Frost and Freeze Program has resumed normal operations
The Milwaukee/Sullivan National Weather Service resumed issuing Frost Advisories, as needed, for this spring season on May 1st. We began issuing Freeze Warnings (as needed) back on March 23, 2012 in response to the record warmth. In March, south-central and southeast Wisconsin experienced a prolonged period of exceptionally warm weather which resulted in many new daily and monthly temperature records across southern Wisconsin.
The abnormally warm weather resulted in the budding and/or blooming of trees, shrubs, and many flowers at least 2 to 4 weeks ahead of schedule. Climatologically, south-central and southeast Wisconsin can experience frost and/or freeze conditions well into May. To view a map of the average dates of the last freezing temperatures, click here. This map was produced by the Midwestern Regional Climate Center.
The quick start to the growing season, consequently, forced the National Weather Service in Milwaukee to begin our spring-season Frost Advisory and Freeze Warning program earlier than normal. The situation was discussed with the UW Ag Extension service, and they agreed that it would be wise to start the program.
Now that we are reaching the median date for the last freezing temperatures of the spring season, the National Weather Service in Milwaukee/Sullivan has resumed our normal Frost and Freeze Program. We will issue Frost Advisories when weather conditions favor the formation of areas to widespread frost. Typically this occurs when temperatures fall into the middle 30s or less, with light winds and higher relative humidity.
Freeze warnings will be issued when temperatures are expected to fall into the upper 20s or colder, and winds of 6 mph or more would prevent significant frost formation.