Alert archive / Virginia / Flash Flood Warnings in 2012
Flash Flood Warning 50, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood warning at Sep 5, 2012, 7:19 PM EDT for Botetourt County, Roanoke County, Virginia. It was in force for 96 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2012, 7:19 PM EDT (23:19 UTC)
- Expired
- Sep 5, 2012, 8:55 PM EDT
- In force
- 96 min
- Issued by
- NWS Blacksburg, VA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Botetourt County, VA, Roanoke County, VA
The radar
The Roanoke radar (KFCX), 52 km from the middle of the area, began a volume at 23:21 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, 11.3 hours before the alert went out and 38 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.
- Mixed-layer CAPE
- 608 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
852
WGUS51 KRNK 052319
FFWRNK
VAC023-161-060215-
/O.NEW.KRNK.FF.W.0050.120905T2319Z-120906T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
719 PM EDT WED SEP 5 2012
THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN ROANOKE COUNTY IN WEST CENTRAL VIRGINIA
SOUTHWESTERN BOTETOURT COUNTY IN WEST CENTRAL VIRGINIA
* UNTIL 1015 PM EDT.
* AT 712 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM THUNDERSTORMS PERSISTING OVER THE WARNED AREA.
DOPPLER RADAR INDICATES THAT RAINFALL OVER 2.0 INCHES MAY HAVE
FALLEN IN PARTS OF NORTHEAST ROANOKE AND WESTERN BOTETOURT COUNTY
DURING THE PAST HOUR...AND ADDITIONAL THUNDERSTORMS ARE DEVELOPING
IN NORTHEAST ROANOKE COUNTY POISED TO MOVE INTO THE FLASH FLOOD
WARNING AREA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CATAWBA...
TROUTVILLE...NACE...DALEVILLE AND BLUE RIDGE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. FLOODING ALONG
INTERSTATE 81 BETWEEN MILE MARKERS 145 AND 155 IS LIKELY.
IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
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 3746 7974 3744 7973 3740 7981 3737 7978
3732 7985 3727 7986 3728 7989 3731 7988
3733 7997 3731 8001 3738 8017 3744 8002
$$
RAB2 follow-up statements
603
WGUS71 KRNK 060003
FFSRNK
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
803 PM EDT WED SEP 5 2012
VAC023-161-060215-
/O.CON.KRNK.FF.W.0050.000000T0000Z-120906T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ROANOKE VA-BOTETOURT VA-
803 PM EDT WED SEP 5 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT FOR
NORTHEASTERN ROANOKE AND SOUTHWESTERN BOTETOURT COUNTIES...
AT 758 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT THUNDERSTORMS HAD DIMINISHED WITHIN THE FLASH FLOOD WARNING
AREA...BUT SCATTERED THUNDERSTORMS CONTINUED FROM NORTHERN ROANOKE
COUNTY NEAR CATAWBA...TO NEAR THE ROANOKE AIRPORT...TO JUST SOUTH OF
FINCASTLE. RAINFALL RATES HAVE DIMINISHED TO GENERALLY LESS THAN 0.5
INCH PER HOUR WITHIN THE FLASH FLOOD WARNING AREA.
HOWEVER...RAINFALL OF 2.0 TO 2.5 INCHES LIKELY FELL IN WESTERN
BOTETOURT COUNTY JUST NORTH OF CLOVERDALE AND JUST NORTH OF THE
ROANOKE AIRPORT IN NORTHEASTERN ROANOKE COUNTY.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CATAWBA...
TROUTVILLE...NACE...LAYMANTOWN...DALEVILLE...CLOVERDALE AND BLUE
RIDGE
PRECAUTIONARY/PREPAREDNESS ACTIONS...
ADDITIONAL RAINFALL AMOUNTS OF 0.5 TO 1.0 INCH MAY OCCUR IN
SCATTERED SPOTS THROUGHOUT THE FLASH FLOOD WARNING AREA.
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.
FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.
DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.
&&
LAT...LON 3743 7975 3740 7981 3737 7978 3732 7985
3731 7988 3733 7997 3731 8001 3738 8017
3744 8002 3746 7983
$$846
WGUS71 KRNK 060055
FFSRNK
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
855 PM EDT WED SEP 5 2012
VAC023-161-060102-
/O.CAN.KRNK.FF.W.0050.000000T0000Z-120906T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ROANOKE VA-BOTETOURT VA-
855 PM EDT WED SEP 5 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
ROANOKE AND SOUTHWESTERN BOTETOURT COUNTIES...
ONLY A FEW LIGHT SHOWERS REMAIN ACROSS THE FLASH FLOOD WARNING AREA.
NO SIGNIFICANT RAINFALL HAS FALLEN SINCE 800 PM. SOME CREEKS AND
SMALL STREAMS LIKELY REMAIN AT OR NEAR BANKFULL IN NORTHEAST ROANOKE
AND WESTERN BOTETOURT COUNTIES FROM JUST NORTHEAST OF THE ROANOKE
AIRPORT TO JUST SOUTH OF FINCASTLE. IN ADDITION...THE THREAT OF
FLASH FLOODING ALONG INTERSTATE 81 BETWEEN MILE MARKERS 145 AND 55
HAS ENDED. HOWEVER...SOME AREAS OF STANDING WATER MAY REMAIN IN THIS
GENERAL AREA ALONG INTERSTATE 81 DURING THE NEXT COUPLE OF HOURS.
FLOODING HAS ENDED OVER THE WARNED AREA...THUS THE FLASH FLOOD
WARNING HAS BEEN CANCELLED. AN URBAN AND SMALL STREAM FLOOD ADVISORY
REMAINS IN EFFECT FOR AREAS ALONG INTERSTATE 81 FROM MILE MARKERS
145 TO 155 AND IMMEDIATE ADJACENT AREAS THROUGH 945 PM EDT.
LAT...LON 3743 7975 3740 7981 3737 7978 3732 7985
3731 7988 3733 7997 3731 8001 3738 8017
3744 8002 3746 7983
$$
RABThe office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 8:37 PM EDT | Areal Flood Advisory | RNK | Patrick | 3 hr |
| Sep 5, 11:21 AM EDT | Special Weather Statement | RNK | Smyth | 54 min |
| Sep 5, 12:48 PM EDT | Special Weather Statement | RNK | Alleghany, City of Covington | 27 min |
| Sep 5, 1:29 PM EDT | Special Weather Statement | RNK | Rockbridge, City of Lexington | 46 min |
| Sep 5, 1:59 PM EDT | Special Weather Statement | RNK | Bedford | 46 min |
| Sep 5, 2:23 PM EDT | Special Weather Statement | RNK | Rockbridge | 22 min |
| Sep 5, 4:30 PM EDT | Areal Flood Advisory | RNK | Alleghany | 3 hr |
| Sep 5, 6:37 PM EDT | Special Weather Statement | RNK | Botetourt | 53 min |
| Sep 5, 7:00 PM EDT | Areal Flood Advisory | RNK | Botetourt, Roanoke | 3 hr |
Nearby
Flash Flood Warnings in Virginia, 2012Every flash flood warning in 2012
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.