Aikyam-Lab/Synoptic-Bench huggingface dataset:
1222 AM MDT Mon May 1 2023 Omega block pattern setting up over our area right now, ridge over Montana bookended by two troughs, one at each coast.
(Today through Tuesday) Center of a broad upper level trough is currently near the Great Lakes with the trough encompassing almost 2/3's of the country which is basically from the Rockies and eastward. The center of the upper low will track northeastward today.
123 AM PDT Mon May 1 2023 Cooler than average temperatures for most of this week.
Through sunrise, the combination of dry air and light winds will allow temperatures to fall well down into the 30s, with some north/northeast zones touching freezing for an hour or two. Amplified ridging over the Rockies will amplify further today, as an impressively strong synoptic omega block establishes over North America. Benign dry NWly midlevel flow will continue east of the ridge, with few clouds and nearly full early May sunshine.
(Today and tonight) A weak cold front will move south of the I-10 corridor before washing out this morning. No rainfall today and tonight with upper ridging suppressing storm development.
The net result will be a cooler than normal night for the end of April into the first of May with many areas dipping into the upper 40s F to near 50 F.
Today looks like a fairly nice day as well with comfortably warm temperatures and a mix of clouds and sun with the ridge still over the area. However, most of the lower elevations should see another dry day.
1228 AM CDT Mon May 1 2023 (This evening through Monday) An omega block was taking shape across the CONUS late this weekend with West Texas on the east side of the ridge.
An upper level low pressure system over Michigan was bringing moisture all the way from the Atlantic Ocean across New England, Quebec, Ontario and then into Upper Michigan and the Northeast third of Wisconsin. Two coupled jet streaks at 500mb are forecast to rotate around the upper low across Northeast Wisconsin this morning, while there is strong warm air advection and convergence at low levels. Think that snow will fall across Eastern WIsconsin this morning but figuring out snow accumulations is difficult due to warm pavement and air temperatures near or just above freezing. Temperatures today will be around 20 degrees cooler than normal, and lows tonight about ten degrees cooler than average. Highs tomorrow will be about fifteen degrees cooler than average.
136 AM EDT Mon May 1 2023 An upper level low migrating through the Great Lakes will result in a prolonged period of unseasonably chilly, breezy, and cloudy conditions, with rain chances through the first part of the workweek.
216 AM EDT Mon May 1 2023 Sharply colder air will filter in overnight and persist through Tuesday as a deep low pressure system forms across the Great Lakes. West-northwest winds will gust up to 35 to 45 mph today into this evening, with high temperatures in the low to mid 40s and overnight lows in the 30s. Deepening upper low will work across Lower MI for the start of the period and slowly translate into western Ontario by 18Z Mon. Highs will only be in the low to mid 40s and honestly could see some spots staying in the upper 30s. After Tuesday, dry and warmer weather is expected for the rest of the week.
304 AM EDT Mon May 1 2023 Discussion/Marine - Unsettled Through Tuesday - A stacked cold core low will continue to rotate overhead through Tuesday resulting in generally cooler temps and wet conditions. But again, given the above freezing air temps and even warmer ground temperatures, we do not anticipate major impacts.
254 AM EDT Mon May 1 2023 Gusty winds will continue through Tuesday as a strong trough dominates the weather over the Eastern CONUS. A drier and cooler air mass will be in place through mid to late week as the upper pattern is slow to change. A cooler day is expected despite abundant sunshine with forecast highs in the upper 60s to lower 70s. Anomalously deep cut off upper low centered over the Great Lakes and Ohio Valley moves slowly east and continues to dominate the eastern CONUS. Pressure ridge from the Midwest slides southeast toward the lower Mississippi Valley.
1254 AM CDT Mon May 1 2023 (Tonight through Monday night) Southerly low level flow will increase to 30 knots over the Brush Country and to 20 knots for the coastal plains tonight due to a low pressure area over southwest Texas. The surface winds will remain slightly elevated tonight and keep minimum temperatures around 10 degrees warmer than this morning. With the low pressure area over southwest Texas, the winds will increase Monday with breezy conditions over the Coastal Bend in the afternoon. Lows will be in the lower to mid 60s inland to around 70 coast and along the Rio Grande Monday night.
