Aikyam-Lab/Synoptic-Bench huggingface dataset:
636 AM EDT FRI MAY 6 2016 A LARGE UPPER LEVEL LOW MEANDERS NEARBY TODAY. STARTING WITH A WARM FRONT THEN A COLD FRONT SATURDAY. UPPER LEVEL LOW MOVES SLOWLY THROUGH THE MIDDLE ATLANTIC STATES THIS PERIOD. WITH A DECREASING CHANCE WESTWARD THROUGH THE LOWLANDS. EVEN THOUGH THE INTENSITY OF THE UPPER LOW AND ITS DISTANCE FROM THE FORECAST AREA DO NOT CHANGE MUCH. THE WESTERN EDGE OF THE DEEP LAYER MOISTURE AND EVEN THE LOW LEVEL MOISTURE MOVES EAST AS A RESULT. IN RESPONSE TO WARM AND POSITIVE THETA E ADVECTION AHEAD OF A WARM FRONT ARRIVING FROM THE WEST. UPPER LOW ALONG THE COAST WILL OPEN INTO A WAVE AND GET KICKED OFF THE EAST COAST AS ANOTHER DISTURBANCES APPROACHES THE REGION FROM THE NORTHWEST. THIS WILL SWEEP A COLD FRONT ACROSS THE REGION SATURDAY.
402 AM EDT FRI MAY 6 2016 EXITING LOW PRESSURE CENTER IS WEAKENING AND MOVING OFF THE MID ATLANTIC COAST. HIGH PRESSURE RIDGE NOW OVER THE MID MS RIVER VALLEY IS STRENGTHENING AND BUILDING SOUTHWARD. THIS RIDGE SHOULD BE CENTERED OVER LA/SOUTHERN MS BY 12Z SAT. THIS RIDGE WILL KEEP DRY CONDITIONS ACROSS THE AREA THROUGH THE SHORT TERM. BUT EXPECTING THEM TO PICK BACK UP SHORTLY AFTER SUNRISE AS A DECENT PRESSURE GRADIENT WILL EXIST BETWEEN THE EXITING LOW TO THE EAST AND THE HIGH PRESSURE RIDGE TO OUR WEST. TEMPS TODAY WILL START OUT A BIT CHILLY WITH HIGHS GETTING UP INTO THE LOWER TO MID 70S.
323 AM CDT FRI MAY 6 2016 A VERY WARM DAY IS IN STORE FOR THE REGION TODAY WITH UPPER LEVEL RIDGING SLIDING OVERHEAD. COLD FRONT BEGINS DROPPING SOUTHWEST INTO SOUTH CENTRAL AND EAST CENTRAL SD. COULD SEE SOME WEAKENING OF THE CAP THROUGH THE HIGHWAY 14 CORRIDOR LATE AFTERNOON/EARLY EVENING. WILL BE CONSIDERABLY COOLER IN A COLD AIR ADVECTION REGIME WITH HIGHS GENERALLY MID TO UPPER 60S. TEMPERATURES WILL BE SEASONALLY COOL WITH LOWS IN THE LOWER TO MID 40S.
436 AM MDT FRI MAY 6 2016 LARGE CLOSED LOW MOVING ONSHORE THE WESTERN US TODAY WILL SLOWLY MOVE EASTWARD OVER THE NEXT FEW DAYS.
Satl imagery is indc a large upper low spinning along the South Central CA coast just north of Point Conception.
320 AM CDT FRI MAY 6 2016 ISSUE TODAY IS COLD FRONT TIMING AND TEMPS. COLD FRONT SLICING THRU CENTRAL MANITOBA TO ABOUT BRANDON THEN INTO NORTHWESTERN NORTH DAKOTA TO STANLEY. CONSIDERABLE HIGH LEVEL MOISTURE WITH THIS FEATURE TODAY COMING UP AROUND THE UPPER RIDGE INTO THE NRN PLAINS. MUCH COOLER TODAY NE ND WHERE HIGHS TODAY BARELY REACHING 70. HIGH PRESSURE TO BUILD SOUTH TONIGHT INTO SATURDAY.
