Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 6, NWS Philadelphia/Mount Holly

February 25, 2011Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2011, 1:55 PM EST for Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. It was in force for 65 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: Feb 25, 2011, 1:55 PM EST (18:55 UTC)
Expired: Feb 25, 2011, 3:00 PM EST
In force: 65 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 70 km from the middle of the area, began a volume at 18:55 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
Feb 25, 3:00 PM EST	NON-TSTM WND GST 61	Tolchester Beach, MD

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
Feb 25, 12:19 PM EST	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.9 hours before the alert went out and 133 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 482 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 557 m²/s²
0-3 km storm-relative helicity: 622 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

238 
WUUS51 KPHI 251855
SVRPHI
DEC001-003-MDC015-029-035-252000-
/O.NEW.KPHI.SV.W.0006.110225T1855Z-110225T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
155 PM EST FRI FEB 25 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN KENT COUNTY IN CENTRAL DELAWARE...
  SOUTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  SOUTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF MIDDLETOWN...

* UNTIL 300 PM EST

* AT 151 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 10 MILES WEST OF LANGFORD...OR
  17 MILES EAST OF BALTIMORE...AND MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEWTOWN AND LANGFORD AROUND 200 PM EST...
  MORGNEC AND CHESTERTOWN AROUND 205 PM EST...
  KENNEDYVILLE AND CRUMPTON AROUND 210 PM EST...
  MASSEY AND MILLINGTON AROUND 215 PM EST...
  DELANEY CORNER AND SASSAFRAS AROUND 220 PM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...AND DEADLY CLOUD TO GROUND 
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY 
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 3927 7622 3930 7619 3932 7619 3934 7617
      3935 7614 3938 7611 3938 7607 3941 7605
      3947 7558 3938 7550 3937 7550 3924 7538
      3923 7539 3916 7628
TIME...MOT...LOC 1855Z 260DEG 53KT 3925 7624

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 25, 3:59 AM EST	Coastal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	10 hr
Feb 25, 12:44 PM EST	Special Weather Statement	PHI	Cecil	61 min
Feb 25, 1:36 PM EST	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	54 min
Feb 25, 2:19 PM EST	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	56 min
Feb 25, 7:53 AM EST	Special Weather Statement	PHI	Kent, Sussex	82 min
Feb 25, 9:15 AM EST	Special Weather Statement	PHI	Kent, Sussex	90 min
Feb 25, 10:28 AM EST	Special Weather Statement	PHI	Sussex	62 min
Feb 25, 1:11 PM EST	Severe Thunderstorm Warning	PHI	New Castle	64 min
Feb 25, 2:57 PM EST	Special Weather Statement	PHI	Kent	63 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2011 Severe Thunderstorm Warnings in Delaware, 2011 Every severe thunderstorm warning in 2011

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.