Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 46, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Jul 9, 1987, 11:25 AM CDT for Macon County, Illinois. It was in force for 36 min. 1 report 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
- Jul 9, 1987, 11:25 AM CDT (16:25 UTC)
- Expired
- Jul 9, 1987, 12:01 PM CDT
- In force
- 36 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Macon County, IL
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 |
|---|---|---|---|
| Jul 9, 12:00 PM CDT | Thunderstorm Wind 0 | Macon, IL |
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, 4.4 hours before the alert went out and 105 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
- 2378 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 727 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 50 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 091625 SVRSPI ILC115-091715- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SPRINGFIELD IL 1125 AM CDT THU JUL 9 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL ILLINOIS...MACON AT 11 20 AM CDT MACON COUNTY EMERGENCY SERVICES AGENCY REPORTED TREES UPROOTED AND HIGH WINDS NEAR BLUE MOUND ILLINOIS IN SOUTHERN MACON COUNTY. BLUE MOUND IS 15 MILES SOUTH OF DECATUR ILLINOIS. THE AREA OF THUNDERSTORMS WERE MOVING EAST AT 20 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. THIS SLOW MOVING THUNDERSTORM MAY CAUSE FLOODING OF SMALL STREAMS AND UNDERPASSES. 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. THIS IS A DANGEROUS STORM. TAKE COVER IMMEDIATELY. ATTN ISP DIST...10 HILLIARD
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 9, 9:45 AM CDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPRINGFIELD IL 9 40 AM CDT THU JUL 9 1987 ...STRONG THUNDERSTORMS IN CENTRAL ILLINOIS... AT 9 35 AM CDT WEATHER SERVICE RADARS SHOWS VERY STRONG THUNDERSTORMS IN A 40 MILE WIDE BAND 20 MILES EITHER SIDE OF A LINE FROM ALTON ILLINOIS TO JUST NORTHEAST OF CLINTON ILLINOIS IN DE-WITT COUNTY. THE STRONGEST THUNDERSTORMS WERE IN CHRISTIAN COUNTY JUST EAST OF TAYLORVILLE ILLINOIS AND SOUTHERN MACON COrUNTY SOUTH OF DECATUR ILLINOIS. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 20 MPH THESE THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL...BRIEF STRONG AND GUSTY WINDS...HAIL AND DANGEROUS LIGHTNING. HILLIARD
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.