Aikyam-Lab/Synoptic-Bench huggingface dataset:
Issued by National Weather Service Tucson AZ 650 PM MST WED SEP 21 2016 Showers and a few thunderstorms will be possible Thursday along and ahead of a cold front moving through the region. This front will bring gusty winds, drier air, and slightly cooler temperatures for the remainder of the week. /157 PM MST WED SEP 21 2016/ On Thursday, trough/closed low will push through the Great Basin and drag a cold front across Arizona. Behind the front, much drier air is expected with BL mixing ratios falling from 10-12 g/kg to 1-2 g/kg yielding surface dew point values in the low 20s and possibly lower.
840 PM EDT Wed Sep 21 2016 High pressure will be centered over the region tonight and move off the coast Thursday.
A fairly dry airmass still is covering the cwa with dewpoints mainly in the lower 60s, thus not expecting any widespread/dense fog overnight. (Issued 609 PM CDT Wed Sep 21 2016) For 00Z TAFs: Upper ridging will keep mainly vfr conditions thru the fcst period.
922 PM MDT Wed Sep 21 2016 A vigorous upper level low with elongated center along the Pacific NW coast this evening will dig slowly southeast into Northern CA/NV overnight.
/issued 839 PM CDT WED SEP 21 2016/ The subtropical ridge continues to dominate the weather pattern over the Mid-South this evening.
With flow becoming more onshore and the presence of a coastal trough progged in all the guidance, there's at least some potential for some showers to pop up near the coast. /ISSUED 407 PM CDT Wed Sep 21 2016/ Upper ridging holding on tight today, suppressing afternoon convection, although a stray shower or two over the southeastern forecast area cannot be ruled out over the next couple of hours.
Satellite derived water vapor imagery still indicates that a dry slot will move into the area after midnight and shower activity is expected to diminish until moisture wraps back around the northwest side of the upper low into the area again tomorrow afternoon.
839 PM CDT WED SEP 21 2016 The subtropical ridge continues to dominate the weather pattern over the Mid-South this evening.
Mostly clear skies and slightly below temps Tue & most of Wed will give way to increasing cloudiness and warmer conditions during the second half of the week as high pressure moves off to the east. Slight chances of shra could be a possibility during this time period, but with the upper ridge still positioned to the west we'll have to overcome some subsidence aloft. 47 Sea over the offshore waters remain a bit elevated this morning, but expecting them to decrease shortly as high pressure continues build- ing into the area. We could see a slight bump up in winds by tonight as a reinforcing cold front moves into the coastal waters. likely not clearing until a secondary (reinforcing) cold front moves across the area later this afternoon.
At the synoptic scale, upper level ridging will begin to impact the Treasure state during the day on Monday. The first involves the potential for some light freezing rain across the central and eastern zones. HRRR sounding data at both Billings this morning and Miles City this afternoon show a elevated layer of warmer air above the surface. Temps across the eastern portion of the CWA will likely remain below freezing today, with even colder temperatures still trapped in various valleys and such. Second, as the ridge moves in, it sets up the potential for a pretty gusty afternoon in the Livingston and Nye areas.
606 AM EDT Mon Mar 13 2017 Periods of snow will accumulate between 1 and 4 inches across the region today into tonight as low pressure tracks southeast through the Ohio Valley. Highs today will only recover into the upper 20s and low 30s, with lows tonight falling back into the low to mid 20s.
1029 PM PDT Sun Mar 12 2017 More widespread rain and warmer temperatures are in the forecast for Monday. Evening update: a large area of middle to high clouds continue to spill over the ridge in advance of the next wave of steadier precipitation. Cote' 06Z TAFS: A weak waves overtops a ridge of high pressure, bringing some middle to high cloud tonight and maybe a few showers over northeastern WA/north ID.
A cloudy and cool night is in store for South Central Texas in the wake of a cold front. Surface winds will shift to the southeast and south this evening into Monday as a high pressure ridge moves to the northeast. Cloudy skies remain for most of the day on Monday with highs in the upper 60s across the Hill Country to the lower 70s along the I-35 corridor and upper 70s along the Rio Grande Plains. A dry cold front is forecast to move across the area late Monday afternoon/early evening. A cooler airmass will push into the area Monday night to bring lows into the mid 40s across the Hill Country and upper 40s to mid 50s elsewhere.
