Update 6 p.m.
A tornado warning has been issued for an area of the Twin Cities including Coon Rapids, Blaine, and Andover.
The warning is in place until 6:30 p.m. after a storm system erupted to the west of the metro and strengthened as it moved northeast.
The National Weather Service says that tornado activity is radar indicated and that lime-sized hail is possible.
The area of the warning covers a population of almost 180,000.
A further warning until 6:45 p.m. was then issued for an area to the northeast of the metro, including Hugo, Forest Lake, Scandia, and Marine-On-Saint-Croix.
Update 4 p.m.
A severe thunderstorm watch has been issued until 11 p.m. Saturday for central and northern parts of Minnesota, including the Twin Cities metro area.
Storms are expected to develop rapidly this afternoon and be capable of producing tornadoes, hail the size of limes and damaging winds up to 70 mph.
The tornado threat, per the Storm Prediction Center, will be highest in the early stages of the storm developing. Once they congeal into a line, the main hazard will shift to a damaging wind threat.