Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 168, NWS Philadelphia/Mount Holly

July 8, 2011Caroline County, Queen Anne's County, Talbot County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2011, 5:53 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland; Kent County, Delaware. It was in force for 82 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: Jul 8, 2011, 5:53 PM EDT (21:53 UTC)
Expired: Jul 8, 2011, 7:15 PM EDT
In force: 82 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 57 km from the middle of the area, began a volume at 21:56 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
Jul 8, 1:51 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.9 hours before the alert went out and 46 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: 1352 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

702 
WUUS51 KPHI 082153
SVRPHI
DEC001-MDC011-035-041-082315-
/O.NEW.KPHI.SV.W.0168.110708T2153Z-110708T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
553 PM EDT FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF DOVER...
  NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  NORTHERN TALBOT COUNTY IN EASTERN MARYLAND...
  QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF CENTERVILLE...

* UNTIL 715 PM EDT

* AT 551 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR HOPE...OR 6 MILES NORTHEAST OF
  CENTERVILLE...AND MOVING NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SUDLERSVILLE AROUND 600 PM EDT...
  HARTLY AROUND 610 PM EDT...
  HAZLETTVILLE AROUND 615 PM EDT...
  CHESWOLD AND 6 MILES SOUTHEAST OF CLAYTON AROUND 620 PM EDT...
  DOVER SPEEDWAY...DOVER AND SMYRNA AROUND 625 PM EDT...
  WOODLAND BEACH AROUND 635 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

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 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 3904 7631 3900 7627 3899 7620 3906 7619
      3918 7604 3926 7584 3925 7577 3929 7576
      3931 7559 3937 7551 3932 7546 3896 7534
      3884 7629 3887 7621 3894 7624 3890 7624
      3893 7628 3884 7638 3885 7639
TIME...MOT...LOC 2153Z 245DEG 38KT 3909 7593

$$

NIERENBERG

1 follow-up statement

546 
WWUS51 KPHI 082304
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
704 PM EDT FRI JUL 8 2011

MDC035-082314-
/O.CAN.KPHI.SV.W.0168.000000T0000Z-110708T2315Z/
QUEEN ANNE'S MD-
704 PM EDT FRI JUL 8 2011

...THE SEVERE THUNDERSTORM WARNING FOR QUEEN ANNE'S COUNTY IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

LAT...LON 3897 7595 3903 7589 3908 7586 3914 7577
      3914 7576 3918 7571 3919 7573 3923 7571
      3937 7551 3932 7546 3907 7539 3896 7534
      3890 7595
TIME...MOT...LOC 2304Z 245DEG 38KT 3941 7505

$$

DEC001-MDC011-041-082315-
/O.CON.KPHI.SV.W.0168.000000T0000Z-110708T2315Z/
KENT DE-CAROLINE MD-TALBOT MD-
704 PM EDT FRI JUL 8 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR EXTREME NORTHEASTERN TALBOT...NORTHERN CAROLINE AND KENT
COUNTIES...

AT 700 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED 24 MILES NORTHEAST OF LITTLE CREEK...OR
NEAR MILLVILLE...MOVING NORTHEAST AT 45 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 3897 7595 3903 7589 3908 7586 3914 7577
      3914 7576 3918 7571 3919 7573 3923 7571
      3937 7551 3932 7546 3907 7539 3896 7534
      3890 7595
TIME...MOT...LOC 2304Z 245DEG 38KT 3941 7505

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 3:58 AM EDT	Flash Flood Watch	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	19 hr
Jul 8, 2:12 PM EDT	Special Weather Statement	PHI	Cecil	93 min
Jul 8, 4:17 PM EDT	Special Weather Statement	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	88 min
Jul 8, 4:29 PM EDT	Areal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	4 hr
Jul 8, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	82 min
Jul 8, 2:25 PM EDT	Areal Flood Advisory	PHI	New Castle	7 hr
Jul 8, 5:44 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 8, 6:02 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	4 hr
Jul 8, 7:46 PM EDT	Special Weather Statement	PHI	Sussex	59 min
Jul 8, 7:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	56 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.