Aikyam-Lab/Synoptic-Bench huggingface dataset:
941 AM CST Mon Nov 20 2023 The cold front and attendant rain showers are oriented in a northeast-southwest line, stretching from Wells County back through the Bismarck area. West winds are starting to increase in velocity out west, as the cold front starts to move in. Aloft the low pressure system sits in the Central Plains, with plenty of synoptic lift in the eastern Dakotas and Minnesota. The rain will also move off to the east with the trough, ending by this afternoon. The west will be in the mid 40s and the east in the lower 50s. Lows tonight will be cooler in the 20s. Aloft a big ridge over the Western CONUS moves in.
Showers will gradually wind down tonight with building high pressure ushering in a drier pattern for Monday and early Tuesday.
249 PM EST Mon Nov 20 2023 A low pressure area will bring rain to the area later tonight into Tuesday. A low pressure area was south of Kansas City early this afternoon. Have moved back the onset of the rain given the dry conditions in the lower atmosphere.
The large scale WMC-SFO pressure gradient holds strong overnight into Tuesday, however the eastern Pacific sharp 500 mb ridge will begin to weaken later this evening through Tuesday. Daytime highs will warm up to the 60s most locations, including the lower to mid 70s from the San Francisco Bay Shoreline to the southern Monterey and San Benito Counties.
A ridge of high pressure is building over western Montana and north central Idaho and will remain in place through Tuesday. Stable conditions with poor atmospheric mixing may allow air quality to degrade slightly, but given the shortlived nature of this ridge, air quality advisories are still not anticipated.
* Slightly cooler temperatures and windy Tuesday. A broad upper level trough currently over the central part of the country will push eastward and begin to work its way out of the area tonight. Will see a decent pressure gradient develop behind the exiting low pressure system overnight and into Tuesday morning, with wind gusts up to 35 mph possible.
Still though, advisory level gusts are possible with highest gusts along the higher elevations of the Plateau. A band of showers and storms along the surface cold front will bring to an end the showers and storms Tuesday morning from west to east.
314 PM CST Mon Nov 20 2023 (Issued 313 PM CST Mon Nov 20 2023) Tonight through Tuesday night: Dry conditions continue into this evening, with increasing shower chances through the overnight hours as low pressure approaches and slides just to our south. Steady rain will likely occur across far southern and southeastern Wisconsin late tonight through Tuesday morning in the deformation band area of the low. Gusty easterly winds through the rest of tonight will shift to northerly Tuesday morning as the low pressure propagates into Lower Michigan. Winds will slowly diminish overnight as the low exits.
532 PM CST Mon Nov 20 2023 (This evening through Tuesday) The cold front is working its way southward across west central Texas this afternoon.
655 PM CST Mon Nov 20 2023 Bands of light rain ahead of the cold front continue to move east this evening, with rain rates under 0. Temperatures remain well above freezing (colder temps still well north in Canada), so it should continue to remain rain this evening. Key Messages: 1)Cold front this afternoon, with dropping temperatures into Tuesday. The cold front is slowly making its way towards us, expecting the wind shift to occur in the evening hours around 9 PM. As the cold front passes through, winds will increase from the NW, and stay higher into Tuesday morning, with gusts up to 35 MPH possible in the Devils Lake Basin.
528 PM CST Mon Nov 20 2023 Low pressure currently over Oklahoma will lift northeastward over the next 24 hours. As the low lifts northeastward into the Wabash River Valley by Tuesday morning, the steady rain will diminish to scattered showers along/east of I-57.
544 PM CST Mon Nov 20 2023 Key Messages: 1)Cold front this afternoon, with dropping temperatures into Tuesday. The cold front is slowly making its way towards us, expecting the wind shift to occur in the evening hours around 9 PM. As the cold front passes through, winds will increase from the NW, and stay higher into Tuesday morning, with gusts up to 35 MPH possible in the Devils Lake Basin.
A strong area of low pressure will bring a potential for a few strong to severe thunderstorms to portions of the Mid-South this evening.
Ridging is set up along both the east and west coasts with an upper level low across the central plains. The low will continue moving east as high pressure continues to build into the desert southwest.
