Alert archive / Maryland / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 305, NWS Philadelphia/Mount Holly

August 1, 2019Cecil County, Maryland; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2019, 4:41 PM EDT for Cecil County, Maryland; New Castle County, Delaware. It was in force for 21 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: Aug 1, 2019, 4:41 PM EDT (20:41 UTC)
Expired: Aug 1, 2019, 5:02 PM EDT
In force: 21 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 96 km from the middle of the area, began a volume at 20:41 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, 8.7 hours before the alert went out and 169 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: 353 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

985 
WUUS51 KPHI 012041
SVRPHI
DEC003-MDC015-012130-
/O.NEW.KPHI.SV.W.0305.190801T2041Z-190801T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
441 PM EDT Thu Aug 1 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Northeastern Cecil County in northeastern Maryland...

* Until 530 PM EDT.

* At 440 PM EDT, a severe thunderstorm was located over Stanton, or
  near Newark, moving south at 10 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Wilmington, Newark, Elkton, Elsmere, New Castle, Delaware City,
  Newport, Barksdale, Stanton, North Star, Glasgow, Bear, Brantwood,
  Wilmington Manor, Pike Creek, Fair Hill, Glen Westover, Saint
  Georges, Greenville and Andora.

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 3972 7583 3972 7577 3975 7576 3981 7557
      3972 7549 3972 7552 3967 7555 3962 7561
      3959 7561 3957 7557 3954 7557 3952 7582
      3970 7590
TIME...MOT...LOC 2040Z 341DEG 10KT 3968 7567 

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

Gorse

1 follow-up statement

831 
WWUS51 KPHI 012102
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
502 PM EDT Thu Aug 1 2019

DEC003-MDC015-012112-
/O.CAN.KPHI.SV.W.0305.000000T0000Z-190801T2130Z/
New Castle DE-Cecil MD-
502 PM EDT Thu Aug 1 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE AND
NORTHEASTERN CECIL COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 3972 7583 3972 7577 3975 7576 3981 7557
      3972 7549 3972 7552 3967 7555 3962 7561
      3959 7561 3957 7557 3954 7557 3952 7582
      3970 7590
TIME...MOT...LOC 2100Z 341DEG 10KT 3962 7564 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:00 PM EDT	Special Weather Statement	PHI	Kent	30 min
Jul 31, 8:13 PM EDT	Special Weather Statement	PHI	Queen Anne's	32 min
Jul 31, 8:47 PM EDT	Special Weather Statement	PHI	Caroline	28 min
Aug 1, 4:02 PM EDT	Severe Thunderstorm Warning	PHI	Cecil	45 min
Aug 1, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	54 min
Aug 1, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's	50 min
Jul 31, 8:39 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Jul 31, 8:48 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jul 31, 9:18 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Aug 1, 2:43 PM EDT	Special Weather Statement	PHI	Kent	47 min
Aug 1, 3:02 PM EDT	Coastal Flood Advisory	PHI	Kent, New Castle, Sussex	12 hr
Aug 1, 3:39 PM EDT	Special Weather Statement	PHI	Kent	51 min
Aug 1, 3:51 PM EDT	Special Weather Statement	PHI	Kent	39 min
Aug 1, 4:00 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	60 min
Aug 1, 4:11 PM EDT	Special Weather Statement	PHI	New Castle	34 min
Aug 1, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	47 min
Aug 1, 6:16 PM EDT	Special Weather Statement	PHI	Sussex	14 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2019 Severe Thunderstorm Warnings in Delaware, 2019 Every severe thunderstorm warning in 2019

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.