Heat in Illinois, July 8 to 9, 2002

Name: Heat in Illinois, July 8 to 9, 2002
Start: 2002-07-08T11:00
End: 2002-07-09T23:00
Location: Illinois

July 8 to 9, 2002 · NWS LSX · 17 events in 17 counties and zones

High temperatures climbed into the middle to upper 90's with the Heat Indices from 105 to 110 degrees.

Where it happened

Every event with a place to put it; 17 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: 17

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.

High temperatures climbed into the middle to upper 90's with the Heat Indices from 105 to 110 degrees.

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 Jul 8, 2:55 AM CST, 8 hours 5 minutes earlier.

Area forecast discussion, Jul 8, 2:55 AM CST, 8 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
355 AM CDT MON JUL 8 2002

00Z MDL RUNS CONT PREV TRENDS OF A WWD EXPANSION OF THE UPR
RDG...ALLOWING A WK NW FLOW REGIME TO DVLP OVR N/MID MS RVR VLY.
THIS SHUD GIVE AREA A DECENT SHOT OF PCPN ON TUE...AND BRING A
RESPITE FROM THE HEAT BY MIDWEEK.

IN THE NR TERM HWVR THE HEAT IS ON.  INCRG W COMPONENT IN ADV OF N
PLAINS CDFNT WL PUSH 85H THERMAL RDG INTO OUR AREA DURG THE DAY.
TEMPS FCST BY ALL MDLS TO CLIMB INTO THE 20-22C RANGE BY MID AFTN
WHICH WAS GD ENUF FOR MID 90S TO OUR WEST ON SUN.  ALG WITH THE SLGT
UPWARD NUDGE OF TEMPS WL ALSO COME A SLGT INCR IN HUMIDITY LVLS AS
WELL...SPCLY OVR SE SECTIONS WHICH ENJOYED AN INTRUSION OF LWR DWPTS
THIS PAST WEEKEND.  COMBO OF TEMPS/LWR 70S DWPTS WL PUSH STL METRO
INTO HEAT ADV CRITERIA ONCE AGAIN.

AS FAR AS PCPN IS CONCERNED TDA...NEW GUID IS CONTG TREND OF SUN
RUNS IN SUGGESTING A SLGT CHC OF TSTMS OVR N SECTIONS OF FA TDA IN
AREA OF WK WRM ADV.

PCPN CHCS WL BE INCRG LTR TNGT AND INTO TUE AS CDFNT APRCHS AREA.
WHILE UPR SUPPORT IS NOT IMPRESSIVE...IF ETA/AVN ARE TO BE BLVD SFC
MSTR POOLING IN THE VCNTY OF CDFNT WL PRODUCE A VRY UNSTBL AMS.
WULD CERTAINLY THINK THAT SFC CNVGC ALONE WL BE MORE THAN ENUF TO
GET CNVTN GOING.   IN ADDITION...FOR THE SCND CONSECUTIVE RUN K
INDICES FROM ETA ARE PROGGED INTO THE 40C RANGE...WHICH IS NORMALLY
A VALUE FOR A HIGH CHC POP.   THE ONE NEGATIVE FACTOR FOR PCPN MAY
BE THE WRM 7H TEMPS...WHICH FLIRT WITH 10C BY TUE AFTN.

TEMPS FOR TUE ARE REALLY TRICKY SINCE 85H THERMAL RDG STILL PROGGED
OVR AREA.  IF WRM MID LVL TEMPS RETARD DVLPMNT OF CLDS/CNVTN
THEN TEMPS WL RPDLY JUMP TO TDAS LVLS.  HWVR...IF CNVTN DVLPS ERY
TEMPS WL BE HELD DOWN.  FOR NOW WL CONT LEANING TO THE WRM MET
NUMBERS...WHICH WL KP MOST AREAS IN THE 90S.  THESE TEMPS AND DWPT
POOLING ALG THE FNT WL PUSH HEAT INDEX ABV 105 IN STL AREA AGAIN.
ACTUALLY...HIER DWPTS VALUES CULD MAKE TMRWS CONDS WORSE THAN THOSE
OF TDA.

.STL...HEAT ADVISORY CITY OF STL TODAY THRU TUE.

TRUETT

The radar

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

Open the radar archive at this moment

Event by event

17 heat. Local standard time, as filed.

Heat, Adams

When: July 8, 11:00 AM CST to July 9, 11:00 PM CST
Where: Adams forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.988, -91.188 (the zone’s center; the record gives no point)

Heat, Bond

When: July 8, 11:00 AM CST to July 9, 11:00 PM 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, Brown

When: July 8, 11:00 AM CST to July 9, 11:00 PM CST
Where: Brown forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.962, -90.750 (the zone’s center; the record gives no point)

Heat, Calhoun

When: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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, Pike

When: July 8, 11:00 AM CST to July 9, 11:00 PM CST
Where: Pike forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 39.623, -90.886 (the zone’s center; the record gives no point)

Heat, Randolph

When: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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: July 8, 11:00 AM CST to July 9, 11:00 PM 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, July 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: 5303208, 5303209, 5303210, 5303211, 5303212, 5303213, 5303214, 5303215, 5303216, 5303217, 5303218, 5303219, 5303220, 5303221, 5303222, 5303223, 5303224.