Aikyam-Lab/Synoptic-Bench huggingface dataset:
253 PM EDT Tue Jun 20 2017 Bermuda high pressure will remain centered offshore this week, but will continue to extend back to the west over the Eastern Carolinas. A cold front dropping southeast will stall just inland from the coast today before dissipating by Wednesday. Late in the day upper support will weaken as the upper trough deamplifies north of the area, although the air mass will remain in a soupy fashion into the evening.
At 2 am, temperatures were mainly in the lower to middle 60s across the Mid-State, and patchy fog was observed at various locations. Cirrus clouds, on the fringes of the tropical system over the Gulf, were already streaming northward across the Mid- State, and you can expect atmospheric moisture to be on the increase over the upcoming days, as this system tracks to the northwest and into the Lower Mississippi Valley.
400 PM EDT Tue Jun 20 2017 Currently - A tight pressure gradient remains in place along the Florida Keys due to Tropical Storm Cindy in the central Gulf of Mexico and a surface Atlantic ridge to our northeast. Drier air has moved in through the lower levels, and despite a still fresh flow, shower development has remained isolated across the forecast area. A small craft advisory will remain in effect for most Keys waters due to a tight pressure gradient between Tropical Storm Cindy and a surface Atlantic ridge. Thereafter, an Atlantic ridge will set up across the Florida Peninsula maintaining moderate to occasionally fresh east to southeast breezes across the Florida Keys.
Warm temperatures and breezy conditions are still expected for this afternoon and into the evening ahead of an approaching cold front. Cooler, near average, temperatures settle in on Wednesday behind the cold front, and breezy conditions will develop by the afternoon.
Dewpoint temperatures were in the lower to mid 60s. The upper low pressure trough was moving to the eastern US, with a northwest upper flow still into AR.
531 PM CST Fri Jan 5 2018 The forecast area has largely been dominated by two halves today with a persistent stratus deck with relatively warmer temperatures west and clear skies with relatively colder temperatures east. High pressure responsible for our recent brutally cold temperatures finally slowly nudges east Saturday with an approaching warm front from the west.
Satellite imagery and sfc observation continue to show high clouds through the late evening into middle of the night as an upper level trough swings west to east through the nrn Gulf of Mexico. Most of the high clouds will be shifting just south of the forecast area around sunrise Saturday. A few locations in southeast GA already at or below freezing with inland NE FL in the mid 30s.
412 PM CST Fri Jan 5 2018 Upper ridge over the Intermountain West region will build east through late Saturday and then deamplify across the Panhandles.
335 PM MST Fri Jan 5 2018 High pressure will weaken over the weekend as a disturbance brushes northern Arizona.
An upper trough will shift inland tonight with showers tapering. Saturday will be mainly dry with weak high pressure aloft.
The upper ridge axis moves across the CWA on Saturday and the flow aloft is zonal, but still pretty strong. High temperatures on Saturday will be close to or a tad warmer than this afternoon's highs. An upper level trough over the Northern Great Basin/Northern Rockies Saturday will dive southeast across Great Basin/Central Rockies Saturday night. Best lift associated with this trough looks to be over western and into central Colorado.
Latest surface observations show temperatures have rebounded quite a bit from this morning's lows in the single digits and teens, with current readings ranging from the low 20s on the Plateau to above freezing in southwest zones.
511 PM CST Fri Jan 5 2018 Deep Polar low remains situated over southern Quebec/northeast CONUS with weak upper ridging approaching the Rockies. At the surface, high pressure extends from western Ontario down through the upper Mississippi Valley.
514 PM CST Fri Jan 5 2018 Temps tonight will drop into the teens and perhaps a few single digits across the eastern Ozarks as a strong area of high pressure moves to our northeast and winds switch east- northeasterly. High temps tomorrow will be somewhat similar to today with a range from the low 40s west to the upper 20s east.
500 PM MST Fri Jan 5 2018 Aviation Section Updated Weak ridging over the region will continue to bring warm temperatures and gusty westerly winds to the Plains while the valleys of southwest Montana struggle to climb out of the teens. The next cold front sweeps through the region during the day on Saturday with mainly mountain snow expected.
