Alert archive / Missouri / Tornado Watches in 2019
Tornado Watch 115
The Storm Prediction Center issued this tornado watch at Apr 30, 2019, 8:03 PM CDT for 12 counties in Illinois; 18 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2019, 8:03 PM CDT (01:03 UTC)
- Expired
- May 1, 2019, 1:25 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 30 counties
Bond County, IL, Clinton County, IL, Fayette County, IL, Jackson County, IL, Jefferson County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Bollinger County, MO, Carter County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Osage County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 103 km from the middle of the area, began a volume at 01:04 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
- 30%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 10:26 PM CDT | Tornado Warning | LSX | Crawford | 49 min |
| Apr 30, 10:47 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 28 min |
| Apr 30, 11:05 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Jefferson, Sainte Genevieve, Saint Francois, Washington | 40 min |
| Apr 30, 11:15 PM CDT | Tornado Warning | LSX | Iron, Reynolds, Saint Francois, Washington | 30 min |
| Apr 30, 11:20 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds | 40 min |
| Apr 30, 11:29 PM CDT | Tornado Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois, Washington | 31 min |
| Apr 30, 11:44 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph | 46 min |
| Apr 30, 11:52 PM CDT | Tornado Warning | LSX | Monroe, Randolph | 23 min |
| May 1, 12:12 AM CDT | Severe Thunderstorm Warning | PAH | Perry | 48 min |
| May 1, 12:25 AM CDT | Severe Thunderstorm Warning | LSX | Randolph | 50 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
Lincoln, IL (KILX), launched 00:00Z, 1.1 hours before the alert went out and 298 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
- 37 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 897 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 344 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 7:29 PM CDT | Mesoscale Discussion | SPC | Monroe, Randolph, Saint Clair | 61 min |
| Apr 30, 10:13 PM CDT | Mesoscale Discussion | SPC | Bond, Clinton, Fayette, Jackson, Madison, Marion and 5 more | 92 min |
Nearby
Tornado Watches in Missouri, 2019Tornado Watches in Illinois, 2019Every tornado watch in 2019
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.