Alert archive / Maryland / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 269, NWS Philadelphia/Mount Holly

November 15, 2008Cecil County, Kent County, Maryland; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 15, 2008, 4:15 PM EST for Cecil County, Kent County, Maryland; New Castle County, Delaware. It was in force for 30 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: Nov 15, 2008, 4:15 PM EST (21:15 UTC)
Expired: Nov 15, 2008, 4:45 PM EST
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 73 km from the middle of the area, began a volume at 21:18 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Nov 15, 12:22 PM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.3 hours before the alert went out and 146 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: 13 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 443 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 330 m²/s²
0-3 km storm-relative helicity: 430 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 152115
SVRPHI
DEC003-MDC015-029-152145-
/O.NEW.KPHI.SV.W.0269.081115T2115Z-081115T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
415 PM EST SAT NOV 15 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND...
  SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...

* UNTIL 445 PM EST

* AT 414 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR CAYOTS...OR ABOUT 9 MILES
  WEST OF MIDDLETOWN...AND MOVING NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CAYOTS...BOHEMIAS MILLS AND 7 MILES NORTHWEST OF MIDDLETOWN BY 420
  PM...
  BRANTWOOD...MOUNT PLEASANT AND ELKTON BY 425 PM...
  GLASGOW...7 MILES SOUTHEAST OF BARKSDALE AND 9 MILES SOUTHEAST OF
  APPLETON BY 430 PM...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM SATURDAY EVENING FOR
DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY AND
SOUTHEASTERN PENNSYLVANIA. A TORNADO WATCH ALSO REMAINS IN EFFECT
UNTIL 900 PM SATURDAY EVENING FOR NORTHWESTERN NEW JERSEY AND
NORTHEASTERN PENNSYLVANIA.

LAT...LON 3970 7581 3936 7554 3926 7597 3938 7601
      3938 7600 3938 7601 3942 7603
TIME...MOT...LOC 2115Z 225DEG 41KT 3947 7588

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 15, 4:18 PM EST	Severe Thunderstorm Warning	PHI	Queen Anne's	27 min
Nov 15, 5:38 PM EST	Severe Thunderstorm Warning	PHI	Kent, Sussex	67 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2008 Severe Thunderstorm Warnings in Delaware, 2008 Every severe thunderstorm warning in 2008

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; radar from the NEXRAD Level II archive.