Alert archive / Maryland / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 71, NWS Philadelphia/Mount Holly

June 22, 2010Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2010, 9:46 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 59 min. 3 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 22, 2010, 9:46 PM EDT (01:46 UTC)
Expired: Jun 22, 2010, 10:45 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 27 km from the middle of the area, began a volume at 01:49 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

Time	Report	Where	Remark
Jun 22, 9:50 PM EDT	TSTM WND DMG	Easton, MD	POWER LINE DOWN IN EASTON
Jun 22, 10:10 PM EDT	TSTM WND DMG	1 Nne Smithville, DE	TREES SCATTERED AROUND THE COUNTY
Jun 22, 10:55 PM EDT	TSTM WND DMG	Lewes, DE	MANY ELECTRICAL WIRES DOWN NEAR LEWES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 1.8 hours before the alert went out and 89 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: 796 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 1216 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

966 
WUUS51 KPHI 230146
SVRPHI
DEC001-005-MDC011-035-041-230245-
/O.NEW.KPHI.SV.W.0071.100623T0146Z-100623T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
946 PM EDT TUE JUN 22 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
  CAROLINE COUNTY IN EASTERN MARYLAND...
  EASTERN TALBOT COUNTY IN EASTERN MARYLAND...
  THIS INCLUDES THE CITY OF EASTON...
  SOUTH CENTRAL QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...
  THIS INCLUDES THE CITY OF GEORGETOWN...

* UNTIL 1045 PM EDT

* AT 943 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM SKIPTON TO PRESTON TO 17 MILES SOUTHWEST OF WINDYHILL...OR
  ALONG A LINE EXTENDING FROM 8 MILES NORTH OF EASTON TO 10 MILES
  SOUTHEAST OF EASTON TO 22 MILES SOUTH OF EASTON...AND MOVING EAST
  AT 45 MPH.

A BOWING LINE SEGMENT OF THUNDERSTORMS IN EASTERN MARYLAND HAS 
POCKETS OF 60 MPH WINDS INDICATED BY DOPPLER RADAR NEAR 2000 FEET. 
SOME OF THESE WILL BURST DOWN TO THE GROUND AS THE LINE RACES EAST. 


* SEVERE THUNDERSTORMS WILL BE NEAR...
  SKIPTON...MATTHEWS AND HARMONY AROUND 950 PM EDT...
  CORDOVA...QUEEN ANNE...GRIFFIN AND AGNER AROUND 955 PM EDT...
  DENTON AND SMITHVILLE AROUND 1005 PM EDT...
  SEAFORD AROUND 1010 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.

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

&&

LAT...LON 3846 7570 3865 7572 3869 7583 3867 7595
      3860 7598 3856 7605 3862 7608 3870 7602
      3887 7622 3893 7621 3894 7624 3894 7530
      3881 7518 3879 7513 3880 7507 3854 7504
      3844 7512
TIME...MOT...LOC 0145Z 270DEG 38KT 3888 7610 3870 7589
          3845 7608

$$


DRAG

3 follow-up statements

271 
WWUS51 KPHI 230206
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1006 PM EDT TUE JUN 22 2010

MDC035-230212-
/O.CAN.KPHI.SV.W.0071.000000T0000Z-100623T0245Z/
QUEEN ANNE'S MD-
1006 PM EDT TUE JUN 22 2010

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

LAT...LON 3846 7570 3865 7572 3869 7583 3870 7591
      3871 7596 3875 7598 3874 7603 3877 7605
      3885 7595 3894 7590 3894 7624 3894 7530
      3881 7518 3879 7513 3880 7507 3854 7504
      3844 7512
TIME...MOT...LOC 0202Z 270DEG 38KT 3892 7581 3870 7566
          3840 7589

$$

DEC001-005-MDC011-041-230245-
/O.CON.KPHI.SV.W.0071.000000T0000Z-100623T0245Z/
KENT DE-CAROLINE MD-TALBOT MD-SUSSEX DE-
1006 PM EDT TUE JUN 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR SUSSEX...EAST CENTRAL TALBOT...SOUTHERN CAROLINE AND SOUTHERN
KENT COUNTIES...

AT 1000 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM DENTON TO FEDERALSBURG TO 20 MILES SOUTHWEST OF
BETHEL...OR ALONG A LINE EXTENDING FROM 15 MILES SOUTHEAST OF
CENTERVILLE TO 16 MILES WEST OF GEORGETOWN TO 18 MILES WEST OF
SALISBURY...MOVING EAST AT 45 MPH.

DOPPLER RADAR CONTINUES TO INDICATE POCKETS OF 50 TO 60 MPH AT 1000 
FT MOVING EAST WITH A LINE OF SCATTERED THUNDERSTORMS.  

STRONGEST WINDS WERE APPROACHING SMITHVILLE AND AGNER IN EASTERN 
MARYLAND AND ON TOWARD BRIDGEVILLE DELAWARE. 

SEVERE THUNDERSTORMS WILL BE NEAR...
  ANDREWSVILLE...SEAFORD...BRIDGEVILLE AND BLADES BY 1010 PM EDT...
  LAUREL...GREENWOOD AND FARMINGTON BY 1015 PM EDT...
  HARRINGTON AND SYCAMORE BY 1020 PM EDT...
  HOUSTON BY 1025 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 3846 7570 3865 7572 3869 7583 3870 7591
      3871 7596 3875 7598 3874 7603 3877 7605
      3885 7595 3894 7590 3894 7624 3894 7530
      3881 7518 3879 7513 3880 7507 3854 7504
      3844 7512
TIME...MOT...LOC 0202Z 270DEG 38KT 3892 7581 3870 7566
          3840 7589

$$
DRAG

737 
WWUS51 KPHI 230213
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1013 PM EDT TUE JUN 22 2010

MDC041-230222-
/O.CAN.KPHI.SV.W.0071.000000T0000Z-100623T0245Z/
TALBOT MD-
1013 PM EDT TUE JUN 22 2010

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL TALBOT COUNTY IS
CANCELLED...

