Alert archive / Missouri / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 48, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 3, 1999, 6:42 AM CST for Iron County, Reynolds County, Missouri. It was in force for 33 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 3, 1999, 6:42 AM CST (12:42 UTC)
- Expired
- Apr 3, 1999, 7:15 AM CST
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Iron County, MO, Reynolds County, MO
The radar
The St Louis radar (KLSX), 141 km from the middle of the area, began a volume at 12:46 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 3, 6:50 AM CST | Thunderstorm Wind 51 | Ellington, MO | |
| Apr 3, 7:05 AM CST | Hail 0.75 | Ironton, MO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 0.7 hours before the alert went out and 270 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
- 1749 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 744 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 268 m²/s²
- 0-3 km storm-relative helicity
- 294 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 6.4
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KSTL 031241 RRA SVRSTL MOC093-179-031315- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 642 AM CST SAT APR 3 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... IRON COUNTY IN SOUTHEASTERN MISSOURI REYNOLDS COUNTY IN SOUTHEASTERN MISSOURI * UNTIL 715 AM CST * AT 640 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR CENTERVILLE... MOVING NORTHEAST AT 35 MPH. * LOCATIONS THAT WILL BE AFFECTED... CENTERVILLE BLACK IRONTON BELLEVIEW JOHNSONS SHUT-IN STATE PARK THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY. TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 8:12 AM CST | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Louis | 48 min |
| Apr 3, 8:49 AM CST | Flash Flood Warning | LSX | Iron, Madison, Saint Francois | 3 hr |
| Apr 3, 8:49 AM CST | Flash Flood Warning | LSX | Sainte Genevieve | 3 hr |
| Apr 3, 11:48 AM CST | Flash Flood Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 6 hr |
| Apr 3, 5:12 PM CST | Severe Thunderstorm Warning | LSX | Crawford | 48 min |
| Apr 3, 5:57 PM CST | Flash Flood Warning | LSX | Iron, Madison, Reynolds, Saint Francois | 4 hr |
Nearby
Severe Thunderstorm Warnings in Missouri, 1999Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.