Alert archive / Delaware / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 27, NWS Philadelphia/Mount Holly

June 13, 2013Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 13, 2013, 5:12 PM EDT for Kent County, Delaware. It was in force for 63 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: Jun 13, 2013, 5:12 PM EDT (21:12 UTC)
Expired: Jun 13, 2013, 6:15 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 42 km from the middle of the area, began a volume at 21:13 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
Jun 13, 5:30 PM EDT	TSTM WND DMG	Dover, DE	SEVERAL TREES UPROOTED INCLUDING ON NORTH BRADFORD STREET.

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
Jun 13, 12:19 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 56 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: 416 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

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

911 
WUUS51 KPHI 132112
SVRPHI
DEC001-132215-
/O.NEW.KPHI.SV.W.0027.130613T2112Z-130613T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
512 PM EDT THU JUN 13 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 615 PM EDT

* AT 509 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR CHURCH HILL...MOVING EAST
  AT 55 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...
  AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HARTLY AND SANDTOWN AROUND 525 PM EDT...
  HAZLETTVILLE AND WOODSIDE AROUND 530 PM EDT...
  CAMDEN AND RISING SUN AROUND 535 PM EDT...
  BOWERS AND WOODLAND BEACH AROUND 540 PM EDT...
  BOWERS AROUND 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS SEVERE THUNDERSTORM HAS A HISTORY OF PRODUCING WIND DAMAGE
ACROSS MARYLAND.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
THURSDAY EVENING FOR SOUTHERN DELAWARE AND NORTHEASTERN MARYLAND.

&&

LAT...LON 3929 7576 3930 7570 3929 7565 3931 7562
      3931 7558 3933 7557 3934 7547 3916 7540
      3906 7539 3903 7534 3897 7532 3887 7572
TIME...MOT...LOC 2112Z 270DEG 47KT 3911 7591

$$

NIERENBERG

1 follow-up statement

995 
WWUS51 KPHI 132154
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
554 PM EDT THU JUN 13 2013

DEC001-132205-
/O.CAN.KPHI.SV.W.0027.000000T0000Z-130613T2215Z/
KENT DE-
554 PM EDT THU JUN 13 2013

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

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
THURSDAY EVENING FOR SOUTHERN DELAWARE AND NORTHEASTERN MARYLAND.

LAT...LON 3929 7576 3930 7570 3929 7565 3931 7562
      3931 7558 3933 7557 3934 7547 3916 7540
      3906 7539 3903 7534 3897 7532 3887 7572
TIME...MOT...LOC 2155Z 270DEG 47KT 3911 7519

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 1:49 AM EDT	Special Weather Statement	PHI	Sussex	41 min
Jun 13, 8:40 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	50 min
Jun 13, 9:18 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	57 min
Jun 13, 9:29 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	31 min
Jun 13, 9:39 AM EDT	Special Weather Statement	PHI	Kent	51 min
Jun 13, 9:55 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	35 min
Jun 13, 10:24 AM EDT	Special Weather Statement	PHI	Kent, Sussex	81 min
Jun 13, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	65 min
Jun 13, 4:51 PM EDT	Special Weather Statement	PHI	Kent	54 min
Jun 13, 5:04 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	4 hr
Jun 13, 5:19 PM EDT	Special Weather Statement	PHI	New Castle	56 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2013 Every severe thunderstorm warning in 2013

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.