Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 1688

July 15, 20045 states

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2004, 1:12 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 15, 2004, 1:12 PM CDT (18:12 UTC)
Expired
Jul 15, 2004, 3:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 118 counties

Autauga County, AL, Bibb County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Wilcox County, AL, Arkansas County, AR, Ashley County, AR, Benton County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Union County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR, East Carroll Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Tunica County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Adair County, OK, Cherokee County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Little Rock radar (KLZK), 53 km from the middle of the area, began a volume at 18:11 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, 6.2 hours before the alert went out and 292 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 2004-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1539 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 2004-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
1539 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
1273 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 14, 8:16 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 31 more59 min
Jul 15, 10:08 AM CDTMesoscale DiscussionSPCHouston3 hr
Jul 15, 2:20 PM CDTSevere Thunderstorm WatchSPCChoctaw, Mobile, Washington6 hr
Jul 15, 2:55 PM CDTMesoscale DiscussionSPCDale, Geneva, Henry, Houston2 hr
Jul 15, 3:10 PM CDTSevere Thunderstorm WatchSPCBarbour, Coffee, Covington, Crenshaw, Dale, Geneva and 3 more5 hr
Jul 15, 5:18 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 12 more117 min
Jul 14, 7:10 PM CDTSevere Thunderstorm WatchSPCCraighead, Crittenden, Cross, Greene, Lee, Mississippi and 3 more6 hr
Jul 14, 10:41 PM CDTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more94 min
Jul 15, 4:45 PM CDTSevere Thunderstorm WatchSPCBenton, Bradley, Calhoun, Carroll, Clark, Cleveland and 36 more6 hr
Jul 14, 11:38 PM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Clay, Grenada, Holmes and 12 more97 min
Jul 15, 5:04 PM CDTMesoscale DiscussionSPCAlfalfa, Grant, Harper, Woods86 min

Nearby

Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Mississippi, 2004Mesoscale Discussions in Alabama, 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.