Aikyam-Lab/Synoptic-Bench huggingface dataset:
644 PM CDT Mon Apr 24 2017 High pressure will keep conditions tranquil for another night, under mostly clear skies. The south winds will bring warmer air to the region, along with a warm surge at 850mb. That will keep overnight lows about 10 degrees warmer than last night, with lows bottoming out in the lower 50s. On Tuesday, low pressure advancing eastward across Oklahoma will be associated with a frontal boundary extending north into the western Great Lakes region. Showers and a few storms will be possible late Tuesday night in response to low pressure lifting NE from the southern Plains toward eastern Iowa.
Upper low now positioned over Ga but mostly cloudy skies still prevail.
1010 PM EDT Mon Apr 24 2017 An upper level low over the Carolinas will continue to slowly pull away from the region overnight.
As we go into Tuesday the pattern temporarily changes as a mid/upper level trough forms to our west and encroaches the area with SW flow aloft Tuesday. At the surface a ridge of high pressure will nose into the area Tuesday afternoon and evening, which will be the trigger for strong storms. Storm mode appears to be mostly linear, especially as it approaches far eastern Kansas and western Missouri, since deep shear vectors look to be rather parallel to the cold front boundary.
Upper level low will continue to push eastward into the Atlantic tonight, with northwesterly flow continuing across the area. Lows will be in the low to mid 50s. Upper-level ridging builds into the area today ahead of a deepening trough over the Great Plains.
/issued 232 PM CDT Mon Apr 24 2017/ Height and pressure falls tonight and Tuesday ahead of a trough digging southeastward through the Pacific Northwest and Great Basin will result in a breezy to windy 24 hour period. This in turn will lead to mild overnight temperatures favoring the warmer end of a narrow range in the objective guidance. Thickening mid and high clouds during the afternoon may slightly limit wind speeds but may end up having more of an effect on temperatures with highs likely cooler by a number of degrees for areas on the Caprock.
The low pressure moving over northwest MN will keep the south to southeast winds going overnight, but at a much lower level, around 10 to 20 mph, rather than the 20 to 30 mph levels this afternoon. The mixed boundary layer will remain mild in the lower to mid 50s tonight, despite only some high clouds above. Despite the expectation of mostly cloudy skies by early afternoon, the strong mixing ahead of the cold front will bring highs back the lower to mid 70s, and even upper 70s from west to east. Dry conditions are mainly expected as saturation should only occur along and west of the cold front tomorrow due to the slow moisture advection into this impressive warm draw.
It should not be as hot tomorrow as previously thought because of the strong gusty winds and the high level cloudiness expected. Expecting afternoon highs to climb into the lower to mid 90s.
High pressure moves in for tomorrow with clearing skies and rebounding temperatures. Chattanooga Airport, TN 53 79 57 85 / 10 10 0 10 Knoxville McGhee Tyson Airport, TN 54 76 56 85 / 10 10 10 10 Oak Ridge, TN 52 78 56 85 / 10 10 0 10 Tri Cities Airport, TN 51 71 52 84 / 40 10 10 10.
However, the tilt of the trough which the upper low is associated with is a little fuzzy.
1029 PM EDT Mon Apr 24 2017 Under partly cloudy skies and northwest winds averaging near 15 mph, temperatures are in the lower to mid 70s along the island chain. Surface wise, a cool front is draped just east of the easternmost Florida Straits, with a ridge of high pressure located over the western Gulf of Mexico. (Rest of Tonight) In wake of the cold front which pushed through our entire county warning area late this evening, slightly cooler and drier air will filter in.
High pressure aloft and at the surface will continue over our area through tonight. Upper low currently situated to our southeast over Georgia will continue moving east. The southerly flow will allow warmer temperatures with readings in the upper 70s/around 80.
The pattern will then change by late week as a ridge builds off shore over the Pacific, resulting in warmer and drier conditions for northwest California.
/issued 317 PM CDT Mon Apr 24 2017/ Beautiful weather on tap for tonight and Tuesday with cooler and drier air firmly in place.
