Aikyam-Lab/Synoptic-Bench huggingface dataset:
/Issued 933 AM EST Sat Dec 5 2020/ High pressure will prevail today. For the remainder of today, expect mostly sunny skies and no pops as ridge at the surface builds in from the west. In the wake of the cold front, temperatures will be near climo with mid 50s north to around 60 for the south. As winds subside and skies remain mostly clear, improved radiational cooling conditions will allow for lows around freezing for areas north of the metro. Southern stream system moving through Texas on Sunday will quickly eject in to the lower Mississippi Valley for the afternoon hours.
A prominent ridge remains over the western US today, as a low pressure system drops south from Minnesota and Wisconsin into eastern Iowa. While the passing low was able to pull some slightly cooler air into the region, temperatures still managed to top out in the upper 40s and low 50s.
MVFR conditions at KFST should improve to VFR this afternoon as the upper trough exits east of the area. Very little has changed with the forecast this morning as precipitation is already beginning to develop across the Davis/ Glass Mountains and the Lower Trans Pecos. The upper low over N. Large scale ascent associated with the upper low will lead to increasing precipitation over the next several hours. A deformation band is expected to develop on the north side of the upper low as it moves across the Big Bend today. Precipitation will end and skies will clear overnight as the upper low continues east across Texas.
1048 AM EST Sat Dec 5 2020 High pressure and drier air will build in early today and remain over the area through Sunday.
Thereafter, a storm system is expected to bring cooler temperatures, gusty winds and a chance of showers the latter half of the work week.
1044 AM PST Sat Dec 5 2020 Dry, stable, and seasonably cool conditions will continue with areas of low clouds and fog or freezing fog into the weekend.
1017 AM MST Sat Dec 5 2020 WV imagery tonight depicts weak subsidence in the wake of a trof axis that crossed the area yesterday. Some cirrus is evident on IR, streaming swd on the ern periphery of the broader ridge that persists over most of the wrn CONUS. Continue to see some breezy NW winds across the w cntrl SD plains owing to pressure rises behind the aforementioned trof. High pressure advances towards our area over the next 12 hours, leading to a fairly calm day. Low- level thermal ridging nudges into the area Sunday, favoring even warmer temps.
301 PM EST Sat Dec 5 2020 A weak cold front dissipated over Kentucky today leaving a flat pressure gradient in its wake. Cloud cover will increase as an upper low over Minnesota this afternoon drops into central Illinois tonight. On Sunday the Illinois upper low will proceed southeastward into the Ohio Valley while phasing with an upper trough reaching northeastward out of the lower Mississippi Valley. By Sunday evening, the phased upper low will be spinning off to our east. At the same time, a secondary upper level low will be diving southward from Canada and tracking over Lake Michigan.
The upper level low remains near the Big Bend region of Texas and ahead of the feature, lift continues to lead to isolated light showers falling out of high cloud bases across the easter half of the area. Dry weather is then expected to continue Sunday night with a weak front moving through the area on the backside of the upper low. Lows will be in the lower to middle 30s once again.
BW Chattanooga Airport, TN 31 55 36 46 28 / 0 10 20 20 0 Knoxville McGhee Tyson Airport, TN 30 51 35 43 27 / 0 0 20 20 10 Oak Ridge, TN 29 51 35 43 27 / 0 0 20 20 10 Tri Cities Airport, TN 26 49 33 41 25 / 0 0 30 30 10.
Unfortunately, another round of widespread fog and freezing fog is likely tonight thanks to mostly clear skies, light winds, and temperatures falling into the upper 20s to low 30s. Once the morning fog clears on Sunday, an upper level low over Texas is forecast by guidance to merge with the polar jet located over us before shifting off to the east.
Dry easterly flow is in place aloft as an upper low churns over the Big Bend. This will transition to northerly flow as the upper low departs to the east.
155 PM MST Sat Dec 5 2020 Clear skies and temperatures 10 to 15 degrees above normal today as southeast Wyoming and the western Nebraska Panhandle sit pinned under the influence of a upper level ridge.
307 PM CST Sat Dec 5 2020 Tonight and Sunday: Mid/upper level ridge has quickly shifted east this afternoon allowing southwest flow to begin streaming high level moisture into the area.
