Aikyam-Lab/Synoptic-Bench huggingface dataset:
The forecast area is under deep southwest flow aloft with a low pressure system across parts of Canada into Montana and Idaho. Warmer temperatures are expected with readings in the low to mid 70s. Low temperatures range from the low to mid 30s in far eastern Colorado, upper 30s to upper 40s elsewhere, mildest in the Norton and Hill City areas.
343 AM PDT Tue Mar 31 2020 A weak low pressure system well off the northern Baja coast will spread high clouds across southern California today with inland high temperatures a few degrees warmer.
Cold front is currently moving thru northern parts of southeast Texas and should be off the coast by mid morning.
628 AM EDT Tue Mar 31 2020 Upper level low pressure remains over the area through Tuesday. Early this morning rounds of snow showers continue to rotate through western Maine and into New Hampshire as an area of upper level low pressure stalls and reorganizes just offshore. It will be a similar story tonight and Wednesday as the upper low continues to wiggle around over New England.
347 AM MDT Tue Mar 31 2020 Colder air moves into the region today as a Canadian cold front pushes southward through North Central Montana.
609 AM CDT Tue Mar 31 2020 An upper level system moving toward MO/AR continued to produce widespread rains from the Ozarks to the lower Ohio and lower/mid Mississippi Valley regions. Tonight, high pressure will move across the area resulting in cool temperatures, and possibly some frost, something we haven't seen in a while.
815 AM MDT Tue Mar 31 2020 Made updates to provide better spatial and temporal resolution with regards to the cold front passage this morning through this evening using hi-res model data.
Winter Storm will impact parts of NE Montana tonight and A cold front will move through eastern Montana this morning with a chance of rain and cooler temperatures today. A much stronger cold front will move through the area tonight and Wednesday morning that will bring snow which will be followed by winter like temperatures. An upper trough will move into the region behind the wave on Wednesday with an upper low over Alberta.
Cooler tonight into Wednesday with snow showers expanding a little further south, to include most of Humboldt and Elko Counties, along with portions of northern Lander and Eureka Counties.
Strong mid-level jet, beneath the upper trough centered over BC, continues to force light precipitation across the far northern portion of California.
704 AM CDT Tue Mar 31 2020 High pressure remains in control today, with another seasonable day in store for most of the area. East winds in the low levels have led to some Lake Michigan enhanced clouds across parts of eastern into central Wisconsin as of 2 am. A large scale trough currently sitting just off the coast of the Pacific Northwest will be the system to watch as it brings a few waves of precipitation for the remainder of the week into the weekend. Some mix with snow is possible at the onset on Wednesday morning as overnight lows are expected to be in the low to middle 30s.
As the upper level trough continues to progress eastward, these ceilings will improve to MVFR status during the morning into early afternoon hours. /Today through Wednesday/ The cold front is shifting east across our eastern zones this morning and is ending precipitation from west to east as it does so. Skies will clear and winds will decouple tonight as high pressure builds in at the surface; there may be some patchy fog around the region as a result. High temperatures will warm back into the 70s on Wednesday as upper level ridging builds in from the west.
Colder air moves into the region today as a Canadian cold front pushes southward through North Central Montana.
High pressure will result in dry weather through the latter half of the week. Temperature will drop near the norm tonight and with it, any light precipitation in places near freezing may see light snowfall of up to a couple tenths of an inch, most likely in Eastern Tucker county.
205 PM CDT Tue Mar 31 2020 Satellite shows high clouds are increasing which favoring warmer low temps for Wed AM. Lee trof will form in ern NM and the Upper Trans Pecos Wed under westerly mid-level flow and result in southerly surface winds across most areas. High temps will respond accordingly with the warmest conditions in close proximity to the lee trof, however high clouds will limit insolation and generally near seasonal high temps are expected. A trof passing well to the n will drive a front Fri s, probably arriving in the nrn PB before 00Z/Sat. Low-level mstr will be present Sat PM across the Lower Trans Pecos-Big Bend and a few -TSRA will be possible. Chances for precip will improve Sat night- Sun PM when a shrtwv trof is likely to move across srn NM.
