Alert archive / Delaware / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 4, NWS Philadelphia/Mount Holly

March 5, 2008Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 5, 2008, 1:26 AM EST for Sussex County, Delaware. It was in force for 49 min. 5 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: Mar 5, 2008, 1:26 AM EST (06:26 UTC)
Expired: Mar 5, 2008, 2:15 AM EST
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 27 km from the middle of the area, began a volume at 06:27 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
Mar 5, 1:57 AM EST	TSTM WND DMG	8 Ssw Millsboro, DE	WIRES DOWN IN GUMBORO.
Mar 5, 2:06 AM EST	TSTM WND DMG	Georgetown, DE	HANGAR DAMAGED AT SUSSEX COUNTY AIRPORT.
Mar 5, 2:08 AM EST	TSTM WND GST 63	Georgetown, DE	A 63 MPH WIND GUST WAS MEASURED AT THE GEORGETOWN AIRPORT ASSOCIATED WITH A SQUALL LINE.
Mar 5, 2:10 AM EST	TSTM WND DMG	Millsboro, DE	TREES FELL ONTO ROAD.
Mar 5, 2:10 AM EST	TSTM WND DMG	Milton, DE	POLES LEANING AND WIRES DOWN.

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
Mar 5, 1:04 AM EST	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 6.4 hours before the alert went out and 73 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: 11 J/kg
Mixed-layer CIN: -168 J/kg
Mixed-layer LCL: 592 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 050629
SVRPHI
DEC005-050715-
/O.NEW.KPHI.SV.W.0004.080305T0626Z-080305T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
126 AM EST WED MAR 5 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 215 AM EST

* AT 123 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 17 MILES WEST OF
  SEAFORD...OR ABOUT 46 MILES SOUTHWEST OF DOVER...AND MOVING
  NORTHEAST AT 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SEAFORD BY 140 AM EST...
  BRIDGEVILLE BY 145 AM EST...
  ELLENDALE AND 8 MILES NORTHWEST OF MILTON BY 155 AM EST...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM EST
WEDNESDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

LAT...LON 3846 7571 3850 7571 3865 7572 3870 7571
      3890 7528 3861 7513 3860 7515 3860 7512
      3846 7504 3846 7570
TIME...MOT...LOC 0626Z 232DEG 55KT 3859 7587

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 5, 1:44 AM EST	Severe Thunderstorm Warning	PHI	Kent, New Castle	61 min
Mar 5, 2:11 AM EST	Severe Thunderstorm Warning	PHI	Sussex	49 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.