Alert archive / North Carolina / Mesoscale Discussions in 2021
Mesoscale Discussion 1375
The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2021, 4:16 PM EDT for 29 counties in North Carolina; City of Franklin, Virginia. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2021, 4:16 PM EDT (20:16 UTC)
- Expired
- Jul 28, 2021, 6:15 PM EDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 398
All 30 counties
Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Sampson County, NC, Tyrrell County, NC, Wake County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, City of Franklin, VA
The radar
The Raleigh/Durham radar (KRAX), 62 km from the middle of the area, began a volume at 20:16 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, 8.3 hours before the alert went out and 124 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
- 2446 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
191
ACUS11 KWNS 282016
SWOMCD
SPC MCD 282016
NCZ000-VAZ000-282215-
Mesoscale Discussion 1375
NWS Storm Prediction Center Norman OK
0316 PM CDT Wed Jul 28 2021
Areas affected...Southeastern Virginia and eastern North Carolina
Concerning...Severe Thunderstorm Watch 398...
Valid 282016Z - 282215Z
The severe weather threat for Severe Thunderstorm Watch 398
continues.
SUMMARY...Wind gusts potential will continue within WW 398 as a
cluster of storms in northeast North Carolina moves southwest. The
greatest threat will likely be where cold pool interactions with the
sea breeze and storms moving out of the Piedmont occur.
DISCUSSION...The most prominent cluster of convection has recently
moved out of southeastern Virginia into northeastern North Carolina.
The most intense portion of this cluster has generally been on the
southeastern flank where its outflow has interacted with the sea
breeze front within the Coast Plain. To the west, convection
continues to increase within the surface trough in the Piedmont. As
the primary cluster moves southwestward into the greatest buoyancy
(2500 J/kg MLCAPE) along with slow progression of storms
southeastward away from the Piedmont may lead to additional cold
pool mergers and a subsequent threat for damaging wind gusts.
..Wendt.. 07/28/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...AKQ...MHX...RAH...ILM...
LAT...LON 35467909 36447781 36717706 36547619 36157571 35337625
34767772 34787846 34857917 35097929 35467909SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 12:36 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Camden, Chowan, Craven and 28 more | 114 min |
| Jul 28, 2:19 PM EDT | Severe Thunderstorm Watch | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 29 more | 6 hr |
| Jul 28, 6:07 PM EDT | Mesoscale Discussion | SPC | Anson, Bladen, Brunswick, Columbus, Cumberland, Duplin and 8 more | 83 min |
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.