Alert archive / North Carolina / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 51, NWS Raleigh, NC

April 12, 2008Forsyth County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Apr 12, 2008, 9:15 AM EDT for Forsyth County, North Carolina. It was in force for 30 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: Apr 12, 2008, 9:15 AM EDT (13:15 UTC)
Expired: Apr 12, 2008, 9:45 AM EDT
In force: 30 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

County Forsyth County, NC

The radar

The Roanoke radar (KFCX), 99 km from the middle of the area, began a volume at 13:16 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 1.3 hours before the alert went out and 32 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: 201 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 Apr 12, 7:38 AM EDT, 1 hour 37 minutes earlier.

Area forecast discussion, Apr 12, 7:38 AM EDT, 1 hour 37 minutes before

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Hazardous weather outlook, Apr 12, 4:41 AM EDT, 4 hours 34 minutes before

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In the hours before

Special weather statement, Apr 12, 8:57 AM EDT, 18 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
Apr 12, 2:30 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Johnston, Sampson	45 min
Apr 12, 3:08 PM EDT	Tornado Warning	RAH	Johnston, Wayne, Wilson	32 min
Apr 12, 3:27 PM EDT	Severe Thunderstorm Warning	RAH	Edgecombe, Halifax	25 min

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.