Alert archive / Missouri / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 484
The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2015, 5:45 PM CDT for Monroe County, Randolph County, Illinois; 15 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2015, 5:45 PM CDT (22:45 UTC)
- Expired
- Aug 9, 2015, 10:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Monroe County, IL, Randolph County, IL, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Osage County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 22:47 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:48 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Osage | 42 min |
| Aug 9, 6:19 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Gasconade | 26 min |
| Aug 9, 6:27 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 48 min |
| Aug 9, 6:38 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Washington | 37 min |
| Aug 9, 7:02 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Jefferson, Saint Francois, Washington | 43 min |
| Aug 9, 7:35 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair | 55 min |
| Aug 9, 8:23 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Monroe, Saint Clair, Washington | 52 min |
| Aug 9, 8:29 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair, Washington | 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 12:00Z, 10.8 hours before the alert went out and 262 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
- 834 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 1334 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 3:55 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Jackson, Johnson, Monroe, Perry and 6 more | 2 hr |
| Aug 8, 8:36 PM CDT | Mesoscale Discussion | SPC | Atchison, Holt, Nodaway, Worth | 114 min |
| Aug 8, 8:51 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Daviess, DeKalb, Gentry, Grundy and 5 more | 6 hr |
| Aug 8, 11:11 PM CDT | Mesoscale Discussion | SPC | Atchison, Gentry, Grundy, Harrison, Holt, Mercer and 2 more | 94 min |
| Aug 9, 1:37 AM CDT | Mesoscale Discussion | SPC | Adair, Atchison, Daviess, DeKalb, Gentry, Grundy and 13 more | 83 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2015Severe Thunderstorm Watches in Illinois, 2015Every severe thunderstorm watch in 2015
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.