Severe Weather and Mammatus clouds on Mother's Day:
May 9, 2004

The severe weather on May 9th began with a single severe thunderstorm cell in west central Minnesota during the afternoon. More thunderstorms developed and formed a line as they moved east. By the evening hours the storms spread across the Twin Cities bringing gusty winds, small hail and welcome rains. The University of Minnesota St. Paul Campus Climate Observatory recorded a wind gust of 62mph. This is the highest peak gust recorded at the station since wind records began in 1990. What might be most remembered from this storm was the brilliant sunset shining on the mammmatus clouds hanging from the underside of the anvil of the thunderstorm. Mammatus clouds do not produce severe weather, but they often accompany severe thunderstorms. Many shutterbugs took photos of the clouds across the northern Twin Cities.

Mammatus clouds over U of M St Paul Campus. May 9, 2004

Listed below are some storm reports courtesy the National Weather Service.

PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
641 AM CDT MON MAY 10 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
             ..REMARKS..

1142 AM     HAIL             7 NE CLARKFIELD         44.86N 95.71W 
05/09/2004  2.00 INCH        YELLOW MEDICINE    MN   PUBLIC          

1142 AM     TSTM WND GST     7 NE CLARKFIELD         44.86N 95.71W 
05/09/2004  75 MPH           YELLOW MEDICINE    MN   PUBLIC          

1142 AM     TORNADO          7 NE CLARKFIELD         44.86N 95.71W 
05/09/2004                   YELLOW MEDICINE    MN   PUBLIC          

PUBLIC REPORT OF TORNADO PENDING INVESTIGATION. A SMALL 
SHED WAS DESTROYED. ESTIMATED ON THE GROUND FOR 1 MINUTE 
WITH 30 YARD WIDE PATH. 

0208 PM     HAIL             CHOKIO                  45.57N 96.17W 
05/09/2004  0.75 INCH        STEVENS            MN   LAW ENFORCEMENT 

0208 PM     HAIL             1 E CHOKIO              45.57N 96.15W 
05/09/2004  1.75 INCH        STEVENS            MN   LAW ENFORCEMENT 

0229 PM     HAIL             MORRIS                  45.59N 95.91W 
05/09/2004  0.88 INCH        STEVENS            MN   LAW ENFORCEMENT 

0230 PM     HAIL             8 N HOLLOWAY            45.36N 95.91W 
05/09/2004  1.00 INCH        SWIFT              MN   LAW ENFORCEMENT 

0250 PM     HAIL             13 S CYRUS              45.43N 95.74W 
05/09/2004  0.88 INCH        POPE               MN   PUBLIC          

0255 PM     HAIL             12 S STARBUCK           45.44N 95.53W 
05/09/2004  1.00 INCH        POPE               MN   LAW ENFORCEMENT 

ROAD SLIPPERY FROM HAIL. VERY HEAVY RAIN.

0258 PM     FUNNEL CLOUD     8 N WILLMAR             45.24N 95.05W 
05/09/2004                   KANDIYOHI          MN   AMATEUR RADIO   

0317 PM     HAIL             MURDOCK                 45.22N 95.39W 
05/09/2004  0.75 INCH        SWIFT              MN   TRAINED SPOTTER 

0320 PM     HAIL             MURDOCK                 45.22N 95.39W 
05/09/2004  1.75 INCH        SWIFT              MN   TRAINED SPOTTER 

0321 PM     HAIL             20 E BENSON             45.32N 95.20W 
05/09/2004  0.75 INCH        KANDIYOHI          MN   NWS EMPLOYEE    

0323 PM     HAIL             2 W BROOTEN             45.50N 95.16W 
05/09/2004  0.75 INCH        POPE               MN   LAW ENFORCEMENT 

0327 PM     HAIL             6 S BROOTEN             45.41N 95.12W 
05/09/2004  0.75 INCH        STEARNS            MN   TRAINED SPOTTER 

