Alert archive / Maryland / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 60, NWS Philadelphia/Mount Holly

June 30, 2013Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 30, 2013, 12:34 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 41 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
Jun 30, 2013, 12:34 PM EDT (16:34 UTC)
Expired
Jun 30, 2013, 1:15 PM EDT
In force
41 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 71 km from the middle of the area, began a volume at 16:34 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.6 hours before the alert went out and 102 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 12:00Z on 2013-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 97 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, Washington/Dulle, VA at 12:00Z on 2013-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939587897Sfc1 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
97 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1167 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

082 
WUUS51 KPHI 301634
SVRPHI
MDC029-035-301715-
/O.NEW.KPHI.SV.W.0060.130630T1634Z-130630T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1234 PM EDT SUN JUN 30 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN KENT COUNTY IN NORTHEAST MARYLAND...
  WESTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...

* UNTIL 115 PM EDT

* AT 1230 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  STEVENSVILLE TO STEVENSVILLE SOUTH...MOVING NORTHEAST AT 35 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
  60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  GRASONVILLE AROUND 1240 PM EDT...
  ROCK HALL AND GRASONVILLE AROUND 1245 PM EDT...
  OVERTON AROUND 1250 PM EDT...
  LANGFORD AROUND 1255 PM EDT...
  CHESTERTOWN AND OLD TOWN AROUND 105 PM EDT...
  STARKEY CORNER AROUND 110 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CREATE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE OF SEVERE
THUNDERSTORMS...WHICH COULD FLOOD LOW LYING AREAS QUICKLY AND COVER
ROADS WITH WATER. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD.

NEARLY CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS
LINE OF SEVERE THUNDERSTORMS. WHEN THUNDER ROARS...MOVE INDOORS!
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3895 7637 3905 7631 3899 7627 3898 7621
      3900 7618 3901 7619 3900 7621 3900 7623
      3903 7625 3910 7624 3914 7627 3936 7598
      3919 7591 3893 7621 3894 7624 3892 7625
      3890 7637
TIME...MOT...LOC 1634Z 228DEG 29KT 3907 7629 3899 7634

$$

FORECASTER:  DRAG
1 follow-up statement
047 
WWUS51 KPHI 301659
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1259 PM EDT SUN JUN 30 2013

MDC029-035-301709-
/O.CAN.KPHI.SV.W.0060.000000T0000Z-130630T1715Z/
KENT MD-QUEEN ANNE'S MD-
1259 PM EDT SUN JUN 30 2013

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN QUEEN ANNE'S AND
WESTERN KENT COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED TO BELOW SEVERE LIMITS...THEREFORE THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

THERE HAVE BEEN NO REPORTS OF DAMAGING WIND.  

LAT...LON 3895 7637 3905 7631 3899 7627 3898 7621
      3900 7618 3901 7619 3900 7621 3900 7623
      3903 7625 3910 7624 3914 7627 3936 7598
      3919 7591 3893 7621 3894 7624 3892 7625
      3890 7637
TIME...MOT...LOC 1659Z 228DEG 29KT 3920 7610 3912 7615

$$

FORECASTER:  DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 11:05 AM EDTSpecial Weather StatementPHICecil40 min
Jun 30, 11:18 AM EDTAreal Flood AdvisoryPHICecil117 min
Jun 30, 11:45 AM EDTFlash Flood WarningPHICecil5 hr
Jun 30, 12:29 PM EDTSpecial Weather StatementPHIKent, Queen Anne's46 min
Jun 30, 1:28 PM EDTSpecial Weather StatementPHIQueen Anne's62 min
Jun 30, 1:34 PM EDTAreal Flood AdvisoryPHIKent, Queen Anne's5 hr
Jun 30, 6:48 PM EDTAreal Flood AdvisoryPHIKent, Queen Anne's4 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2013Every severe thunderstorm warning in 2013

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.