445 AM EDT Mon Mar 13 2017 The latest surface map features high pressure centered across southern Manitoba, with broad ridging arcing across the Great Lakes and then into the Mid-Atlantic. Low pressure is moving into the Midwest. Aloft, a deepening trough is moving across the central CONUS, with zonal flow to the east, and ridging out west.
Blended guidance is not handling temperatures well, and trended toward cooler model guidance for temperatures this morning and this afternoon. High pressure continues to drop southeast out of Canada, although it is expected to glance our eastern CWA before return flow sets up across western South Dakota later this afternoon and tonight.
These conditions will likely prevail through the next few hours, with brief improvements in visibilities and ceilings possible, until the passage of a mid-level trough a few hours prior to sunrise Monday morning. VFR is expected to return in the wake of the trough tomorrow with clearing skies and veering winds. /issued 245 PM CDT Sun Mar 12 2017/ SHORT TERM (Tonight through Monday Night): The weak cold front moved south of the Rio Grande by the mid to late morning, with only some sprinkles of rain to mark its passage. Cooler and somewhat drier air is filtering into the region on breezy NNE winds. For tonight, broad high pressure will settle across Eastern Texas with winds lessening but remaining northerly. For Monday, clouds will erode through the day, especially as a stronger high pressure system slowly moves south through the Plains states.
Therefore, lowered the high temperatures several degrees.
44 kts ODX 38 GRI/JYR/EAR 37 HSI Today was windier and cooler than originally anticipated yesterday, clouds stuck and are thicker. The cold front is currently located just northwest of the forecast area.
Warm and dry conditions will dominate the week ahead as high pressure lingers over the Southwest.
Strong high pressure will bring well above normal temperatures through the rest of the week.
when upper trough exits to the southeast and somewhat drier air works in. We could see some sunshine develop to the northwest during the afternoon as high pressure builds southeast.
Shra and low end MVFR CIGS expected mainly along the northern Gulf coast as this low passes into today. Clouds and cold air advection have kept temps well below normal today with most areas in the low to mid 50s. As the low moves east tonight, rain will begin to spread northward late tonight into Monday morning. The rain will begin to move east of the area late in the afternoon as the cold front moves through. Highs on Monday will warm back into the low to mid 60s inland to mid and upper 60s near the coast. Lows tonight will range from the low 40s inland to low 50s along the coast.
low pressure was centered over w-cntrl IA with a trailing cold front extending from sern Neb to sern WY.
some moderate at times especially near the Highway 63 corridor. For the most part, main roadways should be just wet but can't rule out a slick spot or two on bridges and rural roads if enough slushy snow accumulates. Temperatures are going to hover near or just above freezing during this wet snow event.
A strong cold front blasted across the CWA this afternoon, and has already pushed into central Nebraska per observed surface wind and MSAS pressure tendencies.
644 AM EDT Mon Mar 13 2017 High pressure centered over the area this morning will move off the east coast by this afternoon.
High pressure will prevail across the southwest U.
313 AM CDT Mon Mar 13 2017 Clipper type Low pressure system will drop southeast into the middle Mississippi Valley early today. Still a bit uncertain as to whether the precip will cause evaporative cooling of the column enough to produce near freezing surface temps as it spread into the forecast area early today. Rain chances will then decrease from west to east this afternoon into tonight as the low moves off to our east. Another cold Canadian high pressure system will bring drier conditions for the remainder of the short term.
With the CWA on the north side of cold front that passed south earlier today. Northwest flow aloft is becoming more amplified over the Rockies as the upper trough moves east of the Rockies and across the northern and central High Plains. Temperatures will remain above freezing through that time, so any precipitation that does fall is expected to remain as rain. On Monday, cooler temperatures will remain over the eastern sections of the forecast area where highs will only reach the lower 40s. A lee trough will already be deepening along the front range of Colorado by mid day Monday, which will keep the warmer air in place over the west where highs will approach 60.
Temps are also running a bit warmer as clouds have helped to keep temps up a bit. A Canadian high centered over southern Canada will push a fast moving cold front currently located in Oklahoma into the coastal waters by this evening.
