Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 2014

August 3, 2008Phillips County, Arkansas; 15 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2008, 3:09 PM CDT for Phillips County, Arkansas; 15 counties in Mississippi. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Aug 3, 2008, 3:09 PM CDT (20:09 UTC)
Expired: Aug 3, 2008, 4:15 PM CDT
In force: 66 min
Issued by: the Storm Prediction Center

Counties Phillips County, AR, Bolivar County, MS, Carroll County, MS, Coahoma County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Leflore County, MS, Montgomery County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS

The radar

The Memphis radar (KNQA), 169 km from the middle of the area, began a volume at 19:59 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 (KLZK), launched 12:00Z, 8.2 hours before the alert went out and 112 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3040 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1333 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.0

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.

Issued	Product	Office	Counties	Lasted
Aug 2, 7:52 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot	6 hr
Aug 2, 10:57 PM CDT	Mesoscale Discussion	SPC	Chicot, Desha	93 min
Aug 3, 4:21 PM CDT	Mesoscale Discussion	SPC	Chicot	54 min
Aug 2, 7:27 PM CDT	Mesoscale Discussion	SPC	Attala, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 21 more	2 hr
Aug 3, 10:50 AM CDT	Mesoscale Discussion	SPC	Adams, Attala, Choctaw, Claiborne, Copiah, Franklin and 12 more	55 min
Aug 3, 1:07 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Claiborne, Copiah, Franklin, Hinds, Issaquena and 9 more	7 hr

Nearby

Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Arkansas, 2008 Every mesoscale discussion in 2008

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.