Heat in Illinois, July 14 to 21, 2006

Name: Heat in Illinois, July 14 to 21, 2006
Start: 2006-07-14T12:00
End: 2006-07-21T11:00
Location: Illinois

July 14 to 21, 2006 · NWS LSX · 3 events in 3 counties and zones

Right on schedule, a major heat wave hit southwest Illinois in mid-July. Temperatures ranged from the middle 90s to around 100.

Where it happened

Every event with a place to put it; 3 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: 4
Property damage: None recorded
Crop damage: None recorded
Events: 3

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.

Right on schedule, a major heat wave hit southwest Illinois in mid-July. Temperatures ranged from the middle 90s to around 100. The heat index ranged from 100 to close to 115. To make matters worse, severe thunderstorms roared through he St. Louis Metropolitan area on the 19th and 21st causing a major power outage. Some residents were without power for a week to 10 days.

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 14, 11:42 AM CST, 18 minutes earlier.

Area forecast discussion, Jul 14, 11:42 AM CST, 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
1242 PM CDT FRI JUL 14 2006

.UPDATE...CONDITIONS THIS MORNING ARE MUCH DIFFERENT THAT 24 HOURS
AGO WHEN OPPRESSIVE HEAT/HUMIDITY WAS BECOMING WIDESPREAD. FIRST
OFF...BOTH AMBIENT SURFACES TEMPERATURES AND DEW POINTS AT THE
BEGINNING OF THE DAY ARE QUITE A BIT LOWER...A RESULT OF THE
OVERNIGHT CONVECTIVE SYSTEMS AND RESULTANT OUTFLOWS. THERE IS ALSO
AN EXTENSIVE AMOUNT OF CLOUD COVER FM CNTRL MO INTO SW IL...AS
OPPOSED TO ABUNDANT INSOLATION YESTERDAY. THIS CLOUDINESS IS
PARTLY A RESULT OF THE MCV NW OF KUNO. AS A RESULT...TEMPERATURES
AT 16Z TODAY ARE AVERAGING 10 DEGREES COOLER THAN THIS TIME
YESTERDAY. THE COMBINED EFFECTS OF THE AFOREMENTIONED AND MORE
CLOUDS TODAY WILL KEEP TEMPERATURES AT LEAST SEVERAL CATEGORIES
COOLER THAN EARLIER FCST. THIS WILL KEEP CONDITIONS BELOW THE HEAT
WARNING CRITERIA TODAY IN THE STL METRO. THE HEAT SHOULD RETURN
WITH A VENGENCE ON SATURDAY HOWEVER. THEREFORE RATHER THAT CANCEL
A PORTION OF THE EXCESSIVE HEAT WARNING FOR TODAY...WE WILL JUST
LET IT RIDE AND LET THOSE CONCERNED ENTITIES CONTINUE TO PREPARE FOR
THE EXTENDED PERIOD OF DANGEROUS HEAT JUST ON THE HORIZON.

AS FOR PCPN TODAY...THE GREATEST POPS HAVE BEEN TAILORED TO SE MO
AND SW IL WHERE AN OLD MESOSCALE BNDRY IS CURRENTLY DRAPPED. THIS AREA
WILL ALSO SEE THE GREATEST HEATING AND INSTABILITY THIS
AFTERNOON...AND WILL BENEFIT FROM MESOSCALE LIFTING VIA THE EWD
MOVING MCV.

GLASS
&&

.DISCUSSION...LARGE AREA OF STRATIFORM RA AND EMBDD TS WAS MOVG
INTO NW HLF OF FA AT 04Z...BUT AS LO LVL JET BEGAN FUELING MCS OVR
SE KS NWD MSTR TRANSPORT WAS INTERRUPTED...WHICH KILLED PCPN IN
OUR AREA. AS CENTROID OF MCS MOVES THRU SW MO THIS MRNG...MAIN
PCPN THRT IN OUR AREA WL COME FROM PCPN ON N FRINGES OF THE
SYS...PRIMARILY IN THOS AREAS S OF I-70. IN THE N...BLV PCPN THRT
IS QUITE LO THIS MRNG AS AMS HAS STBLZD AND NOT MUCH IN THE WAY OF
SHTWV DYNAMICS HEADING INTO AREA.

