Aikyam-Lab/Synoptic-Bench huggingface dataset:
807 PM CST Sat Feb 25 2017 Little change to the forecast for tonight as a high pressure system centered over AR/W TN slowly advects east towards the TN Valley underneath a dry and subsident regime. A clear sky will dominate with a cool northwesterly wind of 5-10 MPH until early Sunday morning, when the high pressure center arrives over central TN/N AL --relaxing the pressure gradient. Due to the incipient calm winds and clear sky, radiational cooling should result in overnight lows dropping below freezing. Temperatures are already in the 30s across portions of southern middle TN while the rest of the area remains in the low 40s. A rather weak trough will begin to move into the Central Plains and upper level flow will take on a more southwesterly component by the afternoon.
753 PM EST Sat Feb 25 2017 Showers end this evening as a cold front moves off the coast.
Cooler Sunday Behind Front. Cold front and associated northerly wind surge (18- 22KT) will push south down the waters overnight and veer to NE on Sunday.
Southwest or south surface winds this evening generally at or below 15 kt expected until weak cold front causes shift to northwest.
925 PM EST Sat Feb 25 2017 In the wake of an upper level disturbance, high pressure will build in the midwest and settle south of the Ohio Valley tonight.
915 PM EST Sat Feb 25 2017 Showers end as a cold front moves off the coast.
512 PM CST Sat Feb 25 2017 Upper trough crossing the Northern Plains will bring a limited chance for very light precipitation into the evening hours across the highway 14 corridor. The aforementioned trough will move east of the area by Sunday morning, leaving a poorly defined frontal boundary across the CWA. The impact of snow cover has been marginal today, and would expect that to be the case again on Sunday, but will again hold temperatures a couple degrees cooler in the deeper snow pack areas. Sunday night will transition from a west-northwest flow aloft to a southwesterly flow as a Pacific trough digs into the Northwestern US.
353 PM MST Sat Feb 25 2017 Strong west-southwest jet level flow ahead of a weak upper-level trough just about to move over western Colorado will pass over the forecast area overnight. The strong nearly zonal flow aloft will combine with a low amplitude mtn wave and a sfc lee trough to produce gusty westerly surface winds in the mountains and on the adjacent high plains until around midnight tonight. This area of showers, mainly in the form of snow, is projected to track east-southeast with the trough, clipping the southwest quadrant of the CWA over the next several hours. Most of this precip should wrap up not long after midnight with drier and more stable air moving in behind the trough. drier and slightly warmer air will spread over the forecast area with the upper-level trough exiting the state by around midday.
Cold front pushing south of TN and is now moving through the deep south.
301 PM MST Thu Dec 22 2016 The early afternoon water vapor loop depicted a large mid-level moisture plume spreading northeast across the Four Corners and into Wyoming and the high plains. 12Z short range model guidance is in good agreement progging the southern CA upper low to transition to an open wave and accelerate northeast across the Four Corners late this evening and Great Plains Friday morning.
A warm front south of the terminals will lift north through tonight leading to IFR-LIFR cigs and MVFR-IFR VIS due to fog. Have added this precip mention with this TAF package, and tried to show the best time when the low clouds, fog and drizzle will begin. /issued 355 PM CST Thu Dec 22 2016/ The weak cold front that moved through earlier today is now well south of the area. temperatures were similar to or only slightly cooler than those of yesterday. starting with a warm front lifting across the region on Friday.
As cut-off wave opens and advances into the Midwest, critical thicknesses and temperature rises here indicate surface air temperatures to reach above freezing before initial wave of rain sprinkles arrive Friday afternoon. Friday night temperatures stay above freezing and thus precipitation to remain as rain.
Precipitation looks to fall as mostly rain this afternoon with an occasional mix of snow or freezing drizzle. Freezing drizzle or snow will be possible this evening through around midnight, otherwise expect mostly cloudy skies. Winds will generally be from a southerly direction through tonight as a dome of high pressure shifts eastward with a trough of low pressure setting up across eastern Colorado. Winds are expected to shift to a northerly direction tomorrow as a weak cold front slides through the area. As for temperatures, lows tonight look to dip to around freezing with highs tomorrow reaching to the low 50s to around 50 degrees.
