Alert archive / Missouri / Heat Advisories in 2016

Heat Advisory 5, NWS St. Louis, MO

July 18, 201629 counties in Missouri; 17 counties in Illinois

NWS St. Louis, MO issued this heat advisory at Jul 18, 2016, 3:54 AM CDT for 29 counties in Missouri; 17 counties in Illinois. It took effect at Jul 18, 2016, 12:00 PM CDT. It was in force for 40 hr.

The area

The counties it named.

The facts

Issued
Jul 18, 2016, 3:54 AM CDT (08:54 UTC)
In effect from
Jul 18, 2016, 12:00 PM CDT
Expired
Jul 20, 2016, 3:39 AM CDT
In force
40 hr
Issued by
NWS St. Louis, MO
All 46 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 18 km from the middle of the area, began a volume at 08:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 8.9 hours before the alert went out and 241 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2016-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3314 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2016-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3314 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1062 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
3.3
Supercell composite
26.5

Open this sounding in Storm Lab

The text

As transmitted.

600 
WWUS73 KLSX 180854
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
354 AM CDT MON JUL 18 2016

ILZ100-101-MOZ061-063-064-182200-
/O.NEW.KLSX.HT.Y.0005.160718T1700Z-160723T0000Z/
MADISON IL-SAINT CHARLES MO-SAINT CLAIR IL-SAINT LOUIS CITY MO-
SAINT LOUIS MO-
INCLUDING THE CITIES OF...ALTON...BELLEVILLE...CAHOKIA...
EDWARDSVILLE...SAINT CHARLES...SAINT LOUIS
354 AM CDT MON JUL 18 2016

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 7 PM CDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A HEAT
ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 7 PM CDT FRIDAY.

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 100 DEGREES EACH
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...IN EXCESS OF 100 DEGREES DUE TO TEMPERATURES
  IN THE MID TO UPPER 90S...AND DEWPOINTS IN THE MID 70S. HEAT
  INDEX VALUES UP TO 110 ARE POSSIBLE BY THE END OF THE WEEK.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
  WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED STRESS AND
  ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE WITHOUT AIR
  CONDITIONING...AND THOSE PARTICIPATING IN STRENUOUS OUTDOOR
  ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. ALSO...CAR INTERIORS
  CAN REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES AND HIGH
HUMIDITY WILL OCCUR. THIS COMBINATION WILL CREATE A SITUATION IN
WHICH HEAT-RELATED ILLNESSES ARE POSSIBLE...ESPECIALLY FOR THOSE
LIVING IN UN-AIR CONDITIONED HOMES OR APARTMENTS. PEOPLE IN THE
ADVISORY AREA ARE ADVISED TO AVOID POORLY VENTILATED AREAS AND
PROLONGED WORK IN THE SUN. ALSO...KEEP PLENTY OF LIQUIDS ON HAND
AND TRY TO STAY IN AN AIR CONDITIONED ENVIRONMENT.

PEOPLE IN THE SAINT LOUIS METROPOLITAN AREA CAN GET INFORMATION
ABOUT COOLING CENTERS OR ENERGY ASSISTANCE RELATED TO THE EXCESSIVE
HEAT BY CALLING THE UNITED WAY OF GREATER SAINT LOUIS AT 
800-427-4626...OR IF CALLING FROM A LAND LINE PHONE DIAL 2-1-1.
YOU CAN ALSO CALL COOL DOWN SAINT LOUIS AT 314-241-7668.

&&

$$

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-
182200-
/O.NEW.KLSX.HT.Y.0005.160718T1700Z-160723T0000Z/
ADAMS IL-AUDRAIN MO-BOND IL-BOONE MO-BROWN IL-CALHOUN IL-
CALLAWAY MO-CLINTON IL-COLE MO-CRAWFORD MO-FAYETTE IL-FRANKLIN MO-
GASCONADE MO-GREENE IL-IRON MO-JEFFERSON MO-JERSEY IL-KNOX MO-
LEWIS MO-LINCOLN MO-MACOUPIN IL-MADISON MO-MARION IL-MARION MO-
MONITEAU MO-MONROE IL-MONROE MO-MONTGOMERY IL-MONTGOMERY MO-
OSAGE MO-PIKE IL-PIKE MO-RALLS MO-RANDOLPH IL-REYNOLDS MO-
SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-SHELBY MO-WARREN MO-
WASHINGTON IL-WASHINGTON MO-
INCLUDING THE CITIES OF...BOWLING GREEN...CENTRALIA...CHESTER...
COLUMBIA...FARMINGTON...FULTON...HANNIBAL...JEFFERSON CITY...
LITCHFIELD...MEXICO...MOUNT STERLING...PITTSFIELD...QUINCY...
SALEM...SPARTA...SULLIVAN...UNION...VANDALIA...WASHINGTON
354 AM CDT MON JUL 18 2016

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 7 PM CDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A HEAT
ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 7 PM CDT FRIDAY.

