Alert archive / Virginia / Flash Flood Warnings in 2011

Flash Flood Warning 70, NWS Blacksburg, VA

August 27, 2011Buckingham County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Aug 27, 2011, 5:43 PM EDT for Buckingham County, Virginia. 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 27, 2011, 5:43 PM EDT (21:43 UTC)
Expired
Aug 27, 2011, 9:00 PM EDT
In force
3 hr
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Flood severity
None

County Buckingham County, VA

The radar

The Norfolk radar (KAKQ), 146 km from the middle of the area, began a volume at 21:46 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 12:00Z, 9.7 hours before the alert went out and 98 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-pSkew-T log-p diagram, Roanoke, VA at 12:00Z on 2011-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 77 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 12:00Z on 2011-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
77 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
655 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

949 
WGUS51 KRNK 272143
FFWRNK
VAC029-280345-
/O.NEW.KRNK.FF.W.0070.110827T2143Z-110828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
543 PM EDT SAT AUG 27 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BUCKINGHAM COUNTY IN CENTRAL VIRGINIA

* UNTIL 1145 PM EDT.

* AT 537 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN FROM CONTINUOUS RAIN BANDS MOVING OVER THE WARNED 
AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GOLD HILL  
AND CENTENARY.  CREEKS AFFECTED MAY INCLUDE MUDDY CREEK...HORSEPEN 
CREEK...LITTLE GEORGIA CREEK AND SHARPS CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

PLEASE RELAY ANY REPORTS OF FLOODING INCLUDING MUDSLIDES...OR ROAD
CLOSURES TO THE NATIONAL WEATHER SERVICE IN BLACKSBURG BY CALLING
TOLL FREE...1...8 6 6...2 1 5...4 3 2 4. DELAYED REPORTS ARE WELCOME.

&&

LAT...LON 3751 7835 3734 7850 3739 7859 3740 7859
      3739 7861 3742 7864 3743 7868 3775 7858
      3776 7851 3778 7849 3774 7842 3771 7832
      3767 7826

$$

PC
2 follow-up statements
308 
WGUS71 KRNK 272257
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
657 PM EDT SAT AUG 27 2011

VAC029-280345-
/O.CON.KRNK.FF.W.0070.000000T0000Z-110828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKINGHAM VA-
657 PM EDT SAT AUG 27 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FOR
BUCKINGHAM COUNTY...

AT 653 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE PERIODS OF MODERATE TO HEAVY RAIN MOVING OVER THE WARNED 
AREA.

THE HEAVIEST RAIN HAS FALLEN SOUTH OF CENTENARY IN THE MUDDY AND
TURPIN CREEK BASINS WHERE RADAR HAS ESTIMATED UP TO 5 INCHES OF RAIN.
HOWEVER...RAIN GAGE REPORTS FROM THE AREA ARE MUCH LOWER SO IT IS 
LIKELY THAT RADAR IS OVERESTIMATING CONSIDERABLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3751 7835 3734 7850 3739 7859 3740 7859
      3739 7861 3742 7864 3743 7868 3775 7858
      3776 7851 3778 7849 3774 7842 3771 7832
      3767 7826

$$

PC
213 
WGUS71 KRNK 280100
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
900 PM EDT SAT AUG 27 2011

VAC029-280110-
/O.CAN.KRNK.FF.W.0070.000000T0000Z-110828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUCKINGHAM VA-
900 PM EDT SAT AUG 27 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BUCKINGHAM
COUNTY...

FLOODING HAS ENDED OVER THE WARNED AREA...THUS THE FLASH FLOOD
WARNING HAS BEEN CANCELLED.

LAT...LON 3751 7835 3734 7850 3739 7859 3740 7859
      3739 7861 3742 7864 3743 7868 3775 7858
      3776 7851 3778 7849 3774 7842 3771 7832
      3767 7826

$$

PC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 3:56 AM EDTSpecial Weather StatementRNKHalifax79 min
Aug 27, 4:55 AM EDTWind AdvisoryRNKAmherst, Appomattox, Bedford, Buckingham, Campbell, Charlotte and 7 more16 hr
Aug 27, 2:30 PM EDTSpecial Weather StatementRNKAppomattox, Buckingham, Charlotte, Halifax90 min

Nearby

Flash Flood Warnings in Virginia, 2011Every flash flood warning in 2011

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.