Alert archive / Virginia / Flash Flood Watches in 2009
Flash Flood Watch 7, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood watch at Jul 20, 2009, 9:27 AM EDT for 35 counties in Virginia; 9 counties in North Carolina. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2009, 9:27 AM EDT (13:27 UTC)
- Expired
- Jul 20, 2009, 9:41 PM EDT
- In force
- 12 hr
- Issued by
- NWS Blacksburg, VA
- Flood severity
- None
All 44 counties
Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Covington, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Wythe County, VA
The radar
The Roanoke radar (KFCX), 19 km from the middle of the area, began a volume at 13:28 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, 1.5 hours before the alert went out and 107 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
- 632 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Blacksburg, VA wrote its last area forecast discussion before this flash flood watch went out at Jul 20, 7:53 AM EDT, 1 hour 34 minutes earlier.
Area forecast discussion, Jul 20, 7:53 AM EDT, 1 hour 34 minutes before
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</html>Hazardous weather outlook, Jul 20, 6:34 AM EDT, 2 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BLACKSBURG VA 634 AM EDT MON JUL 20 2009 NCZ001>004-018>020-VAZ013>017-022>024-032>035-043-211045- ASHE-ALLEGHANY NC-SURRY-STOKES-WATAUGA-WILKES-YADKIN-PULASKI- MONTGOMERY-GRAYSON-CARROLL-FLOYD-ROANOKE-BOTETOURT-ROCKBRIDGE- PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY- 634 AM EDT MON JUL 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH CENTRAL VIRGINIA...SOUTHWEST VIRGINIA AND WEST CENTRAL VIRGINIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. HOWEVER EXPECT A PROLONGED PERIOD OF SHOWERS AND THUNDERSTORMS. THE THREAT OF HEAVY RAIN AND POSSIBLY LOCALIZED FLOODING WILL INCREASE THROUGHOUT THE DAY AND INTO THE EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NCZ005-006-VAZ007-009>012-018>020-044>047-058-059-WVZ042>045-211045- ROCKINGHAM-CASWELL-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-CRAIG- ALLEGHANY VA-BATH-PITTSYLVANIA-CAMPBELL-APPOMATTOX-BUCKINGHAM- HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-GREENBRIER- 634 AM EDT MON JUL 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH CENTRAL VIRGINIA...SOUTHWEST VIRGINIA...WEST CENTRAL VIRGINIA AND SOUTHEAST WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, Jul 20, 6:00 AM EDT, 3 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
600 AM EDT MON JUL 20 2009
NCZ003-004-020-VAZ014-016>018-022-023-032>034-043-201100-
BEDFORD VA-BOTETOURT VA-CARROLL VA-CRAIG VA-FLOYD VA-FRANKLIN VA-
HENRY VA-MONTGOMERY VA-PATRICK VA-ROANOKE VA-STOKES NC-SURRY NC-
YADKIN NC-
600 AM EDT MON JUL 20 2009
...STRONG THUNDERSTORMS WILL AFFECT BEDFORD...BOTETOURT...CARROLL...
CITY OF BEDFORD...CITY OF ROANOKE...CITY OF SALEM...CRAIG...FLOYD...
FRANKLIN...HENRY...MONTGOMERY...PATRICK...ROANOKE...STOKES...SURRY
AND YADKIN COUNTIES...
AT 559 AM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 4 MILES
SOUTH OF TROUTVILLE TO YADKINVILLE...MOVING NORTHEAST AT 20 MPH.
VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
EXPECT FREQUENT CLOUD TO GROUND LIGHTNING FROM THESE STORMS.
THESE STORMS WILL BE NEAR NACE AROUND 615 AM...FINCASTLE AROUND 630
AM...SPRINGWOOD AROUND 645 AM AND STUART AROUND 700 AM.
STAY INSIDE AND AWAY FROM WINDOWS UNTIL THE STORMS PASS.
LAT...LON 3605 8088 3611 8088 3761 8016 3766 8002
3758 7957 3754 7951 3755 7940 3625 8024
3625 8045 3612 8044 3609 8050 3605 8050
EXPERIMENTAL
AMSSpecial weather statement, Jul 20, 7:30 AM EDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
730 AM EDT MON JUL 20 2009
VAZ022-023-201200-
BOTETOURT VA-ROANOKE VA-
730 AM EDT MON JUL 20 2009
...A STRONG THUNDERSTORM WILL AFFECT BOTETOURT...CITY OF ROANOKE...
CITY OF SALEM AND ROANOKE COUNTIES...
AT 729 AM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER ROANOKE...
MOVING NORTH AT 20 MPH.
THIS STORM WILL PRODUCE HAIL UP TO DIME SIZE. VERY HEAVY RAIN WILL
FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
THIS STORM WILL BE NEAR HOLLINS AROUND 735 AM...CLOVERDALE AROUND 740
AM...BLUE RIDGE AROUND 745 AM AND DALEVILLE AROUND 750 AM.
LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.
LAT...LON 3741 7979 3740 7981 3739 7980 3732 7982
3732 7984 3725 7985 3722 7986 3725 8008
3744 8002
EXPERIMENTAL
AMSLocal storm report, Jul 20, 7:35 AM EDT, 1 hour 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
735 AM EDT MON JUL 20 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0710 AM HAIL HOLLINS 37.34N 79.95W
07/20/2009 E1.00 INCH ROANOKE VA TRAINED SPOTTER
SPOTTER REPORTED PENNY TO QUARTER SIZE HAIL.
