Some parts of Alabama are facing an extreme heat warning on Tuesday.

The National Weather Service issues extreme heat warnings when the combination of air temperatures and humidity reaches a certain point that makes it extremely hazardous for those not taking proper precautions.

A large part of north Alabama finds itself under an extreme heat warning today.

The criteria for extreme heat warnings vary by region, but the National Weather Service in Huntsville said for north Alabama the extreme heat warning thresholds are 110+ heat index temperatures.

(A heat advisory is 105+ degree heat indices.)

The weather service said Tuesday that part of north Alabama was upgraded to an extreme heat warning because of increased confidence of more widespread 110+ degree heat indices in that area.

Huntsville and Muscle Shoals were some of the hottest spots in Alabama on Monday. Both had high temperatures of 98 degrees on Monday.

Both cities also set records on Monday for the highest low temperatures, according to the weather service.

Huntsville had a low temperature on Monday of 76 degrees, which tied the record for July 28 from 2022 and 2015.

Muscle Shoals had a low temperature of 77 degrees, which also tied its record for July 28 from 2022.

The rest of the state is not getting off easy, either, and is covered by heat advisories.

The National Weather Service is forecasting air temperatures to peak in the mid- to upper 90s again today across most of Alabama.

Here is today’s high temperature forecast:

However, add in humidity levels and it could feel much hotter — up to 112 degrees, according to the weather service.

There is some good news in the forecast. After today temperatures will back off, a little, and stay there for the rest of the week. There will also be better chances for rain.

Wednesday’s highs will still be in the 90s, but most areas will get lower 90s instead of upper 90s.

Here is the forecast for Wednesday:

Here is a look at the heat advisories and warnings in place for Alabama:

NORTH ALABAMA

An extreme heat warning will be in effect on Tuesday from 11 a.m. until 9 p.m. for the following counties: Limestone, Madison, Morgan, Colbert, Franklin, Lauderdale and Lawrence.

The weather service in Huntsville said heat index values of 110-112 degrees will be possible in those areas this afternoon.

The rest of north Alabama, including Cullman, DeKalb, Jackson and Marshall counties, is under a heat advisory from 11 a.m. until 9 p.m. Tuesday.

Heat index values up to 109 will be possible in those areas.

CENTRAL ALABAMA

A heat advisory will be in effect until 9 p.m. Tuesday for all of central Alabama.

The weather service in Birmingham said the heat index could peak at 109 degrees this afternoon across the region.

SOUTH ALABAMA

A heat advisory will be in effect for all of southwest and south-central Alabama from 10 a.m. until 6 p.m. Tuesday.

The counties in the advisory are Choctaw, Washington, Clarke, Wilcox, Monroe, Conecuh, Butler, Crenshaw, Escambia, Covington, Mobile and Baldwin counties.

The weather service in Mobile said the heat index could reach 109 degrees today in those areas.

For southeast Alabama, another heat advisory will be in effect from 11 a.m. until 6 p.m. CDT for Coffee, Dale, Geneva, Henry and Houston counties.

The weather service in Tallahassee, Fla., said heat index values up to 111 are expected in that corner of Alabama today.