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 100 DEGREES EACH
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...IN EXCESS OF 100 DEGREES DUE TO TEMPERATURES
  IN THE MID TO UPPER 90S...AND DEWPOINTS IN THE MID 70S. HEAT
  INDEX VALUES UP TO 110 ARE POSSIBLE BY THE END OF THE WEEK.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
  WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED STRESS
  AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE WITHOUT AIR
  CONDITIONING...AND THOSE PARTICIPATING IN STRENUOUS OUTDOOR
  ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. ALSO...CAR INTERIORS
  CAN REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES AND HIGH
HUMIDITY WILL OCCUR. THIS COMBINATION WILL CREATE A SITUATION IN
WHICH HEAT-RELATED ILLNESSES ARE POSSIBLE...ESPECIALLY FOR THOSE
LIVING IN UN-AIR CONDITIONED HOMES OR APARTMENTS. PEOPLE IN THE
ADVISORY AREA ARE ADVISED TO AVOID POORLY VENTILATED AREAS AND
PROLONGED WORK IN THE SUN. ALSO...KEEP PLENTY OF LIQUIDS ON HAND
AND TRY TO STAY IN AN AIR CONDITIONED ENVIRONMENT.

&&

$$

CARNEY
4 follow-up statements
043 
WWUS73 KLSX 182104
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
404 PM CDT MON JUL 18 2016

ILZ100>102-MOZ061-063>065-190915-
/O.UPG.KLSX.HT.Y.0005.000000T0000Z-160723T0000Z/
/O.NEW.KLSX.EH.W.0001.160718T2104Z-160723T0000Z/
JEFFERSON MO-MADISON IL-MONROE IL-SAINT CHARLES MO-SAINT CLAIR IL-
SAINT LOUIS CITY MO-SAINT LOUIS MO-
INCLUDING THE CITIES OF...ALTON...BELLEVILLE...CAHOKIA...
EDWARDSVILLE...SAINT CHARLES...SAINT LOUIS
404 PM CDT MON JUL 18 2016

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED AN EXCESSIVE
HEAT WARNING...WHICH IS IN EFFECT UNTIL 7 PM CDT FRIDAY. THE HEAT
ADVISORY IS NO LONGER IN EFFECT.

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH 
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...UP TO 110 DUE TO TEMPERATURES IN THE UPPER
  90S...AND DEWPOINTS IN THE MID 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS. PEOPLE IN THE WARNING AREA ARE ADVISED TO AVOID
POORLY VENTILATED AREAS AND PROLONGED WORK IN THE SUN. USE AIR
CONDITIONING IN YOUR HOUSE OR APARTMENT IF IT IS WORKING
CORRECTLY. IF YOU DO NOT HAVE AIR CONDITIONING...KEEP YOUR HOUSE
OR APARTMENT WELL VENTILATED WITH FANS...AND TRY TO SPEND SOME
TIME IN AN AIR CONDITIONED ENVIRONMENT TO GIVE YOUR BODY A BREAK
FROM THE HEAT.

  TAKE EXTRA PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO THE EARLY MORNING
OR EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND
HEAT STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

  TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY
AND HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST
BREAKS IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME
BY HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT
STROKE IS AN EMERGENCY...CALL 9-1-1 IMMEDIATELY.

  BEAT THE HEAT...CHECK THE BACKSEAT! YOUNG CHILDREN AND PETS
SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES UNDER ANY
CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING WARM OR HOT WEATHER
WHEN CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER OF
MINUTES.

&&

$$

MOZ041-047-048-190915-
/O.UPG.KLSX.HT.Y.0005.000000T0000Z-160723T0000Z/
/O.NEW.KLSX.EH.W.0001.160718T2104Z-160723T0000Z/
BOONE MO-COLE MO-MONITEAU MO-
INCLUDING THE CITIES OF...COLUMBIA...JEFFERSON CITY
404 PM CDT MON JUL 18 2016

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED AN EXCESSIVE
HEAT WARNING...WHICH IS IN EFFECT UNTIL 7 PM CDT FRIDAY. THE HEAT
ADVISORY IS NO LONGER IN EFFECT.

