Aikyam-Lab/Synoptic-Bench huggingface dataset:
500 AM PDT Thu Jun 8 2017 A cooling trend will begin today as a low pressure system approaches the region. This will bring cooler than normal and breezy conditions for the weekend as the system moves through. Energy rotating around a northeast Pacific upper level low pressure system is bringing the beginning of a change in conditions across central CA. Temperatures will generally lower to around climo today as the cooler air begins to infiltrate the area, with northern portions seeing more significant cooling. As the low pressure system drops south from the northeast Pacific during the next few days, the cooling trend will continue through the weekend.
Showers and cooler than normal temperatures will continue through the weekend.
127 PM EST Fri Dec 29 2017 Canadian high pressure in the forecast area tonight will be reinforced behind a dry cold front Saturday night. Dry high pressure will ridge into the area from the north with low pressure pushing farther off the Southeast Coast through tonight. Leaned toward the lower temperature guidance because of the cold air mass with lows in the middle to upper 20s overnight. Broad upper trough remains over the eastern half of the country. We will see temperatures warm to near normal Saturday with warm advection in advance of a cold front. The NAM mos indicated highs in the lower 50s for the past few model runs while the GFS and ECMWF showed highs in the 55 to 60 degree range. A cold front will cross the forecast area Saturday night with limited moisture.
1014 AM MST Fri Dec 29 2017 Upper level analysis has broad trof across the eastern CONUS and weak ridging across the west. Cold air is shallow today, so temperatures in the higher Black Hills could warm into the lower 20s. Snow will taper off and end Saturday night as arctic high pressure pushes into the Northern Plains.
1255 PM EST Fri Dec 29 2017 Arctic high pressure will gradually weaken over the Carolinas through Saturday.
An increasing southwest wind will help the cooler areas catch up yielding a very pleasant afternoon. That southwest wind should prevent a return of the low clouds and fog tonight before another cold front arrives Saturday morning. The greatest impact of the front tomorrow will be in the Permian Basin and western Low Rolling Plains where the lower elevation will prevent a complete mixing out of the airmass.
Strong cold front will move through the area from late tonight into Saturday morning along with patchy areas of light freezing drizzle.
923 AM PST Fri Dec 29 2017 Sunny and warm today with inland temperatures reaching the upper eighties, then cooler for the weekend.
Skies over the island chain are partly cloudy in the Lower Keys and mostly sunny in the Middle and Upper Keys.
322 PM CST Fri Dec 29 2017 Very cold Arctic high pressure centered over Saskatchewan and Manitoba this afternoon will sink across much of ND and far northeastern SD by mid morning, while extending a ridge over the rest of the forecast area.
255 PM CST Fri Dec 29 2017 A cold front was just north of GCK-RSL-MYZ line as of 21z.
1137 AM CST Fri Dec 29 2017 VFR at LBB and PVW may collapse to IFR in stratus by early Saturday morning following a cold front, but confidence in this stratus remaining fully intact on the Caprock is a bit shaky at this time.
329 PM EST Fri Dec 29 2017 Arctic high pressure will build toward the region through Saturday.
Winds behind trough axis will be westerly, so any additional snow showers will be confined to the lee of the lakes. It still looks like the ridges will see the most snowfall. Additionally, orographic driven snow will also fire along the ridges, as winds aloft become more optimal and the snow growth zone rushes toward the surface.
High cloudiness continues to move through Norcal as the upper trof moves closer to VCRISL today. This has flattened the ridge some over our area and led to some enhanced lee-side cirrus over the Coastal Range for awhile early this morning. JHM Dry and mild temperatures continue today as upper level ridging continues to dominate. A weakening cold front now appears like it will stall out and fall apart over far Northern California. Have removed a slight chance of precipitation for northern Shasta County, with just an increase in cloud cover expected and slightly cooler temperatures.
This evening, areas of fog may develop across southwest Oklahoma and western north Texas as winds decrease ahead of a strong cold front. A little unsure about freezing fog or what impact the fog may cause as temperatures fall below freezing in west central Oklahoma by midnight. Perhaps enough lift will occur that patchy freezing drizzle may develop late tonight into Saturday. Enough cooling across roughly the northern half of Oklahoma may result in mainly snow with better chances of freezing drizzle across southern Oklahoma and north Texas.
