Alert archive / North Carolina / Flash Flood Warnings in 2012
Flash Flood Warning 38, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood warning at Jul 21, 2012, 5:37 PM EDT for Caswell County, North Carolina. It was in force for 4 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
- Jul 21, 2012, 5:37 PM EDT (21:37 UTC)
- Expired
- Jul 21, 2012, 9:58 PM EDT
- In force
- 4 hr
- Issued by
- NWS Blacksburg, VA
- Area
- Storm-based polygon
- Flood severity
- None
County Caswell County, NC
The radar
The Roanoke radar (KFCX), 111 km from the middle of the area, began a volume at 21:38 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 12:00Z, 9.6 hours before the alert went out and 73 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
- 679 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 870 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
160
WGUS51 KRNK 212137
FFWRNK
NCC033-220330-
/O.NEW.KRNK.FF.W.0038.120721T2137Z-120722T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
537 PM EDT SAT JUL 21 2012
THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN CASWELL COUNTY IN NORTH CENTRAL NORTH CAROLINA
* UNTIL 1130 PM EDT.
* AT 529 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA. THIS
RAIN WILL FALL ACROSS AREAS WHICH RECEIVED 3 TO 5 INCHES OF RAIN
EARLIER THIS AFTERNOON. MANY CREEKS AND DITCHES ACROSS THE WARNED
AREA MAY BE AT BANKFULL...AND THIS NEXT ROUND OF RAIN WILL LIKELY
CAUSE THESE WATER WAYS TO FLOOD.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SEMORA...
PROVIDENCE...GATEWOOD...BLANCH AND MILTON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA.
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.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
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 3644 7942 3654 7942 3654 7913 3645 7913
3645 7914 3644 7914 3643 7915
$$
162 follow-up statements
435
WGUS71 KRNK 220036
FFSRNK
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
836 PM EDT SAT JUL 21 2012
NCC033-220330-
/O.CON.KRNK.FF.W.0038.000000T0000Z-120722T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CASWELL NC-
836 PM EDT SAT JUL 21 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT FOR
NORTHEASTERN CASWELL COUNTY...
AT 829 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT HEAVY RAIN HAS LEFT THE AREA. HOWEVER...RAINFALL AMOUNTS OF 6
TO 8 INCHES FELL ACROSS PARTS OF NORTHERN CASWELL COUNTY...WHICH
WILL RESULT IN OVERFLOWING CREEKS AND ROADSIDE DITCHES AND POSSIBLY
SPILL ONTO ROADWAYS.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SEMORA...
PROVIDENCE...GATEWOOD...BLANCH AND MILTON
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT ALLOW CHILDREN TO PLAY NEAR CREEKS AND DRAINAGE DITCHES WHEN
FULL. THE RAPID FLOW OF WATER MAY BE POWERFUL ENOUGH TO CARRY THEM
AWAY SHOULD THEY FALL IN.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
PLEASE RELAY ANY REPORTS OF FLOODING OR ROAD CLOSURES TO THE
NATIONAL WEATHER SERVICE IN BLACKSBURG BY CALLING TOLL FREE...1...8
6 6...2 1 5...4 3 2 4. DELAYED REPORTS ARE WELCOME.
&&
LAT...LON 3644 7942 3654 7942 3654 7913 3645 7913
3645 7914 3644 7914 3643 7915
$$
16720
WGUS71 KRNK 220158
FFSRNK
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
958 PM EDT SAT JUL 21 2012
NCC033-220207-
/O.CAN.KRNK.FF.W.0038.000000T0000Z-120722T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CASWELL NC-
958 PM EDT SAT JUL 21 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
CASWELL COUNTY...
FLOODING HAS ENDED OVER THE WARNED AREA...THUS THE FLASH FLOOD
WARNING HAS BEEN CANCELLED.
LAT...LON 3644 7942 3654 7942 3654 7913 3645 7913
3645 7914 3644 7914 3643 7915
$$
16The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 1:47 PM EDT | Special Weather Statement | RNK | Person | 43 min |
| Jul 21, 2:06 PM EDT | Areal Flood Advisory | RNK | Caswell | 3 hr |
| Jul 21, 3:33 PM EDT | Special Weather Statement | RNK | Caswell | 57 min |
| Jul 21, 4:40 PM EDT | Special Weather Statement | RNK | Rockingham | 65 min |
| Jul 21, 5:04 PM EDT | Severe Thunderstorm Warning | RNK | Caswell, Rockingham | 56 min |
| Jul 21, 5:15 PM EDT | Severe Thunderstorm Warning | RNK | Caswell | 60 min |
| Jul 21, 5:40 PM EDT | Severe Thunderstorm Warning | RNK | Caswell, Rockingham | 65 min |
Nearby
Flash Flood Warnings in North Carolina, 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.