Alert archive / Maryland / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 66, NWS Philadelphia/Mount Holly

June 11, 2009Kent County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 11, 2009, 5:58 PM EDT for Kent County, Queen Anne's County, Talbot County, Maryland. It was in force for 47 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
Jun 11, 2009, 5:58 PM EDT (21:58 UTC)
Expired
Jun 11, 2009, 6:45 PM EDT
In force
47 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 71 km from the middle of the area, began a volume at 22:00 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 nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.0 hours before the alert went out and 58 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, Phillips Aaf/Abe, MD at 12:00Z on 2009-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2009-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
729 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 112158
SVRPHI
MDC029-035-041-112245-
/O.NEW.KPHI.SV.W.0066.090611T2158Z-090611T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
558 PM EDT THU JUN 11 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN TALBOT COUNTY IN EASTERN MARYLAND...
  SOUTHWESTERN KENT COUNTY IN NORTHEAST MARYLAND...
  SOUTHWESTERN QUEEN ANNES COUNTY IN NORTHEAST MARYLAND...

* UNTIL 645 PM EDT

* AT 556 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED 9 MILES NORTHWEST OF TALBOT...OR 21 MILES WEST OF
  EASTON...AND MOVING NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  7 MILES NORTHWEST OF TALBOT AROUND 610 PM EDT...
  CHESTER AND STEVENSVILLE AROUND 620 PM EDT...
  GRASONVILLE AROUND 630 PM EDT...
  OVERTON AROUND 635 PM EDT...
  WYE MILLS AND 8 MILES NORTHWEST OF SKIPTON AROUND 640 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.

&&

LAT...LON 3905 7631 3899 7624 3901 7617 3907 7618
      3901 7619 3903 7625 3911 7625 3915 7618
      3907 7619 3908 7615 3882 7602 3879 7632
      3880 7633 3887 7626 3882 7621 3883 7620
      3894 7624 3884 7638 3885 7639
TIME...MOT...LOC 2158Z 245DEG 21KT 3888 7642

$$

PO
1 follow-up statement
000 
WWUS51 KPHI 112224
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
624 PM EDT THU JUN 11 2009

MDC029-035-041-112245-
/O.CON.KPHI.SV.W.0066.000000T0000Z-090611T2245Z/
KENT MD-QUEEN ANNES MD-TALBOT MD-
624 PM EDT THU JUN 11 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTH CENTRAL TALBOT...SOUTHWESTERN QUEEN ANNES AND EXTREME
SOUTHWESTERN KENT COUNTIES...

AT 623 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.
THIS STORM WAS LOCATED NEAR STEVENSVILLE SOUTH...OR 16 MILES 
NORTHWEST OF EASTON...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES SOUTH OF STEVENSVILLE BY 630 PM EDT...
  CHESTER BY 635 PM EDT...
  GRASONVILLE...QUEENSTOWN AND 7 MILES SOUTH OF OVERTON BY 645 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.

&&

LAT...LON 3900 7634 3901 7629 3898 7621 3903 7617
      3904 7618 3901 7619 3902 7623 3903 7623
      3906 7614 3886 7605 3883 7620 3886 7624
      3889 7621 3894 7624 3893 7628 3890 7629
      3891 7632 3888 7632 3884 7638
TIME...MOT...LOC 2224Z 253DEG 12KT 3891 7631

$$

PO

Nearby

Severe Thunderstorm Warnings in Maryland, 2009Every severe thunderstorm warning in 2009

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.