Alert archive / Alabama / Mesoscale Discussions in 2004

Mesoscale Discussion 1431

June 27, 200412 counties in Alabama; Holmes County, Florida

The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2004, 11:30 AM CDT for 12 counties in Alabama; Holmes County, Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 27, 2004, 11:30 AM CDT (16:30 UTC)
Expired: Jun 27, 2004, 1:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Holmes County, FL

The radar

The Mobile radar (KMOB), 127 km from the middle of the area, began a volume at 16:32 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 525Jun 27, 2:35 PM CDT

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 4.5 hours before the alert went out and 204 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: 1009 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 555 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

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 27, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	Bibb, Choctaw, Clarke, Dallas, Greene, Hale and 6 more	5 hr
Jun 27, 5:31 PM CDT	Mesoscale Discussion	SPC	Bibb, Choctaw, Clarke, Dallas, Greene, Hale and 6 more	89 min

Nearby

Mesoscale Discussions in Alabama, 2004 Mesoscale Discussions in Florida, 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.