Alert archive / North Carolina / Flash Flood Warnings in 2003

Flash Flood Warning 71, NWS Raleigh, NC

August 9, 2003Orange County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 9, 2003, 8:16 PM EDT for Orange County, North Carolina. It was in force for 119 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 9, 2003, 8:16 PM EDT (00:16 UTC)
Expired
Aug 9, 2003, 10:15 PM EDT
In force
119 min
Issued by
NWS Raleigh, NC
Area
Whole counties

County Orange County, NC

The radar

The Raleigh/Durham radar (KRAX), 72 km from the middle of the area, began a volume at 00:20 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.3 hours before the alert went out and 70 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 2003-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1581 joules per kilogram.LCLEL10008507005003002001001 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 2003-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
1581 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
934 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KRAH 100019
FFWRAH
NCC135-100215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
816 PM EDT SAT AUG 9 2003

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ORANGE COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 1015 PM EDT

* AT 816 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED     
  THUNDERSTORMS WITH VERY HEAVY RAIN REDEVELOPING OVER ORANGE COUNTY 
  FROM HILLSBOROUGH AND CHAPEL HILL WEST TO EFLAND. 

* THUNDERSTORMS ARE CONTINUOUSLY REDEVELOPING AND WILL PRODUCE
  FLASH FLOODING AROUND...  
  HILLSBOROUGH.
  EFLAND.
  CHAPEL HILL.
  
RADAR INDICATED THAT 2 TO 3 INCHES OF RAIN HAD ALREADY FALLEN
NEAR HILLSBOROUGH. ADDITIONAL THUNDERSTORMS WILL CREATE FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE EXPERIENCING FLOODING OR LIVE IN A FLOOD PRONE AREA MOVE
TO HIGHER GROUND IMMEDIATELY.

$$

PWB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 9:42 PM EDTFlash Flood WarningRAHDurham93 min
Aug 9, 9:56 PM EDTFlash Flood WarningRAHDavidson94 min
Aug 10, 12:17 AM EDTFlash Flood WarningRAHRandolph118 min
Aug 10, 12:35 AM EDTFlash Flood WarningRAHMontgomery100 min
Aug 10, 2:15 AM EDTFlash Flood WarningRAHMontgomery, Randolph3 hr
Aug 10, 11:50 AM EDTFlash Flood WarningRAHWake115 min
Aug 10, 5:33 PM EDTFlash Flood WarningRAHMoore87 min
Aug 10, 5:43 PM EDTFlash Flood WarningRAHHarnett2 hr

Nearby

Flash Flood Warnings in North Carolina, 2003Every flash flood warning in 2003

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.