Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 68, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Aug 3, 1987, 6:55 PM CDT for Mason County, Tazewell County, Illinois. It was in force for 65 min.
The area
The counties it named.
The facts
- Issued
- Aug 3, 1987, 6:55 PM CDT (23:55 UTC)
- Expired
- Aug 3, 1987, 8:00 PM CDT
- In force
- 65 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
Counties Mason County, IL, Tazewell 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, 11.9 hours before the alert went out and 34 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
- 1310 J/kg
- Mixed-layer CIN
- -140 J/kg
- Mixed-layer LCL
- 1154 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- -24 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 KPIA 032355 SVRPIA ILC179-125-040100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PEORIA IL 655 PM CDT MON AUG 3 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF CENTRAL ILLINOIS...SOUTHERN TAZEWELL AND MASON AT 650 PM CDT..RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 35 TO 40 MILES SOUTHWEST OF PEORIA JUST EAST OF LEWISTOWN AND JUST NORTH OF HAVANA. THIS SEVERE STORM WAS MOVING EAST AT 30 TO 35 MPH. HAVANA..MANITO..MASON CITY..DELEVAN AND SAN JOSE ARE IN THE PATH OF THIS STORM. 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 LIGHTNING. ATTN ISP DISTS.. 8 AND 9 PALMER
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 3, 3:29 PM CDT, 3 hours 26 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PEORIA IL 330 PM CDT MON AUG 3 1987 ...STRONG THUNDERSTORMS IN CENTRAL ILLINOIS FROM GALESBURG TO 20 MILES EAST OF MOLINE... AT 320 PM...RADAR INDICATED A 15 MILE WIDE BAND OF STRONG THUNDERSTORMS OVER CENTRAL ILLINOIS FROM GALESBURG NORTH TO 20 MILES EAST OF MOLINE AND NORTHWARD. THESE STRONG STORMS WERE MOVING EAST AT 35 MPH. THE LINE OF STORMS WILL BE ENTERING WESTERN BUREAU COUNTY..STARK COUNTY AND MOVING ACROSS KNOX COUNTY THROUGH 400 PM. FREQUENT DANGEROUS LIGHTENING..LARGE HAIL..BRIEF GUSTY WINDS TO 50 MPH AND HEAVY RAIN WILL ACCOMPANY THESE STORMS. PEOPLE IN THESE COUNTIES SHOULD TAKE SHELTER INSIDE A BUILDING FOR S AFETY BEFORE THESE STORMS ADVANCE UPON YOU. PALMER ATTN ISP DISTS...7..8..AND 17
Special weather statement, Aug 3, 4:56 PM CDT, 1 hour 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPRINGFIELD IL 455 PM CDT MON AUG 3 1987 ...A SEVERE THUNDERSTORM WATCH CONTINUES IN CENTRAL AND NORTHERN ILLINOIS UNTIL 9PM THIS EVENING... AT 450 PM CDT A STRONG THUNDERSTORM WAS LOCATED BETWEEN SPRINGFIELD AND LINCOLN ILLINOIS. ANOTHER STRONG THUNDERSTORM WAS ABOUT 5 MILES EAST OF SPRINGFIELD. THESE WERE MOVING TOWARD THE EAST AT ABOUT 15 MILES AN HOUR. OTHER THUNDERSTORMS WERE SCATTERED FROM MOLINE TO PEORIA TO SPRINGFIELD TO MATTOON. THESE THUNDERSTORMS COULD PRODUCE HEAVY RAIN STRONG GUSTY WINDS AND HAIL. IF THREATENING WEATHER APPROACHES YOUR AREA...BE SAFE AND SEEK SHELTER. REEDY
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 3:52 PM CDT | Severe Thunderstorm Warning | ILX | Knox, Stark | 68 min |
| Aug 3, 4:27 PM CDT | Severe Thunderstorm Warning | ILX | Boone, Winnebago | 48 min |
| Aug 3, 5:02 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 58 min |
| Aug 3, 5:19 PM CDT | Severe Thunderstorm Warning | ILX | Tazewell, Woodford | 56 min |
| Aug 3, 5:19 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Putnam | 56 min |
| Aug 3, 5:42 PM CDT | Severe Thunderstorm Warning | ILX | Henderson, McDonough, Warren | 48 min |
| Aug 3, 5:42 PM CDT | Severe Thunderstorm Warning | ILX | Hancock | 48 min |
| Aug 3, 6:35 PM CDT | Severe Thunderstorm Warning | ILX | McDonough | 55 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.