Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 55, NWS Lincoln, IL

July 29, 1986Christian County, Montgomery County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 29, 1986, 3:53 AM CDT for Christian County, Montgomery County, Illinois. It was in force for 67 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 29, 1986, 3:53 AM CDT (08:53 UTC)
Expired
Jul 29, 1986, 5:00 AM CDT
In force
67 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Christian County, IL, Montgomery 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

TimeReportWhereRemark
Jul 29, 3:55 AM CDTThunderstorm Wind 0Christian, 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

Salem-Leckrone, IL (KSLO), launched 00:00Z, 8.9 hours before the alert went out and 92 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.

Skew-T log-pSkew-T log-p diagram, Salem-Leckrone, IL at 00:00Z on 1986-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4371 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salem-Leckrone, IL at 00:00Z on 1986-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
4371 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
908 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.4
Supercell composite
1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSPI 290853
SVRSPI
ILC021-135-291000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
353 AM CDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 500 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

CENTRAL ILLINOIS...CHRISTIAN AND NORTHERN MONTGOMERY

AT 355AM, A SEVERE THUNDERSTORM WAS 15 MILES SOUTH OF SPRINGFIELD
NEAR PAWNEE. IT WAS MOVING RAPIDLY TOWARD THE SOUTHEAST AT 40 TO 50
MPH. AS THESE STORMS MOVED THROUGH MORGAN AND SANGAMON COUNTIES...
LARGE TREES WERE REPORTED UPROOTED BY HIGH WINDS. PERSONS IN
VULNERABLE AREAS SHOULD TAKE PRECAUTIONS FOR HIGH WINDS.

REMEMBER..A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING AND HEAVY RAINS THAT CAN
QUICKLY FLOOD A LOW LYING AREA.

IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A SAFE PLACE.
ASK rTHE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT OF
SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

 ATTN ISP DIST..9 18
 FS

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 29, 2:42 AM CDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
235 AM CDT TUE JUL 29 1986

...SEVERE THUNDERSTORM WATCH 426 IN EFFECT UNTIL 6AM CDT...
...THUNDERSTORMS PASSING THROUGH CASS AND MORGAN COUNTIES...
AT 230 AM CDT THUNDERSTORMS PRODUCING HEAVY RAIN AND GUSTY WINDS WERE
PASSING THROUGH THE CENTRAL ILLINOIS COUNTIES OF CASS AND MORGAN.

THESE THUNDERSTORMS HAVE WEAKENED SOMEWHAT IN INTENSITY DURING THE
LAST HOUR..AS THEY PASSED THROUGH RUSHVILLE IN SCHUYLER COUNTY, THEY
PRODUCED WIND GUSTS TO 50 MPH.

PERSONS IN CASS AND MORGAN COUNTIES SHOULD REMAIN ON THE ALERT, HOWEVER,
FOR THE CHANCE OF REINTENSIFICATION. THE THUNDERSTORMS WERE MOVING
TOWARD THE SOUTHEAST AT 40 TO 50 MPH. :THE THUNDERSTORMS WILL BE IN
WESTERB SANGAMON AND MACOUPIN COUNTIES BY 4AM.

FS
Special weather statement, Jul 29, 2:44 AM CDT, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
245 AM CDT TUE JUL 29 1986

...TORNADO WATCH CANCELLED FOR COUNTIES IN NORTH CENTRAL ILLINOIS...

THE TORNADO WATCH FOR THE NORTH CENTRAL ILLINOIS COUNTIES OF KNOX..
WARREN..HENDERSON..HANCOCK..MC DONOUGH..FULTON..AND SCHUYLER WAS
CANCELLED AT 230 AM CDT.

THE LINE OF SEVERE STORMS THAT MOVED THROUGH THESE COUNTIES HAD
WEAKENED AND MOVED TO BETWEEN SPRINGFIELD AND QUINCY ILLINOIS
AT 230 AM.

A LARGE AREA OF THUNDERSHOWERS AND RAIN WAS OVER NORTH CENTRAL
ILLINOIS FROM MOLINE TO BETWEEN PEORIA AND BLOOMINGTON TO
SPRINGFIELD.  THE WESTERN EDGE WAS ALONG THE MISSISSIPPI RIVER.

THE LINE OF SEVERE STORMS PRODUCED DAMAGING WINDS OF 60 TO 70 MPH
WINDS AT KEOKUK IOWA AND HAMILTON ILLINOIS JUST ACROSS THE RIVER

FROM KEOKUK AT AROUND 100 AM.  CONSIDERABLE INTERRUPTION TO
POWER DUE TO DOWNED TREE LIMBS WAS REPORTED.

50 TO 60 MPH WINDS CONTINUED THROUGH CARTHAGE ILLINOIS AND
RAEACHED MACOMB JUST BEFORE 200 AM.  RUSHVILLE ILLINOIS REPORTED
50 MPH WINDS AT 222 AM.

ATTN ISP DISTS..7..8..9..14..AND 20

PALMER

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 1:01 AM CDTSevere Thunderstorm WarningILXHancock59 min
Jul 29, 1:36 AM CDTSevere Thunderstorm WarningILXMcDonough, Schuyler27 min
Jul 29, 3:13 AM CDTSevere Thunderstorm WarningILXMorgan, Sangamon62 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1986Every severe thunderstorm warning in 1986

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.