Alert archive / Delaware / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 407, NWS Philadelphia/Mount Holly

October 31, 2019Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 31, 2019, 11:28 PM EDT for Kent County, New Castle County, Delaware. It was in force for 62 min. 4 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: Oct 31, 2019, 11:28 PM EDT (03:28 UTC)
Expired: Nov 1, 2019, 12:30 AM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE

The radar

The Dover AFB radar (KDOX), 45 km from the middle of the area, began a volume at 03:31 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
Oct 31, 11:28 PM EDT	TSTM WND DMG	Middletown, DE	TREES DOWN, HOMES DAMAGED. TIME ESTIMATED FROM RADAR.
Oct 31, 11:35 PM EDT	TSTM WND GST 62	1 S Odessa, DE	DEDOT GAUGE.
Oct 31, 11:49 PM EDT	TSTM WND DMG	2 Se Smyrna Landing, DE	DOWNED TREE ON SMYRNA LEIPSIC ROAD BETWEEN BIG OAK ROAD AND HURD ROAD. TIME ESTIMATED FROM RADAR.
Nov 1, 12:02 AM EDT	TSTM WND GST 59	3 Ssw Little Creek, DE

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Oct 31, 7:56 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.5 hours before the alert went out and 144 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: 9 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 933 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 262 m²/s²
0-3 km storm-relative helicity: 301 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

698 
WUUS51 KPHI 010328
SVRPHI
DEC001-003-010430-
/O.NEW.KPHI.SV.W.0407.191101T0328Z-191101T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1128 PM EDT Thu Oct 31 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern New Castle County in northern Delaware...
  Kent County in central Delaware...

* Until 1230 AM EDT.

* At 1128 PM EDT, severe thunderstorms were located along a line
  extending from near Saint Georges to near St. Michaels, moving
  northeast at 65 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Dover, Middletown, Smyrna, Milford, Harrington, Camden, Clayton,
  Cheswold, Bowers, Woodside, Viola, Hartly, Rising Sun-Lebanon,
  Woodland Beach, Hazlettville, Port Penn, Delaney Corner, Dover Base
  Housing, Dover Speedway and Sandtown.

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.

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 3954 7578 3952 7553 3950 7552 3951 7548
      3949 7552 3950 7554 3946 7554 3943 7545
      3939 7542 3887 7522 3887 7526 3895 7532
      3896 7539 3892 7541 3890 7549 3884 7555
      3884 7572
TIME...MOT...LOC 0328Z 239DEG 56KT 3952 7565 3882 7623 

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

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 31, 11:15 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	60 min
Nov 1, 12:10 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	95 min
Nov 1, 9:12 AM EDT	Freeze Warning	PHI	Kent, New Castle, Sussex	25 hr

Nearby

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