Alert archive / South Carolina / Special Weather Statements in 2021
Special Weather Statement, NWS Charleston, SC
NWS Charleston, SC issued this special weather statement at Aug 17, 2021, 12:58 PM EDT for Charleston County, South Carolina. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2021, 12:58 PM EDT (16:58 UTC)
- Expired
- Aug 17, 2021, 1:30 PM EDT
- In force
- 32 min
- Issued by
- NWS Charleston, SC
- Hail
- 0.00 in
- Wind
- 55
County Charleston County, SC
The radar
The Charleston,SC radar (KCLX), 77 km from the middle of the area, began a volume at 16:58 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 12:00Z, 5.0 hours before the alert went out and 31 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
- 1066 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 639 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, SC wrote its last area forecast discussion before this special weather statement went out at Aug 17, 10:31 AM EDT, 2 hours 27 minutes earlier.
Area forecast discussion, Aug 17, 10:31 AM EDT, 2 hours 27 minutes before
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</html>Hazardous weather outlook, Aug 17, 11:35 AM EDT, 1 hour 23 minutes before
Hazardous Weather Outlook National Weather Service Charleston SC 1135 AM EDT Tue Aug 17 2021 SCZ049-050-181545- Coastal Colleton-Charleston- 1135 AM EDT Tue Aug 17 2021 ...MODERATE RISK FOR RIP CURRENTS IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southeast South Carolina. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Moderate Risk for Rip Currents. Heavy Rainfall: A few clusters of heavy rainfall producing thunderstorms will continue to move across portions of southeast South Carolina through early afternoon. The intense rainfall rates may produce at least minor flooding in and around urban areas including, but not limited to, Summerville, Charleston, and Moncks Corner. While most impacts will likely be minor, flash flooding could also occur if the heaviest rain repeatedly impacts the same area. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. SCZ043>045-052-181545- Inland Colleton-Dorchester-Inland Berkeley-Tidal Berkeley- 1135 AM EDT Tue Aug 17 2021 This Hazardous Weather Outlook is for southeast South Carolina. .DAY ONE...This afternoon and tonight. Heavy Rainfall: A few clusters of heavy rainfall producing thunderstorms will continue to move across portions of southeast South Carolina through early afternoon. The intense rainfall rates may produce at least minor flooding in and around urban areas including, but not limited to, Summerville, Charleston, and Moncks Corner. While most impacts will likely be minor, flash flooding could also occur if the heaviest rain repeatedly impacts the same area. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. AMZ330-350-352-354-374-GAZ087-088-099>101-114>116-118-137-138-140- SCZ040-042-047-181545- Charleston Harbor- Waters from South Santee River to Edisto Beach SC out 20 NM- Waters from Edisto Beach SC to Savannah GA out 20 NM- Waters from Savannah GA to Altamaha Sound GA out 20 NM, including Grays Reef National Marine Sanctuary- Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM- Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans- Inland Bryan-Inland Chatham-Long-Inland Liberty-Inland McIntosh- Allendale-Hampton-Inland Jasper- 1135 AM EDT Tue Aug 17 2021 This Hazardous Weather Outlook is for Atlantic coastal waters, southeast Georgia and southeast South Carolina. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. GAZ117-119-139-141-SCZ048-051-181545- Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh- Beaufort-Coastal Jasper- 1135 AM EDT Tue Aug 17 2021 ...MODERATE RISK FOR RIP CURRENTS IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Moderate Risk for Rip Currents. Severe Thunderstorms: Additional thunderstorms are possible this afternoon into early evening. A few storms might produce damaging wind gusts. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
In the hours before
Local storm report, Aug 17, 7:45 AM EDT, 5 hours 13 minutes before
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</html>Local storm report, Aug 17, 7:54 AM EDT, 5 hours 4 minutes before
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</html>Local storm report, Aug 17, 10:19 AM EDT, 2 hours 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1019 AM EDT TUE AUG 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1006 AM HEAVY RAIN 1 WNW CHARLESTON 32.79N 79.95W
08/17/2021 U0.00 INCH CHARLESTON SC PUBLIC
THE PUBLIC REPORTED THE INTERSECTION OF PRESIDENT
STREET AND LINE STREET CLOSED FROM RECENT RAINS.
&&
EVENT NUMBER CHS2100566
DPBSpecial weather statement, Aug 17, 12:58 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Charleston SC
1258 PM EDT Tue Aug 17 2021
SCZ050-171730-
Charleston-
1258 PM EDT Tue Aug 17 2021
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CHARLESTON COUNTY...
At 1258 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Bears Bluff, or 9 miles west of Johns
Island, moving northeast at 15 mph.
HAZARD...strong winds 45 to 55 mph.
SOURCE...Radar Indicated.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects.
Some locations in the path of this storm include...
West Ashley, Johns Island, Hollywood, Ravenel, Meggett, Yonges
Island, Bears Bluff and Wadmalaw Island.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm and may lead to
flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.
This storm may intensify. Be certain to monitor local radio and TV
stations as well as local cable TV outlets for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3259 8022 3262 8030 3283 8027 3279 8007
TIME...MOT...LOC 1658Z 203DEG 14KT 3265 8023
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH
SPRThe office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 2:41 AM EDT | Special Marine Warning | CHS | 36 min | |
| Aug 17, 3:19 AM EDT | Special Marine Warning | CHS | 116 min | |
| Aug 17, 3:32 AM EDT | Special Marine Warning | CHS | 118 min | |
| Aug 17, 5:34 AM EDT | Special Marine Warning | CHS | 86 min | |
| Aug 17, 6:38 AM EDT | Special Marine Warning | CHS | 52 min | |
| Aug 17, 7:30 AM EDT | Special Marine Warning | CHS | 2 hr | |
| Aug 17, 2:42 PM EDT | Areal Flood Advisory | CHS | Charleston | 63 min |
| Aug 17, 2:58 PM EDT | Special Weather Statement | CHS | Jasper | 32 min |
| Aug 17, 2:30 PM EDT | Special Weather Statement | CHS | Chatham | 30 min |
Nearby
Special Weather Statements in South Carolina, 2021Every special weather statement 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.