Alert archive / Mississippi / Mesoscale Discussions in 2009

Mesoscale Discussion 258

March 25, 2009Choctaw County, Washington County, Alabama; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2009, 12:08 PM CDT for Choctaw County, Washington County, Alabama; 8 counties in Mississippi. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Mar 25, 2009, 12:08 PM CDT (17:08 UTC)
Expired
Mar 25, 2009, 1:15 PM CDT
In force
67 min
Issued by
the Storm Prediction Center

Counties Choctaw County, AL, Washington County, AL, Forrest County, MS, Greene County, MS, Jones County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 103 km from the middle of the area, began a volume at 17:10 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 12:00Z, 5.1 hours before the alert went out and 153 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 12:00Z on 2009-03-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 422 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, Jackson, MS at 12:00Z on 2009-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 435 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
422 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
535 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
435 m²/s²
0-3 km storm-relative helicity
539 m²/s²
Significant tornado parameter
1.1
Supercell composite
4.0

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.

IssuedProductOfficeCountiesLasted
Mar 25, 2:20 AM CDTMesoscale DiscussionSPCAdams, Claiborne, Jefferson, Warren85 min

Nearby

Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Alabama, 2009Every mesoscale discussion in 2009

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.