The snow is associated with an area of low pressure passing well off to the south of Michigan over the Ohio Valley.
234 AM CDT Mon Mar 13 2017 A cold front is moving into the Permian Basin this morning and will be through most areas by noon. Weak cold air advection behind the front will not be enough to offset the increase in insolation over what occurred yesterday so highs today will actually be slightly warmer than yesterday despite the frontal passage. An upper level ridge currently over the west coast of the U.
505 AM EDT Mon Mar 13 2017 High pressure centered over the area this morning will move off the east coast by this afternoon.
Rain will spread northwest to southeast across the state as a cold front approaches, with ceilings and visibilities decreasing. Expect clearing by late morning behind the cold front.
258 AM MST Mon Mar 13 2017 High pressure will dominate much of the western states this week.
Highs today will be similar to those observed yesterday along the front range, but inversions to the east and northeast of Denver will hold those locations a few degrees cooler. This will bring occasional gusty winds to the Front Range mountains and nearby adjacent plains, with higher ridges seeing gusts up to 50 mph.
Upper trough lagging behind sfc front and stg nw flow aloft this aftn setting up will continue throughout the week.
Warm and dry high pressure aloft will center over the Great Basin through midweek.
High pressure aloft will build over the Desert Southwest beginning tonight.
433 AM EDT Mon Mar 13 2017 Periods of snow will accumulate between 1 and 4 inches across the region today into tonight as low pressure tracks southeast through the Ohio Valley. Highs today will only recover into the upper 20s and low 30s, with lows tonight falling back into the low to mid 20s.
Most of the snow should be over the higher terrain of N-central Upper MI where the NE winds will most favor. Models suggest that the amplified pattern with a deep mid/upper level trough over the Great Lakes and ern CONUS will give way to a more progressive flow.
There will be a gradient of temps across the region today as a warm front lifts north through at least a portion of the area. Southern IN will top out in the lower 40s while east central KY will see highs around 50.
349 AM CDT Mon Mar 13 2017 Water vapor loop indicated an upper level trough located over the southern MAN/Ontario border. Trough will move southeast today. Upper level ridge axis was located over the west coast. Upper level ridge will shift into the Northern Plains and central Canada by 12Z Thu.
1229 AM CDT Mon Mar 13 2017 Cold front is progressing southward, now moving through the Amarillo area.
Regarding headlines for freezing temperatures due to early emergence of sensitive vegetation, will punt to the day shift to allow for more coordination with partners. Will continue to mention the well below freezing temperatures in the HWO briefing packet though. At the inflection of the deepening eastern trough and the building western ridge, a narrow corridor of light snow looks possible.
The pre-frontal trough had swept through Kansas earlier in the night with the cold front bisecting NE Kansas from Falls City to McPherson at 08Z and likewise pushing SE. CAA will persist through today and much of tonight, with H850 ridging building in central KS and allowing warmer air to begin working into the region. Wrap around precip behind the passing low may clip NE portions of the CWA this morning, with sounding profiles from the NAM/RAP/HRRR saturated only up to -6 to -9 C and surface temps lingering below freezing well through the morning. Given the possibility of no ice introduction, mentioned both a chance of snow and freezing rain as this feature passes through prior to 18Z. Did push back the timing of the snow onset from the previous forecast based on good spatial continuity in the high-res guidance.
354 AM CDT Mon Mar 13 2017 Currently, arctic high pressure was over southern Manitoba while the departing low pressure storm system that brought snow to our area on Sunday was over Iowa. The upper level ridge is forecast to build eastward into the Dakotas today and tonight. This lower level warm advection is forecast to continue today with decent H850 winds of 15-20 knots. This will keep a good moist southerly flow riding up and over the departing dome of arctic air in isentropic lift, expanding the lower level clouds eastward across all of western and central ND. A warm-up is in store this week as 500 mb flow across the lower 48 becomes characterized by mean ridging in the west and a deep and energetic trough in the eastern part of the country.
This low track is farther south than what was forecast 24 hours ago.
The RAP/NAM both show deeper moisture diminishing by 12Z and then the low level flow will become anticyclonic this afternoon.