Winds have relaxed and will trend toward calm conditions through tonight as surface ridging continues to nose across the region. As the afternoon comes to a close, high clouds will stream overhead on the west on near zonal flow, preceding an opening upper low tracking eastward over southern Plains. Tonight, under the high clouds, lows will range from the upper 30s across near the Altamaha River basin of SE GA to the mid/upper 40s toward the St Johns River basin & Atlantic coast.
Latest water vapor imagery is showing an upper low over the upper Midwest that is sinking southward. Latest runs of the HREF/GFS/NAM show this upper low dropping through Great Lakes into the Ohio Valley tonight into early Sunday.
Temperatures were in the lower 70s throughout most of the Keys, with 69F reported at the Key Deer Refuge RAWS toward the north end of Big Pine Key. The evening sounding showed westerlies had dried out the 750-450 mb layer, as a small mid-level trough axis in the same layer has moved east to near Andros Island, just slightly perceptable in the 10-7. The main weather issue ovenight will be the possible expansion of the stratus field across the Gulfside/Bayside waters and advecting southwest from the Everglades as high pressure moves east along the northern Gulf coast.
416 PM MST Sat Dec 5 2020 Quiet weather continues with low pressure to our south slowly moving eastward across Texas today. High pressure remains in place across the western CONUS. Another trough on the horizon off the Pacific Northwest coast will break up the quasi-rex block pattern.
A broad upper ridge remains in place across the western US with the axis centered over western Montana. The ridge axis moves closer to the western Dakotas Sunday, promoting even warmer temperatures than today. Highs should range from the lower 40s across the Turtle Mountains to near 60 across portions of the southwest.
scattered to broken high clouds are forecast to continue across much of the CWA as a low pressure system pushes eastward across Texas. an upper low dropping southeast through the Midwest could aid in scattered mid clouds across far Northwest Arkansas Sunday afternoon. A weak surface cold front currently working across northeast Oklahoma will move south and east of the Tulsa CWA late tonight. This will result in a slightly cooler day on Sunday.
/issued 133 PM EST Sat Dec 5 2020/ Broad upper trough holds over the East Coast of the US while upper low over Texas quickly opens and moves in fast southern jet stream over the Gulf Coast region next few days. Weak cool front will continue to move southward over S FL this afternoon/evening as high pressure moving through the region will dry conditions through tonight into Sunday.
Troughing along the coast still expected to develop tonight as low pressure moves into NETX tomorrow morning. High pressure will build into the area throughout the day tomorrow and rain chances diminish through the morning. Along I-45 and south of I-10 will get into the low 40s and around 50 at the coast. Tomorrow, mostly clear skies and drier air will allow the area to warm into the low to mid 60s and then drop to around 40 at night.
631 PM EST Sat Dec 5 2020 Weak high pressure will extend across the Great Lakes tonight. As Sunday evening begins with the upper low over the eastern half of the forecast area, the region is still expected to see flurries and northerly flow through Sunday night.
930 PM EST Sat Dec 5 2020 Weak high pressure will extend across the Great Lakes tonight. As Sunday evening begins with the upper low over the eastern half of the forecast area, the region is still expected to see a chance of flurries and northerly flow through Sunday night.
146 PM PST Sat Dec 5 2020 Low pressure will bring a round of light snow showers to far northeast California and northwest Nevada tonight into Sunday.
/22/ Tonight and Sunday: Mid/upper level ridge has quickly shifted east this afternoon allowing southwest flow to begin streaming high level moisture into the area.
543 PM CST Sat Dec 5 2020 High pressure will weaken tonight over Arkansas. An upper low will move out of north Texas tonight and will be merging with a cold front over Arkansas Sunday.
624 PM CST Sat Dec 5 2020 For the ArkLaTex terminals we will see increasing VFR cigs overnight with an upper low over the Rio Grande headed right this way. Light SW wind or calm overnight will become W/NW 5-10 KT in the wake of the upper low Sun aftn. /Tonight through Sunday Night/ Clouds will continue to be on the increase this evening and overnight as the closed low quickly lifts northeastward across Central Texas and provide for some isentropic forcing across our region. On Sunday, the upper low will continue to shift northeastward into the region and help drag a weak cold front with it. Dry weather will return late Sunday as the upper low will weaken and move eastward out of the region.
