Alert archive / Maryland / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 29, NWS Philadelphia/Mount Holly

May 19, 2017Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2017, 4:21 PM EDT for Cecil County, Maryland. It was in force for 24 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, 2017, 4:21 PM EDT (20:21 UTC)
Expired: May 19, 2017, 4:45 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 92 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 141 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: 268 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1596 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

725 
WUUS51 KPHI 192021
SVRPHI
MDC015-192045-
/O.NEW.KPHI.SV.W.0029.170519T2021Z-170519T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
421 PM EDT FRI MAY 19 2017

The National Weather Service in Mount Holly NJ  has issued a

* Severe Thunderstorm Warning for...
  Eastern Cecil County in northeastern Maryland...

* Until 445 PM EDT

* At 420 PM EDT, a severe thunderstorm was located near Charlestown,
  or near Havre De Grace, moving east at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Elkton, North East, Charlestown, Brantwood, Cherry Hill, Barksdale,
  Cayots, Hollywood Beach, Perryville and Chesapeake City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

In addition to large hail and 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 3970 7579 3945 7578 3943 7600 3946 7601
      3952 7598 3955 7603 3955 7608 3959 7611
TIME...MOT...LOC 2020Z 253DEG 14KT 3953 7600 

HAIL...1.00IN
WIND...60MPH
 
$$

CMS

2 follow-up statements

553 
WWUS51 KPHI 192036
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
436 PM EDT FRI MAY 19 2017

MDC015-192045-
/O.CON.KPHI.SV.W.0029.000000T0000Z-170519T2045Z/
Cecil MD-
436 PM EDT FRI MAY 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN CECIL COUNTY...

At 436 PM EDT, a severe thunderstorm was located over Hollywood
Beach, or 9 miles southwest of Elkton, moving east at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect damage to 
         trees and power lines. 

Locations impacted include...
Elkton, Charlestown, Brantwood, Hollywood Beach, Cayots and
Chesapeake City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

In addition to large hail and 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 3945 7601 3947 7601 3952 7598 3953 7600
      3957 7600 3959 7579 3945 7578 3943 7600
TIME...MOT...LOC 2036Z 272DEG 16KT 3948 7592 

HAIL...1.00IN
WIND...60MPH
 
$$

CMS

725 
WWUS51 KPHI 192045
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
445 PM EDT FRI MAY 19 2017

MDC015-192054-
/O.EXP.KPHI.SV.W.0029.000000T0000Z-170519T2045Z/
Cecil MD-
445 PM EDT FRI MAY 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CECIL COUNTY WILL
EXPIRE AT 445 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small 
hail, gusty winds and heavy rain are still possible with this 
thunderstorm.

LAT...LON 3945 7601 3947 7601 3952 7598 3953 7600
      3957 7600 3959 7579 3945 7578 3943 7600
TIME...MOT...LOC 2044Z 253DEG 14KT 3949 7589 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 3:48 PM EDT	Special Weather Statement	PHI	Cecil	42 min
May 19, 4:40 PM EDT	Special Weather Statement	PHI	Kent	35 min
May 19, 5:12 PM EDT	Special Weather Statement	PHI	Kent	48 min
May 19, 7:58 PM EDT	Special Weather Statement	PHI	Queen Anne's, Talbot	62 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2017 Every severe thunderstorm warning in 2017

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.