remain in the low to mid 60s. Overnight lows will be much cooler than last night with lows ranging from the low 30s in the Big Country to to low 40s in our southern counties.
131 AM CST Sun Nov 21 2021 A warmer start to the day as high level clouds kept overnight temperatures in the mid 40s, which is nearly 10 degrees warmer than the previous couple of nights. The main focus for today is a cold front that is progged to sweep through the Tennessee Valley this afternoon into the overnight hours. Cold front exits the region fairly quickly keeping rainfall totals between 0.
Upper ridging will translate east and extend into the Northern High Plains for Monday, resulting in continued dry weather along with milder temperatures.
153 AM PST Sun Nov 21 2021 High pressure will allow for continued dry conditions across NorCal today.
/issued 157 AM CST Sun Nov 21 2021/ The cold front has pushed through the northern half of the FA and is currently stationary across the central South Plains. Highs today will be nearly 20 degrees cooler than yesterday, upper 750s to low 60s. This morning's focus remains on an upper level short wave trough progged to move across the intermountain West during the middle of the week. The trend of the models continues to be toward an open trough moving across the southern Plains with any closing of the trough occurring well to our south/southwest.
A ridge of high pressure will build over the region today through Monday. This ridge will open the door for valley inversions (cold pools), to potentially form, particularly the Flathead, Missoula, and Seeley/Swan Valleys. The inversions are not expected to be overly strong, as one piece of the puzzle for creating strong cold pools, are snow/ice and freezing ground temperatures.
435 AM MST Sun Nov 21 2021 Upper level ridge along the west coast will bring a northwest flow aloft today. High temperatures will be near normal with temperatures reaching the lower 50s over northeast Colorado.
Otherwise, if you want cold sunshine, head for the mountains; although cold, very little cloud as high pressure in the upper levels begins to dominate for today through Mon night. This upper level ridge is still expected to break down Tue morning, spreading precipitation, both low elevation rain and snow and higher elevation snow, from west to east across northern zones of the forecast area. Temperature-wise, other than today, should see warming as southerly wind starts to dominate with the approach of this low. Cloud cover on Mon night should allow warmer temperatures for overnight lows. With all the cloud cover on Tue, afternoon temperatures will trend cooler from Mon.
Rain has developed across the southern half of the forecast area as isentropic lift ramps up across the area in advance of an upper trough. Upper forcing will shift off to the east this afternoon, and a weak surface front/trough will move through as well. As the true colder air doesn't arrive until the main cold front moves through tonight, temperatures will warm some during the afternoon, especially west where rain will end first. On Monday, central Indiana will be under an upper trough, but at the surface, high pressure will build in.
For the daytime, an approaching cold front will bring widespread showers. An upper level trough over the eastern U. Lows Monday night will be in the low to mid 20s, with upper teens in some low lying and rural locations.
High pressure will dominate the short term periods as the aformentioned disturbances continues to the eastward. This leaves the forecast area quiet with slightly (up to 10 degrees) warmer than normal temperatures.
506 AM CST Sun Nov 21 2021 (Today and tonight) A cold front is beginning to advance southeast across northeast Oklahoma, and this front will accelerate southeast as the morning wears on.
VCTS comes in late this afternoon and tonight as a cold front moves through the area.
900 AM CST Sun Nov 21 2021 Moisture is increasing across the Tennessee Valley with southerly flow ahead of an approaching cold front. In the upper levels, there is a weak positively tilted trough that extends from the western Great Lakes southwestward into the Southern Plains. There is another trough just to the west diving southeastward across the Upper Midwest. A much more pronounced frontal boundary is associated with the trough across the Upper Midwest. Temperatures today will warm up into the low to mid 60s with warm air advection ahead of the front. The big chill arrives Monday night as clear skies will allow temperatures to plummet down into the low to mid 20s.
- Active pattern of troughs and ridges will result in numerous temperature swings. Today: Another cold front will move through the forecast area today, though this one will be far more noticeable than yesterday's frontal passage. As of 3 AM, the cold front is located near the ND/SD border. The coldest temperatures are expected over Minnesota/Iowa as the high pressure will remain well off to the east of Nebraska.
For Monday, southerly flow returns, and much of central and south-central Kansas will likely end up in the the low 60s while parts of southeast Kansas will struggle to get out of the low 50s. Monday night, most locations within the CWA will be in the low to mid 30s.