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH 
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...UP TO 107 DUE TO TEMPERATURES IN THE UPPER 
  90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS. PEOPLE IN THE WARNING AREA ARE ADVISED TO AVOID
POORLY VENTILATED AREAS AND PROLONGED WORK IN THE SUN. USE AIR
CONDITIONING IN YOUR HOUSE OR APARTMENT IF IT IS WORKING
CORRECTLY. IF YOU DO NOT HAVE AIR CONDITIONING...KEEP YOUR HOUSE
OR APARTMENT WELL VENTILATED WITH FANS...AND TRY TO SPEND SOME
TIME IN AN AIR CONDITIONED ENVIRONMENT TO GIVE YOUR BODY A BREAK
FROM THE HEAT.

  TAKE EXTRA PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO THE EARLY MORNING
OR EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND
HEAT STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

  TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY
AND HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST
BREAKS IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME
BY HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT
STROKE IS AN EMERGENCY...CALL 9-1-1 IMMEDIATELY.

  BEAT THE HEAT...CHECK THE BACKSEAT! YOUNG CHILDREN AND PETS
SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES UNDER ANY
CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING WARM OR HOT WEATHER
WHEN CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER OF
MINUTES.

&&

$$

ILZ058>060-064-065-069-070-074-079-095>099-MOZ018-019-026-027-
034>036-042-049>052-059-060-062-072>075-084-085-099-190915-
/O.CON.KLSX.HT.Y.0005.000000T0000Z-160723T0000Z/
ADAMS IL-AUDRAIN MO-BOND IL-BROWN IL-CALHOUN IL-CALLAWAY MO-
CLINTON IL-CRAWFORD MO-FAYETTE IL-FRANKLIN MO-GASCONADE MO-
GREENE IL-IRON MO-JERSEY IL-KNOX MO-LEWIS MO-LINCOLN MO-
MACOUPIN IL-MADISON MO-MARION IL-MARION MO-MONROE MO-
MONTGOMERY IL-MONTGOMERY MO-OSAGE MO-PIKE IL-PIKE MO-RALLS MO-
RANDOLPH IL-REYNOLDS MO-SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-
SHELBY MO-WARREN MO-WASHINGTON IL-WASHINGTON MO-
INCLUDING THE CITIES OF...BOWLING GREEN...CENTRALIA...CHESTER...
FARMINGTON...FULTON...HANNIBAL...LITCHFIELD...MEXICO...
MOUNT STERLING...PITTSFIELD...QUINCY...SALEM...SPARTA...
SULLIVAN...UNION...VANDALIA...WASHINGTON
404 PM CDT MON JUL 18 2016

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT FRIDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 100 DEGREES EACH 
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...UP TO 108 DUE TO TEMPERATURES IN THE UPPER 
  90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES AND HIGH
HUMIDITY WILL OCCUR. THIS COMBINATION WILL CREATE A SITUATION IN
WHICH HEAT-RELATED ILLNESSES ARE POSSIBLE...ESPECIALLY FOR THOSE
LIVING IN UN-AIR CONDITIONED HOMES OR APARTMENTS. PEOPLE IN THE
ADVISORY AREA ARE ADVISED TO AVOID POORLY VENTILATED AREAS AND
PROLONGED WORK IN THE SUN. ALSO...KEEP PLENTY OF LIQUIDS ON HAND
AND TRY TO STAY IN AN AIR CONDITIONED ENVIRONMENT.

&&

$$

KANOFSKY
049 
WWUS73 KLSX 190838
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
338 AM CDT TUE JUL 19 2016

ILZ100>102-MOZ061-063>065-192200-
/O.CON.KLSX.EH.W.0001.000000T0000Z-160723T0000Z/
JEFFERSON MO-MADISON IL-MONROE IL-SAINT CHARLES MO-SAINT CLAIR IL-
SAINT LOUIS CITY MO-SAINT LOUIS MO-
INCLUDING THE CITIES OF...ALTON...BELLEVILLE...CAHOKIA...
EDWARDSVILLE...SAINT CHARLES...SAINT LOUIS
338 AM CDT TUE JUL 19 2016

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM CDT
FRIDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH 
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...AROUND 105 DEGREES TODAY AND WEDNESDAY...AND
  UP TO 111 THURSDAY AND FRIDAY DUE TO TEMPERATURES IN THE MID TO
  UPPER 90S...AND DEWPOINTS IN THE MID 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS.