Heading into the weekend, an upper ridge will build into the region. As this ridge moves into place expect showers to become isolate Saturday morning then taper off.
Increase heights in the lower levels has allowed this layer to warm with the freezing level ascending 2700ft yesterday evening to 8200ft this evening. With a weak flow below 850mb, large inversion will develop with temperatures at many locales falling to near and below the freezing mark overnight.
1030 PM EST Fri Jan 5 2018 The deep upper trough over eastern Canada and the northeastern U.
801 PM EST Fri Jan 5 2018 Evening MFL RAOB sounding indicated dry air from the surface up to the mid levels with light north/northeast flow in the lower levels. /issued 426 PM EST Fri Jan 5 2018/ Deep troughing remains draped along the mid-Atlantic, transitioning to more of a zonal flow pattern over the Florida peninsula. The 12Z MFL sounding showed light northerly winds from the surface to 850 mb with very dry air in the lower and middle levels of the atmosphere. This has allowed for chilly weather this afternoon, with maximum temperatures only reaching the lower 60s. Heading into the weekend, models push a dry mid-level trough across the Gulf of Mexico and towards the Florida peninsula.
336 PM MST Fri Jan 5 2018 The upper level ridge will remain over the area tonight, but will be flattened by an incoming disturbance on Sat.
1052 PM EST Fri Jan 5 2018 The deep upper trough over eastern Canada and the northeastern U.
914 PM EST Fri Jan 5 2018 The main forecast challenges for the overnight period continue to be the threat for sub-freezing temperatures and how much radiational cooling will be seen. Farther to the south, where there is more cloud cover forecast, temperatures will stay a bit "warmer" but still quite cold. Areas along and south of the I-4 corridor will see low temperatures in the 33 to 35 degree range and a couple of degrees of warmer closer to the coast.
735 PM EST Fri Jan 5 2018 Low pressure will track across Labrador tonight through Saturday.
517 PM EST Fri Jan 5 2018 Low pressure will track across Labrador tonight through Saturday.
/ISSUED 353 PM CST Fri Jan 5 2018/ High pressure centered over Louisiana and Mississippi has our light easterly breezes veering a bit more southerly.
1019 PM EST Fri Jan 5 2018 Low pressure will track across Labrador tonight through Saturday.
407 PM CST Fri Jan 5 2018 The cold front has moved south to near Interstate 40, and continued pressure falls in southern Oklahoma suggest that it will likely continue to drift south this evening. But there are no significant impacts with this front as temperatures are only slightly cooler north of the boundary.
A few low clouds could also be possible late in the period over Eastern Oklahoma as moisture returns ahead of the next approaching cold front. These somewhat mild temperatures look to continue through the weekend as relatively strong warm air advection ahead of the next system advects warmer temperatures, and increasing low-level moisture, into the Southern Plains.
413 PM MST Fri Jan 5 2018 Breakdown of the western ridge will be completed tonight as a fast moving Pacific system tracks east-southwest across the Great Basin.
While WWA is not expected to be strong, a southerly component to the wind should at the very least allow for slightly warmer temperatures than what was experienced on Saturday with more sun than clouds expected on Saturday.
These high clouds, in addition to light east/southeast winds, will help keep overnight lows warmer than the past few mornings in the mid 30s to lower 40s inland and near 50 along the coast. /ISSUED 353 PM CST Fri Jan 5 2018/ High pressure centered over Louisiana and Mississippi has our light easterly breezes veering a bit more southerly.
02 UTC surface analysis shows an area of high pressure centered just NW of Dothan, AL. High pressure is quite close to the forecast area tonight and as such the surface winds nearly everywhere have gone calm. This has resulted in temperatures dropping very quickly this evening with a number of sites already at or below freezing. What's interesting is that the T/Td spreads still remain relatively large (8-12 degrees or so), suggesting at least the potential for temperatures to reach the low to mid 20s before sunrise should ideal radiational cooling conditions stay present.
