Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 150

February 13, 20074 counties in Alabama; Desha County, Phillips County, Arkansas; 31 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 13, 2007, 11:03 AM CST for 4 counties in Alabama; Desha County, Phillips County, Arkansas; 31 counties in Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Feb 13, 2007, 11:03 AM CST (17:03 UTC)
Expired
Feb 13, 2007, 12:30 PM CST
In force
87 min
Issued by
the Storm Prediction Center
All 37 counties

Colbert County, AL, Franklin County, AL, Lamar County, AL, Marion County, AL, Desha County, AR, Phillips County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS

The radar

The Memphis radar (KNQA), 116 km from the middle of the area, began a volume at 17:07 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.1 hours before the alert went out and 227 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 2007-02-13Temperature 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, Jackson, MS at 12:00Z on 2007-02-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 267 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
4 J/kg
Mixed-layer CIN
-326 J/kg
Mixed-layer LCL
840 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
267 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Feb 13, 2:05 AM CSTMesoscale DiscussionSPCMobile, Washington55 min
Feb 13, 2:43 AM CSTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more10 hr
Feb 13, 4:50 AM CSTMesoscale DiscussionSPCDallas, Greene, Hale, Marengo, Perry, Sumter85 min
Feb 13, 5:26 AM CSTMesoscale DiscussionSPCMobile, Washington94 min
Feb 13, 7:24 AM CSTMesoscale DiscussionSPCBaldwin, Conecuh, Escambia, Mobile, Monroe96 min
Feb 13, 9:07 AM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston7 hr
Feb 13, 12:08 PM CSTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston67 min
Feb 13, 12:49 PM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Chilton, Colbert, Cullman and 21 more6 hr
Feb 13, 5:09 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Butler, Chilton and 21 more96 min
Feb 13, 5:18 PM CSTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 29 more4 hr
Feb 12, 9:38 PM CSTMesoscale DiscussionSPCWilkinson97 min

Nearby

Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Arkansas, 2007Every mesoscale discussion in 2007

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.