Alert archive / Missouri / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 5, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 20, 1987, 3:45 PM CDT for Clark County, Knox County, Scotland County, Missouri. It was in force for 45 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
- May 20, 1987, 3:45 PM CDT (20:45 UTC)
- Expired
- May 20, 1987, 4:30 PM CDT
- In force
- 45 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Clark County, MO, Knox County, MO, Scotland 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 |
|---|---|---|---|
| May 20, 3:55 PM CDT | Thunderstorm Wind 61 | Knox, MO | |
| May 20, 4:05 PM CDT | Thunderstorm Wind 0 | Scotland, 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 12:00Z, 8.8 hours before the alert went out and 207 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
- 1840 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 202045 SVRSTL MOC045-199-103-202130- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SAINT LOUIS MO 345 PM CDT WED MAY 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 430 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHEAST MISSOURI...CLARK...SOUTHERN SCOTLAND AND EASTERN KNOX AT 330 PM CDT A SEVERE THUNDERSTORM WAS REPORTED AT EDINA MISSOURI IN KNOX COUNTY. WINDS ESTIMATED AT 70 MPH AND LARGE HAIL WERE REPORTED WITH THE STORM. SEVERE THUNDERSTORMS WILL PRODUCE DAMAGING WINDS..LARGE HAIL AND DEADLY LIGHTNING. HEAVY RAINS WILL QUICKLY FLOOD SMALL STREAMS AND LOW LYING AREAS. HAMILTON
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 20, 1:12 PM CDT, 2 hours 33 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 100 PM CDT WED MAY 20 1987 ...STRONG THUNDERSTORMS DEVELOPING RAPIDLY OVER CENTRAL MISSOURI... AT 100 PM CDT SEVERAL STRONG THUNDERSTORMS ALONG WITH NUMEROUS SHOWERS WERE BUILDING RAPIDLY OVER PARTS OF CENTRAL MISSOURI. THE STRONGEST OF THESE STORMS WAS JUST EAST OF FULTON OR ABOUT 25 MILES EAST OF COLUMBIA MOVING NORTH AT 35 MPH. ANOTHER STRONG THUNDERSTORM WAS 20 MILES SOUTHWEST OF SEDALIA AND MOVING NORTH AT 35 MPH. SEVERAL OTHER SHOWERS WERE BUILDING RAPIDLY TO THUNDERSTORMS OVER CENTRAL MISSOURI BETWEEN MARSHALL AND BOONVILLE AND OVER ELDON. THUNDERSTORMS WILL CONTINUE TO BUILD QUICKLY OVER MOST AREAS OF CENTRAL MISSOURI THIS AFTERNOON AND THIS EVENING. THE THUNDERSTORMS WILL PRODUCE BRIEF HEAVY RAIN AND DANGEROUS LIGHTNING AND SOME MAY HAVE STRONG GUSTY WINDS AND SMALL HAIL. LARM
Special weather statement, May 20, 1:56 PM CDT, 1 hour 49 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 150 PM CDT WED MAY 20 1987 ...STRONG THUNDERSTORMS CONTINUE TO DEVELOP OVER CENTRAL MISSOURI... AT 145 PM CDT A VERY STRONG THUNDERSTORM WITH SMALL HAIL..STRONG GUSTY WIND..VERY HEAVY RAIN AND DANGEROUS LIGHTNING WAS OVER MONTGOMERY CITY.. 40 MILES EAST OF COLUMBIA..MOVING NORTH AT 35 MPH. NUMEROUS OTHER VERY STRONG THUNDERSTORMS WERE STILL BUILDING OVER MANY PARTS OF CENTRAL MISSOURI AND MOVING NORTH. THUNDERSTORMS WILL CONTINUE TO BUILD OVER MOST AREAS OF CENTRAL MISSOURI THIS AFTERNOON AND THIS EVENING. THE THUNDERSTORMS WILL PRODUCE HEAVY RAIN AND DANGEROUS LIGHTNING AND SOME MAY HAVE STRONG GUSTY WINDS AND SMALL 8HAIL. LARM
Special weather statement, May 20, 3:30 PM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA MO 325 PM CDT WED MAY 20 1987 ...LINE OF STRONG THUNDERSTORMS MOVING THROUGH CENTRAL MISSOURI... AT 323 PM A VERY STRONG THUNDERSTORM WAS LOCATED 10 MILES SOUTH OF MARSHALL. THIS STORM DROPPED MARBLE SIZE HAIL IN SEDALIA ALONG WITH VERY HEAVY RAIN AND WINDS TO 50 MPH. THIS STORM WILL BE MOVING THROUGH THE MARSHALL AREA BY 345 AND IT IS PART OF A 20 MILE WIDE LINE OF THUNDERSTORMS STRETCHING ACROSS CENTRAL MISSOURI FROM MARSHALL TO 10 MILES EAST OF SEDALIA TO 10 MILES NORTHEAST OF WAYNESVILLE. THE LINE WAS MOVING NORTHEAST AT 20 MILES AN HOUR WHILE THE INDIVIDUAL STORMS WERE MOVING NORTH AT 30 MPH. STRONG GUSTY WINDS...SMALL HAIL... FREQUENT LIGHTNING AND HEAVY RAIN WILL ACCOMPANY THESE THUNDERSTORMS. HAGEMEYER
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.