/issued 426 PM EST Fri Jan 5 2018/ Deep troughing remains draped along the mid-Atlantic, transitioning to more of a zonal flow pattern over the Florida peninsula. The 12Z MFL sounding showed light northerly winds from the surface to 850 mb with very dry air in the lower and middle levels of the atmosphere. This has allowed for chilly weather this afternoon, with maximum temperatures only reaching the lower 60s. Heading into the weekend, models push a dry mid-level trough across the Gulf of Mexico and towards the Florida peninsula.
Showers associated with an upper trough have been increasing in coverage in southeast Oregon during the past hour. The showers will continue to shift east into southwest Idaho overnight as the trough moves into Oregon. There is a slight chance of light freezing rain from west of Boise to Baker City where temperatures could lower to near or slightly below 32F in some locations overnight. The showers will diminish in southeast Oregon but will continue in southwest Idaho Saturday morning as the trough moves further east. Showers will end most areas by late Saturday afternoon as the trough moves into eastern Idaho. Freezing rain threat remains around KONO and KEUL for early Saturday morning.
Aloft - A ridge across the western states. slips slightly eastward overnight as a low above ME exits to southeastern Labrador while continuing to trough south to the Gulf of Mexico. Surface - Sprawling high pressure across the Deep South will be reinforced overnight by a Canadian air mass that slides through the Upper MidWest and into the Mid-Mississippi and Ohio Valley regions by day break. The troughing aloft is providing some robust west and southwest winds. This will help keep temperatures from dropping too quickly in the evening but then allow them to fall to freezing to sub-freezing in the northern counties and near freezing for central counties. High pressure north of the waters will start to be reinforced later tonight.
359 PM MST Fri Jan 5 2018 Breakdown of the western ridge will be completed tonight as a fast moving Pacific system tracks east-southwest across the Great Basin.
Expect a few lingering showers today as moist air and a weak warm front approach from the west. Temperatures are much cooler this morning with most areas in the 40s to lower 50s. High pressure will begin building over the Eastern Pacific. A weak warm front moving across today will keep a slight chance of light showers through the day, but not much rainfall is expected. The upper ridge will strengthen along the coast by the coming weekend bringing in drying conditions and warmer temperatures.
621 AM EST Wed Jan 10 2018 High pressure centered over New York will move off the Atlantic coast today.
/issued 423 AM EST Wed Jan 10 2018/ Synopsis: A deep layer area of low pressure over the eastern Gulf of Mexico has been producing cloudiness and showers to its east, mainly from the east coast of Florida to the Bahamas over the past day or two. The surface and low-level portion has weakened to a trough, but the low is still closed in the mid-levels and evident in the upper levels. Over the next day or so, expect the surface feature to continue dissipating while the mid-upper low moves slowly eastward over the Florida Straits and South FL. Maximum temperatures today are forecast in the upper 70s, a few degrees warmer than seasonal norms. On Thursday, the mid-upper low will weaken while moving eastward toward the Bahamas.
Increasing south- southeasterly winds today will help to boost temperatures several degrees warmer than yesterday. Deepening low pressure over the Central Plains and a sharpening mid- level trough of low pressure will help to pump in more Gulf moisture. Lows will be much warmer and well above average. Prefrontal trough looks to move through the region from the west- northwest by late Thursday morning shifting winds towards the west- southwest. Expect temperatures to climb into the low to mid-70s ahead of the cold front passage Thursday afternoon.
Skies will remain cloudy as temperatures will be a bit warmer today. But tomorrow will see changes again in the weather as a strong cold front that is moving into the northern Rockies this morning will drop south along the east slopes of the Rockies and into Kansas around midnight tonight.
Aloft, upper level ridging will begin to spread east as a developing trough begins to dig deeper into Texas by later this afternoon. Southerly flow will continue to bring in more moisture, which may again cause some patchy fog development early Thursday, especially if there is any moisture pooling ahead of our next cold front and if winds go calm just prior to fropa Thursday morning. Given the highly mixed boundary layer, wind gusts may also approach wind advisory criteria during the afternoon, especially inland.
A cold front will approach the KABI terminal towards the end of the forecast period and will move across the terminals Thursday morning. An upper level trough over southern Arizona early this morning will approach the Texas Panhandle by late today. As the above mentioned upper trough ejects eastward across the Plains, an attendant cold front will sweep across the area late Wednesday night and Thursday morning.
