Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 109, NWS Philadelphia/Mount Holly

June 12, 2011Cecil County, Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 12, 2011, 5:08 PM EDT for Cecil County, Kent County, Queen Anne's County, Maryland. It was in force for 52 min. 4 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 12, 2011, 5:08 PM EDT (21:08 UTC)
Expired: Jun 12, 2011, 6:00 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties 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 21:09 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
Jun 12, 5:45 PM EDT	TSTM WND DMG	2 W Galena, MD	TREE DOWN ACROSS ROAD.
Jun 12, 6:10 PM EDT	TSTM WND DMG	2 Ne Starkey Corner, MD	TREES DOWN IN CHURCH HILL.
Jun 12, 6:10 PM EDT	TSTM WND GST 57	2 Ne Starkey Corner, MD	A 57 MPH THUNDERSTORM WIND GUST WAS MEASURED IN CHURCH HILL.
Jun 12, 6:10 PM EDT	HAIL 0.5	2 Ne Starkey Corner, MD	HAIL AROUND HALF INCH IN DIAMETER REPORTED IN CHURCH HILL.

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
Jun 12, 1:48 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.1 hours before the alert went out and 109 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: 360 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 2 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.

800 
WUUS51 KPHI 122108
SVRPHI
MDC015-029-035-122200-
/O.NEW.KPHI.SV.W.0109.110612T2108Z-110612T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
508 PM EDT SUN JUN 12 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL CECIL COUNTY IN NORTHEAST MARYLAND...
  KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF CENTERVILLE...

* UNTIL 600 PM EDT

* AT 505 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 8 MILES
  NORTHWEST OF BETTERTON...AND MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BETTERTON AROUND 525 PM EDT...
  NEWTOWN AROUND 530 PM EDT...
  KENNEDYVILLE AROUND 545 PM EDT...
  MORGNEC AND CHESTERTOWN AROUND 550 PM EDT...
  LANGFORD AROUND 555 PM EDT...
  CRUMPTON AND CHURCH HILL AROUND 600 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY
EVENING FOR NORTHEASTERN MARYLAND.

&&

LAT...LON 3903 7633 3905 7631 3903 7625 3907 7623
      3916 7628 3932 7619 3938 7611 3938 7607
      3945 7596 3914 7575 3914 7579 3909 7588
      3900 7618 3904 7629 3901 7629 3898 7623
      3894 7636
TIME...MOT...LOC 2107Z 330DEG 18KT 3944 7617

$$

IOVINO

1 follow-up statement

354 
WWUS51 KPHI 122135
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
535 PM EDT SUN JUN 12 2011

MDC015-029-035-122200-
/O.CON.KPHI.SV.W.0109.000000T0000Z-110612T2200Z/
CECIL MD-KENT MD-QUEEN ANNE'S MD-
535 PM EDT SUN JUN 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHERN QUEEN ANNE'S...KENT AND SOUTH CENTRAL CECIL COUNTIES...

AT 532 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR BETTERTON...MOVING SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  KENNEDYVILLE BY 545 PM EDT...
  MORGNEC BY 550 PM EDT...
  KINGSTOWN AND CHESTERTOWN BY 555 PM EDT...
  CRUMPTON AND CHURCH HILL BY 600 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY
EVENING FOR NORTHEASTERN MARYLAND.

&&

LAT...LON 3903 7633 3905 7631 3903 7625 3907 7623
      3916 7628 3932 7619 3938 7611 3938 7607
      3945 7596 3914 7575 3914 7579 3909 7588
      3900 7618 3904 7629 3901 7629 3898 7623
      3894 7636
TIME...MOT...LOC 2134Z 330DEG 18KT 3932 7608

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 9:59 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jun 11, 10:29 PM EDT	Special Weather Statement	PHI	Cecil	61 min
Jun 11, 10:52 PM EDT	Special Weather Statement	PHI	Cecil	68 min
Jun 12, 3:35 PM EDT	Special Weather Statement	PHI	Cecil	55 min
Jun 12, 3:51 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	54 min
Jun 12, 4:55 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	65 min
Jun 12, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	65 min
Jun 12, 6:50 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	55 min

Nearby

Severe Thunderstorm Warnings in Maryland, 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.