&&
MCLocal storm report, Jul 20, 7:52 AM EDT, 1 hour 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
752 AM EDT MON JUL 20 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0725 AM FLASH FLOOD 3 SW ROANOKE 37.25N 80.01W
07/20/2009 ROANOKE VA TRAINED SPOTTER
SPOTTER REPORTED CREEK OUT OF ITS BANK ON MUDLICK ROAD
COVERING ONE LANE OF TRAFFIC.
0715 AM FLASH FLOOD 3 ESE ROANOKE MOUNTAIN 37.20N 79.88W
07/20/2009 FRANKLIN VA AIRPLANE PILOT
SPOTTER REPORTED 2-3 INCHES OF WATER FLOWING OVER ROUTE
116 ON THE ROANOKE AND FRANKLIN COUNTY BORDER. ALSO
REPORTED MUD FLOWING OVER ROAD IN AREAS.
&&
MCSpecial weather statement, Jul 20, 8:24 AM EDT, 1 hour 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
824 AM EDT MON JUL 20 2009
VAZ023-034-201315-
BEDFORD VA-BOTETOURT VA-
824 AM EDT MON JUL 20 2009
...A STRONG THUNDERSTORM WILL AFFECT BEDFORD...BOTETOURT AND CITY OF
BEDFORD COUNTIES...
AT 821 AM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHEAST
OF MONETA...MOVING NORTH AT 15 MPH.
WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
VERY HEAVY RAIN WILL ALSO FALL FROM THIS STORM...AND WILL CAUSE
WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL
STREAMS.
THIS STORM WILL BE NEAR D-DAY MEMORIAL AROUND 850 AM...THAXTON AROUND
855 AM AND PEAKS OF OTTER SUMMIT AROUND 915 AM.
LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.
LAT...LON 3757 7956 3754 7951 3754 7949 3757 7945
3756 7938 3714 7946 3715 7967 3716 7969
3758 7972
EXPERIMENTAL
KKSpecial weather statement, Jul 20, 9:04 AM EDT, 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
904 AM EDT MON JUL 20 2009
NCZ003-004-020-201400-
STOKES NC-SURRY NC-YADKIN NC-
904 AM EDT MON JUL 20 2009
...A STRONG THUNDERSTORM WILL AFFECT STOKES...SURRY AND YADKIN
COUNTIES...
AT 903 AM EDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES NORTHEAST
OF BOONVILLE...MOVING NORTHEAST AT 10 MPH.
VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
THIS STORM WILL BE NEAR FAIRVIEW AROUND 910 AM...SILOAM AROUND 920
AM...DOBSON AROUND 925 AM...LEVEL CROSS AROUND 930 AM...ARARAT AROUND
955 AM AND WESTFIELD AROUND 1000 AM.
LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.
LAT...LON 3617 8064 3626 8083 3656 8064 3655 8048
3647 8033
EXPERIMENTAL
KKThe office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 4:47 AM EDT | Special Weather Statement | RNK | Floyd, Patrick | 58 min |
| Jul 20, 6:00 AM EDT | Special Weather Statement | RNK | Botetourt, Floyd, Franklin, Patrick, Roanoke, City of Roanoke and 1 more | 60 min |
| Jul 20, 6:47 AM EDT | Flash Flood Warning | RNK | Floyd, Franklin, Patrick | 5 hr |
| Jul 20, 7:30 AM EDT | Special Weather Statement | RNK | City of Roanoke, City of Salem | 30 min |
| Jul 20, 7:36 AM EDT | Flash Flood Warning | RNK | Botetourt, Franklin, Roanoke, City of Roanoke, City of Salem | 4 hr |
| Jul 20, 8:24 AM EDT | Special Weather Statement | RNK | Bedford | 51 min |
| Jul 20, 9:38 AM EDT | Special Weather Statement | RNK | Rockbridge, City of Buena Vista, City of Lexington | 67 min |
| Jul 20, 10:45 AM EDT | Flash Flood Warning | RNK | Carroll, Patrick | 6 hr |
| Jul 20, 10:58 AM EDT | Special Weather Statement | RNK | Appomattox, Campbell, City of Lynchburg | 62 min |
| Jul 20, 11:27 AM EDT | Severe Thunderstorm Warning | RNK | Amherst, Appomattox, Campbell | 63 min |
| Jul 20, 12:23 PM EDT | Severe Thunderstorm Warning | RNK | Appomattox, Buckingham | 52 min |
| Jul 20, 1:15 PM EDT | Areal Flood Advisory | RNK | Appomattox, Campbell, Charlotte | 6 hr |
| Jul 20, 2:04 PM EDT | Special Weather Statement | RNK | Smyth | 41 min |
| Jul 20, 9:04 AM EDT | Special Weather Statement | RNK | Surry | 56 min |
| Jul 20, 3:57 PM EDT | Special Weather Statement | RNK | Ashe | 33 min |
| Jul 20, 6:29 PM EDT | Flash Flood Warning | RNK | Watauga | 2 hr |
Nearby
Flash Flood Watches in Virginia, 2009Flash Flood Watches in North Carolina, 2009Every flash flood watch in 2009
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.