Meanwhile main upper level low was developing over scntrl WY and associated mid lvl ascent was allowing for showers to increase in the nrn mtns. GOES-16 water vapor satellite imagery showing a short wave trough over northern Nevada and southern Idaho. This should result in rain and snow over the high county. Moist westerly flow around the base of the trough will result in orographic lift over the mountains which will also help produce precipitation. The highest amounts are expected to be over the northern mountains. By afternoon, the next short wave trough digs southeast and will be centered over the Four Corners. Best lift will be south of I- 70, so will have the highest pops here. Cloud cover and a cooler airmass will result in cooler high temperatures with readings in the mid to upper 50s.
As the area of pcpn moves up toward the Lake of the Woods, temps are a little warmer too, so the threat of heavier accumulating snow should end. Thereafter, as the low continues to shift east tonight, the pcpn will slowly end from west to east. North winds will encompass the entire FA, and temps will drop in areas that were warmer today.
High pressure will bring mostly dry weather tonight and the first part of Tuesday.
Piece of upper level energy kicking out of a 500 mb trough over the southern rockies Tue, lifting northeast across the Upper Mississippi River Valley Tue afternoon/night. The bulk of the saturation lies along and west of the cold front though, where the best lift is also expected. The mean 500 mb trough slides east Wed, with the axis into the local area Thu morning. The cold front stays ahead of the trough, moving across mich by this time. What minor CAPE indicated in the GFS/NAM for Tue night lies outside of the higher rain threat - far northeast IA/southwest WI.
1103 PM EDT Mon Apr 24 2017 High pressure will build across northern Maine and the maritimes overnight.
1154 PM CDT Mon Apr 24 2017 Have been monitoring freezing drizzle potential in the Langdon/Cando areas this evening. However, the NAM does have some light QPF through 09Z with the absence of ice crystals in the column (with temps warmer than -10C). As the area of pcpn moves up toward the Lake of the Woods, temps are a little warmer too, so the threat of heavier accumulating snow should end. Thereafter, as the low continues to shift east tonight, the pcpn will slowly end from west to east. North winds will encompass the entire FA, and temps will drop in areas that were warmer today.
Sunny high pressure will lift all sites to VFR by 15Z.
deep west to northwest flow will continue as the large low pressure just to our north slowly lifts out to the northeast. only slight tweaks to the cooler overnight lows in the lower to mid 50s.
This shud help keep temps on the warmer side despite mostly clear sky. Mdl solns differ regarding a s/w ejecting from the upper low early Tues morning that may generate TSRA impacting the wrn portions of the CWA around sunrise into at least mid morning hours. Tilly Convection will move into parts of northeast and central MO and southwest IL Tuesday night as a deepening upper level trough and associated cold front approaches. Upper level divergence will also be increasing ahead of the approaching upper level trough.
satellite shows upper low moving southeast across the region. Track of the low center along with model forecasts of upper level dynamics suggest showers will continue through the evening then taper off overnight. Upper level ridge will briefly cross the area Tuesday with partly sunny skies. Surface gradients with building high pressure Wed afternoon will create windy conditions.
An upper low over South Carolina is forecast to move slowly northeast overnight. Pgrad will slacken as the low pressure system lifts up the eastern seaboard.
A cold front is south of the forecast area, with breezy west to northwest winds continuing for the next few hours before lessening for the overnight period. Lows will be several degrees cooler than yesterday with dew points forecast to be almost 10 degrees lower.
1154 PM EDT Mon Apr 24 2017 Will maintain a gradual thickening/lowering of cigs overnight into Tuesday as Atlantic moisture pivots back northwest into area around upper low to the south/southeast. Large upper level low over the Southeast Conus will pull back some Atlantic moisture into the Central Great Lakes Tonight into Tuesday morning, with PW values approaching 1 inch. Moistening of the low levels and mid level clouds will level out our warming trend for a day, as maxes likely only peak near 70 degrees. Amplifying upper level trough west of the Mississippi River Valley as copious amount of upper level energy off the coast of the Pacific Northwest moves onshore.
Gusty synoptic winds will diminish later this evening, ushering in just enough cooler and drier air for overnight lows to drop into the 60s across all of South Florida. /issued 334 PM EDT Mon Apr 24 2017/ Afternoon surface analysis indicated a weak cold front extending roughly from Melbourne to Fort Myers, steadily moving into the forecast area.
