Alert archive / South Carolina / Mesoscale Discussions in 2021
Mesoscale Discussion 1193
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2021, 1:38 AM EDT for 6 counties in North Carolina; 11 counties in South Carolina. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2021, 1:38 AM EDT (05:38 UTC)
- Expired
- Jul 8, 2021, 3:45 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 347
Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Pender County, NC, Robeson County, NC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Williamsburg County, SC
The radar
The Wilmington radar (KLTX), 130 km from the middle of the area, began a volume at 05:37 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 00:00Z, 5.6 hours before the alert went out and 59 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
- 1185 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 801 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
778
ACUS11 KWNS 080539
SWOMCD
SPC MCD 080538
NCZ000-SCZ000-080745-
Mesoscale Discussion 1193
NWS Storm Prediction Center Norman OK
1238 AM CDT Thu Jul 08 2021
Areas affected...eastern South Carolina...southeastern North
Carolina
Concerning...Tornado Watch 347...
Valid 080538Z - 080745Z
The severe weather threat for Tornado Watch 347 continues.
SUMMARY...Tornado risk continues east and northeast of the center of
Tropical Storm Elsa. As risk spreads northeastward with time, a new
tornado watch will be required (within the next 1/2 hour or so).
DISCUSSION...Latest radar loop shows several small/rotating cells --
mainly embedded within the primary convective band which is now
beginning to shift into the Charleston metro area. This band is
currently advancing northward at around 25 kt -- which will place
this band near the northern fringe of the watch by 0630Z -- about an
hour from now. With the latest VWP from the KCLX WSR-88d showing
low-level flow veering rapidly with height yielding 35-40 kt 0-1km
shear, and dewpoints well into the mid to upper 70s across the
coastal tier or two of counties, expect low-level rotation -- and
potential for occasional tornadic spin-ups -- to continue over the
next several hours. A new WW will be required -- that will extend
northward into southeastern North Carolina.
..Goss.. 07/08/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...RAH...ILM...CHS...CAE...
LAT...LON 31788008 32178072 32698108 33278055 33977989 34637937
34757869 34467762 33817793 33447871 32237950 31788008SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 4:08 PM EDT | Mesoscale Discussion | SPC | Camden, Chowan, Currituck, Gates, Hertford, Pasquotank and 2 more | 2 hr |
| Jul 8, 6:48 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Chowan, Currituck, Dare and 8 more | 117 min |
| Jul 7, 10:00 PM EDT | Mesoscale Discussion | SPC | Beaufort, Hampton, Jasper | 2 hr |
| Jul 8, 5:25 AM EDT | Mesoscale Discussion | SPC | Berkeley, Dillon, Florence, Georgetown, Horry, Marion and 1 more | 2 hr |
Nearby
Mesoscale Discussions in South Carolina, 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.