Low pressure will move over the Plains on Wednesday. At first, this feature and an upper ridge will bring warmer temperatures in the 60s on southerly flow, as well as a shower or two across the east with the llj. The upper trough and northerly winds will move in Wednesday night, accompanied by some mixed precipitation.
Models have continued the trend that started last night of limiting the amount of precip ahead of the warm front coming in tonight. Wednesday night, the main cold front finally starts approaching western MN, with showers finally starting to develop as low level WAA strengthens.
Have kept going highs in the lower 60s in these areas with mid-upper 50s over south central Illinois. Mainly just light rain will continue over parts of southeast MO and southwest IL until noon when the upper level trough shifts east of our area. Cooler high temperatures can be expected today due to the cloud cover this morning and a northerly surface wind. There may be patchy frost late tonight/early Wednesday morning with a mostly clear sky and light winds along with a few colder, low lying areas dropping down to near the freezing mark, mainly across west central and southwest IL. A warming trend will begin Wednesday afternoon as an upper level ridge builds over the central US, and as the surface/low level winds become southerly as the surface/850 mb ridge shifts east of our area.
A large scale upper level trough will remain over the region keeping us under a moist and cool westerly flow. Broad westerly flow will keep moist flow over the Pacific Northwest, as a trough deepens through Wednesday. The axis of the trough will then move eastward later Wednesday.
1049 AM CDT Tue Mar 31 2020 High pressure will dominate the Midwest over the next few days bringing dry conditions. Temperatures should be a little cooler today, and then slowly warm through the rest of the week.
1008 AM CDT Tue Mar 31 2020 Cold front as of 10 am CDT, has just moved passed KARA and extends into the Gulf about 30 miles off the southeast Texas coast. A cold front is working its way across the East Texas Lakes region this morning. Through the morning a weak area of low pressure will move east from Texas and across the lower Mississippi Valley and the associated cold front will push south and east. A secondary cold front will also pass through the region later today or this evening, but no convection is expected with this boundary.
1206 PM CDT Tue Mar 31 2020 High pressure remains in control today, with another seasonable day in store for most of the area. East winds in the low levels have led to some Lake Michigan enhanced clouds across parts of eastern into central Wisconsin as of 2 am. A large scale trough currently sitting just off the coast of the Pacific Northwest will be the system to watch as it brings a few waves of precipitation for the remainder of the week into the weekend. Some mix with snow is possible at the onset on Wednesday morning as overnight lows are expected to be in the low to middle 30s.
It will be much warmer by the end of the week, with highs into the lower 60s.
147 PM EDT Tue Mar 31 2020 A low pressure system will cross the area this afternoon and will bring widespread showers and a few thunderstorms.
We may see few breaks in the lower level cloud cover this evening, before more low-level cloud cover looks to move in over northeastern IL overnight and into early Wednesday morning. Temperatures also should begin to rebound back into the low 50s, especially for inland areas. This should promote a better lake push of east- northeasterly winds Wednesday afternoon, thus supporting cooler conditions (in the 40s) near the lake. KJB 335 AM CDT Upper flow becomes increasingly amplified mid-week, with deep troughs centered over the northwest and off the east coast resulting in a slow-moving pattern aloft.
1222 PM EDT Tue Mar 31 2020 A low pressure system will cross the area this afternoon and will bring widespread showers and a few thunderstorms.
943 AM PDT Tue Mar 31 2020 A weak low pressure system well off the northern Baja coast will spread high clouds across southern California today with warm weather for the region.
A high pressure center will pass directly overhead late in the day, ensuring mainly sunny skies and light winds.
142 PM PDT Tue Mar 31 2020 A weak low pressure system well off the northern Baja coast will spread high clouds across southern California into this evening with seasonal temperatures.
1214 PM CDT Tue Mar 31 2020 Updated aviation section for 18z taf issuance An upper level system moving toward MO/AR continued to produce widespread rains from the Ozarks to the lower Ohio and lower/mid Mississippi Valley regions. Tonight, high pressure will move across the area resulting in cool temperatures, and possibly some frost, something we haven't seen in a while.
These mid-high clouds are associated with an upper low currently over the Ohio Valley, and these clouds will move out of the area as the low moves east late this afternoon. Even with the cold start tomorrow, expect a decent warmup over much of the CWA with plenty of sunshine and the low levels of the atmosphere beginning to warm up.
