Alert archive / Delaware / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 160, NWS Philadelphia/Mount Holly

July 28, 2016Kent County, Sussex County, Delaware; Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2016, 6:25 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Maryland. It was in force for 65 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, 6:25 PM EDT (22:25 UTC)
Expired: Jul 28, 2016, 7:30 PM EDT
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 5 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 95 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.

328 
WUUS51 KPHI 282225
SVRPHI
DEC001-005-MDC011-282330-
/O.NEW.KPHI.SV.W.0160.160728T2225Z-160728T2330Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...
  SOUTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...

* UNTIL 730 PM EDT

* AT 625 PM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR BOWERS TO NEAR HARRINGTON TO AGNER...MOVING
  SOUTHEAST AT 25 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...
  GEORGETOWN...MILFORD...SEAFORD...MILLSBORO...LAUREL...HARRINGTON...
  LEWES...MILTON...BRIDGEVILLE...DELMAR...ELLENDALE...BOWERS...
  ANDREWSVILLE...SYCAMORE...CAPE HENLOPEN STATE PARK...SMITHVILLE...
  FELTON...BLADES...GREENWOOD AND FREDERICA.

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 3846 7569 3864 7571 3868 7576 3885 7579
      3894 7568 3913 7539 3911 7537 3905 7537
      3892 7528 3881 7514 3881 7506 3867 7519
      3845 7550
TIME...MOT...LOC 2225Z 303DEG 21KT 3903 7546 3890 7562 3876 7578 

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

ROBERTSON

2 follow-up statements

552 
WWUS51 KPHI 282304
SVSPHI

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

DEC001-282314-
/O.CAN.KPHI.SV.W.0160.000000T0000Z-160728T2330Z/
KENT DE-
704 PM EDT THU JUL 28 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN KENT COUNTY IS
CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED
AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
SOUTHERN AND CENTRAL DELAWARE...AND EASTERN MARYLAND.

LAT...LON 3846 7569 3864 7571 3868 7576 3895 7530
      3892 7528 3881 7514 3881 7506 3867 7519
      3845 7550
TIME...MOT...LOC 2304Z 303DEG 21KT 3891 7523 3878 7539 3864 7555 

$$

DEC005-MDC011-282330-
/O.CON.KPHI.SV.W.0160.000000T0000Z-160728T2330Z/
SUSSEX DE-CAROLINE MD-
704 PM EDT THU JUL 28 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SUSSEX AND SOUTHEASTERN CAROLINE COUNTIES...

AT 704 PM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 8 MILES SOUTHEAST OF BIG STONE BEACH TO NEAR ELLENDALE
TO NEAR SEAFORD...MOVING SOUTHEAST AT 25 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...
GEORGETOWN...SEAFORD...MILLSBORO...LAUREL...LEWES...MILTON...
BRIDGEVILLE...DELMAR...ELLENDALE...SYCAMORE...
CAPE HENLOPEN STATE PARK...BLADES AND BETHEL.

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 3846 7569 3864 7571 3868 7576 3895 7530
      3892 7528 3881 7514 3881 7506 3867 7519
      3845 7550
TIME...MOT...LOC 2304Z 303DEG 21KT 3891 7523 3878 7539 3864 7555 

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

ROBERTSON

962 
WWUS51 KPHI 282323
SVSPHI

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

DEC005-MDC011-282332-
/O.EXP.KPHI.SV.W.0160.000000T0000Z-160728T2330Z/
SUSSEX DE-CAROLINE MD-
723 PM EDT THU JUL 28 2016

...THE SEVERE THUNDERSTORM WARNING FOR SUSSEX AND SOUTHEASTERN
CAROLINE COUNTIES WILL EXPIRE AT 730 PM EDT...
            
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE AND HAS BEEN
REPLACED BY A SPECIAL WEATHER STATEMENT GUSTY WINDS AND HEAVY RAIN
ARE STILL POSSIBLE WITH THESE THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
SOUTHERN AND CENTRAL DELAWARE...AND EASTERN MARYLAND.

LAT...LON 3846 7569 3864 7571 3868 7576 3895 7530
      3892 7528 3881 7514 3881 7506 3867 7519
      3845 7550
TIME...MOT...LOC 2321Z 303DEG 21KT 3891 7523 3878 7539 3864 7555 

$$

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, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	Kent	47 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, 6:53 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 28, 7:22 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Jul 28, 12:52 PM EDT	Tornado Warning Tornado observed	PHI	Caroline, Talbot	23 min
Jul 28, 3:52 PM EDT	Special Weather Statement	PHI	Kent	38 min
Jul 28, 4:31 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	44 min
Jul 28, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	46 min
Jul 28, 5:56 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	49 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2016 Severe Thunderstorm Warnings in Maryland, 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.