821 PM EST Thu Dec 22 2016 High pressure builds into tonight and Friday.
Temperatures are expected to stay above freezing but will need to be monitored overnight. Lows tonight will be from the lower 40s west to mid to lower 30s east.
High pressure will then bring fair and seasonably chilly conditions Friday.
859 PM EST Thu Dec 22 2016 High clouds will gradually increase tonight which should limit temperatures from dropping much below the lower 20s.
Dewpoints have risen near the coast as flow turns onshore above the boundary layer so it will not be as cool as last night with lows in the lower to mid 60s south of the Cape. This configuration will push an H100-H70 anticyclone over the nation's midsection rapidly east thru the pd. Center of the ridge fcst to reach the Mid Atlc states by daybreak Fri, then into the W Atlc by 00Z Sat while simultaneously merging with a weaker anticyclone over the GOMex. The net result will be an overall stable airmass and a rapid wind shift from north to east as the two anticyclones bridge an increasingly diffuse cold front pushing into the Deep South. Inverted trough will wash out overnight as high pressure builds across the state.
935 PM EST Thu Dec 22 2016 A cold front will move offshore tonight. High pressure will then build in on Friday before quickly moving offshore Friday night.
Surface analysis this afternoon places a cold front from the Appalachians back through Southern Alabama, Mississippi, and Louisiana. Meanwhile, a 1031 mb ridge of high pressure is located over Kansas and Missouri, and extending into portions of the Southern Plains and Lower Mississippi Valley. The aforementioned cold front along the northern Gulf Coast will begin to move back north as a warm front on Friday and into the Mid- South Friday afternoon into Friday evening.
The cold front can be seen in the radar data this afternoon approaching HWY 190.
Overnight lows will be a couple of degrees warmer than the previous night, low to mid 60s over northern and interior areas, and in the mid to upper 60s to low 70s around the metro areas and coastal locations.
However, cloud decks and visibilities will gradually lower throughout the evening and overnight hours into tomorrow morning as isentropic ascent and significant moisture advection occurs as this morning's cold front moves north as a warm front. MVFR conditions will return at DRT by 19Z once the warm front moves north, while this should not occur at the I-35 sites until later in the afternoon. A cold front is over Southern Texas while an upper level trough is over Western Arizona/Sonora state of Mexico.
Marine/advection fog has formed over portions of the Laguna Madre and the Nearshore Gulf waters in association with a weak cold front and warm dew point air flowing over slightly cooler coastal waters. A weak cold front has passed south of all TAF locations with Northeast winds expected through the evening. Signs point to another round of dense fog for the lower valley as a weak front essentially stalls over the area, and the location of the boundary will impact fog development. The HRRR shows persistent dew points in the mid to upper 60s and very light winds for the lower valley tonight, supporting heavier fog formation. Southeast winds should reestablish themselves during the day Friday as high pressure shifts east and pressures fall across the high plains ahead of a short wave trough.
Radar echoes across Missouri this evening indicate some mid-level precip, but the low levels are extremely dry. Most of the model guidance, especially recent runs of the hrrr, gradually moisten the lower levels enough for measurable precip by 12z.
Will monitor for any freezing rain reports, as it doesn't take much to cause problems. Precipitation looks to fall as mostly rain this afternoon with an occasional mix of snow or freezing drizzle. Freezing drizzle or snow will be possible this evening through around midnight, otherwise expect mostly cloudy skies. Winds will generally be from a southerly direction through tonight as a dome of high pressure shifts eastward with a trough of low pressure setting up across eastern Colorado. Winds are expected to shift to a northerly direction tomorrow as a weak cold front slides through the area. As for temperatures, lows tonight look to dip to around freezing with highs tomorrow reaching to the low 50s to around 50 degrees.
/issued 305 PM CST Thu Dec 22 2016/ Surface analysis this afternoon places a cold front from the Appalachians back through Southern Alabama, Mississippi, and Louisiana. Meanwhile, a 1031 mb ridge of high pressure is located over Kansas and Missouri, and extending into portions of the Southern Plains and Lower Mississippi Valley. The aforementioned cold front along the northern Gulf Coast will begin to move back north as a warm front on Friday and into the Mid- South Friday afternoon into Friday evening.