Drier weather and a warming trend will return Thursday into the weekend as high pressure builds back over the area. However, highs will struggle to get out of the low 60s this afternoon amidst modest cold air advection, bringing a rare day where temperatures will be below seasonal normals. This will be short-lived as ridging slowly rebuilds near the Pacific Coast and expands eastward.
The upper low tracking east across Arizona will maintain light precipitation across portions of southern and eastern Utah this morning.
306 AM PST Wed Jan 10 2018 High pressure building in aloft will support significantly warmer conditions starting today and peaking this weekend. Yesterday's storm is over Arizona and now dry NW flow coming down the east side of an east Pac ridge covers the state. Areas of low clouds have spilled out of the low level moisture left in the wake of ydy's rains.
/issued 602 AM CST Wed Jan 10 2018/ Skies are cloudy across the forecast area early this morning with temperatures ranging from the lower 40s to lower 50s. Warmer air has started to lift north from the Gulf of Mexico toward the forecast area. Temperatures will be warmer as well with highs in the upper 50s to lower 60s. More showers will be possible tonight as warmer air continues to move into the region. On Thursday, a strong cold front will be moving across the plains and into Arkansas. Temperatures will be a few degrees warmer than today with highs in the mid 60s. The cold front will move through the region Thursday night producing more precipitation. Most areas will see a transition from rain to freezing rain and sleet before a change over to snow.
SOUTHEASTERLY WINDS WILL DEVELOP, WITH SOME DOWNSLOPE INDUCED DRYING OF THE LOW LEVELS BETWEEN 17Z AND 00Z.
Expect much cooler temperatures today along with gusty winds, especially east of Tucson.
However, moving forward between 04-06Z Thursday, a cold front will move south shifting winds from southwesterly to northerly. Southwest winds of 30 to 40 knots continue to be sampled by KAMA 88D through a deep layer of the lower atmosphere. Chances for showers increase this evening as mid-level trof axis enters western sections. Strong cold front moves into northwest sections early this evening, and then sweeps across remaining sections overnight. Strong north winds with cold front will occur, with an additional or separate wind advisory or high wind warning perhaps being needed.
400 AM MST Wed Jan 10 2018 Upper analysis shows a trough in the northern stream coming into phase with another trough/low pressure center in the southern stream. The combined upper trough will cross the forecast area today and tonight. A cold front extends from the Manitoba low into Montana early this morning. The cold front will sweep southward into the forecast area a little later this morning and then will move from north to south today reaching south central South Dakota later this afternoon. Post frontal lift combined with synoptic scale enhancement from the upper trough will lead to light snow across the area today into tonight.
An upper level trough over Arizona moves into the Central Plains by Thursday morning forcing a prefrontal trough into the Edwards Plateau and Rio Grande Plains overnight. A secondary trough moves across Texas on Thursday forcing a cold front across our area late morning into afternoon. There will be sufficient moisture for chances of showers across eastern parts of our area with some instability along the Highway 77 corridor for possibly isolated thunderstorms late morning into early afternoon. The secondary trough will bring some cloudiness to possibly hamper mixing of stronger winds aloft.
940 AM EST Wed Jan 10 2018 Sfc data shows moderate pressure gradient across the region with 1030+ mb high over the Mid Atlantic and low pressure near the FL southeast coast. Well-defined mid to upper level low across the southeast GOMEX is forecast to push east through tonight with increasing subsidence aloft coming in over our area in through the next 24 hrs. Strong high pressure to the north of the waters will provide for easterly winds of 15-25 kt today.
/issued 408 AM CST Wed Jan 10 2018/ Skies are cloudy across the forecast area early this morning with temperatures ranging from the lower 40s to lower 50s. Warmer air has started to lift north from the Gulf of Mexico toward the forecast area. Temperatures will be warmer as well with highs in the upper 50s to lower 60s. More showers will be possible tonight as warmer air continues to move into the region. On Thursday, a strong cold front will be moving across the plains and into Arkansas. Temperatures will be a few degrees warmer than today with highs in the mid 60s. The cold front will move through the region Thursday night producing more precipitation. Most areas will see a transition from rain to freezing rain and sleet before a change over to snow.
