Marine Thunderstorm Wind, Detroit River
- When
- August 4, 6:00 PM EST
- Where
- Detroit River marine zone, Wyandotte
- Measured
- 46 kt (53 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 42.200, -83.167
Marine Thunderstorm Wind in Lake St. Clair, August 4, 2002
1 marine thunderstorm wind, as filed by the National Weather Service.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
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.
What forecasters said that day
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 Detroit, MI wrote its last area forecast discussion before the first event at Aug 4, 2:38 PM EST, 3 hours 22 minutes earlier.
Area forecast discussion, Aug 4, 2:38 PM EST, 3 hours 22 minutes before
SOUTHEAST MICHIGAN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 337 PM SUN AUG 4 2002 MAIN CONCERN FOR THE CURRENT PACKAGE WILL BE HERE IN THE FIRST 12 TO 18 HOURS OR SO. STILL CONTINUE TO MONITOR SEVERE CHANCES ACROSS SOUTHERN HALF OF THE CWA. AS HAS BEEN PREVIOUSLY DISCUSSED... CURRENT SEVERE CHANCES HINGE ON ABILITY OF ATMOSPHERE TO BREAK THE CAP CURRENTLY IN PLACE. CONVECTION THAT HAS INITIATED OVER SW LOWER HAS CONSISTENTLY FELL APART AS IT APPROACHED THE CWA THIS AFTERNOON. STILL BELIEVE THAT CAP WILL ERODE THIS EVENING AS WEAK SHORT WAVE TROUGH LOWERS HEIGHTS AND BRINGS SLIGHTLY COOLER TEMPERATURES TO THE MID LEVELS SUFFICIENT. VISIBLE SATELLITE LOOP SHOWING PLENTY OF SUNSHINE ACROSS THE CWA AND THIS HAS BOOSTED TEMPERATURES TO NEAR 90 SOUTHERN CWA WITH DEW POINTS IN THE LOW TO MID 70S YIELDING CAPES APPROACHING 4 KJ/KG. DIFFICULT TO DISCERN OUTFLOW BOUNDARIES IN THE DATA ALTHOUGH IT DOES APPEAR AT LEAST ONE OUTFLOW HAS SLID INTO NORTHERN OHIO. OTHER BOUNDARIES LIKELY ACROSS THE NORTHERN CWA WHERE DIFFERENTIAL HEATING FROM MORNING RAIN/CLOUDS INTERACTING WITH AFTERNOON SUNSHINE. FOR THIS EVENING...WILL CARRY SCATTERED SHOWERS AND THUNDERSTORMS CWA-WIDE. AVN AND ETA ARE IN AGREEMENT THAT FRONT HANGS UP NEAR THE OH/MI BORDER OVERNIGHT AND MCS DEVELOPING OVER IL TRACKS ALONG THE FRONT AND ACROSS SOUTHERN LOWER DURING THE PRE-DAWN TO POST-DAWN HOURS MONDAY. THE SYSTEM WILL TRACK IN A POOL OF RICH MOISTURE AS PWS WILL EXCEED 2 INCHES ACROSS SOUTHERN CWA DURING THE EARLY MORNING HOURS...WITH K-INDICES NEAR 40. LOW LEVEL JET DYNAMICS ARE NOT IMPRESSIVE WITH FLOW TO OUR WEST NEVER REALLY GETTING STRONGER THAN 20 KNOTS...AND THEN BECOMING PARALLEL TO THE FRONT RATHER THAN PERPENDICULAR. UPPER LEVEL JET DYNAMICS ARE LACKING AS WELL. STILL GIVEN JUICY AIR...A PERIOD OF HEAVY RAIN IS POSSIBLE AND WILL ADD MENTION OF THIS TO THE ZONES. TIMING ON THIS PRECIPITATION WOULD BE AFTER MIDNIGHT...MOST LIKELY TOWARD SUNRISE. BY TOMORROW AFTERNOON...STRONG CANADIAN HIGH TO DOMINATE THE WEATHER THROUGH THE REMAINDER OF THE WEEK. HIGH WILL BUILD IN SHUNTING FRONT TO THE SOUTH AND BRING A PROLONGED PERIOD OF DRY COOL WEATHER. ONLY CONCERN WITH THIS SYSTEM WILL BE MONDAY NIGHT INTO TUESDAY MORNING. 