Alert archive / Maryland / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 18, NWS Philadelphia/Mount Holly

April 9, 2001Kent County, Delaware; Caroline County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 2001, 8:56 PM EDT for Kent County, Delaware; Caroline County, Queen Anne's County, Maryland. It was in force for 34 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: Apr 9, 2001, 8:56 PM EDT (00:56 UTC)
Expired: Apr 9, 2001, 9:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Kent County, DE, Caroline County, MD, Queen Anne's County, MD

What was reported inside it

Time	Report	Where	Remark
Apr 9, 9:10 PM EDT	Thunderstorm Wind 52 E	Smyrna, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 7:00 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.9 hours before the alert went out and 124 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: 218 J/kg
Mixed-layer CIN: -432 J/kg
Mixed-layer LCL: 1819 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 100057
SVRPHL
DEC001-MDC011-015-035-041-NJC011-100130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
856 PM EDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE.
  CAROLINE COUNTY IN EASTERN MARYLAND.
  TALBOT COUNTY IN EASTERN MARYLAND.
  QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND.
  EXTREME SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND.
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY.

* UNTIL 930 PM EDT.

* AT 853 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  AN AREA OF SEVERE THUNDERSTORMS OVER NORTHEAST MARYLAD AND NORTHERN
  DELAWARE MOVING SOUTHEAST AT 55 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  FAIRTON...BRIDGETON...ROSENHAYN...BOWERS AT 905 PM.
  MILLVILLE...VINELAND AT 915 PM.

DAMAGING WINDS IN EXCESS OF 60 MPH ARE EXPECTED FROM THIS STORM. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THE STORM HAS PASSED.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 60 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MO4UNT HOLLY.

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

$$

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	38 min
Apr 9, 8:02 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	43 min
Apr 9, 8:56 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	34 min
Apr 9, 8:56 PM EDT	Severe Thunderstorm Warning	PHI	Talbot	34 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2001 Severe Thunderstorm Warnings in Delaware, 2001 Every severe thunderstorm warning in 2001

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.