Alert archive / Missouri / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 283
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2017, 6:26 PM CDT for Monroe County, Randolph County, Illinois; 34 counties in Missouri. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 6:26 PM CDT (23:26 UTC)
- Expired
- May 27, 2017, 9:46 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 36 counties
Monroe County, IL, Randolph County, IL, Barton County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cedar County, MO, Cole County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Hickory County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, St. Clair County, MO, Vernon County, MO, Warren County, MO, Washington County, MO
The radar
The Springfield radar (KSGF), 130 km from the middle of the area, began a volume at 23:25 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
- 20%
- 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 6:31 PM CDT | Severe Thunderstorm Warning | SGF | Dent, Maries, Phelps, Pulaski | 59 min |
| May 27, 6:45 PM CDT | Severe Thunderstorm Warning | SGF | Dade, Greene, Polk | 45 min |
| May 27, 6:56 PM CDT | Severe Thunderstorm Warning | SGF | Dallas, Laclede | 27 min |
| May 27, 6:57 PM CDT | Severe Thunderstorm Warning | SGF | Laclede, Phelps, Pulaski, Texas | 36 min |
| May 27, 6:58 PM CDT | Severe Thunderstorm Warning | SGF | Dent, Shannon | 32 min |
| May 27, 7:09 PM CDT | Severe Thunderstorm Warning | LSX | Reynolds | 51 min |
| May 27, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Cole, Moniteau | 42 min |
| May 27, 7:21 PM CDT | Severe Thunderstorm Warning | SGF | Dade, Jasper, Lawrence | 39 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, 11.4 hours before the alert went out and 180 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
- 3187 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 766 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 9.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 3:54 AM CDT | Mesoscale Discussion | SPC | Alexander | 2 hr |
| May 27, 1:16 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more | 59 min |
| May 27, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 20 more | 7 hr |
| May 27, 3:50 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more | 85 min |
| May 27, 5:13 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
| May 27, 12:06 AM CDT | Severe Thunderstorm Watch | SPC | Barry, Christian, Douglas, Howell, McDonald, Oregon and 4 more | 5 hr |
| May 27, 2:04 AM CDT | Mesoscale Discussion | SPC | Barry, Christian, Douglas, Howell, McDonald, Oregon and 4 more | 116 min |
| May 27, 4:19 AM CDT | Severe Thunderstorm Watch | SPC | Butler, Dunklin, New Madrid, Pemiscot, Ripley, Stoddard | 6 hr |
| May 27, 6:12 AM CDT | Mesoscale Discussion | SPC | Dunklin, New Madrid, Pemiscot | 2 hr |
| May 27, 9:59 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Callaway, Camden and 47 more | 2 hr |
| May 27, 12:13 PM CDT | Tornado Watch | SPC | Barry, Barton, Bates, Benton, Bollinger, Boone and 61 more | 7 hr |
| May 27, 1:12 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Bollinger, Camden and 50 more | 93 min |
| May 27, 3:29 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Carter, Crawford, Dent, Howell and 14 more | 91 min |
| May 27, 4:24 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dent, Iron and 8 more | 66 min |
| May 27, 5:56 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Callaway, Camden, Cole, Cooper and 18 more | 64 min |
| May 27, 6:17 PM CDT | Mesoscale Discussion | SPC | Howell, Oregon, Ozark, Ripley, Taney | 58 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2017Severe Thunderstorm Watches in Illinois, 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.