Alert archive / North Carolina / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 121, NWS Raleigh, NC

May 11, 20085 counties in North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at May 11, 2008, 8:34 PM EDT for 5 counties in North Carolina. It was in force for 41 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: May 11, 2008, 8:34 PM EDT (00:34 UTC)
Expired: May 11, 2008, 9:15 PM EDT
In force: 41 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Alamance County, NC, Chatham County, NC, Davidson County, NC, Guilford County, NC, Randolph County, NC

The radar

The Raleigh/Durham radar (KRAX), 111 km from the middle of the area, began a volume at 00:37 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 11, 7:47 PM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.6 hours before the alert went out and 30 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: 256 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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 Raleigh, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 11, 8:19 PM EDT, 15 minutes earlier.

Area forecast discussion, May 11, 8:19 PM EDT, 15 minutes before

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Hazardous weather outlook, May 11, 8:04 PM EDT, 30 minutes before

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In the hours before

Local storm report, May 11, 6:12 PM EDT, 2 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
612 PM EDT SUN MAY 11 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0555 PM     TSTM WND DMG     5 NE GLENVIEW           36.21N 77.75W
05/11/2008                   HALIFAX            NC   PUBLIC

            ONE TREE REPORTED DOWN NEAR I-95 BETWEEN EXIT 150 AND
            156.

&&

BSD

Local storm report, May 11, 6:19 PM EDT, 2 hours 15 minutes before

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Local storm report, May 11, 6:21 PM EDT, 2 hours 13 minutes before

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Local storm report, May 11, 6:49 PM EDT, 1 hour 45 minutes before

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Local storm report, May 11, 7:18 PM EDT, 1 hour 16 minutes before

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Local storm report, May 11, 7:20 PM EDT, 1 hour 14 minutes before

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The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 11, 10:06 PM EDT	Severe Thunderstorm Warning	RAH	Harnett, Johnston, Wayne, Wilson	54 min
May 12, 4:06 AM EDT	Wind Advisory	RAH	Davidson, Forsyth, Guilford, Person, Randolph	11 hr

Nearby

Severe Thunderstorm Warnings in North Carolina, 2008 Every severe thunderstorm warning in 2008

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.