Aikyam-Lab/Synoptic-Bench huggingface dataset:
Surface and upper ridging will produce another dry and mild day across the Tennessee Valley and southern Appalachians. Main concern today will be the low afternoon relative humidities. An upper low over the mid-section of the nation will move slowly toward the Ohio Valley with increasing southwesterly boundary layer flow. The southwest flow will increase the isentropic lift over a warm front boundary and spread moisture back into the region. The surface warm front will move across the Plateau and southeast Tennessee Saturday morning with enough elevated instability to include a chance of thunderstorms. Warm front will continue to lift northeast across the regon with showers and elevated thunderstorms likely for the first half of the day. However, as the upper trough moves toward the east Ohio and northern Tennessee Valleys late afternoon and evening, scattered showers and storms will redevelop.
High pressure will build across the Upper Great Lakes region today and linger through tonight. High pressure will remain over the Upper Great Lakes through Saturday.
258 AM CDT Fri Mar 16 2018 An area of high pressure will be over the Northland today into Saturday keeping the region dry under mostly clear skies. Today will be sunny as a ridge over the Northland keeps the affects of a storm system well to the south/west over the Central/Northern Plains. Highs today will be warmer than yesterday and range from the mid thirties to lower forties. A light onshore flow will keep lakeside areas a bit cooler.
413 AM EDT Fri Mar 16 2018 A dry cold front near the south coast will move to the south today and become stationary. Weak low pressure will move through late Saturday, pulling the front back north as a warm front.
to the 50s east where southerly flow persists on the east side of the low. Precipitation is starting to fill in over the CWA as the low complex continues trek east-northeastward. amplified H5 ridge building/moving over the Plains region will provide dry conditions before the next round of precip affects the region.
130 AM EDT Fri Mar 16 2018 A backdoor cold front will push south into central NC overnight, then stall in our vicinity through Saturday. An area of low pressure will cross the area Saturday night, dragging the front southward.
With the boundary layer winds diminishing tonight and surface moisture on the high side, am expecting to see some patchy/areas of fog most areas.
Another rather weak sfc and upper level trough will move southeast from the Lower Great Lakes late tonight and help to maintain sct-bkn high-based stratocu and altocu across the southeast half of the CWA, while a lower bkn-ovc layer of strato cu and occasional snow showers impacts the northern and western mountains with light additional accumulation as vsbys briefly dip to between 1 and 2 miles in the heavier snow showers. The first will be a closed upper level low which will open up into a trough as it moves into the mid atlantic Saturday afternoon.
Broad troughiness remains over the western part of the United States with the main low pressure system coming on shore near the California/Oregon boarder. The position of this low is causing weak southerly flow over the Northern Rockies.
300 AM CDT Fri Mar 16 2018 A strong low pressure system will be moving through the northwest portions of the State today. By Saturday, the cold front will be moving through and will kick the flow around to the north.
Temperatures at the surface are around or even a little above freezing depending on location. Otherwise, freezing rain and snow are expected at times through the day, with steadiest precipitation rates late this morning into this afternoon for the southeast zones, and this evening for the northwest zones. This, combined with a trace to a few hundredths of an inch of icing potential in freezing rain, is reason enough to maintain the headlines in place. Tonight, as main precipitation lifts north, looking at the potential for lingering freezing drizzle.
On Saturday, a cold front will drop down from the north and stall over or just north of our CWA bringing better chances for rain and isolated thunderstorms, especially for our SE AL and GA zones.
145 AM EDT Fri Mar 16 2018 A trough of low pressure will linger across the eastern Great Lakes through Friday. High pressure will settle over the area Friday night through the weekend while low pressure tracks up the Lower Ohio Valley Saturday.
223 AM EDT Fri Mar 16 2018 A cold front approaching from the north will stall near the north part of the forecast area tonight.
859 AM EDT Fri Oct 27 2017 High pressure will be Northeast of the region this afternoon, leading to onshore flow.
Latest sfc analysis places the cold front across central IN southwest through srn IL and nrn AR. At any rate, look for the cold frontal boundary to reach our extreme northwest just before midday, Nashville around 4 pm, and then the Plateau around 9 pm.
