...WIND CHILL WARNING NOW IN EFFECT UNTIL 10 AM CST THURSDAY...
...WIND CHILL ADVISORY IN EFFECT FROM 10 AM TO NOON CST
THURSDAY...

* WHAT...Dangerously cold wind chills ongoing. Wind chills as low
  as 50 to 60 below zero this morning and today. Wind chills as
  low as 30 below zero expected tonight.

* WHERE...Central to northeastern Iowa.

* WHEN...Wind Chill Warning, until 10 AM CST Thursday. Wind Chill
  Advisory, from 10 AM to noon CST Thursday.

* ADDITIONAL DETAILS...The dangerously cold wind chills could
  cause frostbite on exposed skin in as little as 5 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Chill Warning means the combination of very cold air and
the wind will create dangerously low wind chill values. Frostbite
can occur quickly and even hypothermia or death if precautions
are not taken.