Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 125, NWS Philadelphia/Mount Holly

July 6, 2008Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2008, 1:45 PM EDT for Sussex County, Delaware. It was in force for 90 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 6, 2008, 1:45 PM EDT (17:45 UTC)
Expired
Jul 6, 2008, 3:15 PM EDT
In force
90 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 17:48 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.8 hours before the alert went out and 89 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2008-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 957 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2008-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
957 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
479 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
46 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.

000 
WUUS51 KPHI 061745
SVRPHI
DEC005-061915-
/O.NEW.KPHI.SV.W.0125.080706T1745Z-080706T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
145 PM EDT SUN JUL 6 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 315 PM EDT

* AT 142 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 MILLSBORO...OR ABOUT 6
  MILES SOUTH OF GEORGETOWN...AND MOVING NORTH AT 7 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILLSBORO BY 150 PM...
  GEORGETOWN BY 240 PM...
  MILTON BY 315 PM...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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.

LAT...LON 3856 7550 3894 7537 3888 7524 3882 7519
      3880 7515 3879 7511 3881 7509 3880 7507
      3867 7506 3865 7508 3868 7509 3868 7512
      3863 7510 3848 7529
TIME...MOT...LOC 1745Z 198DEG 6KT 3860 7539

$$
 
TFG
1 follow-up statement
000 
WWUS51 KPHI 061814
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
212 PM EDT SUN JUL 6 2008

DEC005-061915-
/O.CON.KPHI.SV.W.0125.000000T0000Z-080706T1915Z/
SUSSEX DE-
212 PM EDT SUN JUL 6 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR EASTERN SUSSEX COUNTY...

AT 208 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS TO
60 MPH.  THIS STORM WAS LOCATED NEAR GEORGETOWN...MOVING NORTHEAST  
AT 15 MPH. DOVER DOPPLER RADAR WAS INDICATING VERY STRONG WINDS WITH 
THIS STORM JUST ABOVE THE GROUND AND JUST NORTH OF THE GEORGETOWN OR
SUSSEX COUNTY AIRPORT.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILTON BY 240 PM EDT...
  8 MILES WEST OF LEWES BY 255 PM EDT...

IN ADDITION TO THE 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. A FLASH FLOOD WARNING IS ALSO IN EFFECT.

LAT...LON 3856 7550 3894 7537 3888 7524 3882 7519
      3880 7515 3879 7511 3881 7509 3880 7507
      3867 7506 3865 7508 3868 7509 3868 7512
      3863 7510 3848 7529
TIME...MOT...LOC 1812Z 197DEG 9KT 3871 7534

$$
 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 1:46 PM EDTFlash Flood WarningPHISussex5 hr
Jul 6, 2:41 PM EDTSevere Thunderstorm WarningPHIKent, Sussex28 min
Jul 6, 2:55 PM EDTFlash Flood WarningPHIKent, Sussex2 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2008Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.