WV imagery this morning is a bit of deja vu, with the eastern trough just lumbering over the great lakes for another day. Once again, we should remain below advisory criteria, with slight further east shift of the upper low, forecast soundings suggest a slightly weaker 850 jet to tap into with the modest low level lapse rates, so surface winds around 15 to 20 mph gusting 30 to 35 mph are most likely. Temperatures will be slightly warmer, but still a bit cooler than normal, lower to mid 60s.
(Today) Quiet/unseasonably cool wx conditions are expected across the mid TN Valley starting the new work week, as a large area of high pressure out of the northern Plains gradually begins to build towards the SSE.
240 AM EDT Mon May 01 2023 High pressure will bring drier, gusty, and much cooler conditions through mid-week. The cold front extended from near Sanford to Raleigh, Louisburg, and Warrenton moving quickly SE at 930 PM. Multiple low pressure centers will be around the Great Lakes Monday morning, and these low pressure centers will move little over the next 48 hours. Tonight's cold front will bring a return to cooler weather, with highs in the 60s and lows in the 40s both days. Our weather will continue to be influenced by the large closed low moving across the eastern Great Lakes and New England regions.
Winds will begin to settle down after sunset, with low temperatures falling into the lower 50s in SE GA and lower 60s in NE FL.
225 AM CDT Mon May 1 2023 Expect few if any clouds this entire short term period, despite north to northwesterly flow at 500mb as 2 large lows rotate around the Lower Great Lakes and along the west coast. A ridge will remain squished between the 2 lows, stretching from MT to CO and TX. At the surface a ridge of high pressure set up from central canada through the western Dakotas through OK will continue to shift east across our region as it builds. The region will be situated between a large upper level trough over the eastern half of the country and ridging over the Rockies Tuesday night.
omega blocking pattern will keep things dry for the next couple of days. EC and GFS ensemble max Temps for today are a couple of degrees cooler than what the NBM is showing. 500hpa ridge currently west of the FA will move to the east and breakdown. With a more active flow regime setting up for the end of the week, increasing clouds, cooler temps and increasing chcs for pcpn are all in store.
This low has continued to decrease in pressure, leading to a tighter surface pressure gradient that has spread across the southeast. Highs will only reach into the mid 60s and it will feel cooler than that since there will be a steady breeze.
- Warmer and drier to start the work week. These have been most likely across western Minnesota where clear skies have allow the sun the heat the surface more, allowing for more efficient mixing of the high winds aloft down to the surface. Farther east into eastern Minnesota and western Wisconsin have remained cloudy with lighter winds due to a less favorable setup for mixing of the higher winds aloft. Winds should calm some tonight as the surface cools and we no longer mix the higher winds to the surface. Monday will see the low farther away such that the chances for wrap around precipitation will be greatly reduced. The low being farther away and the high moving in will also provide more sun to much of the region with only western Wisconsin still likely seeing more clouds than sun.
(Today through Tuesday) Upper air analysis this morning shows northwesterly flow over Texas between a trough over the eastern half of the country and a ridge over the west. The low level flow will be from the south to southeast bringing moist air back to the region.
1227 AM CDT Mon May 1 2023 (This evening through Tuesday) A cold front has completed the journey through the Natural State and now resides across the I-20 corridor in Louisiana and Mississippi. Behind this cold front has been a tight pressure gradient that has resulted in gusty winds being noted across Arkansas. The lower temperatures will be present in the far northwestern part of the CWA and along portions the higher terrain across the state.
The upper closed low located across the Great Lakes region has only shifted slightly eastward over the last 24 hours allowing for northwest flow to persist across the Plains. The cooler airmass behind last night's cold front along with the brisk northwest winds have limited warming today even with good insolation; temperatures top out in the low to mid 60s. However, temperatures will fall to near or just below freezing Monday morning in far north central Kansas, creating freeze conditions for any susceptible vegetation. The upper low translates farther east Monday and Tuesday with winds weakening slightly each day. Northwest flow gives way to upper ridging as the blocking pattern shifts by midweek.
