Alert archive / South Carolina / Mesoscale Discussions in 2021
Mesoscale Discussion 1194
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2021, 5:25 AM EDT for 7 counties in South Carolina. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2021, 5:25 AM EDT (09:25 UTC)
- Expired
- Jul 8, 2021, 7:30 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 348
Counties Berkeley County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Williamsburg County, SC
The radar
The Wilmington radar (KLTX), 110 km from the middle of the area, began a volume at 09:28 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
Charleston AFB, SC (KCHS), launched 00:00Z, 9.4 hours before the alert went out and 83 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.
065
ACUS11 KWNS 080926
SWOMCD
SPC MCD 080925
NCZ000-SCZ000-081130-
Mesoscale Discussion 1194
NWS Storm Prediction Center Norman OK
0425 AM CDT Thu Jul 08 2021
Areas affected...east-central and northeastern South Carolina/far
southeastern North Carolina
Concerning...Tornado Watch 348...
Valid 080925Z - 081130Z
The severe weather threat for Tornado Watch 348 continues.
SUMMARY...Risk for brief tornadoes continues to the east and
northeast of the center of Tropical Storm Elsa.
DISCUSSION...Latest radar loops shows a couple of stronger
convective bands east and northeast of Elsa's center. Cells in and
near the more eastern of these convective bands -- stretching inland
across Georgetown County and northwestward across Florence County
South Carolina at this time -- continue to be those exhibiting most
of the indicated low-level rotation that has been observed by
WSR-88D storm-relative velocity data over the past couple of hours.
As Elsa -- and the associated convective bands -- continue shifting
steadily north/northeastward, risk for brief tornadoes will
gradually impinge on some of the southeastern-most counties in North
Carolina, over the next couple of hours.
..Goss.. 07/08/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...ILM...CHS...CAE...
LAT...LON 32787969 33208003 33598012 33948020 34287987 34557916
34047850 33087847 32677880 32787969SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 10:00 PM EDT | Mesoscale Discussion | SPC | Beaufort, Hampton, Jasper | 2 hr |
| Jul 8, 1:38 AM EDT | Mesoscale Discussion | SPC | Beaufort, Berkeley, Charleston, Colleton, Dillon, Dorchester and 5 more | 2 hr |
| Jul 8, 2:01 AM EDT | Tornado Watch | SPC | Florence, Georgetown, Horry, Marion, Williamsburg | 7 hr |
| Jul 8, 7:09 AM EDT | Mesoscale Discussion | SPC | Georgetown, Horry, Marion | 2 hr |
Nearby
Mesoscale Discussions in South 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.