Alert archive / Georgia / Areal Flood Advisories in 2021

Areal Flood Advisory 113, NWS Charleston, SC

September 22, 2021Beaufort County, Jasper County, South Carolina; 4 counties in Georgia

NWS Charleston, SC issued this areal flood advisory at Sep 22, 2021, 6:55 PM EDT for Beaufort County, Jasper County, South Carolina; 4 counties in Georgia. It was in force for 64 min.

The area

The counties it named.

The facts

Issued: Sep 22, 2021, 6:55 PM EDT (22:55 UTC)
Expired: Sep 22, 2021, 7:59 PM EDT
In force: 64 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Bryan County, GA, Chatham County, GA, Liberty County, GA, McIntosh County, GA, Beaufort County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 73 km from the middle of the area, began a volume at 22:56 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, 10.9 hours before the alert went out and 149 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: 773 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -1 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 areal flood advisory 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 areal flood advisory went out at Sep 22, 3:45 PM EDT, 3 hours 10 minutes earlier.

Area forecast discussion, Sep 22, 3:45 PM EDT, 3 hours 10 minutes before

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Hazardous weather outlook, Sep 22, 3:22 AM EDT, 15 hours 33 minutes before

Hazardous Weather Outlook
National Weather Service Charleston SC
322 AM EDT Wed Sep 22 2021

AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040-
042>045-047>052-230730-
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-Coastal Bryan-Inland Chatham-Coastal Chatham-Long-
Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh-
Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley-
Inland Jasper-Beaufort-Coastal Colleton-Charleston-Coastal Jasper-
Tidal Berkeley-
322 AM EDT Wed Sep 22 2021

This Hazardous Weather Outlook is for Atlantic coastal waters,
southeast Georgia and southeast South Carolina.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

In the hours before

Special weather statement, Sep 22, 5:41 PM EDT, 1 hour 14 minutes before

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Special weather statement, Sep 22, 6:05 PM EDT, 50 minutes before

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Special weather statement, Sep 22, 6:14 PM EDT, 41 minutes before

Special Weather Statement
National Weather Service Charleston SC
614 PM EDT Wed Sep 22 2021

SCZ044-045-222245-
Inland Berkeley-Dorchester-
614 PM EDT Wed Sep 22 2021

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BERKELEY AND
DORCHESTER COUNTIES...

At 614 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Saint George to
8 miles northeast of Dorchester, and moving east at 10 mph.

HAZARD...excessive cloud to ground lightning.

SOURCE...Radar Indicated.

IMPACT...All outdoor activities should cease. Move indoors
         immediately.

Some locations in the path of these storms include...
Saint George, Dorchester, Ridgeville, Harleyville and Reevesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.

Excessive cloud to ground lightning is occurring with these storms.
Lightning can strike 15 miles away from a thunderstorm. Seek safe
shelter inside a building or vehicle.

Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.

&&

LAT...LON 3313 8003 3306 8059 3306 8061 3321 8071
      3328 8048 3326 8043 3327 8039 3326 8036
      3328 8035 3327 8030 3330 8025 3334 8025
      3336 8023
TIME...MOT...LOC 2214Z 253DEG 10KT 3315 8058 3323 8028

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<45 MPH

Special weather statement, Sep 22, 6:33 PM EDT, 22 minutes before

Special Weather Statement
National Weather Service Charleston SC
633 PM EDT Wed Sep 22 2021

GAZ116-137-138-140-222245-
Inland McIntosh-Inland Liberty-Inland Bryan-Long-
633 PM EDT Wed Sep 22 2021

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN, LIBERTY,
MCINTOSH AND LONG COUNTIES...

At 633 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near McIntosh to
near Gardi, and moving east at 30 mph.

HAZARD...excessive cloud to ground lightning.

SOURCE...Radar Indicated.

IMPACT...All outdoor activities should cease. Move indoors
         immediately.

Some locations in the path of these storms include...
Tibet, Jones, Walthourville, Midway, Riceboro, Flemington, Allenhurst
and Eulonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.

Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.