503 AM CST Sun Nov 21 2021 (Today and tonight) Cold front starting to increase southward progression early this morning.
A warmer start to the day as high level clouds kept overnight temperatures in the mid 40s, which is nearly 10 degrees warmer than the previous couple of nights. The main focus for today is a cold front that is progged to sweep through the Tennessee Valley this afternoon into the overnight hours. Cold front exits the region fairly quickly keeping rainfall totals between 0. The big chill arrives Monday night as clear skies will allow temperatures to plummet down into the low to mid 20s.
This feature was triggering light returns on radar near the IA/MN border with only occasional spotty reports of anything reaching the ground due to lingering dry air in the low levels. Have maintained a brief period of slight chance PoPs for snow showers across mainly Taylor County, as dryness in the low levels further south will impede anything more than flurries/sprinkles. Winds will ramp up quickly by mid to late morning as a strong cold front plows through with a very strong cold advection response. Continues to look like a rather quiet pattern through the rest of the week as broad ridging takes hold aloft.
The short wave that brought some light precip over mainly the lower elevations was pushing out of the region at this time. the lower clouds are also expected to dissipate, with mostly sunny skies by mid morning all regions. Max temps today will be a bit cooler that yesterdays highs, with temps averaging about 5 degrees cooler. Clear skies along with much drier air (especially in the mtns) will prevail with much cooler temperatures expected tonight as compared to this mornings min temps. Expect 20s most of the plains with some high 10s in the normal cooler spots. Over the rest of the higher terrain expect temps in the 10s to lower 20s.
Details: A positive tilt trough will traverse the plains tonight with a more pronounced trough digging across the northern plains towards the Great Lakes. High clouds are streaming across the southern plains on zonal flow and should continue until dry northwest flow commences later today behind the trough axis. A weak cold front has resulted in northerly winds across the area which will continue through late afternoon. H5 height rises will commence tomorrow as a transient ridge moves over the southern plains.
519 AM CST Sun Nov 21 2021 (Today and tonight) The main story for the short term is the cold front that is expected to move through the area this morning and early this afternoon. With the cold front moving through earlier in the day, gusty winds bringing cooler air from the north, and ample cloud cover preventing strong diurnal heating, daytime highs across the area are largely expected to remain in the low to mid 60s. Overnight lows will be much cooler than last night with lows ranging from the low 30s in the Big Country to to low 40s in our southern counties.
/issued 329 AM CST Sun Nov 21 2021/ Its 15-20 degrees warmer across the Midsouth this morning than it was 24 hours ago. South winds are boosting moisture levels across the area ahead of another cold front approaching the Midsouth. Rain will come to an end tonight with cooler air filtering into the area.
(This afternoon through Monday) Cold front has pushed southeast of I-44 and will be moving into northwest AR and southeast OK later this morning.
High temperatures will be in the 50s, but will drop into the middle to upper 40s across the Illinois River Valley during the afternoon after a cold front passes. 08z/2am surface analysis shows a cold front extending from southern Lake Michigan southwestward along the Illinois River into north-central Missouri. Given overnight lows expected to drop into the lower to middle 20s, wind-chills will bottom out in the teens.
Temperatures are roughly 10 degrees warmer versus this time last night thanks to said cloud cover and southwest surface flow. Upper flow is zonal over the mid south at this time but expected to amplify as the day progresses with an upper trough strengthening as it moves eastward from the central conus, paired with an expanding western ridge. Developing NW flow will drive the cold front through the state with scattered showers developing along and behind the boundary. Northwest flow behind the front and building high pressure will bring much cooler and drier air back into the region.
356 AM MST Sun Nov 21 2021 Current surface map places cold front in southeast Montana/southwest North Dakota. Cold front crosses western South Dakota before daybreak as fast moving clipper dives across eastern North Dakota into Minnesota. Low level warm advection kicks into tonight as upper level ridge builds across the Northern Plains for Monday.
The upper level jet and surface cold front located in northern Oklahoma as of the time of this discussion will continue to move south through the morning and as a result we should see decreasing clouds and turning sunny by afternoon. Tonight winds will diminish as the high moves into southwest Kansas and with clear skies efficient cooling should drop temperatures into the upper 20s. An upper level ridge will move into the central plains on Monday and temperatures will start to warm for the start of the new workweek with highs in the middle 60s.
A low pressure system will produce cloudy and cool conditions for the middle of the week, otherwise temperatures will continue to run right around normal. High pressure will remain over the region through Monday while a developing frontal system pushes into the northwest coast.
