Aikyam-Lab/Synoptic-Bench huggingface dataset:
300 PM EST Sat Nov 26 2016 High pressure will extend across the region into early week. High pressure will shift east tonight. High temperatures will peak in the lower to mid-60s. Anticipate increasing cloud cover late Sunday night ahead of the developing low pressure system, which introduces uncertainty with overnight temperature drops.
High pressure lies across the Northern Gulf Coast and the Lower Mississippi Valley this afternoon. Aloft, a ridge is building in from the west while a trough is pushing across the Pacific Coast. The low clouds are burning off now but highs will not have enough time to warm out of the 50s at some locations. Sunday will be dry, however the ridge will become centered east of the area allowing the return flow to begin ahead of the next system. Also on Sunday, The upper trough will move across the Rockies with low pressure developing in the plains.
235 PM CST Sat Nov 26 2016 Latest 20z surface analysis shows ridge over the Ohio River Valley. Another potential concern tonight is the low temperatures. Due to this, raised the low temperatures up into the lower 30s. With upper level trough digging over the western United States and upper level ridge amplifying over the Great Lakes Region. southerly winds aloft will continue to advect a warmer airmass into the forecast area Sunday.
As the upper low ejects into the Central Plains there looks to be just enough instability that some thunderstorms may be possible in the afternoon hours.
326 PM CST Sat Nov 26 2016 Short wave ridging currently overhead will move east tonight as sharp long wave troughing moves farther into the western CONUS. Tonight, however, strong low level moisture will be advected northward into the region ahead of this trough. This will continue the low stratus we have seen all day today. A lead short wave trough within the long wave will move out from the four-corners into the central Plains on Sunday. Surface lee cyclogenesis over eastern Colorado will drag a Pacific cold front/dryline through the area during the daytime.
This will help bring in warmer temperatures on Sunday afternoon along with low relative humidity.
The cloudiness will not allow for much if any low level instability to develop, but mid level instability will be present, and as forcing increases from the negatively tilted upper trough emerging into the central plains, anticipate a round of showers and thunderstorms to develop. Otherwise, temperatures will be cooler Sunday due to the increase in cloud cover.
Given strength of the 700 mb flow (35-45 kts), expect snow to become heavy over favored west facing slopes and will hoist a winter storm warning for the higher peaks of the San Juans (zone 68). Downslope winds will tend to keep temps rather mild and kill precip east of the mountains overnight, with many lower elevations staying above freezing.
216 PM MST Sat Nov 26 2016 Water vapor shows broad upper ridge over the nrn plains, resulting in sunny skies and temps well into the 50s early this afternoon. Strong upper trof pushing onshore the west coast will bring big changes over the next few days.
water vapor imagery shows upper level trough centered just offshore this morning. The upper level trough and cold front will move through the region this evening and overnight with rain and mountain snow. An upper trough along 130W longitude will gradually shift east towards the west coast today. This trough will elongate and split as it moves onshore and through the region tonight into Sunday.
This will persist through the overnight period even as the ridge slides east and will bring cooler air to the region. Weak upper ridge sliding across Sunday won't do much to warm the area other than possibly a degree or 2. At the same time, a split trough coming in the the Pacific Northwest will partially merge before an eastern piece shoots off to the northeast.
345 PM CST Sat Nov 26 2016 High pressure across the region will keep skies mostly clear and winds light. Don't worry, if you are not a fan of the freezing temps, a warm up is on the way. On Sunday, as high pressure moves eastward, winds will become southerly by the afternoon and cloud cover increases ahead of our next system.
339 PM CST Sat Nov 26 2016 A weak mid-level ridge was in place across the central U. and low pressure over the High Plains. This afternoon a mid-level trough moved into the western U. , and models show this trough quickly advancing eastward toward the Rockies tonight into Sunday. Southerly winds will remain sustained at 10-15mph as the low-level jet remains centered over the area. As a result, the low temperatures may occur near midnight tonight with temperatures remaining steady or rising slightly overnight into Sunday morning. Models show the low-level jet increasing through the day, especially during the afternoon/early evening hours, with 850mb winds of 50-60kts. expect scattered showers and isolated thunderstorms to persist through at least 6z as intense lift ahead of the upper low pivots across the area.
