Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 1707

July 16, 2004Choctaw County, Sumter County, Washington County, Alabama; Washington Parish, Louisiana; 39 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 16, 2004, 11:42 AM CDT for Choctaw County, Sumter County, Washington County, Alabama; Washington Parish, Louisiana; 39 counties in Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 16, 2004, 11:42 AM CDT (16:42 UTC)
Expired
Jul 16, 2004, 2:45 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 43 counties

Choctaw County, AL, Sumter County, AL, Washington County, AL, Washington Parish, LA, Attala County, MS, Calhoun County, MS, Carroll County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Grenada County, MS, Holmes County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pearl River County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Webster County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 63 km from the middle of the area, began a volume at 16:42 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, 4.7 hours before the alert went out and 72 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 2004-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3154 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 2004-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.193958Sfc1 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
3154 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

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
Jul 15, 7:34 PM CDTMesoscale DiscussionSPCButler, Choctaw, Clarke, Coffee, Conecuh, Covington and 12 more86 min
Jul 15, 8:01 PM CDTMesoscale DiscussionSPCCaldwell, Claiborne, Jackson, Lincoln, Ouachita, Union119 min
Jul 16, 12:23 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more97 min
Jul 16, 12:45 PM CDTSevere Thunderstorm WatchSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Madison and 5 more6 hr
Jul 16, 3:03 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 4 more117 min
Jul 16, 6:44 PM CDTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Madison and 5 more61 min
Jul 16, 8:35 AM CDTSevere Thunderstorm WatchSPCBolivar, Coahoma, Sunflower4 hr

Nearby

Mesoscale Discussions in Mississippi, 2004Mesoscale Discussions in Alabama, 2004Mesoscale Discussions in Louisiana, 2004Every mesoscale discussion in 2004

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.