Alert archive / Maryland / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 61, NWS Philadelphia/Mount Holly

June 29, 2012Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 29, 2012, 11:45 PM EDT for Cecil County, Kent County, Maryland. It was in force for 60 min. 2 reports 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
Jun 29, 2012, 11:45 PM EDT (03:45 UTC)
Expired
Jun 30, 2012, 12:45 AM EDT
In force
60 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Cecil County, MD, Kent County, MD

The radar

The Dover AFB radar (KDOX), 94 km from the middle of the area, began a volume at 03:49 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

TimeReportWhereRemark
Jun 30, 12:06 AM EDTTSTM WND DMGWarwick, MDTREES AND WIRES REPORTED DOWN IN THE WARWICK AREA. ALSO... DAMAGE TO BUILDINGS REPORTED.
Jun 30, 12:15 AM EDTTSTM WND DMGElkton, MD*** 1 INJ *** MUMEROUS TREES AND POWER LINES DOWN COUNTYWIDE. ABOUT THIRTY-FIVE ROAWAYS WITH TREES DOWN ACROSS THEM. CHESAPEAKE CITY MULTIPLE LARGE TREES INTO HOMES WITH ONE INJURY. NORTHEAST TREE INTO ONE HOME. CECILTON A LARGE CONCENTRATION OF DOWNED TREES.

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.

IssuedProductOfficeLasted
Jun 29, 10:09 PM EDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.8 hours before the alert went out and 134 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2012-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5490 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2012-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
5490 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1596 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.9
Supercell composite
12.1

Open this sounding in Storm Lab

The text

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

533 
WUUS51 KPHI 300345
SVRPHI
MDC015-029-300445-
/O.NEW.KPHI.SV.W.0061.120630T0345Z-120630T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1145 PM EDT FRI JUN 29 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...
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND...

* UNTIL 1245 AM EDT

* AT 1140 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 12
  MILES SOUTHWEST OF OCTORARO...OR 23 MILES NORTHEAST OF BALTIMORE...
  AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHARLESTOWN AROUND 1205 AM EDT...
  HOLLYWOOD BEACH AND 6 MILES SOUTH OF NORTH EAST AROUND 1210 AM
  EDT...
  CAYOTS AROUND 1215 AM EDT...
  BRANTWOOD AND 6 MILES SOUTH OF ELKTON AROUND 1220 AM EDT...
  BOHEMIAS MILLS AROUND 1225 AM 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM EDT
SATURDAY MORNING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
SOUTHERN NEW JERSEY.

&&

LAT...LON 3972 7579 3936 7576 3933 7618 3938 7611
      3938 7606 3942 7601 3946 7602 3952 7599
      3954 7607 3956 7610 3958 7608 3963 7616
      3965 7616 3972 7623
TIME...MOT...LOC 0345Z 270DEG 32KT 3952 7621

$$

AMC

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 11:03 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot72 min
Jun 29, 11:22 PM EDTSpecial Weather StatementPHICecil53 min
Jun 30, 12:45 AM EDTSpecial Weather StatementPHICaroline, Cecil, Kent, Queen Anne's, Talbot60 min
Jun 30, 3:48 AM EDTHeat AdvisoryPHICaroline, Cecil, Kent, Queen Anne's, Talbot16 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2012Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.