/Issued 455 AM EST Sat Nov 26 2016/ Progressive longwave trough moving east of the region early this morning with cooler/drier air sweeping across north and central Georgia. Temps range from the lower 40s north to the mid 50s south with northerly winds periodically gusting to 20 MPH. High pressure will gradually move east of the state tonight shifting northerly winds around to more of a easterly, and eventually a southerly direction by late Sunday.
Southwesterly flow will persist during the overnight hours then a weak cold front will make its way across the Northern Rockies on Sunday.
/issued 345 PM CST Sun Dec 11 2016/ Mid-afternoon sfc analysis shows high pressure centered along the East Coast while low pressure is noted over Oklahoma.
The mid level trough has exited northeast Wisconsin, and the band of light snow has pushed off to the east. A trough across Canada is approaching the upper Great lakes this evening. Also a trough/cold front will move through this evening. Forecast soundings saturate enough that will put flurries/snow showers in, despite the low PoPs. Lack of ice in the dendritic zone initially could result in freezing drizzle, but for now will go with just snow, since if this did occur it would be very brief. Then mid/low level moisture increases again this evening, with a trough/cold front.
1121 PM EST Sun Dec 11 2016 A low pressure system will eject northeast from the Plains into the Great lakes tonight. This will allow a cold front to move across the Ohio Valley Monday morning, ending precipitation across the area. Weak high pressure builds in Monday night, followed by a cold front on Tuesday. Temperatures have risen above freezing so have dropped advisory across all of our far northwest. After any early morning precipitation, high pressure builds in later Monday and morning clouds may break for some sunshine in the afternoon. High pressure weakens Monday night as a fast-moving, weak system reflected at the surface in the form of a weak cold front moves through on Tuesday.
1130 PM CST Sun Dec 11 2016 Ceilings have dropped into the low end MVFR - high end IFR range north of Highway 59. Frontal boundary is making decent southward progress thru ncntl Tx and still expecting this front to be situated roughly along the Highway 59 corridor by 6am. 8 PM temperatures in the lower 70s over mid 60 dew points is not exactly hot cocoa weather and a weak early Monday cold frontal boundary will do little to effect this recent warm wave. Tomorrow's post-frontal air mass will be relatively cooler/drier but.
Significant moisture remains confined to the lower levels, 800 mb and below so not anticipating any great rain makers. Dry weather pattern will then return for mid-week with much cooler temperatures incoming.
1030 PM MST Sun Dec 11 2016 Latest upper air analysis depicts a broad long wave trough over the CONUS. Within the trough is a smaller more subtle short wave trough moving onto the Central Plains. Ahead of this trough a band of snow had moved through the Tri-State Area leaving snowfall amounts of less than a half inch. Lows will be cooler than last night, falling to the upper teens. Monday will be dry and warmer as warm air advection increases. During the afternoon a pre- frontal trough will move into the northern part of the Tri-State Area, causing winds to turn to the northwest behind it.
Easterly winds this afternoon veer to the south tonight ahead of the cold front. While areas of fog are expected after midnight, the lower visibilities may hold off until early in the morning and continue after 12z. With the southerly flow and cloudy skies overnight, low temperatures will be significantly warmer than this morning (around 15 degrees warmer). This will result in lows in the lower 50s inland to mid 50s across the Florida panhandle and upper 50s to lower 60s along the coast. Near sunrise, with the fog and low clouds, may also see some drizzle associated with the low clouds. At the surface, a weak cold front will stall out just north of our area.
Some light snow or flurries are seen among the higher peaks but impact appears to be minimal with no snow occurring over Rabbit Ears Pass.
Still expect areas of light snow over the higher mountains given the strong orographic flow and some shallow moisture.
Surface analysis at 20Z showed an area of low pressure over central OK with a cold front extending north to a weak low over east central Iowa SW of Cedar Rapids. Through the rest of the night, the big question will be how long the low clouds linger as cold air advection ensues with brisk NW winds. Current satellite imagery shows the back edge of the low cloud cover eroding and pushing across far eastern SD and along the MO river in eastern NEB.
