Alert archive / Maryland / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 108, NWS Philadelphia/Mount Holly

July 18, 20124 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2012, 6:06 PM EDT for 4 counties in Maryland. It was in force for 39 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: Jul 18, 2012, 6:06 PM EDT (22:06 UTC)
Expired: Jul 18, 2012, 6:45 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 61 km from the middle of the area, began a volume at 22:07 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
Jul 18, 6:09 PM EDT	TSTM WND DMG	Centreville, MD	SCATTERED TREES DOWN ACROSS THE COUNTY EXTENDING FROM KENT ISLAND TO CRUMPTON.
Jul 18, 6:20 PM EDT	TSTM WND DMG	Ridgely, MD	WIRES DOWN IN RIDGELY.
Jul 18, 6:28 PM EDT	TSTM WND DMG	Goldsboro, MD	TREES REPORTED DOWN IN GOLDSBORO.

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
Jul 18, 12:41 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.1 hours before the alert went out and 54 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: 884 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 1666 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 10 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.

863 
WUUS51 KPHI 182206
SVRPHI
MDC011-029-035-041-182245-
/O.NEW.KPHI.SV.W.0108.120718T2206Z-120718T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
606 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  NORTHERN TALBOT COUNTY IN EASTERN MARYLAND...
  SOUTHERN KENT COUNTY IN NORTHEAST MARYLAND...
  QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...

* UNTIL 645 PM EDT

* AT 605 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 LANGFORD TO CARVILLE TO SKIPTON...OR ALONG A LINE EXTENDING
  FROM 27 MILES SOUTHWEST OF MIDDLETOWN TO 20 MILES NORTH OF EASTON
  TO 8 MILES NORTH OF EASTON...AND MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STARKEY CORNER...STARR...SKIPTON AND HOPE AROUND 615 PM EDT...
  CORDOVA AND CHURCH HILL AROUND 625 PM EDT...
  JUMPTOWN...CORDOVA AND QUEEN ANNE AROUND 630 PM EDT...
  OAKLAND AROUND 635 PM 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! 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
WEDNESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3885 7622 3887 7625 3886 7622 3889 7621
      3892 7624 3892 7621 3894 7623 3908 7614
      3925 7624 3929 7620 3926 7577 3898 7574
      3879 7581
TIME...MOT...LOC 2206Z 286DEG 16KT 3919 7610 3905 7602
          3888 7612

$$
DRAG

1 follow-up statement

366 
WWUS51 KPHI 182215
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
615 PM EDT WED JUL 18 2012

MDC011-029-035-041-182245-
/O.CON.KPHI.SV.W.0108.000000T0000Z-120718T2245Z/
KENT MD-TALBOT MD-CAROLINE MD-QUEEN ANNE'S MD-
615 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR QUEEN ANNE'S...NORTHERN CAROLINE...NORTHEASTERN TALBOT AND
SOUTHERN KENT COUNTIES...

AT 609 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 KINGSTOWN TO CARVILLE TO SKIPTON...OR ALONG A LINE
EXTENDING FROM 27 MILES SOUTHWEST OF MIDDLETOWN TO 19 MILES NORTH OF
EASTON TO 8 MILES NORTH OF EASTON...MOVING EAST AT 20 MPH.

RADAR INDICATES THE STRONGEST WINDS AT 611 PM WERE NEAR HOPE IN 
QUEEN ANNES COUNTY.  

SEVERE THUNDERSTORMS WILL BE NEAR...
  CORDOVA AND CHURCH HILL BY 625 PM EDT...
  JUMPTOWN...QUEEN ANNE AND HILLSBORO BY 630 PM EDT...
  OAKLAND AND RIDGELY BY 635 PM EDT...
  MATTHEWS AND GRIFFIN BY 640 PM EDT...
  GREENSBORO BY 645 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! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

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

&&

LAT...LON 3885 7619 3887 7625 3886 7622 3889 7621
      3890 7622 3891 7619 3894 7623 3908 7614
      3920 7618 3924 7605 3926 7577 3898 7574
      3879 7581
TIME...MOT...LOC 2214Z 286DEG 16KT 3918 7606 3904 7598
          3887 7608

$$
DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:37 PM EDT	Special Weather Statement	PHI	Kent	23 min
Jul 18, 4:47 PM EDT	Special Weather Statement	PHI	Cecil	28 min
Jul 18, 5:20 PM EDT	Special Weather Statement	PHI	Queen Anne's	40 min
Jul 18, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	25 min
Jul 18, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	37 min
Jul 18, 6:26 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	68 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2012 Every 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.