Strong winds from a wake low blew down trees and power lines.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DLH wrote it up.
Strong winds from a wake low blew down trees and power lines.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Duluth, MN wrote its last area forecast discussion before the first event at May 22, 5:09 AM CST, 4 hours 31 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DULUTH MN 609 AM CDT SAT MAY 22 2010 .AVIATION...UPDATE FOR 12Z TAFS PATCHY EARLY MRNG FG WILL BURN OFF QUICKLY...THEN VFR CONDS THRU THE REST OF THE DAY. HAVE PHASED IN MVFR CONDS IN TSRA OVNGT AS CFNT EDGES CLOSER...WRN-MOST TAF SITES FIRST...THEN SPREADING E. SEE BLO FOR SYNOPTIC DETAILS. && .PREV DISCUSSION... /ISSUED 351 AM CDT SAT MAY 22 2010/ DISCUSSION...LATEST REGIONAL SFC ANALYSIS CONTINUES TO SHOW A RIDGE OF HIGH PRESSURE OVER OUR FCST AREA AND LAKE SUPERIOR...RESULTING IN DRY AND COOL CONDITIONS EARLY THIS MORNING UNDER PARTLY TO MOSTLY CLEAR SKIES. PATCHY FOG HAS ALSO FORMED ACROSS PORTIONS OF OUR CWA WHERE SKIES HAVE CLEARED OUT. THE MAIN FORECAST FOCUS FOR THE SHORT TERM WILL BE AN UPPER LEVEL TROUGH OVER THE NRN HIGH PLAINS...AND A SFC COLD FRONT THAT IS PROGGED TO TRACK EWD ACROSS THE DAKOTAS TONIGHT AND OVER THE UPPER MIDWEST ON SUNDAY. LIFT ASSOCIATED WITH THE FRONT AND SOME UPPER LEVEL FORCING FROM A LEAD SHORTWAVE WILL TAP INCREASING INSTABILITY AND MOISTURE ACROSS THE NORTHLAND...BRINGING A CHANCE OF SHOWERS AND THUNDERSTORMS TO OUR MN ZONES THIS AFTERNOON AND TONIGHT. THE SHOWERS AND STORMS WILL SPREAD EWD ACROSS THE REST OF OUR CWA ON SUNDAY INCLUDING NWRN WI. NAM12 HAS MUCAPE VALUES GENERALLY RANGE FROM 1000 TO 3000 J/KG THIS AFTERNOON THROUGH SUNDAY...WITH HIGHER VALUES NEAR 4000 J/KG ACROSS NWRN ON SUNDAY. THE COMBINATION OF MODERATE TO HIGH INSTABILITY COMBINED WITH SUFFICIENT 0-3KM SRH VALUES OF 100 TO 200 M2/S2 WILL RESULT IN A SLIGHT RISK OF SEVERE THUNDERSTORMS...LATE TONIGHT ACROSS OUR WRN ZONES...THEN FARTHER EAST INCLUDING NWRN WI ON SUNDAY PER SWODY1 AND SWODY2. TEMPERATURES WILL RANGE 5 TO 10 DEGREES ABOVE NORMAL WITH HIGHS IN THE 70S AND LOWER 80S TODAY...AND EVEN WARMER ON SUNDAY. HOWEVER DUE TO THE EASTERLY WINDS...TEMPS WILL BE COOLER ALONG THE LAKE SUPERIOR SHORELINE. EXTENDED...SUNDAY NIGHT THROUGH FRIDAY. MAIN WEA FEATURE CONTS TO BE L/WV TROF OVR WRN U.S. AND STRONG S/WVS THAT MOVE UP THE ERN SIDE. ONE S/WV DEPARTS THE REGION SUN NITE...FOLLOWED BY THE SECOND MON NITE THRU TUE NITE. IN THE LWR LVLS...SEVERAL FNTL BOUNDARIES MAKE THEIR APPEARANCE ALG WITH A PERSISTENT MOIST SLY FLOW. WITH WARMER TEMPS AND MORE MSTR THAN WE HAVE HAD...DIURNAL HTG...AND SUFFICIENT LOW AND UPR LVL FORCING...SOME SORT OF POPS WERE REQUIRED FOR EVERY PERIOD. FOR THE WED THRU FRI PD WE MAY EVENTUALLY BE ABLE TO REMOVE THE PRECIP ACRS THE N AS ALL MODELS ARE SHOWING A DRIER FLOW AND MORE SUBSIDENCE AS A CN HIGH TRIES TO PUSH S OF THE BORDER. BUT THERE IS STILL TOO MUCH DISAGREEMENT ON THE DETAILS...SO OPTED TO LEAVE IN LOW POPS. WILL RE-EVALUATE ON LATER SHIFTS. AVIATION.../06Z TAF ISSUANCE/ SOME LOW STRATUS AND BR WILL AFFECT KHYR OVERNIGHT...AS A TROUGH OF LOW PRESSURE PASSES THROUGH SRN WISCONSIN. OTW...VFR SKIES EXPECTED ACROSS THE NORTHLAND...THOUGH WINDS WILL BECOME GUSTY ON SAT AS GRADIENT INC WITH ANOTHER TROUGH OF LOW PRESSURE APPROACHING THE PLAINS. && .POINT TEMPS/POPS... DLH 70 58 77 56 / 10 30 50 20 INL 79 60 81 54 / 30 50 50 20 BRD 80 63 83 57 / 10 50 40 20 HYR 80 62 88 61 / 10 10 30 20 ASX 75 60 84 60 / 10 10 30 20 && .DLH WATCHES/WARNINGS/ADVISORIES... MN...NONE. WI...NONE. LS...NONE. && SHORT TERM...BERDES EXTENDED....04 AVIATION...04