LAT...LON 3846 7570 3865 7572 3867 7578 3871 7580
      3874 7581 3876 7583 3881 7582 3886 7581
      3894 7577 3894 7530 3881 7518 3879 7513
      3880 7507 3854 7504 3844 7512
TIME...MOT...LOC 0212Z 262DEG 36KT 3893 7571 3880 7558
          3840 7578

$$

DEC001-005-MDC011-230245-
/O.CON.KPHI.SV.W.0071.000000T0000Z-100623T0245Z/
KENT DE-CAROLINE MD-SUSSEX DE-
1013 PM EDT TUE JUN 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR SUSSEX...SOUTHEASTERN CAROLINE AND SOUTHERN KENT COUNTIES...

AT 1009 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM 8 MILES NORTHWEST OF ANDREWSVILLE TO
GREENWOOD TO 16 MILES SOUTHWEST OF BETHEL...OR ALONG A LINE EXTENDING
FROM 18 MILES SOUTHEAST OF CENTERVILLE TO 14 MILES NORTHWEST OF
GEORGETOWN TO 13 MILES WEST OF SALISBURY...MOVING EAST AT 40 MPH.

THIS STORM IS WORSENING AS IT MOVES EAST AND SUBSTANTIAL DAMAGING 
WIND APPEARS TO HAVE MOVED IN OR NEAR SMITHVILLE MARYLAND AND IS 
HEADING FOR GREENWOOD AND BRIDGEVILLE DELAWARE. 

SEVERE THUNDERSTORMS WILL BE NEAR...
  HARRINGTON AND BETHEL BY 1020 PM EDT...
  LAUREL...HOUSTON AND ELLENDALE BY 1025 PM EDT...
  SYCAMORE AND MILFORD BY 1030 PM EDT...
  MILTON AND GEORGETOWN BY 1035 PM EDT...
  GUMBORO BY 1040 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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 3846 7570 3865 7572 3867 7578 3871 7580
      3874 7581 3876 7583 3881 7582 3886 7581
      3894 7577 3894 7530 3881 7518 3879 7513
      3880 7507 3854 7504 3844 7512
TIME...MOT...LOC 0212Z 262DEG 36KT 3893 7571 3880 7558
          3840 7578

$$

DRAG

548 
WWUS51 KPHI 230239
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1039 PM EDT TUE JUN 22 2010

MDC011-230248-
/O.CAN.KPHI.SV.W.0071.000000T0000Z-100623T0245Z/
CAROLINE MD-
1039 PM EDT TUE JUN 22 2010

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CAROLINE COUNTY
IS CANCELLED...

LAT...LON 3847 7549 3858 7546 3866 7547 3870 7549
      3873 7549 3882 7546 3894 7544 3894 7530
      3881 7518 3879 7513 3880 7507 3854 7504
      3844 7512
TIME...MOT...LOC 0238Z 262DEG 36KT 3897 7538 3884 7525
          3844 7545

$$

DEC001-005-230245-
/O.CON.KPHI.SV.W.0071.000000T0000Z-100623T0245Z/
KENT DE-SUSSEX DE-
1039 PM EDT TUE JUN 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR EASTERN SUSSEX AND SOUTHEASTERN KENT COUNTIES...

AT 1036 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE 
OF PRODUCING WINDS OF 50 TO 60 MPH.  THESE STORMS WERE LOCATED 
ALONG A LINE EXTENDING FROM MILFORD TO MILTON TO 7 MILES SOUTHWEST 
OF GUMBORO...OR ALONG A LINE EXTENDING FROM 15 MILES SOUTHEAST OF 
DOVER TO 12 MILES NORTHEAST OF GEORGETOWN TO 8 MILES NORTHEAST OF 
SALISBURY...MOVING EAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  LEWES...DAGSBORO...FRANKFORD AND MILLSBORO BY 1045 PM EDT...

LAT...LON 3847 7549 3858 7546 3866 7547 3870 7549
      3873 7549 3882 7546 3894 7544 3894 7530
      3881 7518 3879 7513 3880 7507 3854 7504
      3844 7512
TIME...MOT...LOC 0238Z 262DEG 36KT 3897 7538 3884 7525
          3844 7545

$$


DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 8:00 PM EDT	Severe Thunderstorm Warning	PHI	Kent	30 min
Jun 22, 8:14 PM EDT	Special Weather Statement	PHI	Kent, New Castle	61 min
Jun 22, 8:29 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	46 min
Jun 22, 9:33 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	27 min
Jun 22, 10:36 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jun 22, 10:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	41 min
Jun 22, 11:51 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jun 23, 12:58 AM EDT	Special Weather Statement	PHI	Sussex	92 min
Jun 22, 9:12 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	18 min
Jun 22, 9:39 PM EDT	Special Weather Statement	PHI	Caroline	66 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2010 Severe Thunderstorm Warnings in Delaware, 2010 Every severe thunderstorm warning in 2010

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.