Aikyam-Lab/Synoptic-Bench huggingface dataset:
/Issued 701 PM EST Thu Dec 21 2017/ Wedge of high pressure has built into the area with easterly winds and low ceilings across the CWA. The wedge begins to retreat Friday as cold front approaches the Mississippi River valley. However, models typically diminish the wedge a bit too fast so not expecting a vast improvement with the low clouds Friday evening. /Issued 310 AM EST Thu Dec 21 2017/ The next cold front approaches nw GA late Friday night and moves into the forecast area on Saturday with increasing rain chances, most so for n and portions of central GA.
241 AM CST Thu Dec 7 2017 A deep, positively tilted trough currently extends into the region this morning. The strong CAA associated with this trough will keep temperatures well below normal today. By this evening, the trough will transit to the east and mid and upper level ridging will replace it.
Today's weather will be very similar to yesterday as we remain in the longwave trough. Highs today will be a few degrees warmer with highs ranging from the low to upper 40s. Lows overnight will be colder as colder air continues to work its way down into the trough. Lows in the lower 20s to upper 20s can be expected.
226 AM EST Thu Dec 7 2017 Moisture starved cold front moves through today.
206 AM CST Thu Dec 7 2017 Elongated upper trough extends from Lake Superior southwest to Kansas early this morning, ushering in much colder conditions over a large part of the region. Radar mosaics showing a large area of very light echoes dropping southward, associated with the trough itself, with surface reports upstream showing some visibilities as low as 3 miles.
Cold front has made it just about all the way through northeast Florida this morning. Behind it, cold air advection will bring much cooler temperatures, abundant cloud cover, and periods of drizzle/light rain expected to continue for much of the day today. High temperatures this afternoon will likely only be a few degrees warmer than current temperatures (upper 40s to low 50s north of I-10, mid 50s to low 60s south of I-10).
Highs will only be about 30F in BFD and the higher elevations of the Laurels.
307 AM CST Thu Dec 7 2017 There will be quite a difference in temperatures today as an upper level trough currently in the upper Midwest and northern Plains sags south-southeast toward our area during the day today. A cold front is moving through the CWA as we speak. Therefore, most places will likely stay in the lower to mid 30s for highs north and upper 30s south.
Cold air will continue to funnel into northern and central New Mexico Thursday as an upper level trough brings a few inches of snow to the northern mountains. A warming trend will commence with dry weather Friday through the first half of the coming work week due to a strong ridge of high pressure over the western United States.
This activity should exit stage right after 00z this evening with attention then shifting to the inbound cold front that will result in a significant cooldown as Arctic air surges southward following its passage. Recent model runs had advertised precip down across the lower Missouri Valley with its passage, however this threat appears to be fairly limited per latest runs which for the most part have removed much of the QPF mention.
249 AM CST Thu Dec 7 2017 High clouds are moving across a large portion of the Mid-South early this morning with temperatures ranging from the upper 20s to the lower 40s. A cold front was located from southern Illinois through northwest Arkansas and into northwest Texas. High pressure will build into the region tonight resulting in a cold night with lows Friday morning from the upper teens to the upper 20s.
Highs tomorrow in the upper 30s to low 40s may actually occur during the late morning/early afternoon before temperatures start dropping again behind the second surge of cooler air.
An upper ridge along the Pacific Coast will expend east into Montana today and Friday. This will push a frontal boundary currently over Eastern Montana to the east this morning and bring warmer air mass into the forecast area today. There will be some mid and high clouds overtopping the ridge that will move through the area at times today and tonight. A large upper level ridge will remain over the Pacific Coast during the entire period. There will be a deep upper trough to the east with Montana in varying degrees of NW flow aloft.
1049 PM CST Wed Dec 6 2017 In the wake of the cold front that brought light snow to the region this morning, a tight pressure gradient will continue to force gusty northwest winds in the 25 to 35 mph range through sunset. The amplified upper-level flow pattern remains, with a ridge centered over the the West Coast and a trough stretching from Hudson Bay down through the eastern states.
