Alert archive / Maryland / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 165, NWS Philadelphia/Mount Holly

August 5, 2012Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 5, 2012, 4:54 PM EDT for Cecil County, Maryland. It was in force for 51 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 5, 2012, 4:54 PM EDT (20:54 UTC)
Expired: Aug 5, 2012, 5:45 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 95 km from the middle of the area, began a volume at 20:54 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
Aug 5, 3:36 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 hours before the alert went out and 137 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: 809 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 57 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.

455 
WUUS51 KPHI 052054
SVRPHI
MDC015-052145-
/O.NEW.KPHI.SV.W.0165.120805T2054Z-120805T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
454 PM EDT SUN AUG 5 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...

* UNTIL 545 PM EDT

* AT 450 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 15 MILES NORTHWEST OF ROCK
  SPRINGS TO 12 MILES WEST OF CONOWINGO TO 25 MILES SOUTHWEST OF
  OCTORARO...OR ALONG A LINE EXTENDING FROM 13 MILES SOUTH OF
  LANCASTER TO 27 MILES SOUTH OF LANCASTER TO 14 MILES NORTH OF
  BALTIMORE...AND MOVING EAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ROCK SPRINGS AND CONOWINGO AROUND 515 PM EDT...
  RICHARDSMERE AND OCTORARO AROUND 520 PM EDT...
  WEST NOTTINGHAM AND RISING SUN AROUND 530 PM EDT...
  FARMINGTON...CALVERT AND WOODLAWN AROUND 535 PM EDT...
  ZION AROUND 540 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3972 7579 3942 7577 3939 7578 3939 7605
      3943 7600 3945 7603 3947 7601 3952 7599
      3954 7607 3958 7608 3963 7616 3965 7616
      3969 7621 3972 7622
TIME...MOT...LOC 2052Z 261DEG 25KT 3986 7635 3966 7637
          3950 7656

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 4:40 PM EDT	Special Weather Statement	PHI	Cecil	95 min
Aug 5, 5:10 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	80 min
Aug 5, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	82 min
Aug 5, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	39 min
Aug 5, 7:52 PM EDT	Special Weather Statement	PHI	Queen Anne's	68 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2012 Every severe thunderstorm warning in 2012

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.