Alert archive / Maryland / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 101, NWS Philadelphia/Mount Holly

September 26, 20185 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 26, 2018, 7:16 PM EDT for 5 counties in Maryland. It was in force for 43 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: Sep 26, 2018, 7:16 PM EDT (23:16 UTC)
Expired: Sep 26, 2018, 7:59 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 26, 5:02 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.3 hours before the alert went out and 103 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: 6 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

174 
WUUS51 KPHI 262316
SVRPHI
MDC011-015-029-035-041-270015-
/O.NEW.KPHI.SV.W.0101.180926T2316Z-180927T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
716 PM EDT WED SEP 26 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 815 PM EDT.

* At 716 PM EDT, severe thunderstorms were located along a line
  extending from White Marsh to Lake Shore to Marlton, moving
  southeast at 40 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Easton, Centerville, Talbot, Chestertown, Denton, Centreville,
  Greensboro, Oakland, Ridgely, Rock Hall, Trappe, St. Michaels,
  Church Hill, Preston, Cecilton, Millington, Sudlersville,
  Betterton, Queen Anne and Old Town.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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.

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

&&

LAT...LON 3896 7631 3884 7637 3892 7637 3904 7631
      3898 7628 3899 7620 3900 7617 3901 7622
      3917 7628 3932 7618 3946 7600 3938 7577
      3879 7583 3857 7604 3876 7622 3871 7628
      3878 7629 3877 7632 3867 7634
TIME...MOT...LOC 2316Z 301DEG 34KT 3937 7643 3911 7650 3876 7679 

HAIL...0.75IN
WIND...60MPH
 
$$

MPS

1 follow-up statement

512 
WWUS51 KPHI 262359
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
759 PM EDT WED SEP 26 2018

MDC011-015-029-035-041-270009-
/O.CAN.KPHI.SV.W.0101.000000T0000Z-180927T0015Z/
Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-Cecil MD-
759 PM EDT WED SEP 26 2018

...THE SEVERE THUNDERSTORM WARNING FOR TALBOT...QUEEN ANNE'S...
CENTRAL CAROLINE...KENT AND SOUTHEASTERN 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 and 
heavy rain are still possible with these thunderstorms.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
eastern and northeastern Maryland.

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

LAT...LON 3896 7631 3884 7637 3892 7637 3904 7631
      3898 7628 3899 7620 3900 7617 3901 7622
      3917 7628 3932 7618 3946 7600 3938 7577
      3879 7583 3857 7604 3876 7622 3871 7628
      3878 7629 3877 7632 3867 7634
TIME...MOT...LOC 2355Z 301DEG 34KT 3918 7602 3892 7609 3857 7638 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 26, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent	54 min
Sep 26, 7:31 PM EDT	Areal Flood Advisory	PHI	Cecil	106 min
Sep 26, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	52 min

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.