702 PM EDT Mon Apr 24 2017 Guidance (and models) are pretty insistent on allowing Atlantic moisture to back northwest into area as upper low to the south lifts slowly towards the mid Atlantic states. Large upper level low over the Southeast Conus will pull back some Atlantic moisture into the Central Great Lakes Tonight into Tuesday morning, with PW values approaching 1 inch. Moistening of the low levels and mid level clouds will level out our warming trend for a day, as maxes likely only peak near 70 degrees. Amplifying upper level trough west of the Mississippi River Valley as copious amount of upper level energy off the coast of the Pacific Northwest moves onshore.
301 PM EDT Wed Aug 9 2017 Area still under the influence of departing high pressure sprawled across the Ohio Valley. Light southerly flow will help temps reach the low to mid 80s.
A head of the system dewpoints have climbed into the low to mid 60s, but temperatures remain cool due to earlier clouds/pcpn. As the llj shifts east, the highest 0-1km shear will transition into MN.
255 PM MDT Wed Aug 9 2017 A series of cool low pressure troughs moving across the Pacific Northwest, the Northern Rockies and Southern Canada will converge with warmer moist southwest flow on the west side of a flat high pressure ridge over the Desert Southwest and Great Basin, over Wyoming.
The main trough and associated surface front are expected to come through late afternoon into the evening, which is good timing for additional convective development in southern Wisconsin. close to where the cold front should be at that time.
517 PM CDT Wed Aug 9 2017 A cold front is currently located just to the northwest of the CWA. Later Thursday afternoon, another cluster of thunderstorms is expected to develop over the High Plains, mainly affecting the southwestern half of the CWA into the evening and overnight.
315 PM EDT Wed Aug 9 2017 High pressure will move east of Pennsylvania on Thursday, starting a moderating temperature trend with slowly increasing moisture.
311 PM EDT Wed Aug 9 2017 Generally fair weather will continue through tomorrow under high pressure. Period will be quiet under high pressure.
A better chance for showers and storms will come across southern Wisconsin by Thursday afternoon as low pressure and an associated cold front move into the area. The upper trough currently over srn Saskatchewan, Canada will dig sewd to MN by 12z. In the lower levels a 25-30 kt swly LLJ will develop providing warm advection and moisture transport. In addition there is a left front quad of the upper jet rounding base of mid/upper level trough that could add a little more punch should that instability reload. Any storms could linger into Thursday evening before cold front and influence of mid level wave shift off to the east.
Isolated convection already developing in area of weak trough and residual moisture along the southern Idaho border. There is also a trough sliding along the Divide that will support additional thunderstorms over the Central Mountains, Arco Desert, and areas along the Idaho and Montana border. The low near the California coast appears to weaken and begin to be absorbed into the flow on Thursday. At the same time, a strong spoke of energy associated with the low near the Aleutian Islands advances towards the Pacific Northwest Coast, nudging the high pressure ridge inland over British Columbia.
309 PM EDT Wed Aug 9 2017 A dry night is expected with exiting high pressure.
313 PM EDT Wed Aug 9 2017 High pressure will remain over the region overnight. A weak trough of low pressure will move across the eastern sections of the forecast area on Thursday.
/issued 333 AM EDT Wed Aug 9 2017/ High pressure over the Western Atlantic waters will weaken through tonight, as a mid to upper level trough of low pressure moves west northwest from the Southern Bahamas and into South Florida. The mid to upper level trough of low pressure will continue to move west northwest into the Gulf of Mexico late this week, allowing for high pressure to build back into South Florida.
With upper low tracking across the northern fa cannot rule out funnel cloud development across the region this afternoon. Other area of showers and a few t-storms east of the upper low now northwest of Minot. The warm advection precip will slowly move east and then will see redevelopment over E ND east of the upper low during the day/eve. Showers and t-storms east of the upper low will spread slowly into DVL region this morning and gradually thru the fcst area later today/this evening. Upper low associated with Wednesday system moves into northwest WI during day Thursday.
123 PM MDT Wed Aug 9 2017 West to NW flow aloft continues over the region with high pressure to the south and a deep trough over the Great Lakes. Specific humidity values for this afternoon and evening will increase over the higher terrain and along the south of the Palmer Divide. this will interact with a stalled cold front over the eastern CO border with moderately moist ESE flow. West-northwesterly flow aloft will continue through the weekend as upper troughing remains over the upper Midwest and high pressure remains over Texas.