MAIN QUESTION FOR THIS AFTN IS HOW THIS MRNGS CNVTN WL IMPACT
REDVLPMT.  COLD POOL WITH SW MO MCS GENERATING AN IMPRESSIVE OUTFLO
BNDRY THAT IS CURRENTLY PUSHING INTO NW AR.  IT MAY BE THAT THIS FTR
WL BE THE PRIMARY FOCUSING MECHANISM FOR AFTN REDVLPMT...BUT THIS
WULD OCR WELL S OF OUR AREA.  HWVR...BOTH NAM/GFS ARE FCSTG SFC
TROF/WK CDFNT INTO THE FA DURG THE HEAT OF THE AFTN...AND WK CNVGC
ALG THIS FTR COUPLED WITH WK INSTABILITY AND SM SHTWV ENERGY MAY BE
JUST ENUF TO CAUSE STORMS TO REFORM.  FOR NOW DECIDED TO KP HIGHEST
POPS OVR SE AREAS WHERE DYNAMICS WL BE JUST A BIT BTR...BUT MAY NEED
TO ALTER THIS DURG THE AFTN AS LOCATION OF TROF/CDFNT AND AMS
INSTABILITY BCMS BTR DEFINED.  ANY STORMS THAT DO FORM THIS AFTN WL
DMNSH THIS EVE WITH LOSS OF HTG.

OTHER FCST PROBLEMS FOR THIS FCST PKG ARE THE TEMPERATURE AND
HUMIDITY TRENDS AS UPR RDG BUILDS INTO MID MSVLY OVR THE NXT 3-7
DAYS.  GOING FCSTS STILL LKS GD AS IT GRDLY TRENDS MAX TEMPS UPWARD
OVR THE NXT SVRL DAYS...REACHING THE MID-UPR 90S BY SUN-ERY NXT
WEEK.  HEAT INDICES WL BE APRCHG DANGEROUS LVLS....WHICH MEANS THE
DWPT FCSTS WL BCM CRITICAL.  DURG THE ERY PART OF JULY AFTN DWPTS
ACR THE REGION HAD BEEN DROPPING DUE TO THE VRY DRY GROUND...BUT THE
RAINFALL OF THE PAST WEEK THAT HAS OCRD N...W...AND S OF STL SHUD
ALLOW DWPTS TO RMN MUCH HIER THRU EVAPORATION AND
EVAPOTRANSPIRATION.  WITH NO REAL CHG IN AMS FORESEEN THRU ERY NXT
WEEK THINK YSTDA AFTNS DWPT TRENDS MAY BE A GD FIRST ESTIMATION OF
WHAT WL OCR OVR THE NXT FEW DAYS.

WITH L-M 70 DWPTS AND HEAT ISLAND BUMPING TEMPS...HEAT INDICES SHUD
EASILY CLIMB AOA 105 FOR STL AREA.  DECIDED TO GO AHD AND ISSUE AN
EXCESSIVE HEAT WARNING FOR METRO AREA BASED ON 3 OR MORE DAYS WITH
HI AOA 105...AND DECIDED TO START THE WRNG TDA.  BLV THAT THERE SHUD
BE A GD WRMUP THIS AFTN AS MRNG CLDS THIN...WITH TEMPS IN THE CITY
REACHING THE M90S.   CRITERIA SHUD BE EVEN EASIER TO MEET SAT AND
SUN...WITH TEMPS PUSHING THE UPR 90S.

ELSW...WL CONT HIGHLIGHTING HI VALUES IN THE ZNS.   EXPANSION OF
HEAT HEADLINES MAY BCM NECESSARY LTR ON...WHEN EXACT DWPT TRENDS BCM
A BIT BTR DEFINED.

PCPN CHCS WL BE QUITE LO DURG THIS HOT SPELL...AS RDGG AND WRM MID LVL
TEMPS WL MAKE IT TUFF FOR CNVTN TO FORM.

TRUETT

&&

.AVIATION...
FOR THE 18Z TAFS...MCV CENTERED JUST NORTH OF KUNO CONTS TO
PRODUCE A MID CLOUD DECK TO ITS NORTH AND NORTHEAST THRU THE STL
AREA INTO SW IL. A FEW -SHRA ARE FALLING FROM WITHIN THIS
DECK...BUT NOTHING THAT HAS RESTRICTED ANY VSBYS. THE MCV SHOULD
CONT TO MOVE EWD ACROSS SE MO THIS AFTERNOON AND HELP SUSTAIN SCT
TSRA FROM SE MO INTO SRN IL FOCUSING ALONG AN OLD WK MESOSCALE
OUTFLOW BNDRY. FEW-SCT CU EXPECTED IN THE WAKE OF THE MCV MID
CLOUD DECK...AND CLEAR SKIES EXPECTED TNGT INTO SAT. MAY SEE SOME
LGT RADIATIONAL MVFR FOG/MIST DEVELOP LATE TNGT GIVEN LGT WINDS
AND MOISTURE FROM RECENT RAINS.

