Alert archive / Maryland / Mesoscale Discussions in 2004

Mesoscale Discussion 1419

June 25, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2004, 4:14 PM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 25, 2004, 4:14 PM EDT (20:14 UTC)
Expired: Jun 25, 2004, 6:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 22 counties

New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Gloucester County, NJ, Salem County, NJ, Adams County, PA, Berks County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Montgomery County, PA, Philadelphia County, PA, York County, PA

The radar

The Sterling radar (KLWX), 100 km from the middle of the area, began a volume at 20:14 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 97 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: 375 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1108 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

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
Jun 25, 1:08 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	2 hr
Jun 25, 1:45 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle	7 hr
Jun 24, 8:10 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 26 more	5 hr
Jun 24, 10:28 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 23 more	2 hr

Nearby

Mesoscale Discussions in Maryland, 2004 Mesoscale Discussions in Pennsylvania, 2004 Mesoscale Discussions in New Jersey, 2004 Every mesoscale discussion in 2004

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.