819 PM EST Thu Dec 22 2016 Weak cold front sinking southward into the CWA at this hour. A cold front located northwest of the area will move in overnight.
927 PM EST Thu Dec 22 2016 High pressure will provide sunny and mild conditions for Friday.
Strong LLJ will pull moisture into the region ahead of ejecting upper low. While most of the precip will fall as snow, some freezing drizzle is possible during the evening as the deep moisture is stripped out behind the system. Precipitation is expected to change to a wintry mix and then to a brief period of freezing rain or freezing drizzle before ending around midnight.
Some more sheltered spots could see less wind and therefore a little cooler temps (much like last night). and a cold front moving into the area from the north late in the afternoon on Friday. leading to drizzle or freezing drizzle.
freezing rain or even snow remains possible. with some warm air intrusion aloft resulting in a switch to potentially some light freezing rain during the overnight through early morning hours Friday. with lows possibly not dipping below freezing in many spots. snow and freezing rain through the morning hours tomorrow.
634 PM EST Thu Dec 22 2016 A dry cold front will track southward across the forecast area tonight. High pressure will then build in on Friday before quickly moving offshore Friday night.
/issued 251 PM CST Thu Dec 22 2016/ Temperatures this afternoon are significantly cooler than yesterday due to last night's cold front, with highs expected to top out in the upper 40s and 50s across most of the area, with 60s possible across far southern zones. The low pressure system that had been off of the Baja Peninsula the past few days has begun to open up and lift northeast, currently moving toward the Four Corners Region. Rain may briefly transition to freezing rain late tonight across northern Lea county where temperatures will drop to just below freezing. On Friday, the low will lift into the Central Plains, and moisture over the area will begin to decrease. Temperatures Friday will rebound back above normal as return flow develops, with highs around 60 degrees north to the lower 70s through the Rio Grande Valley.
This could lead to freezing sprinkles, sleet and/or flurries or sprinkles with surface temperatures near freezing. The final caveat is the potentially cold ground that could support freezing of supercooled liquid.
450 PM MST Thu Dec 22 2016 The early afternoon water vapor loop depicted a large mid-level moisture plume spreading northeast across the Four Corners and into Wyoming and the high plains. 12Z short range model guidance is in good agreement progging the southern CA upper low to transition to an open wave and accelerate northeast across the Four Corners late this evening and Great Plains Friday morning.
High pressure just to the west this afternoon has kept the westerly winds over the region and mostly sunny skies in the region tonight. Overnight, the winds will start to shift to more southwesterly and lighten as the ridge axis moves through ahead of the next storm. With the significant warming across the region today, short term guidance has come in a few degrees warmer with the overnight lows. Ceilings slowly coming down tomorrow between 12Z and 18Z as the surface trof approaches.
702 PM EST Thu Dec 22 2016 A weak and dry cold front will move through the forecast area this evening. High pressure behind the front will build north of the forecast area tonight.
Chattanooga Airport, TN 32 56 46 58 / 0 0 40 50 Knoxville McGhee Tyson Airport, TN 30 55 43 55 / 0 0 60 80 Oak Ridge, TN 29 54 43 52 / 0 10 70 90 Tri Cities Airport, TN 25 54 38 53 / 0 0 70 80.
548 PM CST Thu Dec 22 2016 High pressure just to the west this afternoon has kept the westerly winds over the region and mostly sunny skies in the region tonight. Overnight, the winds will start to shift to more southwesterly and lighten as the ridge axis moves through ahead of the next storm. With the significant warming across the region today, short term guidance has come in a few degrees warmer with the overnight lows. Ceilings slowly coming down tomorrow between 12Z and 18Z as the surface trof approaches.
Cold front now over Ga will push se across the area tonight. Isolated coastal showers will be possible during the afternoon with cooler temperatures due to winds off the Atlantic waters. Clouds at 5 to 7 kft associated with cold frontal boundary will push across the area tonight.