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DULUTH MN 512 AM CDT SAT MAY 22 2010 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-231030- KOOCHICHING-NORTHERN ST. LOUIS-NORTHERN COOK/NORTHERN LAKE- NORTHERN ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/LAKESHORE- SOUTHERN COOK/LAKESHORE-NORTHERN CASS-SOUTHERN ITASCA- SOUTHERN CASS-CROW WING-NORTHERN AITKIN-SOUTHERN AITKIN- CARLTON/SOUTHERN ST. LOUIS-PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON- BURNETT-WASHBURN-SAWYER-PRICE- 512 AM CDT SAT MAY 22 2010 ...SLIGHT RISK OF SEVERE THUNDERSTORMS LATE TONIGHT THROUGH SUNDAY NIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON THROUGH TONIGHT MAINLY ACROSS NORTHEAST MINNESOTA. THERE IS A SLIGHT RISK THAT SOME THUNDERSTORMS MAY BE SEVERE LATE TONIGHT WEST OF A LINE FROM INTERNATIONAL FALLS MN TO BRAINERD MN. LARGE HAIL AND DAMAGING WINDS WILL THE MAIN HAZARDS FROM SEVERE THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THERE IS A CHANCE OF THUNDERSTORMS SUNDAY THROUGH FRIDAY ACROSS MOST OF THE NORTHLAND. THERE IS A SLIGHT RISK THAT SOME THUNDERSTORMS MAY BE SEVERE ACROSS NORTHWESTERN WISCONSIN SUNDAY AND SUNDAY NIGHT. LARGE HAIL AND DAMAGING WINDS WILL THE MAIN HAZARDS FROM SEVERE THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION MAY BE NEEDED TONIGHT. LSZ121-140>148-231030- BAYFIELD TO OAK POINT WI-GRAND PORTAGE TO GRAND MARAIS MN- GRAND MARAIS TO TACONITE HARBOR MN- TACONITE HARBOR TO SILVER BAY HARBOR MN- SILVER BAY HARBOR TO TWO HARBORS MN-TWO HARBORS TO DULUTH MN- DULUTH MN TO PORT WING WI-PORT WING TO SAND ISLAND WI- SAND ISLAND TO BAYFIELD WI-OAK POINT TO SAXON HARBOR WI- 512 AM CDT SAT MAY 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS LATE TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THERE IS A CHANCE OF THUNDERSTORMS SUNDAY THROUGH FRIDAY. BERDES MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS: HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)
The national radar mosaic for the moment the first event began.
7 strong wind. Local standard time, as filed.
A large pine tree fell down over a power line, causing power outages in Walker.
Small limbs were blown down in Pillager.
Small limbs were blown down in Hackensack. MNDOT Chamberlain MN-64 mile post 42 Measured a wind gust to 56 mph.
Local law enforcement reported several trees and power lines down, with a tree felled on a car at Brainerd International Raceway.
Many 4-inch diameter branches were blown down, with some trees and power lines blown down in Cohasset.
Power lines and trees were blown down in Hill City.
Small limbs were blown down, with small objects blown about by the wind in Keewatin.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2010Every state in 2010This day in weather historyWarnings in Minnesota, May 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 236941, 236942, 236944, 236945, 236947, 236948, 236949.