Aikyam-Lab/Synoptic-Bench huggingface dataset:
259 PM MDT Tue Jul 20 2021 At least a few showers and thunderstorms will continue this evening across the higher terrain, where a fairly robust monsoonal moisture surge has increased precipitable water amounts to above normal values. Upper level ridge will continue to spin over Colorado tonight and tomorrow and will gradually weaken/flatten by tomorrow afternoon. 05" across the high terrain, and generally 1.
238 PM CDT Tue Jul 20 2021 High pressure at the surface will shift southeast tonight and allow a southerly wind to develop. This will bring warmer low temperatures with more areas bottoming out in the mid 60s tonight. Upper level ridging builds into the area on Wednesday with a mid level wave expected to move through ND into northern MN. The inversion will once again not be too strong so dew points will remain in the lower to mid 60s. Highs will be a bit warmer, ranging from roughly 85 to 95, with the warmest readings in central SD.
This afternoon, the synoptic pattern was characterized by ridging placed over the Northern Rockies while a closed low was spinning off the coast of British Columbia. The latest guidance does have slight chance PoPs lingering in the James River Valley Wednesday afternoon, before the low finally pushes east of the forecast area.
315 PM CDT Tue Jul 20 2021 Moist atmosphere to remain in place, however subsidence inversion and proximity to ridge should preclude all but very isolated convective activity this evening. James The persistent upper level trough that has extended from the northeastern CONUS to the southern Great Plains will see its western end split from the main trough, close off and drift westward, the speed of which is the main driver of uncertainty in the forecast. This faster speed takes the closed low to Arizona by early weekend with upper ridging then amplifying over the southern and central Great Plains.
220 PM MDT Tue Jul 20 2021 Upper level ridge axis extended from the Northern Plains to the Four Corners. Subtropical/monsoon moisture plume was spreading northward underneath the ridge.
An upper level low currently over Louisiana will track west, toward West Central Texas on Wednesday.
High pressure builds in for Wednesday with the high shifting east into lower MI Wednesday night.
1225 PM CDT Tue Jul 20 2021 A weak surface frontal boundary/trough was draped across the UP of Michigan through northern MN. The afternoon hours contains the highest potential for precipitation with strongest mid-level vorticity advection and low- level moisture advection during this time.
An upper trough of low pressure to the west of the area will gradually lift into Canada. This will allow the pattern to first become more zonal, then allow a ridge of high pressure over the interior west to begin building up into the area, producing a warming trend for the weekend.
Water vapour had upper ridge centered over the four corners region.
A 500 mb trough over deep south Texas with a closed low over central and eastern Texas will allow for scattered showers and thunderstorms to develop this afternoon and evening into Wednesday. PWATs are forecasted to be well over 2 inches, especially across the Lower Valley through the period. Temperatures will remain generally in the 70s overnight tonight and Wednesday night while Wednesday highs will rise into the low 90s.
1122 AM MDT Tue Jul 20 2021 Western CONUS ridge will remain in place supporting hot and mainly dry conds in the period most places. Weak ridge topping impulses combined with bouts of monsoon moisture will support isold TS at times. Convection will shift slowly east with the trough this evening eventually becoming elevated and driven by an expected LLJ, with any activity mainly confined to NW SD overnight. Weaker CIN will be in place over the Black Hills, with diurnal heating and combined LL moisture sufficient for isolated storms via mid ridge convergence. Isolated TS will develop along the trough with dry lightning possible.
Winds will come around to southerly on Wednesday morning and temperatures will be a slightly warmer tomorrow than today.
1207 PM CDT Tue Jul 20 2021 (Today and tonight) Dry and slightly cooler weather is in store for today.
A large upper ridge will continue to build over the Plains the next few days, allowing temperatures to creep up to around 100F but also directing Western US wildfire smoke into the region.
To our north, there is weak low pressure over the Great Lakes with a cold front stretching back through MI/WI. Low temps will be in the low to mid 60s. Dry cold front drops down from the north on Wednesday and crosses the area late Wednesday night.
