St. Louis, MO Weather Alerts

* WHAT...Sub-freezing temperatures as low as 29.

* WHERE...Portions of south central and southwest Illinois and east
central and southeast Missouri.

* WHEN...Until 9 AM CDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

* WHAT...Sub-freezing temperatures as low as 28 expected.

* WHERE...Southwest Illinois and southeast Missouri including the St
Louis area.

* WHEN...From midnight tonight to 7 AM CDT Thursday.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

* WHAT...Sub-freezing temperatures as low as 28 expected.

* WHERE...Southwest Illinois and southeast Missouri including the St
Louis area.

* WHEN...From midnight tonight to 7 AM CDT Thursday.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Portions of south central and southwest Illinois and east
central and southeast Missouri.

* WHEN...Until 9 AM CDT this morning.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.

* WHAT...Temperatures as low as 32 will result in frost formation.

* WHERE...Portions of south central and southwest Illinois and east
central and southeast Missouri.

* WHEN...From 1 AM to 9 AM CDT Wednesday.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Portions of south central and southwest Illinois and east
central and southeast Missouri.

* WHEN...From 1 AM to 9 AM CDT Wednesday.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.

* WHAT...Heat index values up to 105.

* WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL
Counties. In Missouri, Franklin MO, Jefferson MO, Saint Charles
MO, Saint Louis City MO, and Saint Louis MO Counties.

* WHEN...Until 6 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.

The St. Louis Clean Air Partnership has issued an air quality alert
for the St. Louis metropolitan area from 10 AM to 8 PM CDT Thursday.

An Orange air quality forecast means that maximum ozone
concentrations are expected to reach levels that pose a health risk.
Adverse health effects increase as air quality deteriorates. Ground-
level ozone is an air contaminant which can cause breathing
difficulties for children, older adults, as well as persons with
respiratory problems.

Reducing outdoor physical activity is recommended. If it is a
regularly scheduled work day you are urged to consider
telecommuting, carpooling, or utilizing public transit. Avoid
excessive idling and do not top off when refueling motor vehicles.
The use of gasoline-powered lawn equipment should be reduced or
postponed until late in the day.

For more information visit the St. Louis Clean Air Partnership at
http://cleanair-stlouis.com/

For current Air Quality Index (AQI) values visit
https://www.airnow.gov/

* WHAT...Heat index values up to 102.

* WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL
Counties. In Missouri, Franklin MO, Jefferson MO, Saint Charles
MO, Saint Louis City MO, and Saint Louis MO Counties.

* WHEN...Until 6 PM CDT Friday.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.

* WHAT...Heat index values up to 102.

* WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL
Counties. In Missouri, Franklin MO, Jefferson MO, Saint Charles
MO, Saint Louis City MO, and Saint Louis MO Counties.

* WHEN...Until 6 PM CDT Friday.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.