Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 33, NWS Blacksburg, VA

August 28, 2021Amherst County, Rockbridge County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Aug 28, 2021, 11:49 PM EDT for Amherst County, Rockbridge County, Virginia. 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 outline as issued.

The facts

Issued: Aug 28, 2021, 11:49 PM EDT (03:49 UTC)
Expired: Aug 29, 2021, 6:00 AM EDT
In force: 6 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Amherst County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 132 km from the middle of the area, began a volume at 03:51 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, 3.8 hours before the alert went out and 74 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: 210 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 2017 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

238 
WGUS51 KRNK 290349
FFWRNK
VAC009-163-291000-
/O.NEW.KRNK.FF.W.0033.210829T0349Z-210829T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Blacksburg VA
1149 PM EDT Sat Aug 28 2021

The National Weather Service in Blacksburg has issued a

* Flash Flood Warning for...
  Northeastern Amherst County in central Virginia...
  Northeastern Rockbridge County in west central Virginia...

* Until 600 AM EDT Sunday.

* At 1149 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. 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...
  Rockbridge Baths...                Fairfield...
  Cornwall...                        Brownsburg...
  Vesuvius...                        Alto...
  Lowesville...

This includes the following streams and drainages...
  Irish Creek, Little Calfpasture River, Hays Creek, Buffalo River, 
  Big Marys Creek, Falling Run, Davis Mill Creek, Alone Mill Creek, 
  Dry Branch and Cedar Grove Branch.

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 3779 7934 3793 7948 3803 7938 3790 7918
      3789 7915 3786 7915 3786 7914 3784 7916
      3782 7916 3779 7917 3781 7914 3779 7911
      3779 7909 3777 7906 3776 7906 3772 7906
      3771 7903 3770 7900 3770 7898 3769 7898

FLASH FLOOD...RADAR INDICATED

$$

RR

2 follow-up statements

697 
WGUS71 KRNK 290530
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
130 AM EDT Sun Aug 29 2021

VAC009-163-291000-
/O.CON.KRNK.FF.W.0033.000000T0000Z-210829T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Amherst VA-Rockbridge VA-
130 AM EDT Sun Aug 29 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM EDT EARLY THIS 
MORNING FOR NORTHEASTERN AMHERST AND NORTHEASTERN ROCKBRIDGE 
COUNTIES...

At 130 AM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 6 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.

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...
  Rockbridge Baths...                Fairfield...
Cornwall...                        Brownsburg...
Vesuvius...                        Alto...
Lowesville...

This includes the following streams and drainages...
  Irish Creek, Little Calfpasture River, Hays Creek, Buffalo River, 
  Big Marys Creek, Falling Run, Davis Mill Creek, Alone Mill Creek, 
  Dry Branch and Cedar Grove Branch.

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 3779 7934 3793 7948 3803 7938 3790 7918
      3789 7915 3786 7915 3786 7914 3784 7916
      3782 7916 3779 7917 3781 7914 3779 7911
      3779 7909 3777 7906 3776 7906 3772 7906
      3771 7903 3770 7900 3770 7898 3769 7898

FLASH FLOOD...RADAR INDICATED

$$

RR

923 
WGUS71 KRNK 290955
FFSRNK

Flash Flood Statement
National Weather Service Blacksburg VA
555 AM EDT Sun Aug 29 2021

VAC009-163-291005-
/O.EXP.KRNK.FF.W.0033.000000T0000Z-210829T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Amherst VA-Rockbridge VA-
555 AM EDT Sun Aug 29 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 6 AM EDT EARLY THIS MORNING 
FOR NORTHEASTERN AMHERST AND NORTHEASTERN ROCKBRIDGE 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.