850MB TEMPERATURES ARE PROGGED TO DROP AS LOW AS 3C /PER ETA/ ACROSS THE THUMB TUESDAY MORNING. WITH LAKE TEMPERATURES RUNNING AROUND 23C...THE AIR/LAKE DELTA T WILL BE AROUND 20C. INVERSION HEIGHTS WILL BE AROUND 5K FEET. AIR ABOVE THE INVERSION WILL BE EXTREMELY DRY. FLOW AROUND THE HIGH WILL BE ANTICYCLONIC. MESOETA OVERSPREADS NEARLY THE ENTIRE CWA MONDAY NIGHT INTO TUESDAY MORNING WITH LAKE INDUCED CLOUD COVER. AIR/LAKE DELTA T/S CERTAINLY SUPPORT SOME CLOUD DEVELOPMENT...BUT WITH EXTREME DRY AIR ABOVE THE INVERSION AND ANTICYCLONIC LOW LEVEL FLOW WILL ONLY OPT FOR PARTLY CLOUDY SKIES OVERNIGHT MONDAY INTO TUESDAY MORNING. EXTENDED... HIGH PRESSURE AT THE SURFACE AND ALOFT WILL DOMINATE THE EXTENDED PERIOD INTO NEXT WEEKEND. DESPITE HEIGHTS BUILDING IN EXCESS OF 588DM THROUGH THE PERIOD...STRONG CANADIAN HIGH PRESSURE WILL MAINTAIN NEAR SEASONABLE THICKNESS LEVELS INTO THE WEEKEND. MRF AND CANADIAN DEVELOP A SHARP UPPER NORTH-SOUTH SHORTWAVE ACROSS THE CENTRAL U.S. THAT EVENTUALLY EXTENDS ACROSS THE WIDTH OF THE NATION BY MONDAY MORNING. ENSEMBLE MEMBERS OF BOTH CANADIAN AND MRF SUGGEST THAT THE OPERATIONAL SOLUTIONS ARE OVERPLAYING THIS FEATURE. THIS SOLUTION WOULD TEND TO ENHANCE RIDGING ACROSS THE LAKES AND SLOW DOWN ANY FRONTS APPROACHING. DESPITE THE OUTLIER NATURE OF THE TROUGH SOLUTION...ENSEMBLE MEMBERS DO HOLD ONTO THE RIDGE REMAINING IN PLACE ACROSS THE LAKES AND POINTS EAST. SO...A CONTINUED DRY FORECAST INTO THE WEEKEND SEEMS PLAUSIBLE. WITH FLOW TURNING SOUTHWEST DEW POINTS WILL BE ON THE INCREASE FOR THE WEEKEND AND A WARMING TREND UNDERWAY. .DTX...NONE. OKEEFE
In the hours before
Special weather statement, Aug 4, 3:16 PM EST, 2 hours 44 minutes before
MIZ047>049-053>055-060>063-068>070-075-076-082-083-050000- HAZARDOUS WEATHER OUTLOOK FOR SOUTHEAST MICHIGAN NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 416 PM EDT SUN AUG 4 2002 ...SEVERE THUNDERSTORM WATCH 574 IN EFFECT FOR PART OF SOUTHEAST LOWER MICHIGAN UNTIL 8 PM SUNDAY NIGHT... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. HAZARDS... A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR PART OF SOUTHEAST MICHIGAN. COUNTIES IN THE WATCH INCLUDE SHIAWASSEE...GENESEE... LAPEER...ST CLAIR...LIVINGSTON...OAKLAND...MACOMB...WASHTENAW... WAYNE...LENAWEE AND MONROE. SOME COMMUNITIES IN THE WATCH ARE OWOSSO...FLINT...LAPEER...PORT HURON...HOWELL...PONTIAC...MOUNT CLEMENS...ANN ARBOR...DETROIT...ADRIAN...AND MONROE. SCATTERED THUNDERSTORMS WILL OCCUR IN THE WATCH AREA THIS EVENING AND SOME OF THESE STORMS MAY BE SEVERE. WINDS IN EXCESS OF 70 MPH ARE POSSIBLE WITH THESE STORMS. DISCUSSION... A COLD FRONT WILL SLOWLY ADVANCE ACROSS SOUTHEAST MICHIGAN