336 AM EDT FRI MAY 6 2016 A LARGE UPPER LEVEL LOW CONTINUES THE COOL WEATHER TODAY. STARTING WITH A WARM FRONT THEN COLD FRONT SATURDAY. UPPER LEVEL LOW MOVES SLOWLY THROUGH THE MIDDLE ATLANTIC STATES THIS PERIOD. WITH A DECREASING CHANCE WESTWARD THROUGH THE LOWLANDS. EVEN THOUGH THE INTENSITY OF THE UPPER LOW AND ITS DISTANCE FROM THE FORECAST AREA DO NOT CHANGE MUCH. THE WESTERN EDGE OF THE DEEP LAYER MOISTURE AND EVEN THE LOW LEVEL MOISTURE MOVES EAST AS A RESULT. IN RESPONSE TO WARM AND POSITIVE THETA E ADVECTION AHEAD OF A WARM FRONT ARRIVING FROM THE WEST. UPPER LOW ALONG THE COAST WILL OPEN INTO A WAVE AND GET KICKED OFF THE EAST COAST AS ANOTHER DISTURBANCES APPROACHES THE REGION FROM THE NORTHWEST. THIS WILL SWEEP A COLD FRONT ACROSS THE REGION SATURDAY.
DRY CONDITIONS WILL PREVAIL UNDER DEEP LAYER WNW FLOW BETWEEN HIGH PRESSURE TO THE WEST AND A TROUGH ACROSS THE EASTERN CONUS. AFTER NEAR RECORD LOW TEMPS THIS MORNING A WARMING TREND WILL ENSUE INTO THE WEEKEND AS THE RIDGE BUILDS EAST AND ACROSS THE LOCAL AREA. HIGH TEMPS WILL WARM INTO THE MID/UPPER 70S TODAY UNDER BREEZY NW FLOW THEN NEAR CLIMO HIGH TEMPS IN THE LOWER 80S EXPECTED INLAND SAT. MINS TONIGHT WILL NEAR 50 INLAND WITH WARMER UPPER 50S INLAND SAT NIGHT.
THE HOLD UP ON REACHING THESE HIGH TEMPS WILL BE THE COLD FRONT JUST TO OUR NW AT 12Z THIS MORNING. EXPECT THE COLD FRONT TO SINK S AND STRETCH BASICALLY FROM THE SW CORNER OF SD TO THE NE CORNER BY 18Z.
119 AM EDT FRI MAY 6 2016 A MID-UPPER LEVEL LOW PRESSURE SYSTEM IS POSITIONED OVER THE CAROLINAS THIS EVENING. THE COLD TEMPERATURES UNDER THE LOW ARE CREATING BROKEN TO OVERCAST MVFR CIGS AT TYS AND TRI.
AN UPPER LEVEL LOW OFF OF THE CENTRAL CALIFORNIA COAST WILL SHIFT INLAND OVER SOUTHERN CALIFORNIA ON FRIDAY AND RESULT IN SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS THROUGH FRIDAY EVENING.
Dry weather conditions along with a gradual warming trend are forecast to continue into the early part of the upcoming work week as high pressure dominates the weather pattern.
On Sunday night, a cold front will move rapidly across the central plains. With temperatures close to freezing, there could be a mix of rain and snow. The cold front will move through the forecast area on Monday with rain expected for the entire region. Temperatures will be a little milder on Monday with highs in the low to mid 50s. As the cold front moves out of the region Monday night, rain will be ending over far eastern sections in the evening.
High pressure will continue to bring warm and dry conditions to the region with periods of high clouds and locally breezy conditions at times. Overall, expecting temperatures very similar to yesterday, maybe a degree warmer in a few locations.
Rain and mountain snow showers remain across western Montana and central Idaho this morning in the wake of a weak cold front, which passed last evening.