210 PM EST Fri Dec 29 2017 Hydro One area of low pressure was tracking through the region early this morning leading to snow.
For the rest of this afternoon and overnight, generally few problems with light winds throughout, and only some VFR low clouds late tonight developing ahead of a cold front. Immediately after the cold front there will likely be OVC conditions from then thru the end of the forecast.
117 PM PST Fri Dec 29 2017 Sunny and warm today with inland temperatures reaching the upper eighties, then cooler for the weekend.
1148 AM CST Fri Dec 29 2017 Freezing drizzle is expected to develop later today into tonight, impacting much of the forecast area. Temperatures north of the MO River will solidly be below the freezing mark at the surface, with widespread teens and 20s expected. South of the river, warmer temps look to reside here with highs hovering right around the freezing mark. Despite the widespread sub-freezing temps expected today, the cause for the freezing drizzle is due to the combination of a low-level saturated layer that will reside outside of the favorable dendritic growth zone, inhibiting ice crystal formation for precip to fall as snow rather than the freezing drizzle expected.
153 PM EST Fri Dec 29 2017 A low pressure system and cold front approach tonight, and then cross on Saturday. Warm advection / isentropic lift ahead of a low pressure system approaching from the west, will bring snow across northern and central portions of the area tonight. As the associated cold front crosses Saturday, the snow will transition to mountain snow showers, with west winds increasing and becoming gusty, ushering in yet another arctic air mass, beginning Saturday afternoon.
352 PM EST Fri Dec 29 2017 A trough of low pressure will push east of the region this evening and weak high pressure will build over the area overnight. Weak low pressure will pass out to sea south of New England on Saturday.
1227 PM EST Fri Dec 29 2017 Arctic high pressure will build toward the region today through Saturday.
344 PM CST Fri Dec 29 2017 Latest surface analysis showed a 1029mb high over Indiana with the associated ridge axis southwest to northern Louisiana and an inverted was located along the lower and middle Texas coast. Upper air analysis showed the main broad trough over the east half of United States and northwest to west flow over Plains and Mississippi Valley. Inverted trough along the Texas is expected to deepen Saturday and Saturday night.
It is unlikely to make it to Hamilton, however, that will be moot anyway, because even if it doesn't flash freeze with the arctic air temperatures tonight could fall towards freezing and cause icy conditions.
1252 PM EST Fri Dec 29 2017 Dry high pressure is expected to build across the region today and remain through Saturday.
248 PM EST Fri Dec 29 2017 After another cold night, a low pressure area will move east out of the Great lakes and bring light snow to New York and Pennsylvania Saturday.
200 PM MST Fri Dec 29 2017 High pressure remains to the west with a northwest flow overhead.
A cold front preceding this high is forecast to sweep across the Tennessee Valley during Saturday, ushering Arctic air southward over the eastern lower-48.
258 PM CST Fri Dec 29 2017 A cold front was just north of GCK-RSL-MYZ line as of 21z.
A cold front will move down through the area Saturday. Low level moisture has increased with the westward surge and brought dewpoints into the lower to mid 30s into the central Permian Basin. There is still dense fog, but think temperatures will remain above freezing so have changed the Freezing Fog Advisory to a Dense Fog Advisory in Martin, Midland, Ector, Crane and Upton counties. Freezing fog is being reported at several observation sites farther north and west, and we still expect conditions to deteriorate into Eddy County in New Mexico, so will leave the Freezing Fog Advisory in affect until 29/16Z.
1252 PM EST Fri Dec 29 2017 A low pressure system and cold front approach tonight, and then cross on Saturday. Warm advection / isentropic lift ahead of a low pressure system approaching from the west, will bring snow across northern and central portions of the area tonight. As the associated cold front crosses Saturday, the snow will transition to mountain snow showers, with west winds increasing and becoming gusty, ushering in yet another arctic air mass, beginning Saturday afternoon.
Arizona is on the eastern flank of a strong late December upper high which is centered of the southern California coast this morning. The center of the high will gradually push east over Arizona in the next 24 hours and then be centered over northern Chihuahua Saturday night.
