Alert archive / Missouri / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 764
The Storm Prediction Center issued this severe thunderstorm watch at Jul 27, 2008, 9:39 PM CDT for 21 counties in Illinois; 14 counties in Kentucky; 23 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 27, 2008, 9:39 PM CDT (02:39 UTC)
- Expired
- Jul 28, 2008, 4:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 58 counties
Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Crawford County, MO, Dent County, MO, Iron County, MO, Madison County, MO, Maries County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Perry County, MO, Phelps County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 121 km from the middle of the area, began a volume at 02:38 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 10:15 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Calhoun, Clinton, Jersey, Macoupin, Madison and 3 more | 45 min |
| Jul 28, 1:48 AM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin | 42 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.7 hours before the alert went out and 315 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
- 569 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 1274 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 8:20 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Greene, Jersey, Macoupin, Madison and 4 more | 85 min |
| Jul 28, 1:23 AM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Edwards, Franklin, Gallatin, Hamilton and 17 more | 97 min |
| Jul 28, 1:44 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bath, Bell, Breathitt and 41 more | 2 hr |
| Jul 27, 11:30 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Chariton, Grundy, Linn, Livingston, Macon and 5 more | 9 hr |
| Jul 28, 5:31 AM CDT | Mesoscale Discussion | SPC | Caldwell, Daviess, DeKalb, Gentry, Grundy, Harrison and 4 more | 89 min |
| Jul 28, 7:26 AM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Gentry, Holt, Nodaway, Worth | 94 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2008Severe Thunderstorm Watches in Illinois, 2008Severe Thunderstorm Watches in Kentucky, 2008Every severe thunderstorm watch 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.