Alert archive / Delaware / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 103, NWS Philadelphia/Mount Holly

August 13, 1997Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 1997, 5:54 PM EDT for Sussex County, Delaware. 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: Aug 13, 1997, 5:54 PM EDT (21:54 UTC)
Expired: Aug 13, 1997, 6:55 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 18 km from the middle of the area, began a volume at 21:58 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.9 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-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: 1957 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 48 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.

312 
WUUS1 KPHL 132154
SVRPHL
DEC005-132255-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING...CORRECTED
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
554 PM EDT WED AUG 13 1997

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 655 PM EDT
FOR THE FOLLOWING LOCATIONS...

IN  DELAWARE

   ...EASTERN SUSSEX COUNTY

AND A SPECIAL MARINE WARNING EFFECTIVE UNTIL 655 PM EDT
FOR THE ATLANTIC COASTAL WATERS FROM CAPE HENLOPEN DE TO
FENWICK ISLAND DE.

AT 550PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE
THUNDERSTORM JUST SOUTH OF MILLSBORO MOVING NORTHEAST AT AROUND 20
MPH.  THIS STORM WILL PASS CLOSE TO DAGSBORO AND INDIAN RIVER INLET
BY 615 PM.

THIS IS A DANGEROUS STORM. MOVE INSIDE A STRONG BUILDING AND DO NOT
STAND NEAR WINDOWS. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

MARINERS SHOULD USE EXTREME CAUTION AND MOVE TO PROTECTED WATERS TO
AVOID DAMAGING WINDS AND SEAS. MAKE SURE YOU AND YOUR CREW ARE
WEARING APPROVED FLOTATION DEVICES...ESPECIALLY WITH APPROACHING
BAD WEATHER. AVOID HEADING INTO THE STORM WHILE SEEKING SAFE HAVEN.
BOATS IN PORT SHOULD NOT VENTURE OUT UNTIL THE STORM HAS PASSED.

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE
TELEVISION OUTLET. MARINERS SHOULD MONITOR NOAA WEATHER RADIO OR
MARINE CHANNEL 16.

TFG/JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	51 min

Nearby

Severe Thunderstorm Warnings in Delaware, 1997 Every severe thunderstorm warning in 1997

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.