Alert archive / North Carolina / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 101, NWS Raleigh, NC

May 20, 1998Alamance County, Guilford County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at May 20, 1998, 4:01 PM EDT for Alamance County, Guilford County, North Carolina. It was in force for 34 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 20, 1998, 4:01 PM EDT (20:01 UTC)
Expired: May 20, 1998, 4:35 PM EDT
In force: 34 min
Issued by: NWS Raleigh, NC
Area: Whole counties

Counties Alamance County, NC, Guilford County, NC

What was reported inside it

Time	Report	Where	Remark
May 20, 4:15 PM EDT	Hail 1	Guilford, NC
May 20, 4:20 PM EDT	Hail 0.75	Snow Camp, NC

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.0 hours before the alert went out and 28 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 68 J/kg
Mixed-layer CIN: -336 J/kg
Mixed-layer LCL: 1739 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 246 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.

825 
WUUS1 KRDU 202002 RRA
SVRRDU
NCC001-081-202035-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
401 PM EDT WED MAY 20 1998

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ALAMANCE COUNTY
  SOUTHEASTERN GUILFORD COUNTY

* UNTIL 435 PM EDT

* AT 4 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM EXTREME SOUTHEAST GUILFORD COUNTY... MOVING
  SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KIMESVILLE AT 405 PM
  SNOW CAMP NEAR 415 PM

THIS IS A DANGEROUS STORM STAY INDOORS AWAY FROM WINDOWS.

RLH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 3:32 PM EDT	Severe Thunderstorm Warning	RAH	Guilford	33 min
May 20, 4:16 PM EDT	Severe Thunderstorm Warning	RAH	Chatham	29 min
May 20, 5:19 PM EDT	Severe Thunderstorm Warning	RAH	Randolph	16 min
May 20, 6:06 PM EDT	Severe Thunderstorm Warning	RAH	Randolph	34 min
May 20, 6:11 PM EDT	Severe Thunderstorm Warning	RAH	Moore	34 min
May 20, 6:46 PM EDT	Severe Thunderstorm Warning	RAH	Moore	29 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 1998 Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.