Alert archive / North Carolina / Flash Flood Warnings in 1999

Flash Flood Warning 49, NWS Blacksburg, VA

November 26, 1999Watauga County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Nov 26, 1999, 9:12 AM EST for Watauga County, North Carolina. 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: Nov 26, 1999, 9:12 AM EST (14:12 UTC)
Expired: Nov 26, 1999, 1:00 PM EST
In force: 4 hr
Issued by: NWS Blacksburg, VA
Area: Whole counties

County Watauga County, NC

The radar

The Knoxville radar (KMRX), 153 km from the middle of the area, began a volume at 14:14 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, 2.2 hours before the alert went out and 162 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: 9 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 578 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KROA 261410
FFWRNK
NCC189-261800-

BULLETIN--IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING FOR SMALL CREEKS AND STREAMS
NATIONAL WEATHER SERVICE BLACKSBURG VA
912 AM EST FRI NOV 26 1999

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLOOD WARNING FOR SMALL CREEKS AND STREAMS FOR...
  WATAUGA COUNTY IN NORTHWESTERN NORTH CAROLINA.

* UNTIL 1 PM EST.

* AT 912 AM...DOPPLER RADAR SHOWED HEAVY RAIN MOVING NORTHEAST FROM
EASTERN TENNESSEE AND SOUTHWESTERN NORTH CAROLINA...THIS RAIN
WILL AFFECT WATAUGA COUNTY DURING THE LATE MORNING AND MIDDAY HOURS.

* COUNTY OFFICIALS REPORT THAT THE FLOODING OF EARLIER IN THE
  MORNING HAS SUBSIDED BUT...THIS NEW AREA OF RAIN IS EXPECTED TO
  CAUSE SMALL STREAMS AND CREEKS TO REACH...AND EXCEED BANKFUL
  ONCE  AGAIN. IN ADDITION...PONDING OF WATER ON ROADS AND POOR
  DRAINAGE AREAS IS LIKELY TO OCCUR.


<< CALL TO ACTION >> DON'T DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD!

.END/NOGUEIRA

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 Nov 26, 2:45 AM EST, 6 hours 27 minutes earlier.

Area forecast discussion, Nov 26, 2:45 AM EST, 6 hours 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
245 AM EST THU NOV 25 1999

QUESTION TDY IS POTENTIAL FOR TSRA AND FLOODING. COLD AIR ALOFT
MOVES INTO WRN CWA BY 00Z SAT. ETA SHOWING A COUPLED JET STRUCTURE
SO ENHANCED UVV EXPECTED TO MOV ACRS CWA BETWEEN 18Z FRI AND 00Z
SAT. AT THE SAME TIME THE FNT WL BE COMING THRU PROVIDING LOW LVL
CONVERGENCE. PLUS OTHER FACTORS THAT WERE MENTIONED IN THE SPC DISC
HAS CONVINCED ME TO INCLUDE TSRA TDY.

AXIS OF HEAVY RAIN SHIFTS SLOWLY TO THE EAST TDY. WV LOOP SHOWS A
DECENT MOISTURE PLUME COMING OUT OF GULF INTO THE LOW. BETWEEN THE
DEEP MOISTURE...GOOD DYNAMICS AND EXPECTED CONVECTION SHUD GET A
WIDESPREAD 1.5 TO 3 INCHES OF RAIN TDY IN THE WRN CWA...MAINLY FM
12Z-00Z. THIS AREA GOT ANYWHERE FM 1.00 TO 3.00 INCHES THUR SO
PLAN ON A FLOOD WATCH FOR TDY.

SFC WINDS SHOW PRE FRONTAL WIND SHIFT FM SE TO SW THEN WINDS COME
ARND TO THE NW BY SAT EVE. RAIN SHUD END BY MID TNGT AS DEEPER
MOISTURE MOVES E. LOW LVL CLDS SHUD CLR OUT BY 12Z SAT. EVEN WITH
LOW CLDS AND RAIN THUR...TEMPS IN THE W MANAGED ABOUT A 6 DEGREE
RISE SO EXPECT A SIMILAR RISE TDY IN THE ALLEGHANY HIGHLANDS AND
NRV. IN THE PIEDMONT...TEMPS ALREADY NEAR FWC FCST HIGHS. SINCE THIS
GROUPING WL BE IN THE WARM SECTOR A LITTLE LONGER BEFORE THE RAIN
ARRIVES WL GO WITH ARND A 10 DEGREE RISE. WL GO A LITTLE COOLER
THAN GUID FOR LOWS SAT NGT BASED ON TEMPS IN UPSTREAM AIRMASS.
OTHERWISE WL TAKE BLEND OF GUID.

.RNK
VA...FLOOD WATCH TDY VAZ007-009>013-015-016.
WV...NONE.
NC...FLOOD WATCH TDY NCZ001-002-018.

AMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 26, 2:20 AM EST	Flash Flood Warning	RNK	Watauga	6 hr

Nearby

Flash Flood Warnings in North Carolina, 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.