Expect mostly cloudy skies for Tuesday with temperatures 5 to 10 degrees cooler as a result of the increasing moisture and cloud cover.
With this wind, temperatures today are much warmer than yesterday with most locations already in the 80s with 90s expected out west. With the higher dewpoints, nocturnal clouds and warmer lows return to the forecast with temperatures only reaching the lower to middle 60s by Tuesday morning.
(Today through Tuesday Night) Today, an upper level ridge over the Rockies/Great Basin will find itself caught between two troughs (centered over the West coast and Northeast CONUS respectively).
1116 PM EDT Sun Apr 30 2023 A deepening low pressure system and cold front will impact the region this evening.
The weak cold front that entered the region this morning will finally push through the entire CWA by sunrise Monday but will do little more than back the wind to the northeast across our Central Texas counties.
419 AM EDT Mon May 1 2023 A cold front over central PA will jump to the coast overnight, as a deep low forms off the northeast coast early Monday.
Southerly flow aloft has developed over the region with the ridge of high pressure just to the east of the forecast area. Locations with the highest probability of experiencing the stronger storms will be Clearwater County in Idaho, and locations near the Montana border (Thompson Falls, Noxon, Troy), and a few HREF members also show storms in the Bitterroot and Missoula valleys.
Persistent easterly flow over the plains will begin to increase low level moisture along and east of the mountains by late afternoon, with some pockets of modest instability (CAPE of 400-800 J/KG) developing near the high terrain.
Deep cyclonic flow will remain present across the region thanks to the large upper low over the Great Lakes region.
Our dew points are much cooler in the upper 30 and a range of 40s, so there is still plenty of room left to fall toward daybreak, and some of these clouds may clear by then as well. Could be some virga in NE LA, but too dry in the lower atmosphere to measure anywhere. Otherwise, tomorrow after will see more May sunshine and highs in the lower 80s. /24/ (Tuesday Night through Monday) Dry conditions expected through midweek with strong northerly flow prevailing aloft as an upper-ridge builds across the region from the west. At the surface, high pressure extending from Canada through the Midwest into the ArkLaTex to maintain light winds and mild conditions.
Overnight lows expected in the lower to mid 50s north of I-10, upper 50s to mid 60s south of I-10. Highs Monday and Tuesday remain in the lower 80s across the area with clouds returning by Tuesday as a weak frontal bndry settles into the Gulf Coast.
However, winds should be less as high pressure nudges further east. Temperatures will be similar on Monday to what they were today, with highs in the 50s east of the Missouri River, and around 60 F along and west of the Missouri River, as temperatures aloft remain below normal under the influence of the large upper-low/trough to the east.
(Today through Tuesday) Mid-level ridge continues to build over the state of Texas for the short term period. Today will consist of mostly clear skies with southeast winds gusting to 30 mph through the afternoon with highs reaching the low to mid 90s. Tonight will be partly cloudy as dewpoints continue to increase overnight and lows will be a bit warmer in the upper 60s.
The thermal troughing, which is setting up today, will hold through Tuesday night. Thus, look for those cooler than normal temps to continue.
1105 PM MDT Sun Apr 30 2023 Blocking pattern will support dry weather the next couple days along with seasonal temps, as the western NOAM ridge inches eastward. LL moisture will be shunted west against the front range of the Rockies by mid this week as the ridge begins to breakdown. This will support semi- active flow locally as a western CONUS trough ejects in pieces the second half of the week. Thus, showers and isold thunderstorms will return to the region along with cooler temps.
154 AM MDT Mon May 1 2023 An omega block over the CONUS will maintain ridging over the Northern Rockies through Tuesday, bringing warm and mainly dry conditions. With the ridge axis centered over the CWA, and an upper low along the West Coast, waves of moisture and weak energy will move northward on the west side of the axis.
