Warm frontal boundary induced severe weather.
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.
Warm frontal boundary induced severe weather.
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 Aug 13, 7:05 PM CST, 1 hour 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 805 PM CDT MON AUG 13 2007 ISSUED 241 PM CDT MON AUG 13 2007 .DISCUSSION... STILL TRICKY FORECAST TO INITIATION THIS EVENING. BEST PRESSURE FALLS NOW OVER EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA BUT AN EXTENSION INTO SOUTHWEST MINNESOTA. VERY WARM MID LEVEL TEMPS +12-14 C ADVECTING INTO SOUTHERN MN. WE STILL LIKE THE IDEA OF THE BEST LI GRADIENT SETTING UP OVER WEST CENTRAL INTO EAST CENTRAL MN AND POTENTIAL FOR DEVELOPMENT ON THE NORTH EDGE OF THE WARM MID LEVEL TEMPS AND THEN CRASHING/DEVELOPING TO THE SOUTHEAST. CAN NOT RULE OUT THE WEAK SB CIN DEVELOPING OVER SOUTH CENTRAL MN AS POSSIBLE DEVELOPMENT AREA...BUT DEEPER LAYER MOISTURE CONV SEEN ON LAST COUPLE HOURS OF LAPS...CONCENTRATING OVER WEST CENTRAL MN. NOT MUCH IN THE WAY OF UPPER FORCING AS YET IN SOUTH CENTRAL MN. WE HAVE HIGHLIGHTED AREAS OF CENTRAL MINNESOTA FOR A TORNADO RISK. WE LOOK TO REMAIN IN A FAIRLY ACTIVE PATTERN THROUGH MUCH OF THE NEXT 7 DAYS...WITH PERIODIC PRECIPITATION CHANCES. COLD FRONT WILL PASS THROUGH THE AREA DURING THE MID TO LATE PART OF TOMORROW...BUT WILL REMAIN CLOSE ENOUGH TO THE SOUTHERN PART OF THE AREA TO GENERATE SOME THUNDERSTORMS TOMORROW NIGHT AND INTO WEDNESDAY...AS WARM ADVECTION RETURNS ON THE BACKSIDE OF A SURFACE HIGH IN THE WESTERN GREAT LAKES. THE SOUTHERN HALF OF THE AREA STANDS THE BEST CHANCE OF SEEING THESE STORMS. THE ONLY DEFINITIVELY DRY PERIOD LOOKS TO OCCUR ON THURSDAY NIGHT...WHEN THE AREA WILL BE UNDER THE INFLUENCE OF HIGH PRESSURE IN THE NORTHERN PLAINS. FRIDAY NIGHT AND SATURDAY WILL FEATURE PROBABLY THE BEST CHANCE OF PRECIPITATION AFTER THE TONIGHT PERIOD. MODELS HAVE BEEN FAIRLY CONSISTENT IN BRINGING A WARM FRONT AND A SERIES OF SHORTWAVES THROUGH THE AREA DURING THIS TIME PERIOD. WE CONTINUE WITH HIGH CHANCE POPS ACROSS A FAIRLY LARGE PART OF THE AREA FROM FRIDAY NIGHT THROUGH SATURDAY NIGHT. AFTER THIS TIME FRAME...CONFIDENCE IS LOW...SO HAVE CONCEDED WITH THE HPC GUIDANCE GRIDS...KEEPING SLIGHT CHANCE TO LOW CHANCE POPS ACROSS AT LEAST A PORTION OF THIS AREA DURING THE REST OF THE FORECAST PERIOD. TEMPERATURES SHOULD CONTINUE AT NEAR TO SLIGHTLY BELOW NORMAL LEVELS...WITH THURSDAY AND FRIDAY BEING THE COOLEST PERIOD OVER THE NEXT 7 DAYS. ...KAT... && .AVIATION...FOR 00Z TAF ISSUANCE/ THE MAIN CHALLENGE WITH THE TAFS TONIGHT...IS TRYING TO TIME THE DEVELOPMENT OF THE CONVECTION(THUNDERSTORMS). CAP STILL FAIRLY STRONG ACROSS SOUTH CENTRAL MN...BUT IS EXPECTED TO WEAKEN EARLY THIS EVENING. NEW CONVECTION HAS ALREADY DEVELOPED ALONG AND NORTH OF THE WARM FRONT AT THIS TIME. ONCE THE CAP BREAKS...EXPECT NUMEROUS TSRA TO DEVELOP OR INITIATE OVER MUCH OF THE TAFS SITES. TSRA ACTIVITY EXPECTED TO DIMINISH AFTER 10 PM. CU FIELD OVR SE MN INTO ERN IA...WILL CONTINUE TO ADVECT NORTHWEST OVER CNTRL MN. CDFNT FCST TO MOVE THROUGH MOST OF THE TAF SITES BY EARLY TUESDAY MRNG. SKIES CLEARING BEHIND THE CDFNT. WILDFIRES OVR IDAHO...WILL BRING THE SMOKE ALOFT OVR MN AND WI LATER TONIGHT AND TUESDAY. