The National Weather service has issued an excessive heat warning for this weekend. The watch goes into effect at 1 p.m. Friday, and is slated to last until 7 p.m. Tuesday.

During that time, temperatures are expected to be in the mid- to upper-90s or 100s. Heat indices will be up to 110 degrees. Temperatures at night are expected to be in the 70s.

Yesterday, the NWS had issued an excessive heat watch for this weekend. That watch is no longer in effect.

The warning covers a large area of northern Kansas, including the following counties:

• Douglas
• Jefferson
• Shawnee
• Osage
• Franklin
• Johnson
• Miami
• Leavenworth
• Wyandotte

For those of you wondering the difference between a heat watch and a heat warning, the NWS says that heat watches are issued when prolonged periods of high temperatures are expected. Heat warnings, however, are issued when the combination of high humidity and high temperature are expected to make it feel as though it is 110 degrees or hotter.