Alert archive / Virginia / Flash Flood Warnings in 2007

Flash Flood Warning 13, NWS Blacksburg, VA

July 10, 2007Pittsylvania County, City of Danville, Virginia

NWS Blacksburg, VA issued this flash flood warning at Jul 10, 2007, 1:56 PM EDT for Pittsylvania County, City of Danville, Virginia. It was in force for 4 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 10, 2007, 1:56 PM EDT (17:56 UTC)
Expired: Jul 10, 2007, 6:00 PM EDT
In force: 4 hr
Issued by: NWS Blacksburg, VA
Area: Counties, with a storm outline in the text
Flood severity: None

Counties City of Danville, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 82 km from the middle of the area, began a volume at 17:59 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 10, 2:20 PM EDT	FLASH FLOOD	Danville City, VA	LONG BRANCH AND APPLE BRANCH CREEKS COMING OUT OF THIER BANKS

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, 5.9 hours before the alert went out and 63 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: 636 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1038 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KRNK 101757
FFWRNK
VAC143-590-102200-
/X.NEW.KRNK.FF.W.0013.070710T1756Z-070710T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
156 PM EDT TUE JUL 10 2007

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CITY OF DANVILLE IN SOUTH CENTRAL VIRGINIA
  SOUTHERN PITTSYLVANIA COUNTY IN SOUTH CENTRAL VIRGINIA

* UNTIL 600 PM EDT

* AT 155 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM SLOW MOVING THUNDERSTORMS ACROSS SOUTHERN     
  PITTSYLVANIA COUNTY. RADAR ESTIMATED ONE TO FOUR INCHES OF RAIN    
  HAS FALLEN....FROM SWANSONVILLE TO DANVILLE TO RINGGOLD.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WESTOVER
  HILLS...SWANSONVILLE...SANDY RIVER...RINGGOLD...KEELING...DRY FORK
  AND BLAIRS

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO 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 REPORTS OF FLOODING TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1...8 6 6...2 1 5...4 3 2 4.

LAT...LON 3656 7970 3655 7922 3676 7917 3675 7966

$$

PH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 1:00 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania, City of Danville	75 min
Jul 10, 1:07 PM EDT	Severe Thunderstorm Warning	RNK	Buckingham	68 min
Jul 10, 1:20 PM EDT	Areal Flood Advisory	RNK	Pittsylvania, City of Danville	3 hr
Jul 10, 1:53 PM EDT	Areal Flood Advisory	RNK	Buckingham	6 hr
Jul 10, 2:04 PM EDT	Areal Flood Advisory	RNK	Amherst	6 hr
Jul 10, 2:19 PM EDT	Flash Flood Warning	RNK	Buckingham	3 hr
Jul 10, 5:01 PM EDT	Severe Thunderstorm Warning	RNK	Rockbridge, City of Lexington	74 min
Jul 10, 6:05 PM EDT	Flash Flood Warning	RNK	Alleghany, City of Covington	3 hr
Jul 10, 6:08 PM EDT	Flash Flood Warning	RNK	Roanoke, City of Roanoke	3 hr
Jul 10, 6:36 PM EDT	Flash Flood Warning	RNK	Rockbridge	3 hr

Nearby

Flash Flood Warnings in Virginia, 2007 Every flash flood warning in 2007

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.