Upper level analysis places flat ridge over the area resulting in seasonably pleasant conditions. Ominous low pressure wave which will bring the weekend storm looms about 1000 miles off the Oregon coast. quiet weather continues as upper ridge remains in place. This will also result in temperatures being a bit cooler. Upper low over the Pacific continues its approach and deepens.
Temperatures are warm enough now that the entire forecast area is at or above freezing at this point (20Z). This will help keep our chances for snow limited as the lower levels are forecast to stay above freezing for a good portions of the next 24 hours.
While the snowfall will be the primary impact from this system, there remains at least a chance there could be a brief window for freezing drizzle Friday evening as the deeper saturation exits.
and a cold front moving into the area from the north late in the afternoon on Friday. leading to drizzle or freezing drizzle.
Until most of the column is saturated (yielding snow p-type) Friday morning, there is the potential for p-type to be liquid reaching a sub-freezing ground (yielding freezing rain p-type). Low end chances for some freezing rain late tonight mainly along and south of a line from Kennebec to Britton transitioning to some low end chances for light snow east of a line from Redfield to Britton on Friday. Before the storm we will see some colder air nose into the CWA from the north, so will start with sub freezing surface temperatures.
Temperatures are in the lower to mid 70s. In the low levels of the atmosphere, an area of high pressure will progress eastward across the Ohio Valley overnight. In the mid levels of the atmosphere, an anticyclone will be centered over the western Gulf of Mexico tonight. In the upper levels of the atmosphere, an area of high pressure will be located over the southwest Gulf of Mexico overnight.
an upper low was currently lifting out of the Northern Baja of California and entering into far Southwest Arizona within upper level near zonal flow. This resulted in high level clouds associated with the upper low to spread across Eastern Oklahoma and Northwest Arkansas. Moisture aloft moving into the region within the high level cloud layer was producing radar echoes over parts of Oklahoma and Kansas. Areas of light drizzle and or light rain will become possible late overnight as the upper low approaches. The CWA become nearly saturated during the morning hours Friday which will increase rain chances over the region as the upper low moves into the region.
A weak cold front has passed south of all TAF locations with Northeast winds expected through the evening. Signs point to another round of dense fog for the lower valley as a weak front essentially stalls over the area, and the location of the boundary will impact fog development. The HRRR shows persistent dew points in the mid to upper 60s and very light winds for the lower valley tonight, supporting heavier fog formation. Southeast winds should reestablish themselves during the day Friday as high pressure shifts east and pressures fall across the high plains ahead of a short wave trough.
Additionally, we are not seeing enough saturation in the low levels to support a drizzle threat. Otherwise, pockets of light snow, freezing rain, and plain rain will be possible. Temperatures will warm up enough for all rain by mid-morning on Friday with afternoon highs in the lower to middle 40s.
The northern edge of the lower clouds was just north of I-85 this afternoon, and it will continue to shift southward through the evening hours as drier air advects southward behind a cold front.
255 AM EDT THU JUL 21 2016 High pressure over the eastern Great Lakes will build southeast across Pennsylvania tonight, and then off the Mid Atlantic coast Thursday and Friday.
500 mb heights will reach their peak during the day, and with still low dewpoints and dry soil, today will likely feature the highest temperatures out of the next several days.
222 AM EDT THU JUL 21 2016 High pressure builds over the region through tonight then remains in place through the weekend. Weak high pressure is moving over the Mid-Atlantic states tonight as the upper trough off the New England coast exits and the large ridge over the central US builds eastward. Some low stratus is possible early Thursday morning along the lower Bay with some patchy fog inland. Anomalous upper ridge over the nation's mid section continues to build eastward Thursday and Friday. The upper ridge expands eastward Friday, reaching the Piedmont. Pressure falls along the lee side of the mountains will sharpen a thermal trough over the Piedmont, but a lack of moisture and appreciable forcing results in silent POPs.
352 AM EDT THU JUL 21 2016 High pressure will remain in control of our weather today. The main upper level ridge will shift slightly more to our west tonight. This will allow the low level winds to turn towards the southwest on Friday, ushering in higher moisture. A wave in the upper level flow is progged to drop southeast around the ridge towards our area late Friday afternoon, bringing shower and thunderstorm chances back into the forecast.