0330 PM     HAIL             2 W SUNBURG             45.35N 95.28W 
05/09/2004  1.00 INCH        SWIFT              MN   UNKNOWN         

0330 PM     HAIL             KERKHOVEN               45.19N 95.32W 
05/09/2004  1.00 INCH        SWIFT              MN   EMERGENCY MNGR  

0335 PM     HAIL             6 S BROOTEN             45.41N 95.12W 
05/09/2004  0.88 INCH        STEARNS            MN   AIRPLANE PILOT  

0335 PM     TSTM WND DMG     PENNOCK                 45.15N 95.18W 
05/09/2004                   KANDIYOHI          MN   BROADCAST MEDIA 

ROOF RIPPED OFF A TURKEY BARN ALONG ROUTE 12. 

0347 PM     HAIL             4 SE PAYNESVILLE        45.34N 94.66W 
05/09/2004  0.88 INCH        STEARNS            MN   TRAINED SPOTTER 

0355 PM     TSTM WND GST     WILLMAR                 45.12N 95.05W 
05/09/2004  60 MPH           KANDIYOHI          MN   AWOS            

0403 PM     HAIL             PAYNESVILLE             45.38N 94.72W 
05/09/2004  1.00 INCH        STEARNS            MN   EMERGENCY MNGR  

0403 PM     TSTM WND DMG     2 S PAYNESVILLE         45.35N 94.72W 
05/09/2004                   STEARNS            MN   TRAINED SPOTTER 

PONTOON BOAT BLOWN OFF OF LIFT.

0408 PM     HAIL             9 S PAYNESVILLE         45.25N 94.72W 
05/09/2004  1.00 INCH        MEEKER             MN   TRAINED SPOTTER 

0410 PM     TSTM WND DMG     5 SW WATKINS            45.26N 94.48W 
05/09/2004                   MEEKER             MN   TRAINED SPOTTER 

FISH HOUSE BLOWN OVER AND ROLLED 50 FEET. 

0413 PM     HAIL             EDEN VALLEY             45.33N 94.55W 
05/09/2004  0.75 INCH        STEARNS            MN   LAW ENFORCEMENT 

0414 PM     HAIL             5 NE ANNANDALE          45.31N 94.05W 
                           
REPORTED AT SUGAR LAKE

0415 PM     TSTM WND DMG     3 SE PAYNESVILLE        45.35N 94.68W 
05/09/2004                   STEARNS            MN   AMATEUR RADIO   

10 INCH DIAMETER TREE SNAPPED IN HALF

0415 PM     HAIL             4 NE ANNANDALE          45.30N 94.06W 
05/09/2004  1.50 INCH        WRIGHT             MN   FIRE DEPT/RESCUE

0418 PM     HAIL             GROVE CITY              45.15N 94.68W 
05/09/2004  0.75 INCH        MEEKER             MN   LAW ENFORCEMENT 

0420 PM     HAIL             5 N LITCHFIELD          45.19N 94.53W 
05/09/2004  0.75 INCH        MEEKER             MN   TRAINED SPOTTER 

0421 PM     HAIL             LITCHFIELD              45.12N 94.53W 
05/09/2004  0.75 INCH        MEEKER             MN   LAW ENFORCEMENT 

0429 PM     TORNADO          3 S WATKINS             45.27N 94.41W 
05/09/2004                   MEEKER             MN   PUBLIC          

PUBLIC REPORT OF TORNADO CROSSING PASTURE ALONG ROUTE 17 
SOUTH OF WATKINS. PRELIMINARY TORNADO PENDING 
INVESTIGATION.

0430 PM     HAIL             WATKINS                 45.31N 94.41W 
05/09/2004  0.75 INCH        MEEKER             MN   LAW ENFORCEMENT 

0430 PM     TSTM WND DMG     WATKINS                 45.31N 94.41W 
05/09/2004                   MEEKER             MN   LAW ENFORCEMENT 

TREES WERE DOWNED.

