Alert archive / North Carolina / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 126, NWS Raleigh, NC

August 21, 2013Franklin County, Wake County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 21, 2013, 5:29 PM EDT for Franklin County, Wake County, North Carolina. It was in force for 61 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: Aug 21, 2013, 5:29 PM EDT (21:29 UTC)
Expired: Aug 21, 2013, 6:30 PM EDT
In force: 61 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Franklin County, NC, Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 30 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 130 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: 1074 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 592 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 21, 2:50 PM EDT, 2 hours 39 minutes earlier.

Area forecast discussion, Aug 21, 2:50 PM EDT, 2 hours 39 minutes before

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Hazardous weather outlook, Aug 21, 4:09 AM EDT, 13 hours 20 minutes before

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In the hours before

Special weather statement, Aug 21, 3:26 PM EDT, 2 hours 3 minutes before

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Special weather statement, Aug 21, 3:43 PM EDT, 1 hour 46 minutes before

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Special weather statement, Aug 21, 4:14 PM EDT, 1 hour 15 minutes before

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Special weather statement, Aug 21, 4:42 PM EDT, 47 minutes before

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Special weather statement, Aug 21, 4:43 PM EDT, 46 minutes before

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Special weather statement, Aug 21, 5:24 PM EDT, 5 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
Aug 21, 3:08 PM EDT	Special Weather Statement	RAH	Alamance, Chatham, Orange	67 min
Aug 21, 3:26 PM EDT	Special Weather Statement	RAH	Guilford	49 min
Aug 21, 3:43 PM EDT	Special Weather Statement	RAH	Alamance	62 min
Aug 21, 4:11 PM EDT	Areal Flood Advisory	RAH	Alamance, Chatham, Durham, Orange	3 hr
Aug 21, 4:14 PM EDT	Special Weather Statement	RAH	Durham, Granville	46 min
Aug 21, 4:42 PM EDT	Special Weather Statement	RAH	Harnett, Wake	63 min
Aug 21, 4:43 PM EDT	Special Weather Statement	RAH	Alamance	62 min
Aug 21, 4:55 PM EDT	Areal Flood Advisory	RAH	Anson	3 hr
Aug 21, 5:12 PM EDT	Areal Flood Advisory	RAH	Chatham, Harnett, Lee, Wake	78 min
Aug 21, 5:24 PM EDT	Special Weather Statement	RAH	Harnett	36 min
Aug 21, 5:50 PM EDT	Areal Flood Advisory	RAH	Moore	100 min
Aug 21, 5:59 PM EDT	Special Weather Statement	RAH	Johnston	46 min
Aug 21, 6:25 PM EDT	Special Weather Statement	RAH	Cumberland, Sampson	50 min
Aug 21, 7:01 PM EDT	Special Weather Statement	RAH	Cumberland, Sampson, Wayne	44 min
Aug 21, 7:30 PM EDT	Areal Flood Advisory	RAH	Sampson	90 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2013 Every severe thunderstorm warning in 2013

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.