Alert archive / Delaware / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Philadelphia/Mount Holly

February 24, 2012Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 24, 2012, 4:14 PM EST for Sussex County, Delaware. It was in force for 31 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: Feb 24, 2012, 4:14 PM EST (21:14 UTC)
Expired: Feb 24, 2012, 4:45 PM EST
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 26 km from the middle of the area, began a volume at 21:14 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
Feb 24, 4:17 PM EST	TSTM WND DMG	Blades, DE	ROOF BLOWN OFF... WIRES DOWN... POLES DOWN... LARGE TREE DOWN
Feb 24, 4:17 PM EST	HAIL 1	Blades, DE

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, 9.2 hours before the alert went out and 81 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: 50 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 336 m²/s²
0-3 km storm-relative helicity: 348 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

691 
WUUS51 KPHI 242114
SVRPHI
DEC005-242145-
/O.NEW.KPHI.SV.W.0002.120224T2114Z-120224T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
414 PM EST FRI FEB 24 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SUSSEX COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF GEORGETOWN...

* UNTIL 445 PM EST

* AT 405 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  SEAFORD...OR 17 MILES WEST OF GEORGETOWN...AND MOVING EAST AT 65   
  MPH. ANOTHER STORM WILL MOVE INTO THE SOUTHWEST CORNER OF SUSSEX   
  COUNTY. 

* THE SEVERE THUNDERSTORM WILL CONTINUE TO AFFECT CENTRAL AND        
  SOUTHERN SUXXEX COUNTY DELAWARE THROUGH 445 PM. 

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.

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.

&&

LAT...LON 3845 7559 3846 7570 3874 7570 3895 7532
      3880 7517 3879 7511 3881 7510 3880 7508
      3867 7505 3862 7505 3861 7504 3845 7504
      3844 7505
TIME...MOT...LOC 2112Z 254DEG 57KT 3866 7555

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 3:40 AM EST	Wind Advisory	PHI	Kent, New Castle, Sussex	42 hr
Feb 24, 3:49 PM EST	Special Weather Statement	PHI	Kent	26 min
Feb 24, 4:07 PM EST	Special Weather Statement	PHI	Kent, Sussex	53 min
Feb 24, 5:03 PM EST	Special Weather Statement	PHI	Sussex	42 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.