Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 63, NWS Philadelphia/Mount Holly

May 19, 2011Caroline County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2011, 10:14 PM EDT for Caroline County, Talbot County, Maryland. It was in force for 61 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
May 19, 2011, 10:14 PM EDT (02:14 UTC)
Expired
May 19, 2011, 11:15 PM EDT
In force
61 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 48 km from the middle of the area, began a volume at 02:17 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, 2.2 hours before the alert went out and 106 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 2011-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 302 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 2011-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
302 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1322 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

183 
WUUS51 KPHI 200214
SVRPHI
MDC011-041-200315-
/O.NEW.KPHI.SV.W.0063.110520T0214Z-110520T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1014 PM EDT THU MAY 19 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  CENTRAL TALBOT COUNTY IN EASTERN MARYLAND...
  THIS INCLUDES THE CITY OF EASTON...

* UNTIL 1115 PM EDT

* AT 1009 PM 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
  COPPERVILLE...OR NEAR EASTON...AND MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EASTON AROUND 1025 PM EDT...
  MATTHEWS AND TANYARD AROUND 1045 PM EDT...
  GRIFFIN AROUND 1050 PM EDT...
  PRESTON AROUND 1055 PM EDT...
  HARMONY AROUND 1100 PM EDT...
  AGNER AND SMITHVILLE AROUND 1115 PM 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 3865 7572 3867 7576 3867 7580 3869 7583
      3869 7590 3866 7596 3873 7624 3879 7623
      3883 7620 3885 7621 3886 7615 3888 7615
      3887 7611 3891 7611 3888 7573
TIME...MOT...LOC 0214Z 279DEG 16KT 3881 7613

$$

HAYES
2 follow-up statements
389 
WWUS51 KPHI 200234
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1034 PM EDT THU MAY 19 2011

MDC011-041-200315-
/O.CON.KPHI.SV.W.0063.000000T0000Z-110520T0315Z/
CAROLINE MD-TALBOT MD-
1034 PM EDT THU MAY 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR CENTRAL TALBOT AND SOUTHERN CAROLINE COUNTIES...

AT 1030 PM 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 EASTON...MOVING EAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TANYARD...MATTHEWS AND 7 MILES SOUTH OF GRIFFIN BY 1045 PM EDT...
  6 MILES NORTH OF CHOPTANK AND 6 MILES NORTH OF WINDYHILL BY 1050 PM
  EDT...
  HARMONY AND PRESTON BY 1055 PM EDT...
  AGNER BY 1110 PM EDT...
  FEDERALSBURG AND SMITHVILLE BY 1115 PM EDT...

LAT...LON 3865 7572 3867 7576 3867 7580 3869 7583
      3869 7590 3866 7596 3873 7624 3879 7623
      3883 7620 3885 7621 3886 7615 3888 7615
      3887 7611 3891 7611 3888 7573
TIME...MOT...LOC 0235Z 286DEG 18KT 3879 7602

$$

HAYES
814 
WWUS51 KPHI 200312
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1112 PM EDT THU MAY 19 2011

MDC011-041-200323-
/O.EXP.KPHI.SV.W.0063.000000T0000Z-110520T0315Z/
CAROLINE MD-TALBOT MD-
1112 PM EDT THU MAY 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TALBOT AND SOUTHERN
CAROLINE COUNTIES WILL EXPIRE AT 1115 PM EDT...

LAT...LON 3865 7572 3867 7576 3867 7580 3869 7583
      3869 7590 3866 7596 3873 7624 3879 7623
      3883 7620 3885 7621 3886 7615 3888 7615
      3887 7611 3891 7611 3888 7573
TIME...MOT...LOC 0313Z 286DEG 18KT 3874 7579

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 11:11 PM EDTSpecial Weather StatementPHICaroline64 min
May 19, 11:27 PM EDTSpecial Weather StatementPHITalbot63 min

Nearby

Severe Thunderstorm Warnings in Maryland, 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.