Alert archive / Illinois / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 39, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Jul 6, 1987, 2:21 PM CDT for Stephenson County, Illinois. It was in force for 54 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 6, 1987, 2:21 PM CDT (19:21 UTC)
- Expired
- Jul 6, 1987, 3:15 PM CDT
- In force
- 54 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Stephenson 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 6, 2:30 PM CDT | Thunderstorm Wind 0 | Stephenson, 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, 7.4 hours before the alert went out and 187 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- NaN m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 86 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 KRFD 061921 SVRRFD ILC177-062015- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ROCKFORD IL 221 PM CDT MON JUL 6 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF NORTHWEST ILLINOIS...SOUTHERN STEPHENSON AT 2 15 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM IN SOUTHWEST STEPHENSON COUNTY NEAR TO TOWN OF LORAN. THIS IS JUST SOUTHWEST OF PEARL CITY...WHICH IS ABOUT 40 MILES WEST OF ROCKFORD. THE STORM WAS MOVING TO THE EAST AT 25 MPH. SOME COMMUNITIES AFFECTED BY THIS SEVERE THUNDERSTORM... PEARL CITY...FREEPORT...GERMAN VALLEY. IF YOU ARE IN AN AREA THREATENED BY THE STORM... GO TO A REINFORECED SHELTER. SEVERE THUNDERSTORMS CAN PRODUCE WINDS OF 60 MPH OR GREATER... LARGE HAIL... DANGEROUS LIGHTNING AND HEAVY RAIN THAT CAN QUICKLY FLOOD A LOW LYING AREA. REMEMBER... SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ALERT! ATTN: ISP DIST 16. SANDERS
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 12:21 AM CDT | Tornado Warning | ILX | Clark, Cumberland | 24 min |
| Jul 6, 1:52 PM CDT | Severe Thunderstorm Warning | ILX | Carroll | 53 min |
| Jul 6, 2:54 PM CDT | Severe Thunderstorm Warning | ILX | Winnebago | 51 min |
| Jul 6, 3:13 PM CDT | Severe Thunderstorm Warning | ILX | Boone | 17 min |
| Jul 6, 4:37 PM CDT | Severe Thunderstorm Warning | ILX | Macoupin | 53 min |
| Jul 6, 4:45 PM CDT | Severe Thunderstorm Warning | ILX | Montgomery | 60 min |
| Jul 6, 5:05 PM CDT | Tornado Warning | ILX | Knox, Peoria | 55 min |
| Jul 6, 6:55 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Edgar | 45 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.