Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 47, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Jul 10, 1987, 6:24 PM CDT for Sangamon County, Illinois. It was in force for 66 min.
The area
The counties it named.
The facts
- Issued
- Jul 10, 1987, 6:24 PM CDT (23:24 UTC)
- Expired
- Jul 10, 1987, 7:30 PM CDT
- In force
- 66 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Sangamon 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
Peoria Regional, IL (KPIA), launched 12:00Z, 11.4 hours before the alert went out and 102 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
- 1062 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 762 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -68 m²/s²
- 0-3 km storm-relative helicity
- -62 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 102324 SVRSPI ILC167-110030- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SPRINGFIELD IL 624 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...SOUTHERN SANGAMON AT 6 20 PM CDT A LINE OF SEVERE THUNDERSTORMS EXTENDED FROM SPRINGFIELD ILLINOIS SOUTHWEST TO NEAR GREENFIELD...45 MILES SOUTHWEST OF SPRINGFIELD. THE STORMS WERE MOVING SOUTHEAST 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...9 DAVIS
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, Jul 10, 2:42 PM CDT, 3 hours 42 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, 16 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, 6:31 PM CDT | Severe Thunderstorm Warning | ILX | Macoupin | 59 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.