Aikyam-Lab/Synoptic-Bench huggingface dataset:
Much cooler and below normal temperatures are expected due to cold advection with the front to our south underneath multiple layers of thick clouds along with areas of rain. As an upper level trough moves over the Central Rockies, the front moves back north tonight into early Friday morning. The upper level trough moves across the Central Plains on Friday dragging a dryline into our western areas late morning into afternoon and a cold front possibly into the northern Hill Country and our Central Texas counties late afternoon into evening.
A pair of upper lows continue fill - one over the Great Lakes region and the other over the Intermountain West region. Southern stream energy continues to be focused along the southern third of the CONUS with mainly zonal flow in place and a weak midlevel ridge over the local area. A slight northerly breeze continues to support the gradual movement south of drier and cooler air. With more clouds moving in through the day, expect high temperatures to remain cooler overall with highs only the 50s. As the upper pattern begins to transition a bit with the western CONUS upper low filling then a positively tilted elongated lobe of energy becomes the semi-permanent feature for the next several days.
652 AM EDT Thu Apr 15 2021 A few cold fronts will move across the region through tonight. Cool and dry high pressure will follow through the end of the week. A cold front is currently moving east across the region, stretching from the southern Piedmont to the northern Coastal Plain. A secondary cold front, currently along the Appalachians, will move east across the region later today, ushering in a drier airmass and lowering dewpoint temps into the 30s by tonight. Highs today will be near seasonal normals, ranging from the upper 60s NW to the low 70s S. Temperatures tonight will radiationally cool to the low 40s NW and the mid-40s SE, with isolated cold spots in the upper 30s. Zonal flow aloft will become slightly more northwesterly as a weak ridge builds from the Midwest to the Mid-Atlantic.
337 PM EDT Thu Apr 15 2021 An upper low, centered over Lake Erie this mid afternoon hour, will drift southeast slowly cross PA tonight through Friday. Colder air will sweep across the region late today and turn the temperatures much cooler for the next few days. Some snow will fall across the higher terrain of the north and west later today into Friday and a light accumulation of an inch or so is expected across the ridgetops of Northern and Western PA by daybreak friday.
226 PM CDT Thu Apr 15 2021 Upper low continues to push east, now passing through lower Ontario, with plenty of residual cloud cover on the back side back over our area. Lingering morning sprinkles/drizzle have diminished as the low pulls east, so we're looking at a period of quiet weather as weak surface ridging continues to nudge in for tonight into Friday. This results in lows in the lower 30s in much of central and north-central Wisconsin under the most clearing, and middle 30s elsewhere.
The closed upper low that's been churning over the Upper Midwest for multiple days has finally started shifting eastward as it rejoins the flow aloft. At the surface, high pressure centered over the Northern Plains is stretching across the mid-section of the country and influencing conditions here in central Illinois. The cold air mass associated with this high will spread further south than last night, bringing near freezing low temperatures into the entire CWA. Winds will be noticeably lighter today as the 850 mb jet associated with the closed low shifts east.
The CONUS is currently being dominated by two closed upper lows, one acrs the central Intermountain region, and the other region-closer by spiraling acrs the western GRT LKS. The GRT LKS low complex will continue to stream clouds and cool air down it's western flank down acrs the local area, before it pulls away enough to the east for an in-between ridge induces a fair wx day Friday.
Forecast is on track with highs climbing into the low to mid 60s under mostly sunny skies. /issued 341 AM CDT Thu Apr 15 2021/ Cooler than normal temperatures and generally dry weather are expected through the entire forecast period.
1139 AM MDT Thu Apr 15 2021 A complicated forecast scenario continues early this morning, with a vigorous closed upper low currently drifting eastward across the Great Basin per GOES-16 WV satellite imagery.
A gradual moistening of the middle and upper layers of the atmosphere will occur mainly after midnight tonight, as cirrus spills over the ridge axis and across the WFO PAH forecast area. The first wave ejection from the double barrelled Low pattern sees it breaking into/across the dampening mean surface to mid level short wave ridge (aforementioned in the short term) beginning Friday night.
