Alert archive / South Carolina / Flash Flood Warnings in 2019

Flash Flood Warning 1, NWS Charleston, SC

September 5, 2019Berkeley County, Charleston County, Dorchester County, South Carolina

NWS Charleston, SC issued this flash flood warning at Sep 5, 2019, 4:27 AM EDT for Berkeley County, Charleston County, Dorchester County, South Carolina. It was in force for 11 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 5, 2019, 4:27 AM EDT (08:27 UTC)
Expired: Sep 5, 2019, 3:41 PM EDT
In force: 11 hr
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Flood severity: None

Counties Berkeley County, SC, Charleston County, SC, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 96 km from the middle of the area, began a volume at 08:26 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, 8.5 hours before the alert went out and 15 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: 352 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 452 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash 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 flash flood warning went out at Sep 5, 3:39 AM EDT, 48 minutes earlier.

Area forecast discussion, Sep 5, 3:39 AM EDT, 48 minutes before

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Hazardous weather outlook, Sep 4, 5:29 PM EDT, 10 hours 58 minutes before

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In the hours before

Local storm report, Sep 5, 12:53 AM EDT, 3 hours 34 minutes before

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Local storm report, Sep 5, 1:26 AM EDT, 3 hours 1 minute before

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Local storm report, Sep 5, 1:31 AM EDT, 2 hours 56 minutes before

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Local storm report, Sep 5, 2:10 AM EDT, 2 hours 17 minutes before

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Local storm report, Sep 5, 2:59 AM EDT, 1 hour 28 minutes before

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Local storm report, Sep 5, 3:49 AM EDT, 38 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 5, 10:37 AM EDT	River Flood Warning	CHS	Berkeley, Georgetown, Williamsburg	5 hr
Sep 5, 1:57 PM EDT	Small Craft Advisory	CHS		14 hr
Sep 5, 2:11 PM EDT	Wind Advisory	CHS		5 hr

Nearby

Flash Flood Warnings in South Carolina, 2019 Every flash flood warning in 2019

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.