Alert archive / Alabama / Mesoscale Discussions in 2019

Mesoscale Discussion 2148

November 12, 20194 states

The Storm Prediction Center issued this mesoscale discussion at Nov 12, 2019, 2:25 AM CST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Nov 12, 2019, 2:25 AM CST (08:25 UTC)
Expired
Nov 12, 2019, 6:30 AM CST
In force
4 hr
Issued by
the Storm Prediction Center
All 26 counties

Blount County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Dade County, GA, Walker County, GA, Kemper County, MS, Lowndes County, MS, Neshoba County, MS, Noxubee County, MS, Bledsoe County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 102 km from the middle of the area, began a volume at 08:26 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

Nashville Metro, TN (KBNA), launched 00:00Z, 8.4 hours before the alert went out and 212 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, Nashville Metro, TN at 00:00Z on 2019-11-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Nashville Metro, TN at 00:00Z on 2019-11-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
603 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

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