Alert archive / North Carolina / Flash Flood Warnings in 2011
Flash Flood Warning 66, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood warning at Aug 18, 2011, 5:17 PM EDT for Alleghany County, North Carolina. It was in force for 5 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
- Aug 18, 2011, 5:17 PM EDT (21:17 UTC)
- Expired
- Aug 18, 2011, 10:20 PM EDT
- In force
- 5 hr
- Issued by
- NWS Blacksburg, VA
- Area
- Storm-based polygon
- Flood severity
- None
County Alleghany County, NC
The radar
The Roanoke radar (KFCX), 97 km from the middle of the area, began a volume at 21:18 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 |
|---|---|---|---|
| Aug 18, 5:30 PM EDT | FLASH FLOOD | 1 Ene Sparta, NC | 18TH STREET WAS CLOSED DUE TO HIGH WATER. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.3 hours before the alert went out and 123 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
- 257 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 1327 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- -9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
584 WGUS51 KRNK 182117 FFWRNK NCC005-190315- /O.NEW.KRNK.FF.W.0066.110818T2117Z-110819T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BLACKSBURG VA 517 PM EDT THU AUG 18 2011 THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A * FLASH FLOOD WARNING FOR... ALLEGHANY COUNTY IN NORTHWEST NORTH CAROLINA * UNTIL 1115 PM EDT. * AT 513 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 TWIN OAKS AND STRATFORD. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. 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 3657 8121 3651 8103 3643 8109 3651 8125 $$ RCS
2 follow-up statements
616 WGUS71 KRNK 182250 FFSRNK FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BLACKSBURG VA 650 PM EDT THU AUG 18 2011 NCC005-190315- /O.CON.KRNK.FF.W.0066.000000T0000Z-110819T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ALLEGHANY NC- 650 PM EDT THU AUG 18 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR ALLEGHANY COUNTY... AT 638 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED 18TH STREET WAS CLOSED DUE TO HIGH WATER FROM HEAVY RAIN THIS AFTERNOON. AS OF 630 PM...18TH STREET WAS REOPENED. DOPPLER RADAR ESTIMATED 4 TO 6 INCHES OF RAIN FELL NEAR SPARTA BETWEEN 400 PM AND 600 PM. RUNOFF WILL KEEP THE THREAT OF FLASH FLOODING IN THE WARNED AREA INTO THIS EVENING. PLEASE RELAY ANY REPORTS OF FLOODING INCLUDING MUDSLIDES...OR ROAD CLOSURES TO THE NATIONAL WEATHER SERVICE IN BLACKSBURG BY CALLING TOLL FREE...1...8 6 6...2 1 5...4 3 2 4. DELAYED REPORTS ARE WELCOME. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TWIN OAKS AND STRATFORD PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. && LAT...LON 3657 8121 3651 8103 3643 8109 3651 8125 $$ RCS
794 WGUS71 KRNK 190220 FFSRNK FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BLACKSBURG VA 1020 PM EDT THU AUG 18 2011 NCC005-190230- /O.CAN.KRNK.FF.W.0066.000000T0000Z-110819T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ALLEGHANY NC- 1020 PM EDT THU AUG 18 2011 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR ALLEGHANY COUNTY... EARLIER FLOODING HAS ENDED OVER THE WARNED AREA...THUS THE FLASH FLOOD WARNING HAS BEEN CANCELLED. LAT...LON 3657 8121 3651 8103 3643 8109 3651 8125 $$ JH
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:43 PM EDT | Special Weather Statement | RNK | Surry | 62 min |
| Aug 18, 2:45 PM EDT | Special Weather Statement | RNK | Surry | 30 min |
| Aug 18, 2:48 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Surry | 19 min |
| Aug 18, 3:38 PM EDT | Special Weather Statement | RNK | Alleghany | 67 min |
| Aug 18, 3:39 PM EDT | Special Weather Statement | RNK | Wilkes | 66 min |
| Aug 18, 4:10 PM EDT | Severe Thunderstorm Warning | RNK | Wilkes | 45 min |
| Aug 18, 4:30 PM EDT | Severe Thunderstorm Warning | RNK | Wilkes | 39 min |
| Aug 18, 5:00 PM EDT | Severe Thunderstorm Warning | RNK | Wilkes, Yadkin | 23 min |
| Aug 18, 7:03 PM EDT | Special Weather Statement | RNK | Ashe | 57 min |
Nearby
Flash Flood Warnings in North Carolina, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.