The highest chances for TSRA will be from 20-00Z this afternoon, but with such isolated coverage, we opted to forecast VCSH, as aircraft and routing should be able work around the cells.
100 PM CDT Thu Apr 15 2021 Cyclonic flow continues for yet another day with the upper low over the Great Lakes crawling east. Another upper low over the western U. Highs, therefore, should be warmer and closer to normal in the 50s.
CAA behind the front that moved through overnight will continue to bring much cooler temperatures today with highs reaching the upper 50s to upper 60s. High pressure moving into the region will bring VFR conditions with mostly clear skies. Diegan Chattanooga Airport, TN 43 67 49 62 45 / 0 0 30 50 10 Knoxville McGhee Tyson Airport, TN 40 65 47 59 44 / 0 0 20 60 10 Oak Ridge, TN 39 66 46 59 43 / 0 0 20 50 10 Tri Cities Airport, TN 35 62 41 59 42 / 0 0 0 40 20.
129 PM EDT Thu Apr 15 2021 Scattered rain showers are expected this afternoon, with both rain and snow showers possible north and in the ridges tonight and Friday morning as low pressure crosses. Thermal profiles suggest a transition to rain/snow mix, with snow limited to the higher elevations and portions of the I-80 corridor. Though the growing season is underway for many of our southern forecast points and just above freezing overnight temperature, frost remains unlikely given excessive cloud cover and turbulent winds preventing development. Pressure heights will slowly rise as the upper low pulls farther east toward the New England coast Friday.
329 PM EDT Thu Apr 15 2021 A series of troughs will rotate across the region through the weekend. Lake effect cloud cover will keep northeast Ohio into northwest Pennsylvania cooler. Upper level low will slowly move from the central Great Lakes to north central PA through the night. A stronger trough will sweep across the region late this afternoon into the evening with an increase in the showers expected. For now it looks as if it will mainly be the higher terrain of NW PA. Elsewhere highs will range from the lower 40's to mid 50's. Lows will range from the lower 30's to upper 30's.
More widespread rain showers will develop through the day Friday as main upper low shifts east into the Central Plains.
Friday will also see fewer clouds for most locations, allowing for a slightly warmer day, compared to today (Thursday).
151 PM EDT Thu Apr 15 2021 An upper low, centered over southeastern Lower Michigan this midday hour, will drift southeast slowly cross PA through Friday. Colder air will sweep across the region today and turn the temperatures much cooler for the next few days. Some snow will fall across the higher terrain of the north and west later today into Friday and a light coating is expected across the ridgetops by daybreak friday.
333 PM EDT Thu Apr 15 2021 A cold front will push southeast of the area later today, as an upper level disturbance crosses the Carolinas. Cool and dry high pressure will build over the area from the northwest this evening through Friday. A dry secondary backdoor surface cold front will drop through the region Friday night.
347 PM EDT Thu Apr 15 2021 A pair of cold fronts will drop through today marking and end to the record breaking high temperatures we've had over the past few days. A line of showers and thunderstorms have sank south of the CWA border over the course of the morning and afternoon and dry air reinforced by NW flow aloft is bringing cooler temperatures and drier air steadily south across the region.
A cold front over southern Georgia will push across the area tonight. Temperatures will be a few degrees cooler on Friday especially near the coast as winds become northeasterly. Scattered afternoon showers/storms are possible on Friday mainly over our southern tier counties due to impulses in the wnw flow aloft and proximity to the slowing cold frontal boundary.
The low pressure system in northern Nevada is still spinning bands of clouds and precipitation into southern Idaho just north of the Nevada boarder this morning. Temperatures should be warm enough to prevent snow accumulations on pavement surfaces which should warm well above freezing later this morning.
253 PM CDT Thu Apr 15 2021 Upper level low is located across the central Rockies region this afternoon. Deep lift within area of upper level divergence across western CO just ahead of the low with lightning observed across that area. As the upper low moves into CO this evening, mid-level FGEN increases from the Panhandle into southwest Nebraska. The upper low tracks across southern NE during the day Friday. Accumulation during the day Friday will become more difficult due to the high mid April sun angle and surface temperatures a few degrees above the freezing mark.
