Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 105, NWS Philadelphia/Mount Holly

June 10, 20114 counties in Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 10, 2011, 12:16 AM EDT for 4 counties in Maryland; Kent County, Delaware. It was in force for 59 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 10, 2011, 12:16 AM EDT (04:16 UTC)
Expired
Jun 10, 2011, 1:15 AM EDT
In force
59 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Dover AFB radar (KDOX), 37 km from the middle of the area, began a volume at 04:18 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.3 hours before the alert went out and 136 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 2011-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1702 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 2011-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 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
1702 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
1829 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
-9 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.

179 
WUUS51 KPHI 100416
SVRPHI
DEC001-MDC011-029-035-041-100515-
/O.NEW.KPHI.SV.W.0105.110610T0416Z-110610T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1216 AM EDT FRI JUN 10 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF DOVER...
  NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  EXTREME NORTHEASTERN TALBOT COUNTY IN EASTERN MARYLAND...
  EXTREME EAST CENTRAL KENT COUNTY IN NORTHEAST MARYLAND...
  EASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...

* UNTIL 115 AM EDT

* AT 1211 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  GOLDSBORO...OR 14 MILES EAST OF CENTERVILLE...AND MOVING EAST AT 20
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SANDTOWN AND HARTLY AROUND 1225 AM EDT...
  HAZLETTVILLE AROUND 1235 AM EDT...
  WOODSIDE AND VIOLA AROUND 1245 AM EDT...
  CAMDEN AROUND 1250 AM EDT...
  RISING SUN AND DOVER AROUND 1255 AM EDT...
  RISING SUN AND DOVER AROUND 100 AM 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.

&&

LAT...LON 3924 7592 3934 7545 3932 7543 3924 7538
      3920 7538 3916 7540 3907 7539 3903 7533
      3898 7530 3879 7597
TIME...MOT...LOC 0416Z 265DEG 17KT 3908 7576

$$

IOVINO
1 follow-up statement
291 
WWUS51 KPHI 100437
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1237 AM EDT FRI JUN 10 2011

MDC029-100447-
/O.CAN.KPHI.SV.W.0105.000000T0000Z-110610T0515Z/
KENT MD-
1237 AM EDT FRI JUN 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL KENT
COUNTY IS CANCELLED...

LAT...LON 3919 7592 3934 7545 3932 7543 3924 7538
      3920 7538 3916 7540 3907 7539 3903 7533
      3898 7530 3879 7597
TIME...MOT...LOC 0437Z 265DEG 17KT 3909 7563

$$

DEC001-MDC011-035-041-100515-
/O.CON.KPHI.SV.W.0105.000000T0000Z-110610T0515Z/
KENT DE-CAROLINE MD-QUEEN ANNE'S MD-TALBOT MD-
1237 AM EDT FRI JUN 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR EXTREME NORTHEASTERN TALBOT...EASTERN QUEEN ANNE'S...NORTHERN
CAROLINE AND KENT COUNTIES...

AT 1234 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR HAZLETTVILLE...OR 9 MILES SOUTHWEST OF DOVER...MOVING
EAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WOODSIDE AND VIOLA BY 1245 AM EDT...
  CAMDEN...WOODSIDE...WYOMING AND WOODSIDE EAST BY 1250 AM EDT...
  HIGHLAND ACRES...RODNEY VILLAGE...KENT ACRES AND DOVER BY 1255 AM
  EDT...

LAT...LON 3919 7592 3934 7545 3932 7543 3924 7538
      3920 7538 3916 7540 3907 7539 3903 7533
      3898 7530 3879 7597
TIME...MOT...LOC 0437Z 265DEG 17KT 3909 7563

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 8:45 PM EDTSevere Thunderstorm WarningPHICecil, Kent, Queen Anne's60 min
Jun 9, 11:29 PM EDTSpecial Weather StatementPHIQueen Anne's61 min
Jun 9, 11:46 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's, Talbot59 min
Jun 10, 1:01 AM EDTSpecial Weather StatementPHICaroline, Queen Anne's, Talbot119 min
Jun 9, 8:10 PM EDTSevere Thunderstorm WarningPHINew Castle65 min
Jun 9, 9:41 PM EDTSpecial Weather StatementPHIKent64 min
Jun 9, 9:59 PM EDTSpecial Weather StatementPHIKent31 min
Jun 10, 5:27 PM EDTSpecial Weather StatementPHISussex63 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2011Severe Thunderstorm Warnings in Delaware, 2011Every severe thunderstorm warning in 2011

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.