1004 AM CDT Fri Oct 27 2017 Cold front continues to shift across southeast TX this morning, moving into the coastal counties by 15z.
LAPS data shows the approaching cold front to be around Louisville. Exception to this might be CKV where building sfc ridging influences could result in bkn/ovc stratus/alto stratus VFR ceilings 28/08Z-28/12Z.
The low temperature at DIA got down to 13 F this morning, only 2 degrees shy of record low for the date. A little leftover moisture in the northerly flow will allow for isolated light snow showers over the northern mountains Saturday morning and afternoon before upper ridging dries the weather out.
After another cool start early this morning the east southeast wind flow and sunshine will allow temperatures to moderate back to seasonal levels during the afternoon with highs topping out in the lower 80s.
May be a few virga flurries out there this morning, but mostly expecting a mostly cloudy sky becoming partly cloudy with slightly warmer temperatures compared with yesterday. BMickelson Mostly clear and cold this morning with high pressure over eastern Montana. Upper ridge along the west coast spilling moisture across the Canadian prairies with northerly flow and high clouds beginning to reach into the northern zones. Cloud cover will continue to increase today while ridge slowly nudges eastward. Saturday temperatures will also be influenced by downslope flow and compressional heating in advance of the cold front.
Chattanooga Airport, TN 70 50 54 36 / 10 90 90 10 Knoxville McGhee Tyson Airport, TN 71 50 55 37 / 10 60 90 30 Oak Ridge, TN 71 50 54 36 / 10 80 90 30 Tri Cities Airport, TN 71 47 56 35 / 0 20 90 80 TN.
615 AM CDT Fri Oct 27 2017 Colder, below normal temperatures will continue to move into the region as high pressure builds. Winds will be much lower today as the positively tilted trough continues to move away from the region. All areas of the CWA will experience freezing temperatures Friday night and into Saturday morning. Saturday will be a little warmer as the winds will be more westerly allowing for some down slope wind.
591 DM upper high centered off the Oregon coast will be the main synoptic feature to influence our weather over the weekend. High weakens to upper ridge Saturday.
955 AM EDT Fri Oct 27 2017 Low level flow veering more easterly today with high pressure to the north drifting east from the mid Atlantic coast. The clouds may damper heating just a bit near the east coast, but still expect the highs to reach mid-upper 70s coast and around 80 inland. An early morning coastal trough causing a light northerly wind flow will dissipate by midday and then high pressure centered along the mid Atlantic coast will produce an east wind flow at 10-12 knots. The high will shift a little seaward tonight which will cause winds to veer to a southeast-south direction with speeds less than 15 knots.
519 AM MDT Fri Oct 27 2017 Current surface analysis shows deep low pressure over northern WI, with high pressure over eastern MT and WY. High pressure to the west will move over and east of the area today, with cool temperatures remaining across the area. Milder conditions, close to average, will return for the weekend as ridge over the west coast nudges eastward.
1020 AM EDT Fri Oct 27 2017 Cool high pressure crossing the region will move offshore. A cold front will cross the area Saturday night bringing a chance of showers.
The significant upper low that brought the strong winds and some of the first snow of the season, albeit only a dusting, is moving slowly away.
Main issue again today will be showers/storms and elevated winds associated with a cold front, expected to pass the area this afternoon. A Canadian cold front is quickly moving south and southeast across North Texas and Arkansas. Aloft a short wave is dropping southeast across the plains helping to amplify the the already in place trough. Instability will be limited, however enough lift will be present to provide a few thunderstorms and scattered to widespread showers as the cold front sweeps through. Tonight along the coast a wind adv may be needed as more mixing is expected near the warmer waters.
/issued 346 AM CDT Fri Oct 27 2017/ Big changes are on the way today as a strong cold front barrels across the Mid-South. Rain chances will end from west to east during the overnight period as the large scale forcing downstream of the trough axis shifts eastward. A few areas may briefly dip down to the freezing mark and patchy frost is possible, but most areas will remain in the mid 30s. The upper- level trough will swing across the Mid-South late Saturday, but will have little moisture to work with.
