Alert archive / Virginia / Flash Flood Warnings in 1999

Flash Flood Warning 42, NWS Blacksburg, VA

September 29, 1999Amherst County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Sep 29, 1999, 9:20 PM EDT for Amherst County, Virginia. It was in force for 3 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 29, 1999, 9:20 PM EDT (01:20 UTC)
Expired: Sep 30, 1999, 12:15 AM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Whole counties

County Amherst County, VA

The radar

The Roanoke radar (KFCX), 119 km from the middle of the area, began a volume at 01:24 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 00:00Z, 1.3 hours before the alert went out and 55 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 191 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.2

Open this sounding in Storm Lab

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 29, 2:10 PM EDT, 7 hours 10 minutes earlier.

Area forecast discussion, Sep 29, 2:10 PM EDT, 7 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
210 PM EDT WED SEP 29 1999

17Z SFC ANALYSIS SHOWS CD FNT EXTENDING FROM LOW OVER LAKE ERIE
SOUTH THROUGH LEX TO CUMBERLAND PLATEAU IN TN. KRNK 88D SHOWS BATCH
OF RAIN GETTING READY TO EXIT ERN CWA WITH SCT TO BKN SHRA/TSRA
ELSEWHERE. RADAR COMPOSITE OF ERN U.S. SHOWS LINE OF TSRA ALG AND
AHEAD OF FNT IN CNTL AND ERN KY WITH LESS COVERAGE FURTHER SOUTH IN
TN. MAIN S/W ON WV CURRENTLY OVER WRN IL AND FURTHER NORTH THAN
MODELS DEPICTING. THIS WILL HAVE AN EFFECT ON PCPN COVERAGE THIS
EVENING AND EARLY TONIGHT. BELIEVE BST POOL OF MOISTURE CONVERGENCE
WILL BE IN NRN HALF OF CWA AND UPPER DIVERGENCE.

THIS DEFINES EVENING CONCERN FOR FFA...WHICH ATTM DOES NOT APPEAR TO
BE THE WAY TO GO. WILL LET SHORT TERM FORECASTS COVER POTENTIAL FOR
LOCALIZED SMALL STREAM FLOODING CONCERNS IF ANY. FNT SHOULD PICK UP
SPEED AS LOW SHOOTS OFF TO THE NORTHEAST INTO NY TONIGHT.

NEXT CONCERN IS HIGH WINDS FOR LATE TONIGHT AFTER FNT MOVES THROUGH.
LOW LEVEL FLOW TURNS NW ONCE FNT MOVES ACRS AND MODELS ARE PROGGING
30 TO 40 KNOT WINDS AT 850 FOR MUCH OF THE AREA WITH UP TO 30 KNOTS
DOWN AT 925 MB AND BL. FEEL THAT A HIGH WIND ADVISORY WOULD BE THE
WAY GO FOR AREAS ALONG AND WEST OF THE BLUE RIDGE MTNS INCLUDING THE
NEW RIVER VALLEY. THE HIGH WINDS WILL BE DURING A SMALL WINDOW OF
TIME FROM AFTER 06Z TO JUST B4 NOON THURSDAY.

PLAN ON GOING CATEGORICAL FOR ERN HALF OF CWA IN VA...AND ACRS SE WV
WITH LIKELY FURTHER SOUTH. WILL INVESTIGATE RADAR B4 ISSUING ZONES
AND MAY MAKE CHANGES AT LAST MINUTE DEPENDING ON COVERAGE.

BEST CAA IS LATE TONIGHT WITH NEUTRAL ADVECTION THU AFTN. THINK NGM
MOS MAY BE TOO HIGH ON TEMPS FOR THURSDAY AND AM LEANING TOWARD FAN
NUMBERS. HIGH PRESSURE TO KEEP US DRY THROUGH FRIDAY AND INTO THE
WEEKEND BEFORE TROPICAL MOISTURE WORKS NORTH AGAIN TOWARD SRN
APPLACHIANS LATE MONDAY GIVING US A CHANCE OF RAIN AS DEPICTED BY
MRF AND NOGAPS.

