Alert archive / Missouri / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 337
The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2015, 7:57 PM CDT for 4 counties in Illinois; 17 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2015, 7:57 PM CDT (00:57 UTC)
- Expired
- Jun 23, 2015, 12:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 21 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Pike County, IL, Adair County, MO, Audrain County, MO, Chariton County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Schuyler County, MO, Shelby County, MO, Sullivan County, MO
The radar
The St Louis radar (KLSX), 194 km from the middle of the area, began a volume at 00:59 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
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- 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
- 70%
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 |
|---|---|---|---|---|
| Jun 22, 8:12 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 63 min |
| Jun 22, 8:24 PM CDT | Severe Thunderstorm Warning | EAX | Adair, Sullivan | 51 min |
| Jun 22, 8:42 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 20 min |
| Jun 22, 8:52 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 38 min |
| Jun 22, 9:05 PM CDT | Flash Flood Warning | EAX | Adair, Linn, Macon, Putnam, Schuyler, Sullivan | 6 hr |
| Jun 22, 9:08 PM CDT | Severe Thunderstorm Warning | EAX | Adair, Linn, Macon, Sullivan | 52 min |
| Jun 22, 9:49 PM CDT | Flash Flood Warning | EAX | Chariton, Linn, Macon | 6 hr |
| Jun 22, 9:53 PM CDT | Severe Thunderstorm Warning | EAX | Chariton, Linn, Macon | 52 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
Davenport, (KDVN), launched 00:00Z, 1.0 hours before the alert went out and 237 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
- 1958 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 925 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 401 m²/s²
- 0-3 km storm-relative helicity
- 441 m²/s²
- Significant tornado parameter
- 5.7
- Supercell composite
- 17.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 7:31 PM CDT | Mesoscale Discussion | SPC | Cook, Lake | 59 min |
| Jun 22, 7:34 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Hancock, Pike, Schuyler | 56 min |
| Jun 22, 8:16 PM CDT | Mesoscale Discussion | SPC | Bureau, DeWitt, Fulton, Grundy, Hancock, Henderson and 21 more | 59 min |
| Jun 22, 8:17 PM CDT | Tornado Watch | SPC | Iroquois, Kankakee, Will | 6 hr |
| Jun 22, 9:41 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Pike, Scott | 64 min |
| Jun 22, 10:00 PM CDT | Mesoscale Discussion | SPC | Champaign, Cook, Douglas, Ford, Iroquois, Kankakee and 2 more | 60 min |
| Jun 23, 10:40 AM CDT | Mesoscale Discussion | SPC | Atchison, Holt, Nodaway | 95 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.