Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 124, NWS Philadelphia/Mount Holly

July 4, 2008Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 4, 2008, 8:58 PM EDT for Kent County, Sussex County, Delaware. It was in force for 77 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: Jul 4, 2008, 8:58 PM EDT (00:58 UTC)
Expired: Jul 4, 2008, 10:15 PM EDT
In force: 77 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 17 km from the middle of the area, began a volume at 00:59 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
Jul 4, 9:00 PM EDT	TSTM WND DMG	Gumboro, DE	FEW TREES AND LINES KNOCKED DOWN FROM THE GUMBORO AND DELMAR AREA EASTWARD THROUGH MILVILLE. ALSO A FEW FIRES FROM LIGHTNING STRIKES. DELMARVA POWER WEB SITE REPORTED AT LEAST 1,300 CUSTOMERS WITHOUT POWER IN THE COUNTY.

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, 1.0 hours before the alert went out and 92 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: 2695 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1099 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 050058
SVRPHI
DEC001-005-050215-
/O.NEW.KPHI.SV.W.0124.080705T0058Z-080705T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
858 PM EDT FRI JUL 4 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1015 PM EDT

* AT 854 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR BRIDGEVILLE...OR ABOUT 13
  MILES WEST OF GEORGETOWN...AND MOVING NORTHEAST AT 27 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ELLENDALE AND 7 MILES NORTHWEST OF GEORGETOWN BY 920 PM...
  MILTON AND 8 MILES SOUTHEAST OF MILFORD BY 930 PM...
  SLAUGHTER BEACH BY 940 PM...
  7 MILES NORTHWEST OF LEWES BY 950 PM...

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

IN ADDITION TO HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND 
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY 
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU 
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

LAT...LON 3846 7564 3891 7573 3900 7531 3898 7529
      3892 7530 3889 7525 3882 7519 3879 7514
      3879 7511 3881 7509 3879 7507 3846 7503
      3845 7505
TIME...MOT...LOC 0058Z 244DEG 24KT 3873 7560

$$
 
TFG

1 follow-up statement

000 
WWUS51 KPHI 050139
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
939 PM EDT FRI JUL 4 2008

DEC001-005-050215-
/O.CON.KPHI.SV.W.0124.000000T0000Z-080705T0215Z/
KENT DE-SUSSEX DE-
939 PM EDT FRI JUL 4 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR SUSSEX AND SOUTHEASTERN KENT COUNTIES...

AT 936 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE 
HAIL...AND DAMAGING WINDS TO 60 MPH.  THIS STORM WAS LOCATED NEAR 
ELLENDALE...OR 8 MILES NORTH OF GEORGETOWN...MOVING NORTHEAST AT 25 
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILTON BY 945 PM EDT...
  SLAUGHTER BEACH BY 1000 PM EDT...
  8 MILES NORTHWEST OF LEWES BY 1010 PM EDT...

ANOTHER POSSIBLY SEVERE STORM WAS APPROACHING LEWES. IN ADDITION TO 
HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS 
OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS 
ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR 
THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS COVERING THE ROAD.

LAT...LON 3845 7526 3873 7539 3865 7556 3889 7571
      3900 7531 3898 7529 3892 7530 3889 7525
      3882 7519 3879 7514 3879 7511 3881 7509
      3879 7507 3846 7503
TIME...MOT...LOC 0139Z 244DEG 20KT 3881 7540

$$

TFG

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.