Temperatures will also be noticeably cooler today with highs struggling to reach 60 degrees across northern areas, and topping out in the lower 60s in southern areas.
Cold front this morning will continue to push through the area but CIGS are expected to stay predominantly MVFR through the majority of the TAF period. The cold front early this morning was located roughly along the I-10 corridor. Cooler today with breezy conditions through the morning hours. Warmer monday, especially western areas where some clearing occurs. A weak reinforcing surge of high pressure looks to move into the area Monday afternoon and night.
There are also some mid and high level clouds moving in from the west and obscuring the lower clouds. There will definitely be the higher level clouds, but the stratus will also spread across much of the forecast area. By afternoon, an upper level wave moves into the area and a cold front approaches from the northwest. Aloft: Global models and ensemble means are in good agreement on longwave trofs over the NE Pac and the Ern USA. with the ridge over the Rockies. This high will gradually sink into the MS Vly Tue and drift into the Ern USA as the week progresses. with a warm front developing down here on the Plns. There will be a cold front that moves through the area late this afternoon, turning winds from south to west then northwest.
A freeze Warning remains in effect this evening and through all of the Ozarks as morning lows on Sunday will fall into the lowers 20s to the upper teens.
Cooler post frontal airmass will remain in place through the morning across most of the CWA. With drier northwest flow and lingering cloud cover temperature will struggle to reach 60 across much of the South and Rolling Plains while the southeast Texas Panhandle will have drier air and warmer and breezy southwest surface winds to scour out cloud cover and advect warmer temps into the mid and upper 60s. , a fairly amplified pattern across North America with a western ridge and eastern trough. There are still differences, however, with the details, particularly at the surface in the handling of cold air entrenched underneath the upper trough.
Freezing Temperatures Again Tonight. As our clocks spring forward tonight, temperatures will be dropping well below freezing. Lows Sunday morning will be in the low to mid 20s, but typically cooler low spots across southern IN and the Bluegrass region will likely drop into the upper teens. Temperatures will be below freezing for several hours.
Slight ridging in the lower levels under zonal flow aloft will allow surface winds to shift more easterly this afternoon into tonight and weaken.
/EC/ Monday: As we remain in an active northwesterly upper flow pattern, another disturbance and cold front will zip across the region during the day Monday, bringing a brief chance for showers. Moisture return will be limited ahead of this system, but forcing will be sufficient to overcome this, with the greatest rain chances from the upper Delta eastward along the Highway 82 corridor.
448 AM CDT Sun Mar 12 2017 (Today and Tonight) A cold front has moved through all of West Central Texas early this morning, resulting in cooler temperatures and gusty northeast winds. The next cold front will approach the northern Big Country around sunrise Monday morning.
High pressure aloft will developing across the interior west will bring dry conditions and unseasonably warm temperatures through midweek.
/issued 448 AM CDT Sun Mar 12 2017/ (Today and Tonight) A cold front has moved through all of West Central Texas early this morning, resulting in cooler temperatures and gusty northeast winds. The next cold front will approach the northern Big Country around sunrise Monday morning.
333 AM CDT Sun Mar 12 2017 Upper closed low over the Canadian Maritimes. A trough of low pressure extends southwestward across the Ohio Valley into south Texas, Northwest flow across the Pacific Northwest into the Mississippi valley. Have a mix over the Pine Ridge this morning changing to -rw and spreading east over northern Nebraska in the morning and south through the afternoon into the early evening. A relative shallow layer of Arctic high pressure will begin to lift east from the high plains on Monday and allow quite a range of high temperatures across the cwa. Highs over our far west will be influenced by increasing WAA, with temperatures reaching possibiliy into the lower 50s. Over our far east, the arctic airmass will remain, keeping high temperatures in the lower to mid 20s.
Low pressure will move from eastern Montana into central South Dakota by 12z Sun. Mainly quiet conditions through the first half of the work week as upper ridging builds into the area.
