Alert archive / South Carolina / Special Weather Statements in 2015

Special Weather Statement, NWS Charleston, SC

September 24, 2015Beaufort County, South Carolina

NWS Charleston, SC issued this special weather statement at Sep 24, 2015, 8:49 PM EDT for Beaufort County, South Carolina. It was in force for 26 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: Sep 24, 2015, 8:49 PM EDT (00:49 UTC)
Expired: Sep 24, 2015, 9:15 PM EDT
In force: 26 min
Issued by: NWS Charleston, SC

County Beaufort County, SC

The radar

The Charleston,SC radar (KCLX), 63 km from the middle of the area, began a volume at 00:53 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, 0.8 hours before the alert went out and 56 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 449 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Sep 24, 7:37 PM EDT, 1 hour 12 minutes earlier.

Area forecast discussion, Sep 24, 7:37 PM EDT, 1 hour 12 minutes before

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Hazardous weather outlook, Sep 24, 7:42 PM EDT, 1 hour 7 minutes before

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In the hours before

Local storm report, Sep 24, 6:39 PM EDT, 2 hours 10 minutes before

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Local storm report, Sep 24, 7:31 PM EDT, 1 hour 18 minutes before

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Local storm report, Sep 24, 7:38 PM EDT, 1 hour 11 minutes before

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Local storm report, Sep 24, 7:58 PM EDT, 51 minutes before

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Local storm report, Sep 24, 8:09 PM EDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
809 PM EDT THU SEP 24 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0803 PM     HIGH ASTR TIDES  1 SE CHARLESTON         32.77N  79.92W
09/24/2015                   CHARLESTON         SC   PILOT BOAT

            STANDING SALT WATER WAS REPORTED IN THE VICINITY OF THE
            CHARLESTON BRANCH PILOTS ASSOCIATION OFFICE.

&&

EVENT NUMBER CHS1501034

SPR

Special weather statement, Sep 24, 8:49 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
849 PM EDT THU SEP 24 2015

SCZ049-050-250115-
CHARLESTON SC-COASTAL COLLETON SC-
849 PM EDT THU SEP 24 2015

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF COLLETON COUNTY UNTIL
915 PM EDT...

AT 849 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
EDISTO BEACH...MOVING NORTHWEST AT 15 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
EDISTO BEACH AND BENNETTS POINT.

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.

&&

LAT...LON 3248 8033 3250 8037 3247 8041 3250 8043
      3250 8049 3255 8053 3262 8043 3261 8041
      3255 8041 3249 8033 3253 8035 3251 8029
TIME...MOT...LOC 0049Z 120DEG 11KT 3247 8034

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 24, 9:45 PM EDT	Areal Flood Advisory	CHS	Charleston, Colleton	60 min
Sep 24, 10:14 PM EDT	Special Marine Warning	CHS		31 min
Sep 24, 10:17 PM EDT	Special Weather Statement	CHS	Beaufort	28 min
Sep 24, 10:18 PM EDT	Special Weather Statement	CHS	Beaufort	27 min
Sep 24, 10:35 PM EDT	Special Marine Warning	CHS		115 min
Sep 24, 10:44 PM EDT	Areal Flood Advisory	CHS	Charleston, Colleton	2 hr
Sep 24, 11:01 PM EDT	Flash Flood Watch	CHS	Berkeley, Colleton, Dorchester	5 hr
Sep 24, 11:34 PM EDT	Areal Flood Advisory	CHS	Beaufort	86 min
Sep 25, 12:24 AM EDT	Areal Flood Advisory	CHS	Charleston, Colleton, Dorchester	96 min
Sep 25, 12:37 AM EDT	Severe Thunderstorm Warning	CHS	Charleston	53 min
Sep 25, 12:38 AM EDT	Tornado Warning	CHS	Charleston	37 min
Sep 25, 12:45 AM EDT	Tornado Warning	CHS	Berkeley, Charleston, Dorchester	45 min
Sep 25, 1:38 AM EDT	Special Weather Statement	CHS	Charleston	37 min
Sep 25, 1:50 AM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston, Dorchester	25 min
Sep 25, 2:11 AM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston, Colleton, Dorchester	94 min
Sep 25, 3:45 AM EDT	Coastal Flood Advisory	CHS		3 hr
Sep 25, 10:57 AM EDT	Coastal Flood Advisory	CHS		10 hr

Nearby

Special Weather Statements in South Carolina, 2015 Every special weather statement in 2015

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.