Current surface analysis places high pressure over the Canadian prairies settling into the northern plains. Upper level analysis places trough stretching from the Great Lakes towards the four corners region with ridge over the Pacific northwest. temperatures will moderate some with highs climbing to near average as Pacific ridge starts to scamper east.
258 AM EST Thu Dec 7 2017 Weak high pressure will gradually build into the region through Friday with generally fair weather expected for most of the area.
Local thermodynamic data from both radiosonde and satellite reveal higher equivalent potential temperature near the surface and cooler mid-tropospheric temperatures, indicating atmospheric destabilization. Currently, air temperatures in most Keys island communities are holding steady in the mid 70s, with dewpoint temperatures in the lower or mid 70s.
1041 PM MST Wed Dec 6 2017 Current surface analysis shows a Canadian cold front sliding south of the forecast area now. Upper level analysis shows low pressure over southern Hudson Bay, with large trough covering a good portion of the US. A ridge lies along the west coast with strong northwest flow remaining over the Northern Plains. A warmup will take place for late week and into the weekend as the large upper trough shifts a bit to the east, allowing warmer air under the western ridge to gradually build in. Cold front will shift back north and east as a warm front on Thursday, allowing highs to get back to near average levels in most areas.
An area of low pressure over MN embedded in northerly flow aloft is helping to generate some scattered flurries over the northeast corner of the South Dakota over into west central MN. North to northwesterly flow remains at 500mb, with a large trough extending from north central Canada through Hudson Bay, the Great Lakes, and into the south central U. At the same time a high amplitude ridge is over the western U. Actual moisture profiles are pretty varied for this time, but do show at least a small potential for a couple of hours of freezing drizzle for Brown/Spink Counties as precipitation ends around daybreak Friday. The pressure gradient will increase Friday afternoon-Friday night as the trough exits across the Great Lakes and southeastern Canada, and large high pressure dominates the intermountain west.
20 Main focus clearly has been on the front end of the fcst period with rain/snow transition potential along an enhanced broad swath of SW to NE moisture and the interaction of a cooling airmass driven by a ridge to the NW and upper trough amplification to the west.
High pressure will remain in control of the weather tonight bringing mainly dry conditions to South Florida. /issued 345 PM EST Wed Dec 6 2017/ The pattern across the region will start to change on Thursday as high pressure continues to move away from the region. At the same time, an amplifying mid level trough will continue to dig further southward and it will send a cold front towards Florida during the next few days. This will help to begin to increase the low level moisture in the area during the day on Thursday and into Thursday night. Shower coverage will remain scattered during this time and during the day on Friday as well due to the slow speed of the approaching cold front.
Combination of cold air advection and increasing cloud cover will only allow high temperatures to climb into the lower and middle 30s. The forecast area will remain in between upper level high pressure over the west with low pressure over the east/northeast. Toward the end of the period the influence of the upper low will be felt and the upper high pushed west off the west coast.
A cold front currently moving through SE MO will move across the area later today and bring even colder air to the TN Valley tonight. The high level clouds may continue to linger across portions of the area, which should also help to keep temps from falling too far. On Friday an elongated upper level trough axis moves into the MS River Valley. Ahead of the trough axis, strong vertical lift is forecast to develop over the area. While the lower levels remain dry, the combination of strong vertical forcing and mid/upper level moisture could allow for a light mixture of rain/snow to occur east of a Cullman to Scottsboro line on Friday. The trough axis moves east of the area Friday night with skies clearing.
1154 PM CST Wed Dec 6 2017 Current water vapor imagery showing the upper trough beginning to drop southeast across the cwa.
/issued 827 PM EST Wed Dec 6 2017/ Large and amplified upper trough over N America this evening continues to slowly dig into the Gulf of Mexico. Strong WSW flow aloft bringing atmospheric river from the E Pacific over the Deep South overrunning the developing low pressure area in W Gulf and stalling surface front draped over the Central to NE Gulf into the W Atlantic.
