Alert archive / Delaware / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 196, NWS Philadelphia/Mount Holly

August 17, 2007New Castle County, Delaware; Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2007, 2:36 PM EDT for New Castle County, Delaware; Delaware County, Pennsylvania. It was in force for 54 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: Aug 17, 2007, 2:36 PM EDT (18:36 UTC)
Expired: Aug 17, 2007, 3:30 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties New Castle County, DE, Delaware County, PA

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 17, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.6 hours before the alert went out and 189 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: 352 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1022 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 171836
SVRPHI
DEC003-PAC045-171930-
/O.NEW.KPHI.SV.W.0196.070817T1836Z-070817T1930Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF SPRINGFIELD...

* UNTIL 330 PM EDT

* AT 234 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 NEAR
  ELAM...OR ABOUT 9 MILES NORTH OF WILMINGTON...AND MOVING SOUTHEAST
  AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  7 MILES SOUTHWEST OF LIMA BY 240 PM EDT...
  BELLEFONTE AND 8 MILES SOUTHWEST OF NETHER PROVIDENCE TOWNSHIP BY
  245 PM EDT...
  CHESTER AND 9 MILES SOUTHWEST OF SWARTHMORE BY 250 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

LAT...LON 3984 7565 3984 7559 3987 7561 3989 7558
      3992 7556 3992 7553 3994 7552 3998 7547
      3993 7529 3978 7543 3976 7547 3974 7548
      3981 7570
TIME...MOT...LOC 1836Z 298DEG 34KT 3985 7556

$$

JJM

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, 12:26 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	22 min
Aug 17, 1:48 PM EDT	Severe Thunderstorm Warning	PHI	Chester	72 min
Aug 17, 2:07 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	68 min
Aug 17, 2:14 PM EDT	Tornado Warning	PHI	Chester	46 min
Aug 17, 2:19 PM EDT	Tornado Warning	PHI	Carbon	26 min
Aug 17, 2:20 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	70 min
Aug 17, 2:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	79 min
Aug 17, 2:43 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	62 min
Aug 17, 2:45 PM EDT	Tornado Warning	PHI	Carbon, Northampton	45 min
Aug 17, 2:54 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	66 min
Aug 17, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	19 min
Aug 17, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	60 min
Aug 17, 4:51 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	43 min
Aug 17, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	58 min
Aug 17, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	19 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2007 Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive.