Alert archive / Pennsylvania / Mesoscale Discussions in 2006

Mesoscale Discussion 1413

July 2, 20067 states

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2006, 3:45 PM EDT for 7 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 2, 2006, 3:45 PM EDT (19:45 UTC)
Expired: Jul 2, 2006, 4:45 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

All 96 counties

Kent County, DE, New Castle County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Talbot County, MD, Washington County, MD, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Adams County, PA, Bedford County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Mifflin County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Frederick County, VA, Loudoun County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 149 km from the middle of the area, began a volume at 19:49 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 573Jul 2, 4:05 PM EDT

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.8 hours before the alert went out and 147 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: 555 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 143 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.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 2, 11:19 AM EDT	Mesoscale Discussion	SPC		86 min
Jul 2, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	Northwest Hills Planning Region	7 hr
Jul 2, 4:03 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region	5 hr
Jul 2, 5:53 PM EDT	Severe Thunderstorm Watch	SPC	Capitol Planning Region, Northeastern Connecticut Planning Region	4 hr
Jul 2, 6:43 PM EDT	Mesoscale Discussion	SPC		92 min
Jul 2, 7:48 PM EDT	Mesoscale Discussion	SPC		87 min
Jul 2, 3:28 PM EDT	Mesoscale Discussion	SPC	Armstrong, Blair, Cambria, Centre, Clearfield, Clinton and 15 more	92 min
Jul 2, 6:58 PM EDT	Severe Thunderstorm Watch	SPC	Brooke, Hancock, Marshall, Ohio, Wetzel	6 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2006 Mesoscale Discussions in New Jersey, 2006 Mesoscale Discussions in Maryland, 2006 Every mesoscale discussion in 2006

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.