A weak front pushed on through early this morning, and dry cooler air is settling in behind. with dewpoints around freezing. Weak upper ridging will quickly move east early Fri night, and another weak upper trough axis will push into the MS river early Sat, with a weak front just ahead. And preceding this wave, a weak cold front will push through Tue night. VFR will continue through the next 24 hours with dry high pressure.
1159 AM EDT Thu Apr 15 2021 High pressure will remain across the region today.
221 PM CDT Thu Apr 15 2021 (Issued 220 PM CDT Thu Apr 15 2021) Tonight through Friday night: North to northwest flow remains in place across the region today, as the area is situated between a closed low across the eastern Great Lakes and another closed low over the Rocky Mountains. Lows tonight will fall into the low to mid 30s. Highs away from Lake Michigan will warm into the mid to upper 50s, with cooler readings in the 40s near the lake.
1001 AM MDT Thu Apr 15 2021 Sent an update this morning to remove the mention of fog and freezing rain as most observations have shown it ending. Today, the closed low pressure center from the Great Basin is moving northeast through Wyoming and slowly re-connecting with a new low pressure trough descending from Saskatchewan. Previous discussion: Overnight low stratus, patchy freezing drizzle, and patchy fog will linger into the morning hours across NE Montana. Light rain and snow showers will remain possible at times through the day as low pressure tracks east across Wyoming. Any precipitation will shift south for Friday as high pressure moves into southern Saskatchewan.
Given dewpoints are mostly in the lower 30s, anticipate temperatures will fall several degrees with onset of precipitation due to evaporation. -Howerton A mid/upper trough over the Central Great Basin area early this morning will move slowly eastward into the Central Rockies tonight before emerging over the Central Plains on Friday.
Lower heights over the southeastern United States have nudged the mean layer ridging to the southwest towards Central America. Temperatures across the Florida Keys are in the lower to mid 80s with dewpoints near 70.
1229 PM CDT Thu Apr 15 2021 The main concern this forecast package will revolve around frost and freezing conditions this morning. With a few more hours of good radiational cooling conditions, temperatures are expected to bottom out just below freezing across northwestern Missouri. Tonight, a upper level trough over the Great Basin region will finally begin shift east into the western High Plains. This will lead to a cool and cloudy day on Friday with highs in the low to mid 50s. Friday evening into Friday night, the upper level trough will move into the region continuing shower chances.
Meanwhile, a cold front will continue southward across North Texas, reaching the north edge of our CWA by sunset Friday evening. This trough will also serve as a source of lift, especially over the Rio Grande Plains late tonight and Friday morning. Last, but not least, the Low Level Jet will reach it's diurnal peak late tonight and wane by late Friday morning, also providing a source of lift/moist air feed for convection. The cold front will then sweep through the area Friday evening and overnight, ending rain chances and ushering in cooler and drier air.
Nice afternoon setting up as a cold front that passed earlier today now well south, and clouds now clearing behind.
Nice afternoon setting up as a cold front that passed earlier today now well south, and clouds now clearing behind. VFR will continue through the next 24 hours with dry high pressure.
Only exception will be the development of some MVFR CIGS over the northwestern portion of the forecast area (KHRO, KBPK) after midnight tonight into early Friday morning as low pressure and increasing low level moisture approach from the east. Scattered showers will develop area-wide from west to east mainly after 10Z as the low level moisture ramps up across the rest of the forecast area. Frontal boundary stalled along the Gulf coast will shift back to the north late tonight into Friday, with low pressure developing along it. The aforementioned low pressure will drag a cold front through the region Friday night, with precip ending behind it and drier air moving in.
A few showers may develop on the backside of the exiting upper level low today over the northeast corner of Lincoln County and the Sierra but not expecting any lightning activity with little to no instability present. An upper-level area of low pressure has been parked over northern Nevada for the last couple of days, bringing with it areawide breezy to gusty winds, cooler temperatures, and southern Great Basin showers and isolated storms. This area of low pressure will push eastward through the day today, leaving an elongated trough over the region.