Winds will drop off Sunday afternoon behind a cold front. Cool Sunday night with a bit of a reinforcing push of cooler air dropping down the plains and just clipping the eastern CWA. Dry and mild conditions Monday under northwesterly flow aloft on the front side of an upper ridge over the western CONUS.
But the front will finally push east of the Cascades later Wed, with cooler showery weather for rest of the week.
632 AM CDT Sun Mar 12 2017 Upper closed low over the Canadian Maritimes. A trough of low pressure extends southwestward across the Ohio Valley into south Texas, Northwest flow across the Pacific Northwest into the Mississippi valley. Have a mix over the Pine Ridge this morning changing to -rw and spreading east over northern Nebraska in the morning and south through the afternoon into the early evening. A relative shallow layer of Arctic high pressure will begin to lift east from the high plains on Monday and allow quite a range of high temperatures across the cwa. Highs over our far west will be influenced by increasing WAA, with temperatures reaching possibiliy into the lower 50s. Over our far east, the arctic airmass will remain, keeping high temperatures in the lower to mid 20s.
It is a cold Sunday morning across the Missouri Ozarks region with temperatures starting out in the lower to middle 20s for most locations. Amounts will be light and temperatures will be hovering around freezing where the light snow falls. Northwest winds could gusts up to 30 mph with temperatures in the lower to middle 40s. A deep trough will be over the eastern U.
Tonight, we should be cold again, but with only a couple of hours below freezing in a few spots, I'm going to hold off on issuing a Freeze Warning for now. If it's 6am, then we could see an hour or two of frozen precip (maybe even in the way of freezing rain in our far NW counties), but if it's any later, we should be warm enough to warrant just another cold rain event.
An upper ridge will be over the west coast providing northwest flow to Arkansas through Monday. Low pressure in the Rockies today will bring a cold front through Arkansas on Monday. Lows tonight will be in the 30s and highs on Monday will be a bit warmer in the around 50 to the mid 60s.
Early this morning: A surface pressure ridge axis oriented from southern Iowa to the TX panhandle in combination with yesterday's snowfall (which partially melted in most areas) and clear skies led to the formation of fog across eastern portions of the area shortly after midnight. The lee cyclone will pull east and be positioned over SW Iowa by 06Z Monday.
410 AM CDT Sun Mar 12 2017 Clipper type Low pressure system will drop southeast from the Northern Plains into the middle Mississippi Valley tonight. Temperatures should warm to well above freezing by late morning. Rain chances will decrease from west to east Monday afternoon into Monday evening as the low moves off to our northeast. Another cold Canadian high pressure system will bring drier conditions for the remainder of the short term.
The sfc cold front will slide southeast across the plains late in the morning through early afternoon and should hang up along the Laramie Range. In the higher peaks of the Snowy and Sierra Madre mountains, expect a few inches of snow as the wave moves overhead and the left exit region of the upper jet brings larger scale forcing to this region, with some shower affecting the nearby valleys as well. High pressure building back from the west on Monday will keep the wind prone areas of southeast Wyoming on the breezy side through the day.
High pressure aloft will keep the storm track north of the area through the week.
The 00z raob has plenty of dry air and potential for evaporational cooling in the lower levels, but the web bulb temperature is above freezing and least in the central part of the area.
At the surface, low pressure is starting to take shape in the lee of the Wyoming Rockies. 00Z model guidance now in good agreement showing the low track moving along the SD/NE border and across southern IA/northern MO by 12Z Monday.
High pressure ridging will continue to bring well above normal temperature through early this week, though record breaking highs are not expected. In the Valley highs in the mid to upper 70s are expected, with a few spots reaching the lower 80s.
327 AM EDT Sun Mar 12 2017 An upper level disturbance will pass to the southeast early this morning followed by high pressure ridging in from the north this afternoon through tonight.