1210 AM CST Mon Dec 12 2016 A few breaks in the cloud cover have allowed temperatures to climb into the lower 30s in spots this afternoon. dropping into the lower teens in the coldest spots. Progressive west northwesterly flow is expected to continue through the extended periods with an initial blast of cold air expected behind a cold front Tuesday.
Late this afternoon a surface cold front, located from KY through northeast TX at 10 pm, will reach central GA and AL as it becomes oriented with the nearly zonal W-SW winds aloft. Thus we expect PoPs lowering from 20-30% this morning to less than 20% this afternoon, despite the approaching cold front from the northwest. Extensive cloud cover will (somewhat) limit high temperatures today, from the lower 70s in central AL and GA, to mid 70s elsewhere, except upper 70s around Cross City where there may be more breaks in the overcast.
304 AM CST Mon Dec 12 2016 Yesterdays cold front has pushed well south of the area at this time, with another shot of cold air settling over most of the region. As this warm front pushes north, moisture quality isnt all that great, with mainly low-mid clouds expected. The next cold front will reach I-70 late in the forecast valid period, switching winds to the north at RSL and SLN.
158 AM CST Mon Dec 12 2016 Clearing is spreading east into the forecast area this morning as drier air advects into the region behind a cold front. Clouds should come back in this evening ahead of the second cold front.
1245 AM EST Mon Dec 12 2016 A low pressure system will eject northeast from the Plains into the Great lakes tonight. This will allow a cold front to move across the Ohio Valley Monday morning, ending precipitation across the area. Weak high pressure builds in Monday night, followed by a cold front on Tuesday. Temperatures have risen above freezing so have dropped advisory across all of our far northwest. After any early morning precipitation, high pressure builds in later Monday and morning clouds may break for some sunshine in the afternoon. High pressure weakens Monday night as a fast-moving, weak system reflected at the surface in the form of a weak cold front moves through on Tuesday.
328 AM CST Mon Dec 12 2016 The first in a series of cold fronts has made its way south through the area with a cooler day on tap for today, but still near seasonal norms.
328 AM CST Mon Dec 12 2016 Our first of several weak cold fronts that will move through this week, continues to push south across the area this morning.
1242 AM EST Mon Dec 12 2016 A cold front will move east across our area early this morning bringing precipitation to an end, however, a few lake effect snow showers may develop over southwest Michigan as the colder air moves in. High pressure will move across the Midwest Monday providing fair weather.
It will be a cooler day than the warm day yesterday, however it will be closer to average so not too bad.
Patchy dense freezing fog is occurring in portions of the Basin in Washington and the Yakima valley.
The low clouds have cleared out at the northeast Oklahoma TAF sites. Cold front is just clearing the far eastern portions of the forecast area with preceding light showers also shifting east of the area.
At the same time a deep closed cyclone over the Canadian Prairies will drop southeast toward the border allowing for a strong cold front to sweep through the CWA starting late this afternoon, and clearing the area after midnight.
111 AM EST Mon Dec 12 2016 Rain showers are moving in ahead on an approaching cold front. The cold front will move through the terminals around 17-18z with improving conditions beyond this timeframe.
Models spread rain northward into Middle Tennessee during the day on Tuesday then work it rather quickly eastward as another cold front moves in from the west booting surface wave off to the east and taking the rain with it.
1004 PM CST Sun Dec 11 2016 Scattered showers continue to develop ahead of a cold front just now entering our extreme northwest zones as of 04Z. Cold front will continue to shift across the region overnight with scattered showers still occurring out ahead of the front through Monday morning. Showers and areas of drizzle are expected to develop along a cold front as it moves across the area during the overnight/early morning hours.
