The National Weather Service has issued Severe Thunderstorm Watch
487 in effect until 2 am CDT Tuesday for the following areas
In Illinois this watch includes 7 counties
In southwest Illinois
Calhoun IL Greene IL Jersey IL
Macoupin IL Madison IL Monroe IL
St. Clair IL
In Missouri this watch includes 20 counties
In central Missouri
Audrain MO Boone MO Callaway MO
Cole MO Moniteau MO Osage MO
In east central Missouri
Crawford MO Franklin MO Gasconade MO
Jefferson MO Lincoln MO Montgomery MO
St. Charles MO St. Louis MO Warren MO
In northeast Missouri
In southeast Missouri
Iron MO St. Francois MO Ste. Genevieve MO
In Missouri this watch includes 1 independent city
In east central Missouri
St. Louis city MO
This includes the cities of... Belleville... Bowling Green...
Columbia... Edwardsville... Farmington... Jefferson City... Mexico...
St Charles... St Louis and Union.
... Safety rules for severe thunderstorms...
A Severe Thunderstorm Watch has been issued by the National
Weather Service. In the interest of public safety, the
following safety rules are provided. Public and commercial
broadcast stations serving the affected area are asked to
broadcast these safety measures frequently while the watch is
A Severe Thunderstorm Watch means conditions are favorable for
the development of severe thunderstorms in and close to the
watch area. If you are in the watch area, keep up to date of
the latest weather information. These storms can develop
rapidly so there may be occasions when advance warning is not
A Severe Thunderstorm Warning means a severe thunderstorm has
been observed or indicated on radar. If you are in the path
or near the storm, take immediate actions to protect life and
property. Follow these safety rules:
(1) in open country, you should seek shelter and avoid trees
which can be targets for lightning. If there is no shelter,
go to a ditch or culvert but beware of rising water which can
(2) when indoors, stay away from outside walls and windows
and go to an interior room on the lowest level. Avoid using
electrical appliances while the storm is nearby.
(3) in Mobile homes, you should leave and seek nearby safe
(4) if swimming or on a boat, you should get to shore as
quickly as possible and find shelter.
A thunderstorm is considered severe when it contains one inch
or larger diameter size hail and/or wind gusts of 58 miles an
hour or greater. A severe thunderstorm can also produce deadly
lightning and very heavy rain which can lead to flash flooding.
Remember, with any severe thunderstorm there is always the
possibility of tornadoes.