Alert archive / Delaware / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly

January 11, 2014Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jan 11, 2014, 4:15 PM EST for Kent County, Sussex County, Delaware. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jan 11, 2014, 4:15 PM EST (21:15 UTC)
Expired: Jan 11, 2014, 4:45 PM EST
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 12 km from the middle of the area, began a volume at 21:18 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.3 hours before the alert went out and 107 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: 536 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 210 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.

725 
WUUS51 KPHI 112115
SVRPHI
DEC001-005-112145-
/O.NEW.KPHI.SV.W.0001.140111T2115Z-140111T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
415 PM EST SAT JAN 11 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 445 PM EST

* AT 414 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR MILFORD...MOVING NORTHEAST
  AT 80 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SLAUGHTER BEACH AND BIG STONE BEACH AROUND 420 PM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.

&&

LAT...LON 3870 7530 3888 7554 3905 7537 3903 7534
      3898 7530 3893 7530 3893 7532 3892 7530
      3878 7515
TIME...MOT...LOC 2115Z 221DEG 68KT 3888 7540

$$

MEOLA

1 follow-up statement

720 
WWUS51 KPHI 112136
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
436 PM EST SAT JAN 11 2014

DEC001-005-112146-
/O.CAN.KPHI.SV.W.0001.000000T0000Z-140111T2145Z/
KENT DE-SUSSEX DE-
436 PM EST SAT JAN 11 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SUSSEX AND
SOUTHEASTERN KENT 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.

LAT...LON 3870 7530 3888 7554 3905 7537 3903 7534
      3898 7530 3893 7530 3893 7532 3892 7530
      3878 7515
TIME...MOT...LOC 2136Z 221DEG 68KT 3918 7506

$$

MEOLA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 11, 2:30 PM EST	Special Weather Statement	PHI	New Castle	90 min
Jan 11, 2:40 PM EST	Special Weather Statement	PHI	Kent, Sussex	2 hr
Jan 11, 2:52 PM EST	Areal Flood Advisory	PHI	New Castle	6 hr
Jan 11, 3:27 PM EST	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Jan 11, 3:59 PM EST	Special Weather Statement	PHI	Kent, Sussex	91 min
Jan 11, 4:04 PM EST	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.