Aikyam-Lab/Synoptic-Bench huggingface dataset:
329 AM EST Tue Dec 6 2016 Low pressure is expected to spread precipitation across the region Tuesday.
With temps being below freezing in northeast areas currently, the slight chance of freezing rain is still warranted, so will be leaving it in the wx grids. The remainder of today through tonight will be dry as the weather system quickly moves east and a high pressure ridge builds into the area tonight from the west. Skies should scatter out and then clear tonight as the ridge moves in. Clear skies and high pressure building in will cause temps to drop well below freezing, reaching the lower to mid 20s across the area.
Meanwhile cold front working its way into northeast OK at present will continue to push southeast through the day bringing an initial surge of cooler air.
Looks like there will be some periods of ifr and lifr weather through the early part of the forecast as a strong short wave trough makes progress from the Lower Mississippi Valley across the Southern Appalachian region.
Low ceilings and visibilities will continue to develop and affect parts of the area until a cold front moves across the area.
An upper low will continue to trek across the Northern Plains dragging a cold front across the forecast area.
/issued 830 PM EST Mon Dec 5 2016/ Southeast winds will continue to veer more southerly tonight advecting warmer air into South Florida tonight. Latest water vapor imagery shows low pressure system centered over southwest Texas will travel east-northeast across southeast plains tonight into Tuesday.
09z H5 analysis reveals an upper level low embedded in southwesterly flow located over northeast Louisiana, with ample moisture present locally. Surface temperatures range from the lower 40s across northeast Arkansas this hour to the upper 50s across portions of northeast Mississippi.
A cold front will then pass over the region later this afternoon with northwest winds increasing to 10-15 MPH while low clouds remain entrenched across the TN/MS Valleys. The main impact for tonight will be the low clouds that may drop further (towards 1000 feet) which could create a visibility issue with fog over the higher elevations of northeast AL/southern middle TN. Low dewpoint depressions in the low-levels may also be an ingredient for the fog.
The primary interest in the short term period is the drop in temperatures following the initial cold front expected to sweep quickly through the area this evening. The cold front will bring colder temperatures and gusty northwest winds, but no precipitation as the area will be under an area of mid level subsidence with a dry airmass in place in the wake of a short wave trough aloft tonight.
Some areas of clouds earlier this evening have now become less abundant, with the high clouds across far southern Utah continuing to shift farther south while a band of stratus over portions of central/northern Utah is gradually thinning. These clouds are in advance of the next trough which will sag into the area tomorrow. Increasing instability owing to colder air aloft accompanying the trough and some lift associated with an upper jet punching into Utah will lead to the development of snow tomorrow afternoon through tomorrow night mainly across northern/central Utah.
243 AM CST Tue Dec 6 2016 Low pressure tracking northeast from the TN River Valley into the upper OH River Valley region will continue to bring scattered to numerous showers to much of the region early today. The precip will begin to taper off from west to east during the morning as the low exits the region.
The early morning cloud cover across far east central Kansas finally cleared out by early this afternoon, so the combination of clear skies and breezy southerly winds allowed afternoon temperatures to rise into the low/mid 50s. A mid-level trough was noted across the Northern Plains and it will progress eastward toward the Great Lakes region tonight through Tuesday. However, these winds will still usher cooler air into the region with high temperatures cooler than the seasonal normals with readings in the upper 30s to low 40s. Northwest winds will be ushering in colder air through the night allowing temperatures to drop into the low 20s.
1042 PM CST Mon Dec 5 2016 Strong cold front moving through the area this evening.
Sfc cold front has moved through all terminal sites with windy conditions behind it. /Issued 930 PM CST Mon Dec 5 2016/ Surface winds behind cold front moving southward across the forecast area this evening are stronger than earlier grids and text forecasts had going. /Issued 615 PM CST Mon Dec 5 2016/ For the 00Z TAFs, a cold front will move across the terminal sites this evening with gusty north winds in its wake.
