Alert archive / North Carolina / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 58
The Storm Prediction Center issued this severe thunderstorm watch at Mar 27, 2021, 2:03 PM EDT for 41 counties in North Carolina; 9 counties in Virginia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2021, 2:03 PM EDT (18:03 UTC)
- Expired
- Mar 27, 2021, 8:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 50 counties
Alamance County, NC, Alexander County, NC, Alleghany County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Caswell County, NC, Catawba County, NC, Chatham County, NC, Davidson County, NC, Davie County, NC, Durham County, NC, Edgecombe County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Iredell County, NC, Johnston County, NC, Lee County, NC, Lincoln County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Rockingham County, NC, Rowan County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilkes County, NC, Wilson County, NC, Yadkin County, NC, Carroll County, VA, City of Danville, VA, City of Martinsville, VA, Floyd County, VA, Franklin County, VA, Halifax County, VA, Henry County, VA, Patrick County, VA, Pittsylvania County, VA
The radar
The Roanoke radar (KFCX), 102 km from the middle of the area, began a volume at 18:04 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 2:04 PM EDT | Severe Thunderstorm Warning | RNK | Floyd, Franklin, Patrick | 41 min |
| Mar 27, 2:06 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Ashe, Surry, Watauga, Wilkes | 39 min |
| Mar 27, 2:19 PM EDT | Severe Thunderstorm Warning | GSP | Alexander, Caldwell | 29 min |
| Mar 27, 2:31 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Guilford, Randolph | 59 min |
| Mar 27, 2:38 PM EDT | Severe Thunderstorm Warning | RNK | Bedford, Campbell, Franklin, Pittsylvania | 52 min |
| Mar 27, 2:56 PM EDT | Severe Thunderstorm Warning | RNK | Rockingham, Stokes, Surry, Wilkes, Yadkin | 64 min |
| Mar 27, 3:17 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Guilford, Orange, Randolph | 43 min |
| Mar 27, 3:59 PM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Mecklenburg | 31 min |
| Mar 27, 4:12 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Montgomery, Moore, Randolph | 48 min |
| Mar 27, 4:17 PM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Rowan | 28 min |
| Mar 27, 4:19 PM EDT | Tornado Warning | RAH | Lee, Montgomery, Moore | 41 min |
| Mar 27, 4:26 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Chatham, Davidson, Randolph | 64 min |
| Mar 27, 4:29 PM EDT | Severe Thunderstorm Warning | RAH | Montgomery, Stanly | 46 min |
| Mar 27, 4:42 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Durham, Franklin, Granville, Wake | 48 min |
| Mar 27, 4:57 PM EDT | Severe Thunderstorm Warning | RAH | Harnett, Lee, Moore | 48 min |
| Mar 27, 5:07 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Montgomery, Moore, Richmond, Stanly | 38 min |
| Mar 27, 5:13 PM EDT | Tornado Warning | RAH | Johnston, Nash, Wake, Wilson | 47 min |
| Mar 27, 5:42 PM EDT | Severe Thunderstorm Warning | RAH | Cumberland, Harnett, Johnston, Lee, Moore, Sampson and 1 more | 48 min |
| Mar 27, 6:00 PM EDT | Severe Thunderstorm Warning | RAH | Edgecombe, Nash, Wilson | 45 min |
| Mar 27, 6:24 PM EDT | Severe Thunderstorm Warning | RAH | Johnston, Wayne, Wilson | 51 min |
| Mar 27, 6:36 PM EDT | Tornado Warning | RAH | Johnston, Wayne | 54 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.1 hours before the alert went out and 14 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2434 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
616 WWUS20 KWNS 271800 SEL8 SPC WW 271800 NCZ000-VAZ000-280000- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 58 NWS Storm Prediction Center Norman OK 200 PM EDT Sat Mar 27 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Parts of northern and central North Carolina Parts of extreme southern Virginia * Effective this Saturday afternoon and evening from 200 PM until 800 PM EDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...A cluster of storms crossing the Appalachians will likely maintain organization while it moves eastward near and just south of the Virginia/North Carolina border. The storm environment favors a threat of damaging winds and large hail through the afternoon and into this evening. The severe thunderstorm watch area is approximately along and 45 statute miles north and south of a line from 80 miles west of Greensboro NC to 40 miles east of Raleigh NC. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 27030. ...Thompson
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 1:39 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Anson, Burke, Cabarrus, Caldwell and 42 more | 66 min |
| Mar 27, 4:49 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Chatham, Durham, Edgecombe, Franklin and 19 more | 56 min |
| Mar 27, 5:29 PM EDT | Severe Thunderstorm Watch | SPC | Anson, Beaufort, Craven, Cumberland, Duplin, Greene and 13 more | 5 hr |
| Mar 27, 7:53 PM EDT | Mesoscale Discussion | SPC | Beaufort, Carteret, Craven, Duplin, Greene, Hyde and 7 more | 97 min |
| Mar 27, 11:00 AM EDT | Mesoscale Discussion | SPC | Lee, Scott, City of Bristol, City of Norton | 90 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2021Severe Thunderstorm Watches in Virginia, 2021Every severe thunderstorm watch 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.