Alert archive / Missouri / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 242
The Storm Prediction Center issued this severe thunderstorm watch at May 18, 2017, 9:41 PM CDT for 7 counties in Kansas; 15 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 2017, 9:41 PM CDT (02:41 UTC)
- Expired
- May 19, 2017, 1:51 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 22 counties
Atchison County, KS, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Andrew County, MO, Bates County, MO, Buchanan County, MO, Caldwell County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Holt County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Platte County, MO, Ray County, MO
The radar
The Pleasant Hill radar (KEAX), 42 km from the middle of the area, began a volume at 02:44 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 9:41 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Miami | 49 min |
| May 18, 9:50 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Leavenworth, Wyandotte | 40 min |
| May 18, 9:55 PM CDT | Severe Thunderstorm Warning | EAX | Clay, Clinton | 35 min |
| May 18, 10:01 PM CDT | Severe Thunderstorm Warning | EAX | Atchison, Leavenworth | 29 min |
| May 18, 10:15 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Wyandotte | 45 min |
| May 18, 10:26 PM CDT | Flash Flood Warning | EAX | Johnson, Wyandotte | 3 hr |
| May 18, 10:43 PM CDT | Severe Thunderstorm Warning | EAX | Jackson, Lafayette, Ray | 47 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, 2.7 hours before the alert went out and 254 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
- 2055 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1439 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 7:06 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Chase, Clay, Coffey, Dickinson and 23 more | 84 min |
| May 18, 9:41 PM CDT | Mesoscale Discussion | SPC | Bourbon, Cherokee, Crawford, Johnson, Linn, Miami | 94 min |
| May 19, 3:28 PM CDT | Mesoscale Discussion | SPC | Butler, Chase, Chautauqua, Cowley, Elk, Greenwood and 4 more | 92 min |
| May 19, 4:47 PM CDT | Tornado Watch | SPC | Butler, Chase, Chautauqua, Cowley, Elk, Greenwood and 9 more | 4 hr |
| May 19, 6:45 PM CDT | Mesoscale Discussion | SPC | Butler, Chase, Chautauqua, Cowley, Elk, Greenwood and 10 more | 60 min |
| May 18, 10:58 PM CDT | Tornado Watch | SPC | Barry, Christian, Douglas, Greene, Howell, Lawrence and 10 more | 6 hr |
| May 18, 11:48 PM CDT | Mesoscale Discussion | SPC | Barry, Christian, McDonald, Newton, Stone, Taney | 57 min |
| May 19, 4:07 AM CDT | Mesoscale Discussion | SPC | Callaway, Crawford, Franklin, Gasconade, Jefferson, Lincoln and 9 more | 113 min |
| May 19, 4:16 AM CDT | Severe Thunderstorm Watch | SPC | Crawford, Franklin, Gasconade, Iron, Jefferson, Lincoln and 9 more | 3 hr |
| May 19, 2:13 PM CDT | Mesoscale Discussion | SPC | Barry, Christian, Dade, Douglas, Greene, Howell and 9 more | 92 min |
| May 19, 3:06 PM CDT | Tornado Watch | SPC | Audrain, Barry, Benton, Boone, Callaway, Camden and 41 more | 7 hr |
| May 19, 5:03 PM CDT | Mesoscale Discussion | SPC | Butler, Dunklin, Mississippi, New Madrid, Pemiscot, Stoddard | 117 min |
| May 19, 6:04 PM CDT | Mesoscale Discussion | SPC | Audrain, Barry, Benton, Boone, Callaway, Camden and 47 more | 86 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2017Severe Thunderstorm Watches in Kansas, 2017Every severe thunderstorm watch in 2017
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.