CALL WITH ANY COMMENTS/SUGGESTIONS. THANKS FOR THE
COORD...LWX...AKQ...RLX...GSP.

.RNK
VA...HIGH WIND ADVISORY FOR AREAS ALONG AND WEST OF BLUE RIDGE LATE
TONIGHT AND THURSDAY MORNING.
WV...HIGH WIND ADVISORY FOR SE WV LATE TONIGHT AND THURSDAY MORNING.
NC...HIGH WIND ADVISORY FOR NRN MTNS LATE TONIGHT AND THURSDAY
MORNING.

WHP

In the hours before

Local storm report, Sep 29, 7:50 PM EDT, 1 hour 30 minutes before

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Local storm report, Sep 29, 8:08 PM EDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VIRGINIA
808 PM EDT WED SEP 29 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0730 PM    LYNCHBURG                 VA   FLOODING
09/29/99   CAMPBELL                       SEVERAL ROADS CLOSED DUE
                                          TO HIGH
                                          WATER...HOLLINSVILLE
                                          RD...GRAVESMILL RD...
                                          FOREST BROOK RD...OLD
                                          GRAVES MILL RD...MAYFLOWER
                                          DRIVE.

Local storm report, Sep 29, 8:50 PM EDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VIRGINIA
850 PM EDT WED SEP 29 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0630 PM    MT AIRY                   NC   TORNADO
09/29/99   SURRY                          25-30 HOMES DAMAGED. 1
                                          DESTROYED MOBILE HOME, 1
                                          DAMAGED MOBILE HOME, 1
                                          WOOD STRUCTURE HOME VERY
                                          DAMAGED...ATTACHED CARPORT
                                          DESTROYED AND FELL ON 4
                                          CARS. STRIPPED EXTERNAL
                                          PANEL OFF OF HOUSE. DEBRIS
                                          FROM 3 HOMES FOUND 2
                                          MILES AWAY FROM SOURCE.
                                          TWISTED POWER POLES.

PMC

Local storm report, Sep 29, 8:50 PM EDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VIRGINIA
850 PM EDT WED SEP 29 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0630 PM    MT AIRY                   NC   TORNADO
09/29/99   SURRY                          25-30 HOMES DAMAGED. 1
                                          DESTROYED MOBILE HOME, 1
                                          DAMAGED MOBILE HOME, 1
                                          WOOD STRUCTURE HOME VERY
                                          DAMAGED...ATTACHED CARPORT
                                          DESTROYED AND FELL ON 4
                                          CARS. STRIPPED EXTERNAL
                                          PANEL OFF OF HOUSE. DEBRIS
                                          FROM 3 HOMES FOUND 2
                                          MILES AWAY FROM SOURCE.
                                          TWISTED POWER POLES.

PMC

Local storm report, Sep 29, 9:10 PM EDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VIRGINIA
910 PM EDT WED SEP 29 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0630 PM    WHITE SULPHUR SPGS        WV   WIND DAMAGE
09/29/99   GREENBRIER                     POWER LINES AND TREES
                                          DOWN. TREES UPROOTED. A
                                          LOT OF DEBRIS.

PMC

Local storm report, Sep 29, 9:10 PM EDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VIRGINIA
910 PM EDT WED SEP 29 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0630 PM    WHITE SULPHUR SPGS        WV   WIND DAMAGE
09/29/99   GREENBRIER                     POWER LINES AND TREES
                                          DOWN. TREES UPROOTED. A
                                          LOT OF DEBRIS.

PMC

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 29, 10:30 PM EDT	Flash Flood Warning	RNK	Amherst	6 hr
Sep 29, 11:42 PM EDT	Flash Flood Warning	RNK	Pittsylvania	4 hr
Sep 30, 12:20 AM EDT	Flash Flood Warning	RNK	Appomattox	4 hr
Sep 30, 12:42 AM EDT	Flash Flood Warning	RNK	Buckingham	5 hr

Nearby

Flash Flood Warnings in Virginia, 1999 Every 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.