Heat in Illinois, August 1 to 2, 2001

Name: Heat in Illinois, August 1 to 2, 2001
Start: 2001-08-01T00:00
End: 2001-08-02T21:00
Location: Illinois

August 1 to 2, 2001 · NWS LSX · 17 events in 17 counties and zones

The heat wave from late July continued into early August. High temperatures were in the middle 90s with the Heat Index around 105.

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.

The heat wave from late July continued into early August. High temperatures were in the middle 90s with the Heat Index around 105.

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 31, 2:10 PM CST, 9 hours 50 minutes earlier.

Area forecast discussion, Jul 31, 2:10 PM CST, 9 hours 50 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
3300 PM CDT TUE JUL 31 2001

UNUSUALLY SHARP UPPER RDG EXTENDS FM 90 DEG W NWD INTO CNTRL CANADA
WITH DP TROF OVR WRN STATES. GOOD ENERGY ROTATING NEWD TWD TOP OF
RDG WILL CHANGE ORIENTATION FM N/S TO E/W THEN SHIFT IT SLGTLY WWD
FRI INTO WRN KS/CO AS ENERGY DROPS DOWN FRONT SIDE INTO E COAST
TROF. THIS WILL KICK DP SFC LOW NEWD OUT OF DAKOTAS INTO HUDSON BAY
AREA AND DISSIPATE STG GRAD THAT CURRENTLY EXISTS TO W OF CWA. WK
HIGH FOLLOWS S/W OVR TOP OF RDG FM DAKOTAS INTO GRT LAKES. THIS
ALLOWS WK FRONT TO SETTLE INTO IOWA/N MO BORDER AND DISSIPATE DURG
WEEKEND AS HI BUILDS AGAIN. HWVR IN THE MEANTIME ALL MODELS INCR
HUMIDITIES ALG IA BORDER AND CREATE NOCTURNAL MCSS FURTHER NORTH.
THICKNESSES SUPPORT SEWD OR SWD DRIFT OF MCSS SHOULD THEY OCCUR.
THIS MAY BRING LATE NIGHT PCPN TO NRN COUNTIES OR AT LEAST A DENSE
CIRRUS SHIELD. WITH THIS IN MIND THIS SHOULD LOWER NRN ZONES BELOW
HEAT ADVISORY THRESHOLDS BY THURSDAY ONE WAY OR ANOTHER. NOT SURE IT
CAN SAVE THE REST OF THE CWA HOWEVER SO HAVE EXTENDED THE EXCESSIVE
HEAT WARNING THROUGH THURSDAY FOR ALL BUT NRN COUNTIES.

.STL...EXCESSIVE HEAT WARNING IN EFFECT THRU WED FOR THE ENTIRE CWA,
AND THROUGH THURSDAY FOR ALL BUT NORTHERN COUNTIES INCLUDING THE
HANNIBAL/QUINCY/KAHOKA AREAS.

PEDIGO

@RUKWBCeKDENFXUS63 KLSX 312010 CCA
AFDSTL

AREA FORECAST DISCUSSION...CORRECTED TIME
NATIONAL WEATHER SERVICE ST LOUIS MO
300 PM CDT TUE JUL 31 2001

UNUSUALLY SHARP UPPER RDG EXTENDS FM 90 DEG W NWD INTO CNTRL CANADA
WITH DP TROF OVR WRN STATES. GOOD ENERGY ROTATING NEWD TWD TOP OF
RDG WILL CHANGE ORIENTATION FM N/S TO E/W THEN SHIFT IT SLGTLY WWD
FRI INTO WRN KS/CO AS ENERGY DROPS DOWN FRONT SIDE INTO E COAST
TROF. THIS WILL KICK DP SFC LOW NEWD OUT OF DAKOTAS INTO HUDSON BAY
AREA AND DISSIPATE STG GRAD THAT CURRENTLY EXISTS TO W OF CWA. WK
HIGH FOLLOWS S/W OVR TOP OF RDG FM DAKOTAS INTO GRT LAKES. THIS
ALLOWS WK FRONT TO SETTLE INTO IOWA/N MO BORDER AND DISSIPATE DURG
WEEKEND AS HI BUILDS AGAIN. HWVR IN THE MEANTIME ALL MODELS INCR
HUMIDITIES ALG IA BORDER AND CREATE NOCTURNAL MCSS FURTHER NORTH.
THICKNESSES SUPPORT SEWD OR SWD DRIFT OF MCSS SHOULD THEY OCCUR.
THIS MAY BRING LATE NIGHT PCPN TO NRN COUNTIES OR AT LEAST A DENSE
CIRRUS SHIELD. WITH THIS IN MIND THIS SHOULD LOWER NRN ZONES BELOW
HEAT ADVISORY THRESHOLDS BY THURSDAY ONE WAY OR ANOTHER. NOT SURE IT
CAN SAVE THE REST OF THE CWA HOWEVER SO HAVE EXTENDED THE EXCESSIVE
HEAT WARNING THROUGH THURSDAY FOR ALL BUT NRN COUNTIES.

.STL...EXCESSIVE HEAT WARNING IN EFFECT THRU WED FOR THE ENTIRE CWA,
AND THROUGH THURSDAY FOR ALL BUT NORTHERN COUNTIES INCLUDING THE
HANNIBAL/QUINCY/KAHOKA AREAS.

PEDIGO

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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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: August 1, 12:00 AM CST to August 2, 9:00 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 2001 Every state in 2001 This day in weather history Warnings in Illinois, August 2001

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: 5263159, 5263160, 5263161, 5263162, 5263163, 5263164, 5263165, 5263166, 5263167, 5263168, 5263169, 5263170, 5263171, 5263172, 5263173, 5263174, 5263175.