1127 PM CST Sun Dec 11 2016 Warm air advection continues ahead of a slowly progressing cold front, which is currently located across northwest and north central Missouri. As this cold front progresses eastward it will bring some slightly drier air into the lower levels, which will cause some improvements to the lowered visibility caused by the drizzle. Precipitation chances will end from west to east with the passage of the cold front. While no impactful meteorological issues should arise, lingering moisture on area roads, mainly bridges, could refreeze as temperatures plummet tonight. Despite the cold frontal passage, Monday will bring near-normal high temperatures, with max temperatures in the 40s.
Monday morning additional IFR will be seen over central and southern AR, while areas of VFR will be seen over northern AR as a cold front gradually moves through the area. Winds will be from the south at 5 to 10 mph ahead of the cold front, then become northwest at 5 to 15 mph behind the front. Trough remains caught up in the flow and is still expected to move across the northern tier of states tonight through Monday. Attendant cold front is located in the central plains and will move across the state during the overnight hours.
334 AM CST Mon Dec 12 2016 Light snowfall accumulations this morning and wind chill headlines top the highlights in the short term period. Latest water vapor imagery loop shows a deep upper low west of Hudson Bay which will continue to sag southeast with time, reinforcing the arctic air in place across the northern high plains. Bufkit model soundings suggest something closer to the CONSMOS which places the highest sustained winds across the north and weaker winds in the south. Not a real strong signal in cold air advection overlapping the location of the strongest isallobaric forcing, which the high resolution models suggests will reside from southeast Montana into western and central South Dakota.
This shouldn't really amount to too much, and temperatures are expected to remain above freezing while it falls. A considerably colder airmass will build into the area on Tuesday behind a passing cold front. This fropa will set the stage for several days of cooler than average temperatures, with lows in the teens and 20s and highs in the 30s.
light snow continues along the Continental Divide this afternoon with wind still gusting to near 50 mph over the higher terrain. Mozley West to northwest upper flow across the area Mon night into Tue, with continued light snow chances over the higher peaks along the Continental Divide into Tue afternoon. As a result, max temps over much of the east will be much colder, and areas near the KS border will likely stay below freezing. Cold air then retreats Thu as flat upper ridge migrates across southern Rockies, and expect a big increase in max temps along and east of the mountains. Tomorrow evening, after 00z, a shallow arctic cold front will push south through the plains.
A weak cold frontal boundary will drift south into that area during the post- Midnight hours, with light north post-frontal winds allowing for an infiltration of drier low-level air. Southwest winds continue to decrease early this evening, and will shift to north with a weak cold frontal passage tonight. At KABI, the cold front will arrive around 630 PM, and winds will be gusty (gusts over 20 knots) for a few hours after the frontal passage. The front will usher in a drier and slightly cooler airmass for Monday.
As of mid afternoon, a surface analysis showed low pressure over Iowa with a warm front extending through central Illinois and Indiana. Overall, this system will bring another good round of beneficial rain to the area with totals expected between 1/2 and 1 inch with the highest amounts falling across south-central and southeast Kentucky. For Monday, the cold front will cross the region early in the morning, reaching a Bowling Green to Lexington line by sunrise, and then moving out of the area.
The remainder of the area may see some stratus move in from the north/northeast as winds shift to the northeast associated with a cold front.
Pops will increase from the NW late tonight as a cold front nears the CWFA. So, have lingered the highest pops in the vicinity of the I-20 corridor through Monday afternoon.
With the high center positioned south of the CWA, just enough of a gradient remains in place overnight, thus allowing a bit of a breeze to be maintained. Otherwise, the rest of the short term is quiet and dry, with just the very cold temperatures remaining in place as arctic high pressure continues building southeast into the region.
150 AM EST Mon Dec 12 2016 High pressure along the Mid-Atlantic coast will move out to sea tonight as a cold front crosses the Plains into the Mississippi River Valley.
A cool Pacific Trough resides off the coast of British COlumbia with a ridge developing over the Aleutians and Alaska.
light snow continues along the Continental Divide this afternoon with wind still gusting to near 50 mph over the higher terrain. Mozley West to northwest upper flow across the area Mon night into Tue, with continued light snow chances over the higher peaks along the Continental Divide into Tue afternoon. As a result, max temps over much of the east will be much colder, and areas near the KS border will likely stay below freezing. Cold air then retreats Thu as flat upper ridge migrates across southern Rockies, and expect a big increase in max temps along and east of the mountains. Tomorrow evening, after 00z, a shallow arctic cold front will push south through the plains. KCOS and possibly KPUB could get in on the low clouds tonight and again Monday evening.