259 PM CDT Wed Aug 9 2017 18Z surface data has high pressure over the Great Lakes. A cold front ran from the eastern Dakotas into western Nebraska. Attention then turns to the next cold front. Lows tonight will likely be cooler than expected due to the dry ground. Thursday afternoon, the cold front moves through the area. Thursday Evening and Night Thunderstorm Chances: A cold front and scattered showers and thunderstorms will be moving through the SE half of the forecast area during the late evening and early nighttime period.
Showers and thunderstorms are expected ahead of a cold front Thursday night.
307 PM EDT Wed Aug 9 2017 High pressure will continue to provide mainly clear skies, light winds, and seasonable temperatures into tonight and Thursday.
210 PM CDT Wed Aug 9 2017 High pressure will gradually move east of the region tonight through Thursday. However an extension of the ridge will continue to extend SW across the area, along with a persistent wedge of drier air overhead.
High pressure over the region will provide one more dry and seasonable day.
316 PM EDT Wed Aug 9 2017 High pressure pushes east tonight. An area of high pressure, currently over the region, will push east tonight and as it does, moisture in the form of clouds will being to push north into the area. There no doubt that the area will be in the warm sector of an approaching cold front.
An even higher chance of storms returns late tomorrow afternoon or tomorrow evening as a storm complex is expected to develop in southern Kansas or near the Oklahoma border and moving south/southeast through the area with the highest precipitation chances northeast.
110 PM EDT Wed Aug 9 2017 High pressure over the Ohio Valley will continue to provide fair weather across our area today and tonight as it moves slowly east. Showers are possible across the area Thursday night as a cold front approaches.
120 PM EDT Wed Aug 9 2017 Building high pressure will provide dry weather into Thursday, with a chance of rain extending through the weekend.
Upper low will continue to propagate east along the international border region. Impulses rotating around the low will provide upper support for convection to continue into the evening hours. Probably more likely will be funnel clouds associated with upper low. Guidance indicating that convection should weaken with loss of heating however with upper low in the vicinity showers may linger overnight and have pops going accordingly. Lingering pops warranted across most of the fa tomorrow until upper low exits the region. With cooler column in place temperatures will hold mainly in the upper 60s to mid 70s depending on degree of solar. By Thursday night, clouds will be clearing from northwest to southeast as high pressure moves in from Manitoba.
225 PM CDT Wed Aug 9 2017 Weak upper level ridging continues over Arizona, New Mexico, and southwest Texas with westerly flow aloft. Rain and storms this afternoon and evening should mostly be confined to the higher terrain where the low-level moisture and upslope flow combine. Temperatures today will be warmer than yesterday with southerly winds and more sunshine. The upper ridge becomes more centered over the CWA on Thursday further reducing chances of storms except maybe an isolated storm or two across the higher terrain.
221 PM MDT Wed Aug 9 2017 Broad upper trough persists across the western CONUS with upper ridging centered over the western Pacific coast.
307 PM CDT Wed Aug 9 2017 (Tonight and Thursday) Upper level ridging centered over the Desert Southwest will expand further eastward across west Texas tonight and tomorrow. Overnight lows will generally be in the lower 70s.
In the middle and upper levels (700-200 mb), latest available visible satellite imagery overlaid with model streamline analysis as of 200 pm depicts the center of elongated east to west oriented ridging positioned over West Texas, with the eastern periphery of the deep and warm ridging poking across the breadth of the Gulf of Mexico to over Central Florida. Immediately to the southeast of that feature, an upper low is now near Jamaica but moving southwest as its associated northern axis continuing to stretch out across Cuba and the Bahamas. And closer to the Keys, a low level trough is moving slowly westward across the Central and Northwestern Bahamas. The surface/low level trough near the Bahamas will slide westward by later tonight and move slowly across the area during Thursday and Thursday night.
657 PM EDT Wed Aug 9 2017 High pressure will remain over the region overnight. A weak trough of low pressure will move across the eastern sections of the forecast area on Thursday.
Thunderstorms are beginning to develop this afternoon with most of the activity currently in the high terrain of the southern Bitterroot Mountains and east into the Beaverhead-Deerlodge NF. Moisture is forecast to move into the region as the ridge of high pressure begins moving east.
