Aikyam-Lab/Synoptic-Bench huggingface dataset:
734 PM EDT Tue May 19 2020 High pressure over Eastern Canada will keep our weather quiet and seasonable through the week. A stacked low pressure system will meander into the Tennessee Valley over the next 36 hours. In the meantime, high pressure over Eastern Canada will push cooler air into NY and PA Wednesday morning. Temperatures will fall into the lower and middle 40s tonight, then rise into the middle 60s on Wednesday. Wednesday night will be cooler, with the potential for spotty frost over our eastern forecast area.
653 PM EDT Tue May 19 2020 Southward sagging low pressure will maintain shower chances over parts of the region through the week. Otherwise, cut-off low pressure continues to remain stagnant over the Tennessee Valley. Cool temperature will continue until the low propagates eastward. Accompanying the cut-off low, associated precipitation will move over the region and continue shower chances, with the best forcing and highest probability of precipitation still west/southwest of Pennsylvania. Cooler temperature will continue in the short term. A tight pressure gradient between the low to the S, and high pres to the N will maintain Ely wind with gusts of 25 to 30 kt. Periodic restriction potential is expected Wed night thru Fri as the low drifts N and gradually fills.
Cooler temperatures can be expected Wednesday, before warming again into the weekend.
Vertically stacked area of low pressure over western Kentucky continues to wrap low clouds back across eastern Iowa and northwest Illinois.
These weather conditions will change significantly starting tomorrow morning as a low pressure area and associate cold front moves through the region.
A cold front will approach the area overnight, back sfc flow KMAF/KHOB/KINK. A high amplitude mid level ridge along with impressive thermal ridging is leading to the very hot temperatures being seen today. The mid level ridge begins to break down Wednesday as the trough over the western U. A weak cold front will enter the area from the northeast Wednesday morning, but will likely move back north by afternoon.
915 PM EDT Tue May 19 2020 High pressure over Eastern Canada will keep our weather quiet and seasonable through the week. A stacked low pressure system will meander into the Tennessee Valley over the next 36 hours. In the meantime, high pressure over Eastern Canada will push cooler air into NY and PA Wednesday morning. Temperatures will fall into the lower and middle 40s tonight, then rise into the middle 60s on Wednesday. Wednesday night will be cooler, with the potential for spotty frost over our eastern forecast area.
- Lingering light rain showers ending KGRR/rgnl radar trends show light rain showers moving from ese to wnw across portions of our area as a result of low level easterly flow and the circulation around the upper lower over the western TN Valley region. A consensus of latest high res guidance suggests that a few light rain showers and sprinkles will linger late this afternoon and evening before ending as the upper low moves further se and away from our region. - Dry weather returns Dry wx will finally return late tonight and Wednesday as the upper low continues to move further away from our region.
/issued 308 PM CDT Tue May 19 2020/ Precipitation from the upper level low has underperformed so far today. Will still maintain low rain chances this afternoon, mainly across West Tennessee as the upper low sinks closer to the area. Overnight, the low is expected to weaken slightly as it turns to the East tracking along the Mississippi, Alabama and Tennessee State lines.
Interaction between a weak front moving through Florida and high pressure over the central Gulf of Mexico will keep west-southwest winds around 10-15 knots over the gulf coast waters through tomorrow before gradually shifting to the south.
Aside from a couple stray showers over the interior mountains early this evening and some patchy coastal drizzle during the next couple of mornings, high pressure will bring dry weather through the weekend. Additionally, inland temperatures should trend a bit warmer, though still near or slightly below seasonal averages, with highs into the low to mid 70s for the warmer valleys.
Shower and thunderstorm chances will continue this evening across Inyo, Esmeralda, Nye, and Lincoln counties with a strong low pressure system over the region.