0433 PM     TSTM WND DMG     5 SW LITCHFIELD         45.07N 94.60W 
05/09/2004                   MEEKER             MN   LAW ENFORCEMENT 

TWO TURKEY BARNS MINORLY DAMAGED ALONG ROUTE 23 NEAR LONG
LAKE. 

0443 PM     TSTM WND GST     HUTCHINSON              44.89N 94.37W 
05/09/2004  68 MPH           MCLEOD             MN   TRAINED SPOTTER 

LARGE TREE BRANCHES DOWNED. 

0444 PM     TORNADO          WAVERLY                 45.07N 93.97W 
05/09/2004                   WRIGHT             MN   LAW ENFORCEMENT 

POSSIBLE TORNADO AT INTERSECTION OF ROUTES 8 AND 107 
PENDING INVESTIGATION. REPORTED BY SHERIFF. 

0444 PM     TORNADO          1 SW MONTICELLO         45.29N 93.82W 
05/09/2004                   WRIGHT             MN   LAW ENFORCEMENT 

TORNADO REPORTED BY SHERIFF. INVESTIGATION PENDING. 

0450 PM     TSTM WND GST     ST MICHAEL              45.21N 93.66W 
05/09/2004  60 MPH           WRIGHT             MN   MESONET         

0455 PM     TSTM WND GST     HUTCHINSON              44.89N 94.37W 
05/09/2004  68 MPH           MCLEOD             MN   AWOS            

0458 PM     HAIL             COKATO                  45.08N 94.19W 
05/09/2004  0.75 INCH        WRIGHT             MN   TRAINED SPOTTER 

DURATION WAS 1643 TO 1658 CDT

0500 PM     HAIL             1 N HOWARD LAKE         45.07N 94.07W 
05/09/2004  0.75 INCH        WRIGHT             MN   TRAINED SPOTTER 

0505 PM     TSTM WND DMG     ELK RIVER               45.33N 93.57W 
05/09/2004                   SHERBURNE          MN   TRAINED SPOTTER 

A FEW TREES WERE DOWNED. 

0521 PM     TORNADO          GREENFIELD              45.10N 93.70W 
05/09/2004                   HENNEPIN           MN   LAW ENFORCEMENT 

HOUSE DAMAGED AND GARAGE DESTROYED. PRELIMINARY TORNADO 
PENDING INVESTIGATION. 

0527 PM     HAIL             5 S HUTCHINSON          44.82N 94.37W 
05/09/2004  1.00 INCH        MCLEOD             MN   TRAINED SPOTTER 

0527 PM     TSTM WND DMG     5 E NORWOOD/YOUNG AMERI 44.78N 93.92W 
05/09/2004                   CARVER             MN   FIRE DEPT/RESCUE

HEAVY DEBRIS REPORTED IN AIR NEAR COUNTY MAINTENANCE 
BUILDING BETWEEN NORWOOD AND COLGNE ALONG ROUTE 212. 

0530 PM     TSTM WND DMG     3 S ISANTI              45.45N 93.25W 
05/09/2004                   ISANTI             MN   LAW ENFORCEMENT 

POWER LINES DOWN

0535 PM     TSTM WND GST     NEW HOPE                45.04N 93.39W 
05/09/2004  60 MPH           HENNEPIN           MN   MESONET         

0535 PM     TSTM WND DMG     3 S CHANHASSEN          44.86N 93.56W 
05/09/2004                   CARVER             MN   PUBLIC          

TREES WERE DOWNED AT THE INTERSECTION OF ROUTES 212 AND 
101. THE TIME WAS ESTIMATED. 

0535 PM     HAIL             GLENCOE                 44.77N 94.15W 
05/09/2004  0.75 INCH        MCLEOD             MN   TRAINED SPOTTER 

0539 PM     TSTM WND DMG     PLYMOUTH                45.02N 93.46W 
05/09/2004                   HENNEPIN           MN   LAW ENFORCEMENT 

TREES WERE DOWNED AT INTERSECTION OF BASS LAKE ROAD AND 
ROUTE 169 IN PLYMOUTH. TREES WERE ALSO DOWNED BETWEEN 539
PM AND 555 PM IN ORONO... INDEPENDENCE... CRYSTAL... ST. 
ANTHONY AND ROGERS. 

