Alert archive / North Carolina / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 110, NWS Raleigh, NC

August 1, 2013Durham County, Orange County, Person County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 1, 2013, 10:48 PM EDT for Durham County, Orange County, Person County, North Carolina. It was in force for 42 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 1, 2013, 10:48 PM EDT (02:48 UTC)
Expired: Aug 1, 2013, 11:30 PM EDT
In force: 42 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Durham County, NC, Orange County, NC, Person County, NC

The radar

The Raleigh/Durham radar (KRAX), 71 km from the middle of the area, began a volume at 02:51 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 00:00Z, 2.8 hours before the alert went out and 82 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: 1673 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.2
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 Aug 1, 10:23 PM EDT, 25 minutes earlier.

Area forecast discussion, Aug 1, 10:23 PM EDT, 25 minutes before

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Hazardous weather outlook, Aug 1, 9:36 PM EDT, 1 hour 12 minutes before

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In the hours before

Special weather statement, Aug 1, 9:25 PM EDT, 1 hour 23 minutes before

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Special weather statement, Aug 1, 10:26 PM EDT, 22 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 1, 9:25 PM EDT	Special Weather Statement	RAH	Person	65 min
Aug 1, 10:26 PM EDT	Special Weather Statement	RAH	Person	64 min
Aug 1, 10:51 PM EDT	Areal Flood Advisory	RAH	Person	3 hr
Aug 1, 11:25 PM EDT	Special Weather Statement	RAH	Durham, Granville	50 min
Aug 1, 11:53 PM EDT	Special Weather Statement	RAH	Person	52 min
Aug 1, 11:59 PM EDT	Special Weather Statement	RAH	Alamance	46 min
Aug 2, 12:34 AM EDT	Special Weather Statement	RAH	Wake	26 min
Aug 2, 12:49 AM EDT	Special Weather Statement	RAH	Alamance, Orange	41 min
Aug 2, 2:16 AM EDT	Special Weather Statement	RAH	Wake	59 min
Aug 2, 2:31 AM EDT	Areal Flood Advisory	RAH	Wake	3 hr

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.