PEOPLE IN THE SAINT LOUIS METROPOLITAN AREA CAN GET INFORMATION
ABOUT COOLING CENTERS OR ENERGY ASSISTANCE RELATED TO THE
EXCESSIVE HEAT BY CALLING THE UNITED WAY OF GREATER SAINT LOUIS AT
800-427-4626...OR IF CALLING FROM A LAND LINE PHONE DIAL 2-1-1. 
YOU CAN ALSO CALL COOL DOWN SAINT LOUIS AT 314-241-7668.

&&

$$

MOZ041-047-048-192200-
/O.CON.KLSX.EH.W.0001.000000T0000Z-160723T0000Z/
BOONE MO-COLE MO-MONITEAU MO-
INCLUDING THE CITIES OF...COLUMBIA...JEFFERSON CITY
338 AM CDT TUE JUL 19 2016

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM CDT
FRIDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH 
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...UP TO 108 DUE TO TEMPERATURES IN THE MID TO UPPER
  90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS. 

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY HEAT
SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE IS AN
EMERGENCY...CALL 9-1-1 IMMEDIATELY.

&&

$$

ILZ058>060-064-065-069-070-074-079-095>099-MOZ018-019-026-027-
034>036-042-049>052-059-060-062-072>075-084-085-099-192200-
/O.CON.KLSX.HT.Y.0005.000000T0000Z-160723T0000Z/
ADAMS IL-AUDRAIN MO-BOND IL-BROWN IL-CALHOUN IL-CALLAWAY MO-
CLINTON IL-CRAWFORD MO-FAYETTE IL-FRANKLIN MO-GASCONADE MO-
GREENE IL-IRON MO-JERSEY IL-KNOX MO-LEWIS MO-LINCOLN MO-
MACOUPIN IL-MADISON MO-MARION IL-MARION MO-MONROE MO-
MONTGOMERY IL-MONTGOMERY MO-OSAGE MO-PIKE IL-PIKE MO-RALLS MO-
RANDOLPH IL-REYNOLDS MO-SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-
SHELBY MO-WARREN MO-WASHINGTON IL-WASHINGTON MO-
INCLUDING THE CITIES OF...BOWLING GREEN...CENTRALIA...CHESTER...
FARMINGTON...FULTON...HANNIBAL...LITCHFIELD...MEXICO...
MOUNT STERLING...PITTSFIELD...QUINCY...SALEM...SPARTA...
SULLIVAN...UNION...VANDALIA...WASHINGTON
338 AM CDT TUE JUL 19 2016

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT FRIDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 100 DEGREES EACH 
  AFTERNOON THROUGH FRIDAY.

* HEAT INDEX VALUES...BETWEEN 100 AND 107 DUE TO TEMPERATURES IN
  THE MID TO UPPER 90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES AND HIGH
HUMIDITY WILL OCCUR. THIS COMBINATION WILL CREATE A SITUATION IN
WHICH HEAT-RELATED ILLNESSES ARE POSSIBLE...ESPECIALLY FOR THOSE
LIVING IN UN-AIR CONDITIONED HOMES OR APARTMENTS. PEOPLE IN THE
ADVISORY AREA ARE ADVISED TO AVOID POORLY VENTILATED AREAS AND
PROLONGED WORK IN THE SUN. ALSO...KEEP PLENTY OF LIQUIDS ON HAND
AND TRY TO STAY IN AN AIR CONDITIONED ENVIRONMENT.

&&

$$

CARNEY
805 
WWUS73 KLSX 192055
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
355 PM CDT TUE JUL 19 2016

ILZ100>102-MOZ061-063>065-201000-
/O.EXT.KLSX.EH.W.0001.000000T0000Z-160724T0000Z/
JEFFERSON MO-MADISON IL-MONROE IL-SAINT CHARLES MO-SAINT CLAIR IL-
SAINT LOUIS CITY MO-SAINT LOUIS MO-
INCLUDING THE CITIES OF...ALTON...BELLEVILLE...CAHOKIA...
EDWARDSVILLE...SAINT CHARLES...SAINT LOUIS
355 PM CDT TUE JUL 19 2016

...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 7 PM CDT SATURDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH
  AFTERNOON THROUGH SATURDAY.