557 PM CST Mon Nov 20 2023 A strong area of low pressure will bring a potential for a few strong to severe thunderstorms to portions of the Mid-South this evening.
117 PM PST Mon Nov 20 2023 Mild and dry weather will prevail through the midweek before a cold front arrives to the region Thanksgiving morning. A few light showers near the Oregon border, cooler temperatures, and increased breezes will accompany the frontal passage. You can't ask for much better weather during one of, if not the most, busy travel periods of the year as the days leading up to Thanksgiving will be dry and mild, courtesy of amplified ridging aloft.
-----BMickelson Previous Discussion: Upper flow is NW over northeast Montana this afternoon as an upper ridge is building in from the Pacific NW.
Low clouds over the higher terrain along the Southern Rim/White Mountains are quickly dissipating this evening as winds gradually slack. The low pressure system that delivered showery and locally severe weather the past few days was heading eastward. A trailing cold front was producing a few lingering showers over far eastern Arizona which will come to an end this evening. For the remainder of the period through Thanksgiving Day dry conditions are in store as high pressure builds in from the west.
432 PM EST Mon Nov 20 2023 High pressure will build across the region tonight into Tuesday.
758 PM EST Mon Nov 20 2023 Regional radar imagery shows scattered showers off the Atlantic coast associated with a coastal trough but not expecting any precipitation activity from this feature to move into our area this evening so dry conditions should prevail across west central and southwest FL. The increase in clouds and a slight uptick in wind speeds should keep fog chances on the low side compared to recent nights but don't want to completely rule it out for mainly interior areas where some small possibility exists. In general, sunny skies with a few clouds, with highs in the lower to mid 80.
(Tonight through Tuesday night) A cold front will continue to make its way across South Texas this evening leading to much cooler and breezier conditions by early Tuesday morning. Lows on Tuesday night will be even cooler, and ranging from the low 40s inland to the low 50s along the coast.
Northwest to north flow will maintain cooler than normal temperatures into Tuesday. The southern/western end of a positively tilted trough axis from the southern Plains into Arizona is currently working through the region with the flow becoming more northerly today.
627 PM EST Mon Nov 20 2023 (Rest of today through Tuesday) Generally benign and quiescent weather is expected to prevail in the presence of stout upper ridging aloft. Broad surface ridging will develop along the eastern US/western Atlantic waters, and gradually build through the week. Warm temperatures can be expected today, with highs in the lower 80s across most of South Florida. Mild overnight low temperatures will be in the 60s across the interior, with warmer values in the lower 70s across the east coast.
626 PM EST Mon Nov 20 2023 A low pressure area will bring rain to the area later tonight into Tuesday. A low pressure area was south of Kansas City early this afternoon. Have moved back the onset of the rain given the dry conditions in the lower atmosphere.
The cold front is across the western side of the CWA with dewpoints falling into the upper 50s to lower 60s behind it and light NNW winds.
(Today and tonight) One final short wave trough was currently moving overhead which was able to drop some very light rain showers early this morning. More substantial drying of the atmospheric column will spread over the region today after this trough passes. A tight height gradient will continue to exist overhead this morning before the parent upper level low pulls away farther to the east. Surface ridging will then move into the area lessening winds and leading to a cool night.
335 AM EST Tue Nov 21 2023 Overrunning moisture against a ridge of high pressure will increase widespread rain chances today as a large low pressure system pushes northeastward and an associated cold front moves across the area later today into tonight. High pressure, along with dry weather is on tap for Thanksgiving. We start out this morning with increased isentropic upglide and overrunning low level moisture against a strong classical CAD wedge as a broad low pressure system approaches from the west. Carrying mainly categorical to definite pops through much of today and the heaviest rainfall should be during the daytime hours ahead and along the associated cold front. Storm total amounts look to generally range from 1-2 inches with locally higher of 3+ up against the Blue Ridge. Rain comes to an end as a cold front crosses the area.