However upstream warm air advection ahead of slowly advancing cold front in the plains will bring increasing mid-high level clouds back into the area Wednesday night.
319 PM EDT Tue Mar 31 2020 Weak high pressure building into the region this afternoon will continue to bring clearing skies this evening and dry weather on Wednesday with increasing clouds through the day.
325 PM EDT Tue Mar 31 2020 Low pressure will track across South Carolina and off the Outer Banks this afternoon and tonight, bringing rain to all locations tonight.
High RH values within the low- levels will readily allow for light showers this afternoon/evening as diurnal heating provides sufficient lift. The setup is similar today with a segment of the upper level trough lingering over Lower Michigan to provide some weak vertical motion support. Daytime warming on the last day of March does the rest by generating weak instability within the low levels that show steeper lapse rate and a moist low level profile in models soundings. This process will delay the arrival of upper ridging which promises to bring improved conditions late in the week.
Tonight, we'll see weak ridging pass over the region then southwest flow enters late morning. Broad southwesterly flow is expected to become established tomorrow evening as an upper level low complex remains nearly stationary across the western Canadian Prairies and Canadian Rockies.
1247 PM CDT Tue Mar 31 2020 High pressure will dominate the Midwest over the next few days bringing dry conditions. Temperatures should be a little cooler today, and then slowly warm through the rest of the week.
Winter Storm will impact parts of NE Montana tonight and Complex winter storm will feature the secondary cold front moving through the CWA tonight and Wednesday morning. A closed upper low will continue drifting southeast and moisture and energy to override this cold air, bringing moderate to possibly heavy snow at times late tonight/Wednesday, especially for the western zones.
310 PM CDT Tue Mar 31 2020 This Evening through Tomorrow: In the wake of the low pressure system which moved through earlier today, gusty northwest winds and a broken deck of stratus are keeping temperatures cooler across the area.
Some typically cool spots over the east could see lows near freezing.
346 PM EDT Tue Mar 31 2020 Aviation section updated Low pressure in place across the deep south is expected to exit to the east tonight. This will allow cool high pressure in place across Ontario to build southward through the Ohio Valley.
Patchy MVFR conditions should trend toward VFR and is expected to remain there thru the remainder of the forecast with high pressure building into the region. High pressure is building into the region at the surface. MVFR/IFR cigs will prevail early in the period as a an upper level trough axis clears the area. /Issued 319 AM CDT Tue Mar 31 2020/ Early morning water vapor imagery detects an upper cyclone along the KS/OK border, and precipitation has expanded in coverage over northeast OK as moisture wraps around this system. The upper low and associated precipitation will shift quickly east this morning, with rainfall tapering off by mid/late morning.
High pressure is building into the region at the surface. MVFR/IFR cigs will prevail early in the period as a an upper level trough axis clears the area. /Issued 319 AM CDT Tue Mar 31 2020/ Early morning water vapor imagery detects an upper cyclone along the KS/OK border, and precipitation has expanded in coverage over northeast OK as moisture wraps around this system. The upper low and associated precipitation will shift quickly east this morning, with rainfall tapering off by mid/late morning.
This is also helping to warm temperatures a few degrees into the low 50s.
/issued 1008 AM CDT Tue Mar 31 2020/ Cold front as of 10 am CDT, has just moved passed KARA and extends into the Gulf about 30 miles off the southeast Texas coast. A cold front is working its way across the East Texas Lakes region this morning. Through the morning a weak area of low pressure will move east from Texas and across the lower Mississippi Valley and the associated cold front will push south and east. A secondary cold front will also pass through the region later today or this evening, but no convection is expected with this boundary.
Winter Storm will impact parts of NE Montana tonight and First cold front moving east through the eastern zones. Second cold front moving into north-central Montana this morning will be the one to watch the next 24 hours. TFJ A cold front will move through eastern Montana this morning with a chance of rain and cooler temperatures today. A much stronger cold front will move through the area tonight and Wednesday morning that will bring snow which will be followed by winter like temperatures. An upper trough will move into the region behind the wave on Wednesday with an upper low over Alberta.
