Alert archive / Maryland / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 30, NWS Philadelphia/Mount Holly

May 19, 20174 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2017, 8:13 PM EDT for 4 counties in Maryland. It was in force for 32 min. 1 report 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, 2017, 8:13 PM EDT (00:13 UTC)
Expired
May 19, 2017, 8:45 PM EDT
In force
32 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

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

The radar

The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 00:14 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

TimeReportWhereRemark
May 19, 8:25 PM EDTTSTM WND DMGRoberts, MDPOWER POLES AND LINES BLOWN DOWN ON VEHICLES IN THE 1600 BLOCK OF ROBERTS STATION ROAD. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.2 hours before the alert went out and 104 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 2017-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 217 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2017-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
217 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
1704 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

188 
WUUS51 KPHI 200013
SVRPHI
MDC011-029-035-041-200045-
/O.NEW.KPHI.SV.W.0030.170520T0013Z-170520T0045Z/

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

The National Weather Service in Mount Holly NJ  has issued a

* Severe Thunderstorm Warning for...
  Northeastern Talbot County in eastern Maryland...
  Queen Anne's County in northeastern Maryland...
  Northern Caroline County in eastern Maryland...
  Southwestern Kent County in northeastern Maryland...

* Until 845 PM EDT

* At 813 PM EDT, a severe thunderstorm was located over Old Town, or
  near Centerville, moving east at 35 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Centerville, Denton, Centreville, Greensboro, Oakland, Ridgely,
  Rock Hall, Church Hill, Sudlersville, Goldsboro, Queen Anne, Old
  Town, Grasonville, Starr, Jumptown, Stevensville, Chester, Overton,
  Starkey Corner and Wye Mills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

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 3904 7631 3898 7628 3897 7622 3900 7617
      3903 7624 3909 7623 3915 7628 3918 7627
      3920 7575 3887 7573 3891 7620 3894 7621
      3894 7624 3896 7625 3892 7626 3894 7627
      3892 7631
TIME...MOT...LOC 0013Z 274DEG 31KT 3912 7609 

HAIL...1.25IN
WIND...60MPH
 
$$

CMS
2 follow-up statements
110 
WWUS51 KPHI 200027
SVSPHI

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

MDC011-029-035-041-200045-
/O.CON.KPHI.SV.W.0030.000000T0000Z-170520T0045Z/
Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
827 PM EDT FRI MAY 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR NORTHEASTERN TALBOT...QUEEN ANNE'S...NORTHERN CAROLINE AND
SOUTHWESTERN KENT COUNTIES...

At 827 PM EDT, a severe thunderstorm was located over Starkey Corner,
or near Centerville, moving east at 25 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...
Centerville, Denton, Centreville, Greensboro, Oakland, Ridgely,
Church Hill, Sudlersville, Goldsboro, Queen Anne, Old Town, Starr,
Jumptown, Starkey Corner, Wye Mills, Carville, Hope, Cordova,
Queenstown and Hillsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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 3893 7621 3898 7620 3900 7617 3901 7620
      3918 7619 3920 7575 3887 7573 3891 7620
TIME...MOT...LOC 0027Z 278DEG 22KT 3910 7602 

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

CMS
595 
WWUS51 KPHI 200045
SVSPHI

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

MDC011-029-035-041-200054-
/O.EXP.KPHI.SV.W.0030.000000T0000Z-170520T0045Z/
Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
845 PM EDT FRI MAY 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TALBOT...QUEEN
ANNE'S...NORTHERN CAROLINE AND SOUTHWESTERN KENT COUNTIES WILL EXPIRE
AT 845 PM EDT...
                
The storm which prompted the warning has weakened to just 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3893 7621 3898 7620 3900 7617 3901 7620
      3918 7619 3920 7575 3887 7573 3891 7620
TIME...MOT...LOC 0044Z 274DEG 31KT 3909 7584 

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 8:47 PM EDTSpecial Weather StatementPHICaroline, Talbot43 min
May 19, 11:51 PM EDTSpecial Weather StatementPHIQueen Anne's24 min
May 20, 12:09 AM EDTSpecial Weather StatementPHICaroline21 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2017Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.