Alert archive / Florida / Mesoscale Discussions in 2010

Mesoscale Discussion 39

January 21, 2010Geneva County, Houston County, Alabama; 4 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 21, 2010, 7:57 AM CST for Geneva County, Houston County, Alabama; 4 counties in Florida. It was in force for 33 min.

The area

The outline as issued.

The facts

Issued: Jan 21, 2010, 7:57 AM CST (13:57 UTC)
Expired: Jan 21, 2010, 8:30 AM CST
In force: 33 min
Issued by: the Storm Prediction Center

Counties Geneva County, AL, Houston County, AL, Holmes County, FL, Jackson County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 7 km from the middle of the area, began a volume at 13:58 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 2.0 hours before the alert went out and 161 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: 85 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 654 m²/s²
0-3 km storm-relative helicity: 749 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

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
Jan 20, 8:59 PM CST	Mesoscale Discussion	SPC	Choctaw, Mobile, Washington	91 min
Jan 20, 10:18 PM CST	Mesoscale Discussion	SPC	Coffee, Covington, Escambia, Geneva, Houston	87 min
Jan 21, 1:31 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Butler, Choctaw, Clarke and 22 more	29 min
Jan 21, 2:09 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 25 more	7 hr
Jan 21, 5:44 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 25 more	61 min
Jan 21, 9:55 AM CST	Mesoscale Discussion	SPC	Colbert, Lauderdale	65 min
Jan 21, 12:01 PM CST	Tornado Watch	SPC	Colbert, Franklin, Lauderdale	3 hr
Jan 21, 5:14 PM CST	Mesoscale Discussion	SPC	Jackson, Madison	91 min
Jan 21, 7:12 AM CST	Mesoscale Discussion	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 8 more	33 min
Jan 21, 7:25 AM CST	Tornado Watch	SPC	Alachua, Baker, Bay, Bradford, Calhoun, Clay and 22 more	10 hr
Jan 21, 10:35 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 11 more	55 min
Jan 21, 1:09 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 10 more	66 min

Nearby

Mesoscale Discussions in Florida, 2010 Mesoscale Discussions in Alabama, 2010 Every mesoscale discussion in 2010

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.