Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 107, NWS Raleigh, NC
NWS Raleigh, NC issued this severe thunderstorm warning at Aug 12, 2021, 5:21 PM EDT for Davidson County, Forsyth County, North Carolina. It was in force for 39 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 12, 2021, 5:21 PM EDT (21:21 UTC)
- Expired
- Aug 12, 2021, 6:00 PM EDT
- In force
- 39 min
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Davidson County, NC, Forsyth County, NC
The radar
The Roanoke radar (KFCX), 107 km from the middle of the area, began a volume at 21:21 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 5:22 PM EDT | TSTM WND DMG | 2 Sw Winston-Salem, NC | TREE ON HOUSE. NO INJURIES REPORTED. |
| Aug 12, 5:32 PM EDT | TSTM WND DMG | 4 Sw Winston-Salem, NC | TREE DOWN ON S STRATFORD ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.4 hours before the alert went out and 43 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
- 1015 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
634
WUUS52 KRAH 122121
SVRRAH
NCC057-067-122200-
/O.NEW.KRAH.SV.W.0107.210812T2121Z-210812T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Raleigh NC
521 PM EDT Thu Aug 12 2021
The National Weather Service in Raleigh has issued a
* Severe Thunderstorm Warning for...
Forsyth County in central North Carolina...
Northeastern Davidson County in central North Carolina...
* Until 600 PM EDT.
* At 520 PM EDT, a severe thunderstorm was located near
Winston-Salem, moving northeast at 15 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Winston-Salem, Kernersville, Clemmons, Bermuda Run, Lewisville,
Walkertown, Rural Hall, Pfafftown, Belews Creek and Arcadia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Hail and damaging winds and continuous cloud to ground lightning is
occurring with this storm. Move indoors immediately.
Heavy rainfall is occurring with this storm, and may lead to flash
flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3611 8050 3612 8046 3626 8030 3626 8004
3599 8005 3589 8037 3596 8038 3599 8042
3601 8042 3606 8046 3604 8049 3605 8051
TIME...MOT...LOC 2120Z 228DEG 13KT 3614 8028
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CA1 follow-up statement
514
WWUS52 KRAH 122142
SVSRAH
Severe Weather Statement
National Weather Service Raleigh NC
542 PM EDT Thu Aug 12 2021
NCC057-067-122200-
/O.CON.KRAH.SV.W.0107.000000T0000Z-210812T2200Z/
Forsyth NC-Davidson NC-
542 PM EDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR FORSYTH AND NORTHEASTERN DAVIDSON COUNTIES...
At 540 PM EDT, a severe thunderstorm was located over Winston-Salem,
moving northeast at 10 mph. This storm is producing heavy rainfall.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Winston-Salem, Kernersville, Clemmons, Bermuda Run, Lewisville,
Walkertown, Rural Hall, Pfafftown, Belews Creek and Arcadia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3614 8041 3626 8030 3626 8004 3599 8005
3589 8037 3596 8038 3599 8042 3607 8042
TIME...MOT...LOC 2140Z 243DEG 8KT 3611 8028
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CAThe office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 3:30 PM EDT | Heat Advisory | RAH | Chatham, Cumberland, Durham, Edgecombe, Franklin, Granville and 12 more | 28 hr |
| Aug 12, 4:39 PM EDT | Special Weather Statement | RAH | Franklin | 66 min |
| Aug 12, 4:56 PM EDT | Special Weather Statement | RAH | Forsyth, Guilford | 64 min |
| Aug 12, 5:38 PM EDT | Areal Flood Advisory | RAH | Forsyth | 108 min |
| Aug 12, 5:59 PM EDT | Special Weather Statement | RAH | Forsyth, Guilford | 61 min |
| Aug 12, 6:03 PM EDT | Special Weather Statement | RAH | Wake | 57 min |
| Aug 12, 6:22 PM EDT | Special Weather Statement | RAH | Durham | 38 min |
| Aug 12, 7:15 PM EDT | Special Weather Statement | RAH | Moore | 45 min |
Nearby
Severe Thunderstorm Warnings in North Carolina, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.