Alert archive / Delaware / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 68, NWS Philadelphia/Mount Holly

May 18, 2002Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 18, 2002, 8:21 AM EDT for Sussex County, Delaware. It was in force for 39 min. 1 report 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 18, 2002, 8:21 AM EDT (12:21 UTC)
Expired
May 18, 2002, 9:00 AM EDT
In force
39 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Sussex County, DE

What was reported inside it

TimeReportWhereRemark
May 18, 8:30 AM EDTThunderstorm Wind 50 EBridgeville, DE

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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 0.4 hours before the alert went out and 84 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, Wallops Is Stn, VA at 12:00Z on 2002-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 706 joules per kilogram.LCLLFCEL10008507005003002001001 km2 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, Wallops Is Stn, VA at 12:00Z on 2002-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 312 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
706 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
563 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
312 m²/s²
0-3 km storm-relative helicity
282 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.7

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 181221
SVRPHI
DEC005-181300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
821 AM EDT SAT MAY 18 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SUSSEX COUNTY IN SOUTHERN DELAWARE.

* UNTIL 900 AM EDT.

* AT 815 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
STORMS THAT WERE BRINGING STRONG WINDS FROM ABOVE THE SURFACE DOWN 
TO THE SURFACE. THE STORMS WERE ENTERING SUSSEX COUNTY ABOUT 25 
MILES SOUTHWEST OF GEORGETOWN...MOVING EAST AT ABOUT 40 MPH. 

WINDS TO 70 MPH COULD AFFECT MUCH OF SUSSEX COUNTY THROUGH 900 AM. 

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.

$$

LAT...LON 3878 7570 3850 7566 3848 7508 3892 7534

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 8:31 AM EDTSevere Thunderstorm WarningPHIKent29 min
May 18, 9:00 AM EDTSevere Thunderstorm WarningPHISussex50 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2002Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.