110 PM EST Fri Dec 29 2017 Arctic high pressure will gradually weaken over the Carolinas through Saturday.
358 PM EST Fri Dec 29 2017 A broad area of low pressure located over the Great Lakes today will progress to the east and it should pass off the Northeast coast late on Saturday.
1239 PM EST Fri Dec 29 2017 Aviation One area of low pressure was tracking through the region early this morning leading to snow.
947 AM PST Fri Dec 29 2017 Sunny and warm today with inland temperatures reaching the upper eighties, then cooler for the weekend.
The system, now over Vancouver Island will move across southern BC today, with a trailing cold front. This cold front will weaken considerably as it moves across the region tonight. As the cold front moves through tonight, a threat of very light freezing rain exists across the lower valleys overnight. Cold frontal passage tonight will bring snow to the mountains with rain/freezing rain and snow possible in lower valleys.
The back edge of the snow is across SE SD at this time and should see significant push of dry air into the state in the next few hours which should allow much of snow to taper off from northwest to southeast with the strong push of cold air moving in behind the cold front as well. In the far south, getting low level saturation and no ice introduction so have several reports of light freezing drizzle across the far southwest into south central Iowa.
Once winds taper by sunset, attention will turn to a strong cold front currently dropping across the High Plains of CO and KS. This pattern should support another round of morning stratus and some freezing fog behind the front over much of the area, but clouds are likely to loiter for most/all of the day as chilly surface ridging holds tight and prevents upslope winds from veering too much. By Saturday night, broad troughing in NW flow to our north will release a legitimate Arctic airmass towards the TX Panhandle, before reaching the South Plains near daybreak.
Moisture plume and subfreezing temperatures continue to affect an area north of a line from White Swan Wa to Hermiston to Walla Walla. Downsloping is limiting the freezing rain across portions of Yakima County. Winter Storm warnings continue until noon for Kittitas, Yakima valleys and the lower Columbia Basin of Washington. Plus a cold front will sweep through the area overnight and bring a drier air mass for Saturday into Saturday night. KBDN and KRDM should be VFR with sct- bkn 050-100kt till 03z, with sw winds 15-25kts, may see MVFR cigs 03z-06Z as cold front and light rain moves through.
139 PM PST Fri Dec 29 2017 Sunny and warm today with inland temperatures reaching the upper eighties, then cooler for the weekend.
Some patchy drizzle may also develop late tonight, but left any mention out of the tafs, given the low confidence.
330 PM EST Fri Dec 29 2017 Another foggy night is possible ahead of a relatively dry cold front that will push across the area on Saturday leaving drier air in its wake to close out 2017.
On Sat night, a cold front sweeps through and brings overnight low temperatures crashing to slightly below seasonal normals. Some breezy conditions Sat in the Snake River plain will accompany the cold front.
341 PM CST Fri Dec 29 2017 A ridge of high pressure continues to be located to our north, while a cold front is across the central Plains states, and a frontal boundary is across the southern Gulf of Mexico. A weak wave or trough of low pressure is trying to develop off the south Texas coast, and it will move up the Texas coast tonight, eventually bringing scattered rain showers into southeast Texas after midnight tonight or tomorrow morning. This system will stall out over our coast, keeping rain chances in the forecast Saturday and Saturday night, before a strong high pressure system starts to move south out of the northern Plains, and pushes it back further out in the Gulf.
350 PM CDT Sun Jul 23 2017 As advertised, a somewhat cooler and drier airmass continues to build south across the region today with temperatures ranging from the middle 80s in northeast Nebraska to the lower 90s in far southern reaches of the forecast area.
103 PM EDT Sun Jul 23 2017 Upper level ridging will weaken across the area today as the upper level trough digs over the eastern US. Temperatures have risen into the low to mid 90s across the area and with dewpoints in the low to mid 70s heat index values currently range between 100 and 105. The upper level trough will continue digging across the eastern states tonight through Monday. With the freezing level above 15 kft expect the main threat from thunderstorms to remain damaging wind gusts. High temperatures on Monday should reach the low to mid 90s with overnight lows in the mid 70s.