Ridging aloft and inverted surface ridging extending from expansive Canadian high pressure will result in a pleasant but cool day today. Latest surface analysis places a string of low pressure centers from NY SW to Cincinnati with the cold front currently extending NE-SW across LEX to BNA. 5H analysis shows two closed lows, one over the Intermountain West and the other over the Great Lakes, reminiscent of the eyes of Dr. Closed low over the Rockies opens up as it moves out onto the Central Plains, but a fairly unsettled pattern will persist for much of the weekend as broad and ill-defined upper trofiness settles over the Upper Midwest and the Great Lakes. Next cold front drops in Tue night/Wed, but moisture supply is questionable as the boundary approaches the Ohio Valley.
Clouds cover the area, though noticing some holes in the low cloud deck in Ontario around Kenora and east and even a few peeks of sun on the Lake of the Woods webcam NW of Baudette. Plenty of cloud cover under the high, extending from ND well into south central Canada. Leaned toward the cooler side of guidance with highs only in the upper 30s to low 40s. Friday night through next Thursday, look for generally cooler than average temperatures with minimal chances for weather impacts across the period.
309 PM CDT Thu Apr 15 2021 This afternoon, the double closed low pattern continued at the upper levels with one low progressing east near the Great Lakes and the other spinning over the Intermountain West. In between, brief ridging was present over the Plains with clouds increasing ahead of the western trough. With partly to mostly cloudy skies, temperatures have been a bit cooler than yesterday having warmed into the mid to upper 50s this afternoon.
1146 AM EDT Thu Apr 15 2021 An upper low, centered over southeastern Lower Michigan this midday hour, will drift southeast slowly cross PA through Friday. Colder air will sweep across the region today and turn the temperatures much cooler for the next few days. Some snow will fall across the higher terrain of the north and west later today into Friday and a light coating is expected across the ridgetops by daybreak friday.
127 PM EDT Thu Apr 15 2021 Scattered showers later today ahead of a cold front will be followed by drier and cooler conditions Friday.
143 PM EDT Thu Apr 15 2021 A series of troughs will rotate across the region through the weekend. Lake effect cloud cover will keep northeast Ohio into northwest Pennsylvania cooler. Upper level low will slowly move from the central Great Lakes to north central PA through tonight. A stronger trough will sweep across the region late this afternoon into the evening with an increase in the showers expected. For now it looks as it will mainly be the higher terrain of NW PA. Elsewhere highs will range from the lower 40's to mid 50's.
252 PM MDT Thu Apr 15 2021 The upper low is now across Utah into western Wyoming and will continue to move eastward into the central Great Plains later tonight and Friday. Though surface temperatures have been below freezing, snowfall has struggled to stick on the ground, due to warm ground temperatures and increasingly strong mid-April solar radiation.
253 PM CDT Thu Apr 15 2021 Upper low centered over UT this morning will pass over CO tonight as it opens up and move onto the plains Friday.
1256 PM CDT Thu Apr 15 2021 Water vapor satellite this morning shows the upper level low has moved to over northern Lower Michigan early this morning. Some drying is seen in the water vapor imagery over Lake Superior into southern Ontario in association with another mid-level short wave trough rotating around the low. Weakening upper level ridging will cross the area on Friday with moderating 850mb temps overhead. All this will allow for a noticeably warmer day with highs in the 50s to near 60, closer to normal for mid April.
115 PM CDT Thu Apr 15 2021 North flow will diminish after sunset as high pressure ridging builds southeast into the OH and TN valleys. The low level ridge axis will keep dry and stable air in place through Friday into Friday night. However, mid and high clouds will develop due to overrunning of the low level cool airmass. If the low levels can saturate a bit more quickly Friday evening, there could be a bit more.
343 PM EDT Thu Apr 15 2021 Scattered showers ahead of a cold front will linger into the evening with drier and cooler conditions for Friday.
For Monday a cold front starts to move toward the area. At the start of the period, an upper closed low is over Baja California with south/southwest flow across the southern Plain as a ridge progresses east of the tri-state region. Moisture continues to be filtered into the High Plains ahead of the Baja closed low as it moves into the southern portion of the Four Corners region.