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...NONE. WI...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 444 AM CDT MON AUG 13 2007 MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028- 140945- 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- YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA- REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH- WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK- ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE- 444 AM CDT MON AUG 13 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND SOUTH CENTRAL MINNESOTA...AND WEST CENTRAL WISCONSIN. .DAY ONE...TODAY AND TONIGHT LOW PRESSURE WILL MOVE ACROSS THE DAKOTAS TODAY PUSHING A WARM FRONT ACROSS THE OUTLOOK AREA. WARM AND MOIST AIR MOVING IN ALOFT WILL BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS ACROSS CENTRAL MINNESOTA INTO WEST CENTRAL WISCONSIN THIS AFTERNOON. IF THESE STORMS CAN DEVELOP...LARGE HAIL WILL BE POSSIBLE. THE GREATER THREAT FOR SEVERE THUNDERSTORMS WILL COME THIS EVENING AS THE LOW AND ASSOCIATED COLD FRONT REACH CENTRAL MINNESOTA. THUNDERSTORMS ARE EXPECTED TO DEVELOP EARLY THIS EVENING ACROSS CENTRAL MINNESOTA AND WEST CENTRAL WISCONSIN. AS STORMS DEVELOP LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREAT...WITH ISOLATED TORNADOES ALSO POSSIBLE. THE STORMS ARE THEN EXPECTED TO EVOLVE INTO A SQUALL LINE THROUGH THE EVENING AND MOVE SOUTHWARD. AS THIS LINE DEVELOPS THE MAIN THREAT WILL BECOME DAMAGING WINDS. TORRENTIAL DOWNPOURS WILL BE POSSIBLE WITH ANY STORMS THAT DEVELOP THIS AFTERNOON AND THIS EVENING. THIS MAY LEAD TO LOCALIZED PONDING OF WATER ON ROADWAYS AND LOW LYING AREAS. STAY ALERT FOR FURTHER UPDATES AND POSSIBLE WATCHES AND WARNINGS THROUGH THE AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE WILL BE A CHANCE FOR SHOWERS AND THUNDERSTORMS TUESDAY NIGHT ACROSS SOUTH CENTRAL MINNESOTA. AT THIS TIME...THESE STORMS ARE EXPECTED TO REMAIN BELOW SEVERE LIMITS. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION WILL BE POSSIBLE THIS AFTERNOON AND WILL LIKELY BE NEEDED THIS EVENING ACROSS CENTRAL MINNESOTA AND WEST CENTRAL WISCONSIN. MDB
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
853 PM CDT MON AUG 13 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM TSTM WND DMG MILACA 45.76N 93.65W
08/13/2007 MILLE LACS MN AMATEUR RADIO
20 INCH DIAMETER TREE DOWN.
&&
MCSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
903 PM CDT MON AUG 13 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0850 PM TSTM WND GST 8 NW ELK RIVER 45.41N 93.68W
08/13/2007 M62.00 MPH SHERBURNE MN TRAINED SPOTTER
EXTREME BLOWING DUST.
