Alert archive / Maryland / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 124, NWS Philadelphia/Mount Holly

July 24, 2017Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 24, 2017, 1:05 AM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 55 min. 3 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: Jul 24, 2017, 1:05 AM EDT (05:05 UTC)
Expired: Jul 24, 2017, 2:00 AM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 05:04 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
Jul 24, 1:29 AM EDT	TORNADO	Stevensville South, MD	* 1 INJ * NWS STORM SURVEY HAS CONFIRMED AN EF2 TORNADO CAME ASHORE AT 129 AM AND LIFTED AT 133 AM IN STEVENSVILLE. MAXIMUM WINDS AT 125 MPH. SEVERAL STRUCTURES DAMAGED WITH ROOF TORN OFF. UPPER FLOORS OF TOWNHOMES TORE OFF. ONE INJURY FROM A PUNCTURE. TRE
Jul 24, 1:31 AM EDT	TSTM WND DMG	Stevensville, MD	MULTIPLE ROOFS OFF OF HOMES. MULTIPLE TREES DOWN. A HOUSE WAS ON FIRE. BOATS WERE TOSSED INTO PEOPLES YARDS FROM THE HARBOR. TIME ESTIMATED FROM RADAR.
Jul 24, 1:31 AM EDT	TSTM WND DMG	Stevensville, MD	REPORT OF A STRUCTURE COLLAPSE... SEVERAL HOMES WITH GAS LEAKS... WIRES DOWN... AND POLES DOWN. EVENT TIME IS ESTIMATED.

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, 5.1 hours before the alert went out and 105 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: 431 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1103 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

433 
WUUS51 KPHI 240505
SVRPHI
MDC029-035-240600-
/O.NEW.KPHI.SV.W.0124.170724T0505Z-170724T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
105 AM EDT MON JUL 24 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Queen Anne's County in northeastern Maryland...
  Western Kent County in northeastern Maryland...

* Until 200 AM EDT

* At 105 AM EDT, a severe thunderstorm was located over Severn River,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Centerville, Chestertown, Centreville, Rock Hall, Church Hill, Old
  Town, Grasonville, Starr, Stevensville, Langford, Chester, Newtown,
  Overton, Starkey Corner, Wye Mills, Morgnec, Carville, Hope,
  Queenstown and Barclay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3893 7636 3904 7631 3898 7628 3897 7622
      3900 7617 3903 7624 3909 7623 3917 7628
      3932 7616 3921 7589 3910 7583 3896 7594
      3892 7620 3896 7624 3893 7626 3896 7631
TIME...MOT...LOC 0505Z 249DEG 22KT 3900 7645 

HAIL...<.75IN
WIND...60MPH
 
$$

JRK

2 follow-up statements

419 
WWUS51 KPHI 240530
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
130 AM EDT MON JUL 24 2017

MDC029-035-240600-
/O.CON.KPHI.SV.W.0124.000000T0000Z-170724T0600Z/
Queen Anne's MD-Kent MD-
130 AM EDT MON JUL 24 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR QUEEN ANNE'S AND SOUTHWESTERN KENT COUNTIES...

At 130 AM EDT, a severe thunderstorm was located over Stevensville,
or 8 miles southeast of Gibson Island, moving east at 25 mph.

HAZARD...70 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Centerville, Chestertown, Centreville, Rock Hall, Church Hill, Old
Town, Grasonville, Starr, Stevensville, Langford, Chester, Overton,
Starkey Corner, Wye Mills, Morgnec, Carville, Hope, Queenstown,
Barclay and Stevensville South.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm is capable of producing all types of severe 
weather including large hail, destructive straight line winds and 
tornadoes. Move quickly to a safe shelter, such as an interior room, 
a bathroom or closet or basement.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3893 7636 3904 7631 3898 7628 3897 7622
      3900 7617 3903 7624 3909 7623 3917 7628
      3919 7626 3928 7606 3921 7589 3910 7583
      3896 7594 3892 7620 3896 7624 3893 7626
      3896 7631
TIME...MOT...LOC 0530Z 251DEG 21KT 3902 7629 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...70MPH
 
$$

JRK

657 
WWUS51 KPHI 240538
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
138 AM EDT MON JUL 24 2017

MDC029-035-240600-
/O.CON.KPHI.SV.W.0124.000000T0000Z-170724T0600Z/
Queen Anne's MD-Kent MD-
138 AM EDT MON JUL 24 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR QUEEN ANNE'S AND SOUTHWESTERN KENT COUNTIES...

At 137 AM EDT, a severe thunderstorm was located over Overton, or 7
miles west of Centerville, moving east at 45 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely. 

Locations impacted include...
Centerville, Chestertown, Centreville, Rock Hall, Church Hill, Old
Town, Grasonville, Starr, Stevensville, Langford, Chester, Overton,
Starkey Corner, Wye Mills, Morgnec, Carville, Hope, Queenstown,
Barclay and Stevensville South.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the 
basement or small central room in a sturdy structure. A Tornado 
Warning is in effect.

This is a potentially deadly storm. Seek shelter in an interior room
on the lowest floor of a well-built structure. Abandon vehicles in
search of a more substantial permanent structure. Stay away from
windows.

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

&&

LAT...LON 3893 7635 3894 7636 3904 7631 3898 7628
      3897 7622 3900 7617 3903 7624 3909 7623
      3915 7627 3918 7622 3926 7600 3921 7589
      3910 7583 3896 7594 3892 7620 3896 7624
      3893 7626 3896 7631
TIME...MOT...LOC 0537Z 253DEG 38KT 3900 7620 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...80MPH
 
$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 9:28 PM EDT	Areal Flood Warning	PHI	Cecil	8 hr
Jul 24, 1:10 AM EDT	Areal Flood Advisory	PHI	Cecil	4 hr
Jul 24, 1:27 AM EDT	Tornado Warning	PHI	Kent, Queen Anne's	21 min
Jul 24, 1:52 AM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	53 min
Jul 24, 2:02 AM EDT	Severe Thunderstorm Warning	PHI	Cecil	43 min
Jul 24, 4:40 AM EDT	Areal Flood Warning	PHI	Cecil	4 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.