Alert archive / Virginia / Flash Flood Warnings in 2013

Flash Flood Warning 39, NWS Blacksburg, VA

July 20, 20134 counties in Virginia

NWS Blacksburg, VA issued this flash flood warning at Jul 20, 2013, 6:47 PM EDT for 4 counties in Virginia. It was in force for 3 hr. 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: Jul 20, 2013, 6:47 PM EDT (22:47 UTC)
Expired: Jul 20, 2013, 9:45 PM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Amherst County, VA, Appomattox County, VA, Campbell County, VA, City of Lynchburg, VA

The radar

The Roanoke radar (KFCX), 113 km from the middle of the area, began a volume at 22:49 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
Jul 20, 8:00 PM EDT	FLASH FLOOD	2 Ene Stonewall, VA	LITTLE WRECK ISLAND CREEK FLOODED

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

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 10.8 hours before the alert went out and 43 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: 1163 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 555 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

082 
WGUS51 KRNK 202247
FFWRNK
VAC009-011-031-680-210145-
/O.NEW.KRNK.FF.W.0039.130720T2247Z-130721T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
647 PM EDT SAT JUL 20 2013

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CITY OF LYNCHBURG IN CENTRAL VIRGINIA... 
  EXTREME NORTHEASTERN CAMPBELL COUNTY IN CENTRAL VIRGINIA...
  APPOMATTOX COUNTY IN CENTRAL VIRGINIA...
  EXTREME SOUTHERN AMHERST COUNTY IN CENTRAL VIRGINIA...

* UNTIL 945 PM EDT

* AT 640 PM EDT...DOPPLER RADAR INDICATED THAT PERSISTENT THUNDERSTORMS
  HAVE DUMPED EXCESSIVE RAINFALL ACROSS THE WARNED AREA...WITH OVER 
  FOUR INCHES OF RAIN HAVING FALLEN NEAR STONEWALL...WITH 2 TO 3 INCHES
  ACROSS MUCH OF THE REMAINING WARNED AREA. ADDITIONAL RAINFALL OF 1 TO
  3 INCHES IS POSSIBLE IN THESE AREAS DURING THE NEXT TWO HOURS. 
  FLASH FLOODING IN THIS AREA IS LIKELY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LYNCHBURG CITY...
  CONCORD...
  APPOMATTOX...
  MADISON HEIGHTS...
  AND STONEWALL. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...AS WELL AS NEARBY COUNTRY ROADS AND FARMLAND. IF
YOU ENCOUNTER A WATER COVERED ROAD...TURN AROUND DON'T DROWN!
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD MOVE TO HIGHER
GROUND NOW.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE THE WATER COVERS THE ROAD. THE WATER MAY BE TOO DEEP
TO ALLOW YOUR CAR TO CROSS SAFELY. TURN AROUND DONT DROWN. NEVER TRY
TO CROSS A FLOWING STREAM ON FOOT.

WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF FLOODING...
INCLUDING MUDSLIDES OR ROAD CLOSURES...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 3730 7882 3734 7927 3739 7924 3741 7925
      3743 7925 3743 7927 3745 7926 3745 7924
      3746 7922 3750 7876 3747 7873
$$

RAB

2 follow-up statements

335 
WGUS71 KRNK 210005
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
805 PM EDT SAT JUL 20 2013

VAC009-031-680-210011-
/O.CAN.KRNK.FF.W.0039.000000T0000Z-130721T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CITY OF LYNCHBURG VA-CAMPBELL VA-AMHERST VA-
805 PM EDT SAT JUL 20 2013

...THE FLASH FLOOD WARNING FOR
CITY OF LYNCHBURG COUNTY...
NORTHEASTERN CAMPBELL COUNTY...
AND SOUTHEASTERN AMHERST COUNTY IS CANCELLED...

RAINFALL ENDED IN THESE AREAS SOONER THAN EXPECTED. RAINFALL OF 
2 TO 3 INCHES WAS COMMON THROUGH THIS AREA DURING THE AFTERNOON...
BUT ADDITIONAL RAINFALL IS NOT IMMINENT. A FEW LOW-LYING AND NORMALLY
FLOOD PRONE AREAS MAY EXPERIENCE HIGH WATER YET FOR A COUPLE MORE 
HOURS.

