Alert archive / Maryland / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 52, NWS Philadelphia/Mount Holly

June 20, 2015Caroline County, Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 20, 2015, 9:57 PM EDT for Caroline County, Kent County, Queen Anne's County, Maryland. It was in force for 63 min. 2 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 20, 2015, 9:57 PM EDT (01:57 UTC)
Expired
Jun 20, 2015, 11:00 PM EDT
In force
63 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Caroline 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 01:57 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

TimeReportWhereRemark
Jun 20, 10:18 PM EDTTSTM WND GST 49Stevensville, MD
Jun 20, 10:38 PM EDTTSTM WND DMGChestertown, MDTREE DOWN

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.

IssuedProductOfficeLasted
Jun 20, 8:56 PM EDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.0 hours before the alert went out and 142 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, Wallops Is Stn, VA at 00:00Z on 2015-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 261 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, Wallops Is Stn, VA at 00:00Z on 2015-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
261 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
1179 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

890 
WUUS51 KPHI 210157
SVRPHI
MDC011-029-035-210300-
/O.NEW.KPHI.SV.W.0052.150621T0157Z-150621T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
957 PM EDT SAT JUN 20 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
  NORTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...
  KENT COUNTY IN NORTHEASTERN MARYLAND...

* UNTIL 1100 PM EDT

* AT 955 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE 
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 
  MPH. THESE STORMS WERE LOCATED OVER THE CENTRAL PORTION OF 
  CHESAPEAKE BAY...AND MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CENTERVILLE...CHESTERTOWN...CENTREVILLE...GREENSBORO...OAKLAND...
  RIDGELY...ROCK HALL...CHURCH HILL...MILLINGTON...SUDLERSVILLE...
  BETTERTON...GOLDSBORO...OLD TOWN...KENNEDYVILLE...STARR...HOPE...
  MASSEY...GRASONVILLE...MORGNEC AND JUMPTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 3904 7631 3898 7628 3900 7617 3903 7624
      3909 7623 3915 7628 3929 7617 3932 7618
      3938 7606 3938 7577 3894 7575 3892 7620
      3897 7625 3891 7624 3892 7625 3894 7628
      3889 7629 3896 7631 3885 7637 3886 7637
TIME...MOT...LOC 0155Z 238DEG 35KT 3886 7648 

$$

AMC
1 follow-up statement
078 
WWUS51 KPHI 210229
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1029 PM EDT SAT JUN 20 2015

MDC011-029-035-210300-
/O.CON.KPHI.SV.W.0052.000000T0000Z-150621T0300Z/
QUEEN ANNE'S MD-CAROLINE MD-KENT MD-
1029 PM EDT SAT JUN 20 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR QUEEN ANNE'S...NORTHEASTERN CAROLINE AND KENT COUNTIES...

AT 1029 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
WAS LOCATED OVER CHURCH HILL...OR 7 MILES NORTHEAST OF CENTERVILLE...
MOVING NORTHEAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
CENTERVILLE...CHESTERTOWN...CENTREVILLE...GREENSBORO...OAKLAND...
RIDGELY...ROCK HALL...CHURCH HILL...MILLINGTON...SUDLERSVILLE...
BETTERTON...GOLDSBORO...OLD TOWN...KENNEDYVILLE...STARR...HOPE...
MASSEY...GRASONVILLE...MORGNEC AND JUMPTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 3904 7631 3898 7628 3900 7617 3903 7624
      3909 7623 3915 7628 3929 7617 3932 7618
      3938 7606 3938 7577 3894 7575 3892 7620
      3897 7625 3891 7624 3892 7625 3894 7628
      3889 7629 3896 7631 3885 7637 3886 7637
TIME...MOT...LOC 0229Z 236DEG 52KT 3912 7596 

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 8:31 PM EDTSpecial Weather StatementPHICaroline, Cecil, Queen Anne's, Talbot3 hr
Jun 20, 9:35 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot55 min
Jun 20, 9:49 PM EDTSevere Thunderstorm WarningPHICecil56 min
Jun 20, 10:32 PM EDTSevere Thunderstorm WarningPHICaroline46 min
Jun 21, 12:47 AM EDTAreal Flood AdvisoryPHICecil4 hr
Jun 21, 4:45 AM EDTSpecial Weather StatementPHIQueen Anne's30 min
Jun 21, 5:12 AM EDTAreal Flood AdvisoryPHICaroline, Cecil, Kent, Queen Anne's, Talbot4 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2015Every severe thunderstorm warning in 2015

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.