Alert archive / North Carolina / Areal Flood Advisories in 2021

Areal Flood Advisory 111, NWS Raleigh, NC

October 29, 20214 counties in North Carolina

NWS Raleigh, NC issued this areal flood advisory at Oct 29, 2021, 4:16 AM EDT for 4 counties in North Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Oct 29, 2021, 4:16 AM EDT (08:16 UTC)
Expired: Oct 29, 2021, 6:52 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Durham County, NC, Harnett County, NC, Johnston County, NC, Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 18 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 118 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: 567 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 447 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Oct 29, 4:09 AM EDT, 7 minutes earlier.

Area forecast discussion, Oct 29, 4:09 AM EDT, 7 minutes before

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Hazardous weather outlook, Oct 29, 3:14 AM EDT, 1 hour 2 minutes before

Hazardous Weather Outlook
National Weather Service Raleigh NC
314 AM EDT Fri Oct 29 2021

NCZ007>011-021>028-038>043-073>078-083>086-088-089-300715-
Person-Granville-Vance-Warren-Halifax-Forsyth-Guilford-Alamance-
Orange-Durham-Franklin-Nash-Edgecombe-Davidson-Randolph-Chatham-Wake-
Johnston-Wilson-Stanly-Montgomery-Moore-Lee-Harnett-Wayne-Anson-
Richmond-Scotland-Hoke-Cumberland-Sampson-
314 AM EDT Fri Oct 29 2021

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 29, 8:28 AM EDT	Special Weather Statement	RAH	Forsyth	47 min
Oct 29, 8:36 AM EDT	Special Weather Statement	RAH	Nash, Warren, Wilson	39 min
Oct 29, 9:34 AM EDT	Special Weather Statement	RAH	Forsyth	26 min
Oct 29, 2:08 PM EDT	Special Weather Statement	RAH	Edgecombe	52 min
Oct 29, 2:52 PM EDT	Special Weather Statement	RAH	Halifax	23 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.