Alert archive / North Carolina / Areal Flood Advisories in 2020

Areal Flood Advisory 21, NWS Blacksburg, VA

May 19, 2020Ashe County, Watauga County, Wilkes County, North Carolina

NWS Blacksburg, VA issued this areal flood advisory at May 19, 2020, 4:44 PM EDT for Ashe County, Watauga County, Wilkes County, North Carolina. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 19, 2020, 4:44 PM EDT (20:44 UTC)
Expired: May 19, 2020, 8:45 PM EDT
In force: 4 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Ashe County, NC, Watauga County, NC, Wilkes County, NC

The radar

The Roanoke radar (KFCX), 133 km from the middle of the area, began a volume at 20:44 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 12:00Z, 8.7 hours before the alert went out and 141 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 486 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 311 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 Blacksburg, VA wrote its last area forecast discussion before this areal flood advisory went out at May 19, 2:18 PM EDT, 2 hours 26 minutes earlier.

Area forecast discussion, May 19, 2:18 PM EDT, 2 hours 26 minutes before

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Hazardous weather outlook, May 19, 2:28 PM EDT, 2 hours 16 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 1:28 AM EDT	Areal Flood Advisory	RNK	Bedford, Botetourt, Franklin, Roanoke, City of Roanoke	6 hr
May 19, 3:43 AM EDT	Wind Advisory	RNK	Smyth, Tazewell	24 hr
May 19, 4:10 AM EDT	Areal Flood Advisory	RNK	Henry, Patrick, City of Martinsville	6 hr
May 19, 7:21 AM EDT	Areal Flood Advisory	RNK	Bedford, Botetourt, Franklin, Roanoke, City of Roanoke	4 hr
May 18, 8:37 PM EDT	Special Weather Statement	RNK	Ashe	53 min
May 18, 10:50 PM EDT	Special Weather Statement	RNK	Watauga	55 min
May 19, 12:34 AM EDT	Areal Flood Advisory	RNK	Watauga	3 hr
May 19, 3:54 AM EDT	Areal Flood Warning	RNK	Watauga	6 hr
May 19, 4:01 AM EDT	Areal Flood Advisory	RNK	Ashe, Wilkes	6 hr
May 19, 6:55 PM EDT	Areal Flood Advisory	RNK	Watauga	4 hr

Nearby

Areal Flood Advisories in North Carolina, 2020 Every areal flood advisory 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.