The area remains warm and dry under mostly clear skies and strong ridging aloft. Very little change in the upper air pattern through Sunday with the high amplitude ridge of high pressure in control over Colorado. A weak Pacific system incoming off the Pacific Northwest will encounter the ridge force field and drop southward through the Great Basin on Sunday.
511 PM CST Sat Dec 5 2020 (This evening through Sunday) The upper low over southwest Texas will continue to move east- northeast to our south across Texas. The clouds and the precipitation chances will shift out of the area through the day on Sunday as the upper low moves away. The temperature at Buffalo is 15 to 20 degrees cooler than mesonet sites southeast of the snow area as close as Fairview, Cherokee or Taloga.
815 PM EST Sat Dec 5 2020 Drier air continues to filter into the forecast area this evening in the wake of a cold front which is now located across the southern peninsula. Some lingering lower clouds can be expected in the vicinity of stalling front across southwest Florida, otherwise a slow increase in mid and high clouds can be expected overnight ahead of a mid level trough which will approach from the west on Sunday. Temperatures the remainder of tonight will be cooler than last night with lows bottoming out in the lower to mid 40s across the Nature Coast, and upper 40s to lower 50s central and south. As mentioned above on Sunday a mid level trough will approach from the west.
201 PM MST Sat Dec 5 2020 Latest water vapor imagery shows a ridge over the western CONUS with northerly/northwesterly flow bringing in a few high clouds across the forecast area. At the surface, high pressure is over the area with temperatures mainly in the 50s.
A weak cold front dissipated over Kentucky today leaving a flat pressure gradient in its wake. Cloud cover will increase as an upper low over Minnesota this afternoon drops into central Illinois tonight. On Sunday the Illinois upper low will proceed southeastward into the Ohio Valley while phasing with an upper trough reaching northeastward out of the lower Mississippi Valley. By Sunday evening, the phased upper low will be spinning off to our east. At the same time, a secondary upper level low will be diving southward from Canada and tracking over Lake Michigan.
942 PM EST Sat Dec 5 2020 As a cold front cleared the local area, low clouds continued to pushed south while also dissipating.
As the actual cutoff low approaches tomorrow afternoon, we'll see the precip end, the low-level moisture scour out and VFR conditions return. Weak high pressure is located across the northwest gulf coast this afternoon, however an upper low is moving east deeper into Texas from Northern Mexico and New Mexico. Moisture is streaming from the Pacific ahead of the upper low. Through the afternoon and evening light rain/sprinkles will continue east and gradually exit, however additional shower activity will redevelop as the upper low draws closer. A weak area of low pressure is developing in the western gulf and this feature will head east through Sunday.
931 PM EST Sat Dec 5 2020 Weak high pressure will extend across the Great Lakes tonight. As Sunday evening begins with the upper low over the eastern half of the forecast area, the region is still expected to see a chance of flurries and northerly flow through Sunday night.
231 PM MST Sat Dec 5 2020 Quiet weather continues with low pressure to our south slowly moving eastward across Texas today. High pressure remains in place across the western CONUS. Another trough on the horizon off the Pacific Northwest coast will break up the quasi-rex block pattern.
Upper level ridging continues to dominate across The Treasure State in the short term. Subsidence and drying are forecast, favoring warmer than average temperatures throughout most of the region.
427 PM MST Sat Dec 5 2020 00Z TAF CYCLE High clouds over southeast NM will exit the region tonight as an upper low pulls away into TX.
431 PM MST Sat Dec 5 2020 Latest water vapor imagery shows a ridge over the western CONUS with northerly/northwesterly flow bringing in a few high clouds across the forecast area. At the surface, high pressure is over the area with temperatures mainly in the 50s.
455 PM MST Sat Dec 5 2020 Quiet weather continues tonight under strong upper level ridge. JKL Quiet weather will continue to end the weekend and start the new week as a ridge of high pressure will be positioned over the northern Rockies.
341 PM CST Sat Dec 5 2020 Another chance for some freezing fog/fog across portions of the forecast area overnight.
Conditions will once again become favorable for fog tonight, and in some cases, freezing fog. On Sunday, the high pressure will shift east as a strong northwest flow low drops southeast through the eastern Corn Belt and middle OH Valley, and the upper low moving through TX begins to advance into the lower MS valley.
