Alert archive / Michigan / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 76, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Jul 31, 1999, 2:04 PM EDT for Saint Clair County, Michigan. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 31, 1999, 2:04 PM EDT (18:04 UTC)
- Expired
- Jul 31, 1999, 2:30 PM EDT
- In force
- 26 min
- Issued by
- NWS Detroit, MI
- Area
- Whole counties
County Saint Clair County, MI
The radar
The Detroit radar (KDTX), 71 km from the middle of the area, began a volume at 18:07 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 31, 1:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 6.1 hours before the alert went out and 67 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 722 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 1477 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jul 31, 11:29 AM EDT, 2 hours 35 minutes earlier.
Area forecast discussion, Jul 31, 11:29 AM EDT, 2 hours 35 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Special weather statement, Jul 31, 11:53 AM EDT, 2 hours 11 minutes before
MIZ047>049-053>055-060>063-068>070-075-076-082-083-312300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 1153 AM EDT SAT JUL 31 1999 ...SEVERE WEATHER POTENTIAL STATEMENT FOR SOUTHEAST MICHIGAN... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. THUNDERSTORMS ARE LIKELY IN SOUTHEAST MICHIGAN THIS AFTERNOON... ESPECIALLY NEAR AND SOUTH OF INTERSTATE 69. SEVERAL OF THESE STORMS COULD BECOME SEVERE. SPOTTER ACTIVATION WILL PROBABLY BE NEEDED THIS AFTERNOON. A HOT AND HUMID AIRMASS WILL REMAIN ACROSS SOUTHEAST LOWER MICHIGAN THIS AFTERNOON. THE ATMOSPHERE WILL BE EXTREMELY UNSTABLE...AND THUNDERSTORM DEVELOPMENT IS EXPECTED AS A RESULT. ALTHOUGH THUNDERSTORMS ARE POSSIBLE ANYWHERE IN SOUTHEAST MICHIGAN...THE BEST CHANCE FOR STORMS WILL BE NEAR AND SOUTH OF INTERSTATE 69...WHERE THE ATMOSPHERE IS MOST UNSTABLE. THUNDERSTORM DEVELOPMENT COULD OCCUR AT ANY TIME THIS AFTERNOON. ANY THUNDERSTORMS THAT DEVELOP COULD BECOME SEVERE. THE GREATEST THREAT WILL BE FROM DAMAGING WINDS...WITH GUSTS TO 70 MPH POSSIBLE. HAIL UP TO ONE INCH IN DIAMETER IS ALSO POSSIBLE. IN ADDITION...EXTREMELY HEAVY RAINFALL AND ALMOST CONTINUOUS LIGHTNING IS POSSIBLE WITH ANY THUNDERSTORM TODAY. THUNDERSTORMS TODAY WILL MOVE EAST AT 35 MPH. THE THUNDERSTORM THREAT WILL DIMINISH GREATLY EARLY THIS EVENING. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE MEDIA OUTLET... FOR THE LATEST INFORMATION ON THIS WEATHER SITUATION. ZOLTOWSKI
Special weather statement, Jul 31, 1:10 PM EDT, 54 minutes before
MIZ047>049-053>055-060>063-068>070-075-076-082-083-312200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 110 PM EDT SAT JUL 31 1999 ...SEVERE WEATHER POTENTIAL STATEMENT FOR SOUTHEAST MICHIGAN... ...SEVERE THUNDERSTORM WATCH 615 IS IN EFFECT FOR MOST OF SOUTHEAST LOWER MICHIGAN UNTIL 6 PM... