Alert archive / Delaware / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 157, NWS Philadelphia/Mount Holly

July 28, 2016Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2016, 5:24 PM EDT for Kent County, Sussex County, Delaware. It was in force for 51 min. 1 report 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: Jul 28, 2016, 5:24 PM EDT (21:24 UTC)
Expired: Jul 28, 2016, 6:15 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 25 km from the middle of the area, began a volume at 21:27 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
Jul 28, 5:26 PM EDT	TSTM WND GST 63	Dover Air Force Base, DE

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

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, 9.4 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: 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.

665 
WUUS51 KPHI 282124
SVRPHI
DEC001-005-282215-
/O.NEW.KPHI.SV.W.0157.160728T2124Z-160728T2215Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL KENT COUNTY IN CENTRAL DELAWARE...
  NORTHERN SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 615 PM EDT

* AT 524 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER DOVER BASE
  HOUSING...OR NEAR DOVER...MOVING SOUTHEAST AT 20 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...CAMDEN...BOWERS...WOODSIDE...DOVER BASE HOUSING...
  RISING SUN-LEBANON...BIG STONE BEACH...RISING SUN...FREDERICA...
  MAGNOLIA...RIVERVIEW...WOODSIDE EAST AND HIGHLAND ACRES.

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 3908 7560 3917 7542 3916 7537 3905 7537
      3901 7533 3892 7527 3889 7531
TIME...MOT...LOC 2124Z 309DEG 16KT 3910 7543 

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

ROBERTSON

1 follow-up statement

874 
WWUS51 KPHI 282205
SVSPHI

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

DEC001-005-282215-
/O.EXP.KPHI.SV.W.0157.000000T0000Z-160728T2215Z/
KENT DE-SUSSEX DE-
605 PM EDT THU JUL 28 2016

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL KENT AND NORTHERN
SUSSEX COUNTIES WILL EXPIRE AT 615 PM EDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND HAVE EXITED THE WARNED AREA. THEREFORE THE WARNING WILL
BE ALLOWED TO EXPIRE.

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

LAT...LON 3908 7560 3917 7542 3916 7537 3905 7537
      3901 7533 3892 7527 3889 7531
TIME...MOT...LOC 2204Z 309DEG 16KT 3910 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, 2:30 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.