* HEAT INDEX VALUES...UP TO 111 DUE TO TEMPERATURES IN THE UPPER 
  90S...AND DEWPOINTS IN THE MID 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS.

PEOPLE IN THE SAINT LOUIS METROPOLITAN AREA CAN GET INFORMATION
ABOUT COOLING CENTERS OR ENERGY ASSISTANCE RELATED TO THE
EXCESSIVE HEAT BY CALLING THE UNITED WAY OF GREATER SAINT LOUIS
AT 800-427-4626...OR IF CALLING FROM A LAND LINE PHONE DIAL 2-1-
1. YOU CAN ALSO CALL COOL DOWN SAINT LOUIS AT 314-241-7668.

&&

$$

MOZ041-047-048-201000-
/O.EXT.KLSX.EH.W.0001.000000T0000Z-160724T0000Z/
BOONE MO-COLE MO-MONITEAU MO-
INCLUDING THE CITIES OF...COLUMBIA...JEFFERSON CITY
355 PM CDT TUE JUL 19 2016

...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 7 PM CDT SATURDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH
  AFTERNOON THROUGH SATURDAY.

* HEAT INDEX VALUES...BETWEEN 105 AND 110 DUE TO TEMPERATURES IN
  THE UPPER 90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9-1-1 IMMEDIATELY.

&&

$$

ILZ058>060-064-065-069-070-074-079-095>099-MOZ018-019-026-027-
034>036-042-049>052-059-060-062-072>075-084-085-099-201000-
/O.EXT.KLSX.HT.Y.0005.000000T0000Z-160724T0000Z/
ADAMS IL-AUDRAIN MO-BOND IL-BROWN IL-CALHOUN IL-CALLAWAY MO-
CLINTON IL-CRAWFORD MO-FAYETTE IL-FRANKLIN MO-GASCONADE MO-
GREENE IL-IRON MO-JERSEY IL-KNOX MO-LEWIS MO-LINCOLN MO-
MACOUPIN IL-MADISON MO-MARION IL-MARION MO-MONROE MO-
MONTGOMERY IL-MONTGOMERY MO-OSAGE MO-PIKE IL-PIKE MO-RALLS MO-
RANDOLPH IL-REYNOLDS MO-SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-
SHELBY MO-WARREN MO-WASHINGTON IL-WASHINGTON MO-
INCLUDING THE CITIES OF...BOWLING GREEN...CENTRALIA...CHESTER...
FARMINGTON...FULTON...HANNIBAL...LITCHFIELD...MEXICO...
MOUNT STERLING...PITTSFIELD...QUINCY...SALEM...SPARTA...
SULLIVAN...UNION...VANDALIA...WASHINGTON
355 PM CDT TUE JUL 19 2016

...HEAT ADVISORY NOW IN EFFECT UNTIL 7 PM CDT SATURDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 100 DEGREES EACH
  AFTERNOON THROUGH SATURDAY.

* HEAT INDEX VALUES...BETWEEN 100 AND 110 DUE TO TEMPERATURES IN
  THE MID TO UPPER 90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES AND HIGH
HUMIDITY WILL OCCUR. THIS COMBINATION WILL CREATE A SITUATION IN
WHICH HEAT-RELATED ILLNESSES ARE POSSIBLE...ESPECIALLY FOR THOSE
LIVING IN UN-AIR CONDITIONED HOMES OR APARTMENTS. PEOPLE IN THE
ADVISORY AREA ARE ADVISED TO AVOID POORLY VENTILATED AREAS AND
PROLONGED WORK IN THE SUN. ALSO...KEEP PLENTY OF LIQUIDS ON HAND
AND TRY TO STAY IN AN AIR CONDITIONED ENVIRONMENT.

&&

$$

GKS
994 
WWUS73 KLSX 200839
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
339 AM CDT WED JUL 20 2016