Expect these conditions to continue overnight before stratus begins to advect northward from the coast along and ahead of an advancing warm front. As the warm front advances through Sunday morning, southeasterly winds will be increasing to 10-15 kts with higher gusts from 20-25 kts for the afternoon hours. This will be occurring ahead of an approaching upper level trough and a cold front over TX/OK with widespread showers and thunderstorms forming ahead of these features by late morning into early afternoon over East TX and farther east by mid to late afternoon through evening.
A short wave trough will move across the region tonight and Monday bringing a small threat of precipitation to the Sierra and Foothills north of Kern County along with a return to windy conditions across the Kern County mountains and desert.
420 AM EDT Sun Apr 2 2017 Low pressure over the western Atlantic this morning continues to pull away while high pressure builds east from the Ohio Valley.
A dry cold front will move through the area on Monday, resulting in cooler weather along with breezy conditions.
About this time, the H5 trough rotates through the region, with the RR quadrant of the midlevel jet moving across Deep South Texas. HRRR/RAP indicating CAPE values in the lower valley in excess of 3500 for this small window, so any thunderstorms that finally develop would get strong quickly. The H5 trough sweeps offshore by 6z, forcing the dryline/front back offshore and restabilizing the entire area. The remainder of the period after midnight tonight into tomorrow will be very stable with high pressure sfc and aloft.
332 AM CDT Sun Apr 2 2017 Strong upper low over Northern Mexico this morning will move across the region today with center passing over the Big Bend. tonight this low will lift across North TX passing into OK by morning.
407 AM CDT Sun Apr 2 2017 H5 analysis from earlier this evening is highlighted by a closed low over western New Mexico and eastern Arizona with a trough extending south into northern Mexico. East of the low, a low amplitude ridge extended from southern Alabama into Iowa. West of the trough, low amplitude ridging extended from central California into southern Idaho. Readings as of 3 AM CDT were generally in the lower 40s with the exception of Ogallala and Imperial which were in the upper 30s. That being said, limited highs to the lower 60s today.
The forecast area has been primarily under the influence of the energetic southern stream and affected by a series of cyclones tracking northeast from the trough position over the Desert Southwest. Temperatures will start the period above normal, fall to below normal for a few days as two strong cyclones track south of the area, then rebound late. Expect temperatures to be a little warmer tonight as clouds increase during the night. Thickening clouds on Sunday should keep it a little cooler than today.
357 AM CDT Sun Apr 2 2017 High pressure shifting east of the region today should allow for milder conditions to move into the forecast area. In addition, things should remain rainfree until low pressure over the southeast TX coast begins to lift north into the Southern Plains tonight. This low is now progged to lift farther north/west as compared to yesterday at this time. Surface front will move through early Monday night as the low lifts northeast into the southern Great Lakes region.
129 AM EDT Sun Apr 2 2017 High pressure will provide fair weather tonight into Sunday with lows in the 30s tonight and highs near 60 degrees tomorrow. Another soaking rain is expected Monday into Monday night as low pressure tracks through the region.
Look for highs in the low 70s. Overall an unsettled weather week across the lower Ohio Valley with a couple of weather systems expected.
101 AM EDT Sun Apr 2 2017 A dry cold front will surge south through NC overnight. Pacific high pressure will shift southeast from the Midwest across NC on Sunday and then offshore Sunday night.
357 AM CDT Sun Apr 2 2017 The next round of rain is ongoing across the area as a large mid to upper level system moves into the High Plains. Areas further north have a bit of dry air still located in the lower levels, which is really eating into potential rainfall amounts further north than the HWY 50 corridor. This will bring with it much better mid/upper level ascent as the PV anomaly becomes much more pronounced with the main trough.
348 AM CDT Sun Apr 2 2017 Scattered precip continues over much of the area as moisture/warm air continues to push northeast of the main upper low over the Southern Rockies. Short-range solutions continue this trend into the morning hours, with upper wave making its way into the Pacific Northwest giving the broad troughing over the Central and Southern Rockies a push east, allowing some drier air work into western portions of the CWA. The next main area of precip looks to develop late in the night as the upper low to the southwest swings northeast with good synoptic-scale forcing ensuing still in a very moist troposphere. Have increased PoPs in mainly eastern areas ahead of this low. On Monday, the center of the upper trough will lift northeast and pass over extreme southeast KS.