1017 PM CST Mon Nov 20 2023 (Tonight through Tuesday night) A cold front will continue to make its way across South Texas this evening leading to much cooler and breezier conditions by early Tuesday morning. Lows on Tuesday night will be even cooler, and ranging from the low 40s inland to the low 50s along the coast.
Currently - An expansive high pressure system paints the Atlantic coast and is driving freshening easterly breezes. Ridging dominates through the lower and mid troposphere with nearly zonal flow aloft.
The ridge will continue to build over the region through the middle of the week, with light easterly- southeasterly winds and normal temperatures expected on Monday and Tuesday.
242 AM EST Tue Nov 21 2023 It will be slightly warmer today compared to the past few days, with highs in the upper 40s to low 50s.
(Today and tonight) Gusty northerly winds will continue today as cooler air moves into the region behind the front that moved across the area Monday.
Warming trend up to Thanksgiving, then cooler once again into the weekend. Drizzle and fog early this morning: In the wake of a cold front, reduced visibilities due to intermittent drizzle and fog are currently ongoing across the CWA. The higher end of the wind range will occur towards the MO/KS border where terrain is flatter. Given the cooler and less moisture-laden air behind the front, current thinking is that these will just be sprinkles with isolated areas of light rain (10-15% chance). Despite being under northwesterly flow, a pronounced mid and upper-level ridge over the western CONUS will transport warmer air eastward.
With a ridge to the west and a trough to the east, dry and chilly northerly flow is in place over eastern Utah and western Colorado. Over the course to today, the axis of the ridge to our west will shift from a northerly to more northeasterly orientation in response to the next Pacific system moving into the Pacific Northwest. This will result in flow aloft shifting to zonal by tomorrow morning and allow some slightly warmer air to move in aloft.
* Colder temperatures to move in soon after this low pressure system moves off to our east-northeast. However, sprinkles cannot be ruled out through the daytime today since we remain in cyclonic flow as the low center passes off to our east/northeast.
The remainder of the week will be mostly sunny and mild, then a weather system will bring cooler temperatures over the weekend and maybe a shower or two. East to northeast winds are picking up the last couple of hours over the higher terrain and it is a matter of time before they mix to the surface. Temperatures from Tucson westward will peak 2-6 degrees warmer than yesterday while to the east highs will be similar or a couple of degrees cooler.
1231 AM EST Tue Nov 21 2023 (Rest of today through Tuesday) Generally benign and quiescent weather is expected to prevail in the presence of stout upper ridging aloft. Broad surface ridging will develop along the eastern US/western Atlantic waters, and gradually build through the week. Warm temperatures can be expected today, with highs in the lower 80s across most of South Florida. Mild overnight low temperatures will be in the 60s across the interior, with warmer values in the lower 70s across the east coast.
1242 AM EST Tue Nov 21 2023 A low pressure area will bring rain to the area later tonight into Tuesday. A low pressure area was south of Kansas City early this afternoon. Have moved back the onset of the rain given the dry conditions in the lower atmosphere. Looking at MVFR conditions for both terminals beginning after 10z Tue with lowered cigs and expecting the low levels to moisten us with additional rainfall to bring vsbys down to 4 to 5 SM.
1000 PM CST Mon Nov 20 2023 Light rain continues ahead of the cold front, with the timing/coverage lining up with the last update issuance. Bands of light rain ahead of the cold front continue to move east this evening, with rain rates under 0. Temperatures remain well above freezing (colder temps still well north in Canada), so it should continue to remain rain this evening. Key Messages: 1)Cold front this afternoon, with dropping temperatures into Tuesday. The cold front is slowly making its way towards us, expecting the wind shift to occur in the evening hours around 9 PM. As the cold front passes through, winds will increase from the NW, and stay higher into Tuesday morning, with gusts up to 35 MPH possible in the Devils Lake Basin.
1102 PM CST Mon Nov 20 2023 (This evening through Tuesday) The cold front is working its way southward across west central Texas this afternoon.
