Alert archive / Delaware / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 54, NWS Philadelphia/Mount Holly

June 28, 2013New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2013, 4:20 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 55 min. 2 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: Jun 28, 2013, 4:20 PM EDT (20:20 UTC)
Expired: Jun 28, 2013, 5:15 PM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 96 km from the middle of the area, began a volume at 20:23 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 28, 4:23 PM EDT	TSTM WND DMG	Wilmington, DE	TREES DOWN ON BRACKENVILLE RD
Jun 28, 4:45 PM EDT	FUNNEL CLOUD	Newark, DE	FUNNEL CLOUD AND WALL CLOUDS OBSERVED FROM NEAR NEWARK TO THE BEAR AREA.

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 28, 2:08 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.3 hours before the alert went out and 168 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: 34 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1246 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

402 
WUUS51 KPHI 282020
SVRPHI
DEC003-MDC015-282115-
/O.NEW.KPHI.SV.W.0054.130628T2020Z-130628T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
420 PM EDT FRI JUN 28 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...

* UNTIL 515 PM EDT

* AT 418 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR PLEASANT HILL...MOVING EAST
  AT 15 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WIND GUSTS
  AND HAIL. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHERRY HILL AND ANDORA AROUND 425 PM EDT...
  ELKTON AROUND 430 PM EDT...
  BARKSDALE AROUND 435 PM EDT...
  APPLETON AROUND 440 PM EDT...
  GLEN WESTOVER AROUND 445 PM EDT...
  NEWARK AND GLASGOW AROUND 450 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3972 7594 3972 7578 3977 7574 3983 7552
      3971 7548 3971 7551 3962 7560 3959 7559
      3964 7557 3963 7556 3958 7556 3957 7557
      3955 7597 3971 7601
TIME...MOT...LOC 2020Z 259DEG 12KT 3966 7588

$$

FORECASTER:JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 3:33 PM EDT	Areal Flood Advisory	PHI	New Castle	117 min
Jun 28, 4:27 PM EDT	Tornado Warning	PHI	New Castle	33 min
Jun 28, 5:09 PM EDT	Flash Flood Warning	PHI	New Castle	11 hr
Jun 28, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	96 min
Jun 28, 6:48 PM EDT	River Flood Warning	PHI	New Castle	9 hr
Jun 28, 6:48 PM EDT	River Flood Warning	PHI	New Castle	8 hr
Jun 28, 3:19 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	41 min
Jun 28, 4:47 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	73 min
Jun 28, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	55 min
Jun 28, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	46 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2013 Severe Thunderstorm Warnings in Maryland, 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.