A weak area of low pressure is over Acadiana with showers and a few storms in the region. Slightly drier air is filtering into Southeast Texas behind the low. A weak cold front is drifting into the region today while an upper low is in vicinity.
(This afternoon through Wednesday night) An upper ridge extends from southern Arizona to the northern Plains. A broad upper ridge will be over the southern half of the country on Wednesday with an upper low over central Texas.
1114 AM MDT Tue Jul 20 2021 Current RAP analysis continues to highlight the upper level ridge over much of Colorado and Wyoming. Latest satellite imagery this morning continues to show the moisture stream west of the ridge axis over Utah and Idaho associated with a few showers over the area. Expecting convection to develop over the higher terrain this afternoon with showers and thunderstorms continuing into early evening.
Some mid-level dry air will advect into the area from the Gulf of Mexico on Wednesday as the ridge to the south expands northward.
A dry southwest flow aloft prevails over central CA today as the region remains situated in between high pressure centered over the Four Corners area and an upper trough near 130W.
Upper level troughing will remain persistent over the eastern US through much of the weekend. Daytime highs will only be in the low to mid 80s due the amount of clouds, moisture, and expected afternoon rains. An upper level trough will be located over the US East Coast. Lows will be in the low 70s for most areas. Global ensembles continue to keep a persistent trough over the eastern US through much of the weekend. By late in the forecast period, the upper trough is expected to push out of the region with upper heights building over the Southeast.
Building heat and humidity continue to be the main focus of the forecast as the previously mentioned ridge continues to advance into the Plains.
1230 PM CDT Tue Jul 20 2021 (Today and tonight) Subsidence behind the departing upper-level trough will generally stifle convective development today. On the smaller scale, though, ripples in the flow aloft, plus the high moisture content of the lower atmosphere may successfully crank out a few (light) showers mainly over the southern half of Oklahoma and northern Texas. Relatively cool (for summer in the southern Plains) conditions will start to give way to more typical readings, as a warm-up begins today under an expanding upper-level ridge to our northwest.
141 PM MDT Tue Jul 20 2021 Low pressure system and cold front is moving east through eastern Montana this afternoon. Skies clear late tonight and upper ridge builds back into the area during the day on Wednesday. Ridge moves to the east Wednesday Night and a wave in SW flow aloft could bring a chance of thunderstorms to the western half of the region.
206 PM EDT Tue Jul 20 2021 High pressure will offer near seasonal temperatures and mainly dry conditions through the middle of the week.
209 PM EDT Tue Jul 20 2021 Warmer and more humid conditions are expected today south of a cold front dropping southward from the eastern Great Lakes. A cold front will sweep through central Pennsylvania on Wednesday, ushering in cooler temperatures and refreshingly low humidity for the rest of the work week before rain chances, heat and humidity make a comeback for the weekend. Smoke mixing down to the surface will create slight reductions in visibility and some air quality alerts for the Lower Susquehanna and Ohio River Valleys.
Tonight and Wednesday A cold front has pushed south of the area, which has essentially ended the threat for precipitation across the region as satellite imagery shows very flat cumulus clouds across the region. Therefore, fairly quiet weather is expected across the region through Wednesday as high pressure builds in across the western Great Lakes region.
Mid to upper trough continues to extend down from the Northeast CONUS with ridge over the Gulf coast to the south.
1111 AM EDT Tue Jul 20 2021 Warmer and more humid conditions are expected today south of a cold front dropping southward from the eastern Great Lakes. A cold front will sweep through central Pennsylvania on Wednesday, ushering in cooler temperatures and refreshingly low humidity for the rest of the work week before rain chances, heat and humidity make a comeback for the weekend. Smoke mixing down to the surface will create slight reductions in visibility and some air quality alerts for the Lower Susquehanna and Ohio River Valleys.
Deterministic runs move the axis of the upper trough/low slowly westward across the CWA during the period. Thus, Tonight, anticipate isolated convection overnight over the CWA owing to the upper trough/weak surface boundary. Wednesday, scattered convection anticipated owing to the upper trough/low and increasing moisture. Wednesday night, although the boundary will likely be non- existent, greater moisture over the CWA and the upper trough may result in isolated convection.
