Alert archive / North Carolina / Flash Flood Warnings in 2002

Flash Flood Warning 40, NWS Raleigh, NC

September 18, 2002Chatham County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 18, 2002, 12:29 PM EDT for Chatham County, North Carolina. It was in force for 61 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
Sep 18, 2002, 12:29 PM EDT (16:29 UTC)
Expired
Sep 18, 2002, 1:30 PM EDT
In force
61 min
Issued by
NWS Raleigh, NC
Area
Whole counties

County Chatham County, NC

The radar

The Raleigh/Durham radar (KRAX), 69 km from the middle of the area, began a volume at 16:31 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, 4.5 hours before the alert went out and 72 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 12:00Z on 2002-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1538 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 12:00Z on 2002-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
1538 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
537 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
69 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 
WGUS52 KRAH 181629
FFWRAH
NCC037-181730-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
1227 PM EDT WED SEP 18 2002

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 130 PM EDT

* AT 1227 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE WARNED AREA. DOPPLER 
RADAR INDICATED 1.25 INCHES OF RAIN FALLEN IN AND AROUND THE ROCKY 
RIVER WHICH IS NORTH OF SILER CITY. HEAVY RAINS WILL CONTINUE TO BE 
SLOW TO MOVE THROUGH CHATHAM COUNTY OVER THE NEXT HOUR OR 
SO...MAINLY NORTH OF HIGHWAY 64. 

* SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
  WARNED AREA.

$$
JWC
LAT...LON 3586 7895 3562 7898 3552 7954 3584 7954

08

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 12:16 PM EDTFlash Flood WarningRAHCumberland59 min
Sep 18, 2:42 PM EDTFlash Flood WarningRAHRandolph108 min
Sep 18, 2:55 PM EDTFlash Flood WarningRAHGuilford110 min
Sep 18, 3:04 PM EDTFlash Flood WarningRAHRandolph116 min
Sep 18, 4:30 PM EDTFlash Flood WarningRAHForsyth2 hr
Sep 18, 4:52 PM EDTFlash Flood WarningRAHRandolph98 min
Sep 18, 5:21 PM EDTFlash Flood WarningRAHDavidson99 min
Sep 18, 5:37 PM EDTFlash Flood WarningRAHMontgomery83 min
Sep 18, 5:51 PM EDTFlash Flood WarningRAHStanly84 min
Sep 18, 6:26 PM EDTFlash Flood WarningRAHForsyth94 min

Nearby

Flash Flood Warnings in North Carolina, 2002Every flash flood warning in 2002

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.