Temperatures continue to slowly rise so threat of freezing drizzle and slick spots will decrease in the next several hours. Areas of fog likely to persist into Thursday, as even warmer air spreads into the area tonight. Initial surge of low level rh and warmer air aloft triggering patchy drizzle across the area. Temperatures at many locations still right around or slightly below freezing so will continue to mention -fzdz threat through the early morning. Will continue small chances for -ra as upstream cold front and trof approach from the west.
The weather changes arrive tonight as a strong cold front surges south, accompanied by intense north wind gusts of 45 mph, while from the south a closed upper low pressure system begins to fill as it lifts northeast across Kansas, eventually phasing with the northern stream trough. What remains consistent with the forecast and where confidence is the highest is that sharply colder air will surge south tonight with intense north winds. The timing of the cold front is on track, with the cold air moving into our northwest zones around 02Z and the front clearing our Kansas counties by morning. As quickly as the winter storm system moves in tonight, it moves out just as fast Thursday morning with snow ending from west to east behind the departing upper trough axis.
High pressure and weak offshore flow will bring warm and dry weather this coming week. High pressure aloft will bring a nice warming trend Thursday and beyond.
Visible satellite images show the Lower Keys are directly under a cusp of the western edge of upper level cloud shield. However, this is thinning as the mid/upper level trough/low nudges eastward. Temperatures along the island chain are in the lower 70s with winds settling into a northeast to easterly light/gentle flow.
/issued 333 AM CST Wed Jan 10 2018/ Water vapor imagery depicts a strong upper low INVOF SW AZ moving e. By 21Z today the mid/upper level trough axis will be just to the w and 7h-5h OMEGA fields suggest there will still be lift. Mid level winds veer strongly though between 21Z-24Z implying passage of the trough/onset of subsidence. Pattern then repeats with warmer wx Sun and another cold surge Mon which may persist thru Wed.
411 AM MST Wed Jan 10 2018 The closed low rolling in from the west is centered over Arizona and pumping deep moisture southwest to northeast into the Four Corners. Those areas not receiving precipitation yet, including much of northwestern Colorado, the Roaring Fork valley, the NW Colorado and NE Utah valleys and I-70 toward Vail Pass, will see a quick change in conditions later this morning as part two - the associated cold front - passes through and shifts winds from southwesterly to west and northwesterly bringing cooler air and lowering snow level.
408 AM CST Wed Jan 10 2018 Skies are cloudy across the forecast area early this morning with temperatures ranging from the lower 40s to lower 50s. Warmer air has started to lift north from the Gulf of Mexico toward the forecast area. Temperatures will be warmer as well with highs in the upper 50s to lower 60s. More showers will be possible tonight as warmer air continues to move into the region. On Thursday, a strong cold front will be moving across the plains and into Arkansas. Temperatures will be a few degrees warmer than today with highs in the mid 60s. The cold front will move through the region Thursday night producing more precipitation. Most areas will see a transition from rain to freezing rain and sleet before a change over to snow.
Slightly warmer low 50s and edging this way from the South and East where the fog is a good bit thicker at this time. Shallow moisture remains trapped under an inversion of much warmer air aloft so little change in sky condition can be expected without better mixing. Little change in the short term to mid term picture with our next cold front set to move in Thursday late afternoon and all evening with still the expectation from SPC for some isolated Thunderstorms mainly during the afternoon ahead of the front. Heights aloft will fall off quickly in the deep trough and a mix of rain and snow will coincide with predawn and early morning low to mid 30s on the surface. A few bridges may end up with some accumulation if the back edge of precipitation is slow to clear.
408 AM CST Wed Jan 10 2018 Impressive vapor imagery this morning of upper low which recently came ashore over southern California. The associated strong cold front will enter NE OK around sunrise Thursday and quickly sweep through western AR by mid to later afternoon. That being said, large scale lift will remain over the region as the cold front sweeps eastward and light precip is likely with all precip type transitions shown in forecast soundings as the cold air deepens.
Temperatures are trending slightly cooler than previously forecast, but still plenty of time to warm into the upper 50s and low 60s in some places.