1048 PM CDT Sun Apr 30 2023 (Tonight) Satellite imagery shows a low pressure system spinning over the Great Lakes this evening. As a result, dry conditions under clear skies will make for a relatively cool night with temperatures dropping into the lower 40s with a few spots in the higher terrain potentially dipping into the upper 30s.
High pressure will build over the short term across C AL. Otherwise, look for pleasant weather with 60s/70s for highs and the cooler 40s readings for lows making it a little further S tonight than this morning.
(Today through Tuesday afternoon) This evenings cold front continues to press south, but is running out of steam given the difuse pressure gradient pattern in place across W TX. Upper level pattern out west will transition from ridging to a deep cut off upper low along the Pacific coast which will play more of a role in our weather for Tuesday through mid-week. Scattered showers/storms will initiate over the high terrain of the Davis Mtns, as well off the eastern Sacs and high plains in SE NM. Highs on Tuesday will be a few degrees warmer compared to today, much closer to seasonal norms with temps in the 80s.
An upper-level trough situated to the north and centered over the Great Lakes Region continues to influence weather conditions across the FL peninsula. That should largely continue for today with mostly sunny skies and highs in the low-to-mid 80s. As the low continues to slowly lift away and ridging builds in from the Gulf, the FL peninsula begins to make the transition from more of a continental airmass back to a more tropical one - at least at the surface. While no dramatic wind shift is expected for the next couple days, a longer fetch of westerly flow over the Gulf brings more moisture back and warmer temperatures.
1131 PM MDT Sun Apr 30 2023 Upstream high pressure ridge still in control of Colorado weather under a relatively dry northwest flow aloft. There is just enough moisture and marginal instability for a few evening light rain showers or sprinkles across the higher terrain of Northern Larimer county early this evening. A few cumulus clouds have developed over the higher terrain this afternoon but there is very little vertical development. The axis of a upper level ridge over the western US will slide eastward closer to Colorado on Monday.
(Today and tonight) The tri-state region is under the influence of a large upper-level troughing pattern that will continue to hold. High temperatures for today will range from the upper 70s north of I-10 to the low 80s south of I-10. Lows tonight will be in the low 50s north of I-10, mid 50s to the south, and upper 50s along the coast.
While the westerly flow will prevent cool air advection across the region in the wake of the frontal boundary, the decreased water content in the low level boundary layer and clear skies will allow for radiational cooling to take place this morning. Wake up temperatures will be slightly below normal with lows in the upper 60s along both coasts and temperatures in the low to mid 60s across inland locations away from the influence of the latent heat sink that is the oceanic waters. With the large mid-level trough over the Great Lakes very gradually lifting to the northeast, 500 mb flow will remain out of the west to west-north west through the mid-week period as a mid-level ridge gradually builds across the Gulf of Mexico.
300 AM CDT Mon May 1 2023 An omega blocking pattern, with a little droop to the left is setup over much of the contiguous US this morning. The eastern trough axis is over the eastern Great Lakes region with the western one moving onto the northern California coast. The ridge axis in the middle runs up the spine of the Rocky Mountains. As is often the case in blocking patterns what you saw yesterday will be similar to what we get today.
An upper low will slide southward through early Tuesday with continued clouds and a few showers at times for the area.
Today into Tonight Upper level closed low over the Upper Great Lakes Region will continue to be the main weather feature to impact the forecast area today. the closed upper level low will slowly push east and allow for the eastern forecast area to be on the western periphery of the stratiform rain. With the closed upper level low slightly weakening and slowly moving east of the area. High temperatures are expected to be in the lower 40s to lower 50s.
325 AM CDT Mon May 1 2023 KEY MESSAGES: - Warmer and drier for the week ahead.
00Z synoptic & GOES-E water vapor analysis indicates deep upper trough centered over the Great Lakes. An omega block pattern has set up out to the west, leading to persistent northwest flow & high pressure building in. This will lead to highs below normal in the low 70s along & north of Interstate 20 to upper 70s to the south. Persistent dryness & high pressure ridging will keep a dry & cool night in store.
