Alert archive / Delaware / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 51, NWS Philadelphia/Mount Holly

June 25, 2012Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 25, 2012, 8:49 AM EDT for Sussex County, Delaware. It was in force for 26 min. 4 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 25, 2012, 8:49 AM EDT (12:49 UTC)
Expired: Jun 25, 2012, 9:15 AM EDT
In force: 26 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 34 km from the middle of the area, began a volume at 12:52 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 25, 9:00 AM EDT	TSTM WND DMG	Millsboro, DE	TREE DOWN. TIME ESTIMATED FROM RADAR.
Jun 25, 9:03 AM EDT	TSTM WND DMG	Oak Orchard, DE	A FEW TREES KNOCKED DOWN INTO HOMES AND SHEDS ALONG BANKS ROAD AND CANAL DRIVE IN OAK ORCHARD
Jun 25, 9:05 AM EDT	TSTM WND DMG	Long Neck, DE	NUMEROUS TREES DOWN AND A POLE BARN UNDER CONSTRUCTION COLLAPSED
Jun 25, 9:13 AM EDT	TSTM WND GST 69	Dewey Beach, DE	69 MPH GUST MEASURED AT DEWEY BEACH

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 0.8 hours before the alert went out and 80 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: 851 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1274 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

582 
WUUS51 KPHI 251249
SVRPHI
DEC005-251315-
/O.NEW.KPHI.SV.W.0051.120625T1249Z-120625T1315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
849 AM EDT MON JUN 25 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 915 AM EDT

* AT 847 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED NEAR MILLSBORO...OR
  ALONG A LINE EXTENDING FROM 7 MILES SOUTHEAST OF GEORGETOWN TO 11
  MILES SOUTH OF GEORGETOWN...AND MOVING EAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MILLVILLE AROUND 900 AM EDT...
  REHOBOTH BEACH AND BETHANY BEACH AROUND 905 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 PM EDT MONDAY
AFTERNOON FOR NORTHERN DELAWARE AND NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

&&

LAT...LON 3852 7538 3862 7541 3875 7507 3874 7507
      3867 7506 3867 7505 3862 7505 3861 7504
      3850 7504
TIME...MOT...LOC 1249Z 255DEG 42KT 3862 7529 3854 7528

$$
DRAG

1 follow-up statement

920 
WWUS51 KPHI 251303
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
903 AM EDT MON JUN 25 2012

DEC005-251315-
/O.CON.KPHI.SV.W.0051.000000T0000Z-120625T1315Z/
SUSSEX DE-
903 AM EDT MON JUN 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 AM EDT
FOR EAST CENTRAL SUSSEX COUNTY...

AT 900 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM LONG NECK TO MILLVILLE...OR ALONG A LINE EXTENDING
FROM 14 MILES EAST OF GEORGETOWN TO 17 MILES SOUTHEAST OF
GEORGETOWN...MOVING EAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 PM EDT MONDAY
AFTERNOON FOR NORTHERN DELAWARE AND NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

&&

LAT...LON 3856 7529 3865 7526 3875 7507 3874 7507
      3867 7506 3867 7505 3862 7505 3861 7504
      3851 7504
TIME...MOT...LOC 1303Z 255DEG 42KT 3866 7509 3858 7508

$$
DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 12:25 AM EDT	Special Weather Statement	PHI	Kent	95 min
Jun 25, 8:32 AM EDT	Special Weather Statement	PHI	Sussex	28 min
Jun 25, 9:17 AM EDT	Special Weather Statement	PHI	Sussex	13 min
Jun 25, 10:14 AM EDT	Special Weather Statement	PHI	Sussex	61 min
Jun 25, 10:53 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	26 min
Jun 25, 1:46 PM EDT	Special Weather Statement	PHI	Sussex	29 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2012 Every severe thunderstorm warning in 2012

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.