Alert archive / Delaware / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 72, NWS Philadelphia/Mount Holly

June 22, 2010Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2010, 10:49 PM EDT for Sussex County, Delaware. It was in force for 41 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 22, 2010, 10:49 PM EDT (02:49 UTC)
Expired: Jun 22, 2010, 11:30 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 22 km from the middle of the area, began a volume at 02:52 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 22, 10:55 PM EDT	TSTM WND DMG	Lewes, DE	MANY ELECTRICAL WIRES DOWN NEAR LEWES.
Jun 22, 10:56 PM EDT	TSTM WND DMG	Millsboro, DE	TREE DOWN IN THE MILLSBORO AREA.

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 00:00Z, 2.8 hours before the alert went out and 91 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: 796 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 1216 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

779 
WUUS51 KPHI 230249
SVRPHI
DEC005-230330-
/O.NEW.KPHI.SV.W.0072.100623T0249Z-100623T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1049 PM EDT TUE JUN 22 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1130 PM EDT

* AT 1047 PM 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 ALONG A LINE EXTENDING
  FROM 7 MILES NORTHEAST OF SLAUGHTER BEACH TO MILLSBORO...OR ALONG A
  LINE EXTENDING FROM 17 MILES WEST OF CAPE MAY TO 7 MILES SOUTH OF
  GEORGETOWN...AND MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MILLSBORO AND DAGSBORO AROUND 1055 PM EDT...
  SELBYVILLE AND LEWES AROUND 1100 PM EDT...
  REHOBOTH BEACH AND MILLVILLE AROUND 1105 PM EDT...
  FENWICK ISLAND AND BETHANY BEACH AROUND 1110 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3845 7542 3892 7542 3895 7539 3895 7533
      3894 7530 3893 7530 3881 7518 3879 7513
      3880 7508 3867 7506 3867 7505 3863 7506
      3860 7504 3846 7503
TIME...MOT...LOC 0249Z 273DEG 33KT 3898 7518 3859 7533

$$

MPD

1 follow-up statement

193 
WWUS51 KPHI 230322
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1122 PM EDT TUE JUN 22 2010

DEC005-230332-
/O.EXP.KPHI.SV.W.0072.000000T0000Z-100623T0330Z/
SUSSEX DE-
1122 PM EDT TUE JUN 22 2010

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SUSSEX COUNTY WILL
EXPIRE AT 1130 PM EDT...

THE STORM THAT MOVED ACROSS EASTERN SUSSEX COUNTY HAS MOVED OUT TO 
SEA. 

LAT...LON 3845 7542 3892 7542 3895 7539 3895 7533
      3894 7530 3893 7530 3881 7518 3879 7513
      3880 7508 3867 7506 3867 7505 3863 7506
      3860 7504 3846 7503
TIME...MOT...LOC 0322Z 273DEG 33KT 3896 7479 3857 7494

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 8:00 PM EDT	Severe Thunderstorm Warning	PHI	Kent	30 min
Jun 22, 8:14 PM EDT	Special Weather Statement	PHI	Kent, New Castle	61 min
Jun 22, 8:29 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	46 min
Jun 22, 9:33 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	27 min
Jun 22, 9:46 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	59 min
Jun 22, 10:36 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jun 22, 11:51 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jun 23, 12:58 AM EDT	Special Weather Statement	PHI	Sussex	92 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.