Alert archive / Virginia / Special Weather Statements in 2020
Special Weather Statement, NWS Charleston, WV
NWS Charleston, WV issued this special weather statement at Aug 6, 2020, 11:32 PM EDT for Buchanan County, Virginia. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2020, 11:32 PM EDT (03:32 UTC)
- Expired
- Aug 7, 2020, 12:00 AM EDT
- In force
- 28 min
- Issued by
- NWS Charleston, WV
County Buchanan County, VA
The radar
The Jackson,KY radar (KJKL), 110 km from the middle of the area, began a volume at 03:32 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Roanoke, VA (KRNK), launched 00:00Z, 3.5 hours before the alert went out and 231 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 309 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1121 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, WV wrote its last area forecast discussion before this special weather statement went out at Aug 6, 10:38 PM EDT, 54 minutes earlier.
Area forecast discussion, Aug 6, 10:38 PM EDT, 54 minutes before
AREA FORECAST DISCUSSION National Weather Service Charleston WV 1038 PM EDT Thu Aug 6 2020 .SYNOPSIS... A series of disturbances move up the Appalachians through Friday. High pressure crosses Saturday, setting up a warming trend into early next week, as it moves east. && .NEAR TERM /THROUGH FRIDAY/... As of 1038 PM Thursday... Temperatures and POPs were adjusted this evening to remain on track with current trends. As of 800 PM Thursday... Elected to increase cloud coverage through the near term period as latest model guidance suggests an uptick in clouds starting late tonight. Also made adjustments to POPs this evening along the mountains as convection wanes with the loss of diurnal heating. As of 200 PM Thursday... Showers and storms will continue to develop mainly across the southern and eastern portions of WV and extreme southwest VA through this evening. An upper level shortwave and the afternoon heating acting on PWATs around 1.8 inches are responsible for this activity. Expect most of the convection to wane down by 9 pm this evening. A Marginal risk for excessive rainfall exists across central Appalachians through Friday. Heavy downpours are possible with this activity as well as repetitive showers over the same areas, posing a threat for localized flooding into Friday. Convective activity will diminish considerable tonight, but PoPs still exist across the eastern half of our forecasting area. Patchy dense fog is also expected mainly along the most protected river valleys overnight tonight. For Friday, a stronger H500 vorticity maxima sweeps across the area to provide better support for showers and storms development mainly during the afternoon and evening hours. WPC has the central Appalachians under a Marginal risk for excessive rainfall as well. Accepted guidance temperatures with near normal values through the period. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY NIGHT/... As of 220 PM Thursday... The pesky long wave trough finally exits east Friday evening as a broad ridge over the Southern Plains begins to to slide into the region. This will result in warm-up for the weekend with highs across the Lowlands in the upper 80s to lower 90s along with minimal precipitation chances as a subsidence inversion based near H800 develops. && .LONG TERM /MONDAY THROUGH THURSDAY/... As of 220 PM Thursday... Subsidence begins to fade as ridging deamplifies in advance of the next system transiting the Upper Great Lakes with a diurnal risk of showers and thunderstorms returning Monday. Models have shifted this feature a bit further north over the last couple runs, so think Monday's highs will be pretty similar to Sunday's in the absence of stronger southwesterly flow. The pattern turns more active for the remainder of the week with copious moisture pooling ahead of a stalling frontal boundary somewhere across the Middle Ohio Valley. Low level moisture coupled with strong surface heating will yield substantial instability, although generally weak winds through the column will limit overall severe potential with the main threats being localized damaging winds with core drops and locally heavy rainfall with slow moving storms. && .AVIATION /03Z FRIDAY THROUGH TUESDAY/... As of 800 PM Thursday... Diurnal heating and ripples of disturbances aloft have resulted in scattered showers and thunderstorms, primarily along the spine of the Appalachians. At the time of writing, BKW was receiving a direct hit in flight restrictions due to convection, and can't rule out EKN falling into the same boat. Convection wanes over the next several hours, returning all terminals to VFR for a time. Confidence severs overnight tonight as river valley fog production contends with increasing cloud coverage aloft. Held onto fog across our most vulnerable sites of CRW, EKN, and CKB, while excluding HTS and PKB with this issuance. Will also have to monitor BKW for fog now that the terminal has observed rain this evening. A similar forecast is painted for Friday with convection sprouting in the afternoon, potentially in close vicinity to our mountain aerodromes. For now, chose to include VCTS at BKW to account for this. Winds remain light throughout the period. