Alert archive / North Carolina / Flash Flood Watches in 2012
Flash Flood Watch 13, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood watch at Aug 6, 2012, 4:17 AM EDT for Grayson County, Virginia; Ashe County, Watauga County, North Carolina. It took effect at Aug 6, 2012, 8:00 AM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 6, 2012, 4:17 AM EDT (08:17 UTC)
- In effect from
- Aug 6, 2012, 8:00 AM EDT
- Expired
- Aug 6, 2012, 3:26 PM EDT
- In force
- 7 hr
- Issued by
- NWS Blacksburg, VA
- Flood severity
- None
Counties Ashe County, NC, Watauga County, NC, Grayson County, VA
The radar
The Roanoke radar (KFCX), 125 km from the middle of the area, began a volume at 08:17 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, 8.3 hours before the alert went out and 147 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
- 286 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1128 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
335 WGUS61 KRNK 060817 FFARNK URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE BLACKSBURG VA 417 AM EDT MON AUG 6 2012 ...SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN EXPECTED AGAIN TODAY... .A COOL FRONT WILL DRIFT SOUTHEAST THROUGH THE MID APPALACHIAN AND MID ATLANTIC STATES TODAY INTO TONIGHT BEFORE STALLING AND DISSIPATING OVER NORTH CAROLINA ON TUESDAY. SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN ARE EXPECTED TO PRECEDE AND ACCOMPANY THE PASSAGE OF THIS FRONT. NCZ001-018-061630- /O.NEW.KRNK.FF.A.0013.120806T1200Z-120807T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ASHE-WATAUGA- INCLUDING THE CITIES OF...WEST JEFFERSON...BOONE 417 AM EDT MON AUG 6 2012 ...FLASH FLOOD WATCH IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THIS EVENING... THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A * FLASH FLOOD WATCH FOR A PORTION OF NORTHWEST NORTH CAROLINA... INCLUDING THE FOLLOWING AREAS...ASHE AND WATAUGA. * FROM 8 AM EDT THIS MORNING THROUGH THIS EVENING * A TROPICAL AIRMASS WILL COMBINE WITH AN APPROACHING COOL FRONT TO PRODUCE NUMEROUS TO WIDESPREAD SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS OF NORTH CAROLINA TODAY...IMPACTING THE SAME AREAS THAT RECEIVED SIGNIFICANT RAINFALL ON SUNDAY. RUNOFF FROM ADDITIONAL RAIN WILL BE SIGNIFICANT AND IMMEDIATE...INCREASING THE THREAT FOR FLASH FLOODING IN BOTH ASHE AND WATAUGA COUNTY. * POTENTIAL LOCALIZED ROAD WASHOUTS AND MUDSLIDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WERT
2 follow-up statements
612 WGUS61 KRNK 061456 FFARNK URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE BLACKSBURG VA 1056 AM EDT MON AUG 6 2012 ...SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN EXPECTED AGAIN TODAY... .A COOL FRONT WILL DRIFT SOUTHEAST THROUGH THE MID APPALACHIAN AND MID ATLANTIC STATES TODAY INTO TONIGHT BEFORE STALLING AND DISSIPATING OVER NORTH CAROLINA ON TUESDAY. SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN ARE EXPECTED TO PRECEDE AND ACCOMPANY THE PASSAGE OF THIS FRONT. VAZ015-062300- /O.EXB.KRNK.FF.A.0013.000000T0000Z-120807T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GRAYSON- INCLUDING THE CITIES OF...INDEPENDENCE...WHITETOP...TROUTDALE... VOLNEY 1056 AM EDT MON AUG 6 2012 