Illinois, 2001

Heat in Illinois, August 7 to 9, 2001

August 7 to 9, 2001 · NWS LSX · 17 events in 17 counties and zones

A second early August Heat Wave hit the area. High temperatures ranged from the lower to upper 90s with the Heat Index from 102 to 110.

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.

A second early August Heat Wave hit the area. High temperatures ranged from the lower to upper 90s with the Heat Index from 102 to 110.

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 6, 2:15 PM CST, 9 hours 45 minutes earlier.

Area forecast discussion, Aug 6, 2:15 PM CST, 9 hours 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
315 PM CDT MON AUG 6 2001

MAIN FOCUS FOR THIS FCST TURNING TO THE FUTURE OF THE REMNANTS OF
BARRY AND POTENTIAL IMPACT LATE TUES NIGHT INTO LATE WED NGT.

RDGG FM THE SFC THRU MID/UPR TROP WL CONT THRU THE NEXT 30H OR SO
AND THIS WL RESULT IN A CONT OF RATHER TRANQUIL WX.  UA DATA THIS
MRNG HOWEVER ALREADY SHWG THE GREATEST HGT CNTR IS RETROGRADING AND
THIS IS BGNG TO RESULT IN A WKNS IN THE HGT FIELD OVR THE MS VLY.
BARRY WHILE SHWG NNW MOTION THIS MRNG APPEARS TO HV BEGUN THE MORE
WNW COURSE IN THE LAST FEW STLT PICS.  APPEARS THAT THE MID/UPR
CIRCLN OVR XTRM ERN TX IS IMPARTING A GREATER INFLUENCE ATTM.  WHILE
THERE ARE SOME SLIGHT DIFS IN PSN AND TMG...THE SHRT RNG MDLS ARE IN
DECENT AGREEMENT TAKING THE REMNANTS OF BARRY TO THE NW AND INTO
XTRM NRN AR BY 36H...INTO SW MO BY 48H AND THEN TURNING TO THE NE
AND MOVG INVOF OF COU BY 60H.  THIS IS THE RESULT OF THE GRADUAL
LESSING INFLUENCE OF THE AFOREMENTIONED TX LOW AND THE DVLPNG WKNS
IN THE HGT FIELD THRU THE MS VLY.  WITH RELATIVELY GOOD AGREEMENT IN
THE MDLS AND CURRENT TRENDS IN AVBL DATASETS...IT IS HARD TO DEVIATE
TOO MUCH.

THE FCST WL BASICALLY FOLLOW THE CONCEPTUAL MODEL OF MCV/WARM CORE
MESOVORTEX BEHAVIOR FOR PCPN DISTRIBUTION.  IN GNRL...DIURNAL
HTG/DESTABILIZATION AND FRICTIONAL CNVRGNC/EKMAN PUMPING LEAD TO
OUTWARD SPIRALLING PCPN BANDS DURING THE DAYTIME...WHILE PCPN BCMS
CONSTRICTED CLOSE TO THE CIRCLN CNTR AT NGT DRIVEN BY MESOSCALE FRCG
AND ANY INTERACTIONS WITH THE LOW LVL INFLOW. WHILE IT IS FAR OUT
ATTM...WE WL NEED TO CLOSELY WATCH THIS SYS ON WED NGT WHEN IT
TRACKS THRU THE HEART OF THE CWFA.  VORT/CIRCLN CNTR WL BE
INTERACTING WITH MOIST SLY LOW LVL FLOW...SHEAR AND WNDS ALF WL BE
WK...PWS WL BE APCHG 2.00 INCHES...AND MDL SNDGS INDCTG WRM CLD
DEPTHS OF 3.5-4.0 KM.  ALL THIS POINTS TO THE POTNTL FOR SLOW
MVMNT...HI PCPN EFFECIENCY WITH A DOMINANCE OF WRM CLD PCPN
PROCESSES AND A CONCENTRATED AREA OF HVY RAFL.  GREATEST THREAT RGN
WL BE NR THE CNTR AND IN A COORIDOOR JUST TO THE RGT OF ITS TRACK.
HIEST POPS WL FOCUS IN THIS RGN.

IN THE EXTDD...AVN SHWG VORT CNTR SHUD BE EXITING THE NE CWFA ERLY
THURS.  BREAK DOWN OF THE UPR RDG WHICH HAS BEEN DOMINATING RECENTLY
AND EVOLUTION OF BROAD CYC UPR FLOW ACRS THE NRN U.S. WL RESULT IN
CD FROPA LATE THURS AND INTO SAT.  HV TRENDED DRY AND COOLER SUN
INTO MON AS THE LRG CAN HI BLDS SSE ACRS THE UPR MIDWEST INTO THE OH
VLY.

.STL....NONE.
GLASS

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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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, Fayette

When
August 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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 7, 12:00 AM CST to August 9, 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)

Heat, Clinton

When
August 7, 12:00 AM CST to August 9, 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)

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

More

Every storm in Illinois in 2001Every state in 2001This day in weather historyWarnings 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: 5263176, 5263177, 5263178, 5263179, 5263273, 5263274, 5263275, 5263276, 5263277, 5263278, 5263279, 5263280, 5263281, 5263282, 5263283, 5263284, 5263480.