Alert archive / Georgia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 183, NWS Charleston, SC

August 20, 2010Bryan County, Liberty County, Georgia

NWS Charleston, SC issued this severe thunderstorm warning at Aug 20, 2010, 7:38 PM EDT for Bryan County, Liberty County, Georgia. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 20, 2010, 7:38 PM EDT (23:38 UTC)
Expired: Aug 20, 2010, 8:45 PM EDT
In force: 67 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Bryan County, GA, Liberty County, GA

The radar

The Charleston,SC radar (KCLX), 91 km from the middle of the area, began a volume at 23:42 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, 11.6 hours before the alert went out and 175 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: 2199 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 750 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -82 m²/s²
0-3 km storm-relative helicity: -78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 20, 6:58 PM EDT, 40 minutes earlier.

Area forecast discussion, Aug 20, 6:58 PM EDT, 40 minutes before

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Hazardous weather outlook, Aug 20, 7:07 PM EDT, 31 minutes before

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In the hours before

Local storm report, Aug 20, 5:56 PM EDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
556 PM EDT FRI AUG 20 2010

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

0538 PM     TSTM WND DMG     4 NNW BLUFFTON          32.29N 80.89W
08/20/2010                   BEAUFORT           SC   LAW ENFORCEMENT

            A TREE WAS BLOWN DOWN AND WAS BLOCKING PINCKNEY COLONY
            ROAD NEAR THE FORDING ISLAND ROAD INTERSECTION.

&&

Local storm report, Aug 20, 6:11 PM EDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
611 PM EDT FRI AUG 20 2010

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

0605 PM     TSTM WND GST     SAVANNAH                32.05N 81.08W
08/20/2010  E60 MPH          CHATHAM            GA   NWS EMPLOYEE

            STRONG THUNDERSTORM WINDS WERE REPORTED BY AN NWS
            EMPLOYEE ON RIVER STREET IN SAVANNAH.

&&

Local storm report, Aug 20, 6:13 PM EDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
613 PM EDT FRI AUG 20 2010

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

0603 PM     TSTM WND DMG     1 ESE SAVANNAH          32.05N 81.07W
08/20/2010                   CHATHAM            GA   PUBLIC

            MULTIPLE 5 TO 7 FEET TREE LIMBS DOWN.

&&

RPA

Local storm report, Aug 20, 6:18 PM EDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
618 PM EDT FRI AUG 20 2010

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

0607 PM     HAIL             3 WNW BLUFFTON          32.26N 80.91W
08/20/2010  E0.50 INCH       BEAUFORT           SC   PUBLIC

            DIME SIZE HAIL REPORTED COVERING BACKYARD.

&&

RPA

Local storm report, Aug 20, 6:43 PM EDT, 55 minutes before

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Local storm report, Aug 20, 7:06 PM EDT, 32 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:49 PM EDT	Special Marine Warning	CHS		66 min
Aug 20, 3:06 AM EDT	Heat Advisory	CHS	Bulloch, Candler, Effingham, Evans, Jenkins, Long and 2 more	16 hr
Aug 20, 2:55 PM EDT	Special Marine Warning	CHS		65 min
Aug 20, 5:58 PM EDT	Severe Thunderstorm Warning	CHS	Chatham, Effingham	62 min
Aug 20, 6:03 PM EDT	Special Marine Warning	CHS		87 min
Aug 20, 6:33 PM EDT	Flash Flood Warning	CHS	Chatham, Effingham	97 min
Aug 20, 7:06 PM EDT	Areal Flood Advisory	CHS	Bulloch, Jenkins, Screven	46 min
Aug 19, 8:16 PM EDT	Special Weather Statement	CHS	Berkeley	59 min
Aug 19, 9:15 PM EDT	Special Weather Statement	CHS	Berkeley	60 min
Aug 20, 3:00 PM EDT	Special Weather Statement	CHS	Charleston	45 min
Aug 20, 3:44 PM EDT	Special Weather Statement	CHS	Charleston	46 min
Aug 20, 4:07 PM EDT	Areal Flood Advisory	CHS	Charleston	83 min
Aug 20, 4:24 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Charleston, Colleton	39 min
Aug 20, 4:40 PM EDT	Flash Flood Warning	CHS	Berkeley, Charleston, Dorchester	2 hr
Aug 20, 5:27 PM EDT	Special Weather Statement	CHS	Jasper	48 min
Aug 20, 5:34 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	56 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2010 Every severe thunderstorm warning in 2010

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.