Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 57, NWS Philadelphia/Mount Holly

May 19, 2011Cecil County, Kent County, Maryland; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2011, 5:13 PM EDT for Cecil County, Kent County, Maryland; New Castle County, Delaware. It was in force for 62 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 19, 2011, 5:13 PM EDT (21:13 UTC)
Expired: May 19, 2011, 6:15 PM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Kent County, MD

The radar

The Dover AFB radar (KDOX), 83 km from the middle of the area, began a volume at 21:16 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.

What was reported inside it

Time	Report	Where	Remark
May 19, 5:48 PM EDT	HAIL 0.25	Middletown, DE
May 19, 6:02 PM EDT	HAIL 0.25	Middletown, DE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 11 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 143 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 53 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.

282 
WUUS51 KPHI 192113
SVRPHI
DEC003-MDC015-029-192215-
/O.NEW.KPHI.SV.W.0057.110519T2113Z-110519T2215Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...
  NORTHEASTERN KENT COUNTY IN NORTHEAST MARYLAND...
  SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF MIDDLETOWN...

* UNTIL 615 PM EDT

* AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR KENNEDYVILLE...OR 14 MILES SOUTHWEST OF
  MIDDLETOWN...AND MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CECILTON AROUND 530 PM EDT...
  SASSAFRAS AROUND 535 PM EDT...
  SASSAFRAS AROUND 540 PM EDT...
  WARWICK AND CAYOTS AROUND 545 PM EDT...
  BOHEMIAS MILLS AROUND 555 PM EDT...
  MIDDLETOWN AROUND 600 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3938 7607 3941 7605 3942 7602 3945 7600
      3946 7602 3950 7601 3951 7599 3954 7600
      3970 7585 3937 7558 3925 7600 3938 7612
TIME...MOT...LOC 2113Z 234DEG 15KT 3937 7596

$$

PO

1 follow-up statement

902 
WWUS51 KPHI 192157
SVSPHI

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

MDC015-029-192207-
/O.CAN.KPHI.SV.W.0057.000000T0000Z-110519T2215Z/
CECIL MD-KENT MD-
557 PM EDT THU MAY 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENT AND EASTERN
CECIL COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3940 7576 3954 7576 3954 7572 3937 7558
      3933 7574
TIME...MOT...LOC 2157Z 234DEG 15KT 3948 7577

$$

DEC003-192215-
/O.CON.KPHI.SV.W.0057.000000T0000Z-110519T2215Z/
NEW CASTLE DE-
557 PM EDT THU MAY 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHWESTERN NEW CASTLE COUNTY...

AT 554 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR MIDDLETOWN...MOVING NORTHEAST AT
15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOUNT PLEASANT AND ODESSA BY 610 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3940 7576 3954 7576 3954 7572 3937 7558
      3933 7574
TIME...MOT...LOC 2157Z 234DEG 15KT 3948 7577

$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 9:10 PM EDT	Coastal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	11 hr
May 18, 11:46 PM EDT	Special Weather Statement	PHI	Caroline	59 min
May 19, 12:11 PM EDT	Special Weather Statement	PHI	Caroline	94 min
May 19, 12:43 PM EDT	Tornado Warning	PHI	Kent, Queen Anne's	32 min
May 19, 12:54 PM EDT	Special Weather Statement	PHI	Cecil	66 min
May 19, 1:00 PM EDT	Special Weather Statement	PHI	Caroline	60 min
May 19, 1:37 PM EDT	Areal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's	6 hr
May 19, 2:19 PM EDT	Special Weather Statement	PHI	Cecil	56 min
May 19, 3:39 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's, Talbot	51 min
May 19, 4:47 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	88 min
May 19, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	46 min
May 19, 3:01 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
May 19, 3:52 PM EDT	Coastal Flood Statement	PHI	Kent, New Castle, Sussex	8 hr
May 19, 5:11 PM EDT	Severe Thunderstorm Warning	PHI	Kent	34 min
May 19, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	Kent	29 min
May 19, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	53 min
May 19, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Kent	30 min
May 19, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	18 min
May 19, 6:53 PM EDT	Special Weather Statement	PHI	Sussex	67 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2011 Severe Thunderstorm Warnings in Delaware, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.