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z SATURDAY... FORECAST CONFIDENCE: Medium. ALTERNATE SCENARIOS: Timing and intensity of fog may vary from the forecast overnight. EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY OF WFO FORECAST TO AVAILABLE MODEL INFORMATION: H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL. M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS. L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL. DATE FRI 08/07/20 UTC 1HRLY 03 04 05 06 07 08 09 10 11 12 13 14 EDT 1HRLY 23 00 01 02 03 04 05 06 07 08 09 10 CRW CONSISTENCY H H H H L L M M M M M H HTS CONSISTENCY H H H H H M M H H L H H BKW CONSISTENCY H H M M L L L L L L H H EKN CONSISTENCY H H H M L L M M M M L H PKB CONSISTENCY H H H H H H H H H H H H CKB CONSISTENCY H H H L H L M L L H H H AFTER 00Z SATURDAY... Overnight river valley fog may lead to IFR conditions this weekend into early next week. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...None. OH...None. KY...None. VA...None. && SYNOPSIS...ARJ/JP NEAR TERM...ARJ/MEK SHORT TERM...JP LONG TERM...JP AVIATION...MEK
Hazardous weather outlook, Aug 6, 6:39 AM EDT, 16 hours 53 minutes before
Hazardous Weather Outlook National Weather Service Charleston WV 639 AM EDT Thu Aug 6 2020 VAZ003-004-WVZ033-034-515-516-524-071045- Dickenson-Buchanan-McDowell-Wyoming-Northwest Raleigh- Southeast Raleigh-Southeast Pocahontas- 639 AM EDT Thu Aug 6 2020 This Hazardous Weather Outlook is for southwest Virginia, the southern mountains of West Virginia, and portions of the central mountains of WV. .DAY ONE...Today and Tonight. Thunderstorms this afternoon and evening could bring strong to damaging wind gusts, along with locally heavy downpours. There are marginal risks for severe thunderstorms and excessive rainfall. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions by calling the toll-free spotter hotline, or by other methods detailed at www.weather.gov/rlx/reports. WVZ027-028-030>032-039-040-517>523-525-526-071045- Clay-Braxton-Lewis-Harrison-Taylor-Upshur-Barbour-Northwest Fayette- Southeast Fayette-Northwest Nicholas-Southeast Nicholas- Northwest Webster-Southeast Webster-Northwest Pocahontas- Northwest Randolph-Southeast Randolph- 639 AM EDT Thu Aug 6 2020 This Hazardous Weather Outlook is for the northern mountains of West Virginia, portions of the central mountains of West Virginia, and portions of the northern and central lowlands of West Virginia. .DAY ONE...Today and Tonight. Thunderstorms this afternoon and evening could bring strong wind gusts, along with locally heavy downpours. There is a marginal risk for excessive rainfall. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions by calling the toll-free spotter hotline, or by other methods detailed at www.weather.gov/rlx/reports. KYZ101>103-105-OHZ066-067-075-076-083>087-WVZ005>011-013>020-024>026- 029-071045- Greenup-Carter-Boyd-Lawrence KY-Perry-Morgan-Athens-Washington- Jackson OH-Vinton-Meigs-Gallia-Lawrence OH-Wayne-Cabell-Mason- Jackson WV-Wood-Pleasants-Tyler-Lincoln-Putnam-Kanawha-Roane-Wirt- Calhoun-Ritchie-Doddridge-Mingo-Logan-Boone-Gilmer- 639 AM EDT Thu Aug 6 2020 This Hazardous Weather Outlook is for northeast Kentucky, southeast Ohio, the western lowlands and portions of central lowlands of West Virginia. .DAY ONE...Today and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. TRM / RG
In the hours before
Special weather statement, Aug 6, 11:32 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Charleston WV
1132 PM EDT Thu Aug 6 2020
VAZ004-070400-
Buchanan-
1132 PM EDT Thu Aug 6 2020
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL BUCHANAN COUNTY...
At 1132 PM EDT, a strong thunderstorm was located near Big Rock, or
near Grundy, moving southeast at 15 mph.
Wind gusts up to 50 mph and nickel size hail are possible with this
storm.
Locations impacted include...
Grundy, Roseann and Vansant.
To report severe weather, contact your nearest law enforcement
agency. They can relay your report to the National Weather Service
office in Charleston West Virginia.
LAT...LON 3734 8221 3739 8215 3737 8202 3730 8199
3723 8206
TIME...MOT...LOC 0332Z 297DEG 14KT 3733 8214
HARTThe office that day
Everything else NWS Charleston, WV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 4:20 AM EDT | Special Weather Statement | RLX | Calhoun, Gilmer, Lewis | 25 min |
| Aug 6, 10:52 PM EDT | Severe Thunderstorm Warning | RLX | Buchanan, Dickenson | 38 min |
| Aug 7, 12:18 AM EDT | Special Weather Statement | RLX | Dickenson | 27 min |
| Aug 7, 12:37 AM EDT | Flash Flood Warning | RLX | Buchanan | 113 min |
| Aug 7, 1:04 AM EDT | Special Weather Statement | RLX | Buchanan, Dickenson | 26 min |
| Aug 7, 1:13 AM EDT | Flash Flood Warning | RLX | Buchanan, Dickenson | 3 hr |
| Aug 7, 4:22 PM EDT | Special Weather Statement | RLX | Highland | 38 min |
Nearby
Special Weather Statements in Virginia, 2020Every special weather statement in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.