Thunderstorms began to develop along a weak frontal boundary across southern Minnesota, between Springfield and Mankato. These storms moved to the east across portions of south central and east central Minnesota and spanned numerous reports of large hail, very heavy rainfall, and gusty winds.
Every event with a place to put it. 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 MPX wrote it up.
Thunderstorms began to develop along a weak frontal boundary across southern Minnesota, between Springfield and Mankato. These storms moved to the east across portions of south central and east central Minnesota and spanned numerous reports of large hail, very heavy rainfall, and gusty winds. Most of the hail stones were one inch in diameter, however, a few reports of up to tennis ball size was reported near Mankato. These storms moved into west central Wisconsin and caused more hail near Lake Pepin. Another complex of storms moved across northeast South Dakota, and into west central Minnesota during the late evening. These storms caused more large hail reports during the early morning in east central Minnesota.
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 Twin Cities, MN wrote its last area forecast discussion before the first event at May 2, 3:06 PM CST, 1 hour 28 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 406 PM CDT WED MAY 2 2012 .DISCUSSION... SYNOPSIS...UPPER PATTERN THIS AFTERNOON CONTINUES TO SHOW WSW FLOW IN PLACE ACROSS THE NRN PLAINS INTO THE UPPER GREAT LAKES...AS STRONG SUB-TROPICAL RIDGING REMAINS ANCHORED OVER THE SOUTHEAST US. THERE IS CURRENTLY A NICE UPPER JET STREAK WORKING ACROSS SODAK INTO NRN MN...WITH SHORTWAVE ENERGY CURRENTLY IN WY EXPECTED TO FOLLOW THE JET INTO NW MN THIS EVENING. THIS UPPER AIR PATTERN LOOKS TO REMAIN MORE OR LESS IN PLACE THROUGH THE REST OF THIS WORK WEEK. THIS WEEKEND...A STRONGER TROUGH WILL WORK ACROSS THE ROCKIES INTO THE NRN PLAINS AS UPPER RIDGING BUILDS UP INTO THE GREAT LAKES. THIS UPPER TROUGH IS CURRENTLY FORECAST BY THE MED RANGE MODELS TO CUT OFF OVER SRN CAN AND LINGER ACROSS THE AREA INTO THE MIDDLE OF NEXT WEEK. AT THE SFC...THE FLOW PATTERN THIS AFTERNOON IS RATHER DIFFUSE ACROSS THE AREA. COOL FRONT THAT WORKED INTO WRN MN OVERNIGHT HAS STALLED OUT ACROSS THE AREA FROM REDWOOD FALLS UP THROUGH RUSH CITY. PRESSURE GRADIENT IS QUITE BAGGY...SO THERE REALLY IS NO CONVERGENCE ALONG THE BOUNDARY...ONLY A STRONG MOISTURE GRADIENT...WITH DEWPS DOWN AROUND 40 IN THE AXN AREA...WITH AN INCREASE INTO THE LOWER 60S ACROSS SRN/SE MN. THROUGH THE REST OF THIS WORK WEEK...THE MOISTURE GRADIENT LOOKS TO JUST WAFFLE AROUND THE CWA. THERE WILL BE TWO DOMINATE AND RATHER PERSISTENT SFC FEATURES THROUGH FRIDAY...HIGH PRESSURE OVER HUDSON BAY AND LEE SIDE TROUGHING/LOW PRESSURE OVER THE CENTRAL PLAINS. THIS WILL EVENTUALLY ACT TO REORIENT THE MOISTURE GRADIENT FROM ITS CURRENT SW-NE ORIENTATION OVER TO A NW TO SE ORIENTATION BY FRIDAY. OVER THE WEEKEND...STRONGER FRONTS/INVERTED TROUGHS LOOK TO MOVE ACROSS THE REGION FRI NIGHT AND AGAIN SAT NIGHT. BEHIND THE SAT NIGHT FRONT...THERE ARE INDICATIONS FOR HIGH PRESSURE TO WORK IN ON MORE NW FLOW ALOFT...WITH THE FIRST HALF OF NEXT WEEK LOOKING COOLER AND DRIER/LESS ACTIVE. FOR PRECIP CHANCES...CONFIDENCE IS PROBABLY THE HIGHEST AT THIS POINT FOR THE FEATURE COMING THROUGH SATURDAY NIGHT. TILL THEN...WE KEEP THE MOISTURE GRADIENT...AND THEREFORE INSTABILITY GRADIENT IN THE AREA...WHICH MAKES IT HARD TO RULE OUT THUNDERSTORMS AT ANY POINT