Alert archive / North Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Raleigh, NC

July 21, 2017Johnston County, Wilson County, North Carolina

NWS Raleigh, NC issued this special weather statement at Jul 21, 2017, 5:36 PM EDT for Johnston County, Wilson County, 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 outline as issued.

The facts

Issued: Jul 21, 2017, 5:36 PM EDT (21:36 UTC)
Expired: Jul 21, 2017, 6:30 PM EDT
In force: 54 min
Issued by: NWS Raleigh, NC

Counties Johnston County, NC, Wilson County, NC

The radar

The Raleigh/Durham radar (KRAX), 38 km from the middle of the area, began a volume at 21:39 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

Roanoke, VA (KRNK), launched 12:00Z, 9.6 hours before the alert went out and 225 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: 10 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 21, 3:37 PM EDT, 1 hour 59 minutes earlier.

Area forecast discussion, Jul 21, 3:37 PM EDT, 1 hour 59 minutes before

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Hazardous weather outlook, Jul 21, 12:01 PM EDT, 5 hours 35 minutes before

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In the hours before

Special weather statement, Jul 21, 4:09 PM EDT, 1 hour 27 minutes before

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Special weather statement, Jul 21, 4:11 PM EDT, 1 hour 25 minutes before

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Special weather statement, Jul 21, 5:36 PM EDT, 0 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 20, 9:27 PM EDT	Heat Advisory	RAH	Chatham, Cumberland, Durham, Edgecombe, Franklin, Halifax and 13 more	23 hr
Jul 21, 3:03 PM EDT	Excessive Heat Watch	RAH	Cumberland, Wake	24 hr
Jul 21, 3:03 PM EDT	Heat Advisory	RAH	Alamance, Anson, Chatham, Davidson, Durham, Edgecombe and 23 more	52 hr
Jul 21, 4:09 PM EDT	Special Weather Statement	RAH	Edgecombe, Halifax, Johnston, Nash, Wilson	66 min
Jul 21, 4:11 PM EDT	Special Weather Statement	RAH	Cumberland	64 min
Jul 21, 4:42 PM EDT	Areal Flood Advisory	RAH	Cumberland	3 hr
Jul 21, 5:50 PM EDT	Special Weather Statement	RAH	Scotland	40 min
Jul 21, 6:09 PM EDT	Special Weather Statement	RAH	Person	66 min
Jul 21, 6:12 PM EDT	Areal Flood Advisory	RAH	Hoke	3 hr

Nearby

Special Weather Statements in North Carolina, 2017 Every special weather statement in 2017

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.