THIS EVENING. THIS FRONT WILL TAP THE WARM HUMID AIR IN PLACE ACROSS THE REGION...PRODUCING SCATTERED THUNDERSTORMS. SOME OF THESE STORMS MAY BE SEVERE THIS EVENING PRODUCING WIND GUSTS TO 70 MPH. THE THREAT OF SEVERE WEATHER WILL BE FOCUSED ALONG AND SOUTH OF I 69 THROUGH 8 PM THESE EVENING. SPOTTER ACTIVATION... SPOTTER ACTIVATION HAS OCCURRED. OUTLOOK FOR MONDAY AND TUESDAY. NO HAZARDS ARE EXPECTED. STAY TUNED TO NOAA WEATHER RADIO... OR LOCAL MEDIA OUTLETS... FOR THE LATEST FORECAST INFORMATION FROM THE NATIONAL WEATHER SERVICE. YOU CAN ALSO OBTAIN THE LATEST FORECAST ON THE NATIONAL WEATHER SERVICE WEB SITE. HTTP://WWW.CRH.NOAA.GOV/DTX/ (ALL LOWER CASE) OKEEFE
Special weather statement, Aug 4, 5:48 PM EST, 12 minutes before
MIZ047>049-053>055-060>063-068>070-075-076-082-083-050000- HAZARDOUS WEATHER OUTLOOK FOR SOUTHEAST MICHIGAN NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 648 PM EDT SUN AUG 4 2002 ...SEVERE THUNDERSTORM WATCH CANCELLED FOR COUNTIES ALONG AND NORTH OF M 59... ...SEVERE THUNDERSTORM WATCH 574 IN EFFECT FOR SOUTHERN PORTIONS OF SOUTHEAST LOWER MICHIGAN UNTIL 8 PM... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. HAZARDS... THUNDERSTORMS HAVE CLEARED COUNTIES ALONG AND NORTH OF THE M 59 CORRIDOR. THEREFORE...THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES...SHIAWASSEE...GENESEE... LAPEER...ST CLAIR...LIVINGSTON...OAKLAND...AND MACOMB. THIS INCLUDES THE COMMUNITIES OF OWOSSO...FLINT...LAPEER...PORT HURON...HOWELL... PONTIAC...AND MOUNT CLEMENS. THE WATCH CONTINUES UNTIL 8 PM FOR..WASHTENAW...WAYNE...LENAWEE AND MONROE COUNTIES. SOME COMMUNITIES IN THE WATCH INCLUDE ANN ARBOR... DETROIT...ADRIAN...AND MONROE. SCATTERED THUNDERSTORMS WILL OCCUR IN THE WATCH AREA THIS EVENING AND SOME OF THESE STORMS MAY BE SEVERE. WINDS IN EXCESS OF 70 MPH ARE POSSIBLE WITH THESE STORMS. DISCUSSION... A COLD FRONT WILL SLOWLY ADVANCE ACROSS SOUTHEAST MICHIGAN THIS EVENING. THIS FRONT WILL TAP THE WARM HUMID AIR IN PLACE ACROSS THE REGION...PRODUCING SCATTERED THUNDERSTORMS. SOME OF THESE STORMS MAY BE SEVERE THIS EVENING PRODUCING WIND GUSTS TO 70 MPH. THE THREAT OF SEVERE WEATHER WILL BE FOCUSED ALONG AND SOUTH OF I 69 THROUGH 8 PM THESE EVENING. SPOTTER ACTIVATION... SPOTTER ACTIVATION HAS OCCURRED. OUTLOOK FOR MONDAY AND TUESDAY. NO HAZARDS ARE EXPECTED. STAY TUNED TO NOAA WEATHER RADIO... OR LOCAL MEDIA OUTLETS... FOR THE LATEST FORECAST INFORMATION FROM THE NATIONAL WEATHER SERVICE. YOU CAN ALSO OBTAIN THE LATEST FORECAST ON THE NATIONAL WEATHER SERVICE WEB SITE. HTTP://WWW.CRH.NOAA.GOV/DTX/ (ALL LOWER CASE) OKEEFE
Special weather statement, Aug 4, 5:59 PM EST, 1 minute before
