Alert archive / North Carolina / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS Blacksburg, VA

August 16, 2021Surry County, Yadkin County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Aug 16, 2021, 6:38 PM EDT for Surry County, Yadkin County, North Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 16, 2021, 6:38 PM EDT (22:38 UTC)
Expired: Aug 16, 2021, 9:47 PM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Surry County, NC, Yadkin County, NC

The radar

The Roanoke radar (KFCX), 96 km from the middle of the area, began a volume at 22:39 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, 10.6 hours before the alert went out and 66 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: 635 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 503 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

816 
WGUS51 KRNK 162238
FFWRNK
NCC171-197-170445-
/O.NEW.KRNK.FF.W.0028.210816T2238Z-210817T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Blacksburg VA
638 PM EDT Mon Aug 16 2021

The National Weather Service in Blacksburg has issued a

* Flash Flood Warning for...
  Southeastern Surry County in northwestern North Carolina...
  Yadkin County in northwestern North Carolina...

* Until 1245 AM EDT Tuesday.

* At 638 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Elkin...                           Fairview...
  Yadkinville...                     Jonesville...
  Boonville...                       East Bend...
  Nebo...

This includes the following streams and drainages...
  Ararat River, Cranberry Creek, Cody Creek, Elkin Creek, Camp 
  Creek, Deep Creek, Fisher River, Davenport Creek, Cobb Creek, 
  Beaverdam Creek, Bull Creek and Beaver Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3629 8086 3635 8080 3636 8067 3635 8059
      3625 8045 3624 8045 3614 8045 3611 8050
      3609 8051 3609 8052 3608 8052 3610 8067
      3622 8086

FLASH FLOOD...RADAR INDICATED

$$

AS

2 follow-up statements

046 
WGUS71 KRNK 170018
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
818 PM EDT Mon Aug 16 2021

NCC171-197-170445-
/O.CON.KRNK.FF.W.0028.000000T0000Z-210817T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Surry NC-Yadkin NC-
818 PM EDT Mon Aug 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT TUESDAY 
FOR SOUTHEASTERN SURRY AND YADKIN COUNTIES...

At 818 PM EDT, Doppler radar and automated rain gauges indicated 
heavy rain across the warned area. Between 1 and 3 inches of rain 
have fallen. Additional rainfall amounts up to 0.5 inches are 
possible in the warned area. Flash flooding is ongoing or expected 
to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Elkin...                           Fairview...
Yadkinville...                     Jonesville...
Boonville...                       East Bend...
Nebo...

This includes the following streams and drainages...
  Ararat River, Cranberry Creek, Cody Creek, Elkin Creek, Camp 
  Creek, Deep Creek, Fisher River, Davenport Creek, Cobb Creek, 
  Beaverdam Creek, Bull Creek and Beaver Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3629 8086 3635 8080 3636 8067 3635 8059
      3625 8045 3624 8045 3614 8045 3611 8050
      3609 8051 3609 8052 3608 8052 3610 8067
      3622 8086

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

AS

855 
WGUS71 KRNK 170147
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
947 PM EDT Mon Aug 16 2021

NCC171-197-170157-
/O.CAN.KRNK.FF.W.0028.000000T0000Z-210817T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Surry NC-Yadkin NC-
947 PM EDT Mon Aug 16 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN SURRY AND 
YADKIN COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3629 8086 3635 8080 3636 8067 3635 8059
      3625 8045 3624 8045 3614 8045 3611 8050
      3609 8051 3609 8052 3608 8052 3610 8067
      3622 8086

$$

AS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 8:14 PM EDT	Special Weather Statement	RNK	Stokes, Yadkin	31 min
Aug 15, 8:46 PM EDT	Special Weather Statement	RNK	Rockingham, Stokes	29 min
Aug 15, 9:15 PM EDT	Special Weather Statement	RNK	Rockingham	30 min
Aug 15, 9:28 PM EDT	Areal Flood Advisory	RNK	Alleghany, Surry, Wilkes, Yadkin	3 hr
Aug 16, 4:48 PM EDT	Areal Flood Advisory	RNK	Alleghany, Stokes, Surry, Yadkin	5 hr
Aug 16, 5:11 PM EDT	Special Weather Statement	RNK	Yadkin	34 min

Nearby

Flash Flood Warnings in North Carolina, 2021 Every flash 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.