Alert archive / Maryland / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 87, NWS Philadelphia/Mount Holly

August 1, 2013Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2013, 9:53 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 67 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 1, 2013, 9:53 PM EDT (01:53 UTC)
Expired
Aug 1, 2013, 11:00 PM EDT
In force
67 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), 76 km from the middle of the area, began a volume at 01:55 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 00:00Z, 1.9 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 2013-08-02Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2013-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
19 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
31 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.

411 
WUUS51 KPHI 020153
SVRPHI
MDC029-035-020300-
/O.NEW.KPHI.SV.W.0087.130802T0153Z-130802T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
953 PM EDT THU AUG 1 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1100 PM EDT

* AT 951 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR ROCK HALL...MOVING
  SOUTHEAST AT 10 MPH. THIS STORM IS CAPABLE OF PRODUCING ONE INCH
  DIAMETER HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LANGFORD AROUND 1005 PM EDT...
  OLD TOWN AROUND 1030 PM EDT...
  OVERTON AROUND 1045 PM EDT...
  STARKEY CORNER AROUND 1100 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE
NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS
SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM ON THE LOWEST
FLOOR.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE
THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3917 7627 3918 7628 3920 7626 3923 7621
      3911 7599 3900 7618 3901 7619 3900 7621
      3907 7625 3913 7626 3914 7629 3917 7629
TIME...MOT...LOC 0153Z 320DEG 7KT 3915 7624

$$
 
TFG
2 follow-up statements
305 
WWUS51 KPHI 020216
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1016 PM EDT THU AUG 1 2013

MDC029-035-020300-
/O.CON.KPHI.SV.W.0087.000000T0000Z-130802T0300Z/
KENT MD-QUEEN ANNE'S MD-
1016 PM EDT THU AUG 1 2013

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

AT 1012 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS TO
60 MPH. THIS STORM WAS LOCATED NEAR OLD TOWN...OR 22 MILES
SOUTHEAST OF MIDDLE RIVER...MOVING SOUTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
STARKEY CORNER AROUND 1040 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO 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 3902 7618 3902 7619 3906 7621 3910 7621
      3913 7619 3915 7618 3917 7611 3911 7599
      3901 7617
TIME...MOT...LOC 0216Z 300DEG 12KT 3911 7613

$$

TFG
308 
WWUS51 KPHI 020229
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1029 PM EDT THU AUG 1 2013

MDC029-035-020238-
/O.CAN.KPHI.SV.W.0087.000000T0000Z-130802T0300Z/
KENT MD-QUEEN ANNE'S MD-
1029 PM EDT THU AUG 1 2013

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

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS WEAKENED
AND NO LONGER POSES THE THREAT TO PRODUCE DAMAGING WINDS OR LARGE HAIL.
 
LAT...LON 3902 7618 3902 7619 3906 7621 3910 7621
      3913 7619 3915 7618 3917 7611 3911 7599
      3901 7617
TIME...MOT...LOC 0228Z 320DEG 7KT 3910 7618

$$
 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 8:54 PM EDTSpecial Weather StatementPHIKent66 min
Aug 1, 9:23 PM EDTAreal Flood AdvisoryPHIKent3 hr
Aug 1, 10:24 PM EDTAreal Flood AdvisoryPHIQueen Anne's3 hr
Aug 1, 11:01 PM EDTSpecial Weather StatementPHIQueen Anne's59 min

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.