Winds will increase during the next several hours as the surface pressure gradient tightens up ahead of an approaching cold front. Ceilings and visibilities will drop to MVFR and IFR at KCHA and MVFR at TYS late tonight and early Friday as the cold front approaches.
944 AM PDT Fri Oct 27 2017 The offshore flow and a high will keep temperatures above normal through Saturday, though cooler at the coast with some dense fog possible.
1056 AM MDT Fri Oct 27 2017 Current surface analysis shows deep low pressure over northern WI, with high pressure over eastern MT and WY. High pressure to the west will move over and east of the area today, with cool temperatures remaining across the area. Milder conditions, close to average, will return for the weekend as ridge over the west coast nudges eastward.
Mostly VFR with patchy fog in the lower valleys that will burn off by 17z. A high amplitude ridge along the west coast today will begin to expand eastward on Saturday. The inversion will remain intact through Saturday which will produce patch fog in the morning and hazy conditions in the afternoon for the lower valleys.
1023 AM CDT Fri Oct 27 2017 Strong cold advection is occurring behind the surface cold front which has now moved into south Texas.
High pressure centered along the Pacific Coast will maintain a dry northerly flow across the Great Basin through the weekend. Seasonal temperatures today will give way to a gradual warming trend over the weekend as this high nudges eastward. The ridge of high pressure remains positioned over the Pacific Northwest and the departing upper level low is moving into the Great Lakes region, with a strong jet racing south through the Great Plains.
Gusty west winds persist around low pressure in northern WI. The cold front has made it to Lake MI with the dry slot following aloft. The occluded system will gradually shift newd for tnt with the upper trough passage and another cold front passage occurring. Strong cold advection this morning will lessen this afternoon, but high temps will only reach the lower to middle 40s.
The wind decrease is in response to the thermal trough weakening along the coast.
As of 3 AM: Cold and windy across E Iowa/NW Illinois on the backside of an area of low pressure over Wisconsin. And strong west winds of 20-30 mph will create wind chills in the 20s and 30s! Wrap around moisture associated with the low moving through Wisconsin will affect mainly areas along and north of highway 30 in the form of rain and snow showers. Given the two night freeze potential, we've tried hard to collaborate the message that all areas are going to be freezing all night long Saturday night. This will allow temperatures to more or less crash at sunset, with sub-freezing temperatures becoming widespread by 7 PM. Lows in the mid 20s are expected, and with 10 to 14 hours below freezing, this will end any growing season plants, and thankfully, most bugs.
859 AM EDT Fri Oct 27 2017 High pressure into Friday.
919 AM MDT Fri Oct 27 2017 No changes to the short term forecast this morning, with only a little mid and high level cloud in the east along the warm front. Models hint at some precipitation over the southern zones/Big Horns late tonight as a warm front crosses the area. Have included slight chance PoP's for this, mainly over the higher terrain as we may only see sprinkles or virga at the lower elevations.
301 AM MST Tue Mar 6 2018 Isolated light snow showers will continue over the highest peaks of the CO northern mountains early this morning then dissipate. A strong ridge will build over the western U.
Locations between Kalispell and Marias Pass will see the higher snow accumulations of a couple inches. A weak ridge of high pressure will build over the region during the day on Wednesday. Where lows will dip into the low single digits, to slightly below zero. Others will be in the low to mid teens across western Montana, and low 20s for the lower valleys of north-central Idaho. One factor that could limit the lowest temperatures, will be the potential for freezing fog. Clouds will increase Wednesday night keeping overnight lows just below freezing.
Low risk for some very spotty mixed precip/freezing rain this morning in the Laurel Highlands, as a bit of warmer air tries to work in aloft. Upper low rotates through the area Thu-Fri combining with seasonably cold westerly flow to prolong snow showers downwind of the lakes and over the favored upslope areas along the Allegheny Plateau. This will support additional snow accumulation through the end of the week across the higher elevations in the Laurel Highlands and northwest Alleghenies. At KMDT, expect cloud deck to be in the low VFR range if it does make it down that far to the south.
