Alert archive / Mississippi / Mesoscale Discussions in 2004
Mesoscale Discussion 504
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2004, 8:58 PM CDT for 34 counties in Mississippi. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2004, 8:58 PM CDT (01:58 UTC)
- Expired
- Apr 29, 2004, 10:00 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 34 counties
Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Itawamba County, MS, Jasper County, MS, Kemper County, MS, Lafayette County, MS, Lauderdale County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Smith County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS
The radar
The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 02:00 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 00:00Z, 2.0 hours before the alert went out and 125 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.
- Mixed-layer CAPE
- 851 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 851 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 7:51 PM CDT | Mesoscale Discussion | SPC | George, Hancock, Harrison, Jackson, Stone | 54 min |
| Apr 29, 8:55 PM CDT | Tornado Watch | SPC | George, Hancock, Harrison, Jackson, Pearl River, Stone | 5 hr |
| Apr 29, 9:25 PM CDT | Tornado Watch | SPC | Alcorn, Attala, Benton, Calhoun, Chickasaw, Choctaw and 31 more | 5 hr |
| Apr 29, 11:09 PM CDT | Mesoscale Discussion | SPC | George, Hancock, Harrison, Jackson, Pearl River, Stone | 96 min |
| Apr 29, 11:41 PM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Calhoun, Chickasaw, Choctaw and 31 more | 64 min |
| Apr 30, 1:21 AM CDT | Mesoscale Discussion | SPC | George, Hancock, Harrison, Jackson, Pearl River, Stone | 24 min |
Nearby
Mesoscale Discussions in Mississippi, 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.