With the upper-level ridge remaining to the west and the long-wave upper trough to the east, Northeast Montana will continue the northwest flow aloft pattern of late. Thus cooler than normal highs will continue through the short-term period. Eastern zones will be cooler than western zones. There will be lingering showers behind the low that may affect our far eastern zones with intermittent light rain and thunder, but more likely not.
Overnight into early Thursday, areas of low clouds and fog could develop over parts of the area, particularly through the lower Arkansas River Valley.
Slight change in the longwave pattern this weekend as an upper trough/low drop south from the Gulf of AK sweeping into the Pac NW. Given the cooler air aloft it may allow for mixing out of the marine layer. SFO Bridge Approach. As high pressure builds over the Eastern Pacific northerly winds will begin to gradually increase this afternoon over the coastal waters.
244 PM EDT Wed Aug 9 2017 High pressure will crest over the region this afternoon and tonight before shifting off the coast on Thursday.
148 PM EDT Wed Aug 9 2017 High pressure will build in today, then pass east on Thursday.
218 PM EDT Wed Aug 9 2017 High pressure will move east of Pennsylvania on Thursday, starting a moderating temperature trend with slowly increasing moisture.
638 PM EDT Wed Aug 9 2017 A dry night is expected with exiting high pressure.
The upper low remains just off the coast of northern CA. this low is forecast to move inland tonight. A weak ridge of high pressure will likely persist over southern CA, while a weak trough will prevail over mainly northern CA.
317 PM EDT Wed Aug 9 2017 High pressure offshore will continue to move east tonight. Low pressure will move north of the region this weekend.
115 PM PDT Wed Aug 9 2017 Low pressure over northern California will continue shower and thunderstorms development through this evening with some storms capable of producing flash flooding mainly north of I-80. The storm threat will shift farther north on Thursday as this low finally exits northern California.
145 PM EDT Wed Aug 9 2017 Generally fair weather will continue through tomorrow under high pressure. Period will be quiet under high pressure.
Coverage should retreat southward more significantly on Thursday as the upper ridge axis expands southeast over Central TX. This should correct closer to blended guidances for Thursday as the upper ridge strengthens over TX and ground moisture continues to escape into the atmosphere.
407 PM CDT Wed Aug 9 2017 Latest upper air analysis revealed a broad weak trough from the Eastern Seaboard to Lower Mississippi Valley, high over southern New Mexico, deep low associated with Franklin over Bay of Campeche and retreating ridge axis over Florida/west Atlantic. With the breakdown of the col and main broad trough sinking south over the last two days, flow was generally southwest to west from 700mb to 200mb over the forecast area. 18 The trough axis weakens and moisture axis will become more diffuse but pw values remain elevated through the remainder of the week and through the weekend. However, mid layer warming will remain west close to the ridge and convection will have no problem developing with surface heating each day.
333 PM EDT Wed Aug 9 2017 A cold front will weaken over the area tonight. High pressure builds into the area tonight. On Thur some models indicate that showers may fall in wrn zones in the aftn courtesy of a subtle s/wv ejecting fm the Great Lks along with upslope flow against the higher terrain.
1251 PM CDT Wed Aug 9 2017 High pressure was located over northern Illinois early this morning. Dry weather is expected through this evening as a retreating high will keep the low levels dry. A long wave trof of low pressure will remain in place over eastern North America with west-northwest flow aloft over the Midwest.
This pattern, with a lingering upper level low pressure off of the northern California coast, continues to support a relatively deep marine layer over the region. Overall, little change is forecast today with temperatures near to slightly warmer than those yesterday across the interior as high pressure strengthens over the Desert Southwest and allows temperatures aloft to warm a bit. The blocking pattern aloft is forecast to break down by the upcoming weekend as a more organized mid/upper level trough drops out of the Gulf of Alaska toward the Pacific Northwest. With that, some locations near the coast may actually see daytime temperatures trend warmer while inland areas experience a cooling trend. SFO Bridge Approach. As high pressure builds over the Eastern Pacific northerly winds will begin to gradually increase this afternoon over the coastal waters.
215 PM EDT Wed Aug 9 2017 Weak high pressure will build into our region from the north through tonight.