Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 48, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Jul 10, 1987, 6:31 PM CDT for Macoupin County, Illinois. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Jul 10, 1987, 6:31 PM CDT (23:31 UTC)
- Expired
- Jul 10, 1987, 7:30 PM CDT
- In force
- 59 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Macoupin County, IL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Salem-Leckrone, IL (KSLO), launched 12:00Z, 11.5 hours before the alert went out and 112 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
- 1441 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 791 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSPI 102331
SVRSPI
ILC117-110030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
631 PM CDT FRI JUL 10 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY OF
CENTRAL ILLINOIS...NORTHERN MACOUPIN
......TEXT......
AT 630 PM CDT A LINE OF SEVERE THUNDERSTORMS EXTENDED FROM
SPRINGFIELD SOUTHWESTWARD TO JUST EAST OF GREENFIELD...ABOUT
50 MILES SOUTHWEST OF SPRINGFIELD.
THE STORMS WERE MOVING EAST AT 30 MPH.
IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORCED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN AND DANGEROUS LIGHTNING.
REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
ATTN ISP DIST...18
DAVISWhat 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, Jul 10, 2:42 PM CDT, 3 hours 49 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PEORIA IL 235 PM CDT FRI JUL 10 1987 ...STRONG THUNDERSTORMS MOVING INTO WEST CENTRAL ILLINOIS... AT 230 PM CDT THIS FRIDAY AFTERNOON THE LEADING EDGE OF AN AREA OF STRONG THUNDERSTORMS WAS LOCATED FROM ABOUT 25 MILES NORTHEAST OF BURLINGTON IOWA SOUTHWEST THROUGH BURLINGTON TO NEAR KIRKSVILLE IN NORTHEAST MISSOURI. THE STORMS WERE MOVING EAST SOUTHEAST AT ABOUT 25 MPH. THESE STORMS COULD +PRODUCE VERY HEAVY RAIN...DANGEROUS LIGHTENING AND STRONG GUSTY SURFACE WINDS. THEY WILL BE MOVING ACROSS THE WEST CENTRAL ILLINOIS COUNTIES OF HENDERSON...WARREN AND HANCOCK DURING THE NEXT COUPLE OF HOURS OR UNTIL ABOUT 430 PM. ARMBRUST
Special weather statement, Jul 10, 6:08 PM CDT, 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPRINGFIELD IL 6 05 PM CDT FRI JUL 10 1987 AT 6 PM CDT AN AREA OF STRONG THUNDERSTORMS EXTENDED FROM JUST WEST OF SPRINGFIELD SOUTHWESTWARD TO NEAR WHITEHALL...50 MILES SOUTHWEST OF SPRINGFIELD. ANOTHER AREA OF STRONG THUNDERSTORMS WAS LOCATED JUST EAST OF WITT ...45 MILES SOUTHEAST OF SPRINGFIELD...TO NEAR VANDALIA. THESE STORMS WERE MOVING TO THE EAST SOUTHEAST AT 30 MPH. THESE STORMS COULD PRODUCE VERY HEAVY RAIN AND STRONG GUSTY WINDS. DAVIS
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 6:24 PM CDT | Severe Thunderstorm Warning | ILX | Sangamon | 66 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 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; the sounding from the Mesonet's radiosonde archive.