Alert archive / Maryland / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 123, NWS Philadelphia/Mount Holly

November 18, 20135 counties in Maryland; Kent County, New Castle County, Delaware; Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 18, 2013, 2:46 AM EST for 5 counties in Maryland; Kent County, New Castle County, Delaware; Salem County, New Jersey. It was in force for 59 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, 2:46 AM EST (07:46 UTC)
Expired
Nov 18, 2013, 3:45 AM EST
In force
59 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 62 km from the middle of the area, began a volume at 07:47 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

TimeReportWhereRemark
Nov 18, 3:09 AM ESTTSTM WND DMGNewark, DEWIRES REPORTED DOWN.
Nov 18, 3:22 AM ESTTSTM WND GST 50Saint Georges, DEC AND D CANAL BRIDGE
Nov 18, 3:53 AM ESTTSTM WND DMGEaston, MDTREE DOWN BLOCKING SWANHAVEN ROAD

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.

IssuedProductOfficeLasted
Nov 18, 1:07 AM ESTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.8 hours before the alert went out and 119 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2013-11-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2013-11-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 308 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
697 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
308 m²/s²
0-3 km storm-relative helicity
340 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.

663 
WUUS51 KPHI 180746
SVRPHI
DEC001-003-MDC011-015-029-035-041-NJC033-180845-
/O.NEW.KPHI.SV.W.0123.131118T0746Z-131118T0845Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHWESTERN KENT COUNTY IN CENTRAL DELAWARE...
  CAROLINE COUNTY IN EASTERN MARYLAND...
  QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  WESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN TALBOT COUNTY IN EASTERN MARYLAND...

* UNTIL 345 AM EST

* AT 243 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  RISING SUN TO BOWLEYS QUARTERS TO ANNAPOLIS...MOVING EAST AT 30
  MPH. THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CALVERT AND FARMINGTON AROUND 250 AM EST...
  LOMBARD AND ZION AROUND 255 AM EST...
  BLAKE AND PLEASANT HILL AROUND 300 AM EST...
  ANDORA AND FAIR HILL AROUND 305 AM EST...
  BARKSDALE AND APPLETON AROUND 310 AM EST...
  NEWARK AND CAYOTS AROUND 315 AM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH.

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 500 AM EST MONDAY
MORNING FOR NORTHWEST NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3905 7631 3900 7618 3918 7628 3952 7599
      3972 7623 3972 7538 3945 7553 3959 7556
      3940 7552 3916 7562 3871 7593 3876 7635
      3878 7636 3887 7626 3881 7621 3882 7620
      3894 7624 3884 7639
TIME...MOT...LOC 0745Z 281DEG 28KT 3970 7605 3929 7633
          3896 7664

$$

FORECASTER: HEAVENER
1 follow-up statement
387 
WWUS51 KPHI 180824
SVSPHI

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

DEC001-003-MDC011-015-029-035-041-NJC033-180845-
/O.CON.KPHI.SV.W.0123.000000T0000Z-131118T0845Z/
NEW CASTLE DE-CECIL MD-KENT MD-KENT DE-CAROLINE MD-QUEEN ANNE'S MD-
SALEM NJ-TALBOT MD-
324 AM EST MON NOV 18 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM EST
FOR NORTHERN TALBOT...WESTERN SALEM...QUEEN ANNE'S...NORTHERN
CAROLINE...NORTHWESTERN KENT...KENT...SOUTHEASTERN CECIL AND NEW
CASTLE COUNTIES...

AT 320 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 NEW CASTLE TO SUDLERSVILLE TO TALBOT...MOVING EAST AT
30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
PENNSVILLE AND CARNEYS POINT AROUND 330 AM EST...
TEMPLEVILLE AND SALEM AROUND 335 AM EST...
EASTON AND SMYRNA AROUND 340 AM EST...
GREENSBORO AND GRIFFIN AROUND 345 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.

&&

LAT...LON 3888 7638 3903 7626 3900 7618 3908 7622
      3924 7609 3972 7574 3972 7544 3971 7538
      3945 7553 3940 7552 3916 7562 3884 7584
      3873 7596 3879 7635 3887 7626 3881 7621
      3882 7620 3894 7624 3884 7639
TIME...MOT...LOC 0823Z 281DEG 28KT 3966 7557 3920 7586
          3885 7624

$$

KLINE

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 18, 2:28 AM ESTSevere Thunderstorm WarningPHICecil62 min
Nov 18, 3:39 AM ESTSevere Thunderstorm WarningPHICaroline, Talbot66 min
Nov 18, 3:29 AM ESTSevere Thunderstorm WarningPHINew Castle61 min
Nov 18, 2:54 AM ESTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex, Warren66 min
Nov 18, 3:04 AM ESTSpecial Marine WarningPHI86 min
Nov 18, 3:43 AM ESTSpecial Marine WarningPHI92 min
Nov 18, 4:06 AM ESTSevere Thunderstorm WarningPHIMiddlesex, Somerset24 min
Nov 18, 4:20 AM ESTSpecial Marine WarningPHI85 min
Nov 18, 4:28 AM ESTSpecial Weather StatementPHIAtlantic, Burlington, Monmouth, Ocean32 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2013Severe Thunderstorm Warnings in Delaware, 2013Severe Thunderstorm Warnings in New Jersey, 2013Every 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.