Low pressure will move northeast across southeast IL overnight and into northern IN Tuesday morning. Eventually, as the low approaches rain will become steady and prevailing for several hours and will continue into the Tuesday morning commute. Easterly winds will continue to gust into the 30 mph range this afternoon and early this evening and then begin to diminish through the night, turning more northerly as the low approaches. Lows tonight will only fall into the 40 degree range for most areas, perhaps upper 30s across northwest IL and then not much rise expected in highs on Tuesday, generally in the lower/mid 40s.
Overnight lows will range from the low to mid 60s near the Lake to the lower 70s along the immediate east coast.
Closer to home over the Plains, high pressure is dropping southeast over the Front Range, advecting drier air southeastward. These winds will make a chilly day with highs in the 40s feel even colder, before they weaken overnight as high pressure approaches. A bit of a warmup follows for Wednesday as winds turn southwesterly ahead of the next cold front, boosting highs into the 50s. The next upper trough digs into the central Rockies by the end of the week.
648 AM EST Tue Nov 21 2023 It will be slightly warmer today compared to the past few days, with highs in the upper 40s to low 50s.
327 AM CST Tue Nov 21 2023 (Issued 320 AM CST Tue Nov 21 2023) Today through Wednesday: The low pressure system will continue to eject northeastward, crossing southern Michigan this afternoon. Precipitation is currently falling as light to moderate rain across most of the CWA, but with N to NE winds advecting cool dry air into the the fringes of the low pressure system's precip shield, wet bulb temperatures are forecast to decrease over the next few hours, allowing some snow to mix in with the rain. Tonight's low temps range from 24 to 30 degrees for inland locations, but lakeshore counties may remain at or slightly above freezing. Dry weather and decreasing cloud cover expected Wednesday, with highs in the low to mid 40s.
- Slight warm-up Wednesday before a shift to cooler, but near average conditions. - Slight warm-up Wednesday before a shift to cooler, but near average conditions. Bands of scattered light rain showers that are part of a passing cold front are continuing to make their way across Minnesota and western Wisconsin before dissipating a few hours after daybreak today. Wednesday's highs are forecasted to be 10-15 degrees warmer than they are today thanks to this southwesterly flow. Flow becomes more zonal for the weekend with little improvement from cooler temperatures.
Otherwise, breezy conditions have kept temperatures in the upper 70s with dew points in the lower 70s.
(Today through Wednesday Night) A sharp drop in temperatures along with the development of gusty north winds has accompanied the departure of yesterday's cold front, with most locations now reporting wind gusts of around 20 mph (25-30mph along the coast).
-Slightly warmer Wednesday through midday, then reinforcing cold air surges into the area Wednesday afternoon and evening. Areas where cloud cover increases faster will see warmer lows, with the opposite being true for areas where cloud cover is slower to set in.
Up in Central Canada, a strong cold front is brewing for Wednesday. Today, however, we will see sunny skies with the high pressure influence.
107 AM PST Tue Nov 21 2023 Dry and warmer weather expected through the week.
529 AM CST Tue Nov 21 2023 (Today through Wednesday) At 500mb, a low will be pinched-off from its parent trough which will depart to the east through the short term. However, this will not have an impact on south-central Texas weather as the low will sit over Mexico and very dry air will be present above 700mb locally. At the surface, expect strong north/northwesterly flow to continue through the day today as high pressure continues to build into the region, bringing with it cooler and drier air. Wednesday morning lows are currently forecast to range from the mid 30s to the lower 40s, with the coldest temperatures across the Hill County.
Positively tilted longwave trough over the U. The FL Peninsula will remain in the warm sector of the system today as winds veer southerly ahead of the cold front that is expected to move through tomorrow.
Clouds wl begin to dcrs fm the west tngt as the main upper lvl trof axis swings off to the east. NW AR wl see sub-freezing low temps tngt.
321 AM CST Tue Nov 21 2023 Key Messages: - Winds decreasing into the early afternoon - Slightly cooler today, warmer Wednesday As of 2AM, its a bit windy out there, gusting up to around 30 mph, a bit higher over the Coteau. We will be on the downwind side of a ridge through the end of the period. This will result in cooler temperatures today. However, with the ridge and some WAA Wednesday, temperatures at 850mb will rebound to around 10 to 12 degrees C.
