Heat in Illinois, August 1 to 6, 2002

Name: Heat in Illinois, August 1 to 6, 2002
Start: 2002-08-01T23:00
End: 2002-08-06T11:00
Location: Illinois

August 1 to 6, 2002 · NWS LSX · 14 events in 14 counties and zones

The hot temperatures from late July continued into early August. High temperatures were in the upper 90s to around 100 with the heat index from 105 to 115.

Where it happened

Every event with a place to put it; 14 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 14

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LSX wrote it up.

The hot temperatures from late July continued into early August. High temperatures were in the upper 90s to around 100 with the heat index from 105 to 115.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before the first event at Aug 1, 12:50 PM CST, 10 hours 10 minutes earlier.

Area forecast discussion, Aug 1, 12:50 PM CST, 10 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
150 PM CDT THU AUG 1 2002

THE BIG QUESTION FOR THE SHORT TERM IS HOW FAR SOUTH WILL OUR FRONT
PROGRESS BEFORE WASHING OUT.  RELATED TO THIS...WILL ANY PRECIP FORM
ALONG IT TOMORROW AFTER IT WASHES OUT?  THE ETA AND THE AVN ARE
REMARKABLY SIMILAR WITH HOW THEY HANDLE THE FRONT.  THE AVN IS
SLIGHTLY MORE AGGRESSIVE WITH ITS MOVEMENT INTO CENTRAL MISSOURI BY
12Z TOMORROW MORNING.  ETA SLIGHTLY FURTHER NORTH AND WEST AT THAT
TIME.  BY 18Z FRIDAY...BOTH MODELS HAVE STOPPED THE FRONT AND THERE
IS NO MORE SOUTHEASTWARD PROGRESS.  BOTH MODELS ARE AGAIN SIMILAR
WITH MOVING THE FRONT BACK NORTHWARD...WITH THE ETA JUST SLIGHTLY
MORE AGGRESSIVE WITH THE NORTHWARD MOVEMENT.  SURFACE MOISTURE
CONVERGENCE ALONG THE FRONT FROM THE ETA IS NOT VERY
IMPRESSIVE...20-25G/KG AT BEST IN WEST CENTRAL ILLINOIS AND
NORTHEAST MISSOURI TONIGHT.  THE FURTHER SOUTHEAST IT GETS...THE
WEAKER THE CONVERGENCE.  THIS MIGHT BE GOOD ENOUGH FOR SOME
SCATTERED CONVECTION TONIGHT...BUT IM NOT VERY OPTIMISTIC.  THE
METS 58 POP IN THE QUINCY GROUP LOOKS TOO HIGH.  THE 50 POP WEVE
GOT GOING LOOKS ABOUT RIGHT...BUT MAY LOWER IT TO 40.  30 POPS
ELSEWHERE LOOK GOOD.  THERE SEEMS TO BE EVEN LESS REASON TO KEEP
POPS GOING ON FRIDAY THAN THERE DOES FOR TONIGHT.  SURFACE
CONVERGENCE IS VERY WEAK...AND LARGE SCALE DESCENT FROM 5940M 500MB
RIDGE SHOULD KEEP CONVECTION DOWN TO A MINIMUM.  30 POPS ON FRIDAY
AFTERNOON...THEN DRY THEREAFTER LOOKS REASONABLE TO ME.  TEMPS MIGHT
BE HELD DOWN A BIT ON FRIDAY WITH CLOUDS IN VICINITY OF THE
FRONT...AND WE MIGHT SEE SOME DRIER AIR FILTER INTO THE CWFA AS
WELL...SO WILL NOT REISSUE HEAT ADVISORY FOR TOMORROW.

HAVE GOOD CONFIDENCE IN THE EXTENDED PART (MON-THU) OF THIS
PACKAGE.  MEDIUM RANGE MODELS AGREE WITH SLOWLY BUILDING UPR RIDGE
OVER THE MID MS VLY EARLY NEXT WEEK.  WILL KEEP CWA DRY UNDER HI AND
BUMP HIGHS UP A CAT OVER FMR/MEX GUIDANCE AS 850 TEMPS ARE AOA 20C
THRU PERIOD.

.STL...NONE

CARNEY/BRITT

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

14 heat. Local standard time, as filed.

Heat, Bond

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Bond forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.887, -89.436 (the zone’s center; the record gives no point)

Heat, Calhoun

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Calhoun forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.169, -90.667 (the zone’s center; the record gives no point)

Heat, Clinton

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Clinton forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.607, -89.422 (the zone’s center; the record gives no point)

Heat, Fayette

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Fayette forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.000, -89.024 (the zone’s center; the record gives no point)

Heat, Greene

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Greene forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.356, -90.390 (the zone’s center; the record gives no point)

Heat, Jersey

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Jersey forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.086, -90.357 (the zone’s center; the record gives no point)

Heat, Macoupin

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Macoupin forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.261, -89.924 (the zone’s center; the record gives no point)

Heat, Madison

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Madison forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.830, -89.905 (the zone’s center; the record gives no point)

Heat, Marion

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Marion forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.650, -88.919 (the zone’s center; the record gives no point)

Heat, Monroe

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Monroe forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.279, -90.177 (the zone’s center; the record gives no point)

Heat, Montgomery

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Montgomery forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.231, -89.479 (the zone’s center; the record gives no point)

Heat, Randolph

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Randolph forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.052, -89.825 (the zone’s center; the record gives no point)

Heat, St. Clair

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: St. Clair forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.470, -89.928 (the zone’s center; the record gives no point)

Heat, Washington

When: August 1, 11:00 PM CST to August 6, 11:00 AM CST
Where: Washington forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.352, -89.410 (the zone’s center; the record gives no point)

What these are

Heat: Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2002 Every state in 2002 This day in weather history Warnings in Illinois, August 2002

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5314124, 5314125, 5314126, 5314127, 5314128, 5314129, 5314130, 5314131, 5314132, 5314133, 5314134, 5314135, 5314136, 5314137.