Classic late spring northwest flow pattern will prevail through midweek as a deep cut-off closed upper level trough sits over the Ohio and Tennessee valleys. A weak slow moving frontal boundary will swing around the back side of the trough on Wednesday. Weak high pressure will remain over the northern Gulf on Tuesday and slowly migrate eastward throughout the week. Max temperatures will remain slightly above normal with low temperatures being well above normal given the higher dewpoints as tropical airmass settles. however clouds will begin to increase overnight ahead of a cold front especially along northern terminals. IFF to MVFR conditions expected after 15Z on Wednesday as widespread showers and thunderstorms develop along a frontal boundary along the southwestern sector of an upper level trough located over the eastern Tennessee valley.
Highs will climb to the lower 90s except along the immediate coast, where they might remain just below 90 degrees. Low pressure to our north and ridge building from the southeast will keep the local winds from the southwest to west tonight and will turn onshore from around Sebastian Inlet southward, and increase to around 10 to 15 knots.
1029 PM EDT Tue May 19 2020 The stretch of nice weather continues across the North Country as high pressure remains anchored across eastern Canada.
711 PM EDT Tue May 19 2020 The stretch of nice weather continues across the North Country as high pressure remains anchored across eastern Canada.
858 PM CDT Tue May 19 2020 An upper level low pressure system remains over the Tennessee River Valley this evening. Shower development associated with the upper low peaked just before sunset. /issued 308 PM CDT Tue May 19 2020/ Precipitation from the upper level low has underperformed so far today. Will still maintain low rain chances this afternoon, mainly across West Tennessee as the upper low sinks closer to the area. Overnight, the low is expected to weaken slightly as it turns to the East tracking along the Mississippi, Alabama and Tennessee State lines.
Another area of low pressure will develop over central Georgia overnight, and scattered showers and isolated storms will move towards the Altamaha River towards daybreak on Wednesday.
938 PM CDT Tue May 19 2020 High pressure continue to build into the region bring quite and dry weather to southern Wisconsin. High pressure will be building in over the lake tomorrow, which will keep the weather dry and quite. High pressure is beginning to build into the region which should help bring some dry air to southern Wisconsin late this evening through the overnight hours. Medium Influence of the low to our southeast is expected to gradually wane. High pressure builds in through Wednesday. Onshore flow will keep things cooler in the east on Wednesday, however inland areas will get a nice boost with more in the way of May sunshine expected. The influence of the high will linger into Wednesday night.
Otherwise rest of the forecast still looks on track as low clouds look to set in the rest of the night on the northwest side of the upper low. Overnight lows will not fall of much more given the low clouds and light winds. Britt Deep cut off low pressure centered over southwest Kentucky/northwest Tennessee will drift southeast into eastern Tennessee tonight. Meanwhile, the next upstream longwave trough over the western CONUS will continue moving slowly east, squeezing the longwave ridge over the Great Plains between it and the low over Tennessee. The northern portion of the ridge wraps itself anti-cyclonically around the Tennessee low Tuesday into Tuesday night, and gets pinched off between the two troughs by Wednesday morning.
Winds will diminish this evening followed by cooler temperatures on Wednesday as a weather system moves north of the area.
Upper level trough is slowly transitioning from NV to Idaho this evening with precipitation becoming widespread across SW Idaho and NE Oregon. A TROWAL is beginning to form across SW Idaho as moisture wraps around the trough. The trough will continue to rotate over central Idaho through midday Wednesday before moving into MT by evening.
718 PM EDT Tue May 19 2020 The stretch of nice weather continues across the North Country as high pressure remains anchored across eastern Canada.
957 PM EDT Tue May 19 2020 Large high pressure over Quebec will bring a warming trend with fair and dry weather expected through a majority of this week.
634 PM CDT Tue May 19 2020 219 PM CDT Even after several days we still aren't quite rid of our pesky upper low, with its influence still being felt today as it continues to slowly drift southward out of southern Illinois. Carlaw 219 PM CDT As the cut-off low pressure system mentioned above stalls in the Ohio River Valley and ridging builds northward into Canada (e.
737 PM EDT Tue May 19 2020 Aviation - Lingering light rain showers ending - Dry weather returns - Significant moderating trend of temperatures - Lingering light rain showers ending KGRR/rgnl radar trends show light rain showers moving from ese to wnw across portions of our area as a result of low level easterly flow and the circulation around the upper lower over the western TN Valley region. A consensus of latest high res guidance suggests that a few light rain showers and sprinkles will linger late this afternoon and evening before ending as the upper low moves further se and away from our region. - Dry weather returns Dry wx will finally return late tonight and Wednesday as the upper low continues to move further away from our region.