At that rate it should be trough Memphis by around 8 am and near Tupelo by 11 am. There is some fog/freezing fog behind the line where temperatures dropped to the dew point. Dew points in East Arkansas are around 25 to 27 degrees with temperatures only a few degrees warmer. Highs are expected to range from the low 50s in most of North Mississippi to the low 40s in far Northwest Tennessee, the Missouri Bootheel, and East Arkansas. but if we see cooler temperatures the snow potential will increase.
Current dew points are into the single digits across NE TN and into the lower teens across the Central Valley N of I-40 this morning.
As noted in the previous discussion, a weak area of low pressure at the surface remains evident off of the Texas coast at this hour, with high confidence in this feature remaining weak through the period. Much cooler high temperatures are expected today, with locations north of the front in AL and GA in the low to mid 60s, and upper 60s to low 70s south of the front across north Florida.
and Monday Middle and high clouds will be on the increase today as an upper trough approaches from the northern Plains.
643 AM CDT Sun Mar 12 2017 Concern for short term is snow tonight and Monday with lake enhanced snowfall at the head of the lake Current surface analysis indicates cloudy skies along the north with clear to partly cloudy skies elsewhere as the ridge dominates the weather early this morning. The low level flow will remain north to northeast with 850MB temperatures over Lake Superior around -20C Monday night.
High Low pressure will approach the area today, sliding by to the southwest tonight.
331 AM CDT Sun Mar 12 2017 Early this morning: A surface pressure ridge axis oriented from southern Iowa to the TX panhandle in combination with yesterday's snowfall (which partially melted in most areas) and clear skies led to the formation of fog across eastern portions of the area shortly after midnight. The lee cyclone will pull east and be positioned over SW Iowa by 06Z Monday.
A cold front will be sent southward across the panhandles late this afternoon and this evening in response to the passing short wave to our north. There may be just enough moisture in the far northeast CWA to help with some shower formation as the cold front moves across this area, but any rainfall should remain very light. Southwest winds will be around 20 mph with higher gusts, but winds will be shifting to the north behind a cold front late in the afternoon and early evening.
1024 AM EDT Sun Mar 12 2017 High pressure will bring one more cold, dry day today. Low pressure is forecast to bring rain and snow Monday, changing to all snow Monday night.
Through tonight Snow continues to progress east out of eastern South Dakota and southwest Minnesota as low pressure heads our way. At the surface, low pressure is starting to take shape in the lee of the Wyoming Rockies. 00Z model guidance now in good agreement showing the low track moving along the SD/NE border and across southern IA/northern MO by 12Z Monday.
High amplitude ridging will begin to build over the forecast area on Monday as the area of high pressure remains centered over southern California. This ridging will persist for several days; through at least midweek.
02z temps across extreme north GA are running in the lower to mid 30s already which is about 5-7F degrees below earlier forecast. Based on the latest observations and trends, could see a few locations across extreme north GA drop below 30F tonight which will increase the potential to see accumulating snow on roadways, especially bridges and overpasses.
In addition, precipitation will taper-off for most by this afternoon as a stabilizing high pressure ridge aloft builds-in from the Pac NW. Freezing drizzle may mix with the snow north of the surface front, but any ice accumulations should be no more than a trace.
Locations along and south of Highway 80 and the Hal Rogers Parkway look to drop off into the low to mid 20s, a bit warmer than currently forecast. As such, have made a few adjustments to the lows, otherwise the rest of the forecast is on track. Fortunately, high pressure nosing in from the north will keep winds fairly light through the period, limiting overall fire danger. Another night of freezing temperatures is anticipated Sunday night as skies clear off allowing valleys to decouple and drop off. Thus, the threat of freezing weather on early vegetation will continue over the next few nights. A significant mid/upper level trough will dive southeast over the eastern CONUS early in the period.
An area of low pressure will develop over the northern plains during the day Sunday.
A ridge of high pressure over the region will provide mostly dry conditions today.
Lows tonight will be in the teens to around 20 and highs on Sunday will be in the lower to middle 30s.