Weak high pressure is located across the northwest gulf coast this afternoon, however an upper low is moving east deeper into Texas from Northern Mexico and New Mexico. Moisture is streaming from the Pacific ahead of the upper low. Through the afternoon and evening light rain/sprinkles will continue east and gradually exit, however additional shower activity will redevelop as the upper low draws closer. A weak area of low pressure is developing in the western gulf and this feature will head east through Sunday.
935 PM EST Sat Dec 5 2020 Seasonably cool high pressure will build across the Carolinas through early Sunday. Weak low pressure will then develop over the Carolinas later Sunday and Sunday night. Cannot rule out the potential for some orographic cirrus enhancement over the Appalachian Mountains tonight, otherwise high pressure will allow for clear skies and light winds. Overnight lows should be within a few degrees of the freezing mark. An energetic/perturbed flow within the long wave trough in place over the eastern US will yield a quick return of moisture to the area, initially in the forms of clouds late Sunday afternoon/evening, followed by some light rain chances Sunday night.
We'll see decreasing clouds from west to east gradually overnight into Sunday morning as reinforcing high pressure settles in.
956 PM EST Sat Dec 5 2020 Strong low pressure will track east of the Maine coast overnight and into the Canadian Maritimes on Sunday.
417 PM MST Sat Dec 5 2020 Clear skies and temperatures 10 to 15 degrees above normal today as southeast Wyoming and the western Nebraska Panhandle sit pinned under the influence of a upper level ridge.
530 PM CST Sat Dec 5 2020 Currently have a nor'easter lifting across the Northeast Seaboard with a closed low migrating towards southwest TX. Southern Plains closed low will continue sliding east and will be approaching the Arklatex region by late Sun morning. This will all result in persistent upper troughing from the Great Lakes into the Tennessee Valley with below normal temps for the same region.
/issued 341 PM CST Sat Dec 5 2020/ Another chance for some freezing fog/fog across portions of the forecast area overnight.
As a result, overnight temperatures should not drop much below the middle 20s with slightly warmer readings near Lake Michigan.
Fog formation is again looking likely and with those sub-freezing temps, freezing fog could once again be an issue. Therefore, we have issued a freezing fog advisory for the entire mid state and it will remain in effect until 9 AM.
However, right on its heels is another trough that will track across the western Great Lakes, displaced east from the this morning's wave. Although some clearing is occurring in the wake of the lead upper trough early today , plenty of stratus is evident across much of MN/Ontario, and this will likely spread gradually south and east today and tonight within low-level northerly flow.
There is still some potential for a rain snow mix favoring the higher elevations of the NE mountains late tonight but significant accumulations are Not expected as any precip amounts are just looking too small.
823 PM MST Sat Dec 5 2020 Large scale ridge of high pressure prevailed over the Rockies and High Plains this evening. Clear skies and temperatures 10 to 15 degrees above normal today as southeast Wyoming and the western Nebraska Panhandle sit pinned under the influence of a upper level ridge.
No rain is expected tonight and temperatures were on track to bottom out warmer than last night. /22/ Prior discussion below: Tonight and Sunday: Mid/upper level ridge has quickly shifted east this afternoon allowing southwest flow to begin streaming high level moisture into the area.
A strong low pressure system will be moving from off the northern Maine coast to southeastern Canada today. Lows will be seasonably chilly, mainly in the lower to mid 20s, with some readings in the teens across portions of the Catskills and northern Oneida County.
(Today and tonight) Upper low over north-central Texas will continue to move move east today, with a brief period of light rain still possible this morning across far south-central and southeast portions of the forecast area. It will remain about 10 to 15 degrees cooler over and near Harper county where snowpack remains.
1011 PM MST Sat Dec 5 2020 Large scale ridge of high pressure prevailed over the Rockies and High Plains this evening. Clear skies and temperatures 10 to 15 degrees above normal today as southeast Wyoming and the western Nebraska Panhandle sit pinned under the influence of a upper level ridge.
325 AM EST Sun Dec 6 2020 Conditions will remain governed locally over the next 72 hours by a high amplitude pattern featuring energetic but relatively moisture starved longwave troughing. The first in a series of closed mid level circulations sweeping through the trough periphery will skirt harmlessly by to the south today.