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING... THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE A PORTION OF SOUTHWEST VIRGINIA... INCLUDING THE FOLLOWING AREA...GRAYSON. * THROUGH THIS EVENING * A TROPICAL AIRMASS WILL COMBINE WITH AN APPROACHING COOL FRONT TO PRODUCE NUMEROUS SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS OF NORTH CAROLINA TODAY...IMPACTING THE SAME AREAS THAT RECEIVED SIGNIFICANT RAINFALL ON SUNDAY. RUNOFF FROM ADDITIONAL RAIN WILL INCREASE THE THREAT FOR FLASH FLOODING ESPECIALLY IN URBANIZED OR HILLY TERRAIN. * POTENTIAL ROAD WASHOUTS AND MUDSLIDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ NCZ001-018-062300- /O.EXT.KRNK.FF.A.0013.000000T0000Z-120807T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ASHE-WATAUGA- INCLUDING THE CITIES OF...WEST JEFFERSON...BOONE 1056 AM EDT MON AUG 6 2012 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING... THE FLASH FLOOD WATCH IS NOW IN EFFECT FOR * A PORTION OF NORTHWEST NORTH CAROLINA...INCLUDING THE FOLLOWING AREAS...ASHE AND WATAUGA. * THROUGH THIS EVENING * A TROPICAL AIRMASS WILL COMBINE WITH AN APPROACHING COOL FRONT TO PRODUCE NUMEROUS SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS OF NORTH CAROLINA TODAY...IMPACTING THE SAME AREAS THAT RECEIVED SIGNIFICANT RAINFALL ON SUNDAY. RUNOFF FROM ADDITIONAL RAIN WILL INCREASE THE THREAT FOR FLASH FLOODING ESPECIALLY IN URBANIZED OR HILLY TERRAIN. * POTENTIAL ROAD WASHOUTS AND MUDSLIDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
125 WGUS61 KRNK 061926 FFARNK FLOOD WATCH NATIONAL WEATHER SERVICE BLACKSBURG VA 326 PM EDT MON AUG 6 2012 NCZ001-018-VAZ015-062030- /O.CAN.KRNK.FF.A.0013.000000T0000Z-120807T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ASHE-WATAUGA-GRAYSON- INCLUDING THE CITIES OF...WEST JEFFERSON...BOONE...INDEPENDENCE... WHITETOP...TROUTDALE...VOLNEY 326 PM EDT MON AUG 6 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHWEST NORTH CAROLINA AND SOUTHWEST VIRGINIA HAS BEEN CANCELLED. HOWEVER SHOWERS WILL REMAIN IN THE REGION INTO THE EVENING ALTHOUGH NONE ARE EXPECTED TO CAUSE WIDESPREAD FLOODING. $$
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 8:08 PM EDT | Special Weather Statement | RNK | Alleghany, Amherst, Bath, Rockbridge, City of Buena Vista, City of Covington and 1 more | 52 min |
| Aug 5, 9:00 PM EDT | Areal Flood Advisory | RNK | Botetourt, Craig, Floyd, Montgomery, Pulaski, Roanoke and 4 more | 107 min |
| Aug 5, 9:11 PM EDT | Special Weather Statement | RNK | Carroll, Grayson, City of Galax | 64 min |
| Aug 6, 2:47 PM EDT | Special Weather Statement | RNK | Halifax | 58 min |
| Aug 6, 3:03 PM EDT | Special Weather Statement | RNK | Appomattox | 57 min |
| Aug 6, 5:42 PM EDT | Special Weather Statement | RNK | Henry, City of Martinsville | 63 min |
| Aug 6, 6:16 PM EDT | Special Weather Statement | RNK | Charlotte | 59 min |
| Aug 6, 6:59 PM EDT | Special Weather Statement | RNK | Henry, City of Martinsville | 61 min |
| Aug 6, 7:14 PM EDT | Areal Flood Advisory | RNK | Henry, Pittsylvania, City of Martinsville | 109 min |
| Aug 6, 7:36 PM EDT | Special Weather Statement | RNK | Stokes | 54 min |
Nearby
Flash Flood Watches in North Carolina, 2012Flash Flood Watches in Virginia, 2012Every flash flood watch 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.