1126 AM EDT Tue Jul 20 2021 Warmer and more humid conditions are expected today south of a cold front dropping southward from the eastern Great Lakes. A cold front will sweep through central Pennsylvania on Wednesday, ushering in cooler temperatures and refreshingly low humidity for the rest of the work week before rain chances, heat and humidity make a comeback for the weekend. Smoke mixing down to the surface will create slight reductions in visibility and some air quality alerts for the Lower Susquehanna and Ohio River Valleys.
Upper level troughing will remain persistent over the eastern US through much of the weekend. An upper level trough will be located over the US East Coast. Lows will be in the low 70s for most areas. Global ensembles continue to keep a persistent trough over the eastern US through much of the weekend. By late in the forecast period, the upper trough is expected to push out of the region with upper heights building over the Southeast.
Large upper ridge continues from the southwest US up into the northern Plains. Perhaps a few degrees cooler with slight push of drier air from the northeast.
A ridging west and troughing east setup over and near the lower-48 apparently will continue into the late week. Heading into the weekend, we will be in northwesterly flow as the stubborn upper level trough glides up the New England coast and a ridge of high pressure builds in across the Plains and Midwest.
18Z TAF CYCLE Upper ridge axis has been tilting from southwest to northeast from srn AZ through north central CO and will continue to move clockwise for the next 24 hrs. Convection to favor the higher terrain and the eastern plains prior to 00Z then storms will be focused over central and wrn NM.
141 PM CDT Tue Jul 20 2021 Moist atmosphere to remain in place, however subsidence inversion and proximity to ridge should preclude all but very isolated convective activity this evening. James The persistent upper level trough that has extended from the northeastern CONUS to the southern Great Plains will see its western end split from the main trough, close off and drift westward, the speed of which is the main driver of uncertainty in the forecast. This faster speed takes the closed low to Arizona by early weekend with upper ridging then amplifying over the southern and central Great Plains.
Compared to 24 hours ago, temperatures are running several degrees cooler up and down the Sacramento Valley. This will similarly translate over to today's afternoon highs, ranging from the low 90s to near 100 deg F for Valley communities. Northern California finds itself wedged between an upper level ridge centered near the Four Corners and an upper level trough that is sagging along the 130W meridian.
1200 PM MDT Tue Jul 20 2021 Today will see the previously dominant ridge of high pressure tilt eastward with its axis settling over the Northern Plains. We're not out of the woods yet as far as gusty outflow winds go with an inverted-V profile still evident on forecast soundings for many of the lower valley locations. The upper level ridge will begin to flatten on Wednesday as a broad Pacific trough elongates off the northwestern CONUS and progresses inland.
A weakening upper trough and surface boundary responsible for the showers and storms continued to lurk just south of our area. Shower and storm chances will be confined to just our southern row or 2 of counties on Wednesday as upper level ridging presses in from the northwest and the trough to our south continues to weaken. This will bring more sunshine and slightly warmer temps.
256 PM CDT Tue Jul 20 2021 High pressure over the north central states will continue to produce a northeast wind flow of rather dry air.
An upper level low currently over Louisiana will track west, toward West Central Texas on Wednesday. (Wednesday night through next Tuesday) The upper level ridge centered over the Four Corner region that's keeping much of the area dry at the beginning of the period will slowly be replaced by a cutoff low retrograding west towards the area from East Texas.
1157 AM EDT Tue Jul 20 2021 Warmer and more humid conditions are expected today south of a cold front dropping southward from the eastern Great Lakes. A cold front will sweep through central Pennsylvania on Wednesday, ushering in cooler temperatures and refreshingly low humidity for the rest of the work week before rain chances, heat and humidity make a comeback for the weekend. Smoke mixing down to the surface will create slight reductions in visibility and some air quality alerts for the Lower Susquehanna and Ohio River Valleys.
104 PM EDT Tue Jul 20 2021 Dry weather is expected until a crossing cold front returns shower and thunderstorm chances to the area tonight and early Wednesday.
303 PM EDT Tue Jul 20 2021 A weak and dry cold front pushes through the region overnight with slightly cooler weather for Wednesday.
