Alert archive / Alabama / Mesoscale Discussions in 2019

Mesoscale Discussion 29

January 19, 201925 counties in Alabama; Escambia County, Santa Rosa County, Florida; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 19, 2019, 11:37 AM CST for 25 counties in Alabama; Escambia County, Santa Rosa County, Florida; 7 counties in Mississippi. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jan 19, 2019, 11:37 AM CST (17:37 UTC)
Expired: Jan 19, 2019, 1:00 PM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 34 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Greene County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Shelby County, AL, Sumter County, AL, Talladega County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 125 km from the middle of the area, began a volume at 17:36 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 3Jan 19, 3:20 PM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 5.6 hours before the alert went out and 187 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: 15 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 531 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 313 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 19, 9:08 AM CST	Mesoscale Discussion	SPC	Bibb, Choctaw, Clarke, Dallas, Greene, Hale and 7 more	2 hr
Jan 19, 9:43 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 25 more	7 hr
Jan 19, 3:21 PM CST	Tornado Watch	SPC	Barbour, Bullock, Chambers, Coffee, Dale, Geneva and 7 more	6 hr
Jan 19, 5:38 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 10 more	97 min
Jan 19, 1:24 AM CST	Mesoscale Discussion	SPC	Adams, Claiborne, Issaquena, Jefferson, Sharkey, Warren	2 hr
Jan 19, 5:04 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 28 more	116 min
Jan 19, 5:23 AM CST	Tornado Watch	SPC	Adams, Amite, Attala, Choctaw, Claiborne, Clarke and 36 more	8 hr

Nearby

Mesoscale Discussions in Alabama, 2019 Mesoscale Discussions in Mississippi, 2019 Mesoscale Discussions in Florida, 2019 Every mesoscale discussion in 2019

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.