Alert archive / Delaware / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 37, NWS Philadelphia/Mount Holly

May 2, 2016Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 2, 2016, 10:59 PM EDT for Sussex County, Delaware. It was in force for 22 min. 1 report 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: May 2, 2016, 10:59 PM EDT (02:59 UTC)
Expired: May 2, 2016, 11:21 PM EDT
In force: 22 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 28 km from the middle of the area, began a volume at 02:59 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
May 2, 11:10 PM EDT	HAIL 0.88	Lewes, DE	DIME TO NICKEL SIZE HAIL IN LEWES. TIME ESTIMATED BY RADAR DATA.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 3.0 hours before the alert went out and 97 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: 851 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

610 
WUUS51 KPHI 030259
SVRPHI
DEC005-030345-
/O.NEW.KPHI.SV.W.0037.160503T0259Z-160503T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1059 PM EDT MON MAY 2 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 1145 PM EDT

* AT 1059 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES NORTHEAST
  OF MILLSBORO...OR 10 MILES EAST OF GEORGETOWN...MOVING NORTHEAST AT
  45 MPH.

  HAZARD...60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  MILLSBORO...LEWES...HENLOPEN ACRES...CAPE HENLOPEN STATE PARK...LONG
  NECK AND DEWEY BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 3862 7535 3885 7522 3879 7514 3880 7510
      3880 7509 3894 7498 3893 7496 3892 7498
      3881 7508 3866 7506 3853 7515
TIME...MOT...LOC 0259Z 210DEG 38KT 3866 7520 

HAIL...1.25IN
WIND...60MPH
 
$$

NIERENBERG

1 follow-up statement

934 
WWUS51 KPHI 030321
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1121 PM EDT MON MAY 2 2016

DEC005-030330-
/O.CAN.KPHI.SV.W.0037.000000T0000Z-160503T0345Z/
SUSSEX DE-
1121 PM EDT MON MAY 2 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX COUNTY IS
CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3862 7535 3885 7522 3879 7514 3880 7510
      3880 7509 3894 7498 3893 7496 3892 7498
      3881 7508 3866 7506 3853 7515
TIME...MOT...LOC 0320Z 210DEG 38KT 3886 7505 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 2, 9:43 PM EDT	Special Weather Statement	PHI	Kent	77 min
May 2, 10:15 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	60 min
May 2, 10:22 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
May 2, 10:45 PM EDT	Flash Flood Warning	PHI	Kent, Sussex	6 hr
May 3, 12:11 AM EDT	Areal Flood Advisory	PHI	Sussex	4 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2016 Every severe thunderstorm warning in 2016

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.