Warm and Dry conditions expected today as the upper level ridge develops over the region. Clouds will increase from the southwest later this afternoon and evening in response to the next upper level trough approaching the California Coast.
Satellite and surface observations show clear skies and sunshine already present across the western Cumberland Plateau where the drier air is located with surface dew points in the low to mid 30s compared to the mid 40s ahead of the front at CHA, TYS, and TRI. Chattanooga Airport, TN 65 36 48 31 / 50 10 10 10 Knoxville McGhee Tyson Airport, TN 62 34 45 29 / 80 30 20 10 Oak Ridge, TN 63 34 46 30 / 40 30 20 10 Tri Cities Airport, TN 55 33 44 27 / 70 60 40 20.
629 AM EST Tue Mar 6 2018 A cold front will move into the region from the west today bringing widespread showers.
There should be more sun north of the highway 200 corridor with a little more cloud cover to the south. Skies mainly clear tonight RRV and east, though some cirrus perhaps, and this will allow temps to drop into the lower single digits with the fresh snowcover. Clouds moving east into the DVL basin will keep temps warmer there.
Strong northwest winds will develop by early afternoon as speed max dives south on backside of upper low.
Early morning surface analysis shows a cold front pushing across southeast Louisiana, interior southeast Mississippi and into western and northwestern portions of Alabama. Much cooler tonight with lows in the mid 30s to around 40 inland, and slightly warmer near the beaches.
Continued the Winter Wx Advisory in the eastern and northern portions of the area due to lingering light snow and freezing drizzle. Sfc temps are expected to warm above freezing over all of srn WI by late this morning so impact from the snow will be minimal. Medium Low level thermal trough in place with cyclonic flow.
An area of low pressure moving across the Midwest later today will create gusty west winds across our northwest counties this afternoon, but currently appears winds will remain below our advisory criteria with the stronger winds off to our west and north. As the area of low pressure moves off to the east and an upper trough swings across the area tonight into Wednesday morning, anticipating a band of showers to quickly pass through the region. Although surface temperatures will remain at or above freezing, profiles aloft will be favorable for a mix of rain and snow with these showers, especially in the northern Cumberland Plateau counties.
Upper low rotates through the area Thu-Fri combining with seasonably cold westerly flow to prolong snow showers downwind of the lakes and over the favored upslope areas along the Allegheny Plateau. This will support additional snow accumulation through the end of the week across the higher elevations in the Laurel Highlands and northwest Alleghenies.
Temperatures have come up to within a degree or two on either side of freezing, so impacts from this additional snow should be minimal. Onshore flow north of Milwaukee is keeping waves on the higher side this morning and afternoon.
The reduction in vsbys will be due to light fog and very light snow or freezing drizzle. Continued the Winter Wx Advisory in the eastern and northern portions of the area due to lingering light snow and freezing drizzle. Sfc temps are expected to warm above freezing over all of srn WI by late this morning so impact from the snow will be minimal. Medium Low level thermal trough in place with cyclonic flow.
Despite these high clouds and, likely, due to a dry, easterly wind in the lower levels, temperatures have been able to cool substantially, to frosty values, at many locations along and near the Coos and Curry County coastlines.
439 AM CST Tue Mar 6 2018 For today, a vigorous upper level low pressure system over the midwest states will continue moving east and southeast and further away from the fcst area.
554 AM CST Tue Mar 6 2018 A complicated forecast this morning as a strong low pressure system continues to affect the local area. opted to expand in area and time the high wind warning across the local area. it was very difficult deciding where to cut off the high wind warning as several locations outside of the warning have seen gusts into the mid 50s this morning. think the majority of the strongest winds will now lie in the area with the high wind warning. These lighter winds and clearing skies should allow overnight temperatures tonight to drop into the lower 20s or even teens by late tonight.
412 AM MST Tue Mar 6 2018 Upper level analysis shows closed low over northwestern IA/southwestern MN. A broad trough stretches over the northern plains, and a ridge is building over the west coast. Upper low will swing southeast over IL today, as the upper ridge to the west shifts eastward. As the upper ridge works its way into the central states, quiet weather and a warming trend are expected through the end of the week.