210 AM EDT Mon May 01 2023 High pressure will bring drier, gusty, and much cooler conditions through mid-week. The cold front extended from near Sanford to Raleigh, Louisburg, and Warrenton moving quickly SE at 930 PM. Multiple low pressure centers will be around the Great Lakes Monday morning, and these low pressure centers will move little over the next 48 hours. Tonight's cold front will bring a return to cooler weather, with highs in the 60s and lows in the 40s both days.
This upper level low will continue to drive our weather in the short term.
312 AM PDT Mon May 1 2023 A much cooler weather system will drop into the west coast and stall over the California central coast this week. The cooler temps will also slow the snowmelt leading to a slight reduction in flows on creeks, stream, and rivers. A much cooler early spring-like low pressure system will continue southward before settling over the central California coast. This system will be the focal point for a broader area of low pressure that will deepen across the western US through the week. The main upper low center will rotate energy and moisture over the region through mid-week with periods of mountain snow and valley rain showers.
An omega blocking pattern, with a little droop to the left is setup over much of the contiguous US this morning. The eastern trough axis is over the eastern Great Lakes region with the western one moving onto the northern California coast. The ridge axis in the middle runs up the spine of the Rocky Mountains. As is often the case in blocking patterns what you saw yesterday will be similar to what we get today.
630 AM CDT Mon May 1 2023 Key Messages: * Freezing temperatures this morning and again Tuesday morning.
The higher elevations will see some late-season accumulating snow. Satellite imagery shows the trough centered offshore continuing to drop south off the coast.
620 AM CDT Mon May 1 2023 (Today through Tuesday Night) Today, an upper level ridge over the Rockies/Great Basin will find itself caught between two troughs (centered over the West coast and Northeast CONUS respectively).
634 AM CDT Mon May 1 2023 (Today through Tuesday) Upper air analysis this morning shows northwesterly flow over Texas between a trough over the eastern half of the country and a ridge over the west. The low level flow will be from the south to southeast bringing moist air back to the region.
A general troughing pattern will bring cloudy skies and wet weather to the area. An upper level low pressure system oriented along Pacific coast has elongated but is expected to become cut off from the larger wave pattern. as an additional upper low strengthens over the north east along with a massive ridge heating up the mid west and great plains. This warming of the interior will set up local neighboring areas for thunderstorm activity as the colder airmass from the low, over runs warmer areas. Otherwise, persistent blocking patterns will continue through the week, ushering in the next upper level low pressure system towards the end of the week. Cluster analysis suggest that general troughiness will linger over the Western U.
Cooler today as a passing weather system brings another round of gusty winds.
622 AM CDT Mon May 1 2023 (Today through Tuesday afternoon) This evenings cold front continues to press south, but is running out of steam given the difuse pressure gradient pattern in place across W TX. Upper level pattern out west will transition from ridging to a deep cut off upper low along the Pacific coast which will play more of a role in our weather for Tuesday through mid-week. Scattered showers/storms will initiate over the high terrain of the Davis Mtns, as well off the eastern Sacs and high plains in SE NM. Highs on Tuesday will be a few degrees warmer compared to today, much closer to seasonal norms with temps in the 80s.
305 AM MDT Mon May 1 2023 The upper level ridge axis will shift a little further eastward into western Colorado today. Most of the plains should be able to reach the lower to mid 70s, with 60s foothills and high valleys, and 50s mountains. The plains appear to stable once again to support any convection moving out of the higher terrain. Early in the period, Colorado will be under an upper ridge over the western states, between an upper low centered over the Great Lakes and another centered just off the coast of California. Together these features form an omega blocking pattern over North America.
Surface ridging will strengthen across our CWA from the northwest while our CWA remains on the southwest periphery of a large closed low spinning over the northeast CONUS. This closed low was the eastern low of an omega block across the CONUS. Together these features will help keep temperatures cooler than normal today. 00Z synoptic & GOES-E water vapor analysis indicates deep upper trough centered over the Great Lakes. An omega block pattern has set up out to the west, leading to persistent northwest flow & high pressure building in. This will lead to highs below normal in the low 70s along & north of Interstate 20 to upper 70s to the south. Persistent dryness & high pressure ridging will keep a dry & cool night in store.