Showers are ongoing this evening, with quick bursts of heavy rainfall rates along slow storm motions circling around the strong upper low.
707 PM CDT Tue May 19 2020 Visible satellite this afternoon shows a broken deck of low level clouds across the region as an upper-level cut-off low is situated over southwestern Kentucky that is very slowly moving towards the southeast. A similar, albeit slightly warmer, day is in store for Wednesday as the upper level low becomes situated under a rex block to our east. This will lead to the low retrograding across Tennessee and Kentucky, resulting in lingering areas of cloud cover and some isolated sprinkles and light showers throughout the day tomorrow.
High pressure in place resulting in clear skies and light E-NE winds.
A strong upper level low pressure system currently spinning over Nevada will pump a significant amount of moisture into the region beginning this afternoon and evening. As the upper level low slowly lifts northwards this evening, scattered thunderstorms will transition to more persistent, widespread rainfall. By Wednesday morning, the main upper level low will be lifting into western Montana and central Idaho. The heaviest precipitation is expected to shift northward into northwest Montana and wrap around the low into central Idaho under an area of deformation.
617 PM CDT Tue May 19 2020 Deep cut off low pressure centered over southwest Kentucky/northwest Tennessee will drift southeast into eastern Tennessee tonight. Meanwhile, the next upstream longwave trough over the western CONUS will continue moving slowly east, squeezing the longwave ridge over the Great Plains between it and the low over Tennessee. The northern portion of the ridge wraps itself anti-cyclonically around the Tennessee low Tuesday into Tuesday night, and gets pinched off between the two troughs by Wednesday morning.
532 PM MDT Tue May 19 2020 00Z TAF CYCLE Upper low/trough moving into the Great Basin has strengthened sly flow aloft over NM as well as drawn up mid level moisture, which has developed into sct virga showers and isold tstms with gusty erratic winds over central NM. The near record heat over New Mexico today will trend cooler through the end of week as a weak trough of low pressure moves through the Rockies.
639 PM CDT Tue May 19 2020 Td values have been recovering and the lowest values are now in the mid to upper 40s across our northeast finally reflecting the trends models had been hinting at. Temps on the other had are a bit warmer in those areas (around 80) and this is still keeping RH values around 30% in northwest MN.
The upper level low that has brought active weather continues to make its journey to the east this afternoon. The trough will be pushing into the four corners region on Wednesday with upper level riding building into NorCal.
High pressure is beginning to build into the region which should help bring some dry air to southern Wisconsin late this evening through the overnight hours. Medium Influence of the low to our southeast is expected to gradually wane. High pressure builds in through Wednesday. Onshore flow will keep things cooler in the east on Wednesday, however inland areas will get a nice boost with more in the way of May sunshine expected. The influence of the high will linger into Wednesday night.
1226 AM EDT Wed May 20 2020 High pressure over Eastern Canada will keep our weather quiet and seasonable through the week. A stacked low pressure system will meander into the Tennessee Valley over the next 36 hours. In the meantime, high pressure over Eastern Canada will push cooler air into NY and PA Wednesday morning. Temperatures will fall into the lower and middle 40s tonight, then rise into the middle 60s on Wednesday. Wednesday night will be cooler, with the potential for spotty frost over our eastern forecast area. Lows will likely be in the lower 40s to lower 50s.
With upper flow sharply backed to southerly, this was also drawing deep moist air out of northeast Mexico and across the lower Pecos into the western South Plains with Precipitable Water levels in excess of an inch, or around 150% of normal. Meridional flow will continue to overspread the forecast area early Thursday as a closed low pivots across the Intermountain West region and transitions into an open wave.
