Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 4, 2021, 10:57 AM EDT for 5 counties in North Carolina. It was in force for 36 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
- May 4, 2021, 10:57 AM EDT (14:57 UTC)
- Expired
- May 4, 2021, 11:33 AM EDT
- In force
- 36 min
- Issued by
- NWS Greenville-Spartanburg, SC
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Swain County, NC
The radar
The Knoxville radar (KMRX), 80 km from the middle of the area, began a volume at 14:58 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 4, 9:37 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 3.0 hours before the alert went out and 248 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
- 590 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 753 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted.
337
WUUS52 KGSP 041457
SVRGSP
NCC075-087-099-113-173-041545-
/O.NEW.KGSP.SV.W.0030.210504T1457Z-210504T1545Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Greenville-Spartanburg SC
1057 AM EDT Tue May 4 2021
The National Weather Service in Greenville-Spartanburg has issued a
* Severe Thunderstorm Warning for...
Northwestern Macon County in western North Carolina...
Northwestern Jackson County in western North Carolina...
Swain County in western North Carolina...
Graham County in western North Carolina...
Northwestern Haywood County in western North Carolina...
* Until 1145 AM EDT.
* At 1056 AM EDT, severe thunderstorms were located along a line
extending from 10 miles west of Jefferson City to 12 miles west of
Gatlinburg to 13 miles northwest of Robbinsville to 10 miles south
of Madisonville, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to vehicles is expected. Expect wind
damage to trees and power lines.
* Locations impacted include...
Bryson City, Robbinsville, Cherokee, Town Of Santeetlah, Smoky
Mountains-Newfound Gap, Smoky Mountains-Fontana Area, Lake
Santeetlah, Smoky Mountains-Balsam Mountain, Fontana Lake and Smoky
Mountains-Big Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A few trees and power lines will be blown down in the warned area.
Hail can cause major property damage, especially to vehicles. Seek
shelter inside an interior room.
Please report damaging winds, hail, or flooding to the National
Weather Service Greenville-Spartanburg by calling toll free, 1, 800,
2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet it using
hashtag nwsgsp. Your message should describe the event and the
specific location where it occurred.
&&
LAT...LON 3537 8401 3541 8402 3552 8388 3556 8377
3556 8350 3566 8335 3566 8330 3573 8324
3572 8320 3576 8316 3578 8309 3555 8313
3530 8339 3523 8369 3526 8371 3526 8379
3522 8396 3523 8400 3531 8404
TIME...MOT...LOC 1456Z 286DEG 35KT 3607 8366 3570 8371 3547 8396 3538
8432
HAIL...1.00IN
WIND...60MPH
$$
82 follow-up statements
816
WWUS52 KGSP 041523
SVSGSP
Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
1123 AM EDT Tue May 4 2021
NCC075-087-099-113-173-041545-
/O.CON.KGSP.SV.W.0030.000000T0000Z-210504T1545Z/
Macon NC-Jackson NC-Swain NC-Graham NC-Haywood NC-
1123 AM EDT Tue May 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM EDT
FOR NORTHWESTERN MACON...NORTHWESTERN JACKSON...SWAIN...GRAHAM AND
NORTHWESTERN HAYWOOD COUNTIES...
At 1122 AM EDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Dandridge Tennessee to 9 miles
southeast of Gatlinburg to 10 miles northeast of Robbinsville to 11
miles northwest of Andrews, moving southeast at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Bryson City, Robbinsville, Cherokee, Town Of Santeetlah, Smoky
Mountains-Newfound Gap, Lake Santeetlah, Smoky Mountains-Balsam
Mountain, Smoky Mountains-Big Creek, Smoky Mountains-Deep Creek and
Smoky Mountains-Oconaluftee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Scattered trees and power lines will be blown down in the warned
area. Seek shelter inside an interior room.
Please report damaging winds, hail, or flooding to the National
Weather Service Greenville-Spartanburg by calling toll free, 1, 800,
2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet it using
hashtag nwsgsp. Your message should describe the event and the
specific location where it occurred.
&&
LAT...LON 3533 8403 3541 8370 3556 8354 3556 8350
3566 8335 3566 8330 3573 8324 3572 8320
3576 8316 3578 8309 3555 8313 3530 8339
3523 8369 3526 8371 3526 8379 3522 8396
3523 8400 3531 8404
TIME...MOT...LOC 1522Z 296DEG 31KT 3598 8334 3561 8339 3538 8364 3530
8400
HAIL...0.75IN
WIND...60MPH
$$
8152
WWUS52 KGSP 041533
SVSGSP
Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
1133 AM EDT Tue May 4 2021
NCC075-087-099-113-173-041543-
/O.CAN.KGSP.SV.W.0030.000000T0000Z-210504T1545Z/
Macon NC-Jackson NC-Swain NC-Graham NC-Haywood NC-
1133 AM EDT Tue May 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MACON...
NORTHWESTERN JACKSON...SWAIN...GRAHAM AND NORTHWESTERN HAYWOOD
COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled. However heavy rain is
still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 200 PM EDT for
western North Carolina.
If you observed large hail or wind damage, please report it to the
National Weather Service Greenville-Spartanburg by calling toll free,
1, 800, 2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet
it using hashtag nwsgsp. Your message should describe the event and
the specific location where it occurred.
LAT...LON 3533 8403 3541 8370 3556 8354 3556 8350
3566 8335 3566 8330 3573 8324 3572 8320
3576 8316 3578 8309 3555 8313 3530 8339
3523 8369 3526 8371 3526 8379 3522 8396
3523 8400 3531 8404
TIME...MOT...LOC 1530Z 286DEG 35KT 3596 8324 3559 8329 3536 8354 3528
8390
$$
8The office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 12:09 PM EDT | Areal Flood Advisory | GSP | Graham, Macon, Swain | 3 hr |
| May 4, 3:24 PM EDT | Special Weather Statement | GSP | Cabarrus, Mecklenburg | 36 min |
| May 4, 3:39 PM EDT | Special Weather Statement | GSP | Union | 51 min |
| May 4, 3:53 PM EDT | Severe Thunderstorm Warning | GSP | Union | 52 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.