/issued 346 AM CDT Sun Mar 12 2017/ Convection associated with an upper short wave trough and surface front is ending this morning, with a few reports of large hail and strong winds having been received yesterday evening. ridge will send another cold front into the area tomorrow, but temperatures will actually be warmer behind this front due to mostly clear skies allowing for much more insolation than will be seen today.
Have pulled mentioned of thunder out of the grids as the cold front has cleared the forecast area. /issued 254 PM CST Sat Mar 11 2017/ The cold front is currently marching its way through the region at a rapid rate.
Weak ridging builds into today limiting shower chances to mainly the mountains during the first half of the day. This means rain for all but the highest elevations.
Skies are then expected to clear out tonight as high pressure builds into the region. By Sunday afternoon, high pressure will shift east of the area and warmer air will begin to advect back into the area. Sunday night into Monday, an upper level trough will dig through the Plains into the Midwest. This will keep the local area in the warm sector as precipitation develops out ahead of an associated cold front.
Temperatures this morning range from the mid 20s across north central KY to the lower 30s across south central KY. As clouds continue to clear, we still are on track for lows to bottom out in the lower to mid 20s across the region. For the remainder of today, high pressure will build in from the northwest bringing mostly clear skies. Despite light northerly winds, with plenty of sunshine we should warm into the lower to mid 40s today. Temperatures tonight do look to drop below freezing, but for a shorter length of time than this morning and only into the upper 20s to around 30.
This is giving us a large area of 3 to 6 inches, but with not quite the high amounts as 24 hours ago.
1224 AM CST Sun Mar 12 2017 Low pressure was over the lee of the Rockies with light snow developing over eastern Montana and into western North Dakota.
Potent trough over the PAC NW will quickly advect SE and support a vigorous clipper type system into the region Sunday. Mixing will allow temps to rise above freezing over the SW half, which should remain above freezing most of Sunday.
Snow will then move in west to east from late this afternoon into the evening as low pressure approaches the area, bringing lower ceilings and visibilities.
Will let the freeze warning expire at noon over southern 6 counties where temps currently rising toward freezing. Latest surface analysis shows sprawling ridge of high pressure extending from northern Canada into the Mississippi River Valley. Low pressure currently over Montana will track southeastward tonight, reaching southeast Iowa by 12z Monday. Low pressure will track from southeast Iowa early Monday morning to west-central Indiana by Monday evening. Once the low passes to the east, a trailing trough axis will keep light snow chances alive into Monday evening.
Upper trof across the northern U. Ahead of the system winds will increase from the west across southern CO as surface lee trof deepens in response. Critical fire weather conditions will develop along the lower eastern slopes of the southeast mountains and adjacent plains and spread eastward through the afternoon across the most of the plains. save for the southeast corner where winds may actually decrease some in the afternoon before the cold front drops through and humidities creep up. central mountains will see some orographically enhanced snow showers develop during the late morning through the early evening as energy and moisture from the upper trof spreads in. By 00z cold front will have moved through all of the southeast plains.
830 AM MDT Sun Mar 12 2017 We have issued a quick update to expand the High Wind Warning east into Cheyenne. The sfc cold front will slide southeast across the plains late in the morning through early afternoon and should hang up along the Laramie Range. In the higher peaks of the Snowy and Sierra Madre mountains, expect a few inches of snow as the wave moves overhead and the left exit region of the upper jet brings larger scale forcing to this region, with some shower affecting the nearby valleys as well. High pressure building back from the west on Monday will keep the wind prone areas of southeast Wyoming on the breezy side through the day.
324 AM CDT Sun Mar 12 2017 Latest surface analysis shows sprawling ridge of high pressure extending from northern Canada into the Mississippi River Valley. Low pressure currently over Montana will track southeastward tonight, reaching southeast Iowa by 12z Monday. Low pressure will track from southeast Iowa early Monday morning to west-central Indiana by Monday evening. Once the low passes to the east, a trailing trough axis will keep light snow chances alive into Monday evening.