Alert archive / Maryland / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 113, NWS Philadelphia/Mount Holly

August 24, 20154 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 24, 2015, 8:52 PM EDT for 4 counties in Maryland. It was in force for 53 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
Aug 24, 2015, 8:52 PM EDT (00:52 UTC)
Expired
Aug 24, 2015, 9:45 PM EDT
In force
53 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.9 hours before the alert went out and 103 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, Washington/Dulle, VA at 00:00Z on 2015-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2015-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.19395878Sfc1 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
0 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

820 
WUUS51 KPHI 250052
SVRPHI
MDC015-029-035-041-250145-
/O.NEW.KPHI.SV.W.0113.150825T0052Z-150825T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
852 PM EDT MON AUG 24 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENT COUNTY IN NORTHEASTERN MARYLAND...
  NORTHWESTERN TALBOT COUNTY IN EASTERN MARYLAND...
  SOUTH CENTRAL CECIL COUNTY IN NORTHEASTERN MARYLAND...
  QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...

* UNTIL 945 PM EDT

* AT 851 PM EDT...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 BROOKLYN
  PARK TO SILLERY BAY TO NEAR SHADY SIDE...AND MOVING NORTHEAST AT 35
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ROMANCOKE AROUND 915 PM EDT.
  LANGFORD...OLD TOWN...CHESTER AND STEVENSVILLE AROUND 925 PM EDT.
  CHESTERTOWN...GRASONVILLE AND STARKEY CORNER AROUND 930 PM EDT.
  CHURCH HILL...OVERTON AND NEWTOWN AROUND 935 PM EDT.
  MORGNEC AND WYE MILLS AROUND 940 PM EDT.
  CENTERVILLE...CENTREVILLE...MILLINGTON...BETTERTON...CRUMPTON...
  STARR...KENNEDYVILLE...CARVILLE AND HOPE AROUND 945 PM EDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
QUEENSTOWN...KINGSTOWN...STEVENSVILLE SOUTH...GALENA...DOMINION AND
ROMANCOKE.

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.

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.

&&

LAT...LON 3903 7631 3904 7631 3898 7628 3900 7617
      3901 7621 3925 7623 3947 7599 3929 7583
      3894 7598 3886 7626 3887 7625 3889 7620
      3897 7625 3891 7624 3896 7631 3891 7634
      3884 7627 3884 7637
TIME...MOT...LOC 0051Z 241DEG 29KT 3923 7659 3906 7644 3879 7655 

$$

ROBERTSON
1 follow-up statement
896 
WWUS51 KPHI 250108
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
908 PM EDT MON AUG 24 2015

MDC015-029-035-041-250145-
/O.CON.KPHI.SV.W.0113.000000T0000Z-150825T0145Z/
KENT MD-CECIL MD-QUEEN ANNE'S MD-TALBOT MD-
908 PM EDT MON AUG 24 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR KENT...SOUTH CENTRAL CECIL...QUEEN ANNE'S AND NORTH CENTRAL
TALBOT COUNTIES...

AT 907 PM EDT...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 NEAR
MILLERS ISLAND TO NEAR ROCK HALL TO NEAR ROMANCOKE...MOVING NORTHEAST
AT 35 MPH.

THESE SEVERE STORMS WILL BE NEAR...
  ROCK HALL AROUND 910 PM EDT.
  LANGFORD AND OLD TOWN AROUND 925 PM EDT.
  CHESTERTOWN...GRASONVILLE...NEWTOWN AND STARKEY CORNER AROUND 930
PM EDT.
  CHURCH HILL AND OVERTON AROUND 935 PM EDT.
  BETTERTON...MORGNEC AND WYE MILLS AROUND 940 PM EDT.
  CENTERVILLE...CENTREVILLE...MILLINGTON...CRUMPTON...KENNEDYVILLE...
CARVILLE...STARR AND HOPE AROUND 945 PM EDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
QUEENSTOWN...KINGSTOWN...STEVENSVILLE SOUTH...GALENA...DOMINION AND
ROMANCOKE.

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.

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 3895 7598 3891 7607 3886 7626 3887 7625
      3889 7620 3897 7625 3891 7624 3896 7631
      3891 7634 3884 7627 3884 7637 3903 7631
      3904 7631 3898 7628 3900 7617 3901 7621
      3925 7623 3947 7599 3929 7583
TIME...MOT...LOC 0107Z 238DEG 29KT 3918 7634 3911 7629 3887 7639 

$$

ROBERTSON

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 8:04 PM EDTSpecial Weather StatementPHICecil41 min
Aug 24, 9:44 PM EDTSpecial Weather StatementPHIKent, Queen Anne's46 min
Aug 24, 9:51 PM EDTSpecial Weather StatementPHICaroline39 min
Aug 24, 10:31 PM EDTSpecial Weather StatementPHICaroline29 min

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; the sounding from the Mesonet's radiosonde archive.