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR MOST OF SOUTHEAST LOWER MICHIGAN. THIS WATCH RUNS UNTIL 6 PM...AND INCLUDES THE FOLLOWING COUNTIES... SAGINAW...TUSCOLA...SANILAC...SHIAWASSEE...GENESEE...LAPEER... ST CLAIR...LIVINGSTON...OAKLAND...MACOMB...WASHTENAW...WAYNE... LENAWEE...AND MONROE. SOME CITIES IN THE SEVERE THUNDERSTORM WATCH INCLUDE... SAGINAW...SANDUSKY...FLINT...PORT HURON...ANN ARBOR... DETROIT...AND ADRIAN. THUNDERSTORMS WERE DEVLOPING RAPIDLY ALONG A LINE FROM SOUTHERN LAKE HURON TO NORTHWEST INDIANA. THIS LINE WILL MOVE EAST AT 35 MPH...AND AFFECT THE SEVERE THUNDERSTORM WATCH AREA DURING THE MID TO LATE AFTERNOON HOURS. THE LINE OF THUNDERSTORMS WILL MOVE EAST OF THE AREA BY EARLY EVENING. EXPECT WIND GUSTS TO 70 MPH AND HAIL TO ONE INCH IN DIAMETER WITH THE SEVERE THUNDERSTORMS. IN ADDITION...THE STORMS WILL PRODUCE TORRENTIAL RAINFALL AND ALMOST CONTINUOUS LIGHTNING. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE MEDIA OUTLET... FOR THE LATEST INFORMATION ON THIS WEATHER SITUATION. ZOLTOWSKI
Special weather statement, Jul 31, 1:10 PM EDT, 54 minutes before
MIZ047>049-053>055-060>063-068>070-075-076-082-083-312200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 110 PM EDT SAT JUL 31 1999 ...SEVERE WEATHER POTENTIAL STATEMENT FOR SOUTHEAST MICHIGAN... ...SEVERE THUNDERSTORM WATCH 615 IS IN EFFECT FOR MOST OF SOUTHEAST LOWER MICHIGAN UNTIL 6 PM... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR MOST OF SOUTHEAST LOWER MICHIGAN. THIS WATCH RUNS UNTIL 6 PM...AND INCLUDES THE FOLLOWING COUNTIES... SAGINAW...TUSCOLA...SANILAC...SHIAWASSEE...GENESEE...LAPEER... ST CLAIR...LIVINGSTON...OAKLAND...MACOMB...WASHTENAW...WAYNE... LENAWEE...AND MONROE. SOME CITIES IN THE SEVERE THUNDERSTORM WATCH INCLUDE... SAGINAW...SANDUSKY...FLINT...PORT HURON...ANN ARBOR... DETROIT...AND ADRIAN. THUNDERSTORMS WERE DEVLOPING RAPIDLY ALONG A LINE FROM SOUTHERN LAKE HURON TO NORTHWEST INDIANA. THIS LINE WILL MOVE EAST AT 35 MPH...AND AFFECT THE SEVERE THUNDERSTORM WATCH AREA DURING THE MID TO LATE AFTERNOON HOURS. THE LINE OF THUNDERSTORMS WILL MOVE EAST OF THE AREA BY EARLY EVENING. EXPECT WIND GUSTS TO 70 MPH AND HAIL TO ONE INCH IN DIAMETER WITH THE SEVERE THUNDERSTORMS. IN ADDITION...THE STORMS WILL PRODUCE TORRENTIAL RAINFALL AND ALMOST CONTINUOUS LIGHTNING. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE MEDIA OUTLET... FOR THE LATEST INFORMATION ON THIS WEATHER SITUATION. ZOLTOWSKI
The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 1:21 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 39 min |
| Jul 31, 1:34 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 41 min |
| Jul 31, 2:25 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Washtenaw | 50 min |
| Jul 31, 2:47 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 43 min |
| Jul 31, 2:56 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 49 min |
| Jul 31, 3:03 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 57 min |
| Jul 31, 3:29 PM EDT | Tornado Warning | DTX | Oakland | 16 min |
| Jul 31, 3:31 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Monroe | 44 min |
| Jul 31, 3:33 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 42 min |
| Jul 31, 3:40 PM EDT | Tornado Warning | DTX | Wayne | 20 min |
| Jul 31, 3:45 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 45 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1999Every severe thunderstorm warning in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.