Alert archive / Delaware / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 100, NWS Philadelphia/Mount Holly

July 8, 2014Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2014, 7:47 PM EDT for Kent County, New Castle County, Delaware. It was in force for 58 min. 5 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: Jul 8, 2014, 7:47 PM EDT (23:47 UTC)
Expired: Jul 8, 2014, 8:45 PM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 23:51 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 8, 8:00 PM EDT	TSTM WND DMG	Newark, DE	TREES DOWN ALONG RED MILL RD. TIME ESTIMATED FROM RADAR
Jul 8, 8:06 PM EDT	TSTM WND DMG	Hockessin, DE	TREE BRANCHES REPORTED DOWN WITH A TREE DOWN ON ROUTE 7 IN HOCKESSIN.
Jul 8, 8:06 PM EDT	TSTM WND DMG	Hockessin, DE	TREE BRANCHES REPORTED DOWN WITH A TREE DOWN ROUTE 7 IN HOCKESSIN.
Jul 8, 8:10 PM EDT	TSTM WND DMG	Pike Creek, DE	A FEW TREES DOWN ALONG POLLY DRUMMOND HILL RD. TIME ESTIMATED FROM RADAR
Jul 8, 8:17 PM EDT	TSTM WND GST 51	Wilmington Airport, 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
Jul 8, 5:05 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.8 hours before the alert went out and 51 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: 132 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 1646 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

672 
WUUS51 KPHI 082347
SVRPHI
DEC001-003-090045-
/O.NEW.KPHI.SV.W.0100.140708T2347Z-140709T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
747 PM EDT TUE JUL 8 2014

...THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING
SITUATION...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  KENT COUNTY IN CENTRAL DELAWARE...

* UNTIL 845 PM EDT

* AT 745 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  ATGLEN TO HAVRE DE GRACE TO FORT HOWARD...MOVING EAST AT 55 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS
  OF 70 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NEWARK AND PIKE CREEK AROUND 805 PM EDT...
  NEWPORT AND STANTON AROUND 810 PM EDT...
  WILMINGTON MANOR AND TALLEYVILLE AROUND 815 PM EDT...
  PORT PENN AND DELANEY CORNER AROUND 820 PM EDT...
  GREEN SPRING AROUND 825 PM EDT...
  SMYRNA AND HARTLY AROUND 830 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS AN UNUSUALLY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A
STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

THIS LINE OF SEVERE THUNDERSTORMS HAS A HISTORY OF PRODUCING WIND 
DAMAGE AS IT MOVED THROUGH MARYLAND.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR NORTHEAST NEW JERSEY.

&&

LAT...LON 3972 7579 3982 7567 3984 7551 3979 7541
      3962 7560 3959 7559 3964 7557 3951 7555
      3947 7558 3927 7540 3906 7540 3901 7532
      3894 7530 3896 7539 3892 7541 3891 7548
      3884 7556 3883 7572
TIME...MOT...LOC 2347Z 269DEG 47KT 3996 7595 3956 7610
          3917 7642

$$

FORECASTER: AMC

1 follow-up statement

060 
WWUS51 KPHI 090040
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
840 PM EDT TUE JUL 8 2014

DEC001-003-090045-
/O.CON.KPHI.SV.W.0100.000000T0000Z-140709T0045Z/
NEW CASTLE DE-KENT DE-
840 PM EDT TUE JUL 8 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR KENT AND NEW CASTLE COUNTIES...

AT 836 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 8 MILES NORTHEAST OF CLAYMONT TO 10 MILES SOUTHWEST OF
SANDTOWN...OR ALONG A LINE EXTENDING FROM 11 MILES WEST OF GLOUCESTER
CITY TO 11 MILES SOUTHEAST OF CENTERVILLE...MOVING EAST AT 35 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SANDTOWN...CHESWOLD...HAZLETTVILLE AND WOODLAND BEACH BY 845 PM
  EDT...

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
MARYLAND AND NORTHERN DELAWARE. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS.

WIND DAMAGE WITH THESE STORMS CAN OCCUR WELL AHEAD OF ANY RAIN 
OR LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING 
COVER. SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY 
AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR NORTHEAST NEW JERSEY.

LAT...LON 3972 7579 3982 7567 3984 7551 3979 7541
      3962 7560 3959 7559 3964 7557 3951 7555
      3947 7558 3927 7540 3906 7540 3901 7532
      3894 7530 3896 7539 3892 7541 3891 7548
      3884 7556 3883 7572
TIME...MOT...LOC 0039Z 289DEG 31KT 3985 7530 3896 7585

$$

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 2:08 PM EDT	Heat Advisory	PHI	New Castle	4 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2014 Every severe thunderstorm warning in 2014

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.