A low pressure system will initiate showers and thunderstorms over the region on Monday.
/Issued 507 PM CDT Sat Apr 1 2017/ Current water vapor imagery reveals upper closed low spinning over east-central NM with indications of subsiding air entering the western Panhandles. Temperatures will hover in the high 30s across the NW zones to high 40s across the SE zones overnight. Otherwise dry conditions are expected and cloud cover should begin to decrease during the late morning and afternoon hours allowing temperatures to reach the low to mid 60s for most areas with split flow aloft.
The forecast for a relatively mild overnight with lows in the upper 30s to the lower 40s is well on track under an expansive cirrus shield and mixing via southerly flow ahead of low pressure across southern Saskatchewan. A trailing cold front will bring northwesterly winds of 10 to 20 mph to western and central ND Sunday.
258 AM EDT Sun Apr 2 2017 High pressure builds in through Sunday.
131 AM EDT Sun Apr 2 2017 Deepening low pressure east of Long Island will depart early this morning. High pressure will then slide across from Sunday night into Monday.
A cold frontal passage early this morning brought light rain showers to the area. This will keep temperatures a little cooler today around normal for this time of year. Northwesterly flow remains in place as the upper level trough moves across western Montana on Monday. The trough will bring a chance of snow showers to the higher terrain of Baker County through the West Central mountains.
359 AM EDT Sun Apr 2 2017 An upper-level ridge axis will rotate directly over the eastern Tennessee Valley today, promoting a mostly sunny and warm day. A clear evening will then allow temperatures to drop quickly, but high clouds ahead of an MCS moving into the lower Mississippi Valley will quickly move into the Southern Valley by late evening/midnight. These clouds and a stout downslope wind will serve to keep temperatures around 15-20 degrees warmer tonight. A cold front associated with this system will push through Monday afternoon and evening.
316 AM CDT Sun Apr 2 2017 Early-morning water vapor imagery depicts an elongated mid-level trough stretching from western Nebraska to northwest Mexico with multiple circulations embedded within this broader-scale feature. Moisture flux and isentropic upglide within the warm-conveyor airstream associated with the upper trough have fostered a discontinuous band of convection extending from the southern Plains into mid MO Valley as of 08z.
Upper air pattern will become more amplified by the end of the period with ridge building in the west. Water vapor loop indicated an upper level low over eastern SASK with a jet on the south side. Upper low was moving to the east. Another upper level trough moving into the Pacific Northwest and will move across SD/NE on Mon. Another upper level trough over southwest Canada will move into the Northern Plains Tue night and bring a threat for rain/light snow Tue and Tue night.
133 AM EDT Sun Apr 2 2017 Aviation High pressure will continue to bring fair weather through Sunday afternoon and it will become milder Sunday. Fair wx will continue through Sunday afternoon with the high pressure ridge in control of the wx pattern. A low pressure system over the Arklatex region early Monday will move northeast and bring our fcst area a steadier period of rain late Monday through Monday night. We are discounting the outlying further north 12Z nam guidance solution and favor the further south GFS/ECMWF track of the low pressure system Monday through Monday night.
Wrap around light precip may linger through Monday with the trailing cold front making a push into NE OK Monday night.
In addition, a southward-moving cold front should cross North-Central MT between midnight and early evening on Monday. Precipitation coverage is expected to be scattered to numerous over North-Central Montana due, in part, to the aforementioned cold front. The upper level low pressure trough will deepen over the central U.
1131 PM MDT Sat Apr 1 2017 Satellite images this afternoon were showing the upper low centered over west central NM. Radar has been showing bands of snow rotating around the upper low into sern CO, and spotter reports indicate moderate to heavy snow under these bands with quick accumulations of one to three inches. The upr trof wl continue its eastward movement acrs NM and CO tonight. The central mtns will likely have the best chances for some afternoon showers, ahead of an approaching upr trof. Temps on Sun wl be warmer, with mainly 50s in the Upper Arkansas and San Luis Valleys and in the mid 50s to lower 60s acrs the southeast plains.