334 AM CDT Mon Mar 13 2017 Another back door cold front is pushing west/southwest through our CWA overnight. Temps will climb into the low 60s across our area and should end up being a tad cooler than normal. A western CONUS ridge/eastern CONUS trough will generally be maintained through the week, although the pattern will shift eastward late in the week bringing the upper ridge over the Plains states. After this morning's cold front the next cold front is still expected to be of the backdoor variety.
Slight rise in 850 mbs temps and low to mid level thicknesses on Mon should again result in max temps in the low 80s over portions of the Valley.
An upper low embedded in a northern stream longwave trough is seen clearly on WV imagery this morning over the IA/NE line. The upper trough will amplify today, covering the entire eastern half of the country by tonight. In addition, the Eastern Seaboard down through the Tri-State region reside under a cool, stable wedge of high pressure. Thus, forecast rain amounts will likely be less than an inch; with the highest accumulations east of a line from Tifton through Panama City.
337 AM CDT Mon Mar 13 2017 A low pressure system is currently moving across the northwestern Gulf of Mexico this morning. A few showers are developing along the coast this morning, and expect more showers to develop today in response to the low and also a front pushing southward towards the area. Most of our activity will come from the low pressure to the south. The aforementioned cold front will push through the area tonight bringing with it much cooler temperatures especially in the overnight hours.
Forecast soundings across this area suggest a potential loss of ice crystals in the profile, which could cause the light snow to mix with or change to a period of freezing drizzle along/southwest of a Rushville to Taylorville line through 15z. Despite the low weakening and tracking into the Ohio River Valley, a few rain and snow showers will linger into the evening.
320 AM CDT Mon Mar 13 2017 Upper closed low over the Gulf of Alaska and a trough of low pressure from the Hudson Bay into the Missouri Valley with sharpening ridge between the two over the western CONUS. Light snow to develop tonight mainly over north central Nebraska to the east of Highway 83 on the nose of 150kt+ jet rounding the upper ridge today.
347 AM MDT Mon Mar 13 2017 A building ridge of high pressure to the west will bring a drying and warming trend which is expected to extend through midweek.
Deepening mid-continental upper trough deepens further through the day as it shifts into the eastern U.
400 AM EDT Mon Mar 13 2017 The latest surface map features high pressure centered across southern Manitoba, with broad ridging arcing across the Great Lakes and then into the Mid-Atlantic. Low pressure is moving into the Midwest. Aloft, a deepening trough is moving across the central CONUS, with zonal flow to the east, and ridging out west.
The cold front will push southward through the forecast area overnight into early Monday morning, with northerly winds of 15-25 mph and higher gusts expected into the daytime hours Monday, ushering in cold air advection.
Svrl Narrow/Minor Precip Bands will Skim Parts of the Fcst Area thru Wed with Much Warmer Temps Surging Back in Thu and Aloft: A compact but impressive vort max was along the NE/IA border at 07Z and dropping SE. A 125 kt jet streak will crest over the Wrn ridge today and strengthen to 135 kts as it dives over the Plns. The associated cold front that moved thru last eve was just S and E of the fcst area (FA). The front will cont moving S/E away from the FA while the high will nose S into the rgn but remaining over Canada. These flurries should end prior to dawn as the low pulls away. but with the cold thermal trof overhead. 06" E of a line from EAR-HSI-HJH with the highest amts from ODX-OLU.
Forecast area under fast northwest flow aloft in between upper high over southern California and low pressure over the Great Lakes.
The low level streamline trajectories are now becoming more orientated to the northeast, edging down from dry high pressure in south central Canada. In fact the low to mid level baroclinic zone is quite sharp west of I 29 denoting a warm front aloft.
High pressure will build south across the area tonight, but increasing mid clouds and low level east/northeast winds may result in a more narrow diurnal range and trended low temperatures up slightly from the previous forecast. As we move into the middle of the week, southeast winds will return as high pressure builds over the Ohio Valley.
A ridge of high pressure will continue to dominate the weather pattern across the region and result in dry weather conditions along with above average temperatures.
