Alert archive / Missouri / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 137
The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2003, 1:50 AM CDT for 5 counties in Illinois; 20 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2003, 1:50 AM CDT (06:50 UTC)
- Expired
- Apr 20, 2003, 7:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 25 counties
Jackson County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Washington County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, New Madrid County, MO, Oregon County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 162 km from the middle of the area, began a volume at 06:53 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.
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, 6.8 hours before the alert went out and 281 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
- 11 J/kg
- Mixed-layer CIN
- -140 J/kg
- Mixed-layer LCL
- 902 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 1:25 AM CDT | Mesoscale Discussion | SPC | Clinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 1 more | 2 hr |
| Apr 20, 4:00 AM CDT | Mesoscale Discussion | SPC | Jackson, Monroe, Perry, Randolph, Washington | 2 hr |
| Apr 20, 11:52 AM CDT | Mesoscale Discussion | SPC | Alexander, Clark, Clay, Coles, Crawford, Cumberland and 23 more | 2 hr |
| Apr 20, 12:20 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Edgar, Edwards, Hamilton, Jasper and 6 more | 6 hr |
| Apr 20, 1:00 PM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 3 hr |
| Apr 20, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Saline | 5 hr |
| Apr 19, 8:29 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Cass, Cedar and 15 more | 2 hr |
| Apr 19, 8:55 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Lawrence, McDonald, Newton | 5 hr |
| Apr 19, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Callaway, Camden, Christian, Cole, Cooper and 20 more | 5 hr |
| Apr 19, 10:42 PM CDT | Mesoscale Discussion | SPC | Barry, McDonald, Newton | 93 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2003Severe Thunderstorm Watches in Illinois, 2003Every severe thunderstorm watch in 2003
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.