Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 304, NWS Greenville-Spartanburg, SC

July 27, 2009Davie County, Iredell County, Rowan County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 27, 2009, 1:50 PM EDT for Davie County, Iredell County, Rowan County, North Carolina. It was in force for 55 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: Jul 27, 2009, 1:50 PM EDT (17:50 UTC)
Expired: Jul 27, 2009, 2:45 PM EDT
In force: 55 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

Counties Davie County, NC, Iredell County, NC, Rowan County, NC

The radar

The Roanoke radar (KFCX), 141 km from the middle of the area, began a volume at 17:52 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, 5.8 hours before the alert went out and 327 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: 1073 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1130 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 3:41 AM EDT, 10 hours 9 minutes earlier.

Area forecast discussion, Jul 27, 3:41 AM EDT, 10 hours 9 minutes before

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Hazardous weather outlook, Jul 27, 5:09 AM EDT, 8 hours 41 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 26, 9:05 PM EDT	Severe Thunderstorm Warning	GSP	Cleveland, Gaston, Lincoln	49 min
Jul 27, 2:33 PM EDT	Severe Thunderstorm Warning	GSP	Henderson, Polk, Rutherford	57 min
Jul 27, 3:15 PM EDT	Severe Thunderstorm Warning	GSP	Henderson	39 min
Jul 27, 3:20 PM EDT	Severe Thunderstorm Warning	GSP	Transylvania	55 min
Jul 27, 3:36 PM EDT	Severe Thunderstorm Warning	GSP	Caldwell	54 min
Jul 27, 7:09 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus, Mecklenburg, Union	53 min
Jul 27, 7:23 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus	51 min
Jul 26, 8:58 PM EDT	Severe Thunderstorm Warning	GSP	Cherokee, Spartanburg, Union	67 min
Jul 27, 2:05 PM EDT	Severe Thunderstorm Warning	GSP	Pickens	55 min
Jul 27, 2:55 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Spartanburg	65 min
Jul 27, 4:03 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Laurens, Spartanburg	46 min
Jul 27, 7:16 PM EDT	Severe Thunderstorm Warning	GSP	Chester, Union	59 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2009 Every severe thunderstorm warning in 2009

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.