Alert archive / North Carolina / Flash Flood Warnings in 1999

Flash Flood Warning 5, NWS Raleigh, NC

August 26, 1999Franklin County, Wake County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 26, 1999, 7:03 AM EDT for Franklin County, Wake County, North Carolina. 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
Aug 26, 1999, 7:03 AM EDT (11:03 UTC)
Expired
Aug 26, 1999, 10:00 AM EDT
In force
3 hr
Issued by
NWS Raleigh, NC
Area
Whole counties

Counties Franklin County, NC, Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 30 km from the middle of the area, began a volume at 11:07 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 00:00Z, 11.1 hours before the alert went out and 130 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, Greensboro/Hi Pt, NC at 00:00Z on 1999-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1009 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, Greensboro/Hi Pt, NC at 00:00Z on 1999-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.19395878Sfc1 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
1009 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
990 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRDU 261106 COR
FFWRDU
NCC069-183-261400-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING....CORRECTED...
NATIONAL WEATHER SERVICE RALEIGH NC
703 AM EDT THU AUG 26 1999

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FRANKLIN COUNTY IN NORTH CAROLINA
  NORTHERN WAKE COUNTY IN NORTH CAROLINA

* UNTIL 1000 AM EDT

* AT 650 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAIN FROM LOUISBURG SOUTHWEST ACROSS
  WAKE FOREST TO RALEIGH... MOVING NORTHEAST AROUND 30 MPH.

* A SECOND ROUND OF HEAVY RAIN PRODUCING THUNDERSTORMS IS MOVING
  ACROSS NORTHERN WAKE AND FRANKLIN COUNTIES. RADAR ESTIMATES THAT
  UP TO 6 INCHES OF RAIN HAVE FALLEN IN SOME AREAS OF SOUTHERN
  FRANKLIN COUNTY. THIS SECOND ROUND OF STORMS WILL CAUSE SMALLER
  STREAMS TO FLOOD.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

...CORRECTED FOR FLASH FLOOD WARNING IN EFFECT FOR ALL
OF FRANKL0IN COUNTY....

MLM/RA

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 Raleigh, NC wrote its last area forecast discussion before this flash flood warning went out at Aug 26, 1:47 AM EDT, 5 hours 16 minutes earlier.

Area forecast discussion, Aug 26, 1:47 AM EDT, 5 hours 16 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
147 AM EDT THU AUG 26 1999

SHORT TERM....
CONVECTION CONTINUING ACROSS NORTHERN TIER COUNTIES OF CWA. THIS
ACTIVITY FIRING ALONG VORT SPOKE AHEAD OF MAIN SYSTEM.
EXPECT THIS TO DIMINISH/END BEFORE PRESS TIME.

MODELS IN GENERAL AGREEMENT IN SLOWLY MOVING CLOSED UPPER LOW
NORTHEAST DURING THIS PERIOD WITH LOW BECOMING OPEN WAVE 36-48
HOURS. AS UPPER LOW ROTATES AND MOVE NORTHEAST...DRY AIR FILTERING
IN MID/UPPER LEVELS OVER THE AREA...ABOVE 700 MB. BUT LOW LEVELS
REMAIN QUITE MOIST AND FAIRLY UNSTABLE. DECENT AMOUNT OF PVA/OMEGA
MOVING IN THIS AFTERNOON ALONG WITH FRONTAL BOUNDARY APPROACHING
CWA AND AFTERNOON HEATING. ALL THIS COMBINED WILL WARRANT A CHANCE
FOR TSTM ACTIVITY TODAY. MAY NUDGE POPS UP A TAD EVENTHOUGH BOTH
MOS GUIDANCE HAVE LOWER POPS IN THE WEST.

TONIGHT/FRIDAY....
CONTINUED CHANCE FOR SCATTERED CONVECTION. ANOTHER SPOKE OF VORT
WILL MOVE ACROSS TONIGHT. THUS CURRENT 30 PERCENTS LOOKS GOOD.
LESSER CHANCE FOR FRIDAY AS UPPER SYSTEM PULLS AWAY BUT MINOR RIPPLE
TO MOVE THROUGH. ALSO FRONTAL BOUNDARY IN AREA AND AFTERNOON HEATING
WILL BE ENOUGH TO KEEP IN A SMALL CHANCE.

TEMPERATURES....LOW TO MID 80S TODAY. WARMER FRIDAY AS BETWEEN SYSTEMS
AND LESSER CHANCE FOR TSTMS.

EXTENDED...STILL SOME UNCERTAINITY AS DEPENDANT UPON WHETHER/HOW CLOSE
DENNIS WILL APPROACH MID ATLC COAST. THIS WILL DEPEND ON UPPER TROUGH
AS WHETHER IT WILL BE STRONG ENOUGH TO KEEP AWAY OR WEAKEN AND DENNIS
MOVE CLOSER TO SOUTHEAST MID ATLC COAST. AGAIN NGM TOO FAST AND TENDS
TO WASH SYSTEM OUT BY END OF PERIOD...AVN/ETA MORE REALISTIC AS STORM
MOVING VERY SLOW. FOR NOW WILL KEEP A CHANCE OF SCATTERED CONVECTION
IN THROUGH THE PERIOD.

ENJOY THE DAY.

.RAH...NONE.

RA

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 25, 10:20 PM EDTSevere Thunderstorm WarningRAHVance35 min
Aug 26, 7:36 AM EDTFlash Flood WarningRAHHalifax, Nash3 hr
Aug 26, 2:58 PM EDTSevere Thunderstorm WarningRAHWilson32 min
Aug 26, 4:19 PM EDTSevere Thunderstorm WarningRAHHarnett36 min
Aug 26, 4:44 PM EDTSevere Thunderstorm WarningRAHHarnett21 min
Aug 26, 4:58 PM EDTSevere Thunderstorm WarningRAHMoore32 min
Aug 26, 5:22 PM EDTSevere Thunderstorm WarningRAHFranklin33 min
Aug 26, 5:25 PM EDTSevere Thunderstorm WarningRAHMoore35 min
Aug 26, 5:34 PM EDTSevere Thunderstorm WarningRAHWarren31 min
Aug 26, 6:10 PM EDTSevere Thunderstorm WarningRAHHarnett35 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.