4 marine thunderstorm wind, as filed by the National Weather Service.
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 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 Gaylord, MI wrote its last area forecast discussion before the first event at Aug 20, 9:02 PM EST, 2 hours 43 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GAYLORD MI 1002 PM EDT SAT AUG 20 2005 .UPDATE...COLD FRONT HAS REACHED SAGINAW BAY...AND ALL CONVECTION THAT DEVELOPED ALONG AND AHEAD OF IT HAS EXITED EAST INTO LAKE HURON AND SRN ONTARIO. SKIES ARE NOW PARTLY TO MOSTLY CLEAR ACROSS THE ENTIRE CWA. A LONE SHOWER HAS POPPED UP OVER THE PAST HOUR OR SO JUST WEST OF THE STRAITS AREA ALONG THE NRN LAKE MICHIGAN SHORELINE OF MACKINAC COUNTY. REGIONAL SURFACE OBS INDICATE A SECONDARY COLD FRONT EXTENDING FROM ERN UPR MICHIGAN THRU NRN LAKE MICHIGAN...WHICH IS LIKELY DRIVING THIS NEWLY DEVELOPED SHOWER. PRIMARY DIFFERENCE IN AIRMASS BEHIND THIS SECONDARY BOUNDARY IS A DROP IN SURFACE DWPTS OF AROUND 10 TO 15 DEGREES. LATEST MESOETA DOES ELUDE TO THIS FEATURE...COMPLETE WITH SOME DPVA AND ENHANCED MOISTURE ALONG IT. WILL UPDATE THE GRIDDED AND WORDED FORECAST TO REFLECT THE CHANCE OF SHOWERS FOR THE REMAINDER OF THE NIGHT FOR ERN UPR AND ADD A CHANCE TO FAR NRN LOWER MICHIGAN ALONG AND NORTH OF M 32. WILL ALSO SLIGHTLY ADJUST WX AND POPS GRIDS FOR SUNDAY MORNING TO PUSH A CHANCE OF SHOWERS FURTHER EAST INTO THE ALPENA AREA. .PREV DISCUSSION...ISSUED 403 PM EDT SAT AUG 20 2005 DISCUSSION...SOME CLEARING/HEATING OVER THE WESTERN HALF OF THE CWA COMBINED WITH MID LEVEL COOLING/DRYING COMING IN OVERHEAD HAS LED TO A NARROW AXIS OF INSTABILITY AHEAD OF THE FRONT WITH LAPS ANALYSIS INDICATING UP TO 1200 J/KG OF SFC BASED CAPE NEAR LAKE MICHIGAN. INSTABILITY DROPS OFF QUICKLY OVER THE EASTERN HALF OF THE CWA AND UNCLEAR JUST HOW MUCH DESTABILIZATION WILL OCCUR OVER THIS AREA BEFORE THE FRONT PRESSES THROUGH. NONETHELESS...WILL NEED TO CARRY SCT-NMRS POPS ACROSS THE CWA FOR THE FIRST FEW HOURS OF THE FORECAST AS THE FRONT MOVES THROUGH ALTHOUGH CONVECTION MAY WEAKEN AS IT MOVES INTO MORE STABLE REGIME IN THE EAST. AS FAR AS SEVERE WEATHER IS CONCERNED EARLY THIS EVENING...SOME POTENTIAL REMAINS FOR STORM ORGANIZATION WITH 50+ KNOTS AT 500 MB AND 0-6KM BULK SHEAR VALUES AROUND 50 KNOTS. UNIDIRECTIONAL FLOW REGIME SUGGESTS MAIN THREAT WILL BE BOWING SEGMENTS/WIND ISSUES AND POTENTIAL FOR HAIL IN THE BETTER ORGANIZED STORMS (HAIL THREAT BEST ACROSS EASTERN UPPER MICHIGAN WHERE FREEZING LEVELS ALREADY IN THE PROCESS OF LOWERING). WILL CONTINUE TO HIGHLIGHT THIS SEVERE WEATHER THREAT THIS EVENING IN THE HAZARDOUS WEATHER OUTLOOK. THEN...AFTER INITIAL COLD FRONT MOVES THROUGH EARLY THIS EVENING ANTICIPATE A PERIOD OF CLEARING SKIES FOR THE BALANCE OF THE EVENING BEFORE SECOND UPSTREAM FRONT AND COOLER AIR BEGINS TO OVERSPREAD THE REGION. 