0540 PM     HAIL             1 NE MINNEAPOLIS        44.97N 93.25W 
05/09/2004  0.75 INCH        HENNEPIN           MN   AMATEUR RADIO   

REPORTED IN ST. ANTHONY

0540 PM     TSTM WND GST     MINNEAPOLIS             44.96N 93.27W 
05/09/2004  66 MPH           HENNEPIN           MN   MESONET         

0540 PM     HAIL             BROOKLYN CENTER         45.07N 93.32W 
05/09/2004  0.75 INCH        HENNEPIN           MN   TRAINED SPOTTER 

0540 PM     HAIL             3 W GLENCOE             44.77N 94.21W 
05/09/2004  0.75 INCH        MCLEOD             MN   TRAINED SPOTTER 

REPORTED IN SUMTER. TIME WAS ESTIMATED. 

0542 PM     HAIL             MINNEAPOLIS             44.96N 93.27W 
05/09/2004  0.75 INCH        HENNEPIN           MN   NWS EMPLOYEE    

REPORTED AT LAKE NOKOMIS

0545 PM     TSTM WND DMG     ST PAUL                 44.95N 93.10W 
05/09/2004                   RAMSEY             MN   TRAINED SPOTTER 

TREES AND POWERLINES DOWN

0545 PM     HAIL             ST PAUL                 44.95N 93.10W 
05/09/2004  0.88 INCH        RAMSEY             MN   TRAINED SPOTTER 

0545 PM     HAIL             5 NNE DASSEL            45.15N 94.27W 
05/09/2004  0.75 INCH        MEEKER             MN   LAW ENFORCEMENT 

BRANCHES DOWN ALSO

0550 PM     HAIL             BLAINE                  45.17N 93.21W 
05/09/2004  0.88 INCH        ANOKA              MN   TRAINED SPOTTER 

0550 PM     TSTM WND DMG     ST PAUL                 44.95N 93.10W 
05/09/2004                   RAMSEY             MN   TRAINED SPOTTER 

SEVERAL TREES WERE DOWNED IN THE COMO PARK AREA

0550 PM     TSTM WND GST     FOREST LAKE             45.28N 92.99W 
05/09/2004  60 MPH           WASHINGTON         MN   MESONET         

TIME WAS ESTIMATED. 

0550 PM     HAIL             NEW BRIGHTON            45.07N 93.20W 
05/09/2004  0.75 INCH        RAMSEY             MN   AMATEUR RADIO   

0554 PM     TSTM WND GST     ST PAUL                 44.95N 93.10W 
05/09/2004  72 MPH           RAMSEY             MN   AWOS            

MEASURED AT HOLMAN FIELD.

0555 PM     TSTM WND DMG     FALCON HEIGHTS          44.99N 93.18W 
05/09/2004                   RAMSEY             MN   AMATEUR RADIO   

MULTIPLE BRANCHES DOWN

0559 PM     HAIL             WOODBURY                44.91N 92.92W 
05/09/2004  0.75 INCH        WASHINGTON         MN   TRAINED SPOTTER 

0602 PM     HAIL             1 NE MAPLEWOOD          45.00N 93.01W 
05/09/2004  0.75 INCH        RAMSEY             MN   AMATEUR RADIO   

REPORTED IN NORTH ST. PAUL AT INTERSECTION OF ROUTE 36 
AND 120. 