605 AM EDT THU JUL 21 2016 Aviation A high pressure system centered over the Central Appalachians will continue to generate a southwest flow here in Michigan into Friday. A relatively weak cold front will slip down from the Northwest on Friday. Will keep the high pops going for tonight.
CWA remains on the eastern side of an upper level ridge to the west with a trough along the eastern U.
1129 PM MDT WED JUL 20 2016 mean central conus ridge will remain in place in the period as a ridge topping impulse advects on its northern periphery. Slightly cooler conds can be expected as the thermal ridge shifts east, with 90s most places and a few 100s on the SD plains. The low deepens considerably during the day, and by 00z is down to 997mb in Southeast Montana.
Based on latest forecast heat indices, can't justify it, especially over the northern zones where some drier air will allow for a cooler night and then not as high of heat index on Friday. As for pcpn chances, Friday night is the best opportunity as a decent front crosses the region, along with falling heights aloft as mid level trof moves along the US/Canadian border.
Upper level high pressure continues to dominate at this time.
354 AM MDT Thu Jul 21 2016 Warm and dry high pressure is building over the Northern Rockies today which will lead to potentially the warmest July day so far this year. However, cooler temperatures (around normal) are anticipated to return.
dry and breezy conditions will persist today as we remain in Southwest flow ahead of a Upper Level Low and associated dry cold front off the Pacific coast. Friday look for moderate to strong winds particularly over our Northern and Central areas as a dry cold front passes through the area.
1223 AM CDT THU JUL 21 2016 Elevated convection continues to bubble across west central Wisconsin within the broad synoptic scale warm frontal zone this afternoon.
Good agreement in model solutions in regards to strength and location of upper ridge that has dominated the forecast lately. Close to a carbon copy temperature wise across the forecast area today, with some sites in northern Arkansas a degree or two warmer. Slightly better rain chances on Friday, mainly across southeastern areas during the afternoon and evening hours as a weak disturbance rounds the eastern edge of the upper ridge.
254 AM CDT THU JUL 21 2016 The center of the upper level high pressure system is found from the Texas Panhandle into south central Kansas this morning. This high should keep any shower and thunderstorm activity to our west again today. The northwest edge of the upper level ridge will break down some on Friday.
/issued 940 PM CDT WED JUL 20 2016/ Wx map continues to show high pressure at the surface over the S and SE U. with high pressure aloft dominating most of the middle of the country. This latter activity associated with disturbances rotating about the periphery of south plains anticyclone. This as high pressure remains ridging across the southeast CONUS and adjacent gulf waters.
High pressure will continue to settle in overhead tonight.
348 AM EDT THU JUL 21 2016 High pressure over West Virginia early this morning will drift eastward off the East Coast today. This will allow a warm front to lift northeastward across the region through this evening. A weak cold front will sag southward across the central Great Lakes Friday night.
High pressure ridge continues to build just NW of the region and this will keep a E/NE steering flow over the region which will favor the East Coast Sea Breeze front to push well inland during the afternoon and evening hours. Dewpoints into the lower to middle 90s will continue to support Heat Indices around 105 degrees during the afternoon hours but still short of advisory criteria. Temps still slightly above climo values in the lower/middle 70s inland and upper 70s/near 80 along the coast. An unstable and moist airmass in place in advance of this feature should be good enough for scattered thunderstorms, primarily west of I-95 with the highest chances across the interior of Northeast Florida later in the afternoon as the upper level energy interacts with the Atlantic seabreeze to spark convection.
The chances are relatively small, but being closer to the peak of the ridge, each weak disturbance moving around the ridge could spark a few showers and thunderstorms moving in off the high plains. The ridge flattens out as the weekend approaches and a front is expected to slide slowly east across Nebraska.
1119 PM MDT WED JUL 20 2016 Tonight the upper level ridge wl be centered over the south central KS border, and wl shift a little westward on Thu. High temps on Thu should generally be around average in the high valleys with reading in the 80s, and above average temps acrs the sern plains, with readings in the 90's to lower 100's. high pressure over the central plains will force monsoonal moisture northward out of the desert southwest. The upper level pattern will continue on Friday with high pressure over the central plains and monsoonal moisture lifting northward out of the desert southwest.