Rain and Snow: October 21st - 23rd

Several low pressure systems affected the Upper Mississippi River Valley Region beginning on Wednesday, October 21st and continuing through early Saturday morning, October, 24th.  HIgh rainfall totals, along with some record snowfalls were observed across the area throughout this time.

Wednesday, October 21st

Rain began on early Wednesday morning as moist air rode over a warm front that was situated south of the local area, across Iowa and into southern Wisconsin.  Then, as the day progressed, an area of surface low pressure pushed north and east along the front, which further enhanced the development of precipitation.  The majority of the region did see rainfall throughout the day, but as the rain generally fell in locatiions along and north of the front and surface low, the higher rainfall amounts were seen across southern Minnesota into central Wisconsin.  The surface low did move eastward on Wednesday night, which allowed for the front to drop south into southern Iowa and northern Illinois, which in turn let the area of rainfall also drop southward through the night.  Rainfall amounts over the 24 hour period from 7 am Wednesday through 7 am Thursday bested three-quarters of an inch over most of these areas, with amounts reaching over 2 inches in localized areas.  These higher amounts were seen in conjunction with a cluster of thunderstorms that tracked from the Austin, Minnesota and St. Ansgar, Iowa areas through southeast Minnesota through Winona, and then north of La Crosse, Wisconsin through Black River Falls and then towards the Marshfield and Wisconsin Rapids areas. 

   

 Observed 24-Hour Rainfall

 Radar Estimated 24-Hour Rainfall

Thursday, October, 22nd

Areas across southeast Minnesota and into central Wisconsin enjoyed a dry day on Thursday as the frontal boundary remained well south of the area.  Meanwhile though, another area of low pressure began to push northeast out of the Central Plains.  Moisture pushing northward ahead of this system advanced far enough to keep rain falling through the day across much of Iowa and into southern Wisconsin.  The center of this system did push into northern Illinois on Thursday night, which did cause the rain to spread northward across the whole area through the evening and overnight hours.  Again, some high rainfall amounts were recorded, mainly in locations where the rain persisted through the entire 24 hour period.  Here, widespread amounts in excess of an inch were observed, with some localized areas even seeing amounts around 2 inches.

   

 Observed 24-Hour Rainfall

 Radar Estimated 24-Hour Rainfall

Friday, October, 23rd

The area of low pressure intensified during the day on Friday and pushed northward across eastern Wisconsin and over northern Lake Michigan.  Ample moisture continued to circulate around the low, which continued the precipitation across the entire forecast area throughout the day.  Cold air moving into the region was integrated into the system and led to the rain mixing with snow at times.  Although the majority of the area did not see accumulating snow, a compact and enhanced area of forcing aloft in the atmosphere caused precipitation to completely change over to snow and to fall at a very intense rate for several hours during the late morning and early afternoon hours.  This in turn brought about quick snowfall accumulations along a narrow corridor from southeast Minnesota into central Wisconsin, with amounts of up to 2 to 4 inches observed in some locations along this corridor.

Observed 24-Hour Rainfall

Observed 24-Hour Snowfall

Radar Estimated 24-Hour Precipitation

 

With the high amounts of precipitation that fell over these 3 days, area rivers, streams, and creeks saw rises, although no flooding was observed.  Also, with widespread rainfalll amounts in the 2 to 3 inch range, many locations surpased the mark of 5 inches during the month of October.  This is well above normal, as values average around 2 to 3 inches for the entire month.   Below is a listing of total observed rainfall amounts from October 21st through October 23rd.

...EVENT TOTAL RAINFALL AMOUNTS ACROSS THE AREA FROM TUESDAY EVENING
OCTOBER 20TH THROUGH THE MORNING OF SATURDAY OCTOBER 24TH...


LOCATION                        EVENT TOTAL    LAT/LON
                                RAINFALL

IOWA

...ALLAMAKEE COUNTY...
DORCHESTER HIGHWAY 76              2.20         43.42N 91.51W
ION                                1.95         43.11N 91.27W

...CHICKASAW COUNTY...
IONIA                              2.18         43.03N 92.50W

...CLAYTON COUNTY...
VOLGA                              3.04         42.81N 91.52W
ELKADER 6SSW                       2.74         42.79N 91.45W
LITTLEPORT                         2.42         42.75N 91.37W
ELKADER - TURKEY RIVER             2.51  1      42.84N 91.40W

...FAYETTE COUNTY...
OELWEIN AWOS                       2.98         42.68N 91.97W
FAYETTE                            2.80         42.85N 91.82W
OELWEIN 2W                         2.57         42.67N 91.97W
EL DORADO                          2.02         43.05N 91.81W

...FLOYD COUNTY...
NASHUA                             2.24         42.94N 92.57W
CHARLES CITY AWOS                  2.16         43.07N 92.61W
CHARLES CITY COOP                  1.98         43.08N 92.67W
COLWELL                            1.68         43.16N 92.59W

...HOWARD COUNTY...
CRESCO                             2.67         43.37N 92.11W
ELMA                               1.76         43.24N 92.44W

...WINNESHIEK COUNTY...
DECORAH AWOS                       2.80         43.28N 91.74W
CALMAR                             2.67         43.18N 91.87W
DECORAH 7ENE                       2.12         43.35N 91.65W
BLUFFTON                           1.81         43.41N 91.90W