&&

LAT...LON 3139 8157 3145 8162 3147 8161 3151 8166
      3154 8166 3155 8169 3158 8170 3162 8176
      3182 8157 3177 8127 3176 8126 3172 8127
      3137 8151
TIME...MOT...LOC 2233Z 249DEG 27KT 3181 8149 3157 8173

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<45 MPH

Special weather statement, Sep 22, 6:44 PM EDT, 11 minutes before

Special Weather Statement
National Weather Service Charleston SC
644 PM EDT Wed Sep 22 2021

GAZ116>119-137>141-SCZ047-051-222330-
Inland McIntosh-Coastal Liberty-Inland Liberty-Coastal Chatham-Inland
Chatham-Inland Bryan-Coastal McIntosh-Coastal Bryan-Long-Inland
Jasper-Coastal Jasper-
644 PM EDT Wed Sep 22 2021

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN, LIBERTY,
MCINTOSH, CHATHAM, LONG AND JASPER COUNTIES...

At 644 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Hardeeville to
near Midway to 6 miles southwest of Tibet, and moving east at 15 mph.

HAZARD...excessive cloud to ground lightning.

SOURCE...Radar Indicated.

IMPACT...All outdoor activities should cease. Move indoors
         immediately.

Some locations in the path of these storms include...
Pooler, Bluffton, Richmond Hill, Tybee Island, Darien, Tibet,
Bellinger Hill Area and Savannah International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.

Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.

&&

LAT...LON 3129 8139 3138 8155 3154 8167 3207 8133
      3223 8114 3235 8105 3235 8093 3230 8094
      3230 8100 3222 8101 3217 8095 3212 8096
      3214 8091 3208 8091 3210 8085 3196 8083
      3171 8110 3162 8110 3140 8122 3130 8124
TIME...MOT...LOC 2244Z 274DEG 14KT 3225 8110 3184 8142 3153 8165

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<45 MPH

Special weather statement, Sep 22, 6:46 PM EDT, 9 minutes before

Special Weather Statement
National Weather Service Charleston SC
646 PM EDT Wed Sep 22 2021

SCZ042>045-047>049-051-222330-
Inland Berkeley-Coastal Colleton-Inland Jasper-Coastal
Jasper-Hampton-Beaufort-Inland Colleton-Dorchester-
646 PM EDT Wed Sep 22 2021

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BEAUFORT, HAMPTON,
COLLETON, BERKELEY, DORCHESTER AND JASPER COUNTIES...

At 645 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Canadys to near
Yemassee to near Sheldon, and moving northeast at 20 mph.

HAZARD...excessive cloud to ground lightning.

SOURCE...Radar Indicated.

IMPACT...All outdoor activities should cease. Move indoors
         immediately.

Some locations in the path of these storms include...
Beaufort, Walterboro, Yemassee, Givhans Ferry State Park, Dorchester,
Clarendon, Ridgeville and Cottageville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.

Excessive cloud to ground lightning is occurring with these storms.
Lightning can strike 15 miles away from a thunderstorm. Seek safe
shelter inside a building or vehicle.

&&

LAT...LON 3335 8021 3287 8041 3281 8041 3276 8045
      3274 8045 3271 8042 3252 8043 3247 8090
      3272 8095 3311 8070 3326 8039 3326 8036
      3328 8035 3327 8030 3330 8025 3333 8025
TIME...MOT...LOC 2245Z 245DEG 19KT 3307 8069 3272 8088 3254 8085

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<45 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 4:48 PM EDT	Special Weather Statement	CHS	Allendale	27 min
Sep 22, 5:27 PM EDT	Special Weather Statement	CHS	Jasper	33 min
Sep 22, 5:41 PM EDT	Special Weather Statement	CHS	Dorchester	34 min
Sep 22, 6:14 PM EDT	Special Weather Statement	CHS	Dorchester	31 min
Sep 22, 6:46 PM EDT	Special Weather Statement	CHS	Colleton, Dorchester	44 min
Sep 22, 7:13 PM EDT	Areal Flood Advisory	CHS	Berkeley, Dorchester	62 min
Sep 22, 7:36 PM EDT	Special Weather Statement	CHS	Colleton	24 min
Sep 22, 5:02 PM EDT	Special Weather Statement	CHS	Effingham	28 min
Sep 22, 6:05 PM EDT	Special Weather Statement	CHS	Bryan, Liberty	40 min
Sep 22, 6:33 PM EDT	Special Weather Statement	CHS	McIntosh	12 min
Sep 22, 6:44 PM EDT	Special Weather Statement	CHS	Chatham, Liberty, McIntosh	46 min
Sep 22, 7:29 PM EDT	Special Weather Statement	CHS	McIntosh	46 min

Nearby

Areal Flood Advisories in Georgia, 2021 Areal Flood Advisories in South Carolina, 2021 Every areal flood advisory 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.