Alert archive / Missouri / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 68
The Storm Prediction Center issued this severe thunderstorm watch at May 2, 2018, 11:09 PM CDT for 18 counties in Arkansas; 11 counties in Illinois; 63 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 2, 2018, 11:09 PM CDT (04:09 UTC)
- Expired
- May 3, 2018, 5:58 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 92 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Audrain County, MO, Barry County, MO, Barton County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Iron County, MO, Jasper County, MO, Jefferson County, MO, Knox County, MO, Laclede County, MO, Lawrence County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Marion County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Shelby County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 78 km from the middle of the area, began a volume at 04:11 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
- 10%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 11:58 PM CDT | Severe Thunderstorm Warning | SGF | Barton, Jasper, Newton | 62 min |
| May 3, 12:22 AM CDT | Severe Thunderstorm Warning | TSA | Crawford, Washington | 53 min |
| May 3, 12:40 AM CDT | Severe Thunderstorm Warning | SGF | Cedar, Dade, Lawrence | 48 min |
| May 3, 1:10 AM CDT | Severe Thunderstorm Warning | LSX | Audrain, Callaway, Montgomery, Pike, Ralls | 50 min |
| May 3, 2:06 AM CDT | Severe Thunderstorm Warning | SGF | Christian, Douglas, Greene, Webster | 54 min |
| May 3, 2:10 AM CDT | Tornado Warning | SGF | Christian, Greene, Webster | 22 min |
| May 3, 2:16 AM CDT | Severe Thunderstorm Warning | LSX | Lincoln | 29 min |
| May 3, 2:27 AM CDT | Severe Thunderstorm Warning | SGF | Douglas, Ozark, Taney | 48 min |
| May 3, 2:39 AM CDT | Severe Thunderstorm Warning | SGF | Douglas, Wright | 66 min |
| May 3, 2:41 AM CDT | Tornado Warning | SGF | Douglas | 19 min |
| May 3, 3:00 AM CDT | Tornado Warning | SGF | Douglas, Howell, Texas, Wright | 45 min |
| May 3, 3:10 AM CDT | Severe Thunderstorm Warning | SGF | Texas | 52 min |
| May 3, 3:12 AM CDT | Severe Thunderstorm Warning | SGF | Douglas, Howell, Ozark | 48 min |
| May 3, 3:27 AM CDT | Severe Thunderstorm Warning | LZK | Baxter, Fulton, Izard | 48 min |
| May 3, 3:43 AM CDT | Severe Thunderstorm Warning | LSX | Franklin, Saint Charles, Saint Louis, Warren | 47 min |
| May 3, 3:46 AM CDT | Severe Thunderstorm Warning | SGF | Dent, Oregon, Shannon | 59 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, 4.2 hours before the alert went out and 130 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
- 1170 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1041 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 164 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 10:20 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more | 115 min |
| May 3, 2:32 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Franklin, Fulton, Izard and 6 more | 88 min |
| May 3, 9:02 AM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Sebastian, Washington | 88 min |
| May 3, 12:35 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Clark, Conway, Crawford, Franklin and 22 more | 85 min |
| May 3, 1:44 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Clark, Clay, Cleburne, Conway, Craighead and 34 more | 4 hr |
| May 3, 3:45 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 25 more | 60 min |
| May 3, 4:52 PM CDT | Mesoscale Discussion | SPC | Baxter, Clark, Clay, Cleburne, Cleveland, Conway and 31 more | 53 min |
| May 2, 7:21 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more | 84 min |
| May 2, 10:01 PM CDT | Mesoscale Discussion | SPC | Bureau, DeKalb, DuPage, Grundy, Henderson, Henry and 18 more | 89 min |
| May 2, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Cook, DeKalb, DuPage, Ford, Fulton and 23 more | 4 hr |
| May 3, 1:57 AM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DeWitt, DuPage, Ford and 22 more | 93 min |
| May 2, 8:00 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Atchison, Bates, Benton, Buchanan and 33 more | 90 min |
| May 2, 11:09 PM CDT | Mesoscale Discussion | SPC | McDonald | 96 min |
| May 3, 2:36 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 10 more | 114 min |
| May 3, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more | 6 hr |
| May 3, 5:58 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more | 92 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2018Severe Thunderstorm Watches in Arkansas, 2018Severe Thunderstorm Watches in Illinois, 2018Every severe thunderstorm watch in 2018
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.