ILZ058>060-064-065-069-070-074-079-095>099-MOZ018-019-026-027-
034>036-042-049>052-059-060-062-072>075-084-085-099-202200-
/O.UPG.KLSX.HT.Y.0005.000000T0000Z-160724T0000Z/
/O.EXA.KLSX.EH.W.0001.000000T0000Z-160724T0000Z/
ADAMS IL-AUDRAIN MO-BOND IL-BROWN IL-CALHOUN IL-CALLAWAY MO-
CLINTON IL-CRAWFORD MO-FAYETTE IL-FRANKLIN MO-GASCONADE MO-
GREENE IL-IRON MO-JERSEY IL-KNOX MO-LEWIS MO-LINCOLN MO-
MACOUPIN IL-MADISON MO-MARION IL-MARION MO-MONROE MO-
MONTGOMERY IL-MONTGOMERY MO-OSAGE MO-PIKE IL-PIKE MO-RALLS MO-
RANDOLPH IL-REYNOLDS MO-SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-
SHELBY MO-WARREN MO-WASHINGTON IL-WASHINGTON MO-
INCLUDING THE CITIES OF...BOWLING GREEN...CENTRALIA...CHESTER...
FARMINGTON...FULTON...HANNIBAL...LITCHFIELD...MEXICO...
MOUNT STERLING...PITTSFIELD...QUINCY...SALEM...SPARTA...
SULLIVAN...UNION...VANDALIA...WASHINGTON
339 AM CDT WED JUL 20 2016

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED AN EXCESSIVE
HEAT WARNING...WHICH IS IN EFFECT UNTIL 7 PM CDT SATURDAY. THE
HEAT ADVISORY IS NO LONGER IN EFFECT.

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 100 DEGREES EACH 
  AFTERNOON THROUGH SATURDAY.

* HEAT INDEX VALUES...UP TO 110 DUE TO TEMPERATURES AROUND 100...
   AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS. PEOPLE IN THE WARNING AREA ARE ADVISED TO AVOID
POORLY VENTILATED AREAS AND PROLONGED WORK IN THE SUN. USE AIR
CONDITIONING IN YOUR HOUSE OR APARTMENT IF IT IS WORKING
CORRECTLY. IF YOU DO NOT HAVE AIR CONDITIONING...KEEP YOUR HOUSE
OR APARTMENT WELL VENTILATED WITH FANS...AND TRY TO SPEND SOME
TIME IN AN AIR CONDITIONED ENVIRONMENT TO GIVE YOUR BODY A BREAK
FROM THE HEAT.

&&

$$

ILZ100>102-MOZ061-063>065-202200-
/O.CON.KLSX.EH.W.0001.000000T0000Z-160724T0000Z/
JEFFERSON MO-MADISON IL-MONROE IL-SAINT CHARLES MO-SAINT CLAIR IL-
SAINT LOUIS CITY MO-SAINT LOUIS MO-
INCLUDING THE CITIES OF...ALTON...BELLEVILLE...CAHOKIA...
EDWARDSVILLE...SAINT CHARLES...SAINT LOUIS
339 AM CDT WED JUL 20 2016

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM CDT
SATURDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH 
  AFTERNOON THROUGH SATURDAY.

* HEAT INDEX VALUES...UP TO 111 DUE TO TEMPERATURES IN THE UPPER 
  90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS.

PEOPLE IN THE SAINT LOUIS METROPOLITAN AREA CAN GET INFORMATION
ABOUT COOLING CENTERS OR ENERGY ASSISTANCE RELATED TO THE
EXCESSIVE HEAT BY CALLING THE UNITED WAY OF GREATER SAINT LOUIS
AT 800-427-4626...OR IF CALLING FROM A LAND LINE PHONE DIAL 2-1-
1. YOU CAN ALSO CALL COOL DOWN SAINT LOUIS AT 314-241-7668.

&&

$$

MOZ041-047-048-202200-
/O.CON.KLSX.EH.W.0001.000000T0000Z-160724T0000Z/
BOONE MO-COLE MO-MONITEAU MO-
INCLUDING THE CITIES OF...COLUMBIA...JEFFERSON CITY
339 AM CDT WED JUL 20 2016

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM CDT
SATURDAY...

* TIMING...HEAT INDEX VALUES WILL RISE ABOVE 105 DEGREES EACH 
  AFTERNOON THROUGH SATURDAY.

* HEAT INDEX VALUES...UP TO 108 DUE TO TEMPERATURES IN THE UPPER 
  90S...AND DEWPOINTS IN THE LOWER 70S.

