May 20th Severe Weather Review

 
Synopsis:

A cold front moved across Iowa during the morning and afternoon of May 20th.  Ahead of this front, strong thunderstorms developed in a very unstable airmass and quickly developed into several strong supercells.  Some of the thunderstorms were severe, producing very large hail with hail sizes between the size of a quarter up to the size of a golf ball.  Torrential rains were also common with the stronger storms especially over Benton County Iowa.

 
Radar Loop
Click Image to Enlarge

 
Storm Reports

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
845 PM CDT TUE MAY 20 2014


Click Image for Interactive Map and Link for a list of reports.
 
Hail Pictures

 

Hail from the thunderstorms that moved through Monticello, Iowa at 630 PM on Tuesday.
Photo courtesy of Brian Porter.

 
Rainfall Map
 


24 hour precipitation reports (in Inches),
for eastern Iowa, northwest and west central Illinois,
and northeast Missouri. Reported between Midnight and 9 AM,
Wednesday May 21, 2014.

....IOWA....
Vinton                           1.99
Davenport 2.1 SW                 1.87
Davenport 0.9 SSW                1.76
Dubuque Arpt                     1.37
Bettendorf 2.2 SE                1.33
Cedar Rapids 2.1 ENE             1.29
Boone                            1.23
Ames US 30                       1.22
Central City 6.7 W               1.16
Marshalltown                     1.06
Cedar Rapids 3.4 NW              1.02
Anamosa 3 SSW                    0.99
Cedar Rapids Arpt                0.90
Newton                           0.89
Davenport Arpt                   0.87
Gilman                           0.85
Eldridge 0.6 ESE                 0.85
Dubuque #3                       0.85
Marshalltown ASOS                0.76
Bellevue 0.3 SSW                 0.76
Marion 1.2 NE                    0.73
Coggon                           0.66
Iowa City Arpt                   0.60
North Liberty 1.0 ENE            0.59
Beaconsfield                     0.54
Monticello                       0.53
Le Claire 1.8 NNE                0.47
Solon 0.3 ESE                    0.46
Oskaloosa AWOS                   0.45
Lowden                           0.45
Pella                            0.38
Iowa City                        0.38
Kalona 7.3 NNW                   0.34
Park View 0.2 WSW                0.27
Perry                            0.25
Belle Plaine                     0.24
NWS Johnston*                    0.21
Maquoketa 4W                     0.13
Calamus 2.0 NE                   0.11
Centerville                      0.11
Grinnell AWOS                    0.11
De Witt 4S                       0.10
Grinnell                         0.09
Cascade                          0.08
Washington                       0.06
Bloomfield                       0.06
Rathbun Reservoir                0.06
Albia                            0.03
CRESCO                           0.02
Delmar 2.3 NW                    0.02
Brighton                         0.01
Hampton                          0.01
Ottumwa ASOS                     0.01
Allerton                         0.01
Marengo                          0.01
Pella AWOS                       0.01
Marengo 2.6 SSW                  0.01
Clinton 1.7 W                    0.01
Tripoli                          0.00
Mason City ASOS                  0.00
Burlington Arpt                  0.00
Donnellson                       0.00
Fairfield                        0.00
Burlington 6.5 SSW               0.00
Stanley                          0.00
FAYETTE                          0.00
Waterloo ASOS                    0.00
New London 1.5 SW                0.00
ELKADER 6SSW                     0.00
Burlington 0.8 SSE               0.00
GUTTENBERG DAM 10                0.00
Muscatine 2N                     0.00
Keokuk 0.6 NE                    0.00
Mason City                       0.00
Keokuk LD19                      0.00
Ainsworth 7.4 N                  0.00
Keosauqua                        0.00
Manchester                       0.00
....ILLINOIS....
Orangeville 2.8 NW               0.98
Apple Rvr Cnyn SP                0.87
Atkinson 2.6 NNE                 0.86
Elizabeth                        0.70
Chadwick 2.7 WSW                 0.57
Galena                           0.55
St Charles                       0.48
Mount Carroll                    0.46
Davis 0.5 N                      0.43
Mendota                          0.39
Winslow 4.3 ESE                  0.33
Rockford ASOS                    0.32
Pearl City 0.4 SW                0.24
Mount Carroll 6.8 NNW            0.22
Roscoe 2SE                       0.18
Freeport 1.7 ESE                 0.13
Tiskilwa 2.1 N                   0.12
Freeport 2.0 NW                  0.11
Jacksonville AWOS                0.10
Freeport                         0.10
Mundelein                        0.09
Princeton 1.1 SE                 0.09
Princeton                        0.09
Monmouth 4NW                     0.08
Coal Valley 1.9 SE               0.07
Romeoville                       0.06
Rock Falls                       0.04
Quad City Arpt                   0.04
Rochelle                         0.04
Alexis                           0.03
Ottawa                           0.03
Morrison 3.2 E                   0.03
Joliet                           0.02
Steward                          0.02
Sterling 4.9 WSW                 0.02
Ill. City LD16                   0.01
Coleta 1.4 SSW                   0.00
Galesburg                        0.00
New Windsor 2.0 N                0.00
Aledo                            0.00
Dallas City 3.0 SSE              0.00
St David                         0.00
Decatur Airport                  0.00
Aledo 0.4 NE                     0.00
Carthage 0.8 E                   0.00
Bentley                          0.00
La Harpe                         0.00
Windsor                          0.00
Pontiac                          0.00
Rochelle AWOS                    0.00
Gladstone LD18                   0.00
Ripley                           0.00
Augusta                          0.00
Ogden                            0.00
Quincy Dam 21                    0.00
Havana                           0.00
Peoria ASOS                      0.00
New Boston LD17                  0.00
Colchester 3.5 NE                0.00
Edwardsville 2 W                 0.00
Greenville 2 NE                  0.00
Minonk                           0.00
Griggsville                      0.00
Quincy ASOS                      0.00
Macomb                           0.00
Beardstown                       0.00
St Anne                          0.00
Bloomington Airport              0.00
Tuscola                          0.00
Kewanee                          0.00
Prairie City 2S                  0.00
Winchester                       0.00
Lincoln NWS                      0.00
Altona                           0.00
....MISSOURI....
BROOKFIELD                       0.00
Memphis                          0.00
Hannibal                         0.00
Canton LD20                      0.00
LONG BRANCH RESERVOIR            0.00
California                       0.00
DOWNING                          0.00
BLUE LICK                        0.00
CHILLICOTHE                      0.00
KIRKSVILLE                       0.00
Kirksville ASOS                  0.00
Edina                            0.00
Columbia                         0.00
NWS Weldon Spring                0.00
....WISCONSIN....
BELOIT-9 NW                      0.49
BELOIT-COLLEGE                   0.10
DELAVAN-1 W-WWTP                 0.08
WHITEWATER                       0.07
WATERTOWN-AWOS                   0.03
PADDOCK LAKE                     0.03
Brodhead                         0.02
MADISON-ASOS                     0.01
ALLENTON-WWTP                    0.01
PRAIRIE DU CHIEN AWOS            0.00
VIROQUA                          0.00
SULLIVAN-NWS                     0.00
Darlington                       0.00
LANCASTER 4WSW                   0.00
LA CROSSE WFO                    0.00
DARLINGTON-2 NE                  0.00
....MINNESOTA....
CHANHASSEN  WFO                  0.00
PRESTON                          0.00
GRAND MEADOW                     0.00
BYRON 4N                         0.00
THEILMAN 1SSW                    0.00





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