Another morning of low cloud cover and patchy drizzle is in store for eastern Nebraska and Iowa, with low-level moisture being dragged in from the east by the stalled out closed low centered in central Tennessee. To the west, troughing is progressing eastward slowly and is currently centered along the Idaho/Oregon border. This will try to push eastward over the course of the next few days, but its progress will be slowed by the meandering closed low in the southeast. With the area still being under the influence of the closed low in the southeast, low-level moisture will continue to be channeled into the area. This persistent low-level moisture will likely mean another dreary day for much of eastern Nebraska and Iowa and cooler temperatures where clouds persist.
452 AM EDT Wed May 20 2020 A closed upper low will meander over Tennessee and Kentucky the next two days, as high pressure remains entrenched over the northeast CONUS.
This moisture should help keep temperatures a couple of degrees cooler versus yesterday. Synoptically, there remains a ridge in the mid-levels over the Plains, but this feature is expected to begin to weaken today as a deep trough across the western CONUS slowly moves east. Otherwise, highs will be in the upper 80s to upper 90s across the region with the higher values in the southwestern CWA.
307 AM EDT Wed May 20 2020 High pressure over Eastern Canada will keep our weather quiet and seasonable through the week. A stacked low pressure system will meander into the Tennessee Valley over the next 36 hours. In the meantime, high pressure over Eastern Canada will push cooler air into NY and PA Wednesday morning. Temperatures will fall into the lower and middle 40s tonight, then rise into the middle 60s on Wednesday. Wednesday night will be cooler, with the potential for spotty frost over our eastern forecast area. 300 AM Update Dry ridge of high pressure remains firmly entrenched over our region for Thursday night.
A low pressure system over Nevada will lift away toward Idaho and Utah tonight.
A high amplitude mid level ridge along with impressive thermal ridging is leading to the very hot temperatures being seen today. The mid level ridge begins to break down Wednesday as the trough over the western U. A weak cold front will enter the area from the northeast Wednesday morning, but will likely move back north by afternoon. Fire weather concerns also pick up Wednesday and Thursday across the higher terrain. A trough over the Rockies is forecast to cut off from the main flow and drift southeast in some fashion. The ECMWF is stronger with the low and basically parks it over TX for several days while the GFS is much more progressive with the system.
249 AM EDT Wed May 20 2020 High pressure will settle in across the area bringing not only fair and dry weather but a warming trend for the rest of this week.
357 AM CDT Wed May 20 2020 Cut-off upper level low pressure will move very little over the next 24 hours as a blocking ridge builds to its north and east from the Great Lakes to the East Coast.
The near record heat over New Mexico today will trend cooler through the end of week as a weak trough of low pressure moves through the Rockies.
Highs tomorrow should be a few degrees "cooler" than today considering a more southerly wind component and lower H85 temps. Persistent mid to upper level ridge will begin to weaken Wednesday night into Thursday in response to an upper level trough moving from the Rockies into the Great Plains. This will allow for temperatures to lower slightly, albeit staying in the low 90s.
309 AM CDT Wed May 20 2020 An upper level cyclonic flow will persist over the region into tonight as upper level low pressure retrogrades northwest across the Tennessee and Ohio Valley regions. We went a bit below the model blend for highs today with a slight nudge towards the cooler NAM nest.
153 AM EDT Wed May 20 2020 Large high pressure over Quebec will bring a warming trend with fair and dry weather expected through a majority of this week.
1136 PM EDT Tue May 19 2020 Large high pressure over Quebec will bring a warming trend with fair and dry weather expected through a majority of this week.
This next system, triggered by a developing low pressure system across the northern Rockies, will bring rain and thunderstorm chances to the region as well. For Thursday, the highest instability will shift eastward across central and eastern Nebraska.
Despite continued cloudiness, modest cold air advection will drop temperatures near current dew points in the low to mid 50s. Strong enough forcing and deep enough moisture should remain close enough to the area through Thursday night as the upper low meanders to the southeast and then back to the northwest into central Tennessee by Thursday. Temperatures with the persistent cloud cover with be cooler than normal during the day and near normal at night.
Lingering embedded thunderstorms remain within the spinning low pressure centered around the Northern Rockies this morning.
