Alert archive / Alabama / Mesoscale Discussions in 2013

Mesoscale Discussion 31

January 13, 20136 counties in Alabama; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2013, 6:01 PM CST for 6 counties in Alabama; 5 counties in Mississippi. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jan 13, 2013, 6:01 PM CST (00:01 UTC)
Expired
Jan 13, 2013, 7:30 PM CST
In force
89 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Clarke County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 83 km from the middle of the area, began a volume at 00:01 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

Jackson, MS (KJAN), launched 00:00Z, 0.0 hours before the alert went out and 211 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, Jackson, MS at 00:00Z on 2013-01-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLEL10008507005003002001001 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, Jackson, MS at 00:00Z on 2013-01-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -146 square meters per square second.1939587897Sfc1 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
3 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
458 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
-146 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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.

IssuedProductOfficeCountiesLasted
Jan 13, 6:00 PM CSTMesoscale DiscussionSPCCalhoun, Cherokee, Clay, Cleburne, DeKalb, Etowah and 3 more2 hr
Jan 14, 8:46 AM CSTMesoscale DiscussionSPCBolivar, Carroll, Grenada, Humphreys, Leflore, Sunflower and 3 more4 hr

Nearby

Mesoscale Discussions in Alabama, 2013Mesoscale Discussions in Mississippi, 2013Every mesoscale discussion in 2013

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.