Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 875

June 7, 20149 counties in Alabama; 8 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2014, 11:39 AM CDT for 9 counties in Alabama; 8 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 7, 2014, 11:39 AM CDT (16:39 UTC)
Expired: Jun 7, 2014, 1:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Bay County, FL, Escambia County, FL, Franklin County, FL, Gulf County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 110 km from the middle of the area, began a volume at 16:43 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, 4.7 hours before the alert went out and 266 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: 43 J/kg
Mixed-layer CIN: -320 J/kg
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 7, 3:32 PM CDT	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, DeKalb, Etowah, Fayette and 16 more	2 hr
Jun 7, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	Colbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more	5 hr
Jun 6, 8:56 PM CDT	Mesoscale Discussion	SPC	Gadsden, Hamilton, Holmes, Jackson, Jefferson, Leon and 2 more	94 min

Nearby

Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Florida, 2014 Every mesoscale discussion in 2014

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.