Alert archive / Delaware / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 139, NWS Philadelphia/Mount Holly

July 16, 2007New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 16, 2007, 7:39 PM EDT for New Castle County, Delaware. It was in force for 32 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 16, 2007, 7:39 PM EDT (23:39 UTC)
Expired: Jul 16, 2007, 8:11 PM EDT
In force: 32 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 66 km from the middle of the area, began a volume at 23:42 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 16, 7:55 PM EDT	HAIL 0.25	5 S Townsend, DE	PEA SIZE HAIL REPORTED IN PRICES CORNER AREA.

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
Jul 16, 1:58 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.7 hours before the alert went out and 38 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: 195 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 1354 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 162339
SVRPHI
DEC003-170030-
/O.NEW.KPHI.SV.W.0139.070716T2339Z-070717T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
739 PM EDT MON JUL 16 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 830 PM EDT

* AT 738 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 
  SOUTH OF MIDDLETOWN...AND MOVING SOUTHEAST AT 20 MPH.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR THE WARNED AREA.

LAT...LON 3946 7577 3931 7577 3930 7563 3936 7553
      3946 7558

$$

IOVINO

1 follow-up statement

000 
WWUS51 KPHI 170011
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
810 PM EDT MON JUL 16 2007

DEC003-170020-
/O.CAN.KPHI.SV.W.0139.000000T0000Z-070717T0030Z/
NEW CASTLE DE-
810 PM EDT MON JUL 16 2007

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN NEW CASTLE COUNTY IS
CANCELLED...

AT 810 PM EDT...THE THUNDERSTORM OVER SOUTHERN NEW CASTLE COUNTY WAS 
CONTINUING TO WEAKEN. AS A RESULT...THE SEVERE THUNDERSTORM WARNING 
HAS BEEN CANCELLED.

LAT...LON 3946 7577 3931 7577 3930 7563 3936 7553
      3946 7558

$$

IOVINO

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; radar from the NEXRAD Level II archive.