Alert archive / North Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 138, NWS Raleigh, NC

August 1, 20207 counties in North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Aug 1, 2020, 12:51 AM EDT for 7 counties in North Carolina. It was in force for 54 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, 2020, 12:51 AM EDT (04:51 UTC)
Expired: Aug 1, 2020, 1:45 AM EDT
In force: 54 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Edgecombe County, NC, Franklin County, NC, Johnston County, NC, Nash County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC

The radar

The Raleigh/Durham radar (KRAX), 36 km from the middle of the area, began a volume at 04:55 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

Newport, NC (KMHX), launched 00:00Z, 4.9 hours before the alert went out and 157 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: 2017 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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 Jul 31, 9:21 PM EDT, 3 hours 30 minutes earlier.

Area forecast discussion, Jul 31, 9:21 PM EDT, 3 hours 30 minutes before

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Hazardous weather outlook, Jul 31, 7:01 PM EDT, 5 hours 50 minutes before

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In the hours before

Special weather statement, Jul 31, 9:03 PM EDT, 3 hours 48 minutes before

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Special weather statement, Jul 31, 9:05 PM EDT, 3 hours 46 minutes before

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Special weather statement, Jul 31, 9:56 PM EDT, 2 hours 55 minutes before

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Special weather statement, Jul 31, 10:07 PM EDT, 2 hours 44 minutes before

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Special weather statement, Aug 1, 12:06 AM EDT, 45 minutes before

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Special weather statement, Aug 1, 12:36 AM EDT, 15 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
Jul 31, 9:03 PM EDT	Special Weather Statement	RAH	Halifax	42 min
Jul 31, 9:05 PM EDT	Special Weather Statement	RAH	Person, Vance, Warren	40 min
Jul 31, 9:56 PM EDT	Special Weather Statement	RAH	Davidson, Forsyth	64 min
Jul 31, 10:07 PM EDT	Special Weather Statement	RAH	Granville, Person	53 min
Aug 1, 12:06 AM EDT	Special Weather Statement	RAH	Orange	54 min
Aug 1, 12:32 AM EDT	Severe Thunderstorm Warning	RAH	Durham, Granville, Orange, Person, Wake	43 min
Aug 1, 12:36 AM EDT	Special Weather Statement	RAH	Wilson	54 min
Aug 1, 3:55 AM EDT	Heat Advisory	RAH	Chatham, Cumberland, Edgecombe, Franklin, Halifax, Harnett and 12 more	14 hr
Aug 1, 12:42 PM EDT	Special Weather Statement	RAH	Johnston	63 min
Aug 1, 1:46 PM EDT	Special Weather Statement	RAH	Wayne	59 min
Aug 1, 1:58 PM EDT	Special Weather Statement	RAH	Franklin	62 min
Aug 1, 3:42 PM EDT	Special Weather Statement	RAH	Wayne	63 min
Aug 1, 4:01 PM EDT	Special Weather Statement	RAH	Franklin	59 min
Aug 1, 4:07 PM EDT	Special Weather Statement	RAH	Johnston, Wilson	53 min
Aug 1, 4:16 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Johnston, Nash, Wake, Wilson	59 min
Aug 1, 4:25 PM EDT	Special Weather Statement	RAH	Harnett	35 min
Aug 1, 4:44 PM EDT	Special Weather Statement	RAH	Wake	46 min
Aug 1, 4:56 PM EDT	Special Weather Statement	RAH	Warren	49 min
Aug 1, 4:59 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Harnett, Wake	33 min
Aug 1, 5:23 PM EDT	Special Weather Statement	RAH	Durham, Granville, Orange, Person	67 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2020 Every severe thunderstorm warning in 2020

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.