154 AM EST Thu Dec 7 2017 A ridge of high pressure will extend over the area through today.
300 AM CST Thu Dec 7 2017 A strong northerly upper level jet max will keep the low levels cold through the morning. By afternoon a weak ridge of high pressure will pass to the south and allow surface winds to back a bit more towards the west. This will aid in advecting warmer air in from the west, but an abundance of mid and high level cloud cover should limit any warming potential. Moisture in the lower levels as well as temperatures warming through the more favorable dendritic levels suggests that light snowfall and flurries are unlikely today. As this jet max drifts east the slightly warmer low level air will allow temperatures to climb towards normal on Friday.
/issued 345 PM CST Wed Dec 6 2017/ Wx map shows cold high pressure continuing to build south across the region, providing fairly strong offshore flow with marine warnings issued. Radar showing Surface temperatures are expected to remain above freezing, so no accumulation of frozen precipitation is expected this afternoon or overnight across the region. The NAM showing more moisture lingering later into Friday morning, thus generating more mixed precipitation or changeover to snow, while the GFS/ECMWF ending the precip a bit sooner further north over inland SE TX/C LA with lingering over Acadiana, with the lingering question of if the temperatures will reach the freezing mark that far south.
The Upper Midwest remains under the influence of an expansive area of high pressure located over southern Hudson Bay, leading to cyclonic flow across the area. As the low slowly moves off to the east, the pressure gradient will slowly relax across the region. An upper ridge will be over the western CONUS/British Columbia region putting the Northland in northerly flow aloft. The western ridge will weaken some late in the period and shift a bit further west but the flow will remain northwest over the Northland.
Tonight and Thursday Large scale upper trough will prevail over the western Great Lakes region tonight, providing cloudy skies with light snow showers or flurries across the forecast area. A weak ridge will edge over the western Great Lakes region on Thursday, bringing a swath of dry air over the area and turning mid level winds to a more westerly direction. Despite the sunshine, highs will remain below normal with temperatures ranging from the upper teens across the north, with highs in the lower to middle 20s across the south.
Warmer day expected based on height and thickness increases and 700 mb temperatures near -2 Celsius.
This is within an area of 925-850 mb frontogenesis in the wake of the cold front. There is a low that traverses to our northeast on Friday and it shows a weak trough passage.
254 AM EST Thu Dec 7 2017 High pressure will build south of the region today and remain to our south tonight into Friday.
H850 temps should increase about 10 deg over eastern ND while remaining significantly cooler over the far east.
Near the coast, winds remaining elevated will lead to wind chills in the low 30s and upper 20s.
301 AM CST Thu Dec 7 2017 High pressure to continue to surge south today with some of the coldest temperatures of the season expected overnight. With prolonged warm temperatures since the previous first freeze in late October, will go ahead and issue a freeze warning for tonight for the entire ArkLaTex as temperatures are forecast to fall into the lower 20s across the interstate 30 corridor and upper 20s elsewhere. Temperatures this afternoon to range from highs in the lower to mid 40s across southeast OK to around 50 elsewhere. 700 mb trough across the midwest will shift south today bringing gradual clearing from the northwest.
with the cold front. The longwave trough pushes through the Ohio River Valley with rising heights over the Plains. Reinforcing cold air drops south on the back side of the trough with increasing winds and H85 of -10 to -15 over parts of Iowa accompanied by h85 winds.
356 AM CST Thu Dec 7 2017 Cold front is just clearing the forecast area with a few mid level clouds and brief snow flurries marking the advance of the attendant mid level trough.
315 AM CST Thu Dec 7 2017 Trough east/ridge west pattern continues (and will for a long time). Subjective 00Z upper-air analysis indicates broad upper-level trough centered on the Great Lakes but spanning the Great Basin to New England. Upper-level ridge was centered along the Pacific coast, and upper-level jet was strongest in advance of the trough, from the mid-Atlantic toward New England.
Few light snow showers and flurries will continue to affect the area through 12Z as last vestiges of mid-level short wave trof pass through the area. Expect decreasing cloud trend later this morning into the early afternoon due to weak short wave subsidence and influx of drier air in the low to mid levels. Backing low to mid level winds will allow slightly warmer air to return to the area later today and tonight. Today's partial sunshine will help the temperature rebound a few degrees into the low to mid 20s most areas, with wind chills in the single digits to low teens.
