Alert archive / North Carolina / Areal Flood Warnings in 2021

Areal Flood Warning 16, NWS Blacksburg, VA

September 22, 2021Surry County, North Carolina

NWS Blacksburg, VA issued this areal flood warning at Sep 22, 2021, 1:41 AM EDT for Surry County, 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
Sep 22, 2021, 1:41 AM EDT (05:41 UTC)
Expired
Sep 22, 2021, 7:30 AM EDT
In force
6 hr
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Flood severity
None

County Surry County, NC

The radar

The Roanoke radar (KFCX), 77 km from the middle of the area, began a volume at 05:42 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, 5.7 hours before the alert went out and 80 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 00:00Z on 2021-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 200 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 00:00Z on 2021-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
200 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
535 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 Blacksburg, VA wrote its last area forecast discussion before this areal flood warning went out at Sep 21, 10:36 PM EDT, 3 hours 5 minutes earlier.

Area forecast discussion, Sep 21, 10:36 PM EDT, 3 hours 5 minutes before
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Hazardous weather outlook, Sep 21, 9:24 PM EDT, 4 hours 17 minutes before
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In the hours before

Special weather statement, Sep 21, 7:41 PM EDT, 6 hours before
Special Weather Statement
National Weather Service BLACKSBURG VA
741 PM EDT Tue Sep 21 2021

VAZ023-024-220015-
Botetourt VA-Rockbridge VA-
741 PM EDT Tue Sep 21 2021

...An area of heavy rain showers will impact portions of southern
Rockbridge and northern Botetourt Counties, including the City of
Lexington through 815 PM EDT...

At 739 PM EDT, Doppler radar was tracking an area of heavy rain
showers from near Natural Bridge to Buchanan...moving northeast at
25 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Lexington...
Buchanan...
Eagle Rock...
Collierstown...
Arcadia...
Springwood...
Natural Bridge...
Interstate 81 between mile-markers 160 and 185.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

&&

LAT...LON 3781 7930 3748 7972 3759 7987 3778 7972
      3776 7968 3777 7966 3785 7961 3787 7964
      3787 7965 3797 7957
TIME...MOT...LOC 2339Z 217DEG 21KT 3768 7964

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

RAB
Local storm report, Sep 22, 12:08 AM EDT, 1 hour 33 minutes before
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Local storm report, Sep 22, 12:11 AM EDT, 1 hour 30 minutes before
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Local storm report, Sep 22, 12:12 AM EDT, 1 hour 29 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 21, 8:07 PM EDTAreal Flood AdvisoryRNKFloyd, Franklin3 hr
Sep 21, 9:00 PM EDTAreal Flood AdvisoryRNKFloyd, Franklin, Montgomery, Roanoke, City of Roanoke, City of Salem3 hr
Sep 21, 9:34 PM EDTAreal Flood AdvisoryRNKCarroll, Floyd, Patrick3 hr
Sep 21, 10:10 PM EDTFlash Flood WarningRNKCarroll, Floyd, Patrick6 hr
Sep 21, 10:19 PM EDTAreal Flood AdvisoryRNKFloyd, Patrick3 hr
Sep 21, 11:25 PM EDTAreal Flood AdvisoryRNKFloyd, Franklin3 hr
Sep 21, 11:56 PM EDTAreal Flood AdvisoryRNKCarroll, Floyd, Montgomery, Pulaski, City of Radford6 hr
Sep 22, 12:20 AM EDTFlash Flood WarningRNKFloyd, Patrick4 hr
Sep 22, 1:00 AM EDTFlash Flood WarningRNKFranklin, Roanoke, City of Roanoke, City of Salem3 hr
Sep 22, 1:12 AM EDTFlash Flood WarningRNKMontgomery6 hr
Sep 22, 2:27 AM EDTFlash Flood WarningRNKCraig, Giles6 hr
Sep 22, 5:03 AM EDTAreal Flood AdvisoryRNKFloyd, Franklin, Henry, Patrick3 hr
Sep 22, 11:00 AM EDTAreal Flood AdvisoryRNKBedford, Botetourt, Floyd, Franklin, Henry, Patrick and 7 more11 hr
Sep 22, 1:35 PM EDTSpecial Weather StatementRNKCity of Martinsville25 min
Sep 22, 2:02 PM EDTSpecial Weather StatementRNKAmherst28 min
Sep 22, 2:52 PM EDTAreal Flood AdvisoryRNKCraig, Giles, Montgomery, Pulaski, City of Radford2 hr
Sep 22, 3:38 PM EDTSpecial Weather StatementRNKFloyd, Montgomery22 min
Sep 22, 4:01 PM EDTSpecial Weather StatementRNKPatrick29 min
Sep 22, 4:20 PM EDTSpecial Weather StatementRNKPatrick40 min
Sep 22, 4:27 PM EDTSevere Thunderstorm WarningRNKPatrick33 min
Sep 22, 4:35 PM EDTSpecial Weather StatementRNKFranklin40 min
Sep 22, 4:47 PM EDTSpecial Weather StatementRNKRockbridge, City of Buena Vista, City of Lexington28 min
Sep 22, 4:53 PM EDTFlash Flood WarningRNKBedford, Franklin, Patrick, Roanoke4 hr
Sep 22, 5:32 PM EDTFlash Flood WarningRNKBedford, Botetourt, Rockbridge, City of Buena Vista, City of Lexington3 hr
Sep 22, 7:10 PM EDTAreal Flood WarningRNKRockbridge2 hr
Sep 22, 7:19 PM EDTAreal Flood AdvisoryRNKAmherst3 hr
Sep 22, 3:55 AM EDTAreal Flood AdvisoryRNKStokes3 hr
Sep 22, 3:48 PM EDTSpecial Weather StatementRNKStokes27 min
Sep 22, 4:08 PM EDTAreal Flood AdvisoryRNKStokes, Surry2 hr
Sep 22, 4:59 PM EDTFlash Flood WarningRNKStokes, Surry, Yadkin84 min

Nearby

Areal Flood Warnings in North Carolina, 2021Every areal flood warning 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.