MIZ047>049-053>055-060>063-068>070-075-076-082-083-050000- HAZARDOUS WEATHER OUTLOOK FOR SOUTHEAST MICHIGAN...CORRECTED NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 659 PM EDT SUN AUG 4 2002 CORRECTED TO UPDATE AREA OF SEVERE THREAT IN DISCUSSION. ...SEVERE THUNDERSTORM WATCH CANCELLED FOR COUNTIES ALONG AND NORTH OF M 59... ...SEVERE THUNDERSTORM WATCH 574 IN EFFECT FOR SOUTHERN PORTIONS OF SOUTHEAST LOWER MICHIGAN UNTIL 8 PM... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. HAZARDS... THUNDERSTORMS HAVE CLEARED COUNTIES ALONG AND NORTH OF THE M 59 CORRIDOR. THEREFORE...THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES...SHIAWASSEE...GENESEE... LAPEER...ST CLAIR...LIVINGSTON...OAKLAND...AND MACOMB. THIS INCLUDES THE COMMUNITIES OF OWOSSO...FLINT...LAPEER...PORT HURON...HOWELL... PONTIAC...AND MOUNT CLEMENS. THE WATCH CONTINUES UNTIL 8 PM FOR..WASHTENAW...WAYNE...LENAWEE AND MONROE COUNTIES. SOME COMMUNITIES IN THE WATCH INCLUDE ANN ARBOR... DETROIT...ADRIAN...AND MONROE. SCATTERED THUNDERSTORMS WILL OCCUR IN THE WATCH AREA THIS EVENING AND SOME OF THESE STORMS MAY BE SEVERE. WINDS IN EXCESS OF 70 MPH ARE POSSIBLE WITH THESE STORMS. DISCUSSION... A COLD FRONT WILL SLOWLY ADVANCE ACROSS SOUTHEAST MICHIGAN THIS EVENING. THIS FRONT WILL TAP THE WARM HUMID AIR IN PLACE ACROSS THE REGION...PRODUCING SCATTERED THUNDERSTORMS. SOME OF THESE STORMS MAY BE SEVERE THIS EVENING PRODUCING WIND GUSTS TO 70 MPH. THE THREAT OF SEVERE WEATHER WILL BE FOCUSED ALONG AND SOUTH OF I 94 THROUGH 8 PM THESE EVENING. SPOTTER ACTIVATION... SPOTTER ACTIVATION HAS OCCURRED. OUTLOOK FOR MONDAY AND TUESDAY. NO HAZARDS ARE EXPECTED. STAY TUNED TO NOAA WEATHER RADIO... OR LOCAL MEDIA OUTLETS... FOR THE LATEST FORECAST INFORMATION FROM THE NATIONAL WEATHER SERVICE. YOU CAN ALSO OBTAIN THE LATEST FORECAST ON THE NATIONAL WEATHER SERVICE WEB SITE. HTTP://WWW.CRH.NOAA.GOV/DTX/ (ALL LOWER CASE) OKEEFE
The radar
The Detroit radar (KDTX), 61 km away, was scanning. The volume nearest the first event began at 23:00 UTC.
Event by event
1 marine thunderstorm wind. Local standard time, as filed.
What these are
- Marine Thunderstorm Wind
- Thunderstorm winds of 34 knots or more over coastal or lake waters.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Rip Current in Florida, August 4, 2002
- Hail and Damaging Winds in Montana, August 4, 2002
- Damaging Winds in Texas, August 4, 2002
- Damaging Winds in Ohio, August 4, 2002
- Damaging Wind in Texas, August 4, 2002
- Wildfire in California, August 4, 2002
- Hail and Damaging Winds in Michigan, August 4, 2002
- Damaging Winds in Kansas, August 4, 2002
- Tropical Storm in Louisiana, August 4 to 5, 2002
- Lightning Strike in Texas, August 4, 2002
- Damaging Wind in Ohio, August 4, 2002
- Tropical Storm in Mississippi, August 4 to 5, 2002
More
Every storm in Lake St. Clair in 2002Every state in 2002This day in weather history
Sources
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: 5309795.