850 MB TEMPS FORECAST TO DIP INTO THE SINGLE DIGITS ACROSS UPPER MICHIGAN TOWARD MORNING PRODUCING LAKE-850 MB DELTA TS >12C...ALONG WITH DEEPER LOW LEVEL MOISTURE WRAPPING DOWN ACROSS UPPER MICHIGAN BEHIND THE DEPARTING LOW. THUS...CERTAINLY EXPECT LAKE CLOUDS TO INCREASE OVERNIGHT AND CURRENT CHANCE FOR RAIN SHOWERS IN EASTERN UPPER MICHIGAN TOWARD MORNING LOOKS FINE. MAY ALSO SEE LOW CLOUDS REDEVELOP OVER NRN LOWER MICHIGAN OVERNIGHT WITH THE COOL AIR SLIPPING DOWN OVER THE MOIST/WARM BOUNDARY LAYER. SUNDAY...JUST YOUR TYPICAL MID AUGUST FALL DAY AS 850 MB TEMPS DIP TO AROUND +5C DURING THE DAY AND LOW LEVEL MOISTURE SPILLS ACROSS ALL OF NRN MICHIGAN. SO SCT LAKE ENHANCED RAIN SHOWERS A GOOD BET FROM LATE MORNING ONWARD. WOULD NORMALLY BE INCLINED TO NUDGE UP POPS OVER NW LOWER MICHIGAN DURING THE AFTERNOON WITHIN THE PREVAILING WNW/NW FLOW REGIME OFF THE LAKE. BUT AS NOTED BY MIDNIGHT FORECAST DISCUSSION...FORECAST INVERSION HEIGHTS NOT TERRIBLY IMPRESSIVE AND WILL MAINTAIN THE HIGH CHANCE POPS FOR NOW. OTHERWISE...CERTAINLY A CLOUDY DAY WITH TEMPS IN THE LOWER/MID 60S IMMEDIATELY DOWNWIND OF THE LAKE AND UPPER 60S TO LOWER 70S FOR THE EASTERN PORTION OF THE CWA. ADAM IN SUMMARY...EXPECT A COOL START TO THE LONGER RANGE FORECAST PERIOD FOLLOWED BY A GRADUAL WARMING TREND ALONG WITH DRY WEATHER FOR A FEW DAYS. SUNDAY NIGHT INTO MONDAY...THE UPPER LEVEL TROUGH CONTINUES TO LINGER ACROSS THE GREAT LAKES REGION LEADING TO COOL TEMPERATURES ALONG WITH A CONTINUED CHANCE OF SHOWERS. MEANWHILE...GFS MEAN 1000-500 MB RH REMAINS BETWEEN 55 AND 65 PERCENT (WHILE THE NAM APPEARS TO BE BRINGING IN DRY AIR FROM THE NORTH TOO QUICKLY ESPECIALLY ON MONDAY). SO THE COMBINATION OF LAKE EFFECT AND DIURNALLY DRIVEN SHOWERS (DURING THE DAY MONDAY) WILL CONTINUE. AFTER FALLING TO NEAR 5C SUNDAY NIGHT...850 MB TEMPERATURES MODERATE BY A DEGREE OR TWO ON MONDAY. WIDESPREAD CLOUD COVER SUNDAY NIGHT IS EXPECTED TO KEEP TEMPERATURES FROM BOTTOMING OUT WITH LOWS RANGING FROM AROUND 50 INTO THE LOWER 50S. MEANWHILE HIGHS ON MONDAY IN THE MIDDLE AND UPPER 60S SHOULD WORK. IN ADDITION...THERE WILL BE BRISK NORTHWEST WINDS OF 10 TO 20 MPH. LASTLY...WILL NOT INCLUDE A CHANCE OF WATER SPOUTS ACROSS THE NEAR SHORE AREAS AS IT APPEARS THAT IT WILL BE JUST UNDER CONVECTIVE CLOUD HEIGHT AND LAKE-850 MB DELTA TS THRESHOLDS. MONDAY NIGHT...GFS AND THE NAM ARE IN BETTER AGREEMENT THAT DRIER AIR WILL FINALLY ADVECT IN FROM THE NORTH (MEAN 1000-500 MB RH FALLS TO LESS THAN 50 PERCENT). SO EXPECT CLOUDS TO DISSIPATE THROUGH THE NIGHT ALLOWING TEMPERATURES TO FALL INTO THE CHILLY 40S. TUESDAY THROUGH THURSDAY...THE