Alert archive / Virginia / Flash Flood Warnings in 1999
Flash Flood Warning 31, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood warning at Sep 9, 1999, 2:16 PM EDT for Floyd County, Virginia. 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 counties it named.
The facts
- Issued
- Sep 9, 1999, 2:16 PM EDT (18:16 UTC)
- Expired
- Sep 9, 1999, 6:20 PM EDT
- In force
- 4 hr
- Issued by
- NWS Blacksburg, VA
- Area
- Whole counties
County Floyd County, VA
The radar
The Roanoke radar (KFCX), 13 km from the middle of the area, began a volume at 18:20 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, 6.3 hours before the alert went out and 82 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
- 372 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 1296 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this flash flood warning 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 warning went out at Sep 9, 10:05 AM EDT, 4 hours 11 minutes earlier.
Area forecast discussion, Sep 9, 10:05 AM EDT, 4 hours 11 minutes before
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</html>In the hours before
Special weather statement, Sep 9, 11:20 AM EDT, 2 hours 56 minutes before
NCZ004>006-019-020-VAZ022>024-032>035-043>047-058-059-092100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE BLACKSBURG VA 1120 AM EDT THU SEP 9 1999 ...SLIGHT RISK OF SEVERE THUNDERSTORMS INTO EARLY THIS EVENING... SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE MOUNTAINS THIS AFTERNOON...AND THEN PASS EAST INTO THE PIEDMONT SECTIONS BY EARLY EVENING. SOME OF THE STORMS HAVE THE POTENTIAL TO STRENGTHEN TO SEVERE LEVELS...WITH A THREAT OF BOTH LARGE HAIL AND DAMAGING WINDS. A COLD FRONT WILL PASS THROUGH THE AREA OVERNIGHT...AND THE AIRMASS IN THE PIEDMONT WILL BECOME MODERATELY UNSTABLE BY LATE AFTERNOON. A LINE OF THUNDERSTORMS COULD ALSO DEVELOP...AND A FEW MAY PRODUCE WIND GUSTS OVER 60 MPH OR LARGE HAIL. IN ADDITION...THE STORMS WILL BE SLOW MOVING...AND OVER FAIRLY WET GROUND...SO MINOR FLOODING OF LOW LYING AND POOR DRAINAGE AREAS IS POSSIBLE. SKYWARN SPOTTER ACTIVATION MAY BE NECESSARY LATE THIS AFTERNOON. LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER UPDATES AND POSSIBLE WARNINGS.
Special weather statement, Sep 9, 11:20 AM EDT, 2 hours 56 minutes before
NCZ004>006-019-020-VAZ022>024-032>035-043>047-058-059-092100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE BLACKSBURG VA 1120 AM EDT THU SEP 9 1999 ...SLIGHT RISK OF SEVERE THUNDERSTORMS INTO EARLY THIS EVENING... SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE MOUNTAINS THIS AFTERNOON...AND THEN PASS EAST INTO THE PIEDMONT SECTIONS BY EARLY EVENING. SOME OF THE STORMS HAVE THE POTENTIAL TO STRENGTHEN TO SEVERE LEVELS...WITH A THREAT OF BOTH LARGE HAIL AND DAMAGING WINDS. A COLD FRONT WILL PASS THROUGH THE AREA OVERNIGHT...AND THE AIRMASS IN THE PIEDMONT WILL BECOME MODERATELY UNSTABLE BY LATE AFTERNOON. A LINE OF THUNDERSTORMS COULD ALSO DEVELOP...AND A FEW MAY PRODUCE WIND GUSTS OVER 60 MPH OR LARGE HAIL. IN ADDITION...THE STORMS WILL BE SLOW MOVING...AND OVER FAIRLY WET GROUND...SO MINOR FLOODING OF LOW LYING AND POOR DRAINAGE AREAS IS POSSIBLE. SKYWARN SPOTTER ACTIVATION MAY BE NECESSARY LATE THIS AFTERNOON. LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER UPDATES AND POSSIBLE WARNINGS.
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 1:56 PM EDT | Severe Thunderstorm Warning | RNK | Floyd | 49 min |
| Sep 9, 2:40 PM EDT | Severe Thunderstorm Warning | RNK | Roanoke | 65 min |
| Sep 9, 3:08 PM EDT | Flash Flood Warning | RNK | Patrick | 2 hr |
| Sep 9, 4:37 PM EDT | Severe Thunderstorm Warning | RNK | Rockbridge, City of Buena Vista, City of Lexington | 48 min |
| Sep 9, 5:30 PM EDT | Flash Flood Warning | RNK | Amherst | 2 hr |
Nearby
Flash Flood Warnings in Virginia, 1999Every flash flood warning in 1999
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.