Alert archive / Missouri / Tornado Watches in 2009
Tornado Watch 450
The Storm Prediction Center issued this tornado watch at Jun 17, 2009, 7:16 PM CDT for 25 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2009, 7:16 PM CDT (00:16 UTC)
- Expired
- Jun 17, 2009, 11:30 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 25 counties
Benton County, MO, Camden County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Morgan County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 142 km from the middle of the area, began a volume at 00:19 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 90%
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 |
|---|---|---|---|---|
| Jun 17, 8:59 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Osage | 46 min |
| Jun 17, 9:44 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade | 46 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
Springfield, MO (KSGF), launched 00:00Z, 0.3 hours before the alert went out and 193 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
- 2393 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1588 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 11:53 PM CDT | Severe Thunderstorm Watch | SPC | Hancock, Henderson, McDonough, Mercer, Rock Island, Warren | 6 hr |
| Jun 18, 1:01 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 11 more | 89 min |
| Jun 18, 3:20 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Christian, DeWitt, Douglas and 27 more | 85 min |
| Jun 18, 4:12 AM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 5 hr |
| Jun 18, 6:09 AM CDT | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Edgar and 15 more | 2 hr |
| Jun 18, 6:30 AM CDT | Severe Thunderstorm Watch | SPC | Edwards, Gallatin, Hamilton, Wabash, Wayne, White | 6 hr |
| Jun 18, 9:42 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henderson, Henry, Knox, LaSalle and 9 more | 93 min |
| Jun 18, 10:11 AM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, DeWitt, Ford, Fulton, Grundy and 21 more | 6 hr |
| Jun 18, 1:17 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Fulton, Henderson, Henry, Knox and 17 more | 88 min |
Nearby
Tornado Watches in Missouri, 2009Every tornado watch in 2009
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.