Continued cold air advection in wake of the morning cold front and persistent cloud cover has kept temperatures much cooler today. This will allow for another surge of high pressure to slide into the region Monday evening and night as another mid level trough axis passes aloft. Tonight will be cool and cloudy, with lows in the low to mid 50s. Tomorrow night temperatures will cool back down into the low to mid 50s most inland locations under partly cloudy skies.
this airmass spills west onto the high Plains of Montana where it bumps up against a developing ridge over the western third of the CONUS and Canada. the ridge behind the system is expected to be pressing which will move frontal boundary along behind the system.
405 AM MDT Mon Mar 13 2017 Dry northwest flow aloft behind yesterday's system will result in cooler temperatures today, especially for the southeast plains where maxTs will top out in the lower 60s vs yesterday's lower 70 readings. Meanwhile, mountain areas will remain breezy to windy through the day, particularly over the exposed ridges and peaks where gusts up to 50 mph will be possible in the afternoon. Surface lee trof redevelops tonight which should result in warmer overnight lows along the lower eastern slopes/I-25 corridor where westerly winds develop.
Temperatures have fallen into the upper 20s for many east of I-65 with most places west of I-65 at or above freezing.
The precipitation moving into the Midsouth is the product of a clipper type trough quickly approaching the Mississippi River valley. By sunset the trough axis should be centered over middle Tennessee and Alabama resulting in dry conditions across the Midsouth.
447 AM EDT Mon Mar 13 2017 Currently - Broad inverted troughing centered over Florida is producing light east to southeast breezes across the Keys and surrounding waters. Temperatures are mostly in the low to mid 70s with a few locations radiating to near or slightly below 70. However, a complicated trough aloft is amplifying as it crosses the Rockies and pressures are falling in the western Gulf of Mexico. Forecast - Over the next couple of days the previously mentioned trough aloft will continue to amplify as it swings into the eastern United States. The low will continue to move out to the northeast over the following couple of days and a high pressure system will drive southwards into the eastern United States.
519 AM CDT Mon Mar 13 2017 Upper trough passing ovhd today and preceding it is a narrow band of showers and isolated thunderstorms across SW AR into NE TX. Upper trough lagging behind sfc front and stg nw flow aloft this aftn setting up will continue throughout the week.
457 AM CDT Mon Mar 13 2017 (Today and Tonight) Extensive cloud cover will continue through much of the morning hours, but will get scoured out by late morning or early afternoon as a cold front moves through West Central Texas.
514 AM CDT Mon Mar 13 2017 Northerly winds today will keep the Panhandles cooler than yesterday. This cloud cover will aid in keeping temps overnight from dropping too much and keep most from seeing freezing temps. Lee side troughing will develop in association with downsloping winds during this upper level northwest flow pattern.
It'll be another cold night, but moderating low-level temps and incresing cloud cover ahead of the low pressure system will keep lows in the upper 20s to lower 30s. Low pressure starts to peel away to the east Monday night as the upper level trough swings through.
Models are in fair agreement with swinging a trough out of the Plains and across the Southeast today. They are also in agreement with bringing showers into the forecast area ~18Z as the cold front moves in.
430 AM CDT Mon Mar 13 2017 Influence from high amplitude s/wv trough will continue to progressquickly south and east over the region this morning. Gusty northerly winds expected through the day today behind cold front.
Current temps range from the lower 70s to lower 80s and is running about 10 degrees cooler than yesterday. Development is due to the upper-level trough moving through, a convergence axis and left over boundaries in place. Precip chances decline throughout this afternoon as the convergence axis weakens and the trough weakens and progress eastward. Conds will begin to improve after 20Z as lingering lgt pcpn ends and cigs rise into the low VFR range, with further clearing/scattering expected by 06/03Z. Sct storms will likely redevelop btwn midnight and sunrise as the low-level jet strengthens atop a lingering sfc bndry, and have reintroduced VCTS at both terminals at 07Z.
/Issued 311 AM CDT TUE JUL 5 2016/ Main forecast issue for the next several days will be the excessive heat as a broad upper ridge dominates the southern half of the country.
Near the surface, a lee side trough of low pressure is anchored near and along the Colorado border. A cold front associated with this system will drop south to along the Kansas and Nebraska border this evening.