Alert archive / Delaware / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly

June 24, 2010Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 24, 2010, 7:14 PM EDT for Sussex County, Delaware. It was in force for 50 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 24, 2010, 7:14 PM EDT (23:14 UTC)
Expired: Jun 24, 2010, 8:04 PM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 33 km from the middle of the area, began a volume at 23:14 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
Jun 24, 7:35 PM EDT	TSTM WND GST 60	Fenwick Island, DE	60 MPH WIND GUST ESTIMATED AT FENWICK ISLAND WITH LARGE TREE LIMBS DOWN.

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 24, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.2 hours before the alert went out and 69 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: 134 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 1749 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

313 
WUUS51 KPHI 242314
SVRPHI
DEC005-250015-
/O.NEW.KPHI.SV.W.0085.100624T2314Z-100625T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
714 PM EDT THU JUN 24 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 815 PM EDT

* AT 709 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM REHOBOTH BEACH TO 9 MILES
  SOUTHWEST OF LAUREL...OR ALONG A LINE EXTENDING FROM 17 MILES EAST
  OF GEORGETOWN TO 10 MILES NORTHWEST OF SALISBURY...AND MOVING
  SOUTHEAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  DAGSBORO AROUND 720 PM EDT...
  GUMBORO AND MILLVILLE AROUND 725 PM EDT...
  BETHANY BEACH AROUND 730 PM EDT...
  SELBYVILLE AROUND 735 PM EDT...
  FENWICK ISLAND AROUND 740 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! LIGHTNING IS ONE OF NATURES GREATEST KILLERS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR SOUTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
SOUTHERN NEW JERSEY.

&&

LAT...LON 3845 7564 3847 7571 3855 7571 3877 7507
      3865 7505 3863 7506 3860 7504 3846 7503
      3844 7505
TIME...MOT...LOC 2314Z 300DEG 29KT 3867 7503 3846 7566

$$

KRUZDLO

1 follow-up statement

245 
WWUS51 KPHI 250004
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
804 PM EDT THU JUN 24 2010

DEC005-250013-
/O.CAN.KPHI.SV.W.0085.000000T0000Z-100625T0015Z/
SUSSEX DE-
804 PM EDT THU JUN 24 2010

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SUSSEX COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM THAT PRODUCED THE HAIL AND STRONG WINDS 
HAS MOVED OFF THE COAST. FOR THIS REASON, THE SEVERE THUNDERSTORM 
HAS BEEN CANCELLED.

LAT...LON 3845 7564 3847 7571 3855 7571 3877 7507
      3865 7505 3863 7506 3860 7504 3846 7503
      3844 7505
TIME...MOT...LOC 0003Z 300DEG 29KT 3847 7459 3826 7522

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 2:56 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	64 min
Jun 24, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	61 min
Jun 24, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	57 min
Jun 24, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	87 min
Jun 24, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Kent	59 min
Jun 24, 6:53 PM EDT	Special Weather Statement	PHI	Sussex	67 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2010 Every severe thunderstorm warning in 2010

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.