521 PM EDT Sun Jul 23 2017 High pressure remains off the southeast coast.
Temperatures have also remained a bit cooler today to the north. The cold front to the north will drop south tomorrow afternoon/evening and may allow a few showers or storms to pop up along the boundary at that time. As the cold front sinks to the south tomorrow evening, dry weather will be seen through Monday night. Height rises At the surface, a boundary should continue pushing south of the area with high pressure expected to be centered across the Great Lakes region and Ontario and building into the region.
312 PM CDT Sun Jul 23 2017 A ridge of high pressure will move overhead tonight, and east of the region by Monday afternoon.
A cold front crosses tonight, and then another crosses Monday night. High pressure midweek. Behind the front, high pressure will take its place.
350 PM CDT Sun Jul 23 2017 Isolated to scattered thunderstorms have developed near a cold front which is slowly sinking southward through Missouri and Illinois. Highs tomorrow will be 5-10 degrees cooler across the area except over the eastern Ozarks where temperatures will likely be similar to what they were today. Light ely flow and a mostly clear sky shud allow for ample radiational cooling and have trended aob the cooler guidance. With sfc winds becoming more sly on Tues and the upper ridge building into the area, temps shud warm up quickly. Much cooler conditions currently expected with 850mb temps in the 12C to 14C range. Widely scattered showers and thunderstorms are expected to develop near a cold front as it moves through Missouri and Illinois, but it is not clear whether these will affect the terminals.
111 PM CDT Sun Jul 23 2017 1248 PM CDT Compact and digging upper trough over the upper great lakes will continue southeast tonight. Height falls on the back side of the trough will provide enough forcing ahead of a cold frontal boundary to trigger scattered showers and thunderstorms during the peak heating period this afternoon/early evening. The thunderstorm concerns will end quickly this evening as these combined factors all shift southeast with the arrival of the cooler and drier airmass behind the frontal boundary and increased surface pressure ahead of large high pressure across the upper midwest.
1210 PM CDT Sun Jul 23 2017 Today's temperature forecast is quite challenging as there are several competing elements that if one is weaker than the other or vice versa then temperatures could be much warmer, or not as a bad as it has been. Second, where the cloud cover moves out earlier in the day, likely the northern half of the forecast area, highs should climb into the low to middle 90s. But, a secondary cold front will be moving into the area from the north and may get into northern MO before peak heating, limiting their potential warm up. Should this slow down then the northern counties will be in the lower to perhaps middle 90s.
Dry weather is then expected overnight and on Monday as high pressure builds into the region. The lack of sunshine along with cooler temps aloft will result in below normal high temps in the low to mid 70s.
256 PM MDT Sun Jul 23 2017 There is a nearly stationary flow this afternoon and evening with the upper ridge centered over the Great Basin and central Rockies. On Monday the upper ridge will be centered over New Mexico and west Texas, with weak west to southwesterly flow aloft over the cwa.
Have gone on the high side of guidance (warmer than most all options), thinking we'll be well above 100 west (104-105), and in the mid and upper 90s east. The drier air will keep pops minimal tonight, and despite the upper level low tracking across the region, it should not have any moisture to tap into.
Temperatures have also remained a bit cooler today to the north. The cold front to the north will drop south tomorrow afternoon/evening and may allow a few showers or storms to pop up along the boundary at that time. As the cold front sinks to the south tomorrow evening, dry weather will be seen through Monday night.
146 PM EDT Sun Jul 23 2017 Aviation Low pressure passing through the state today will bring scattered showers and thunderstorms.
219 PM MDT Sun Jul 23 2017 Pretty quiet and hot weather pattern will be in place through Monday with strong ridging aloft and limited monsoonal moisture. The pattern will be similar for Monday with ridging/subsidence aloft keeping tstm chances rather limited. Not expecting much convective initiation along the trough except in areas near the southern Laramie Range.
328 PM CDT Sun Jul 23 2017 (Tonight and Monday) Thunderstorms will continue through this evening as a weakness of low pressure continues in the upper levels. Upper level high pressure will gradually strengthen tomorrow, however can't rule isolated showers and thunderstorms developing tomorrow.
Over the next few hours and into the evening, the showers and storms in our southern tier should be decreasing, while activity to our north near a pre-frontal trough should be increasing. Tomorrow the surface convergence zone and 850 mb theta-e front will be to our south, leaving a NW flow through the low and midlevels, which should keep the convection mainly south. There will be a cold front across the Ohio River that will be moving into KY, but moisture and instability ahead of it looks unfavorable for much development or any severe threat.