* IMPACTS...THE COMBINATION OF HOT TEMPERATURES AND HIGH 
  HUMIDITY WILL LIKELY LEAD TO AN INCREASED RISK OF HEAT-RELATED 
  STRESS AND ILLNESS. THE VERY YOUNG...THE ELDERLY...THOSE 
  WITHOUT AIR CONDITIONING...AND THOSE PARTICIPATING IN 
  STRENUOUS OUTDOOR ACTIVITIES WILL BE THE MOST SUSCEPTIBLE. 
  ALSO...CAR INTERIORS CAN REACH LETHAL TEMPERATURES IN A MATTER 
  OF MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES AND HIGH HUMIDITY WILL OCCUR. IN
ADDITION...NIGHTTIME CONDITIONS WILL REMAIN WARM AND MUGGY
PROVIDING LITTLE CHANCE FOR RELIEF. THIS COMBINATION WILL CREATE
A DANGEROUS SITUATION IN WHICH HEAT-RELATED ILLNESSES ARE
LIKELY...ESPECIALLY FOR THOSE LIVING IN UN-AIR CONDITIONED HOMES
OR APARTMENTS.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9-1-1 IMMEDIATELY.

&&

$$

CARNEY

What forecasters said that day

The local office's own words before this heat advisory went out, 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 this heat advisory went out at Jul 18, 3:25 AM CDT, 29 minutes earlier.

Area forecast discussion, Jul 18, 3:25 AM CDT, 29 minutes before
Area Forecast Discussion
National Weather Service Saint Louis MO
325 AM CDT MON JUL 18 2016

.SHORT TERM...  (Through Late This Afternoon)
Issued at 323 AM CDT Mon Jul 18 2016

Main concern is the heat both today and through this week.  We will
be issuing a heat advisory starting today for the entire area.

Very warm conditions are expected today as forecast soundings are
showing mixing up to 750mb which supports going with highs near the
warmer GFS highs in most areas.  While thunderstorms may initially
hold down temperatures early in the day, there should be enough time
for heating for temperatures to recover. Dewpoints are already in
the lower to mid 70s and they are not expected change much during
the day. The combination of warm temperatures and dewpoints will
yield heat index values of 100 to 105 today.

Complex of storms over northern Missouri/southern Iowa will continue
to move eastward as 30kt low level jet veers eastward with time
early this morning.  Consequently, forward propagating Corfidi
vectors are showing that these storms should move across northeast
Missouri into west central Illinois around 12Z.  Still appears that
frontal boundary currently across Iowa and northern Illinois will
move slowly south and be in central Missouri and southern Illinois
by late tonight.  Atmosphere will become very unstable by this
afternoon across southwest and south central Illinois with little in
the way of capping.  The HRRR is showing some scattered
thunderstorms developing during the afternoon in an area with deep
layer shear around 25kts which favors a few strong or possibly
severe storms this afternoon and evening.  The chance for storms
will slowly shift into eastern Missouri as the front moves southwest
tonight.

Carney

.LONG TERM...  (Tonight through Sunday)
Issued at 323 AM CDT Mon Jul 18 2016

We will be on the eastern periphery of the upper level ridge on
Tuesday.  High pressure over the Great Lakes will try to push a
backdoor cold front west across Illinois, but current indications
are that it won't get much further than Bloomington, or perhaps
Springfield.  However, there may be some relief from the heat in the
form of thunderstorms.  Both the GFS and NAM are showing a broad are
of low level moisture convergence across much of Illinois and
eastern Missouri with corresponding QPF over those areas as well.
MLCAPE Tuesday afternoon between 2500 and 3000 J/Kg due to steamy
boundary layer should be an excellent environment for thunderstorms,
but there is a bit of CINH over the area.  Both the GFS and NAM are
printing out precip, but neither have been performing particularly
well recently with respect to precip due to grid-scale convective
feedback issues.  There is some evidence of convective feedback up
over Iowa from an MCS the night before...and the corresponding omega
bullseye migrates across Illinois on northwest flow aloft.  This may
be the trigger for storms Tuesday afternoon, or it could be a
figment of the NAM's and GFS's imagination. ECMWF seems to have
been handling the mass fields much better lately, and doesn't have
nearly the areal coverage or amount of precip that the U.S. models
do. Will therefore lean toward warmer highs and lower PoPs for
Tuesday, and correspondingly warmer lows and lower PoPs for
Tuesday night.

Upper level ridge builds overhead Wednesday and continues to expand
through the end of the week.  This should effectively squash most
convection through Saturday. Can't rule out some isolated
thunderstorms Wednesday afternoon or evening in our eastern zones
where the ridge will be a little weaker, or over the Ozarks where
orography will help get some stronger updrafts going. The bigger
story should be the heat. 850mb temps build through the low into
the mid 20s Wednesday through Saturday. 2m dewpoints are forecast
to stay in the 72-78 range through the period...with perhaps a
little mixing during the afternoon to dry out. However, with air
temperatures topping out in the mid and even upper 90s toward the
end of the week, it won't take abnormally high dewpoint
temperatures to get heat index values in the 100+ range. The only
reason we aren't extending the heat advisory through Saturday is
that it's possible thunderstorms ahead of a cold front could keep
us cooler than forecast. Medium range guidance pushes the cold
front through the area either late Saturday (ECMWF) or Sunday
(GFS). One way or another, that should be the end of this heat
wave.

