Alert archive / Delaware / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 96, NWS Philadelphia/Mount Holly

July 9, 2015Kent County, Sussex County, Delaware; Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2015, 8:15 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Maryland. It was in force for 45 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: Jul 9, 2015, 8:15 PM EDT (00:15 UTC)
Expired: Jul 9, 2015, 9:00 PM EDT
In force: 45 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, Sussex County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 25 km from the middle of the area, began a volume at 00:16 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
Jul 9, 8:30 PM EDT	TSTM WND DMG	Woodside, DE	A LARGE NUMBER OF TREES DOWN ALONG ROUTE 13 FROM WOODSIDE TO GREENWOOD. TIME ESTIMATED FROM RADAR.

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
Jul 9, 4:57 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.3 hours before the alert went out and 125 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: 809 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1310 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

042 
WUUS51 KPHI 100015
SVRPHI
DEC001-005-MDC011-100100-
/O.NEW.KPHI.SV.W.0096.150710T0015Z-150710T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
815 PM EDT THU JUL 9 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
  KENT COUNTY IN CENTRAL DELAWARE...
  EAST CENTRAL CAROLINE COUNTY IN EASTERN MARYLAND...

* UNTIL 900 PM EDT

* AT 814 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
  CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE  
  STORMS WERE LOCATED OVER GOLDSBORO...OR 13 MILES EAST OF
  CENTERVILLE...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DOVER...MILFORD...DENTON...HARRINGTON...CAMDEN...CHESWOLD...
  ELLENDALE...BOWERS...WOODSIDE...VIOLA...ANDREWSVILLE...RISING
  SUN...HAZLETTVILLE...DOVER SPEEDWAY...DOVER BASE HOUSING...
  SANDTOWN...RISING SUN-LEBANON...BIG STONE BEACH...WYOMING AND
  FELTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DEADLY LIGHTNING AND 
VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON 
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS 
QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3879 7591 3926 7556 3931 7552 3931 7543
      3925 7540 3921 7540 3915 7541 3907 7541
      3901 7533 3898 7531 3894 7531 3891 7530
      3876 7540
TIME...MOT...LOC 0014Z 273DEG 43KT 3903 7582 

$$

FRANCK/GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:23 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	22 min
Jul 9, 9:01 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	44 min
Jul 9, 9:45 PM EDT	Special Weather Statement	PHI	Sussex	30 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2015 Severe Thunderstorm Warnings in Maryland, 2015 Every severe thunderstorm warning in 2015

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.