350 AM CST Thu Dec 7 2017 Clouds are on their way out this morning as the trough slides southeast and ridging builds in. Low pressure will track from northwest MN to western or central WI Friday afternoon, to Lake Michigan by Friday night. The deep trough to the east and the anomalously large ridge to the west will maintain a northwest flow for the Upper Midwest.
1152 PM CST Wed Dec 6 2017 Backdoor cold front produced a snow squall moving south this afternoon. Wet-bulbing and cold air advection will bring a significant cooldown of 10-15 degrees as the front passes through, and temperatures tomorrow will be considerably cooler with highs only in the lower 30s. We remain within north northwest flow within an amplified pattern of ridge to the west and trough to the east.
253 AM EST Thu Dec 7 2017 Ridging will remain in place through early Friday.
Given surface temperatures well above freezing, terminal impacts are not anticipated. Again temperatures staying above freezing even with wet-bulbing at the surface so no icy accumulations are expected.
348 AM CST Thu Dec 7 2017 Today will be considerably warmer than yesterday with temperatures in the 20s and 30s. Tonight, clouds will clear from west to east, but despite clearing skies temperatures may have a hard time falling below the low 20s due to winds around 15 to 20 mph.
SHORT TERM (Now through Friday): Patchy light rain near the coast this morning will turn into scattered showers and isolated thunderstorms this afternoon as an offshore front heads back north as a warm front. High temperatures will be held down into the lower to mid 80s today under ample cloudiness. After a partly cloudy Thursday night with low temperatures ranging from the upper 60s to lower 70s, conditions Friday will warm with high temperatures from the mid to upper 80s east to the lower to mid 90s inland. Southeast to south return flow will increase to breezy Friday afternoon with high pressure over the Gulf interacting with lower pressure stretching over the southern high Plains to west Texas.
346 AM PDT Thu Apr 5 2018 Weak high pressure aloft will bring mild conditions through Friday.
Some high clouds will begin moving into the area, especially along the Highway 82 corridor, through the afternoon. High pressure at the surface will shift east of the forecast area through the period, with winds gradually becoming more southerly in the process. The subtle increase in moisture will result in slightly warmer conditions today, despite the chilly start to the day, as highs range from the middle 60s to lower 70s under mostly sunny skies.
Main concerns in this forecast cycle are lows tonight with spotty freezing temperatures over parts of northern AR. Aloft, the deep upper trough has already moved east to the eastern US, while a northwest upper flow remains into AR. Tonight Through Friday Dry and cooler weather will continue tonight and Thursday. Tonight, cold again with around freezing temperatures expected in parts of northeast AR. Thursday will see mainly dry conditions with a south wind returning to the state with the high pressure off to the east of AR. Thursday night, low chances of rain will be possible some moisture return by then, and a warm front and some weak lift moving across AR.
535 AM EDT Thu Apr 5 2018 Mainly dry weather is expected today under high pressure.
327 AM EDT Thu Apr 5 2018 Mainly dry weather is expected today under high pressure.
407 AM MDT Thu Apr 5 2018 Expect continued light to moderate snow showers early this morning, with much colder temperatures thanks to a passing cold front.
255 AM MDT Thu Apr 5 2018 Upper low spinning over northern Saskatchewan is visible on water vapor imagery. The wave associated with the Canadian low will swing through the northern plains tonight, and cold air will spread into the region behind a cold front. Cold high pressure will settle into the northern plains Friday.
406 AM CDT Thu Apr 5 2018 Short term forecast highlights include patchy to areas of fog early this morning in the James River valley, light snow through the morning hours, and cooler temperatures with breezy conditions through the day.
A large trough will then quickly move through the area this weekend, bringing a brief window of widespread moderate precipitation followed by a cold front.
430 AM EDT Thu Apr 5 2018 High pressure passes south through Thursday.
456 AM CDT Thu Apr 5 2018 (Today and Tonight) Warmer temperatures will prevail across West Central Texas today, along with breezy south winds in response to developing lee trough. Afternoon highs will be above normal and range from the upper 70s over southeast counties, to the lower 80s elsewhere. Temperatures will be mild, with overnight lows in the lower 60s.