We are watching for freezing fog in the Davis Mountains in and around Marfa/Alpine, but nothing has shown up yet. Much warmer conditions will start this new week as weak ridging replaces the trough that affected us yesterday. Guidance continues to trend warmer over the next several days with highs generally in the 60's and 70's.
136 AM MST Sun Dec 6 2020 High pressure continues over the Rockies with clear skies and dry weather.
245 AM CST Sun Dec 6 2020 A highly amplified flow continues to dominate the country with ridging across the Rockies and troughing over the eastern conus. Early this morning a weak area of low pressure was located over southeast Missouri, with its trailing cold front already through the region. Temperatures will cooler today with the re-enforcing shot of cooler air with highs ranging from the middle 40s across central Missouri, to the low 50s along the Arkansas border. For tonight, an area of high pressure will build across Kansas and Oklahoma, with a northerly flow continuing over Missouri.
Upper troughing settles over the region this evening with cold Canadian airmass pushing in at the surface. A cool, dry trough will park over the northeastern portion of the U.
Temperatures tomorrow will be a little cooler than they were today, but still well above seasonal norms, with highs in the low to mid 50s across the plains, although the southern valleys will remain in the 30s and 40s tomorrow. Upper level ridging continues to dominate across The Treasure State in the short term. Subsidence and drying are forecast, favoring warmer than average temperatures throughout most of the region.
Current satellite water vapor imagery shows moisture across north central Texas in association with an upper level closed low over central Texas with mid to high level clouds clipping the far southern Texas Panhandle. This low pressure system will continue to push east and become absorbed with an even strong closed low digging across the Mid-Atlantic. Meanwhile, ridging in the west will traverse east over the forecast area as a trough in the Pacific Northwest comes onshore.
Low pressure deepening off the east coast will reach the Gulf of Maine tonight. Due to the marginal temperatures aloft only minimal accumulations are expected, although the higher terrain of the western Southern Tier and Bristol Hills could see an inch or two of accumulation by daybreak. A large scale trough will be over the eastern third of North America for the start of the week. Multiple closed lows will rotate around the eastern Great Lakes while as a screaming upper level jet moves off the Mid-Atlantic coast. The main trough will sharpen leaving the eastern Great Lakes on the backside.
Approaching low pressure is anticipated to introduce some snow showers into eastern Oregon after midnight, which will spread into southwestern Idaho on Sunday morning. Most snow shower activity is expected to remain over the higher elevations, with increased cloud cover expected for much of the area through Sunday evening. Despite an approaching area of low pressure on Sunday the area will continue to see light winds, and lowered mixing heights into the upcoming work week.
247 AM CST Sun Dec 6 2020 The upper pattern over the next few days persists with a western ridge and eastern trough. Multiple waves dive through the eastern trough with a wave early today bringing somewhat cooler temps and likely some stratus to the east.
1023 PM MST Sat Dec 5 2020 Latest water vapor imagery shows a ridge over the western CONUS with northerly/northwesterly flow bringing in a few high clouds across the forecast area. At the surface, high pressure is over the area with temperatures mainly in the 50s.
Main precip still expected to remain south of the Red River tonight as upper low shifts slowly eastward across north Texas with only scattered mid/high clouds along/south of I-40.
1017 PM CST Sat Dec 5 2020 Currently have a nor'easter lifting across the Northeast Seaboard with a closed low migrating towards southwest TX. Southern Plains closed low will continue sliding east and will be approaching the Arklatex region by late Sun morning. This will all result in persistent upper troughing from the Great Lakes into the Tennessee Valley with below normal temps for the same region.
High clouds are expected to increase in coverage during the day Sunday as a low pressure system moves across Texas and a second upper low drops southeast through the Midwest. Some scattered mid clouds may also be possible Sunday afternoon across far Northwest Arkansas as the northerly wave trof axis moves through the region. Main precip still expected to remain south of the Red River tonight as upper low shifts slowly eastward across north Texas with only scattered mid/high clouds along/south of I-40.
126 AM EST Sun Dec 6 2020 Weak high pressure will extend across the Great Lakes tonight. As Sunday evening begins with the upper low over the eastern half of the forecast area, the region is still expected to see a chance of flurries and northerly flow through Sunday night.