REALLY THROUGH SAT NIGHT. FOR THIS AFTERNOON...MESOANALYIS HAS SHOWN MLCAPES INCREASE TO 1500-2500 J/KG FROM SRN MN BACK INTO WRN IA/ERN NEB WITH LITTLE/NO CIN INDICATED. FORTUNATELY...THE DIFFUSE AND EVEN DIFFLUENT NATURE OF THE SFC WIND FIELD ACROSS IA HAS KEPT STORMS FROM DEVELOPING...BUT CU FIELD OVER ERN NEB LOOKING A BIT MORE PERTURBED IN REGION OF STRONGER SFC CONVERGENCE ALONG THE INVERTED TROUGH. CURRENT THINKING IS THAT STORMS WILL DEVELOP OVER ERN NEB IN THE NEXT TWO HOURS AND QUICKLY CONGEAL INTO AN MCS THAT THEN TRACKS ACROSS THE NOSE OF WHAT WILL BE A STRENGTHENING LLJ. HOW FAR NORTH THIS LLJ GOES WILL DETERMINE OUR CONVECTIVE POTENTIAL TONIGHT...BUT LOOKING AT THE CURRENT RUC...IT WOULD FAVOR A MAJORITY OF THE ACTIVITY STAYING SOUTH ACROSS IA. FURTHER NORTH...A NICE FIELD OF ACCUS IS PRESENT ON SATELLITE ACROSS NODAK AT THE MOMENT. THE RUC ALONG WITH MOST OTHER MODELS SHOW THE WY WAVE WORKING ACROSS THE DAKOTAS INTO NRN MN TONIGHT...WAA ASSOCIATED WITH THIS FEATURE WILL LIKELY TAKE AN AREA OF SHOWERS/STORMS ACROSS CENTRAL/NRN MN. AS A RESULT...EXPECT NRN AND SRN/SE SECTIONS OF THE CWA TO HAVE THE BEST POTENTIAL FOR SHRA/TSRA TONIGHT...WITH IT BEING VERY POSSIBLE THAT LITTLE HAPPENS IN BETWEEN. FOR THURSDAY AND FRIDAY...THE HUDSON HIGH LOOKS TO SLOWLY GAIN STRENGTH THROUGH THE PERIOD...WITH THE HOPE THAT IT POSSIBLY GIVES A DRY THURSDAY NIGHT THROUGH FRIDAY MORNING. FOR THURSDAY...THE BIG QUESTION IS WHAT HAPPENS AT THE SFC. SREF/NAM/GFS SHOW AN INVERTED TROUGH/WEAK SFC LOW MOVING INTO SW MN BY THE AFTERNOON...WITH MLCAPE VALUES AGAIN INCREASING TO BETWEEN 1000 AND 2000 J/KG. IF THIS OCCURS...THUNDER CHANCES WOULD BE HIGHEST ACROSS WRN MN...SO HAD TO DRAG CHANCE POPS BACK ACROSS THE ENTIRE CWA FOR THEN. IF THIS SCENARIO DOES PLAY OUT...THEN THE SLIGHT RISK IN THE DAY 2 OUTLOOK FOR SW MN IS WARRANTED...OTHERWISE WE WOULD JUST SEE SOME WIDELY SCATTERED THUNDERSTORMS ALONG THE BOUNDARY. FOR FRIDAY...IT IS LOOKING THE HUDSON HIGH WILL HELP CUT OFF PRECIP DURING THE MORNING...BUT INCREASING WAA DURING THE AFTERNOON IN RESPONSE TO A SHORTWAVE MOVING ACROSS THE DAKOTAS WILL LEAD TO AN INCREASING THREAT FOR SHOWERS...ESPECIALLY FOR THE NW MPX CWA. THIS WEEKEND...THE MODELS POINT TO A COUPLE OF POTENTIAL SFC WAVES TO WORK THROUGH. FOR SAT NIGHT...THE ECWMF IS BY FAR THE MOST AGGRESSIVE WITH PRECIP ASSOCIATED WITH THIS FEATURE...WHILE MORE AGREEMENT BETWEEN THE MODELS EXISTS WITH THE FEATURE FOR SAT NIGHT INTO SUNDAY...WITH HIGH CHANCE/LIKELY POPS FOR THEN. AT THIS POINT...THE SEVERE THREAT WITH ANY OF THIS ACTIVITY LOOKS TO BE LOW...AS BEST MOISTURE/INSTABILITY LOOKS TO REMAIN SOUTH OF THE AREA CLOSER TO THE SFC LOW THAT IS FORECAST TO WORK ACROSS MO. GOING INTO NEXT WEEK...WE ARE LIKELY HOLDING ON TO POPS INTO MONDAY A BIT TOO LONG WHEN LOOKING AT THE 02.12 ECWMF/GFS AS SFC RIDGING LOOKS TO POSSIBLY GIVE US A FEW DAYS OF COOLER AND DRIER WEATHER FOR THE FIRST HALF OF NEXT WORK WEEK. && .AVIATION.../18Z TAF ISSUANCE/ STRATUS RAPIDLY DISSIPATED LT THIS MRNG...BUT CU IS BEGINNING TO DEVELOP FROM PLENTIFUL LOW LEVEL MOISTURE. MAIN DEVELOPMENT HAS BEEN AHEAD OF WEAK WIND SHIFT WHICH HAS BEEN PROGRESSING THRU AREA. THIS FEATURE LIES FROM S OF CBG TO JUST N OF HCD THEN INTO SW MN. WINDS SPEEDS ARE VERY LIGHT SO IT HAS BEEN DIFFICULT TO PROG TIMING OF WIND SHIFT. STILL FEEL THAT BEST POTENTIAL FOR AFTN TSTMS WILL BE ACROSS S MN. SPC MLCAPE HAS INCREASED TO AROUND 1500 J/KG NEAR THE IA BORDER...WITH FURTHER INCREASES AS ATMOS CONTINUES TO WARM. MINIMUAL