Weak short wave trough from central Oregon through western Nevada into southern California has only light radar returns early this morning. A stronger Pacific frontal system along 130W will almost overtake the weaker inland trough as the latter moves across our CWA today. Snow levels will rise to 7000- 8000 feet MSL today so pcpn will fall as rain, except in the higher mountains. On Friday a very moist and even warmer Pacific system will approach from the southwest, with rain reaching Harney and southern Malheur Counties during the day.
331 AM CDT Thu Apr 5 2018 Freezing temperatures across portions of the region this hour. Thicker cloud cover will move into the Midsouth tonight with a few light showers erupting as a warm front starts to materialize in the Red River Valley and the ARKLATEX.
The cold front will continue to move southeast of our area throughout the night, with much drier and cooler air being advected southeastward. Highs in the low to mid 70s will increase into the upper 70s on Friday. Lows in the upper 40s to low 50s Thursday night will only fall into the low 60s Friday night as moisture and clouds increase with the southerly flow ahead of the front.
Might start seeing some upslope stratus development tonight ahead of next cold front, becoming more expansive across the area late. Strong cold front expected early Friday. This is a western Canada airmass, and the high pushing into the central Plains should bring lows Friday night down into the teens. WRF indicates an upslope flow precipitation event developing across western Nebraska Friday and spreading south east, tieing into the low level warm advection overrunning developing over south central Kansas by late midday Friday. Friday will be cooler, but much more windy, creating limited fire weather conditions.
Forecast confidence is Medium: Some mid level clouds will likely increase in the southwest early this morning ahead of an approaching trough of low pressure. The trough will move through this afternoon into evening, bringing precipitation chances to southern Wisconsin. May see a little rain with snow in the afternoon and early evening given surface temps above freezing. Any higher precipitation rates will likely be snow though due to cooling in the lower levels.
304 AM MDT Thu Apr 5 2018 Today/Tonight: Canadian high pressure will build southeastward into the Upper Midwest tonight in association with subsidence in the wake of a potent upper level low progressing southeast from Saskatchewan/Manitoba to the Upper Great Lakes.
Winds will switch to northerly around 10 mph behind the boundary and then veer to the NE to around 15 mph through the day as high pressure builds over the Carolinas. Temperatures will be cooler with highs in the upper 70s Volusia coast to lower 80s from Orlando and and Clermont south across the interior. High pressure will move eastward from NC with low level flow becoming easterly and remaining 5-10 mph along the immediate coast through the night. High pressure will remain offshore northeast of the area with low level flow veering to the east/southeast.
208 AM EDT Thu Apr 5 2018 High pressure gradually builds in through Thursday, followed by another frontal system late Thursday night and Friday.
1234 AM CDT Thu Apr 5 2018 A weak low pressure area was moving across North Dakota and into MN late this afternoon and touching off some snow showers. Although there has been an increase in clouds with this system, very dry air in the low levels of the atmosphere has kept any stations from recording any snow.
502 AM EDT Thu Apr 5 2018 Currently - High pressure is moving eastward through the eastern United States. Forecast - High pressure moving eastwards through the eastern United States will enter the Atlantic tonight and continue elongating out to sea. The trailing ridge axis will settle southwards through the southeastern United States a mid latitude low swings through the northeast. Near to slightly normal temperatures will trend mildly upwards through this period, as the upstream trajectory taps into an increasingly warmer more humid airmass. Broad troughing aloft will help to increase CAPE and decrease inhibition.
646 AM EDT Thu Apr 5 2018 High pressure passes south through Thursday.
439 AM EDT Thu Apr 5 2018 High pressure along with cooler and drier air will be over the region through Friday then move eastward as the next low pressure system approaches.
332 AM EDT Thu Apr 5 2018 Winds will gradually decrease during the day today as a cold front moves off to our east.
Tonight temperatures warmer with some increase in mainly high clouds at times. Depending on cloud cover normal colder areas of northeast Tennessee and southwest North Carolina could still reach the lower to mid 30s.