0603 PM     TSTM WND DMG     2 N SHAFER              45.42N 92.75W 
05/09/2004                   CHISAGO            MN   TRAINED SPOTTER 

6 INCH DIAMETER TREES DOWN

0607 PM     HAIL             4 NE NEW AUBURN         44.71N 94.17W 
05/09/2004  0.75 INCH        SIBLEY             MN   TRAINED SPOTTER 

0608 PM     HAIL             3 N GREEN ISLE          44.72N 94.01W 
05/09/2004  0.75 INCH        SIBLEY             MN   LAW ENFORCEMENT 

0615 PM     HAIL             DRESSER                 45.36N 92.63W 
05/09/2004  0.75 INCH        POLK               WI   FIRE DEPT/RESCUE

0615 PM     TSTM WND DMG     SHAKOPEE                44.77N 93.48W 
05/09/2004                   SCOTT              MN   TRAINED SPOTTER 

LARGE BRANCHES WERE DOWNED.

0615 PM     TSTM WND DMG     5 SE HUDSON             44.92N 92.67W 
05/09/2004                   ST. CROIX          WI   LAW ENFORCEMENT 

A FEW TREES WERE DOWNED. 

0615 PM     HAIL             NORTH ST PAUL           45.01N 93.00W 
05/09/2004  1.00 INCH        RAMSEY             MN   TRAINED SPOTTER 

0616 PM     TSTM WND GST     NEW RICHMOND            45.12N 92.54W 
05/09/2004  58 MPH           ST. CROIX          WI   AWOS            

0619 PM     HAIL             2 SW PRIOR LAKE         44.71N 93.46W 
05/09/2004  1.00 INCH        SCOTT              MN   TRAINED SPOTTER 

0620 PM     HAIL             COTTAGE GROVE           44.82N 92.93W 
05/09/2004  0.75 INCH        WASHINGTON         MN   TRAINED SPOTTER 

0630 PM     TSTM WND DMG     FALCON HEIGHTS          44.99N 93.18W 
05/09/2004                   RAMSEY             MN   LAW ENFORCEMENT 

PROCH WAS BLOWN OFF OF A HOUSE AT THE INTERSECTION OF 
LEXINGTON AND HORTON IN THE COMO AREA.

0650 PM     HAIL             APPLE VALLEY            44.75N 93.20W 
05/09/2004  0.75 INCH        DAKOTA             MN   AMATEUR RADIO   

0700 PM     HAIL             LAKEVILLE               44.68N 93.24W 
05/09/2004  0.75 INCH        DAKOTA             MN   TRAINED SPOTTER 

0700 PM     TSTM WND DMG     MENOMONIE               44.89N 91.91W 
05/09/2004                   DUNN               WI   LAW ENFORCEMENT 

TREES WERE DOWNED IN MENOMONIE AND OTTER CREEK TOWNSHIP. 
THE TIME WAS ESTIMATED. 

0700 PM     HAIL             5 E ELLSWORTH           44.74N 92.38W 
05/09/2004  1.00 INCH        PIERCE             WI   TRAINED SPOTTER 

0700 PM     HAIL             4 SE DALLAS             45.22N 91.76W 
05/09/2004  0.75 INCH        BARRON             WI   TRAINED SPOTTER 

0700 PM     HAIL             10 S ELLSWORTH          44.59N 92.48W 
05/09/2004  1.00 INCH        PIERCE             WI   TRAINED SPOTTER 

0707 PM     TORNADO          4 SE DALLAS             45.22N 91.76W 
05/09/2004                   BARRON             WI   PUBLIC          

POSSIBLE TORNADO PENDING INVESTIGATION IN SIOUX CREEK 
TOWNSHIP. 

0715 PM     HAIL             5 SW ELLSWORTH          44.69N 92.55W 
05/09/2004  1.00 INCH        PIERCE             WI   TRAINED SPOTTER 

0718 PM     TORNADO          2 SW NEW AUBURN         45.18N 91.59W 
05/09/2004                   CHIPPEWA           WI   LAW ENFORCEMENT 

POSSIBLE TORNADO PENDING INVESTIGATION 2 SW NEW AUBURN 
ALONG 235TH AVE. ALSO TREES DOWN JUST EAST OF NEW AUBURN.


