Alert archive / Maryland / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 200, NWS Philadelphia/Mount Holly

September 28, 2004New Castle County, Delaware; Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 28, 2004, 2:12 PM EDT for New Castle County, Delaware; Cecil County, Kent County, Maryland. It was in force for 63 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, 2:12 PM EDT (18:12 UTC)
Expired: Sep 28, 2004, 3:15 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties New Castle County, DE, Cecil County, MD, Kent County, MD

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.2 hours before the alert went out and 19 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 281812
SVRPHI
DEC003-MDC015-029-281915-
/X.NEW.KPHI.SV.W.0004.040928T1812Z-040928T1915Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CECIL COUNTY IN NORTHEAST MARYLAND
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND
  WESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE
  THIS INCLUDES THE CITY OF NEWARK

* UNTIL 315 PM EDT

* AT 210 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR MILLINGTON
  IN KENT COUNTY. IT IS MOVING NORTH AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CECILTON BY 225 PM EDT
  MIDDLETOWN BY 235 PM EDT
  ELKTON BY 255 PM EDT
  NEWARK BY 305 PM EDT
  STANTON BY 310 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 3948 7597 3947 7596 3948 7593 3950 7594
      3948 7596 3971 7594 3973 7563 3935 7573
      3929 7577 3925 7577 3927 7586 3924 7599

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 2:36 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	3 hr
Sep 28, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	46 min
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
Sep 28, 6:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent	67 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2004 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.