Alert archive / Maryland / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 2, NWS Philadelphia/Mount Holly

April 16, 20184 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 16, 2018, 3:56 AM EDT for 4 counties in 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: Apr 16, 2018, 3:56 AM EDT (07:56 UTC)
Expired: Apr 16, 2018, 4:20 AM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 07:57 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 00:00Z, 7.9 hours before the alert went out and 102 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 576 m²/s²
0-3 km storm-relative helicity: 680 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

644 
WUUS51 KPHI 160756
SVRPHI
MDC015-029-035-041-160845-
/O.NEW.KPHI.SV.W.0002.180416T0756Z-180416T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
356 AM EDT MON APR 16 2018

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Talbot County in eastern Maryland...
  Queen Anne's County in northeastern Maryland...
  Kent County in northeastern Maryland...
  Central Cecil County in northeastern Maryland...

* Until 445 AM EDT

* At 356 AM EDT, severe thunderstorms were located along a line
  extending from near Severn River to Kent Point, moving northeast at
  50 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Havre De Grace, Centerville, Talbot, Chestertown, Centreville,
  Romancoke, Rock Hall, St. Michaels, Church Hill, Sudlersville,
  Betterton, Old Town, Grasonville, Newtown, Morgnec, Crumpton,
  Stevensville, Woodlawn, Langford and Chester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 3902 7632 3900 7617 3903 7624 3917 7628
      3932 7618 3943 7600 3962 7615 3970 7611
      3919 7583 3867 7634 3867 7635 3883 7630
      3883 7619 3886 7626 3886 7621 3897 7625
      3891 7624 3884 7637 3885 7637
TIME...MOT...LOC 0756Z 205DEG 42KT 3898 7641 3885 7634 

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

SFJ

2 follow-up statements

098 
WWUS51 KPHI 160806
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
406 AM EDT MON APR 16 2018

MDC015-029-035-041-160845-
/O.CON.KPHI.SV.W.0002.000000T0000Z-180416T0845Z/
Talbot MD-Queen Anne's MD-Kent MD-Cecil MD-
406 AM EDT MON APR 16 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM EDT
FOR NORTH CENTRAL TALBOT...CENTRAL QUEEN ANNE'S...KENT AND SOUTH
CENTRAL CECIL COUNTIES...

At 406 AM EDT, severe thunderstorms were located along a line
extending from near Gibson Island to Chester, moving northeast at 45
mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Centerville, Chestertown, Centreville, Romancoke, Rock Hall, Church
Hill, Betterton, Old Town, Grasonville, Stevensville, Langford,
Chester, Newtown, Overton, Starkey Corner, Morgnec, Crumpton,
Carville, Kennedyville and Queenstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3902 7632 3900 7617 3903 7624 3917 7628
      3932 7618 3943 7600 3944 7597 3918 7588
      3883 7619 3886 7621 3897 7625 3891 7624
      3884 7637 3885 7637
TIME...MOT...LOC 0806Z 204DEG 41KT 3908 7634 3895 7627 

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

SFJ

811 
WWUS51 KPHI 160820
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
420 AM EDT MON APR 16 2018

MDC015-029-035-041-160830-
/O.CAN.KPHI.SV.W.0002.000000T0000Z-180416T0845Z/
Talbot MD-Queen Anne's MD-Kent MD-Cecil MD-
420 AM EDT MON APR 16 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL TALBOT...CENTRAL
QUEEN ANNE'S...KENT AND SOUTH CENTRAL CECIL COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled.  However gusty winds to 40 
mph are still possible with these thunderstorms.

LAT...LON 3902 7632 3900 7617 3903 7624 3917 7628
      3932 7618 3943 7600 3944 7597 3918 7588
      3883 7619 3886 7621 3897 7625 3891 7624
      3884 7637 3885 7637
TIME...MOT...LOC 0818Z 205DEG 42KT 3921 7626 3908 7619 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 3:45 AM EDT	Special Weather Statement	PHI	Kent, Queen Anne's, Talbot	30 min
Apr 16, 4:23 AM EDT	Special Weather Statement	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	37 min
Apr 16, 4:38 AM EDT	Areal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	4 hr
Apr 16, 4:55 AM EDT	Special Weather Statement	PHI	Caroline, Cecil	50 min
Apr 16, 5:34 AM EDT	Areal Flood Advisory	PHI	Cecil, Kent	4 hr
Apr 16, 12:04 PM EDT	Special Weather Statement	PHI	Cecil	26 min
Apr 16, 1:18 PM EDT	Coastal Flood Advisory	PHI	Cecil, Kent	13 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2018 Every severe thunderstorm warning in 2018

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.