Alert archive / Delaware / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 152, NWS Philadelphia/Mount Holly

July 28, 2016Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2016, 2:30 PM EDT for Kent County, Delaware. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 28, 2016, 2:30 PM EDT (18:30 UTC)
Expired: Jul 28, 2016, 3:17 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 50 km from the middle of the area, began a volume at 18:30 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 28, 1:27 PM EDT	Severe Thunderstorm Watch	SPC	11 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.5 hours before the alert went out and 149 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: 1169 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1097 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

776 
WUUS51 KPHI 281830 RRA
SVRPHI
DEC001-281930-
/O.NEW.KPHI.SV.W.0152.160728T1830Z-160728T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
230 PM EDT THU JUL 28 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN KENT COUNTY IN CENTRAL DELAWARE...

* UNTIL 330 PM EDT

* AT 230 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DOVER
  SPEEDWAY...OR NEAR DOVER...MOVING NORTHEAST AT 10 MPH.

  HAZARD...PING PONG BALL SIZE HAIL AND 60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL 
           DAMAGE TO ROOFS...SIDING...WINDOWS...AND VEHICLES. EXPECT 
           WIND DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  DOVER...SMYRNA...CHESWOLD...DOVER SPEEDWAY...WOODLAND BEACH...
  DOVER BASE HOUSING...RISING SUN-LEBANON...LITTLE CREEK...LEIPSIC...
  KENT ACRES...HIGHLAND ACRES AND RODNEY VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3924 7566 3939 7549 3929 7539 3930 7537
      3939 7548 3940 7548 3922 7523 3923 7526
      3929 7536 3928 7539 3927 7537 3917 7537
      3911 7551
TIME...MOT...LOC 1830Z 227DEG 9KT 3923 7552 

HAIL...1.50IN
WIND...60MPH
 
$$

ROBERTSON

2 follow-up statements

407 
WWUS51 KPHI 281852
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
252 PM EDT THU JUL 28 2016

DEC001-281930-
/O.CON.KPHI.SV.W.0152.000000T0000Z-160728T1930Z/
KENT DE-
252 PM EDT THU JUL 28 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHEASTERN KENT COUNTY...

AT 252 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DOVER
SPEEDWAY... OR NEAR DOVER...MOVING NORTHEAST AT 10 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
DOVER...SMYRNA...CHESWOLD...DOVER SPEEDWAY...WOODLAND BEACH...
DOVER BASE HOUSING...RISING SUN-LEBANON...LITTLE CREEK...LEIPSIC...
KENT ACRES...HIGHLAND ACRES AND RODNEY VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3924 7566 3937 7551 3931 7542 3917 7537
      3911 7551
TIME...MOT...LOC 1852Z 228DEG 7KT 3925 7549 

HAIL...1.00IN
WIND...60MPH
 
$$

ROBERTSON

635 
WWUS51 KPHI 281917
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
317 PM EDT THU JUL 28 2016

DEC001-281926-
/O.CAN.KPHI.SV.W.0152.000000T0000Z-160728T1930Z/
KENT DE-
317 PM EDT THU JUL 28 2016

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT COUNTY IS
CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND HAVE EXITED THE WARNED AREA. THEREFORE THE WARNING HAS
BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
NORTHERN AND CENTRAL DELAWARE.

LAT...LON 3924 7566 3937 7551 3931 7542 3917 7537
      3911 7551
TIME...MOT...LOC 1916Z 227DEG 9KT 3929 7543 

$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 1:20 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	40 min
Jul 28, 1:24 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	51 min
Jul 28, 1:42 PM EDT	Special Weather Statement	PHI	New Castle	33 min
Jul 28, 1:58 PM EDT	Special Weather Statement	PHI	Sussex	62 min
Jul 28, 2:36 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 28, 2:44 PM EDT	Areal Flood Advisory	PHI	Kent	4 hr
Jul 28, 3:54 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 28, 4:38 PM EDT	Special Weather Statement	PHI	Kent	52 min
Jul 28, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Kent	38 min
Jul 28, 4:56 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Jul 28, 5:24 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	51 min
Jul 28, 6:12 PM EDT	Special Weather Statement	PHI	Kent	48 min
Jul 28, 6:15 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Jul 28, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	65 min
Jul 28, 6:53 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 28, 7:22 PM EDT	Special Weather Statement	PHI	Sussex	38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.