Low pressure in place across the deep south is expected to exit to the east tonight. This will allow cool high pressure in place across Ontario to build southward through the Ohio Valley.
Light to moderate showers continue across the region this morning out ahead of a potent H5 trough over the Midsouth region and beneath an eastward moving coupled jetmax. Chattanooga Airport, TN 53 40 59 41 66 / 100 20 0 0 0 Knoxville McGhee Tyson Airport, TN 52 39 54 40 63 / 100 50 0 0 0 Oak Ridge, TN 53 40 54 40 64 / 100 50 0 0 0 Tri Cities Airport, TN 51 38 52 37 61 / 100 90 10 0 0.
Southerly flow will commence and become gusty across northern and western portions of Oklahoma by sunrise tomorrow as lee trough becomes established.
Short wave ridging and warm advection on tap for tomorrow will transition to the passage of a long wave trough through the northern Plains driving a frontal passage with appreciable temp changes and precip. This will quickly be followed by a transition to more progressive, zonal flow early in the weekend and then very warm, southwest flow ahead of the next long wave trough passage to end the period. However later 1-3km thermodynamic forcing, with warm/theta-e advection and frontogenesis, will follow with the aforementioned ridging and produce a brief period for showers north early in the morning leading into a warm day with widespread 60s+ for highs.
300 PM EDT Tue Mar 31 2020 Low pressure will track across South Carolina and off the Outer Banks this afternoon and tonight, bringing rain to all locations tonight.
207 PM CDT Tue Mar 31 2020 A semi-permanent upper level low over western Canada will be the driving force for the upcoming week with several disturbances expected to rotate around the base of this upper low.
144 PM PDT Tue Mar 31 2020 A weak low pressure system well off the northern Baja coast will spread high clouds across southern California into this evening with seasonal temperatures.
Given the highs today went several degrees cooler than the NBM numbers. Wednesday Night Through Tuesday Ridging at 500mb across the western Great Lakes region noted at the beginning of the period as a 500mb trough meanders across western Canada into the northwest United States through the end of the work week.
Light to moderate showers continue across the region this morning out ahead of a potent H5 trough over the Midsouth region and beneath an eastward moving coupled jetmax. CDG Chattanooga Airport, TN 40 58 41 66 46 / 10 0 0 0 0 Knoxville McGhee Tyson Airport, TN 40 54 40 63 43 / 70 0 0 0 0 Oak Ridge, TN 40 54 40 64 43 / 30 0 0 0 0 Tri Cities Airport, TN 40 51 37 61 38 / 90 10 0 0 0.
Made updates to provide better spatial and temporal resolution with regards to the cold front passage this morning through this evening using hi-res model data.
Highs on Wednesday will top out in the low 70s across the area.
High pressure builds into the region through the short term.
I put drizzle in the forecast for Wednesday as much of the day we'll be warm advecting high PWAT air into the region as an area of low pressure sneaks slowly in from the southwest.
Some chance for a light sprinkle from low cloud deck over portions of northern Mississippi, but breaks in the low level clouds should allow for enough mixing to bring POPs below mentionable the rest of today. /NF/ Prior discussion below: Early this morning, a low pressure system and attendant cold front move through the region, with convection along the boundary early this morning. Storms will continue through the early morning, and most of the storms should have exited the region by mid morning, though some lingering sprinkles may remain, particularly in the north closer to the upper level low/cyclonic flow.
307 PM CDT Tue Mar 31 2020 Nice weather is expected for the next couple of days as a high pressure system brings a dry continental air mass to the region. Rua A cold front has swept through the forecast area with a drier continental air mass now settling in. This air mass will persist for the next few days bringing with it cooler more seasonable conditions, especially at night, along with mild days.
A chilly and quiet night is in store as high pressure begins to move into the Tennessee Valley. Lows will be in the mid 30s for most of the area, but some isolated areas in the low 30s aren't out of the question.
