Alert archive / South Carolina / Areal Flood Warnings in 2017

Areal Flood Warning 2, NWS Charleston, SC

September 11, 20174 counties in South Carolina; 4 counties in Georgia

NWS Charleston, SC issued this areal flood warning at Sep 11, 2017, 5:16 PM EDT for 4 counties in South Carolina; 4 counties in Georgia. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 11, 2017, 5:16 PM EDT (21:16 UTC)
Expired: Sep 12, 2017, 12:15 AM EDT
In force: 7 hr
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Flood severity: None

Counties Bulloch County, GA, Chatham County, GA, Effingham County, GA, Screven County, GA, Allendale County, SC, Beaufort County, SC, Hampton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 26 km from the middle of the area, began a volume at 21:14 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, 9.3 hours before the alert went out and 125 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 902 m²/s²
0-3 km storm-relative helicity: 1081 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 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 areal flood warning went out at Sep 11, 4:33 PM EDT, 43 minutes earlier.

Area forecast discussion, Sep 11, 4:33 PM EDT, 43 minutes before

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Hazardous weather outlook, Sep 11, 4:34 PM EDT, 42 minutes before

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In the hours before

Local storm report, Sep 11, 4:24 PM EDT, 52 minutes before

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Local storm report, Sep 11, 4:31 PM EDT, 45 minutes before

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Local storm report, Sep 11, 4:41 PM EDT, 35 minutes before

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Local storm report, Sep 11, 4:44 PM EDT, 32 minutes before

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Local storm report, Sep 11, 4:45 PM EDT, 31 minutes before

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Local storm report, Sep 11, 4:51 PM EDT, 25 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
Sep 10, 11:30 PM EDT	Hurricane Warning	CHS		9 hr
Sep 11, 3:12 AM EDT	Special Marine Warning	CHS		2 hr
Sep 11, 3:12 AM EDT	Special Marine Warning	CHS		63 min
Sep 11, 3:49 AM EDT	Special Marine Warning	CHS		56 min
Sep 11, 4:19 AM EDT	Special Marine Warning	CHS		86 min
Sep 11, 5:18 AM EDT	Special Marine Warning	CHS		117 min
Sep 11, 7:01 AM EDT	Special Marine Warning	CHS		119 min
Sep 11, 7:41 AM EDT	Special Marine Warning	CHS		2 hr
Sep 11, 7:45 AM EDT	Special Marine Warning	CHS		2 hr
Sep 11, 8:16 AM EDT	Flash Flood Warning	CHS	Jasper	8 hr
Sep 11, 8:36 AM EDT	Areal Flood Advisory	CHS	Beaufort, Jasper	84 min
Sep 11, 9:22 AM EDT	Flash Flood Warning	CHS	Beaufort, Jasper	8 hr
Sep 11, 9:31 AM EDT	Areal Flood Advisory	CHS	Allendale, Hampton, Jasper	119 min
Sep 11, 9:41 AM EDT	Special Marine Warning	CHS		2 hr
Sep 11, 9:50 AM EDT	Special Marine Warning	CHS		115 min
Sep 11, 10:31 AM EDT	Special Marine Warning	CHS		119 min
Sep 11, 10:44 AM EDT	Flash Flood Warning	CHS	Allendale, Hampton, Jasper	7 hr
Sep 11, 10:45 AM EDT	River Flood Warning	CHS	Berkeley, Georgetown, Williamsburg	24 hr
Sep 11, 11:24 AM EDT	Flash Flood Warning Emergency	CHS	Berkeley, Charleston, Colleton, Dorchester	15 hr
Sep 11, 11:38 AM EDT	Special Marine Warning	CHS		2 hr
Sep 11, 11:44 AM EDT	Areal Flood Advisory	CHS	Allendale	2 hr
Sep 11, 11:51 AM EDT	Areal Flood Advisory	CHS	Allendale, Colleton, Dorchester, Hampton	114 min
Sep 11, 12:01 PM EDT	Tornado Warning	CHS	Beaufort, Charleston, Colleton	29 min
Sep 11, 12:23 PM EDT	Special Marine Warning	CHS		2 hr
Sep 11, 12:37 PM EDT	Tornado Warning	CHS	Charleston	23 min
Sep 11, 12:40 PM EDT	Special Marine Warning	CHS		65 min
Sep 11, 12:54 PM EDT	Flash Flood Warning	CHS	Allendale, Colleton, Dorchester, Hampton	9 hr
Sep 11, 12:59 PM EDT	Tornado Warning	CHS	Charleston, Dorchester	31 min
Sep 11, 1:10 PM EDT	Tornado Warning	CHS	Charleston, Colleton	35 min
Sep 11, 1:49 PM EDT	Tornado Warning	CHS	Charleston, Colleton, Dorchester	26 min
Sep 11, 1:53 PM EDT	Tornado Warning	CHS	Charleston, Dorchester	24 min
Sep 11, 2:11 PM EDT	Special Marine Warning	CHS		94 min
Sep 11, 2:45 PM EDT	Tornado Warning	CHS	Beaufort, Colleton	30 min
Sep 11, 2:46 PM EDT	Tornado Warning	CHS	Berkeley, Charleston, Dorchester	16 min
Sep 11, 3:10 PM EDT	Flash Flood Warning	CHS	Berkeley, Colleton, Dorchester	7 hr
Sep 11, 3:58 PM EDT	Special Marine Warning	CHS		32 min
Sep 11, 4:43 PM EDT	Special Marine Warning	CHS		62 min
Sep 11, 4:48 PM EDT	Areal Flood Warning	CHS	Jasper	7 hr
Sep 10, 10:28 PM EDT	River Flood Warning	CHS	Evans	4 days
Sep 10, 10:28 PM EDT	River Flood Warning	CHS	Tattnall, Toombs	5 days
Sep 11, 6:22 AM EDT	Flash Flood Warning	CHS	McIntosh	10 hr
Sep 11, 10:11 AM EDT	Tornado Warning	CHS	Bryan, Chatham, Liberty	15 min

Nearby

Areal Flood Warnings in South Carolina, 2017 Areal Flood Warnings in Georgia, 2017 Every areal flood warning in 2017

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.