Alert archive / Missouri / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 60, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 20, 1987, 7:26 PM CDT for Adair County, Knox County, Lewis County, Missouri. It was in force for 49 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
- Aug 20, 1987, 7:26 PM CDT (00:26 UTC)
- Expired
- Aug 20, 1987, 8:15 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Adair County, MO, Knox County, MO, Lewis 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, 7:35 PM CDT | Hail 1 | Knox, MO | |
| Aug 20, 7:45 PM CDT | Thunderstorm Wind 0 | Lewis, 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, 0.4 hours before the alert went out and 224 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 210025 SVRSTL MOC001-103-111-210115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 726 PM CDT THU AUG 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 815 PM CDT FOR THE FOLLOWING COUNTIES OF NORTHEAST MISSOURI... ADAIR... KNOX... SOUTHWESTERN LEWIS RADAR INDICATES A LINE OF SEVERE THUNDERSTORMS FROM JUST NORTHWEST OF KIRKSVILLE TO 25 MILES EAST OF KIRKSVILLE. THE THUNDERSTORMS WERE MOVING TO THE SOUTHEAST AT 30 MPH. PROTECT YOURSELF FROM DAMAGING WINDS...LARGE HAIL AND LIGHTNING BY STAYING IN A BUILDING...AWAY FROM WINDOWS. DO NOT USE THE TELEPHONE OR ELECTRICAL APPLIANCES...EXCEPT IN EMERGENCIES. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WIND...LARGE HAIL AND DEADLY LIGHTNING. SLAUGHTER/JOKERST
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 7:52 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Shelby | 38 min |
| Aug 20, 8:11 PM CDT | Tornado Warning | LSX | Marion | 19 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
Severe Thunderstorm Warnings in Missouri, 1987Every severe thunderstorm warning 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.