Alert archive / South Carolina / Lake Wind Advisories in 2017

Lake Wind Advisory 14, NWS Columbia, SC

September 11, 201716 counties in South Carolina; 5 counties in Georgia

NWS Columbia, SC issued this lake wind advisory at Sep 11, 2017, 8:54 PM EDT for 16 counties in South Carolina; 5 counties in Georgia. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Sep 11, 2017, 8:54 PM EDT (00:54 UTC)
Expired: Sep 12, 2017, 2:00 AM EDT
In force: 5 hr
Issued by: NWS Columbia, SC

All 21 counties

Burke County, GA, Columbia County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Edgefield County, SC, Fairfield County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 28 km from the middle of the area, began a volume at 00:54 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, 0.9 hours before the alert went out and 162 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: 458 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 383 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this lake wind advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this lake wind advisory went out at Sep 11, 5:19 PM EDT, 3 hours 35 minutes earlier.

Area forecast discussion, Sep 11, 5:19 PM EDT, 3 hours 35 minutes before

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Hazardous weather outlook, Sep 11, 7:10 PM EDT, 1 hour 44 minutes before

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In the hours before

Local storm report, Sep 11, 4:47 PM EDT, 4 hours 7 minutes before

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Local storm report, Sep 11, 4:55 PM EDT, 3 hours 59 minutes before

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Local storm report, Sep 11, 5:00 PM EDT, 3 hours 54 minutes before

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Local storm report, Sep 11, 5:01 PM EDT, 3 hours 53 minutes before

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Local storm report, Sep 11, 5:37 PM EDT, 3 hours 17 minutes before

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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Sep 11, 6:45 PM EDT, 2 hours 9 minutes before

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      </p>
      <p id="message2">
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 8:09 PM EDT	Areal Flood Advisory	CAE	Calhoun, Lexington, Richland, Sumter	3 hr
Sep 11, 11:29 PM EDT	Areal Flood Advisory	CAE	Aiken, Lexington, Saluda	2 hr
Sep 12, 2:45 AM EDT	Flash Flood Warning	CAE	Richland	90 min

Nearby

Lake Wind Advisories in South Carolina, 2017 Lake Wind Advisories in Georgia, 2017 Every lake wind advisory 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.