CIN ACROSS THAT AREA AS WELL. ACTIVITY SHUD THEN GRADUALLY BUILD NORTH LT AFTN AND EVENING. SEE TAFS ON TIMING OF WINDS AND TSTMS. KMSP...SCT030 CU DEVELOPING ACROSS AREA MAY GO BKN ARND 040 DURING THE AFTN. WIND SPEEDS WILL CONTINUE VERY LIGHT THIS AFTN. WEAK SW WINDS SHUD BECOME LIGHT NW FOR A TIME MID AFTN AS WEAK SURFACE DROP THRU AND THEN END UP SE EARLY EVENING. SPEEDS GNRLY 5 KTS OF LESS. TSTMS EXPECTED TO DEVELOP ARND 21-22Z IN S MN AND EXPAND N DURING LT AFTN EVE...AFFECTING MSP AFT 01Z. WITH PCPN AND LIGHT WINDS EXPECT MVFR CIGS TO DEVELOP OVERNITE INTO THURS MRNG. OTLK... THURSDAY MVFR CIGS ERLY...CHC OF SHRA/TSRA IN AFTERNOON. FRIDAY...MVFR POSSIBLE BEHIND COLD FRONT FOR A TIME. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...NONE. WI...NONE. && MPG/BAP
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 513 PM CDT WED MAY 2 2012 MNZ064>070-073>078-082>085-091>093-WIZ024-026-028-032215- YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA- REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH- WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-PIERCE-PEPIN-EAU CLAIRE- 513 PM CDT WED MAY 2 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MINNESOTA...EAST CENTRAL MINNESOTA...SOUTH CENTRAL MINNESOTA... SOUTHEAST MINNESOTA...SOUTHWEST MINNESOTA...WEST CENTRAL MINNESOTA AND WEST CENTRAL WISCONSIN. .DAY ONE...TONIGHT THE THREAT OF THUNDERSTORMS WILL INCREASE OVER SOUTHERN MINNESOTA AND PART OF WEST CENTRAL WISCONSIN DURING THE EVENING. SEVERE THUNDERSTORMS ARE POSSIBLE...WITH THE MAIN THREAT BEING LARGE HAIL AND DAMAGING WINDS. AN ISOLATED TORNADO IS ALSO POSSIBLE NEAR THE IOWA BORDER. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS MAY STILL BE ONGOING OVER THE AREA THURSDAY MORNING SOME OF WHICH COULD STILL STRONG. ADDITIONAL THUNDERSTORMS ARE POSSIBLE THROUGH THE WEEKEND. THE THREAT OF SEVERE WEATHER APPEARS LOW AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION MAY BE NEEDED TONIGHT AND AGAIN LATER THURSDAY. MNZ041>045-047>063-WIZ014>016-023-025-027-032215- DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS- BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA- KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-POLK- BARRON-RUSK-ST. CROIX-DUNN- 513 PM CDT WED MAY 2 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MINNESOTA...EAST CENTRAL MINNESOTA...WEST CENTRAL MINNESOTA... NORTHWEST WISCONSIN AND WEST CENTRAL WISCONSIN. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS ACROSS CENTRAL MINNESOTA INTO WEST CENTRAL WISCONSIN OVERNIGHT. SOME OF THESE STORMS COULD BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREAT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS MAY STILL BE ONGOING OVER THE AREA THURSDAY MORNING SOME OF WHICH COULD STILL STRONG. ADDITIONAL THUNDERSTORMS ARE POSSIBLE THROUGH THE WEEKEND. THE THREAT OF SEVERE WEATHER APPEARS LOW AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION MAY BE NEEDED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1144 AM CDT WED MAY 02 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0625 PM HAIL ST CLOUD 45.55N 94.17W
05/01/2012 E0.75 INCH STEARNS MN TRAINED SPOTTER
SCSU
&&
CARLYONPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1238 PM CDT WED MAY 02 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0411 PM HAIL 1 S GLENWOOD 45.64N 95.38W
05/01/2012 M1.00 INCH POPE MN TRAINED SPOTTER
0440 PM HAIL 10 E GLENWOOD 45.65N 95.18W
05/01/2012 M0.88 INCH POPE MN FIRE DEPT/RESCUE
REPORTED NEAR GROVE LAKE.