TROUGH PUSHES OFF TO THE EAST OF THE REGION ALLOWING FOR INCREASING RIDGING AT THE SURFACE AND ALOFT TO BUILD IN FROM THE WEST. 850 MB TEMPERATURES WILL INCREASE BY A COUPLE OF DEGREES EACH DAY AS WELL ALLOWING FOR A SLOW WARMING TREND. HIGHS IN THE LOWER AND MIDDLE 70S ON TUESDAY ARE EXPECTED TO WARM INTO THE UPPER 70S AND LOWER 80S ON THURSDAY. LIGHT WINDS AND MOSTLY CLEAR SKIES WILL ALLOW FOR COOL TEMPERATURES AT NIGHT (40S TO LOWER 50S). NO PRECIPITATION IS EXPECTED THOUGH THIS PERIOD. FRIDAY AND SATURDAY...EXTENDED MODELS ARE SLOWING DOWN A TROUGH FOR THE END OF NEXT WEEKEND INTO NEXT WEEKEND. AS A MATTER OF FACT...THE GFS IS NOW KEEPING THIS TROUGH TO OUR NORTH WITH LITTLE NOTICEABLE IMPACT. HOWEVER...A SURFACE WEAK COLD FRONT MAY EVENTUALLY PUSH ACROSS THE REGION AS EARLY AS LATE FRIDAY BUT MORE LIKELY ON SATURDAY. HAVE PULLED CHANCE POPS OUT OF EASTERN ZONES FOR FRIDAY DUE TO THE SLOWER TIMING/UNCERTAINTY WHICH LINES UP WITH DTX TO THE EAST. HAVE GONE WITH CHANCE POPS ALL ZONES ON SATURDAY WITH THE DETAILS TO BE WORKED OUT AS THE MODELS COME INTO BETTER AGREEMENT. HIGHS EXPECTED TO BE IN THE WARM UPPER 70S AND LOWER 80S ON FRIDAY WITH A FEW DEGREE COOL OFF ON SATURDAY BEHIND THE FRONT. SULLIVAN && .APX...WATCHES/WARNINGS/ADVISORIES...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GAYLORD MI 1017 PM EDT SAT AUG 20 2005 MIZ008-015>036-041-042-LSZ321-322-LMZ323-341-342-344-345- LHZ345>349-211000- ALCONA-ALPENA-ANTRIM-ARENAC-BENZIE-CHARLEVOIX-CHEBOYGAN-CHIPPEWA- CRAWFORD-EMMET-GLADWIN-GRAND TRAVERSE-IOSCO-KALKASKA-LEELANAU- MACKINAC-MANISTEE-MISSAUKEE-MONTMORENCY-OGEMAW-OSCODA-OTSEGO- PRESQUE ISLE-ROSCOMMON-WEXFORD...INCLUDING THE ADJACENT WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN...LAKE HURON...AND LAKE SUPERIOR 1017 PM EDT SAT AUG 20 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN LOWER AND EASTERN UPPER MICHIGAN. .DAY ONE...OVERNIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY WATERSPOUTS ARE POSSIBLE THROUGH THE DAY SUNDAY ON WHITEFISH BAY AND THE SAINT MARYS RIVER...AND SUNDAY AFTERNOON AND EVENING WITHIN LAKE MICHIGAN AND LAKE HURON NEARSHORE WATERS. THUNDERSTORMS ARE POSSIBLE ACROSS NORTHERN MICHIGAN ON FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THROUGH EARLY THIS EVENING. && MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING URL: HTTP://WWW.WEATHER.GOV/GAYLORD (ALL LOWER CASE) JPB/ADAM/MLR
The NCL Michigan radar (KAPX), 107 km away, was scanning. The volume nearest the first event began at 04:46 UTC.
4 marine thunderstorm wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Huron in 2005Every state in 2005This day in weather history
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: 5472909, 5472910, 5472911, 5472912.