Alert archive / Delaware / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 176, NWS Philadelphia/Mount Holly

August 9, 2012Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2012, 1:17 PM EDT for Sussex County, Delaware. It was in force for 43 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: Aug 9, 2012, 1:17 PM EDT (17:17 UTC)
Expired: Aug 9, 2012, 2:00 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 20 km from the middle of the area, began a volume at 17:19 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
Aug 9, 1:55 PM EDT	TSTM WND DMG	Lewes, DE	TREES DOWN

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, 5.3 hours before the alert went out and 98 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: 2382 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: -27 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.

722 
WUUS51 KPHI 091717
SVRPHI
DEC005-091800-
/O.NEW.KPHI.SV.W.0176.120809T1717Z-120809T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
117 PM EDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 200 PM EDT

* AT 115 PM EDT...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
  MILTON...OR 11 MILES NORTHEAST OF GEORGETOWN...AND MOVING EAST AT
  10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LEWES AROUND 155 PM EDT...
  CAPE HENLOPEN STATE PARK AND 7 MILES NORTH OF REHOBOTH BEACH AROUND
  200 PM 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.

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 3875 7542 3892 7541 3892 7529 3879 7515
      3879 7511 3880 7511 3881 7509 3878 7507
      3868 7506
TIME...MOT...LOC 1716Z 278DEG 10KT 3882 7527

$$
 
TFG

1 follow-up statement

240 
WWUS51 KPHI 091732
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
132 PM EDT THU AUG 9 2012

DEC005-091800-
/O.CON.KPHI.SV.W.0176.000000T0000Z-120809T1800Z/
SUSSEX DE-
132 PM EDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHEASTERN SUSSEX COUNTY...

AT 127 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR MILTON...OR 10 MILES NORTHEAST OF GEORGETOWN...MOVING
SOUTHEAST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  LEWES...8 MILES WEST OF CAPE HENLOPEN STATE PARK AND 9 MILES
  NORTHWEST OF REHOBOTH BEACH BY 200 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 WILL 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.

&&

LAT...LON 3876 7540 3888 7525 3879 7515 3879 7511
      3880 7511 3881 7509 3878 7507 3868 7506
TIME...MOT...LOC 1732Z 309DEG 6KT 3880 7527

$$

 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 12:34 PM EDT	Special Weather Statement	PHI	Kent	56 min
Aug 9, 1:04 PM EDT	Severe Thunderstorm Warning	PHI	Kent	23 min
Aug 9, 1:39 PM EDT	Special Weather Statement	PHI	Kent	66 min
Aug 9, 1:55 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	65 min
Aug 9, 2:04 PM EDT	Special Weather Statement	PHI	Kent	56 min
Aug 9, 2:19 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	56 min
Aug 9, 2:23 PM EDT	Special Weather Statement	PHI	Sussex	52 min
Aug 9, 3:17 PM EDT	Special Weather Statement	PHI	Sussex	88 min
Aug 9, 3:42 PM EDT	Areal Flood Advisory	PHI	Sussex	119 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.