Alert archive / North Carolina / Flash Flood Warnings in 2021

Flash Flood Warning 41, NWS Blacksburg, VA

September 22, 2021Stokes County, Surry County, Yadkin County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Sep 22, 2021, 4:59 PM EDT for Stokes County, Surry County, Yadkin County, North Carolina. It was in force for 84 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 22, 2021, 4:59 PM EDT (20:59 UTC)
Expired: Sep 22, 2021, 6:23 PM EDT
In force: 84 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Stokes County, NC, Surry County, NC, Yadkin County, NC

The radar

The Roanoke radar (KFCX), 72 km from the middle of the area, began a volume at 21:03 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.

What was reported inside it

Time	Report	Where	Remark
Sep 22, 6:00 PM EDT	FLASH FLOOD	3 Nnw Ararat, NC	FLOODING FROM STONEY CREEK FORCED RESIDENTS TO LEAVE THEIR HOME ON CHRISTY LANE. HIATT ROAD WAS CLOSE DUE TO FLOODING FROM STONEY CREEK. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.0 hours before the alert went out and 63 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: 410 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 516 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

555 
WGUS51 KRNK 222059
FFWRNK
NCC169-171-197-230000-
/O.NEW.KRNK.FF.W.0041.210922T2059Z-210923T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Blacksburg VA
459 PM EDT Wed Sep 22 2021

The National Weather Service in Blacksburg has issued a

* Flash Flood Warning for...
  Northwestern Stokes County in north central North Carolina...
  Eastern Surry County in northwestern North Carolina...
  North Central Yadkin County in northwestern North Carolina...

* Until 800 PM EDT.

* At 459 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. The expected rainfall rate is 4 
  inches in 1 hour. 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...
  Mount Airy...                      Fairview...
  Flat Rock...                       Pilot Mountain...
  Francisco...                       Ararat...
  Pilot Mountain State Park...

This includes the following streams and drainages...
  Ararat River, Big Creek, Archies 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.

When it is safe to do so, please send your reports of flooding, 
including mudslides or flooded roads, to the National Weather 
Service by calling toll free at 1...8 6 6...2 1 5...4 3 2 4. Reports 
and pictures can also be shared on the National Weather Service 
Blacksburg Facebook page and on Twitter.

&&

LAT...LON 3654 8054 3654 8031 3654 8029 3654 8025
      3626 8045 3626 8048 3626 8052 3626 8068
      3627 8078

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...4 INCHES IN 1 HOUR

$$

WP

1 follow-up statement

257 
WGUS71 KRNK 222223
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
623 PM EDT Wed Sep 22 2021

NCC169-171-197-222233-
/O.CAN.KRNK.FF.W.0041.000000T0000Z-210923T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Stokes NC-Surry NC-Yadkin NC-
623 PM EDT Wed Sep 22 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN STOKES, EASTERN 
SURRY AND NORTH CENTRAL YADKIN COUNTIES...

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

A Flash Flood Watch remains in effect until 800 AM EDT Thursday for 
portions of north central North Carolina and Virginia.

LAT...LON 3654 8054 3654 8031 3654 8029 3654 8025
      3626 8045 3626 8048 3626 8052 3626 8068
      3627 8078

$$

BMG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 9:34 PM EDT	Areal Flood Advisory	RNK	Stokes, Surry	3 hr
Sep 21, 10:10 PM EDT	Flash Flood Warning	RNK	Surry	6 hr
Sep 22, 1:41 AM EDT	Areal Flood Warning	RNK	Surry	6 hr
Sep 22, 3:55 AM EDT	Areal Flood Advisory	RNK	Stokes	3 hr
Sep 22, 3:48 PM EDT	Special Weather Statement	RNK	Stokes	27 min
Sep 22, 4:08 PM EDT	Areal Flood Advisory	RNK	Stokes, Surry	2 hr
Sep 22, 4:27 PM EDT	Severe Thunderstorm Warning	RNK	Stokes	33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.