A highly amplified pattern persists across the the nation today with a cut-off low over Southern California and a long wave trough over the Eastern Seaboard edging further away from the forecast area. In between, a ridge runs the length of the Great Plains into Canada. A weak cold front has edged into the northern portion of the forecast area, although the air mass is only slightly cooler and drier behind it. The building deep-layer ridging will dominate our weather for a while. Look for highs in the lower 80s in most areas with mid 80s across inland portions of our Florida zones. The deep layer ridging will continue to be the main forcing for the next few days.
408 AM EDT Mon May 8 2017 Chilly high pressure from central Canada will slide across the Great Lakes early this week. A warm front will develop over the lower Ohio Valley mid week but it will remain south of the area. Otherwise high pressure in the area so expect mostly sunny skies through the day. Models show a warm front to our southwest and by 12z Tuesday should be from near Peoria to Louisville.
Currently, an upper level trough was at the Alberta/Saskatchewan border with southwesterly flow aloft over the Dakotas. A surface cold front extended from eastern Saskatchewan through the western Dakotas.
123 AM EDT Mon May 8 2017 A high pressure ridge will bring mostly clear skies and temperatures in the thirties tonight. A warm front will work into the region Monday night bringing a chance of rain showers.
130 AM EDT Mon May 8 2017 Upper air pattern consists of a 500 mb ridge across the plains and troughs in the western and ern U. As a high pressure system builds into the region tonight into Monday winds will diminish to 20 knots or less and remain below 20 knots through the rest of the forecast period.
359 AM EDT Mon May 8 2017 A broad area of low pressure will continue to spin over the Northeast through the first half of the week.
An unusually strong upper level low will impact northern and central New Mexico during much of the week.
411 AM EDT Mon May 8 2017 A broad area of low pressure will continue to spin over the Northeast through the first half of the week.
333 AM CDT Mon May 8 2017 Warm and dry weather will continue through Tuesday while the upper low, currently off the Baja coast, makes slow eastward progress.
Weak high pressure will gradually build into the forecast area through this period, which should help clear out much of the cloudiness. Moisture wrapping around an upper level low pressure area over the Southwest U. This, along with the building high pressure aloft, will help warm high temperatures from the 50s and lower 60s today into the 60s to lower 70s for Tuesday.
315 AM EDT Mon May 8 2017 Slow evolving pattern as upper level low over southern Quebec is reluctant to break down and exit. Full sunshine today expected to yield maxes in the upper 50s, but dew pts holding in the 20s setting the stage for another cold night tonight, mins around freezing, which should be conducive for frost formation with winds going calm.
High pressure is pressure is expected to remain over the area through mid week bringing dry weather and warming temperatures inland. An upper level trough will bring cooler conditions and the chance for rain late in the week. High pressure continues to build into the pacific northwest and an upper level low continues to slowly sag south over southern CA. Temperatures aloft are warming and this is showing up this morning on the ridges and in the Mckinleyville profiler. Low temperatures in the valleys will remain fairly similar or warm slightly while the ridges will continue to warm. This is due to an approaching upper level low.
404 AM EDT Mon May 8 2017 A broad area of low pressure will continue to spin over the Northeast through the first half of the week.
1107 PM MDT Sun May 7 2017 20z surface analysis had low over southeast MT with lee trough into western NE and cold front into southwest WY. Water vapour matinee showed upper ridge shifting east of the CWA with upper low spinning over CA. Temperatures will be noticeably cooler, but seasonal.
Minimum temperatures should range from the upper 20s across the Alleghenies to the mid/upper 30s across the lower Susquehanna Valley. Unseasonably cool/broad cyclonic flow continues to dominate the large scale pattern on Monday as deep upper low remains nearly stationary over western New England. Persistent trough wanders off to the NE by midweek, with flat flow over PA, though weak ridge nosing into the Ohio Valley (over a weak W-E oriented stationary surface front to our south). This should be enough to give us a period of dry weather between the showers rotating around the low to our north/east and showers off to our south.
These northerly winds will help to reinforce the some cooler air across SW VA and far NE TN -- keeping highs in the low to mid 60s.
320 AM EDT Mon May 8 2017 High pressure should maintain mainly dry weather through the first half of the week. Mid level clouds should continue crossing the area early this morning as a weak upper trough rotates around an upper low across NY.