Alert archive / Missouri / Tornado Watches in 1999
Tornado Watch 137
The Storm Prediction Center issued this tornado watch at Apr 8, 1999, 6:15 PM CDT for 23 counties in Arkansas; 25 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 1999, 6:15 PM CDT (23:15 UTC)
- Expired
- Apr 8, 1999, 10:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 48 counties
Baxter County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Independence County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Barry County, MO, Carter County, MO, Christian County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Laclede County, MO, Oregon County, MO, Ozark County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Francois County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Webster County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 121 km from the middle of the area, began a volume at 23:17 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.
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 6:51 PM CDT | Tornado Warning | SGF | Christian, Stone | 64 min |
| Apr 8, 7:05 PM CDT | Severe Thunderstorm Warning | SGF | Douglas, Webster, Wright | 65 min |
| Apr 8, 7:19 PM CDT | Tornado Warning | SGF | Douglas | 66 min |
| Apr 8, 7:30 PM CDT | Tornado Warning | TSA | Crawford, Franklin | 30 min |
| Apr 8, 7:53 PM CDT | Tornado Warning | LZK | Johnson | 32 min |
| Apr 8, 7:58 PM CDT | Tornado Warning | TSA | Franklin, Madison | 32 min |
| Apr 8, 8:14 PM CDT | Severe Thunderstorm Warning | LZK | Newton | 46 min |
| Apr 8, 8:49 PM CDT | Severe Thunderstorm Warning | LZK | Johnson | 51 min |
| Apr 8, 8:54 PM CDT | Severe Thunderstorm Warning | LZK | Logan | 36 min |
| Apr 8, 9:44 PM CDT | Tornado Warning | LZK | Pope | 36 min |
| Apr 8, 9:48 PM CDT | Severe Thunderstorm Warning | LZK | Izard, Stone | 47 min |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 11.3 hours before the alert went out and 110 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
- 1128 J/kg
- Mixed-layer CIN
- -214 J/kg
- Mixed-layer LCL
- 1102 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 6:30 AM CDT | Severe Thunderstorm Watch | SPC | Atchison, Holt, Nodaway | 6 hr |
| Apr 8, 11:45 AM CDT | Tornado Watch | SPC | Atchison, Holt | 5 hr |
| Apr 8, 1:00 PM CDT | Tornado Watch | SPC | Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 22 more | 6 hr |
| Apr 8, 5:15 PM CDT | Tornado Watch | SPC | Adair, Clark, Knox, Lewis, Putnam, Schuyler and 1 more | 4 hr |
| Apr 8, 5:15 PM CDT | Tornado Watch | SPC | Audrain, Benton, Boone, Callaway, Camden, Chariton and 24 more | 4 hr |
Nearby
Tornado Watches in Missouri, 1999Tornado Watches in Arkansas, 1999Every tornado watch in 1999
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.