Alert archive / Delaware / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 25, NWS Philadelphia/Mount Holly

April 7, 2016Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 7, 2016, 6:37 PM EDT for Kent County, New Castle County, Sussex County, Delaware. It was in force for 38 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 7, 2016, 6:37 PM EDT (22:37 UTC)
Expired: Apr 7, 2016, 7:15 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 22 km from the middle of the area, began a volume at 22:36 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.

What was reported inside it

Time	Report	Where	Remark
Apr 7, 6:39 PM EDT	TSTM WND DMG	Kenton, DE	A TREE REPORTED DOWN INTO WIRES
Apr 7, 6:49 PM EDT	TSTM WND GST 52	Dover Air Force Base, DE
Apr 7, 7:05 PM EDT	MARINE TSTM WIND 52	Lewes, DE	45 KNOT GUST.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.6 hours before the alert went out and 75 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: 32 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 605 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 299 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

330 
WUUS51 KPHI 072237
SVRPHI
DEC001-003-005-072315-
/O.NEW.KPHI.SV.W.0025.160407T2237Z-160407T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
637 PM EDT THU APR 7 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  KENT COUNTY IN CENTRAL DELAWARE...
  NORTHERN SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 715 PM EDT

* AT 636 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING AREAS OF DAMAGING WINDS IN
  EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM NEAR HARTLY TO NEAR HARRINGTON TO BRIDGEVILLE...AND MOVING
  NORTHEAST AT 50 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THE
  DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  DOVER...GEORGETOWN...SMYRNA...MILFORD...SEAFORD...HARRINGTON...CAMDEN...
  CLAYTON...LEWES...MILTON...BRIDGEVILLE...CHESWOLD...ELLENDALE...BOWERS...
  WOODSIDE...VIOLA...HARTLY...ANDREWSVILLE...DELANEY CORNER AND RISING
  SUN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 3863 7565 3892 7568 3913 7575 3936 7576
      3944 7558 3935 7549 3933 7550 3931 7544
      3927 7541 3907 7541 3899 7532 3891 7531
      3880 7518 3878 7513 3879 7510 3875 7508
TIME...MOT...LOC 2236Z 225DEG 42KT 3919 7574 3897 7563 3874 7561 

$$

GORSE

1 follow-up statement

530 
WWUS51 KPHI 072253
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
653 PM EDT THU APR 7 2016

DEC001-003-005-072315-
/O.CON.KPHI.SV.W.0025.000000T0000Z-160407T2315Z/
NEW CASTLE DE-KENT DE-SUSSEX DE-
653 PM EDT THU APR 7 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTH CENTRAL NEW CASTLE...CENTRAL KENT AND NORTHEASTERN SUSSEX
COUNTIES...

AT 652 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING AREAS OF DAMAGING WINDS IN EXCESS
OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
SMYRNA TO NEAR DOVER SPEEDWAY TO NEAR BOWERS TO NEAR
ELLENDALE...MOVING NORTHEAST AT 55 MPH. HAIL UP TO THE SIZE OF
PENNIES MAY ALSO ACCOMPANY THE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
DOVER...GEORGETOWN...SMYRNA...MILFORD...CAMDEN...LEWES...MILTON...CHESWOLD...
ELLENDALE...BOWERS...DOVER SPEEDWAY...DOVER BASE HOUSING...RISING
SUN-LEBANON...RISING SUN...WYOMING...FREDERICA...MAGNOLIA...LITTLE CREEK...
LEIPSIC AND RIVERVIEW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL... DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 3868 7540 3890 7548 3941 7565 3944 7558
      3935 7549 3933 7550 3931 7544 3927 7541
      3907 7541 3899 7532 3891 7531 3880 7518
      3878 7513 3879 7510 3875 7508
TIME...MOT...LOC 2252Z 228DEG 48KT 3930 7559 3920 7548 3909 7544 3884
7541

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 8:07 PM EDT	Coastal Flood Advisory	PHI	New Castle	5 hr
Apr 7, 3:30 AM EDT	Wind Advisory	PHI	Kent, New Castle, Sussex	12 hr
Apr 7, 10:49 AM EDT	Special Weather Statement	PHI	Kent, New Castle, Sussex	86 min
Apr 7, 12:08 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	37 min
Apr 7, 12:22 PM EDT	Special Weather Statement	PHI	New Castle	38 min
Apr 7, 3:16 PM EDT	Special Weather Statement	PHI	Sussex	44 min
Apr 7, 6:19 PM EDT	Special Weather Statement	PHI	New Castle	56 min
Apr 7, 6:27 PM EDT	Special Weather Statement	PHI	Kent, Sussex	48 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2016 Every severe thunderstorm warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.