Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1561

June 30, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2003, 3:13 PM CDT for 4 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2003, 3:13 PM CDT (20:13 UTC)
Expired: Jun 30, 2003, 4:45 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 45 counties

Baldwin County, AL, Escambia County, AL, Mobile County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wilkinson County, MS

The radar

The Mobile radar (KMOB), 42 km from the middle of the area, began a volume at 20:16 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.

Tornado Watch 608Jun 30, 3:35 PM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.2 hours before the alert went out and 106 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: 124 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 203 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 30, 6:55 AM CDT	Tornado Watch	SPC	Baldwin, Clarke, Mobile, Washington	9 hr
Jun 30, 9:57 AM CDT	Mesoscale Discussion	SPC	Conecuh, Covington, Escambia, Monroe	93 min
Jun 30, 10:30 AM CDT	Tornado Watch	SPC	Baldwin, Escambia	6 hr
Jun 30, 11:23 AM CDT	Mesoscale Discussion	SPC	Mobile, Washington	2 hr
Jun 30, 1:46 PM CDT	Mesoscale Discussion	SPC	Baldwin, Escambia	119 min
Jun 30, 3:35 PM CDT	Tornado Watch	SPC	Baldwin, Escambia, Mobile	6 hr
Jun 30, 4:46 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Mississippi, 2003 Mesoscale Discussions in Alabama, 2003 Every mesoscale discussion in 2003

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.