418 AM CDT Sun Apr 2 2017 As the main positive tilted upper level trough develops across the Rockies extending equatorward into northern Mexico, this will continue to the be main focus of the weather pattern over the near term forecast period.
High pressure will move offshore the Mid Atlantic today, placing much of the CWFA into easterly flow through tonight. Good surface instability will be present, as will forcing along the leading edge of the MCS/pre-frontal trough. In addition, very good mid level support will also be present in the form of a negatively tilted trough and steep lapse rates.
With the drier air in place tonight, should see some cooler temperatures but it will warm back up on Monday with lots of sunshine expected behind the upper system. For high temperatures again going on the warmer side of guidance. South flow redevelops Monday Night as the next s/w trough digs through the SE CONUS with sfc cyclogenesis occurring across the Southern High Plains of TX.
536 AM EDT Sun Apr 2 2017 Building high pressure should result in dry weather today. A series of crossing low pressure areas will keep periodic rain chances in the forecast for the upcoming work week. Stratus should continue to erode and exit the region through sunrise under building high pressure. Showers are expected to increase from W-E later Monday and Monday night as the trough approaches, with increasing moisture, ascent, and low level jet support.
544 AM EDT Sun Apr 2 2017 Building high pressure should result in dry weather today. A series of crossing low pressure areas will keep periodic rain chances in the forecast for the upcoming work week. Stratus has eroded across most of the area under building high pressure, though some patchy fog has formed as radiational cooling resulted in nearly saturated air at the surface. Showers are expected to increase from W-E later Monday and Monday night as the trough approaches, with increasing moisture, ascent, and low level jet support.
619 AM EDT Sun Apr 2 2017 High pressure will build over the region today.
A low pressure system will move north to south through the Silver State today and Monday.
A broad diffluent region downstream of this trough will persist throughout the day as this wave takes on a bit of a negative tilt as it lifts northeast across the area. This warm front will lift north across the CWA overnight, ramping up rain chances to 70-90%. We should see a lull in convection Monday morning in the wake of the overnight showers and thunderstorms, but redevelopment is likely during the day as the cold core of the upper-level cyclone moves overhead. Precipitation comes to an end Monday evening as the trough moves east.
400 AM EDT Sun Apr 2 2017 TODAY through MONDAY: Prevailing flow will be southeasterly today as high pressure center slides off the Carolina coast.
A Cold front sets just north of the International Border about a municipality deep. have gone in and further elongated out the warmer temperatures over the next few hours by using interpolation. This low will push a cold front east across the area tonight with winds being the biggest sensible weather change. Precipitation will stay well to the north tonight with the low. An upper trough moving in late Sunday will destabilize things and trigger showers over central Montana. TFJ Monday, the upper level trough and front is forecast to move ENE across northeast Montana with the front stalling over extreme NE and northern Montana with a boundary running NW toward Swift Current.
307 AM CDT Sun Apr 2 2017 Cool and relatively moist surface ridging will hold sway across the region again today. The one exception may be across the far western/northwestern zones where they could see enough drier air move in to promote the return of some sun this afternoon and highs in the low to middle 60s. Regarding rain chances, the slow moving upper low was still spinning well off to our southwest moving into northern Chihuahua as of 08Z. The question mark is just how far north the northern fringes of the precipitation can make it today as the upper low accelerates eastward, then northeastward tonight into eastern Oklahoma by 12Z Monday.
With front and upper trough moving east of the area Monday morning.
Currently, an upper level low pressure system centered over north central Mexico can be seen on water vapor imagery. With continued warm/moist advection in the low-levels along with increasing lift in the mid and upper levels, the active weather will spread eastward today. We have already seen some impressive totals at Del Rio (almost 5") today and given impressive moist air advection in the low-levels and a very efficient rainfall setup, we have issued a Flash Flood Watch for portions of the Rio Grande plains, southern Edwards Plateau, Hill Country and I-35 corridor today. Still, can't rule out some showers and storms across the Hill Country and I-35 corridor north of San Antonio as the center of the upper low passes across the mentioned areas.