Given the higher than usual uncertainty, will opt to keep only slight PoPs for most of the island chain tonight.
High pressure over the north central states will continue to produce a northeast wind flow of rather dry air.
a northeast to southwest oriented upper level ridge axis centered over southwest Colorado will remain nearly stationary. the upper level ridge expands across the northern and central plains allowing 850mb temperatures to warm another 5F or so. Low temperatures fall into the low to mid 60s.
Upper level troughing will remain persistent over the eastern US through much of the weekend. With the clouds expect overnight lows to remain in the low 70s. An upper level trough will be located over the US East Coast. Lows will be in the low 70s for most areas. Global ensembles continue to keep a persistent trough over the eastern US through much of the weekend. By late in the forecast period, the upper trough is expected to push out of the region with upper heights building over the Southeast.
719 PM EDT Tue Jul 20 2021 A crossing cold front will bring the risk for showers and thunderstorms overnight and into Wednesday morning.
Central Illinois will continue to be under the influence of high pressure, centered in western Iowa, through the evening and early tonight. A weak cold front near the WI/IL border early this afternoon, will get a bit of a push overnight with a NNE fetch off of Lake Michigan.
Upper level troughing will remain persistent over the eastern US through much of the weekend. Extensive cloud coverage and abundant low level moisture will keep temperatures mainly in the low 70s to around 70 degrees. An upper level trough will be located over the US East Coast. Lows will be in the low 70s for most areas. Global ensembles continue to keep a persistent trough over the eastern US through much of the weekend. By late in the forecast period, the upper trough is expected to push out of the region with upper heights building over the Southeast.
However with the upper level trough still over the region, redevelopment will remain possible the remainder of the night. Due to the orientation of the upper level trough axis redevelopment looks least favorable generally along the Natchez Trace so greatest pops will be carried in the northwest and southeast.
932 PM EDT Tue Jul 20 2021 An upper level ridge centered to the southeast of the area will build over the area tonight and Wednesday. Overnight lows will be in the low to mid 70s. Some mid-level dry air will advect into the area from the Gulf of Mexico on Wednesday as the ridge to the south expands northward.
Winds will remain light and variable thanks to the weak area of low pressure.
Upper level troughing will remain persistent over the eastern US through much of the weekend. An upper level trough will be located over the US East Coast. Lows will be in the low 70s for most areas.
1021 PM EDT Tue Jul 20 2021 Latest surface analysis shows high pressure centered over SW IA with the OH Valley situated between two boundaries, one across the southern Great Lakes and the other across the southern Gulf States.
The influence of both a stationary sfc boundary and a departing area of low pressure aloft led to widespread showers and storms earlier this afternoon and into this evening. A ridging west and troughing east setup over and near the lower-48 apparently will continue into the late week. Heading into the weekend, we will be in northwesterly flow as the stubborn upper level trough glides up the New England coast and a ridge of high pressure builds in across the Plains and Midwest.
/issued 315 PM CDT Tue Jul 20 2021/ Moist atmosphere to remain in place, however subsidence inversion and proximity to ridge should preclude all but very isolated convective activity this evening. James The persistent upper level trough that has extended from the northeastern CONUS to the southern Great Plains will see its western end split from the main trough, close off and drift westward, the speed of which is the main driver of uncertainty in the forecast. This faster speed takes the closed low to Arizona by early weekend with upper ridging then amplifying over the southern and central Great Plains.
Some low cloud development is possible overnight, but given some drier northeast flow in the low-levels, we will continue to only mention SCT low clouds tonight.
631 PM EDT Tue Jul 20 2021 High pressure remains in control through today. A weak cold front crosses Wednesday.
510 PM MDT Tue Jul 20 2021 Upper level ridge axis extended from the Northern Plains to the Four Corners. Subtropical/monsoon moisture plume was spreading northward underneath the ridge.
749 PM EDT Tue Jul 20 2021 A cold front pushing south through the region will generate some strong thunderstorms through this evening, then cooler more comfortable conditions will follow for much of the remainder of the work week. Cooler and less humid. but 40s possible across cooler portions of Srn Tier.