0445 PM TORNADO 3 W BROOTEN 45.50N 95.18W
05/01/2012 POPE MN TRAINED SPOTTER
0448 PM TORNADO SEDAN 45.58N 95.25W
05/01/2012 POPE MN TRAINED SPOTTER
BRIEF TOUCHDOWN NEAR SEDAN
0453 PM HAIL 4 S SAUK CENTRE 45.68N 94.96W
05/01/2012 M1.00 INCH STEARNS MN TRAINED SPOTTER
0500 PM HAIL 5 SE DAWSON 44.88N 95.98W
05/01/2012 M0.50 INCH LAC QUI PARLE MN TRAINED SPOTTER
0501 PM HAIL 6 E DAWSON 44.93N 95.93W
05/01/2012 M1.00 INCH LAC QUI PARLE MN TRAINED SPOTTER
0507 PM TORNADO 3 NE BROOTEN 45.53N 95.08W
05/01/2012 STEARNS MN AMATEUR RADIO
0519 PM HAIL MELROSE 45.68N 94.81W
05/01/2012 M0.88 INCH STEARNS MN TRAINED SPOTTER
0530 PM HAIL 1 W FREEPORT 45.66N 94.71W
05/01/2012 M1.00 INCH STEARNS MN TRAINED SPOTTER
0530 PM HAIL FREEPORT 45.66N 94.69W
05/01/2012 M1.75 INCH STEARNS MN TRAINED SPOTTER
0530 PM HAIL 10 N MONTEVIDEO 45.10N 95.69W
05/01/2012 M1.00 INCH CHIPPEWA MN LAW ENFORCEMENT
0535 PM FUNNEL CLOUD 5 W BECKER 45.37N 93.98W
05/01/2012 WRIGHT MN AMATEUR RADIO
0546 PM HAIL ALBANY 45.63N 94.57W
05/01/2012 M1.75 INCH STEARNS MN TRAINED SPOTTER
0548 PM HAIL ALBANY 45.63N 94.57W
05/01/2012 M1.75 INCH STEARNS MN TRAINED SPOTTER
COVERING GROUND WINDSHIELDS BROKEN ENTIRE CITY
0607 PM HAIL ST STEPHEN 45.70N 94.28W
05/01/2012 M1.75 INCH STEARNS MN TRAINED SPOTTER
0610 PM HAIL ST JOSEPH 45.57N 94.32W
05/01/2012 M1.75 INCH STEARNS MN TRAINED SPOTTER
0614 PM HAIL SARTELL 45.62N 94.21W
05/01/2012 M1.75 INCH STEARNS MN TRAINED SPOTTER
0615 PM HAIL SARTELL 45.62N 94.21W
05/01/2012 M0.88 INCH STEARNS MN TRAINED SPOTTER
0617 PM HAIL 1 N SARTELL 45.63N 94.21W
05/01/2012 E1.00 INCH STEARNS MN TRAINED SPOTTER
0625 PM HAIL ST CLOUD 45.55N 94.17W
05/01/2012 E0.75 INCH STEARNS MN TRAINED SPOTTER
SCSU
0629 PM HAIL 3 NW ST CLOUD 45.59N 94.21W
05/01/2012 M1.00 INCH STEARNS MN TRAINED SPOTTER
0630 PM FUNNEL CLOUD 6 E SAUK RAPIDS 45.59N 94.05W
05/01/2012 BENTON MN TRAINED SPOTTER
0634 PM TSTM WND GST 4 E SAUK RAPIDS 45.61N 94.07W
05/01/2012 M64.00 MPH BENTON MN MESONET
0638 PM HAIL 2 E ST CLOUD 45.55N 94.13W
05/01/2012 M1.00 INCH SHERBURNE MN TRAINED SPOTTER
0645 PM HAIL DUELM 45.56N 93.94W
05/01/2012 M1.75 INCH BENTON MN TRAINED SPOTTER
0700 PM HEAVY RAIN SAUK RAPIDS 45.59N 94.17W
05/01/2012 M2.50 INCH BENTON MN TRAINED SPOTTER
0710 PM HAIL 2 N WALNUT GROVE 44.25N 95.47W
05/01/2012 M1.00 INCH REDWOOD MN LAW ENFORCEMENT
0720 PM TSTM WND DMG 3 W PRINCETON 45.57N 93.65W
05/01/2012 MILLE LACS MN LAW ENFORCEMENT
TREE DOWN ON HIGHWAY 95
0720 PM TSTM WND DMG PRINCETON 45.57N 93.59W
05/01/2012 MILLE LACS MN FIRE DEPT/RESCUE
STREET LITES TOPPLED AND LARGE TREES TOOK DOWN POWER
POLES ON EAST SIDE OF CITY
0727 PM TSTM WND GST CLEARWATER 45.41N 94.04W
05/01/2012 M54.00 MPH WRIGHT MN MESONET
0740 PM TSTM WND DMG WINSTED 44.97N 94.05W
05/01/2012 MCLEOD MN LAW ENFORCEMENT
LARGE BRANCH DOWN ON POWER LINE
0745 PM TSTM WND DMG 3 N BUFFALO 45.21N 93.86W
05/01/2012 WRIGHT MN LAW ENFORCEMENT
TREE BLOCKING ROAD
0830 PM HAIL W LAMBERTON 44.23N 95.27W
05/01/2012 E0.88 INCH REDWOOD MN TRAINED SPOTTER
