Alert archive / North Carolina / Flash Flood Warnings in 1999

Flash Flood Warning 17, NWS Blacksburg, VA

August 23, 1999Ashe County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Aug 23, 1999, 2:34 PM EDT for Ashe County, North Carolina. It was in force for 116 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 23, 1999, 2:34 PM EDT (18:34 UTC)
Expired
Aug 23, 1999, 4:30 PM EDT
In force
116 min
Issued by
NWS Blacksburg, VA
Area
Whole counties

County Ashe County, NC

The radar

The Roanoke radar (KFCX), 127 km from the middle of the area, began a volume at 18:37 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, 6.6 hours before the alert went out and 197 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-pSkew-T log-p diagram, Roanoke, VA at 12:00Z on 1999-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 12:00Z on 1999-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
11 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
1062 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 23, 10:15 AM EDT, 4 hours 19 minutes earlier.

Area forecast discussion, Aug 23, 10:15 AM EDT, 4 hours 19 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
1015 AM EDT MON AUG 23 1999

DEVELOPMENT OF CONVECTION ACROSS SRN PDMT OF NC THIS MORNING IS
CONFIRMING THE 09Z RUC...WHICH CONTS TO BRING QPF UP INTO OUR SW
COUNTIES DURING THE DAY. THIS MAKES SENSE LOOKING AT 850 PLOT...WITH
HIGHER DWPTS WRAPPING UP AND AROUND THE BACKSIDE OF A WEAK HIGH
SITUATED OVER THE CENTRAL CAROLINAS. THIS FLOW IS ALSO
CONVERGENT...SO WILL ADD SOME POPS FOR THIS AFTN ACROSS THE NW MTNS
AND NRN FOOTHILLS OF NC. WILL HOLD OFF EVERYWHERE ELSE.

.RNK
VA...NONE.
NC...NONE.
WV...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 2:07 PM EDTFlash Flood WarningRNKRoanoke118 min
Aug 23, 2:47 PM EDTFlash Flood WarningRNKFloyd2 hr
Aug 23, 3:15 PM EDTFlash Flood WarningRNKFranklin2 hr
Aug 23, 5:56 PM EDTFlash Flood WarningRNKFranklin64 min

Nearby

Flash Flood Warnings in North Carolina, 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.