A storm system began to organize across the southern Rockies early April 17th, and moved quickly northeast across the Plains, and into the Upper Midwest by Thursday evening, April 18th. This was a typically Oklahoma Hooker which originated in southern Rockies, gained strength in the southern Plains, and moved rapidly north-northeast across Oklahoma, Missouri, Iowa, and into northern Wisconsin.
Initially, east central and southeast Minnesota, as well as west central Wisconsin were warm enough to see mostly sleet and rain during the onset of precipitation Thursday morning. As the system moved across southern Wisconsin, and into northern Wisconsin by the afternoon and evening, colder air changed the precipitation over to all snow from eastern Minnesota, into western Wisconsin.
As the storm intensified Thursday afternoon, the snow became heavy at times across central and south central Minnesota, with the sleet and snow, transitioning into all snow by the late afternoon across the Twin Cities, eastern Metro.  By the evening, most of eastern Minnesota had snow, with sleet and snow continuing across west central Wisconsin until late evening where the mixture changed over to all snow.
Snowfall rates during the late afternoon, and evening hours of Thursday, April 18th, were one to two inches per hour, with isolated three inch per hour rates.  Snowfall amounts quickly increased during the evening, with several areas already receiving 6 or more inches before 9 pm.
By Friday morning, as the snow tapered off to occasional flurries and snow showers, snowfall amounts ranged from 2 to 4 inches in southeast and south central Minnesota, to locally 12 to 15 inches in the western part of the Twin Cities Metro area, northward to St. Cloud and Mora. The highest total was near Elk River which received 15.3 inches from this storm.

Winter Storm in CHISAGO, MINNESOTA
From 18-APR-13 11:00:00 to 19-APR-13 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 10 to 12 inches across the county.

Winter Storm in RENVILLE, MINNESOTA
From 18-APR-13 08:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 6 to 8 inches across the county.

Winter Storm in TODD, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 8 to 10 inches across the eastern part of the county.

Winter Storm in SIBLEY, MINNESOTA
From 18-APR-13 09:00:00 to 18-APR-13 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 8 to 10 inches across the county.

Winter Storm in STEARNS, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 12 to 14 inches in the far southeast, to locally 6 to 8 inches in the far west.

Winter Storm in LE SUEUR, MINNESOTA
From 18-APR-13 09:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 7 to 9 inches across the county, with the heaviest in the northwest.

Winter Storm in BENTON, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 12 to 14 inches across the county.

Winter Storm in KANDIYOHI, MINNESOTA
From 18-APR-13 10:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 6 to 8 inches in the eastern part of the county.

Winter Storm in MORRISON, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 8 to 10 inches across the county.

Winter Storm in MEEKER, MINNESOTA
From 18-APR-13 10:00:00 to 18-APR-13 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 8 to 10 inches across the county.

Winter Storm in WRIGHT, MINNESOTA
From 18-APR-13 10:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 11 to 14 inches across the county.

Winter Storm in MILLE LACS, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 12 to 14 inches across the county.

Winter Storm in ISANTI, MINNESOTA
From 18-APR-13 11:00:00 to 19-APR-13 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 10 to 14 inches across the county.

Winter Storm in HENNEPIN, MINNESOTA
From 18-APR-13 10:00:00 to 19-APR-13 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 11 to 14 inches across the county.

Winter Storm in MCLEOD, MINNESOTA
From 18-APR-13 10:00:00 to 18-APR-13 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 9 to 11 inches across the county.

Winter Storm in SHERBURNE, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 12 to 14 inches across the county, with locally 15.3 inches near Elk River.

Winter Storm in KANABEC, MINNESOTA
From 18-APR-13 11:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 12 to 14 inches across the county.

Winter Storm in CARVER, MINNESOTA
From 18-APR-13 10:00:00 to 18-APR-13 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 10 to 12 inches across the county.

Winter Storm in SCOTT, MINNESOTA
From 18-APR-13 10:00:00 to 19-APR-13 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 7 to 9 inches across the county.

Winter Storm in WATONWAN, MINNESOTA
From 18-APR-13 08:00:00 to 18-APR-13 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts were heaviest in the northern part of the county with locally 10 inches near Madelia.

Winter Storm in BLUE EARTH, MINNESOTA
From 18-APR-13 08:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts were heaviest in the northern part of the county where locally 6 to 8 inches fell.

Winter Storm in DAKOTA, MINNESOTA
From 18-APR-13 10:00:00 to 19-APR-13 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 6 to 7 inches across the county, with the heaviest near the Minnesota River.

Winter Storm in RICE, MINNESOTA
From 18-APR-13 10:00:00 to 19-APR-13 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 6 to 7 inches in the far northwest part of the county.

Winter Storm in RAMSEY, MINNESOTA
From 18-APR-13 10:00:00 to 19-APR-13 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 7 to 9 inches across the county.

Winter Storm in BROWN, MINNESOTA
From 18-APR-13 08:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 8 to 10 inches across the county.

Winter Storm in NICOLLET, MINNESOTA
From 18-APR-13 08:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 8 to 10 inches across the county.

Winter Storm in WASHINGTON, MINNESOTA
From 18-APR-13 10:00:00 to 19-APR-13 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 6 to 8 inches across the county, with the heaviest in the far north.

Winter Storm in ANOKA, MINNESOTA
From 18-APR-13 11:00:00 to 19-APR-13 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 10 to 14 inches across the county.

Winter Storm in REDWOOD, MINNESOTA
From 18-APR-13 08:00:00 to 18-APR-13 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts ranged from 6 to 8 inches across the far eastern part of the county.