Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS Blacksburg, VA

July 28, 2021Bedford County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Jul 28, 2021, 12:52 AM EDT for Bedford County, Virginia. It was in force for 93 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 28, 2021, 12:52 AM EDT (04:52 UTC)
Expired: Jul 28, 2021, 2:25 AM EDT
In force: 93 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

County Bedford County, VA

The radar

The Roanoke radar (KFCX), 85 km from the middle of the area, began a volume at 04:56 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

Roanoke, VA (KRNK), launched 00:00Z, 4.9 hours before the alert went out and 22 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: 372 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1853 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

635 
WGUS51 KRNK 280452
FFWRNK
VAC019-280745-
/O.NEW.KRNK.FF.W.0025.210728T0452Z-210728T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Blacksburg VA
1252 AM EDT Wed Jul 28 2021

The National Weather Service in Blacksburg has issued a

* Flash Flood Warning for...
  Northeastern Bedford County in south central Virginia...

* Until 345 AM EDT.

* At 1252 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3 inches of 
  rain have fallen. Additional rainfall amounts of 0.5 to 1.5 inches 
  are possible in the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Bedford...                         Forest...
  Goode...                           Sedalia...

This includes the following streams and drainages...
  Buffalo Creek, Big Otter River, Burton Creek and Chestnut Branch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3743 7958 3722 7936 3738 7925 3752 7943

FLASH FLOOD...RADAR INDICATED

$$

SH

1 follow-up statement

803 
WGUS71 KRNK 280625
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
225 AM EDT Wed Jul 28 2021

VAC019-280635-
/O.CAN.KRNK.FF.W.0025.000000T0000Z-210728T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bedford VA-
225 AM EDT Wed Jul 28 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN BEDFORD 
COUNTY...

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

LAT...LON 3743 7958 3722 7936 3738 7925 3752 7943

$$

SH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 10:32 PM EDT	Special Weather Statement	RNK	Bedford	28 min
Jul 27, 10:55 PM EDT	Special Weather Statement	RNK	City of Salem	35 min
Jul 27, 11:04 PM EDT	Special Weather Statement	RNK	Bedford	26 min
Jul 27, 11:22 PM EDT	Special Weather Statement	RNK	Amherst	23 min
Jul 27, 11:35 PM EDT	Special Weather Statement	RNK	Bedford	25 min
Jul 27, 11:50 PM EDT	Severe Thunderstorm Warning	RNK	Amherst	40 min
Jul 27, 11:51 PM EDT	Severe Thunderstorm Warning	RNK	Bedford	54 min
Jul 28, 12:06 AM EDT	Areal Flood Advisory	RNK	Bedford	2 hr
Jul 28, 12:09 AM EDT	Special Weather Statement	RNK	Bedford	36 min
Jul 28, 12:21 AM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell	54 min
Jul 28, 12:31 AM EDT	Special Weather Statement	RNK	Buckingham	29 min
Jul 28, 12:33 AM EDT	Special Weather Statement	RNK	Amherst	27 min
Jul 28, 12:47 AM EDT	Severe Thunderstorm Warning	RNK	Buckingham	43 min
Jul 28, 1:09 AM EDT	Special Weather Statement	RNK	Bedford	51 min
Jul 28, 1:21 AM EDT	Special Weather Statement	RNK	Appomattox	24 min
Jul 28, 1:47 AM EDT	Special Weather Statement	RNK	Appomattox	28 min
Jul 28, 2:14 AM EDT	Special Weather Statement	RNK	Appomattox	31 min

Nearby

Flash Flood Warnings in Virginia, 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.