601 AM EST Tue Mar 6 2018 [Through 12z Wednesday] A cold front will bring a round of showers and possibly a few thunderstorms to the region today. The 06z surface analysis showed a cold front stretching from Louisiana northward into Indiana.
The offshore closed low remains quasi-stationary centered to the west of 140W and will remain so today before starting to lift out toward the PacNW tonight.
Low risk for some very spotty mixed precip/freezing rain this morning in the Laurel Highlands, as a bit of warmer air tries to work in aloft. Upper low rotates through the area Thu-Fri combining with seasonably cold westerly flow to prolong snow showers downwind of the lakes and over the favored upslope areas along the Allegheny Plateau. This will support additional snow accumulation through the end of the week across the higher elevations in the Laurel Highlands and northwest Alleghenies.
For today and Wednesday, high pressure ridge over CA will move east into the Great Basin. Areas of freezing fog this morning in some northern Sierra valleys could occur again late tonight/early Wednesday after another snowmelt cycle, even with some cirrus overhead. This fog potential ends Wednesday night as winds increase ahead of next trough approaching the Pacific Northwest.
612 AM CST Tue Mar 6 2018 Low pressure will continue to spin just east of the region through Tuesday. In addition to snow potential, the low will bring some extremely high winds to the region. Upper level ridging will expand east across the area mid to late week.
518 AM CST Tue Mar 6 2018 The upper low currently centered over NW Iowa will make its way southeastward today centering over central Illinois by this evening. A strong cold pocket aloft characterized by -30 C 500 mb temps and -8 C 850 mb temps will accompany the upper low. Preceding the low, dry 0. 25 inch precipitable water values and dewpoints as low as the mid 20s are poised south of the low to wrap into central IL. The combination of cold temperatures aloft and relatively dry boundary layer will allow snow to reach the ground at slightly warmer temperatures than usual due to evaporational cooling effects, so have included a mix of rain and snow in the forecast with temperatures as high as the upper 30s this afternoon and tonight.
654 AM EST Tue Mar 6 2018 Aviation Chilly and unsettled weather will prevail through the end of the week as a slow moving low pressure system stalls and sits over the eastern Great Lakes Region. Thus we may see a transition to just areas of drizzle as we go through the morning, however with sfc temps rising above freezing and road temps relatively warm it is doubtful we will see much in the way of any travel impacts. These showers develop in the dry slot later today, just northeast of the approaching upper low and aided by strong low level convergence along sfc occlusion/trough.
Downward forcing will still be in place which will allow for mixing of stronger flow in the lower levels to the sfc. As far as temps, 850-700 mb readings are a few degrees cooler over far nern CO today while closer to the foothills there will be some minor downslope warming. Over the higher terrain it will be dry with some gusty winds at times up to 50 mph. Upper level ridging will increase helping to bring warmer than normal temperatures and sunny skies for the latter half of the week. For Wednesday temperatures will be + 3 to 4 degrees C warmer than Tuesday with diurnal winds.
Winds will increase slightly once again tonight, especially along the coast, due to another surge of high pressure. A cold front has pushed through S TX this morning and will continue to push across the Middle Texas Coastal waters through the morning hours. Drier and cooler conditions are expected this afternoon through Wed. Today's highs will be slightly warmer across the northern CWA due to decreasing clouds. Tonight's lows will be much cooler with mid 40s to lower 50s. In the wake of this morning's cold front, advisory conditions with northerly moderate to strong winds will continue through the morning hours. Winds will decrease slightly this afternoon, then restrengthen tonight as another surge of high pressure builds across the area.
Dry weather is anticipated Wednesday as a weak ridge of High Pressure builds into the area.
High pressure aloft will prevail over the region today and Wednesday for dry conditions.
624 AM EST Tue Mar 6 2018 Rain showers are exiting the area at the moment, but MVFR cigs will continue for a few more hours until a cold front moves through the area. Tonight, an upper level trough will cross the area, and bring more cloud cover, likely at VFR levels.