GLASS

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...EXCESSIVE HEAT WARNING UNTIL 7 PM CDT WEDNESDAY FOR ST. CHARLES-
     ST. LOUIS-ST. LOUIS CITY.

IL...EXCESSIVE HEAT WARNING UNTIL 7 PM CDT WEDNESDAY FOR MADISON IL-
     ST. CLAIR IL.

&&

WFO LSX

Hazardous weather outlook, Jul 14, 5:17 AM CST, 6 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
617 AM CDT FRI JUL 14 2006

ILZ100-101-MOZ061-063-064-151130-
MADISON IL-ST. CHARLES-ST. CLAIR IL-ST. LOUIS-ST. LOUIS CITY-
617 AM CDT FRI JUL 14 2006

...EXCESSIVE HEAT WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO
7 PM CDT WEDNESDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ST. LOUIS METRO AREA.

.DAY ONE...TODAY AND TONIGHT

THE HOT AND HUMID WEATHER THAT BEGAN ON THURSDAY WILL CONTINUE
TODAY. HEAT INDICES WILL CLIMB TO AROUND 105 DEGREES THIS
AFTERNOON...AS TEMPERATURES PUSH INTO THE MIDDLE 90S.

IN ADDITION...THERE WILL BE A CHANCE OF THUNDERSTORMS TODAY AND
EARLY TONIGHT. IF THE STORMS DO FORM...THEY WILL BE CAPABLE OF
PRODUCING GUSTY WINDS...SMALL HAIL...AND BRIEF HEAVY DOWNPOURS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE HEAT AND HUMIDITY WILL BECOME MORE OPPRESSIVE AS WE HEAD
THROUGH SATURDAY AND INTO NEXT WEEK. HIGHS WILL CLIMB INTO THE
MIDDLE AND UPPER 90S...PUSHING THE HEAT INDEX INTO THE 105 TO 110 RANGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE URGED TO REPORT ANY HAIL OR GUSTY WINDS TO THE
NATIONAL WEATHER SERVICE IN ST. LOUIS.

ILZ058>060-064-065-069-070-074-079-095>099-102-MOZ018-019-026-027-
034>036-041-042-047>052-059-060-062-065-072>075-084-085-099-
151130-
ADAMS IL-AUDRAIN-BOND IL-BOONE-BROWN IL-CALHOUN IL-CALLAWAY-
CLINTON IL-COLE-CRAWFORD-FAYETTE IL-FRANKLIN-GASCONADE-GREENE IL-
IRON-JEFFERSON-JERSEY IL-KNOX-LEWIS-LINCOLN-MACOUPIN IL-MADISON-
MARION-MARION IL-MONITEAU-MONROE-MONROE IL-MONTGOMERY-
MONTGOMERY IL-OSAGE-PIKE-PIKE IL-RALLS-RANDOLPH IL-REYNOLDS-
SHELBY-ST. FRANCOIS-STE. GENEVIEVE-WARREN-WASHINGTON-
WASHINGTON IL-
617 AM CDT FRI JUL 14 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS SOUTHWEST ILLINOIS.

.DAY ONE...TODAY AND TONIGHT

THERE WILL BE A CHANCE OF THUNDERSTORMS TODAY AND EARLY TONIGHT.
IF THE STORMS DO FORM...THEY WILL BE CAPABLE OF PRODUCING GUSTY
WINDS...SMALL HAIL...AND BRIEF HEAVY DOWNPOURS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SUMMERTIME HEAT AND HUMIDITY WILL BECOME MORE OPPRESSIVE AS WE
HEAD THROUGH SATURDAY AND INTO NEXT WEEK. HIGHS WILL CLIMB INTO
THE MIDDLE AND UPPER 90S...PUSHING THE HEAT INDEX INTO THE 105 TO
110 RANGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE URGED TO REPORT ANY HAIL OR GUSTY WINDS TO THE
NATIONAL WEATHER SERVICE IN ST. LOUIS.

TRUETT

In the hours before

Local storm report, Jul 14, 8:02 AM CST, 3 hours 58 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
902 AM CDT FRI JUL 14 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0220 PM     DOWNBURST        PARK HILLS              37.85N 90.53W
07/13/2006                   ST. FRANCOIS       MO   LAW ENFORCEMENT

            LARGE TREE LIMBS DOWN IN THE PARK HILLS AREA.

0225 PM     DOWNBURST        FARMINGTON              37.78N 90.43W
07/13/2006                   ST. FRANCOIS       MO   LAW ENFORCEMENT

            LARGE TREE LIMBS AND TREES DOWN NEAR D AND O 2 MILES
            NORTH OF FARMINGTON MO

0314 PM     TSTM WND DMG     PACIFIC                 38.48N 90.75W
07/13/2006                   FRANKLIN           MO   EMERGENCY MNGR

            A FEW TREES DOWN IN TOWN...WINDS ESTIMATED AT 60 MPH.