LAT...LON 3730 7882 3731 7895 3738 7899 3743 7902
      3744 7901 3748 7897 3748 7894 3750 7876
      3747 7873

VAC011-210145-
/O.CON.KRNK.FF.W.0039.000000T0000Z-130721T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
APPOMATTOX VA-
805 PM EDT SAT JUL 20 2013

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM EDT FOR
CENTRAL APPOMATTOX COUNTY IN CENTRAL VIRGINIA...

AT 801 PM EDT...DOPPLER RADAR INDICATED THAT RAINFALL 
HAS ENDED IN THE WARNED AREA. HOWEVER...OVER 4 INCHES 
OF RAIN LIKELY FELL IN PARTS OF NORTHERN APPOMATTOX 
COUNTY NEAR STONEWALL IN LESS THAN TWO HOURS.. THIS 
EXCESSIVE RAINFALL WILL RESULT IN CONSIDERABLE RUNOFF INT
AREA CREEKS AND STREAMS...AS WELL AS DRAINAGE DITCHES. SOME
CREEKS AND STREAMS WILL BE NEAR BANKFUL DURING THE NEXT
FEW HOURS UNTIL THE WATER HAS A CHANCE TO RECEDE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
APPOMATTOX...
STONEWALL...
OAKVILLE...
AND SPOUT SPRING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...AS WELL AS NEARBY COUNTRY ROADS AND FARMLAND. IF
YOU ENCOUNTER A WATER COVERED ROAD...TURN AROUND DON'T DROWN!
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD MOVE TO HIGHER
GROUND NOW.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE THE WATER COVERS THE ROAD. THE WATER MAY BE TOO DEEP
TO ALLOW YOUR CAR TO CROSS SAFELY. TURN AROUND DONT DROWN. NEVER TRY
TO CROSS A FLOWING STREAM ON FOOT.

WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF FLOODING...
INCLUDING MUDSLIDES OR ROAD CLOSURES...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 3730 7882 3731 7895 3738 7899 3743 7902
      3744 7901 3748 7897 3748 7894 3750 7876
      3747 7873

$$

RAB

204 
WGUS71 KRNK 210119
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
919 PM EDT SAT JUL 20 2013

VAC011-210128-
/O.CAN.KRNK.FF.W.0039.000000T0000Z-130721T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
APPOMATTOX VA-
919 PM EDT SAT JUL 20 2013

...THE FLASH FLOOD WARNING FOR
AND CENTRAL APPOMATTOX COUNTY IS CANCELLED...

THE HEAVY RAIN AND THUNDERSTORMS THAT EARLIER PROMPTED THE WARNING
HAVE ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A THREAT AT THIS TIME.
THUS...THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3730 7882 3731 7895 3738 7899 3743 7902
      3744 7901 3748 7897 3748 7894 3750 7876
      3747 7873

$$

RAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 9:19 AM EDT	Special Weather Statement	RNK	Grayson	56 min
Jul 20, 1:20 PM EDT	Special Weather Statement	RNK	City of Martinsville	55 min
Jul 20, 2:12 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	48 min
Jul 20, 2:46 PM EDT	Special Weather Statement	RNK	Campbell	29 min
Jul 20, 3:07 PM EDT	Special Weather Statement	RNK	Rockbridge	23 min
Jul 20, 3:27 PM EDT	Special Weather Statement	RNK	Campbell	33 min
Jul 20, 3:57 PM EDT	Special Weather Statement	RNK	City of Buena Vista	18 min
Jul 20, 4:41 PM EDT	Special Weather Statement	RNK	Pulaski	64 min
Jul 20, 4:57 PM EDT	Special Weather Statement	RNK	Halifax	63 min
Jul 20, 5:15 PM EDT	Areal Flood Advisory	RNK	Pulaski	60 min
Jul 20, 5:25 PM EDT	Special Weather Statement	RNK	Appomattox, City of Lynchburg	50 min
Jul 20, 5:34 PM EDT	Special Weather Statement	RNK	Giles	41 min
Jul 20, 5:44 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox	61 min
Jul 20, 5:59 PM EDT	Severe Thunderstorm Warning	RNK	Buckingham	46 min
Jul 20, 6:32 PM EDT	Special Weather Statement	RNK	Appomattox	58 min
Jul 20, 7:09 PM EDT	Special Weather Statement	RNK	Bath	66 min

Nearby

Flash Flood Warnings in Virginia, 2013 Every flash flood warning in 2013

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.