Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 62, NWS Blacksburg, VA

August 13, 2011Surry County, Yadkin County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Aug 13, 2011, 8:13 PM EDT for Surry County, Yadkin County, North Carolina. 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 13, 2011, 8:13 PM EDT (00:13 UTC)
Expired: Aug 13, 2011, 11:10 PM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Surry County, NC, Yadkin County, NC

The radar

The Roanoke radar (KFCX), 92 km from the middle of the area, began a volume at 00:15 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.2 hours before the alert went out and 71 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: 1747 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 718 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

428 
WGUS51 KRNK 140013
FFWRNK
NCC171-197-140615-
/O.NEW.KRNK.FF.W.0062.110814T0013Z-110814T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
813 PM EDT SAT AUG 13 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL YADKIN COUNTY IN NORTHWEST NORTH CAROLINA
  SOUTH CENTRAL SURRY COUNTY IN NORTH CENTRAL NORTH CAROLINA

* UNTIL 215 AM EDT SUNDAY.

* AT 806 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKFORD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3629 8069 3632 8063 3622 8060 3622 8065
      3623 8071

$$

DS

2 follow-up statements

187 
WGUS71 KRNK 140139
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
939 PM EDT SAT AUG 13 2011

NCC171-197-140615-
/O.CON.KRNK.FF.W.0062.000000T0000Z-110814T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
YADKIN NC-SURRY NC-
939 PM EDT SAT AUG 13 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM EDT FOR
NORTHERN YADKIN AND SOUTHERN SURRY COUNTIES...

AT 933 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT HEAVY RAIN HAS MOVED OUT OF THE WARNED AREA. HOWEVER...THE 
THREAT OF FLASH FLOODING HAS NOT ENDED. RUN OFF FROM THE EARLIER 
RAIN STILL HAS THE POTENTIAL OF PRODUCING FLASH FLOODING ALONG 
TRIBUTARIES OF THE YADKIN RIVER UPSTREAM OF ROCKFORD.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKFORD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3629 8069 3632 8063 3622 8060 3622 8065
      3623 8071

$$

DS

714 
WGUS71 KRNK 140310
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1110 PM EDT SAT AUG 13 2011

NCC171-197-140320-
/O.CAN.KRNK.FF.W.0062.000000T0000Z-110814T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
YADKIN NC-SURRY NC-
1110 PM EDT SAT AUG 13 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN YADKIN AND
SOUTHERN SURRY COUNTIES...

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

LAT...LON 3629 8069 3632 8063 3622 8060 3622 8065
      3623 8071

$$

PH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 8:21 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	54 min
Aug 13, 8:57 PM EDT	Flash Flood Warning	RNK	Yadkin	3 hr
Aug 13, 9:09 PM EDT	Special Weather Statement	RNK	Yadkin	51 min
Aug 14, 1:21 AM EDT	Special Weather Statement	RNK	Ashe	54 min
Aug 14, 4:14 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham, Stokes	61 min
Aug 14, 5:03 PM EDT	Special Weather Statement	RNK	Rockingham	42 min
Aug 14, 5:36 PM EDT	Special Weather Statement	RNK	Caswell, Rockingham	54 min
Aug 14, 5:51 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry	54 min
Aug 14, 6:43 PM EDT	Special Weather Statement	RNK	Stokes, Surry	62 min
Aug 14, 7:28 PM EDT	Special Weather Statement	RNK	Yadkin	62 min

Nearby

Flash Flood Warnings in North Carolina, 2011 Every 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.