1211 AM EST Mon Dec 12 2016 A low will move northeast across the Great Lakes through Monday pulling a cold front across the area. An arctic cold front will push east through the region late Tuesday.
Anticipate the low clouds to dominate although VSBY will lower toward sunrise. The warmer and more humid air will continue to advance northward, but a shallow stable layer near the surface will likely prevail resulting in widespread low clouds and eventually some fog.
Strong Canadian low pressure system is dragging a cold front into the region. Quick-moving snow showers associated with the cold front/upper wave will pass through northwestern SD this morning, producing up to an inch of snow. Breezy northwest winds behind the cold front may cause some blowing snow there as well. Chances for snow across northwestern SD will diminish this afternoon as cold high pressure sinks into the region; however, there may be some upslope snow showers over the Hills, as well as an area of light snow over the southwestern CWA where the baroclinic zone is collocated with some moisture and upper divergence. With high pressure over the region, Tuesday will be dry except for the possibility of light snow showers over the Hills.
Scattered showers will only be on the increase heading into the evening hours, as the atmospheric column more fully saturates in advance of an approaching cold front. The cold front will reach our northwest doorstep by around 03Z, be on the Ohio River/crossing around 06z, and make its final push east of the Lakes and out the FA between 09-12Z. After the front's departure, High pressure will work in overhead, literally. Another weak front, or trof of lower (relative) pressure, will make passage Tuesday, but it will be moisture starved between the departed High (now to the East) and another High (incoming from the northwest).
158 AM MST Mon Dec 12 2016 Latest upper air analysis depicts a broad long wave trough over the CONUS. Within the trough is a smaller more subtle short wave trough moving onto the Central Plains. Ahead of this trough a band of snow had moved through the Tri-State Area leaving snowfall amounts of less than a half inch. Lows will be cooler than last night, falling to the upper teens. Monday will be dry and warmer as warm air advection increases. During the afternoon a pre- frontal trough will move into the northern part of the Tri-State Area, causing winds to turn to the northwest behind it.
Winds will be lighter than over the weekend, as the general flow pattern weakens along with the pressure gradient as high pressure to the north continues to slide east towards the western Atlantic. Relatively tranquil period of weather is expected during the short term period as high pressure to the north and east influences the weather across South Florida. Despite the influence of the high pressure, there will still be a few weak boundaries lingering across the area helping to pool enough moisture in the low-levels, with PWATs continuing to hover near record levels, to allow for isolated to widely scattered showers despite drier midlevel air. Temperatures will be above normal, with highs in the lower to mid 80s and lows in the 60s to near 70.
Otherwise, high pressure will shift off to the east. The above mentioned front will bring in cooler highs for Tuesday.
Low will track eastward overnight, with cold front trailing behind it. Monday Through Monday Night An upper wave associated with a 140kt jet streak will cross the CWA Monday with a cold front pushing through the area.
1118 PM CST Sun Dec 11 2016 A longwave trough of low pressure aloft remained entrenched across the lower 48 this morning. At the surface, low pressure was located over southern Iowa with a cold front extending to the southwest into southwest Oklahoma and the Texas panhandle. Along the SDak border, highs will remain in the upper 20s as a cold front arrives early afternoon.
1159 PM CST Sun Dec 11 2016 For the 12/06z TAFs, a cold front was approaching the Interstate 30 corridor at the start of the period. /issued 1004 PM CST Sun Dec 11 2016/ Scattered showers continue to develop ahead of a cold front just now entering our extreme northwest zones as of 04Z. Cold front will continue to shift across the region overnight with scattered showers still occurring out ahead of the front through Monday morning.
425 AM EST Mon Dec 12 2016 A cold front over our area this morning will move to the east by this afternoon. Generally dry conditions are expected today, though some patchy freezing drizzle or light snow is possible over northern portions of the area this morning.