MINNESOTA

...DODGE COUNTY...
DODGE CENTER                       2.30         44.04N 92.88W

...FILLMORE COUNTY...
HIGHLAND                           3.47         43.65N 91.84W
LANESBORO                          3.36         43.72N 91.97W
SPRING VALLEY                      3.30         43.69N 92.39W
CARIMONA                           3.30         43.66N 92.15W
SPRING VALLEY 1 NW                 3.28         43.70N 92.40W
SPRING VALLEY 3E                   3.10         43.68N 92.33W
HARMONY                            2.90         43.55N 92.01W

...HOUSTON COUNTY...
CALEDONIA 6S                       2.88         43.55N 91.51W
MOUND PRAIRIE                      2.88         43.78N 91.45W

...MOWER COUNTY...
GRAND MEADOW                       3.67         43.71N 92.56W
LANSING                            2.98         43.75N 92.95W
AUSTIN 3S                          2.58         43.67N 92.95W
AUSTIN - DOBBINS CREEK             2.42         43.67N 92.95W

...OLMSTED COUNTY...
ELBA                               3.19         44.05N 92.05W
ROCHESTER INTL AP                  2.87         43.91N 92.50W
ROCHESTER - CASCADE CRK            2.76         44.03N 92.48W
ROCHESTER - BEAR CRK               2.69         43.92N 92.48W
ROCHESTER - SILVER CRK             2.54         44.03N 92.42W
ROCHESTER BELTLINE                 2.29         43.91N 92.50W
ELGIN                              2.29         44.10N 92.27W
DOVER                              2.15         44.01N 92.11W
BYRON                              1.98         44.07N 92.66W

...WABASHA COUNTY...
THEILMAN                           2.28         44.28N 92.19W
KELLOGG                            1.93         44.32N 92.00W
LAKE CITY COOP                     1.81         44.43N 92.28W
ZUMBRO FALLS                       1.76         44.29N 92.42W

...WINONA COUNTY...
WINONA                             3.50         44.09N 91.67W
LA CRESCENT DAM 7                  3.35         43.87N 91.31W
ALTURA 5W                          2.66         44.06N 92.04W
MINNESOTA CITY                     2.23         44.16N 91.81W
ALTURA                             1.49         44.15N 92.01W


WISCONSIN

...BUFFALO COUNTY...
ALMA DAM 4                         2.44         44.33N 91.92W

...CLARK COUNTY...
NEILLSVILLE                        2.41         44.56N 90.61W
OWEN                               1.97         44.98N 90.55W

...CRAWFORD COUNTY...
STEUBEN                            2.51         43.18N 90.87W
SOLDIERS GROVE                     2.45         43.39N 90.78W
LYNXVILLE DAM 9                    1.64         43.21N 91.10W
STEUBEN 4SE                        1.33         43.13N 90.84W

...GRANT COUNTY...
SINSINAWA                          3.47         42.52N 90.54W
ROCKVILLE                          2.66         42.73N 90.64W
BOSCOBEL ASOS                      2.66         43.16N 90.68W
BURTON                             2.51         42.72N 90.82W
PLATTEVILLE AWOS                   1.75         42.69N 90.44W

...JACKSON COUNTY...
TAYLOR                             3.70         44.32N 91.12W
BLACK RIVER FALLS                  3.01         44.38N 90.84W

...JUNEAU COUNTY...
NECEDAH 5WNW                       2.56         44.06N 90.17W
NECEDAH 2SE                        2.48         44.00N 90.04W
NECEDAH 1W                         2.32         44.02N 90.08W
CAMP DOUGLAS                       1.90         43.94N 90.26W

...LA CROSSE COUNTY...
LA CROSSE 4NNW                     2.96         43.87N 91.27W
LA CROSSE ASOS                     2.85         43.88N 91.26W
LA CROSSE                          2.44         43.80N 91.37W
LA CROSSE WEATHER                  2.27         43.82N 91.19W
LA CROSSE 5SE                      2.17         43.77N 91.15W

...MONROE COUNTY...
FOUR CORNERS                       3.72         44.07N 90.92W
WARRENS                            3.59         44.10N 90.59W
TUNNEL CITY                        2.78         44.01N 90.57W
SPARTA                             2.61         43.94N 90.82W
WILTON                             2.58         43.82N 90.53W
SPARTA AWOS                        2.33         43.96N 90.74W

...RICHLAND COUNTY...
RICHLAND CENTER                    2.75         43.32N 90.38W
RICHLAND CENTER 1NW                2.44         43.36N 90.42W

...TAYLOR COUNTY...
GOODRICH                           1.87         45.15N 90.07W
MEDFORD                            1.72         45.13N 90.34W
MEDFORD 4NW                        1.31         45.18N 90.41W

...TREMPEALEAU COUNTY...
BLAIR 2NW                          3.18         44.31N 91.27W
TREMPEALEAU DAM 6                  2.80         44.00N 91.44W
GALESVILLE 1ESE                    2.70         44.06N 91.36W
OSSEO                              2.29         44.58N 91.22W

...VERNON COUNTY...

LA FARGE                           3.05         43.57N 90.64W
DE SOTO 1 SE                       2.66         43.41N 91.19W  
VALLEY 1NW                         2.60         43.66N 90.55W
VIROQUA                            2.40         43.55N 90.90W
WESTBY                             2.35         43.68N 90.81W
GENOA                              2.29         43.57N 91.23W
HILLSBORO                          2.21         43.65N 90.33W
ONTARIO                            1.53         43.72N 90.59W


OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING
EQUIPMENT AND EXPOSURE. NOT ALL DATA LISTED IS CONSIDERED OFFICIAL.


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