0733 PM     TSTM WND GST     BELLE PLAINE            44.62N 93.76W 
05/09/2004  63 MPH           SCOTT              MN   TRAINED SPOTTER 

0740 PM     HAIL             2 S BELLE PLAINE        44.59N 93.76W 
05/09/2004  0.25 INCH        SCOTT              MN   PUBLIC          

0753 PM     HAIL             10 NW MANKATO           44.27N 94.13W 
05/09/2004  0.88 INCH        NICOLLET           MN   LAW ENFORCEMENT 

0755 PM     HAIL             DURAND                  44.63N 91.96W 
05/09/2004  0.75 INCH        PEPIN              WI   TRAINED SPOTTER 

0758 PM     TSTM WND DMG     10 S BRUCE              45.31N 91.27W 
05/09/2004                   RUSK               WI   LAW ENFORCEMENT 

LARGE TREE DOWN BLOCKING ROAD

0800 PM     HAIL             BELLE PLAINE            44.62N 93.76W 
05/09/2004  1.00 INCH        SCOTT              MN   TRAINED SPOTTER 

0805 PM     HAIL             DURAND                  44.63N 91.96W 
05/09/2004  0.88 INCH        PEPIN              WI   LAW ENFORCEMENT 

0807 PM     HAIL             PEPIN                   44.44N 92.15W 
05/09/2004  0.75 INCH        PEPIN              WI   PUBLIC          

0812 PM     HAIL             AUGUSTA                 44.68N 91.12W 
05/09/2004  0.75 INCH        EAU CLAIRE         WI   LAW ENFORCEMENT 

0819 PM     HAIL             5 E SLEEPY EYE          44.30N 94.62W 
05/09/2004  0.88 INCH        BROWN              MN   TRAINED SPOTTER 

0833 PM     HAIL             5 N KILKENNY            44.39N 93.57W 
05/09/2004  1.00 INCH        LE SUEUR           MN   TRAINED SPOTTER 

0835 PM     HAIL             MONTGOMERY              44.44N 93.58W 
05/09/2004  0.75 INCH        LE SUEUR           MN   TRAINED SPOTTER 

0841 PM     HAIL             5 S MONTGOMERY          44.37N 93.58W 
05/09/2004  0.75 INCH        LE SUEUR           MN   TRAINED SPOTTER 

0900 PM     HAIL             DUNDAS                  44.43N 93.20W 
05/09/2004  0.75 INCH        RICE               MN   TRAINED SPOTTER 

0903 PM     HAIL             MANKATO                 44.17N 93.99W 
05/09/2004  1.00 INCH        BLUE EARTH         MN   LAW ENFORCEMENT 

0903 PM     HAIL             10 N MANKATO            44.17N 93.99W 
05/09/2004  0.88 INCH        BLUE EARTH         MN   LAW ENFORCEMENT 

0905 PM     HAIL             7 NW FARIBAULT          44.30N 93.27W 
05/09/2004  0.75 INCH        RICE               MN   LAW ENFORCEMENT 

0920 PM     HAIL             5 E MANKATO             44.17N 93.89W 
05/09/2004  1.00 INCH        BLUE EARTH         MN   TRAINED SPOTTER 

0923 PM     HAIL             4 E FARIBAULT           44.30N 93.19W 
05/09/2004  0.75 INCH        RICE               MN   PUBLIC          

0924 PM     HAIL             2 E EAGLE LAKE          44.16N 93.84W 
05/09/2004  0.75 INCH        BLUE EARTH         MN   LAW ENFORCEMENT 

0935 PM     HAIL             MORRISTOWN              44.22N 93.44W 
05/09/2004  1.00 INCH        RICE               MN   LAW ENFORCEMENT 

0945 PM     HAIL             4 N ZUMBROTA            44.35N 92.67W 
05/09/2004  0.75 INCH        GOODHUE            MN   LAW ENFORCEMENT 

1111 PM     HAIL             ALBERT LEA              43.66N 93.37W 
05/09/2004  0.75 INCH        FREEBORN           MN   LAW ENFORCEMENT 

-

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URL: http://climate.umn.edu/doc/journal/snowburst040308.htm
Last modified: March 5, 2004