Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 39, NWS Philadelphia/Mount Holly

June 4, 2008Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 4, 2008, 3:59 PM EDT for Kent County, New Castle County, Sussex County, Delaware. It was in force for 76 min. 5 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 4, 2008, 3:59 PM EDT (19:59 UTC)
Expired: Jun 4, 2008, 5:15 PM EDT
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 20:03 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 4, 4:49 PM EDT	TSTM WND DMG	Cheswold, DE	TREE REPORTED DOWN ON A HOUSE IS CHESWOLD.
Jun 4, 5:00 PM EDT	TSTM WND DMG	Bethany Beach, DE	PUBLIC REPORTED CHIMNEY DAMAGE IN BETHANY BEACH.
Jun 4, 5:00 PM EDT	TSTM WND DMG	Dagsboro, DE	TREES DOWN.
Jun 4, 5:00 PM EDT	TSTM WND DMG	Ocean View, DE	NUMEROUS TREES DOWN IN OCEAN VIEW
Jun 4, 5:06 PM EDT	TSTM WND GST 62	Lewes, DE	62 MPH WIND GUST REPORTED AT LEWES C-MAN STATION.

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 4, 2:53 PM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.0 hours before the alert went out and 68 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: 27 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 221 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.

000 
WUUS51 KPHI 042001
SVRPHI
DEC001-003-005-042115-
/O.NEW.KPHI.SV.W.0039.080604T1959Z-080604T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
359 PM EDT WED JUN 4 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 515 PM EDT

* AT 358 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 34 MILES WEST OF BOHEMIAS
  MILLS TO 26 MILES WEST OF SANDTOWN TO 32 MILES WEST OF SEAFORD...OR
  ALONG A LINE EXTENDING FROM 35 MILES SOUTH OF LANCASTER TO 37 MILES
  WEST OF DOVER TO 57 MILES SOUTHWEST OF DOVER...AND MOVING EAST 
AT   60 TO 70 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SANDTOWN AND HARTLY BY 425 PM...
  ANDREWSVILLE...HAZLETTVILLE...DELANEY CORNER AND BOHEMIAS MILLS BY
  430 PM...
  GLASGOW...BEAR...DOVER DOWNS AND SYCAMORE BY 435 PM...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATIONS WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
THE MARYLAND WESTERN SHORE AND WASHINGTON DC AREA. THIS IS AN 
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM WEDNESDAY EVENING FOR
DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

LAT...LON 3846 7571 3973 7579 3975 7563 3966 7555
      3965 7558 3960 7560 3959 7555 3954 7555
      3947 7559 3924 7539 3908 7539 3903 7533
      3892 7530 3882 7519 3879 7514 3881 7509
      3879 7507 3845 7505
TIME...MOT...LOC 1959Z 270DEG 53KT 3954 7640 3908 7618
          3852 7616

$$

TFG

2 follow-up statements

000 
WWUS51 KPHI 042043
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
443 PM EDT WED JUN 4 2008

DEC001-003-005-042115-
/O.CON.KPHI.SV.W.0039.000000T0000Z-080604T2115Z/
KENT DE-SUSSEX DE-NEW CASTLE DE-
443 PM EDT WED JUN 4 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NEW CASTLE...SUSSEX AND KENT COUNTIES...

AT 435 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY 
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES SOUTHWEST OF GLASGOW
TO HAZLETTVILLE TO GEORGETOWN TO LAUREL...OR ALONG A LINE EXTENDING 
FROM 9 MILES SOUTHWEST OF NEWARK TO 10 MILES SOUTHWEST OF DOVER TO 34
MILES SOUTH OF DOVER TO 44 MILES SOUTH OF DOVER...MOVING EAST AT
60 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  DELAWARE CITY...BEAR...DOVER DOWNS AND GUMBORO BY 445 PM EDT...
  BIG STONE BEACH...WOODLAND BEACH...PORT PENN AND SLAUGHTER BEACH BY
  450 PM EDT...
  REHOBOTH BEACH AND OCEAN VIEW BY 455 PM EDT...

THE STRONGEST PART OF THIS LINE IS ACROSS KENT COUNTY AND ESPECIALLY 
SUSSEX COUNTY...HOWEVER LOCALLY DAMAGING WINDS CAN STILL OCCUR 
ANYWHERE ALONG THIS LINE. IN ADDITION, FREQUENT CLOUD TO GROUND 
LIGHTNING IS OCCURRING WITH THIS LINE OF THUNDERSTORMS. REMAIN INDOORS
UNTIL THIS LINE OF SEVERE THUNDERSTORMS COMPLETELY CLEARS YOUR AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

LAT...LON 3846 7571 3973 7579 3975 7563 3966 7555
      3965 7558 3960 7560 3959 7555 3954 7555
      3947 7559 3924 7539 3908 7539 3903 7533
      3892 7530 3882 7519 3879 7514 3881 7509
      3879 7507 3845 7505
TIME...MOT...LOC 2039Z 270DEG 53KT 3957 7576 3906 7558
          3867 7536 3852 7545

$$

GORSE

000 
WWUS51 KPHI 042113
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
512 PM EDT WED JUN 4 2008

DEC001-003-005-042122-
/O.EXP.KPHI.SV.W.0039.000000T0000Z-080604T2115Z/
KENT DE-SUSSEX DE-NEW CASTLE DE-
512 PM EDT WED JUN 4 2008

...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...SUSSEX AND KENT
COUNTIES WILL EXPIRE AT 515 PM EDT...

MORE THUNDERSTORMS ARE POSSIBLE LATER THIS EVENING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

LAT...LON 3846 7571 3973 7579 3975 7563 3966 7555
      3965 7558 3960 7560 3959 7555 3954 7555
      3947 7559 3924 7539 3908 7539 3903 7533
      3892 7530 3882 7519 3879 7514 3881 7509
      3879 7507 3845 7505
TIME...MOT...LOC 2112Z 270DEG 53KT 3957 7513 3906 7495
          3867 7474 3852 7483

$$

AMC

Nearby

Severe Thunderstorm Warnings in Delaware, 2008 Every severe thunderstorm warning in 2008

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.