244 AM MST Sun Nov 21 2021 Short term period is fairly tranquil, as H5 ridging builds across the Rockies.
Cold front is making progress southward and has entered north central SD. Warmer air begins moving back into the region on Monday as 850 mb temps rise through the single digits above zero. The forecast will start off with upper ridging across the region. Under the ridge, temperatures are expected to be quite mild ahead of an advancing front, with well above normal readings expected.
521 AM CST Sun Nov 21 2021 A cold front will push southward through Nebraska today. Expect this to yield a fairly large range in temperatures today with highs ranging from the lower 40s up near the Niobrara valley to the lower 50s across southwestern Nebraska near Imperial. The increasing mid/high clouds will be associated with a warm front that will bring a quick turn around to temperatures well above normal. Highs Monday will range from the lower 50s near the Niobrara to the low/mid 60s south of Interstate 80.
Overall weather today is quiet with cooler temperatures across the east in the wake of the clipper system but downslope will help moderate temperatures in the central zones.
A high pressure system will favor frosty mornings and mild afternoons through Monday.
329 AM CST Sun Nov 21 2021 Its 15-20 degrees warmer across the Midsouth this morning than it was 24 hours ago. South winds are boosting moisture levels across the area ahead of another cold front approaching the Midsouth. Rain will come to an end tonight with cooler air filtering into the area.
342 AM MST Sun Nov 21 2021 Upper level ridge along the west coast will bring a northwest flow aloft today. High temperatures will be near normal with temperatures reaching the lower 50s over northeast Colorado.
326 AM CST Sun Nov 21 2021 Cold front is making progress southward and has entered north central SD. Warmer air begins moving back into the region on Monday as 850 mb temps rise through the single digits above zero. The forecast will start off with upper ridging across the region. Under the ridge, temperatures are expected to be quite mild ahead of an advancing front, with well above normal readings expected.
A ridge of high pressure will build over the region today through Monday. This ridge will open the door for valley inversions (cold pools) to potentially form, particularly in the Flathead, Missoula, and Seeley/Swan Valleys. The inversions are not expected to be overly strong, as one piece of the puzzle for creating strong cold pools are snow/ice and freezing ground temperatures.
353 AM MST Sun Nov 21 2021 Short term period is fairly tranquil, as H5 ridging builds across the Rockies.
Ahead of this front, increased warm air advection has brought a warmer and more humid air mass off the Gulf and across our forecast area. By this afternoon and evening, the chances for showers will increase especially in vicinity of the cold front. Rain should be south of the area by around sunrise Monday as high pressure and drier air begin to build in behind the front. /NF/ Monday through the week: The cold front that pushes through Sunday and Sunday night will be across the southeast part of the forecast area by early Monday. High pressure at the surface, along with upper ridging, will move into the region behind the front and keep conditions dry for the beginning of the holiday week.
207 AM MST Sun Nov 21 2021 Current surface map places cold front in southeast Montana/southwest North Dakota. Cold front crosses western South Dakota before daybreak as fast moving clipper dives across eastern North Dakota into Minnesota. Low level warm advection kicks into tonight as upper level ridge builds across the Northern Plains for Monday.
(Today and tonight) A cold front is beginning to advance southeast across northeast Oklahoma, and this front will accelerate southeast as the morning wears on.
(Today and tonight) Cold front starting to increase southward progression early this morning.
1215 PM EST Sun Nov 21 2021 Rain showers will overspread the Upper Ohio Valley today in advance of a cold front. GOES imagery shows a trough digging across the Upper Midwest with downstream WSW flow across the Pittsburgh forecast area. Regional radars show precipitation beginning to expand in coverage across the Mid-Ohio River Valley as southwest flow ahead of the trough intensifies and results in strong warm advection coincident with higher moisture. By Monday morning, the cold front will have pushed east of the Allegheny Front. Areas north of I-80 (closer to Lake Erie) may receive some light accumulating snow, as well as the ridges thanks to the orographic lift.
/issued 329 AM CST Sun Nov 21 2021/ It's 15-20 degrees warmer across the Mid-South this morning than it was 24 hours ago. South winds are boosting moisture levels across the area ahead of another cold front approaching the Midsouth. Rain will come to an end tonight with cooler air filtering into the area.
1059 AM CST Sun Nov 21 2021 (Thru this afternoon) Cold front has pushed southeast of I-44 and will be moving into northwest AR and southeast OK later this morning.
