Alert archive / North Carolina / Flash Flood Warnings in 1998

Flash Flood Warning 31, NWS Raleigh, NC

September 4, 1998Alamance County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 4, 1998, 1:28 AM EDT for Alamance 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
Sep 4, 1998, 1:28 AM EDT (05:28 UTC)
Expired
Sep 4, 1998, 4:00 AM EDT
In force
3 hr
Issued by
NWS Raleigh, NC
Area
Whole counties

County Alamance County, NC

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 5.5 hours before the alert went out and 45 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 1998-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 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 1998-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.19395878Sfc1 km3 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
810 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
-86 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 KRDU 040529
FFWRDU
NCC001-040800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
128 AM EDT FRI SEP 4 1998

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ALAMANCE COUNTY

* UNTIL 400 AM EDT

* AT 125 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN MOVING SLOWLY WEST ACROSS ALAMANCE COUNTY. MUCH OF
  ALAMANCE COUNTY HAS RECEIVED BETWEEN 2 AND 3 INCHES OF RAIN SINCE
  THURSDAY AFTERNOON. AN ADDITIONAL 1 TO 2 INCHES OF RAIN IS
  LIKELY THROUGH 4 AM. THIS ADDITIONAL RAINFALL WILL CAUSE CREEKS
  AND STREAMS TO RISE QUICKLY OUT OF THEIR BANKS. IF YOU LIVE IN
  AN AREA KNOWN TO FLOOD DURING HEAVY RAIN EVENTS...SEEK HIGHER
  GROUND NOW! MOTORISTS NEED TO AVOID AREAS WHERE WATER OF
  UNKNOWN DEPTH COVERS THE ROAD.

DON'T DRIVE ACROSS FLOODED ROADS! MOST FLASH FLOOD DEATHS OCCUR IN
AUTOMOBILES.

WSS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 1:06 AM EDTFlash Flood WarningRAHMontgomery, Stanly3 hr
Sep 4, 2:16 AM EDTFlash Flood WarningRAHDurham, Granville, Orange, Person3 hr
Sep 4, 2:16 AM EDTFlash Flood WarningRAHDavidson, Randolph3 hr
Sep 4, 2:16 AM EDTFlash Flood WarningRAHAnson3 hr
Sep 4, 4:01 AM EDTFlash Flood WarningRAHStanly119 min
Sep 4, 4:01 AM EDTFlash Flood WarningRAHAlamance119 min
Sep 4, 5:21 AM EDTFlash Flood WarningRAHAnson119 min

Nearby

Flash Flood Warnings in North Carolina, 1998Every flash flood warning in 1998

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.