Alert archive / Delaware / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 192, NWS Philadelphia/Mount Holly

August 17, 2007Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2007, 12:26 AM EDT for Sussex County, Delaware. It was in force for 22 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: Aug 17, 2007, 12:26 AM EDT (04:26 UTC)
Expired: Aug 17, 2007, 12:48 AM EDT
In force: 22 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Sussex County, DE

What was reported inside it

Time	Report	Where	Remark
Aug 17, 12:30 AM EDT	HAIL 0.5	Rehoboth Beach, DE	HALF INCH HAIL WAS REPORTED IN REHOBOTH BEACH.

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
Aug 16, 11:07 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.4 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-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: 4766 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 852 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 26.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 170426
SVRPHI
DEC005-170500-
/O.NEW.KPHI.SV.W.0192.070817T0426Z-070817T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1226 AM EDT FRI AUG 17 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 100 AM EDT

* AT 1225 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  REHOBOTH BEACH...OR ABOUT 36 MILES SOUTHEAST OF DOVER...AND MOVING
  EAST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DEWEY
  BEACH

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 AM EDT FRIDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND.

LAT...LON 3867 7518 3877 7520 3879 7509 3868 7507
      3868 7509 3868 7510 3868 7512
TIME...MOT...LOC 0426Z 268DEG 22KT 3873 7509

$$

JRP

1 follow-up statement

000 
WWUS51 KPHI 170448
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1247 AM EDT FRI AUG 17 2007

DEC005-170457-
/O.CAN.KPHI.SV.W.0192.000000T0000Z-070817T0500Z/
SUSSEX DE-
1247 AM EDT FRI AUG 17 2007

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUSSEX COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS MOVED JUST TO THE EAST OF REHOBOTH BEACH AND 
OVER THE NEARSHORE WATERS. 1/2 INCH HAIL WAS REPORTED WITH THIS 
STORM IN REHOBOTH BEACH.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 AM EDT FRIDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND.

LAT...LON 3867 7518 3877 7520 3879 7509 3868 7507
      3868 7509 3868 7510 3868 7512
TIME...MOT...LOC 0447Z 268DEG 22KT 3873 7493

$$

JRP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 10:16 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	44 min
Aug 16, 10:20 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	55 min
Aug 16, 10:54 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	36 min
Aug 16, 11:31 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	25 min
Aug 17, 2:36 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	54 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2007 Every severe thunderstorm warning in 2007

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.