Alert archive / Tennessee / Mesoscale Discussions in 2019

Mesoscale Discussion 178

March 9, 201912 counties in Alabama; Lowndes County, Mississippi; 13 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 9, 2019, 7:20 PM CST for 12 counties in Alabama; Lowndes County, Mississippi; 13 counties in Tennessee. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Mar 9, 2019, 7:20 PM CST (01:20 UTC)
Expired
Mar 9, 2019, 8:45 PM CST
In force
85 min
Issued by
the Storm Prediction Center
All 26 counties

Colbert County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Pickens County, AL, Walker County, AL, Winston County, AL, Lowndes County, MS, Bedford County, TN, Cannon County, TN, Coffee County, TN, DeKalb County, TN, Giles County, TN, Jackson County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Moore County, TN, Rutherford County, TN, Smith County, TN, Wilson County, TN

The radar

The Columbus AFB radar (KGWX), 107 km from the middle of the area, began a volume at 01:24 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

Birmingham, AL (KBMX), launched 00:00Z, 1.3 hours before the alert went out and 150 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-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2019-03-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 356 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2019-03-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 337 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
356 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
337 m²/s²
0-3 km storm-relative helicity
539 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.0

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Tennessee, 2019Mesoscale Discussions in Alabama, 2019Mesoscale Discussions in Mississippi, 2019Every 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.