758 PM EDT Tue Jul 20 2021 Deep tropical moisture holding across the area allowed for another afternoon of scattered to numerous thunderstorms, with the west coast sea breeze keeping the highest rain chances over the interior. The forecast looks on track with a few morning showers possible near the coast Wednesday, then scattered to numerous afternoon storms expected in the afternoon, with the highest chances over the interior. A few morning showers will be possible, then numerous storms are expected in the afternoon with the highest storm chances over the interior. Atlantic high pressure will continue to ridge across southern Florida and into the eastern Gulf of Mexico through the rest of the week and into the weekend.
A weak impulse of low pressure currently over south central Louisiana will ride slowly eastward along the boundary eventually moving off to our east by Wednesday AM.
Then cooler more comfortable conditions will follow for much of the remainder of the work week. Late this evening a cold frontal boundary is across the region, with this boundary expected to continue to drop southward overnight. Cooler and less humid. but 40s possible across cooler portions of Srn Tier.
a weak mid/upper level low centered over Louisiana was slowly making its way westward. high pressure was common over the region underneath mostly clear skies over the CWA.
At least a few showers and thunderstorms will continue this evening across the higher terrain, where a fairly robust monsoonal moisture surge has increased precipitable water amounts to above normal values. Upper level ridge will continue to spin over Colorado tonight and tomorrow and will gradually weaken/flatten by tomorrow afternoon. 05" across the high terrain, and generally 1.
/issued 348 PM CDT Tue Jul 20 2021/ The upper low continues to churn over the Mid-South this afternoon, as seen from GOES east Water Vapor Imagery. The upper low will continue to influence the weather through Wednesday as it slowly retrogrades west. The upper level ridge will build in across the central United States by this weekend.
902 PM EDT Tue Jul 20 2021 A cold front extending west to east across the North Carolina/South Carolina border will linger through Wednesday.
The weather pattern for the Desert Southwest remains dominated by an expansive upper ridge over the Four Corners.
623 PM CDT Tue Jul 20 2021 High pressure at the surface will shift southeast tonight and allow a southerly wind to develop. This will bring warmer low temperatures with more areas bottoming out in the mid 60s tonight. Upper level ridging builds into the area on Wednesday with a mid level wave expected to move through ND into northern MN. The inversion will once again not be too strong so dew points will remain in the lower to mid 60s. Highs will be a bit warmer, ranging from roughly 85 to 95, with the warmest readings in central SD.
Very comfortable conditions were ongoing across this area this afternoon with dewpoints in the low/mid 60s, temps around 80 and a light northeast breeze. This is due to high pressure across northwest Missouri. Afternoon cumulus will dissipate by sunset with another pleasant night in store as the high slides over central Missouri.
653 PM EDT Tue Jul 20 2021 A weak and dry cold front pushes through the region overnight with slightly cooler weather for Wednesday.
1030 PM EDT Tue Jul 20 2021 Currently - Light to gentle east to southeast breezes across much of the forecast area is being generated by an Atlantic ridge stretching westward across the Keys. A ridge also extends westward across South Florida and the Keys This evenings sounding indicated some drier air through the lower levels to 1. Short Term Update - Ridging will continue across the Keys through the overnight period. A ridge across South Florida and the Keys along with a cooling mainland will result in winds increasing slightly to a gentle southeasterly breezes across all Keys waters.
Upper level ridge axis extended from the Northern Plains to the Four Corners. Subtropical/monsoon moisture plume was spreading northward underneath the ridge.
310 PM MDT Tue Jul 20 2021 Overview: A deep and expansive upper level ridge will prevail over the Rockies and central/southern High Plains throughout the short term period. Sensible Weather Conditions: With the Tri-State area situated in close vicinity of the aforementioned ridge aloft. A warming trend will begin in this period, with highs ranging from the upper 80s to lower 90s this afternoon and the lower-mid 90s on Wednesday. Models having some slight differences on the 500 mb ridge in place across the region in the extended outlook. Expect strong subsidence and hot temperatures under the ridge.