&&
MCSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
904 PM CDT MON AUG 13 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0855 PM HAIL ZIMMERMAN 45.44N 93.59W
08/13/2007 E1.00 INCH SHERBURNE MN AMATEUR RADIO
&&
MCSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
916 PM CDT MON AUG 13 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0852 PM HAIL 4 N SANTIAGO 45.62N 93.81W
08/13/2007 M1.00 INCH BENTON MN TRAINED SPOTTER
ESTIMATED WINDS OF 85 MPH. LARGE TREES DOWN.
&&
MCSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
922 PM CDT MON AUG 13 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0905 PM FUNNEL CLOUD BIG LAKE 45.34N 93.75W
08/13/2007 SHERBURNE MN LAW ENFORCEMENT
NEAR HWY. 25 IN BIG LAKE.
&&
MCSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
925 PM CDT MON AUG 13 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0923 PM HAIL COON RAPIDS 45.17N 93.31W
08/13/2007 E1.00 INCH ANOKA MN AMATEUR RADIO
AT MAIN STREET AND COON CREEK BLVD.
&&
MCSThe Minneapolis radar (KMPX), 105 km away, was scanning. The volume nearest the first event began at 02:24 UTC.
10 thunderstorm wind, 2 hail. Local standard time, as filed.
About two dozen trees were reported down across roads and power lines in a swath several miles wide.
A large swath of severe thunderstorm wind damage occurred from just west of New Richmond to the Glenwood City area, as determined by a National Weather Service damage survey. This swath of damage occurred within an approximately two to four mile width between these two cities. Numerous reports of damage were provided by the St. Croix County emergency manager, trained spotters, amateur radio operators and law enforcement. The New Richmond Airport AWOS also measured 60 knots at 2043 CST (two hangars were damaged). Some general reports include: 109 homes damaged or severely damaged, 48 barns damaged or severely damaged. In New Richmond, many 6 inch diameter or larger trees reported felled, and some light poles down throughout New Richmond; some roads were impassable due to downed trees; railroad crossing arms bent over at crossing. Some barns with significant damage reported on 140th Ave. (at residence numbers: 1703, 1793, 2540, 2578 and 2583). A roof torn off or other damages were reported on 160th St. (at residence numbers: 1593, 1769 and 1793), along with 1248 290th St. The back of a house was reported torn away at 2540 140th Ave., with another home damaged at 1506 County Road G. In Glenwood City, one to two foot diameter trees were reported down along with power lines. Two barns were reported destroyed near Emerald. A house was also rendered uninhabitable three miles east-southeast of New Richmond. One home at County G and GG was completely destroyed. Sheriff Dennis Hillstead said damage county wide was significant,and that it had been 10 to 12 years since the county had seen such widespread damage. The Luckwaldt Dairy north of Woodville received heavy damage, including ripping aprt the canvas covering to the barn. One cow was also lost. Significant damage was also reported at the Emeral Dairy in Emerald. Near Emerald Dairy, along county Highway G, barns, homes and corn fields were flattened. Power lines and trees were also toppled. The entire village of Hammond and some outlying areas were without power for approximately 12 hours Tuesday morning. Significant damage to Xcel Energy's electrical grid was reported during the early morning storms. A total of 24 transmission poles were broken or damaged and needed to be replaced across the Western Wisconsin. At the peak of the storm about 20,000 customers in western Wisconsin lost power from both high winds and lightning strikes. As reported by the following newspapers: Baldwin Bulletin, Hudson Star-Observer, County Today, Central St. Croix News, and the Courier Wedge.
In addition, measured 47 mph winds at 840 pm.
Tree felled onto house.
Two twelve inch pine trees downed.
Large four inch branches down at intersection of 29th and 21st St. Power lines and street lights were also downed in Menomonie.
Doors blown off building.
About one dozen trees down across town, including some on power lines and vehicles.
Few trees down.
Few trees down.
Numerous large trees down. Some 12 inches in diameter.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2007Every state in 2007This day in weather historyWarnings in Wisconsin, August 2007
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: 70859, 53189, 57634, 53190, 70865, 53197, 53198, 53200, 70862, 70864, 70863, 53201.