Alert archive / North Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 96, NWS Raleigh, NC

September 9, 2021Halifax County, North Carolina

NWS Raleigh, NC issued this areal flood advisory at Sep 9, 2021, 2:33 PM EDT for Halifax County, North Carolina. It was in force for 92 min.

The area

The counties it named.

The facts

Issued: Sep 9, 2021, 2:33 PM EDT (18:33 UTC)
Expired: Sep 9, 2021, 4:05 PM EDT
In force: 92 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

County Halifax County, NC

The radar

The Norfolk radar (KAKQ), 99 km from the middle of the area, began a volume at 18:32 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, 6.6 hours before the alert went out and 195 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 798 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -112 m²/s²
0-3 km storm-relative helicity: -81 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 areal flood advisory 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 advisory went out at Sep 9, 1:32 PM EDT, 1 hour 1 minute earlier.

Area forecast discussion, Sep 9, 1:32 PM EDT, 1 hour 1 minute before

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Hazardous weather outlook, Sep 9, 12:15 PM EDT, 2 hours 18 minutes before

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In the hours before

Local storm report, Sep 9, 11:43 AM EDT, 2 hours 50 minutes before

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Local storm report, Sep 9, 12:05 PM EDT, 2 hours 28 minutes before

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Special weather statement, Sep 9, 12:11 PM EDT, 2 hours 22 minutes before

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Special weather statement, Sep 9, 12:20 PM EDT, 2 hours 13 minutes before

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Special weather statement, Sep 9, 1:08 PM EDT, 1 hour 25 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
Sep 8, 8:02 PM EDT	Special Weather Statement	RAH	Warren	58 min
Sep 9, 10:29 AM EDT	Areal Flood Advisory	RAH	Moore	3 hr
Sep 9, 11:21 AM EDT	Flash Flood Warning Considerable damage threat	RAH	Wake	3 hr
Sep 9, 12:11 PM EDT	Special Weather Statement	RAH	Warren	64 min
Sep 9, 12:20 PM EDT	Special Weather Statement	RAH	Wake	55 min
Sep 9, 12:51 PM EDT	Areal Flood Advisory	RAH	Vance, Warren	3 hr
Sep 9, 1:08 PM EDT	Special Weather Statement	RAH	Wake	67 min
Sep 9, 2:46 PM EDT	Special Weather Statement	RAH	Edgecombe, Wilson	59 min

Nearby

Areal Flood Advisories in North Carolina, 2021 Every areal flood advisory in 2021

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.