(Today through Wednesday) The most recent Weather Prediction Center surface analysis indicates a cold front over the western Gulf of Mexico and completely through the BRO CWFA. Precipitation-wise, an influx of dry air behind the cold front, combined with an initially-zonal mid-level flow that will become more out of the southwest over time, will result in dry weather across Deep South Texas and the Rio Grande today and tonight. As closed 500 mb low pressure develops over western Mexico, some precipitation, isolated in nature, may develop over the lower Texas coastal waters on Wednesday, while the inland areas remain dry owing to precipitable water values there struggling to increase.
Most of the area will remain dry though with partly cloudy skies and afternoon high temps generally in the low to mid 80s. Overnight lows will range from the low to mid 60s near the Lake to the lower 70s along the immediate east coast.
Early This Morning Mid-level WV showed a compact cyclonic circulation over west- central Illinois, which was embedded within larger scale troughing over the Mid to Upper Mississippi Valley. WV and radar loops showed moisture wrapping around the low to the NW into a deformation zone draped across eastern Iowa into NW Illinois. However, with air and ground temperatures above freezing do not anticipate any impacts if the precip mixes with or briefly changes to snow -- roadways will remain wet. Rest of Today into Tonight A tight pressure gradient will set up over the region between high pressure building into the Plains and low pressure over the Great Lakes.
519 AM CST Tue Nov 21 2023 (Today through Wednesday) The most recent Weather Prediction Center surface analysis indicates a cold front over the western Gulf of Mexico and completely through the BRO CWFA. Precipitation-wise, an influx of dry air behind the cold front, combined with an initially-zonal mid-level flow that will become more out of the southwest over time, will result in dry weather across Deep South Texas and the Rio Grande today and tonight. As closed 500 mb low pressure develops over western Mexico, some precipitation, isolated in nature, may develop over the lower Texas coastal waters on Wednesday, while the inland areas remain dry owing to precipitable water values there struggling to increase.
521 AM CST Tue Nov 21 2023 Update for 12Z TAFs Key Messages: - Winds decreasing into the early afternoon - Slightly cooler today, warmer Wednesday As of 2AM, its a bit windy out there, gusting up to around 30 mph, a bit higher over the Coteau. We will be on the downwind side of a ridge through the end of the period. This will result in cooler temperatures today. However, with the ridge and some WAA Wednesday, temperatures at 850mb will rebound to around 10 to 12 degrees C.
The Canadian wave phases with a wave in the eastern Pacific forming an elongated trof across the northern Rockies into northern California on Wednesday night.
A cold front will then bring a slight chance of showers and increased breezes for Thanksgiving Day. It will remain on the cooler side through the remainder of the holiday weekend. The only notable weather feature will be a fast moving cold front that will makes its way through northern NV on Thanksgiving Day. Temperatures will warm several degrees each day although stubborn inversions in some of the lower western NV valleys may limit the warmup there. High temperatures in some of the higher Sierra valleys may actually be near or even above those of the lower valleys! * For Thanksgiving Day into the weekend, a trough dropping southward into the Intermountain West will bring a big cooldown as north-northeast flow returns to the Great Basin.
Dry conditions, warmer temperatures, and lighter winds are expected for today and Wednesday. As a trough moves out of the region, cold and blustery conditions remain overnight. Heights begin to rise as the trough departs and high pressure builds over the Pacific.
(Today through Wednesday) The prefrontal trough is currently passing and is located from about Picayune to Houma. The actual cold front is lagging but is found from Jackson MS to Lafayette. Temps will fall back several degrees today but CAA will continue through today and tonight causing temps to struggle to reach the lower 60s Wed.
517 AM CST Tue Nov 21 2023 (Today and tonight) One final short wave trough was currently moving overhead which was able to drop some very light rain showers early this morning. More substantial drying of the atmospheric column will spread over the region today after this trough passes. A tight height gradient will continue to exist overhead this morning before the parent upper level low pulls away farther to the east. Surface ridging will then move into the area lessening winds and leading to a cool night.
(Today and tonight) A cold front will drop temperatures significantly across the region this afternoon. Lows will be right around the freezing mark for many locations.