LAT...LON 3779 7934 3793 7948 3803 7938 3790 7918
      3789 7915 3786 7915 3786 7914 3784 7916
      3782 7916 3779 7917 3781 7914 3779 7911
      3779 7909 3777 7906 3776 7906 3772 7906
      3771 7903 3770 7900 3770 7898 3769 7898

$$

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 9:01 PM EDT	Special Weather Statement	RNK	Rockbridge	29 min
Aug 28, 9:33 PM EDT	Special Weather Statement	RNK	City of Buena Vista	42 min
Aug 28, 10:22 PM EDT	Special Weather Statement	RNK	Buckingham	38 min
Aug 28, 10:28 PM EDT	Special Weather Statement	RNK	City of Buena Vista	32 min
Aug 28, 10:57 PM EDT	Special Weather Statement	RNK	Rockbridge	33 min
Aug 28, 11:05 PM EDT	Areal Flood Advisory	RNK	Rockbridge	3 hr
Aug 28, 11:09 PM EDT	Special Weather Statement	RNK	Buckingham	36 min
Aug 28, 11:11 PM EDT	Special Weather Statement	RNK	Buckingham	49 min
Aug 28, 11:27 PM EDT	Special Weather Statement	RNK	Rockbridge	48 min
Aug 28, 11:30 PM EDT	Special Weather Statement	RNK	Appomattox	30 min
Aug 28, 11:38 PM EDT	Areal Flood Advisory	RNK	Rockbridge	3 hr
Aug 28, 11:44 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Rockbridge	43 min
Aug 28, 11:51 PM EDT	Special Weather Statement	RNK	Amherst	24 min
Aug 29, 12:02 AM EDT	Special Weather Statement	RNK	Appomattox	43 min
Aug 29, 12:05 AM EDT	Special Weather Statement	RNK	Buckingham	40 min
Aug 29, 12:07 AM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, Buckingham	53 min
Aug 29, 12:23 AM EDT	Special Weather Statement	RNK	Amherst	37 min
Aug 29, 12:30 AM EDT	Severe Thunderstorm Warning	RNK	Amherst, Bedford	60 min
Aug 29, 12:39 AM EDT	Areal Flood Advisory	RNK	Amherst, Appomattox, Bedford	3 hr
Aug 29, 12:59 AM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox	61 min
Aug 29, 1:41 AM EDT	Special Weather Statement	RNK	Appomattox	34 min
Aug 29, 2:00 PM EDT	Special Weather Statement	RNK	Bath	30 min
Aug 29, 2:18 PM EDT	Special Weather Statement	RNK	Bath	27 min
Aug 29, 2:21 PM EDT	Special Weather Statement	RNK	Alleghany	24 min
Aug 29, 2:50 PM EDT	Severe Thunderstorm Warning	RNK	Bath, Rockbridge	55 min
Aug 29, 3:23 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, Botetourt	67 min
Aug 29, 3:39 PM EDT	Severe Thunderstorm Warning	RNK	Bath, Rockbridge	51 min
Aug 29, 3:48 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	27 min
Aug 29, 4:01 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, City of Covington	44 min
Aug 29, 4:19 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Lexington	26 min
Aug 29, 4:33 PM EDT	Special Weather Statement	RNK	City of Covington	27 min
Aug 29, 4:42 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, Craig	44 min
Aug 29, 5:24 PM EDT	Special Weather Statement	RNK	Giles	36 min
Aug 29, 5:30 PM EDT	Special Weather Statement	RNK	Montgomery	30 min
Aug 29, 6:03 PM EDT	Special Weather Statement	RNK	Montgomery	27 min
Aug 29, 6:11 PM EDT	Special Weather Statement	RNK	Giles	19 min
Aug 29, 6:17 PM EDT	Special Weather Statement	RNK	Giles	28 min
Aug 29, 6:41 PM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	34 min
Aug 29, 6:42 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	33 min
Aug 29, 6:57 PM EDT	Areal Flood Advisory	RNK	Montgomery	3 hr
Aug 29, 7:02 PM EDT	Severe Thunderstorm Warning	RNK	Giles	27 min
Aug 29, 7:03 PM EDT	Areal Flood Advisory	RNK	Roanoke, City of Roanoke, City of Salem	117 min
Aug 29, 7:16 PM EDT	Special Weather Statement	RNK	Floyd, Montgomery, Roanoke, City of Roanoke, City of Salem	44 min
Aug 29, 7:40 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	35 min
Aug 29, 7:55 PM EDT	Special Weather Statement	RNK	Floyd	35 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.