Alert archive / North Carolina / Mesoscale Discussions in 2021
Mesoscale Discussion 301
The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2021, 4:53 PM EDT for 19 counties in North Carolina; 5 counties in Virginia. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Mar 28, 2021, 4:53 PM EDT (20:53 UTC)
- Expired
- Mar 28, 2021, 6:00 PM EDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 68
All 24 counties
Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Gates County, NC, Greene County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Pamlico County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, City of Chesapeake, VA, City of Norfolk, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA
The radar
The Morehead City radar (KMHX), 109 km from the middle of the area, began a volume at 20:55 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
Newport, NC (KMHX), launched 12:00Z, 8.9 hours before the alert went out and 108 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
- 184 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 936 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.8
The text
As transmitted.
881
ACUS11 KWNS 282054
SWOMCD
SPC MCD 282053
NCZ000-VAZ000-282200-
Mesoscale Discussion 0301
NWS Storm Prediction Center Norman OK
0353 PM CDT Sun Mar 28 2021
Areas affected...Southeast Virginia and eastern North Carolina
Concerning...Severe Thunderstorm Watch 68...
Valid 282053Z - 282200Z
The severe weather threat for Severe Thunderstorm Watch 68
continues.
SUMMARY...Threat for damaging wind gusts across WW68 should continue
into early evening.
DISCUSSION...A broken band of storms roughly along the I-95 corridor
from Virginia southward will continue to move east over the next few
hours. A few wind gusts to 50kts have been noted with these storms
suggesting a damaging wind risk remains. SPC mesoanalysis indicates
sufficient buoyancy of 1000-1500 J/kg of MLCAPE exists east of the
ongoing storms. This should continue to support strong updraft
development and a subsequent severe weather risk into the early
evening. Storm longevity is a bit more questionable farther east
toward the coast where a modified airmass exists behind an inland
seabreaze front. Cooler temperatures should eventually weaken storms
near the coast and barrier islands this evening.
..Lyons.. 03/28/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...AKQ...MHX...RAH...
LAT...LON 34957702 34977839 35377793 35867746 36257715 36547691
36997664 37007593 36327566 35737573 35377597 35167633
35027671 34957702SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 2:25 AM EDT | Mesoscale Discussion | SPC | Avery, Buncombe, Cherokee, Clay, Graham, Haywood and 7 more | 2 hr |
| Mar 28, 3:07 AM EDT | Severe Thunderstorm Watch | SPC | Cherokee, Clay, Graham, Macon, Swain | 6 hr |
| Mar 28, 12:38 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Cabarrus, Caswell, Chatham, Cumberland and 19 more | 3 hr |
| Mar 28, 3:24 PM EDT | Severe Thunderstorm Watch | SPC | Beaufort, Bertie, Camden, Chowan, Craven, Cumberland and 26 more | 4 hr |
| Mar 28, 1:24 PM EDT | Mesoscale Discussion | SPC | Accomack, Amelia, Appomattox, Arlington, Brunswick, Buckingham and 66 more | 2 hr |
| Mar 28, 5:05 PM EDT | Severe Thunderstorm Watch | SPC | Arlington, Fairfax, Fauquier, Prince William, Stafford, City of Alexandria and 3 more | 4 hr |
Nearby
Mesoscale Discussions in North Carolina, 2021Mesoscale Discussions in Virginia, 2021Every mesoscale discussion 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.