Alert archive / Alabama / Mesoscale Discussions in 2018

Mesoscale Discussion 193

March 28, 20187 counties in Alabama; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2018, 8:27 PM CDT for 7 counties in Alabama; 7 counties in Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Mar 28, 2018, 8:27 PM CDT (01:27 UTC)
Expired
Mar 28, 2018, 10:00 PM CDT
In force
93 min
Issued by
the Storm Prediction Center

Counties Colbert County, AL, Franklin County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Marion County, AL, Winston County, AL, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Lee County, MS, Monroe County, MS, Oktibbeha County, MS

The radar

The Columbus AFB radar (KGWX), 25 km from the middle of the area, began a volume at 01:26 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

Little Rock, AR (KBYH), launched 00:00Z, 1.5 hours before the alert went out and 174 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, Little Rock, AR at 00:00Z on 2018-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, Little Rock, AR at 00:00Z on 2018-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
4 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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.

IssuedProductOfficeCountiesLasted
Mar 29, 12:30 PM CDTMesoscale DiscussionSPCBaldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more2 hr

Nearby

Mesoscale Discussions in Alabama, 2018Mesoscale Discussions in Mississippi, 2018Every mesoscale discussion in 2018

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.