Alert archive / North Carolina / Areal Flood Warnings in 2017

Areal Flood Warning 2, NWS Raleigh, NC

April 24, 20179 counties in North Carolina

NWS Raleigh, NC issued this areal flood warning at Apr 24, 2017, 7:19 PM EDT for 9 counties in North Carolina. It was in force for 6 hr. 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 24, 2017, 7:19 PM EDT (23:19 UTC)
Expired: Apr 25, 2017, 1:15 AM EDT
In force: 6 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Alamance County, NC, Chatham County, NC, Davidson County, NC, Forsyth County, NC, Guilford County, NC, Harnett County, NC, Lee County, NC, Orange County, NC, Randolph County, NC

The radar

The Raleigh/Durham radar (KRAX), 96 km from the middle of the area, began a volume at 23:23 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 12:00Z, 11.3 hours before the alert went out and 268 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: 340 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 604 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood warning went out at Apr 24, 4:20 PM EDT, 2 hours 59 minutes earlier.

Area forecast discussion, Apr 24, 4:20 PM EDT, 2 hours 59 minutes before

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Hazardous weather outlook, Apr 24, 3:53 PM EDT, 3 hours 26 minutes before

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In the hours before

Local storm report, Apr 24, 2:41 PM EDT, 4 hours 38 minutes before

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Special weather statement, Apr 24, 6:08 PM EDT, 1 hour 11 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 24, 5:38 AM EDT	River Flood Warning	RAH	Davidson, Davie	65 hr
Apr 24, 7:52 AM EDT	Areal Flood Advisory	RAH	Cumberland, Harnett, Hoke	3 hr
Apr 24, 9:56 AM EDT	Areal Flood Advisory	RAH	Chatham, Durham, Lee, Orange, Wake	3 hr
Apr 24, 10:37 AM EDT	River Flood Warning	RAH	Anson, Stanly	40 hr
Apr 24, 12:09 PM EDT	Areal Flood Advisory	RAH	Anson, Montgomery, Richmond, Scotland, Stanly	3 hr
Apr 24, 12:34 PM EDT	Areal Flood Advisory	RAH	Davidson, Forsyth	3 hr
Apr 24, 3:33 PM EDT	Areal Flood Advisory	RAH	Alamance, Anson, Chatham, Cumberland, Davidson, Durham and 17 more	4 hr
Apr 24, 6:19 PM EDT	Areal Flood Warning	RAH	Durham, Johnston, Sampson, Wake, Wayne	17 hr
Apr 24, 7:54 PM EDT	Areal Flood Advisory	RAH	Anson, Cumberland, Hoke, Montgomery, Moore, Richmond and 3 more	6 hr

Nearby

Areal Flood Warnings in North Carolina, 2017 Every areal flood warning 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.