40 MPH ALSO WITH THIS STORM...TIME ESTIMATED FROM RADAR
0835 PM HAIL 4 W GREEN ISLE 44.68N 94.09W
05/01/2012 M0.88 INCH SIBLEY MN TRAINED SPOTTER
1159 PM HEAVY RAIN ST CLOUD 45.55N 94.17W
05/01/2012 M3.11 INCH STEARNS MN TRAINED SPOTTER
SCSU
&&
CARLYONThe Minneapolis radar (KMPX), 110 km away, was scanning. The volume nearest the first event began at 22:33 UTC.
34 hail, 3 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Several spotters and the emergency manager reported a swath of hail stones from near the Watonwan, Brown county line, northeast to the Brown, Blue Earth county line. The largest hail stones were 1.25 inches in diameter.
Numerous spotters and local law enforcement officials reported a swath of large hail, up to golf ball size, from 6 miles west of North Mankato, to just west of North Mankato.
Several spotters and local law enforcement officials reports a swath of very large hail from just west of North Mankato, to approximately 2 miles north of North Mankato. Most of the hail was quarter to half dollar size, but a few reports of tennis ball size hail was noted.
Consistent hail of half dollar size was covering the ground from Waterville, and east to Calvary Cemetery.
In addition to quarter size hail, winds were measured at 51 mph in Morristown.
Quarter size hail lasted for approximately five minutes south of Cannon Lake.
Golf ball size hail fell in Warsaw, Minnesota, it covered the ground in areas, and damaged numerous cars.
Quarter size hail was observed for a few minutes north of Hanska, Minnesota.
Local officials also reported hail damage to playground equipment, roofs and windows.
Heavy rainfall occurred during the early evening of May 2nd. Flooding was observed in the town of Warsaw, with flood waters up to 5 feet in residential areas, stalled cars, and several roads impassable.
Heavy rainfall fell during the evening of May 2nd. Flooding was observed in the town of Faribault, especially in the southeast part of town where flood waters rose up to 5 feet in some residential areas. A local campground had flood waters close both their entrance and exit roads during the height of the storm.
Heavy rainfall across Goodhue County caused flooding on Highway 57, along the North Fork of the Zumbro River, north of Wanamingo, Minnesota. In addition, over two inches of rainfall was measured near Wanamingo.
Several large tree branches and one large tree blew down in the southern part of Litchfield. In addition, a plane was flipped over at the Litchfield airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2012Every state in 2012This day in weather historyWarnings in Minnesota, May 2012
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: 368745, 368747, 368748, 368756, 368752, 368755, 370175, 368757, 368758, 368761, 368762, 368767, 368765, 368763, 368772, 368766, 368764, 368774, 370112, 368768, 370104, 370113, 368770, 368773, 370171, 368775, 370268, 368776, 368777, 368779, 368780, 368781, 368782, 368783, 368784, 368785, 370173, 368787.