Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 126, NWS Philadelphia/Mount Holly

July 6, 2008Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2008, 2:41 PM EDT for Kent County, Sussex County, Delaware. It was in force for 28 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 6, 2008, 2:41 PM EDT (18:41 UTC)
Expired: Jul 6, 2008, 3:09 PM EDT
In force: 28 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), 24 km from the middle of the area, began a volume at 18:43 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 6, 2:45 PM EDT	TSTM WND DMG	Harrington, DE	WIRES WERE KNOCKED DOWN IN THE HARRINGTON 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 12:00Z, 6.7 hours before the alert went out and 123 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: 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 061841
SVRPHI
DEC001-005-061945-
/O.NEW.KPHI.SV.W.0126.080706T1841Z-080706T1945Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 345 PM EDT

* AT 238 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 MILFORD...OR ABOUT 15 MILES
  SOUTH OF DOVER...AND MOVING NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BOWERS BY 255 PM...
  BIG STONE BEACH BY 300 PM...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION 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.

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 3883 7553 3896 7563 3922 7539 3920 7538
      3917 7540 3913 7540 3911 7539 3908 7539
      3903 7533 3898 7529 3894 7530
TIME...MOT...LOC 1841Z 232DEG 22KT 3896 7545

$$
 
TFG

1 follow-up statement

000 
WWUS51 KPHI 061909
SVSPHI

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

DEC001-005-061918-
/O.CAN.KPHI.SV.W.0126.000000T0000Z-080706T1945Z/
KENT DE-SUSSEX DE-
308 PM EDT SUN JUL 6 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SUSSEX AND
SOUTHEASTERN KENT COUNTIES IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING TO BE ISSUED HAS WEAKENED.
THE SEVERE THUNDERSTORM WARNING IS CANCELLED.

LAT...LON 3883 7553 3896 7563 3922 7539 3920 7538
      3917 7540 3913 7540 3911 7539 3908 7539
      3903 7533 3898 7529 3894 7530
TIME...MOT...LOC 1908Z 232DEG 22KT 3906 7528

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 1:45 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	90 min
Jul 6, 1:46 PM EDT	Flash Flood Warning	PHI	Sussex	5 hr
Jul 6, 2:55 PM EDT	Flash Flood Warning	PHI	Kent, Sussex	2 hr

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.