Alert archive / Missouri / Tornado Warnings in 1987
Tornado Warning 1, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Aug 20, 1987, 8:11 PM CDT for Marion County, Missouri. It was in force for 19 min. 1 report 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
- Aug 20, 1987, 8:11 PM CDT (01:11 UTC)
- Expired
- Aug 20, 1987, 8:30 PM CDT
- In force
- 19 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Marion County, MO
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 20, 8:20 PM CDT | Thunderstorm Wind 56 | Marion, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Peoria Regional, IL (KPIA), launched 00:00Z, 1.2 hours before the alert went out and 197 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
- 1095 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 1543 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 210109 TORSTL MOC127-210130- BULLETIN - EBS ACTIVATION AND IMMEDIATE BROADCAST REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 811 PM CDT THU AUG 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 830 PM CDT FOR THE FOLLOWING COUNTY OF NORTHEAST MISSOURI... MARION ST LOUIS RADAR INDICATES A VERY INTENSE THUNDERSTORM 15 MILES NORTHWEST OF HANNIBAL MISSOURI. THIS STORM MAY CONTAIN A TORNADO AND WAS MOVING TO THE SOUTHEAST AT 30 MPH. SEEK SHELTER IMMEDIATELY. GO TO YOUR BASEMENT OR AN INTERIOR ROOM SUCH AS A CLOSET OR BATHROOM ON THE LOWEST FLOOR. GET UNDER SOMETHING STURDY. AVOID WINDOWS AND PROTECT YOURSELF FROM FLYING GLASS AND DEB?RIS. IF YOU ARE IN A CAR OR MOBILE HOME...LEAVE AT ONCE FOR A BUILDING OR OTHER SHELTER. GO TO A BASEMENT OR INTERIOR PART OF THE LOWEST FLOOR. IF NO STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT. SLAUGHTER
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 7:26 PM CDT | Severe Thunderstorm Warning | LSX | Adair, Knox, Lewis | 49 min |
| Aug 20, 7:52 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Shelby | 38 min |
| Aug 20, 9:47 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln | 43 min |
| Aug 20, 9:47 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 33 min |
| Aug 20, 10:25 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles | 35 min |
Nearby
Tornado Warnings in Missouri, 1987Every tornado warning in 1987Tornadoes in 1987
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.