/issued 205 PM CDT Tue Mar 31 2020/ Satellite shows high clouds are increasing which favoring warmer low temps for Wed AM. Lee trof will form in ern NM and the Upper Trans Pecos Wed under westerly mid-level flow and result in southerly surface winds across most areas. High temps will respond accordingly with the warmest conditions in close proximity to the lee trof, however high clouds will limit insolation and generally near seasonal high temps are expected. A trof passing well to the n will drive a front Fri s, probably arriving in the nrn PB before 00Z/Sat. Low-level mstr will be present Sat PM across the Lower Trans Pecos-Big Bend and a few -TSRA will be possible. Chances for precip will improve Sat night- Sun PM when a shrtwv trof is likely to move across srn NM.
Wednesday will be mostly dry and a few degrees warmer as west- southwesterly flow aloft continues across the state. At that time, there is a pretty decent upper trough northwest of Colorado over the northern Rockies.
North winds will persist through tomorrow as high pressure starts to slowly move east of the area.
A cold front has pushed through most of the forecast area but has stalled near the ID/NV border. Daytime highs today were highly dependent on the front, with Boise recording a high of 53 between 11 am and noon while Twin Falls, ahead of the cold front longer, made it up to 60 around 2:30 pm. The cold core of an upper trough will move overhead tomorrow.
Tonight, we'll see weak ridging pass over the region then southwest flow enters late morning. Broad southwesterly flow is expected to become established tomorrow evening as a complex upper level low remains nearly stationary across the western Canadian Prairies and Canadian Rockies.
534 PM EDT Tue Mar 31 2020 Light showers are possible this evening and Wednesday, especially for southern portions of the region, as low pressure passes to our south. Dry weather with high pressure is then expected for the latter half of the week. Temperature will drop near the norm tonight and with it, any light precipitation in places near freezing may see light snowfall of up to a couple tenths of an inch, most likely in Eastern Tucker county. Dry weather and clearing skies are then expected through the short term as high pressure builds across the region.
657 PM CDT Tue Mar 31 2020 Sunny skies and seasonable temperatures will reign for the remainder of the day as a weak high pressure ridge remains in control of the region. This high pressure ridge will continue to build during the day and overnight tonight.
914 PM EDT Tue Mar 31 2020 Light showers will linger through Wednesday for southern portions of the region as low pressure passes to our south. Dry weather with high pressure is then expected for the latter half of the week. Temperature will drop near the norm tonight and with it, any light precipitation in places near freezing may see light snowfall of up to a couple tenths of an inch, most likely in Eastern Tucker county. Dry weather and clearing skies are expected through the short term as high pressure builds across the region.
536 PM MDT Tue Mar 31 2020 Latest analysis shows the broad upper low complex is still in place over southwestern Canada and the northwestern CONUS. The main upper low is currently centered over Alberta with another upper low/trough dropping southward into the Pacific Northwest on the west side of the broad upper circulation.
745 PM EDT Tue Mar 31 2020 Low pressure will track across South Carolina and off the Outer Banks this afternoon and tonight, bringing rain to all locations tonight.
MVFR conds will be possible between 09/14z across mainly C and Srn terminals with patchy fog possible beneath an area of high pressure.
312 PM MDT Tue Mar 31 2020 Latest analysis shows the broad upper low complex is still in place over southwestern Canada and the northwestern CONUS. The main upper low is currently centered over Alberta with another upper low/trough dropping southward into the Pacific Northwest on the west side of the broad upper circulation.
A closed system of low pressure over Alberta is the centerpiece of a broad trough over much of the Pacific Northwest today. Moisture from the west is streaming up from the Pacific, while a cold front associated with the Canadian low- pressure center moves over the Continental Divide from the east later tonight. Tonight into Wednesday morning a Canadian cold front will cross the Continental Divide into northwest Montana.
/GG/ Prior discussion below: This Evening through Tomorrow: In the wake of the low pressure system which moved through earlier today, gusty northwest winds and a broken deck of stratus are keeping temperatures cooler across the area.
However, there could also be some showers over the Lower Columbia Basin before sunset.
942 PM EDT Tue Mar 31 2020 Low pressure will bring light to moderate rain tonight. Behind the departing system, cooler and drier air will build across the area through the weekend. Clouds should gradually clear from west to east late Wednesday morning through the afternoon as high pressure builds in. Clearing skies and lighter winds Wednesday night should allow good radiational cooling, and lows should reach the lower 40s away from the beaches.