214 PM MDT Sun Jul 23 2017 Latest upper analysis shows a ridge over much of the western CONUS with and upper trough digging southward into the Pacific Northwest. On Monday, the upper ridge will build eastward over the high plains with the thermal ridge peaking over the forecast area ahead of an upper low and associated trough crossing the Canadian prairie provinces.
This will be coupled with a trough moving onshore from the Pacific.
605 PM EDT Sun Jul 23 2017 A stagnant mid-level trough will keep very humid conditions over the region through Monday with a continued threat for showers and thunderstorms.
A weak southeasterly low-level flow prevails across the Florida Keys and adjacent coastal waters, on the southwestern flank of a deep subtropical anticyclone centered over the western North Atlantic. The associated low-level ridge is just north of the Florida Keys, while the mid-level ridge remains just south of the Straits of Florida. The Atlantic subtropical anticyclone will be the dominant weather system for Florida Keys weather this week.
105 PM CDT Sun Jul 23 2017 It appears that temperatures will be slightly cooler today across parts of southwestern Illinois, which will keep the heat index values lower than previously anticipated. This boundary will be the main front that will bring cooler, drier air, so will still be dealing with excessive heat today for areas along and south of Interstate 70, so no changes to ongoing heat headlines.
332 PM CDT Sun Jul 23 2017 Isolated showers and thunderstorms were developing across northern Illinois as of 230 PM as a trough pushed across the Mississippi River. Ahead of this trough, dew points were in the lower to mid 70s while behind it dew points were in the mid to upper 60s. temperatures ranged from the lower 80s northwest of a line from Cedar Rapids to Dubuque with the lower 90s across northeast Missouri. Dry and cool air advection will move into the area as high pressure builds from the Northern Plains into the Upper Midwest Sunday night. Expect noticeably cooler overnight lows with temperatures slightly below normal. High pressure will remain to the northeast of our area across Wisconsin with winds turning to the northeast and advecting in cooler air off of Lake Michigan for the day on Monday.
Some of the thunderstorms associated with the trough could become strong or even severe but most of this activity is expected to stay just northeast of the area.
525 PM EDT Sun Jul 23 2017 Upper level ridging will weaken across the area today as the upper level trough digs over the eastern US.
Upper air data and satellite imagery showed an inverted trof lying over the forecast area mainly from Tucson south across Sonora MX.
547 PM EDT Sun Jul 23 2017 A ridge of high pressure will gradually shift offshore into the maritimes tonight into Monday. Low pressure will approach from the southwest later tonight and Monday and will deliver cooler temperatures and the likelihood of rain in an onshore flow.
152 PM MDT Sun Jul 23 2017 Latest upper air data shows the ridge over the Central Rockies. At the surface a high pressure was moving east out of the Tri-State Area. Monday will continue to be dry as the ridge builds over the Central Plains and an upper level short wave trough tracks over the Northern Plains. Highs will be warmer than today by a few degrees.
We are still expecting the ridge of high pressure to begin to break down overnight and tomorrow.
1217 PM CDT Sun Jul 23 2017 Clusters of showers/storms should continue to gradually shift south and become less numerous this morning, along and ahead of a 700-500 mb trough axis.
318 PM CDT Sun Jul 23 2017 As of 19z, a weak cold front was positioned from central OK into northeastern AR. Upper level ridging continues to organized across the Rockies. Td's in the eastern half of the CWA remain in the low to middle 70s, resulting in heat index values approaching 100. WAA will return Monday morning across the western half of the area, as the high pressure shunts eastward, allowing southeasterly winds to return.
More concerning is a cold front moving into western ND Monday afternoon. This feature is associated with a stacked low pressure system moving from central Alberta eastward into central Saskatchewan. Most of the energy with this system should reside in Canada, but enough instability with projected CAPE values over 2000 J/Kg along the surface cold front for SPC to continue a marginal risk for severe storms over ND. Along and ahead of the cold front we expect temperatures to climb into the 90s across western and most of central ND, with upper 90s in the southwest.
250 PM EDT Sun Jul 23 2017 High pressure remains off the southeast coast.