0321 PM     HAIL             PACIFIC                 38.48N 90.75W
07/13/2006  E0.75 INCH       FRANKLIN           MO   TRAINED SPOTTER

            PENNY SIZE HAIL REPORTED IN PACIFIC MO BY SEVERE WEATHER
            SPOTTER

0430 PM     DOWNBURST        3 SE FULTON             38.82N 91.91W
07/13/2006                   CALLAWAY           MO   LAW ENFORCEMENT

            SEVERAL LARGE BRANCHES DOWN. ONE TREE UPROOTED. COUNTY
            ROADS 102W 113N

0435 PM     HAIL             2 E MAYWOOD             39.95N 91.57W
07/13/2006  E0.75 INCH       LEWIS              MO   TRAINED SPOTTER

            ALSO SOME TREE LIMBS DOWN. AT HIGHWAY Z AND 280TH STREET.

0455 PM     HAIL             NEW HAVEN               38.61N 91.22W
07/13/2006  M0.88 INCH       FRANKLIN           MO   TRAINED SPOTTER

            NICKLE SIZE HAIL REPORTED BY SEVERE WEATHER SPOTTER

0517 PM     HAIL             URSA                    40.07N 91.37W
07/13/2006  M0.75 INCH       ADAMS              IL   TRAINED SPOTTER

            REPORTED BY TRAINED SPOTTER

0528 PM     HAIL             LIBERTY                 39.88N 91.11W
07/13/2006  E0.88 INCH       ADAMS              IL   TRAINED SPOTTER

            MOST OF THE HAIL IS PEA SIZE...BUT A FEW UP TO NICKEL
            SIZE.

0540 PM     HAIL             10 W BARRY              39.70N 91.23W
07/13/2006  E1.00 INCH       PIKE               IL   TRAINED SPOTTER

            1 INCH HAIL ALONG HIGHWAY 172

0545 PM     TSTM WND DMG     5 W HULL                39.71N 91.30W
07/13/2006                   PIKE               IL   TRAINED SPOTTER

            SEVERAL LARGE TREE LIMBS AND TREES DOWNN IN KINDERHOOK.
            HAIL THE SIZE OF 0.75 TO 1.00 INCH ALSO OCCURRED IN
            KINDERHOOK. THERE WAS NO STRUCTURAL DAMAGE.

0545 PM     DOWNBURST        HULL                    39.71N 91.21W
07/13/2006                   PIKE               IL   TRAINED SPOTTER

            TREES..LARGE TREE LIMBS AND POWER LINES DOWN IN HULL

0550 PM     TSTM WND DMG     BARRY                   39.70N 91.04W
07/13/2006                   PIKE               IL   TRAINED SPOTTER

            FEW LARGE TREE LIMBS DOWN.

0730 PM     HAIL             MONTGOMERY CITY         38.98N 91.51W
07/13/2006  M0.88 INCH       MONTGOMERY         MO   TRAINED SPOTTER

            NICKLE SIZE HAIL REPORTED BY SEVERE STORM SPOTTER.

0815 PM     FLOOD            BEAUFORT                38.42N 91.19W
07/13/2006                   FRANKLIN           MO   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED REPORTED 3.5 INCHES OF RAINFALL
            WITHIN THE PAST HOUR. SOME LOCAL CREEKS ARE OVER BANKFUL

0920 PM     TSTM WND DMG     ROCHEPORT               38.98N 92.56W
07/13/2006                   BOONE              MO   LAW ENFORCEMENT

            LARGE TREE FELL ON A DOUBLE WIDE TRAILER IN ROCHEPORT.

&&
FOR EVENTS FROM JULY 13...2006

JKRAMPER

The radar

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

Open the radar archive at this moment

Event by event

3 heat. Local standard time, as filed.

Heat, Madison

When: July 14, 12:00 PM CST to July 21, 11:00 AM CST
Where: Madison forecast zone
Injuries: 1 direct, 0 indirect
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.830, -89.905 (the zone’s center; the record gives no point)

Heat, Monroe

When: July 14, 12:00 PM CST to July 21, 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, St. Clair

When: July 14, 12:00 PM CST to July 21, 11:00 AM CST
Where: St. Clair forecast zone
Injuries: 3 direct, 0 indirect
Reported by: OFFICIAL NWS OBS.
Coordinates: 38.470, -89.928 (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 2006 Every state in 2006 This day in weather history Warnings in Illinois, July 2006

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: 5524508, 5524509, 5524510.