Alert archive / Delaware / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 126, NWS Philadelphia/Mount Holly

November 18, 2013Kent County, New Castle County, Sussex County, Delaware; Caroline County, Talbot County, Maryland; Atlantic County, Cape May County, Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 18, 2013, 3:39 AM EST for Kent County, New Castle County, Sussex County, Delaware; Caroline County, Talbot County, Maryland; Atlantic County, Cape May County, Cumberland County, New Jersey. It was in force for 66 min. 3 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: Nov 18, 2013, 3:39 AM EST (08:39 UTC)
Expired: Nov 18, 2013, 4:45 AM EST
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Talbot County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ

The radar

The Dover AFB radar (KDOX), 10 km from the middle of the area, began a volume at 08:42 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
Nov 18, 3:53 AM EST	TSTM WND DMG	Easton, MD	TREE DOWN BLOCKING SWANHAVEN ROAD
Nov 18, 4:43 AM EST	MARINE TSTM WIND 42	Lewes, DE
Nov 18, 4:50 AM EST	MARINE TSTM WIND 39	Ocean City, NJ

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
Nov 18, 1:07 AM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 8.7 hours before the alert went out and 109 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 722 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

226 
WUUS51 KPHI 180839
SVRPHI
DEC001-003-005-MDC011-041-NJC001-009-011-180945-
/O.NEW.KPHI.SV.W.0126.131118T0839Z-131118T0945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
339 AM EST MON NOV 18 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  KENT COUNTY IN CENTRAL DELAWARE...
  CAROLINE COUNTY IN EASTERN MARYLAND...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...
  CAPE MAY COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHWESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  TALBOT COUNTY IN EASTERN MARYLAND...

* UNTIL 445 AM EST

* AT 337 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  QUINTON TO SANDTOWN TO EASTON...MOVING EAST AT 45 MPH. THESE STORMS
  ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WOODSIDE AND VIOLA AROUND 345 AM EST...
  BRIDGETON AND FAIRTON AROUND 350 AM EST...
  HARRINGTON AND BOWERS AROUND 355 AM EST...
  SOUTH VINELAND AND MILFORD AROUND 400 AM EST...
  SEAFORD AND BRIDGEVILLE AROUND 405 AM EST...
  CUMBERLAND AND SLAUGHTER BEACH AROUND 410 AM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT
WAIT TO HEAR THUNDER BEFORE TAKING COVER. SEEK SHELTER IMMEDIATELY
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM EST MONDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 3846 7569 3863 7571 3868 7576 3869 7589
      3857 7604 3873 7626 3871 7629 3893 7599
      3892 7595 3911 7574 3944 7556 3936 7548
      3945 7541 3946 7471 3927 7457 3899 7478
      3893 7487 3892 7496 3881 7509 3845 7505
TIME...MOT...LOC 0839Z 290DEG 41KT 3949 7535 3907 7566
          3878 7599

$$

FORECASTER: HEAVENER

2 follow-up statements

277 
WWUS51 KPHI 180925
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
425 AM EST MON NOV 18 2013

DEC003-MDC011-041-180934-
/O.CAN.KPHI.SV.W.0126.000000T0000Z-131118T0945Z/
NEW CASTLE DE-CAROLINE MD-TALBOT MD-
425 AM EST MON NOV 18 2013

...THE SEVERE THUNDERSTORM WARNING FOR TALBOT...CAROLINE AND
SOUTHEASTERN NEW CASTLE COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM EST MONDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 800 AM EST MONDAY MORNING FOR NORTHEAST NEW JERSEY.

LAT...LON 3846 7569 3863 7571 3870 7571 3892 7559
      3923 7505 3946 7488 3946 7471 3927 7457
      3899 7478 3893 7487 3892 7496 3881 7509
      3845 7505
TIME...MOT...LOC 0924Z 290DEG 41KT 3931 7473 3889 7504
          3860 7537

$$

DEC001-005-NJC001-009-011-180945-
/O.CON.KPHI.SV.W.0126.000000T0000Z-131118T0945Z/
KENT DE-SUSSEX DE-CAPE MAY NJ-ATLANTIC NJ-CUMBERLAND NJ-
425 AM EST MON NOV 18 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM EST
FOR SOUTHEASTERN CUMBERLAND...SOUTHWESTERN ATLANTIC...CAPE MAY...
SUSSEX AND SOUTHEASTERN KENT COUNTIES...

AT 422 AM EST...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 CORBIN CITY TO 8 MILES SOUTHWEST OF NORTH CAPE MAY TO
SYCAMORE...MOVING EAST AT 45 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
MILLSBORO AND WHITESBORO-BURLEIGH AROUND 430 AM EST...
REHOBOTH BEACH AND LONG NECK AROUND 435 AM EST...
SELBYVILLE AND MILLVILLE AROUND 440 AM EST...
FENWICK ISLAND AND BETHANY BEACH AROUND 445 AM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM EST MONDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 800 AM EST MONDAY MORNING FOR NORTHEAST NEW JERSEY.

&&

LAT...LON 3846 7569 3863 7571 3870 7571 3892 7559
      3923 7505 3946 7488 3946 7471 3927 7457
      3899 7478 3893 7487 3892 7496 3881 7509
      3845 7505
TIME...MOT...LOC 0924Z 290DEG 41KT 3931 7473 3889 7504
          3860 7537

$$

FORECASTER: HEAVENER

759 
WWUS51 KPHI 180936
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
436 AM EST MON NOV 18 2013

DEC001-005-NJC001-009-011-180946-
/O.EXP.KPHI.SV.W.0126.000000T0000Z-131118T0945Z/
KENT DE-SUSSEX DE-CAPE MAY NJ-ATLANTIC NJ-CUMBERLAND NJ-
436 AM EST MON NOV 18 2013

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CUMBERLAND...
SOUTHWESTERN ATLANTIC...CAPE MAY...SUSSEX AND SOUTHEASTERN KENT
COUNTIES WILL EXPIRE AT 445 AM EST...

THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3846 7569 3863 7571 3870 7571 3892 7559
      3923 7505 3946 7488 3946 7471 3927 7457
      3899 7478 3893 7487 3892 7496 3881 7509
      3845 7505
TIME...MOT...LOC 0936Z 290DEG 41KT 3926 7456 3884 7488
          3855 7521

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 18, 2:28 AM EST	Severe Thunderstorm Warning	PHI	New Castle	62 min
Nov 18, 2:46 AM EST	Severe Thunderstorm Warning	PHI	Kent, New Castle	59 min
Nov 18, 3:29 AM EST	Severe Thunderstorm Warning	PHI	New Castle	61 min
Nov 18, 2:54 AM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	66 min
Nov 18, 3:04 AM EST	Special Marine Warning	PHI		86 min
Nov 18, 3:43 AM EST	Special Marine Warning	PHI		92 min
Nov 18, 4:06 AM EST	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	24 min
Nov 18, 4:20 AM EST	Special Marine Warning	PHI		85 min
Nov 18, 4:28 AM EST	Special Weather Statement	PHI	Atlantic, Burlington, Monmouth, Ocean	32 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2013 Severe Thunderstorm Warnings in New Jersey, 2013 Severe Thunderstorm Warnings in Maryland, 2013 Every severe thunderstorm warning in 2013

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.