Alert archive / Virginia / Mesoscale Discussions in 2021
Mesoscale Discussion 1201
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2021, 4:08 PM EDT for 8 counties in North Carolina; 17 counties in Virginia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2021, 4:08 PM EDT (20:08 UTC)
- Expired
- Jul 8, 2021, 6:15 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 350
All 25 counties
Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Hertford County, NC, Pasquotank County, NC, Perquimans County, NC, Tyrrell County, NC, City of Chesapeake, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Isle of Wight County, VA, James City County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA
The radar
The Norfolk radar (KAKQ), 79 km from the middle of the area, began a volume at 20:09 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.1 hours before the alert went out and 187 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
- 654 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 1222 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
026
ACUS11 KWNS 082009
SWOMCD
SPC MCD 082008
NCZ000-VAZ000-082215-
Mesoscale Discussion 1201
NWS Storm Prediction Center Norman OK
0308 PM CDT Thu Jul 08 2021
Areas affected...northeast North Carolina into southeast Virginia
Concerning...Tornado Watch 350...
Valid 082008Z - 082215Z
The severe weather threat for Tornado Watch 350 continues.
SUMMARY...A tornado threat continues over northeast North Carolina,
and into southeast Virginia shortly.
DISCUSSION...Surface analysis shows a theta-e axis over eastern NC,
with backed easterly surface winds and slightly cooler temperatures
into VA. SRH continues to increase ahead of Elsa, with 0-1 km values
in excess of 200 m2/s2. While the air mass over VA is a bit cooler
than farther south, warm advection into this region may allow the
favorable tornado zone to translate slowly northeastward over the
next few hours.
..Jewell.. 07/08/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...AKQ...MHX...
LAT...LON 36077562 35757565 35677596 35757617 36067664 36287718
36557751 36797739 37277721 37377673 37317635 37077606
36337566 36077562SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 1:38 AM EDT | Mesoscale Discussion | SPC | Bladen, Brunswick, Columbus, New Hanover, Pender, Robeson | 2 hr |
| Jul 8, 2:01 AM EDT | Tornado Watch | SPC | Bladen, Brunswick, Columbus, New Hanover, Pender | 7 hr |
| Jul 8, 7:09 AM EDT | Mesoscale Discussion | SPC | Bladen, Brunswick, Carteret, Columbus, Craven, Duplin and 11 more | 2 hr |
| Jul 8, 8:35 AM EDT | Tornado Watch | SPC | Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 23 more | 6 hr |
| Jul 8, 12:11 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 23 more | 2 hr |
| Jul 8, 1:50 PM EDT | Tornado Watch | SPC | Beaufort, Bertie, Camden, Chowan, Currituck, Dare and 11 more | 11 hr |
| Jul 8, 6:48 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Chowan, Currituck, Dare and 8 more | 117 min |
Nearby
Mesoscale Discussions in Virginia, 2021Mesoscale Discussions in North Carolina, 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.