Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 218, NWS Philadelphia/Mount Holly

August 10, 2008Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 10, 2008, 12:03 PM EDT for Sussex County, Delaware. It was in force for 57 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: Aug 10, 2008, 12:03 PM EDT (16:03 UTC)
Expired: Aug 10, 2008, 1:00 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 33 km from the middle of the area, began a volume at 16:04 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
Aug 10, 12:08 PM EDT	FUNNEL CLOUD	Millsboro, DE
Aug 10, 12:20 PM EDT	HAIL 0.25	Rehoboth Beach, DE
Aug 10, 12:27 PM EDT	HAIL 0.88	Rehoboth Beach, 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
Aug 10, 10:46 AM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.1 hours before the alert went out and 83 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: 2296 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 709 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 101603
SVRPHI
DEC005-101700-
/O.NEW.KPHI.SV.W.0218.080810T1603Z-080810T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1203 PM EDT SUN AUG 10 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 100 PM EDT

* AT 1159 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR SELBYVILLE...OR ABOUT 18 MILES SOUTHEAST OF
  GEORGETOWN...AND MOVING NORTHEAST AT 42 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BETHANY BEACH BY 1210 PM...
  8 MILES SOUTHEAST OF REHOBOTH BEACH BY 1220 PM...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM SUNDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

LAT...LON 3865 7540 3880 7514 3879 7511 3881 7509
      3879 7507 3872 7507 3866 7505 3864 7506
      3860 7504 3857 7505 3846 7503 3845 7505
      3845 7534
TIME...MOT...LOC 1603Z 227DEG 36KT 3851 7515

$$

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 10:21 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	54 min
Aug 10, 11:46 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
Aug 10, 12:09 PM EDT	Tornado Warning	PHI	New Castle	36 min
Aug 10, 12:40 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	95 min
Aug 10, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	75 min
Aug 10, 5:59 PM EDT	Areal Flood Advisory	PHI	New Castle	2 hr
Aug 10, 6:36 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	69 min
Aug 10, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	66 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2008 Every severe thunderstorm warning in 2008

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.