Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 69, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Aug 8, 1987, 8:51 PM CDT for Christian County, Sangamon County, Illinois. It was in force for 69 min.
The area
The counties it named.
The facts
- Issued
- Aug 8, 1987, 8:51 PM CDT (01:51 UTC)
- Expired
- Aug 8, 1987, 10:00 PM CDT
- In force
- 69 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
Counties Christian County, IL, 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 00:00Z, 1.9 hours before the alert went out and 114 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
- 1337 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 940 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 318 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 11.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSPI 090151 SVRSPI ILC167-021-090300- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SPRINGFIELD IL 851 PM CDT SAT AUG 8 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1000 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF CENTRAL ILLINOIS...SANGAMON AND SOUTHERN CHRISTIAN AT 8 45 PM CDT RADAR INDICATED A LINE OF VERY STRONG THUNDERSTORMS EXTENDING FROM JUST SOUTH OF PEORIA SOUTHWARD INTO THE SPRINGFIELD AREA. THE STRONGEST THUNDERSTORMS WERE LOCATED FROM THE ATLANTA AREA 40 MILES NORTHEAST OF SPRINGFIELD TO 30 MILES SOUTH OF SPRINGFIELD. 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. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS... STAY AWAY FROM HIGH OBJECTS. MOVE INDOOR IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES AND ELECTRICAL EQUIPMENT. 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, Aug 8, 7:23 PM CDT, 1 hour 28 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPRINGFIELD IL 7 20 PM CDT SAT AUG 8 1987 ...STRONG THUNDERSTORMS OVER WEST CENTRAL ILLINOIS AT 7 15 PM CDT RADAR INDICATED STRONG THUNDERSTORMS OVER WEST CENTRAL ILLINOIS. THE STRONGEST THUNDERSTORM WAS JUST SOUTHWEST OF PALMYRA ILLINOIS ...35 MILES SOUTHWEST OF SPRINGFIELD. OTHER STRONG THUNDERSTORMS WERE LOCATED 30 WEST OF SPRINGFIELD ILLINOIS IN THE JACKSONVILLE AREA. THE STORMS WEREj MOVING EAST AT 30 MPH. THESE STORMS MAY PRODUCE LOCALLY HEAVY RAIN...STRONG GUSTY WINDS AND SMALL HAIL. DAVIS
Special weather statement, Aug 8, 8:10 PM CDT, 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PEORIA IL 810 PM CDT SAT AUG 8 1987 ...THUNDERSTORMS SOUTHWEST AND SOUTH OF PEORIA TO NEAR BLOOMINGTON... AT 805 PM..RADAR INDICATED THUNDERSTORMS ACROSS NORTH CENTRAL ILLINOIS TO THE SOUTHWEST AND SOUTH OF PEORIA TO NEAR BLOOMINGTON..NORMAL. THUNDERSTORMS WERE BETWEEN HAVANA AND LEWISTOWN..ALSO 5 MILES WEST OF DELEVAN AND 5 MILES EAST OF DELEVAN AND ONE WAS LOCATED ABOUT 20 MILES SOUTHEAST OF BLOOMINGTON ON THE SOUTH EDGE OF LEROY. DANGEROUS LIGHTNING..BRIEF GUSTY WINDS TO 45 OR 50 MPH..SMALL HAIL AND HEAVY RAINS ARE LIKELY WITH THESE THUNDERSTORMS AS THEY MOVE EAST AT 35 TO 40 MPH ACROSS NORTHERN MASON..SOUTHERN TAZEWELL AND SOUTHERN MC LEAN COUNTIES BETWEEN 800 PM AND 900 PM. PALMER ATTN ISP DISTS..6..8..AND 9
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 8:04 PM CDT | Tornado Warning | ILX | Christian, Sangamon | 26 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.