Alert archive / Delaware / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 201, NWS Philadelphia/Mount Holly

September 28, 2004New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 28, 2004, 3:14 PM EDT for New Castle County, Delaware. It was in force for 46 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: Sep 28, 2004, 3:14 PM EDT (19:14 UTC)
Expired: Sep 28, 2004, 4:00 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County New Castle County, DE

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 28, 2:25 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.2 hours before the alert went out and 42 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: 95 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 172 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 281915
SVRPHI
DEC003-282000-
/X.NEW.KPHI.SV.W.0005.040928T1914Z-040928T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
314 PM EDT TUE SEP 28 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* SEVERE THUNDERSTORM WARNING FOR...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE
  THIS INCLUDES THE CITY OF WILMINGTON

* UNTIL 400 PM EDT

* AT 312 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR DELAWARE CITY...
  OR ABOUT 10 MILES SOUTHEAST OF NEWARK...AND MOVING NORTH AT 25 MPH.
  TORRENTIAL DOWNPOURS ARE ALSO OCCURRING. TREES COULD BE KNOCKED
  DOWN FROM THE HEAVY RAIN ALONE.


* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEW CASTLE BY 330 PM EDT
  WILMINGTON MANOR BY 335 PM EDT
  NEWPORT...STANTON AND ELSMERE BY 340 PM EDT
  WILMINGTON BY 345 PM EDT

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.

LAT...LON 3955 7569 3955 7568 3956 7559 3977 7549
      3974 7573

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 2:12 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	63 min
Sep 28, 2:36 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	3 hr
Sep 28, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	44 min
Sep 28, 4:11 PM EDT	Tornado Warning	PHI	New Castle	34 min
Sep 28, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	79 min
Sep 28, 5:30 PM EDT	Flash Flood Warning	PHI	Kent, New Castle, Sussex	3 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2004 Every severe thunderstorm warning in 2004

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.