Alert archive / Delaware / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 115, NWS Philadelphia/Mount Holly

July 9, 2014Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2014, 7:54 PM EDT for Sussex County, Delaware. It was in force for 44 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: Jul 9, 2014, 7:54 PM EDT (23:54 UTC)
Expired: Jul 9, 2014, 8:38 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 31 km from the middle of the area, began a volume at 23:56 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, 11.9 hours before the alert went out and 71 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: 559 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

831 
WUUS51 KPHI 092354
SVRPHI
DEC005-100115-
/O.NEW.KPHI.SV.W.0115.140709T2354Z-140710T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
754 PM EDT WED JUL 9 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 915 PM EDT

* AT 749 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  LINKWOOD TO MARDELA SPRINGS TO ANDREWS...MOVING EAST AT 30 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
  60 MPH AND HAIL AS LARGE AS QUARTERS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SEAFORD AROUND 820 PM EDT...
  LAUREL AND DELMAR AROUND 825 PM EDT...
  SYCAMORE AROUND 830 PM EDT...
  GUMBORO AROUND 845 PM EDT...
  MILLSBORO AROUND 850 PM EDT...
  DAGSBORO AROUND 855 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS LINE OF
SEVERE THUNDERSTORMS. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM...AND
THE STORM WILL AFFECT THE BEACHES. FOR YOUR SAFETY...DO NOT HESITATE
TO LEAVE THE BEACH AND SEEK SHELTER INDOORS.
 
&&

LAT...LON 3846 7569 3846 7570 3867 7571 3869 7513
      3870 7510 3869 7509 3870 7507 3860 7504
      3859 7505 3845 7504 3845 7505 3845 7552
TIME...MOT...LOC 2353Z 277DEG 28KT 3853 7589 3838 7579
          3816 7597

$$

TFG

1 follow-up statement

116 
WWUS51 KPHI 100038
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
838 PM EDT WED JUL 9 2014

DEC005-100048-
/O.CAN.KPHI.SV.W.0115.000000T0000Z-140710T0115Z/
SUSSEX DE-
838 PM EDT WED JUL 9 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SUSSEX COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS.  SOME HEAVY DOWNPOURS
AND CLOUD TO GROUND LIGHTNING WILL BE CONTINUING DURING THE NEXT HOUR.

LAT...LON 3846 7569 3846 7570 3867 7571 3869 7513
      3870 7510 3869 7509 3870 7507 3860 7504
      3859 7505 3845 7504 3845 7505 3845 7552
TIME...MOT...LOC 0038Z 277DEG 28KT 3849 7545 3834 7535
          3812 7553

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:47 PM EDT	Special Weather Statement	PHI	Kent, New Castle	58 min
Jul 9, 7:37 PM EDT	Special Weather Statement	PHI	Sussex	83 min

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.