310 AM EDT Sun Apr 2 2017 Building high pressure should result in dry weather today. A series of crossing low pressure areas will keep periodic rain chances in the forecast for the upcoming work week. Stratus should continue to erode and exit the region through sunrise under building high pressure. Showers are expected to increase from W-E later Monday and Monday night as the trough approaches, with increasing moisture, ascent, and low level jet support.
trough and into the upper Midwest. The main trough lifts to the southern Plains tonight with copious precipitable water approaching 1. Southeasterly winds developing due to high pressure over the northeast U.
Light winds and warmer temperatures are in store for the southern Great Basin and Mojave Desert today. However, they will be short lived as a another front brings wind, cooler temperatures and showers on Monday. Models forecast a belt of west to southwest winds across the Mojave Desert Monday morning with a cold front bringing gusty northwest winds to the northwest CWA. Winds across the deserts will continue through the afternoon as the cold front continues to push south through the region. Cooler temperatures are forecast for Monday but MOS guidance and model data vary wildly with highs anywhere near normal to 10 degrees below normal.
Synoptic Setup: Short term begins with a weak ridge existing over the Upper Mississippi Valley and a large trough moving onshore of the Pacific Northwest and British Columbia. Monday: Center of the trough will wander into central Montana and bring temperatures aloft low enough to generate broad synoptic lift and light scattered rain showers.
346 AM PDT Sun Apr 2 2017 A low pressure system will move southeastward through the Great Basin on Monday.
1125 PM MDT Sat Apr 1 2017 Split flow upper levels continue across the CONUS as a large upper low drifts across the Four Corners. Return flow will continue to bring warmer temps across the area for Sunday with highs in the 50s and 60s. The higher elevations of the Black Hills will have the best chance for snow, but accumulations are expected to be minimal.
117 AM EDT Sun Apr 2 2017 High pressure extending into the region will ensure fair weather through Sunday.
254 AM EDT Sun Apr 2 2017 High pressure will bring milder conditions today, but skies will be slow to clear until afternoon.
417 AM EDT Sun Apr 2 2017 High pressure will bring milder conditions today, but skies will be slow to clear until afternoon.
Skies continue to remain cloudy as the region still influenced by upper low over the desert SW. Light precipitation continues to lift northward across the area, associated with the upper low moving into the southern plains. The precipitation will gradually end tonight as the upper low moves into Texas.
/issued 351 PM CDT Sat Apr 1 2017/ (Tonight and Sunday) A cold front has moved south into the far northwestern part of our forecast area this afternoon. The cold front will continue to advance slowly to the south across the northern and western parts of our area through late this evening. An upper level low over the Arizona/New Mexico border this afternoon will drop south into northeastern Mexico tonight, then lift northeast into west central Texas by Sunday evening. Temperatures will be much cooler on Sunday, as the cold front continues to move slowly south.
342 AM CDT Sun Apr 2 2017 This morning a trough of low pressure and an associated cold front extended from eastern Saskatchewan southwest through central Montana. A warm front extended from Saskatchewan through northeast North Dakota. Abundant high clouds will initially spread across the state but as the cold front enters the west will see clearing behind it northwest. Highs should warm into the lower to middle 60s across the south central where frontal mixing ahead of the cold front should somewhat overcome the clouds. Somewhat cooler air will move into the northwest but the afternoon early April sun will help soften the cooling. Highs there will be at least into the low to mid 50s. Clearing skies tonight are expected in the wake of the cold front with overnight lows in the 30s.
The ridging that brought pleasant weather to the area yesterday will continue to slowly exit the area while deep low pressure slowly approaches from the southwest. Warm advection and some weak short wave energy riding over the top of a flattening ridge will push into the western Great Lakes this afternoon, bringing a chance of showers to the area from about mid afternoon through mid evening. Medium A 500 millibar trough will lift northeast from the southern Plains into the eastern Great Lakes. Pressure gradient tightens up later Monday into Monday night as the low strengthens to our southeast and east.