One final thought:  The duration of this event necessitates special
attention.  Heat stress will continually build through the end of
the week and people need to take precautions to stay healthy.  The
heat wave actually started yesterday with heat index values in
excess of 100 degrees. Thursday and Friday may well be the hottest
days of the week as current heat index forecasts exceed excessive
heat warning criteria.  This will be at least 6 days of heat index
in excess of 100 degrees, and an upgrade to the advisory to warning
seems likely at least for the St. Louis Metro area.  The only reason
we decided to go with an advisory this morning is uncertainty with
the dewpoint forecast that far out.

Carney

&&

.AVIATION...  (For the 06z TAFs through 06z Monday Night)
Issued at 1143 PM CDT Sun Jul 17 2016

Thunderstorms continue to form over eastern Nebraska and western
Iowa with a few skirting northwest MO. They have been making
little eastward progress before weakening over northcentral MO.
This should continue much of the night, thus will keep a tempo in
for UIN. Threat will continue in this area as the front becomes
more east-west along the MO/IA border. Will keep a VCTS in
through the morning.

Specifics for KSTL: Question is will any storms make it south to
STL. Doesn't look like it right now and there shouldn't be a major
change in the atmosphere to cause it to change overnight. Could be
a few storm popping up Monday afternoon but timing difficult so
will leave forecast dry and VFR for now.

JPK

&&

.PRELIMINARY POINT TEMPS/POPS...
Saint Louis     96  81  95  78 /  20  30  20  10
Quincy          91  72  93  74 /  30  30  30  10
Columbia        94  74  94  75 /  10  20  20  10
Jefferson City  96  74  95  75 /  10  10  20  10
Salem           92  73  93  75 /  30  30  30  10
Farmington      93  73  94  74 /  10  10  20  10

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory from noon today to 7 PM CDT Friday for Audrain MO-
     Boone MO-Callaway MO-Cole MO-Crawford MO-Franklin MO-
     Gasconade MO-Iron MO-Jefferson MO-Knox MO-Lewis MO-Lincoln
     MO-Madison MO-Marion MO-Moniteau MO-Monroe MO-Montgomery MO-
     Osage MO-Pike MO-Ralls MO-Reynolds MO-Saint Charles MO-
     Saint Francois MO-Saint Louis City MO-Saint Louis MO-Sainte
     Genevieve MO-Shelby MO-Warren MO-Washington MO.

IL...Heat Advisory from noon today to 7 PM CDT Friday for Adams IL-
     Bond IL-Brown IL-Calhoun IL-Clinton IL-Fayette IL-Greene IL-
     Jersey IL-Macoupin IL-Madison IL-Marion IL-Monroe IL-
     Montgomery IL-Pike IL-Randolph IL-Saint Clair IL-Washington
     IL.

&&

WFO LSX
Hazardous weather outlook, Jul 17, 3:58 PM CDT, 11 hours 56 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
358 PM CDT SUN JUL 17 2016

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-181200-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-SAINT CLAIR IL-MONROE IL-KNOX MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-SAINT CHARLES MO-FRANKLIN MO-
SAINT LOUIS MO-SAINT LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
358 PM CDT SUN JUL 17 2016

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

.DAY ONE...TONIGHT

A FEW STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE TONIGHT. THE
MAIN THREATS ARE LARGE HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A FEW STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE OVER PARTS OF
THE AREA ON MONDAY AND TUESDAY.

HEAT INDEX VALUES BETWEEN 100 AND 107 DEGREES ARE POSSIBLE OVER
PARTS OF MISSOURI AND ILLINOIS EACH DAY THIS WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TONIGHT ACROSS PARTS OF
NORTHEASTERN MISSOURI AND WEST CENTRAL ILLINOIS.

KANOFSKY

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 18, 11:15 AM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles45 min
Jul 18, 4:04 PM CDTExcessive Heat WarningLSXAudrain, Boone, Callaway, Cole, Crawford, Franklin and 23 more6 days

Nearby

Heat Advisories in Missouri, 2016Heat Advisories in Illinois, 2016Every heat advisory in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.