Alert archive / North Carolina / Flash Flood Warnings in 1998

Flash Flood Warning 21, NWS Raleigh, NC

March 20, 1998Orange County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Mar 20, 1998, 9:08 PM EST for Orange County, North Carolina. It was in force for 32 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
Mar 20, 1998, 9:08 PM EST (02:08 UTC)
Expired
Mar 20, 1998, 9:40 PM EST
In force
32 min
Issued by
NWS Raleigh, NC
Area
Whole counties

County Orange County, NC

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 2.1 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 1998-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 486 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 1998-03-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.1939587897Sfc1 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
486 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
840 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 20, 7:05 PM ESTSevere Thunderstorm WarningRAHDurham, Wake30 min
Mar 20, 7:24 PM ESTTornado WarningRAHFranklin31 min
Mar 20, 7:34 PM ESTSevere Thunderstorm WarningRAHGranville, Person46 min
Mar 20, 7:36 PM ESTSevere Thunderstorm WarningRAHChatham34 min
Mar 20, 7:49 PM ESTTornado WarningRAHWarren46 min
Mar 20, 7:58 PM ESTSevere Thunderstorm WarningRAHOrange47 min
Mar 20, 8:02 PM ESTSevere Thunderstorm WarningRAHHoke, Scotland48 min
Mar 20, 8:24 PM ESTFlash Flood WarningRAHDurham31 min
Mar 20, 8:24 PM ESTSevere Thunderstorm WarningRAHDurham31 min
Mar 20, 8:41 PM ESTSevere Thunderstorm WarningRAHHarnett34 min
Mar 20, 8:46 PM ESTTornado WarningRAHGranville49 min
Mar 20, 8:54 PM ESTTornado WarningRAHDurham, Wake36 min
Mar 20, 9:08 PM ESTSevere Thunderstorm WarningRAHOrange32 min
Mar 20, 9:20 PM ESTSevere Thunderstorm WarningRAHCumberland20 min
Mar 20, 9:27 PM ESTSevere Thunderstorm WarningRAHVance33 min
Mar 20, 9:35 PM ESTSevere Thunderstorm WarningRAHDurham30 min
Mar 20, 9:52 PM ESTSevere Thunderstorm WarningRAHJohnston, Wake18 min
Mar 20, 10:21 PM ESTSevere Thunderstorm WarningRAHNash, Wilson34 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.