Hannibal Emergency Management

09/05/2026

Update: Extreme Heat Warning issued September 5 at 2:29AM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

Greene; Macoupin; Montgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Boone; Audrain; Moniteau; Cole; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; Franklin; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds

* WHAT...Dangerously hot conditions with heat index values up to 108.

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

* WHEN...Until 8 PM CDT this evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors. Young children and
pets should never be left unattended in vehicles under any
circumstances. Take extra precautions if you work or spend time
outside. When possible reschedule strenuous activities to early
morning or evening. Know the signs and symptoms of heat exhaustion
and heat stroke. Wear lightweight and loose fitting clothing when
possible. 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.

09/03/2026

Our ongoing heat wave will continue through at least Saturday across the entire area, with a medium chance that the Heat Advisory continues for portions of the area on Sunday. There is a low chance (20%) for rain Sunday and Monday, with a majority of the holiday weekend remaining dry.

09/03/2026

An Extreme Heat Warning is now in effect for the entire region through Saturday. Afternoon heat index values will top out around 105 degrees. Please take precautions!

08/30/2026

Heat Advisory issued August 30 at 12:27PM CDT until September 4 at 8:00PM CDT by NWS St Louis MO

Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Boone; Audrain; Moniteau; Cole; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; Franklin; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds

* WHAT...Heat index values of 100 to 105 expected, with morning low
temperatures of 70 to 78 degrees, for several consecutive days.

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

* WHEN...From noon Monday to 8 PM CDT Friday.

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

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

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.

08/14/2026

Heat Advisory issued August 14 at 4:03AM CDT until August 15 at 9:00PM CDT by NWS St Louis MO

Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Pike; Calhoun; Jersey; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Lincoln

* WHAT...Heat index values up to 109.

* WHERE...Portions of south central, southwest, and west central
Illinois and central, east central, and northeast Missouri.

* WHEN...Until 9 PM CDT Saturday.

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

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

08/13/2026

08/13/2026

Heat Advisory issued August 13 at 10:28AM CDT until August 15 at 9:00PM CDT by NWS St Louis MO

Pike; Shelby; Marion

* WHAT...Heat index values up to 109.

* WHERE...In Illinois, Pike IL County. In Missouri, Marion MO and
Shelby MO Counties.

* WHEN...Until 9 PM CDT Saturday.

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

08/09/2026

Heat Advisory issued August 9 at 1:05AM CDT until August 12 at 8:00PM CDT by NWS St Louis MO

Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Lincoln; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds

* WHAT...Heat index values up to 106 expected.

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

* WHEN...From noon today to 8 PM CDT Wednesday.

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

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors. Young children and
pets should never be left unattended in vehicles under any
circumstances. Take extra precautions if you work or spend time
outside. When possible reschedule strenuous activities to early
morning or evening. Know the signs and symptoms of heat exhaustion
and heat stroke. Wear lightweight and loose fitting clothing when
possible. 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.

07/29/2026

📢 New Outdoor Warning Siren Now Operational Near Oakwood School🚨

You may have heard us testing earlier... We’re happy to share that the new Outdoor Warning Siren serving the Oakwood School area is now installed and operational.

A special thank you to our partners at Blue Valley Public Safety and The Hannibal Board of Public Works for their hard work and collaboration in making this project a success.

07/24/2026

🔥☀️ EXTREME HEAT WATCH: SUNDAY – TUESDAY ☀️🔥
While recent temperatures have been relatively mild, a significant warming trend is expected to develop this weekend and continue into next week. An Extreme Heat Watch has been issued for much of the region, including Northeast Missouri. Conditions may become dangerous for anyone spending extended time outdoors. The National Weather Service advises residents to begin preparing now and have a plan to stay cool if warnings are issued.

Now is the time to prepare before the heat arrives.
✅ Stay Hydrated

Drink plenty of water throughout the day, even if you don't feel thirsty.
Limit alcohol and excessive caffeine, which can contribute to dehydration.

✅ Limit Outdoor Activities

Schedule outdoor work, exercise, and recreation during the early morning or evening hours.
Take frequent breaks in the shade or air conditioning.

✅ Check on Others

Older adults, young children, individuals with chronic medical conditions, and those without reliable air conditioning are at greater risk during extreme heat.
Check on neighbors, relatives, and friends, especially those who live alone.

✅ Know the Warning Signs

Heat exhaustion symptoms may include heavy sweating, dizziness, nausea, weakness, and headache.
Heat stroke is a medical emergency. Call 911 immediately if someone becomes confused, loses consciousness, or has a very high body temperature.

✅ Never Leave Children or Pets in Vehicles

Temperatures inside a parked vehicle can become deadly in minutes, even with windows cracked.

✅ Have a Cooling Plan

If your home is not adequately cooled, identify air-conditioned locations where you can safely spend time during the hottest parts of the day. An Extreme Heat Watch means now is the time to prepare.

The Hannibal Emergency Management Agency will continue monitoring conditions and will share additional updates as the event approaches. As we move from pleasant summer temperatures into potentially dangerous heat, a little preparation now can help keep you, your family, and your pets safe.