The cold front is approaching NW areas of SE Texas, it moved through Waco around 2 PM and should reach CLL around 5 PM, to IAH 8-9 PM, and GLS 11PM-12AM.
Heights will continue to rise as an upper level ridge moves over the western US and high pressure continues to build over the Rockies, and the weather will remain calm and clear for Northeast Colorado. Continue to expect near normal high temperatures in the upper 40s and lower 50s across the plains and in the 30s and 40s in the high country. It should start getting a bit breezy in the Front Range mountains by late afternoon, and gusts in the higher terrain may exceed 40 mph by early evening. Upper level ridge along the west coast will bring a northwest flow aloft today. High temperatures will be near normal with temperatures reaching the lower 50s over northeast Colorado.
244 PM EST Sun Nov 21 2021 High pressure ridge currently stretching from New England back to the central Gulf Coast is expected to move offshore overnight. A cold front across the central US will continue to move eastward overnight and begin to impact the CWA overnight into Monday. The front will quickly push through with high pressure building in from the west Monday night. Gradient is expected to tighten as strong high pressure builds in from the west and a low forms off the east coast later tomorrow. One thing to watch would be the gust potential in the higher elevations of NE GA.
Monday and Monday night, a developing surface warm front in the Lee- Of-The-Rockies surface trof will promote westerly component boundary layer winds. High temperatures on Monday in the low level waa should end up near to above normal especially in and west of the James River valley.
However, we had a great ASCAT pass late in the morning that highlight a significant area of confluent flow emerging in the coastal waters south of the Lower Keys, including Hawk Channel and the Straits of Florida. This quickly resulted in scattered showers and even some relatively impressive isolated thunderstorms forming in the vicinity of Wood's Wall West and East Crack south of the Lower Keys. High pressure will build across the Southeast for the week, before slowly sliding off short late in the week and into the weekend. Light northeast breezes will back to the northwest and freshen on Monday, as a strong cold front approaches the Florida Keys coastal waters.
Tonight through Monday night Dry northwesterly upper flow across the Panhandles tonight with an upper ridge building in over the forecast area Monday and Monday night.
225 PM CST Sun Nov 21 2021 The cold front has already moved through the area early this afternoon with the winds behind the front the main issue. Other than the winds, it looks pretty quiet through Monday as an area of high pressure drops out of the Dakotas into Missouri with the ridge axis extending north over the area.
It's associated cold front has now made it into our far nwrn areas. Meanwhile, a cooler and drier airmass will be filtering swd in the wake of the front, bringing clearing skies from n to s through mid morning Monday. Clear skies and cooler temps very near or just below seasonal normals will carry us through Monday night, as nwly flow aloft and high pressure at the sfc become the predominant influencers.
High pressure will build into the area offering dry weather and below normal temperatures for the start of the work week before moderating somewhat toward the Thanksgiving Day holiday.
1011 AM MST Sun Nov 21 2021 Current surface map places cold front in southeast Montana/southwest North Dakota. Cold front crosses western South Dakota before daybreak as fast moving clipper dives across eastern North Dakota into Minnesota. Low level warm advection kicks into tonight as upper level ridge builds across the Northern Plains for Monday.
336 PM EST Sun Nov 21 2021 A strong cold front will move across the region Monday.
Surface cold fronts to move through the Deep South and FL Peninsula with a chance of showers ahead of and along the front through Monday.
117 PM MST Sun Nov 21 2021 Northwest flow today will back to the west tonight as an upper ridge slides across the area.
The next frontal boundary will emerge over the lower Mississippi River valley on Monday spurred by an mid-level trough amplifying southward from the parent area of low pressure over eastern Canada. The front will lose of the support aloft as it departs northeast with the trough and the surface front erodes as it moves across Florida.
205 PM CST Sun Nov 21 2021 A slug of pacific moisture will continue to shift southward this evening as an upper level trough axis progresses to the south. Upper level ridging will continue to progress eastward during the day on Monday. We will quickly return to weak surface lee troughing/cyclogenesis. With the ridge moving overhead, a significantly drier atmospheric column will take shape over the area along with large scale subsidence.
1024 AM MST Sun Nov 21 2021 Short term period is fairly tranquil, as H5 ridging builds across the Rockies.
1243 PM MST Sun Nov 21 2021 Water vapor shows upper trof over the Great Lakes with upper ridge covering much of the western CONUS. At the surface, high pressure is centered over the Dakotas.
Considerable high cloudiness today associated with a an east to west trough axis and a weak area of low pressure to our west.