Latest water vapor imagery shows the cutoff upper low that has dominated our weather pattern this week, spinning over SE TN, with its large circulation affecting much of the eastern third of the country. With a large low cloud shield in place north of the upper low, any sunshine should be brief and would expect highs similar to those observed yesterday, mainly in the mid 60s. Though if some breaks allow an hour or so of sun these areas could reach the lower 70s (what we saw in eastern IL yesterday).
Much lighter winds and cooler temperatures can be expected Wednesday, before warming again into the weekend.
334 AM EDT Wed May 20 2020 The stretch of nice weather continues across the North Country as high pressure remains anchored across eastern Canada.
845 PM PDT Tue May 19 2020 Drier and warmer Wednesday into Thursday as the upper low lifts out.
1203 AM CDT Wed May 20 2020 Ceilings are currently VFR but will soon begin to lower in advance of a cold front moving in from the north.
335 AM CDT Wed May 20 2020 Satellite and radar imagery this morning shows center of upper level low is now over our southeast counties. Center of upper low is forecast by model guidance to wobble into east Tennessee today before shifting back northwestward into the Midwest on Thursday. However, coverage is anticipated to diminish each day as upper low slowly weakens and moves away from us. Temperatures will also remain below average due to the cold temperatures aloft associated with the low and clouds/precip.
The low pressure system over the Great Basin this evening will slowly advance east across Utah tomorrow, bringing moisture and a cooler airmass to the area.
WV imagery indicates a southerly flow aloft prevailing across the Western High Plains as an amplified upper level trough of low pressure shifts eastward across the Great Basin. Near the surface, a lee side trough of low pressure is developing in eastern Colorado. A stable airmass will be in place over most of the plains ahead of this feature owing to the large upper level low to the east, so that only a narrow ribbon of instability will develop east of the mountains.
Today, weak high pressure at the surface and ridging aloft will play a key role in our weather as will the mid-level low spinning over Tennessee which once again will spread some moisture into northeast Oklahoma and northwest Arkansas.
Otherwise, SC deck is expected to again develop across NE OK/NW AR with daytime heating on backside of upper low. High pressure in place resulting in clear skies and light E-NE winds.
1247 AM CDT Wed May 20 2020 219 PM CDT Even after several days we still aren't quite rid of our pesky upper low, with its influence still being felt today as it continues to slowly drift southward out of southern Illinois. Carlaw 219 PM CDT As the cut-off low pressure system mentioned above stalls in the Ohio River Valley and ridging builds northward into Canada (e.
(Today and tonight) Moisture continues to be lifted over a stalled frontal boundary stretched across northern Texas, as our upper ridge continues to flatten. However, energy from the synoptic upper low across the U. Although the low level (0-1 km) Bulk Shear will be gradually increasing to marginal levels of 25kt, the shear in the 0-6 km layer looks to be rather weak, so the tornado potential would be very low.
308 AM EDT Wed May 20 2020 Low pressure will maintain rain chances mainly south of I 70 today.
The Evening Update: Vort max on the backside of the upper low center over ID/NV near the NErn CA/OR border triggering a few showers and even T-storms this evening as it makes its way Swd towards Tahoe by 12z Wed. Maybe even a little pea hail with some of the higher REFs in deference to the deep, but very thin CAPE indicated in the area soundings. JHM The upper level low that has brought active weather continues to make its journey to the east this afternoon. The trough will be pushing into the four corners region on Wednesday with upper level riding building into NorCal. Short wave ridging will remain in place for Thursday.
301 AM EDT Wed May 20 2020 An upper low was over Tennessee early this morning.
Today Through Thursday A low pressure system over the eastern CONUS will bring northerly flow in the lower levels, which has been carrying low clouds into the state.
Meanwhile over the eastern half of the forecast area front of showers has enveloped the area from the northeast and represents the vanguard of the sloppy return flow around the Great Basin/Central Idaho upper level low which will cause a general increase in showers and eventually stratiform rain across all of the Idaho Panhandle zones and much of far eastern Washington for the next 24 to 36 hours. The organization of low pressure this evening and through the night will produce a band of prolonged moderate to heavy rain over the Idaho Panhandle and southeast Washington.