Alert archive / Michigan / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 116, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 21, 1998, 8:03 PM EDT for Calhoun County, Michigan. It was in force for 47 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 21, 1998, 8:03 PM EDT (00:03 UTC)
- Expired
- Jul 21, 1998, 8:50 PM EDT
- In force
- 47 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Whole counties
County Calhoun County, MI
The radar
The Grand Rapids radar (KGRR), 84 km from the middle of the area, began a volume at 00:05 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 21, 4:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 0.1 hours before the alert went out and 140 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
- 23 J/kg
- Mixed-layer CIN
- -374 J/kg
- Mixed-layer LCL
- 1967 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 247 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 11:30 PM EDT, 20 hours 33 minutes earlier.
Area forecast discussion, Jul 20, 11:30 PM EDT, 20 hours 33 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1130 PM EDT MON JUL 20 1998 AFTER COORDINATING WITH SPC WILL DRP WATCH AS LINE CONTINUES TO WEAKEN. SINCE UPDATING ZONES... MAKES SENSE TO DROP WATCH AT SAME TIME. STORMS COMING IN FRM WI WILL HAVE ELEVATED CONVECTION THIS LESS LIKELY TO REACH GROUND AS SEVERE OVERNIGHT. WDM
In the hours before
Special weather statement, Jul 21, 6:25 PM EDT, 1 hour 38 minutes before
MIZ043>046-050>052-056-057-220000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 625 PM EDT TUE JUL 21 1998 THE NATIONAL WEATHER SERVICE HAS CANCELLED THE SEVERE THUNDERSTORM WATCH FOR THE FOLLOWING COUNTIES: IN WEST CENTRAL LOWER MICHIGAN: MUSKEGON NEWAYGO OCEANA IN CENTRAL LOWER MICHIGAN: GRATIOT ISABELLA MECOSTA MONTCALM IN SOUTHWEST LOWER MICHIGAN: KENT OTTAWA THE WATCH HAS BEEN CANCELLED FOR PORTIONS OF WEST CENTRAL AND CENTRAL LOWER MICHIGAN...BUT REMAINS IN EFFECT GENERALLY SOUTH OF A ST. JOHNS TO HOLLAND LINE UNTIL 900 PM EDT. AT 625 PM EDT...GRAND RAPIDS DOPPLER RADAR INDICATED THE SEVERE THUNDERSTORMS THAT MOVED THROUGH MUCH OF SOUTHWEST LOWER MICHIGAN HAD RACED EAST TOWARD THE DETROIT METROPOLITAN AREA. SCATTERED THUNDERSTORMS WERE OCCURRING OVER SOUTHWEST LOWER MICHIGAN...BUT WERE NOT SEVERE AT THIS TIME. ONCE AGAIN...THE WATCH CONTINUES FOR SOUTH CENTRAL AND SOUTHWEST LOWER MICHIGAN...GENERALLY SOUTH OF A ST. JOHNS TO HOLLAND LINE UNTIL 900 PM. DUKESHERER
Special weather statement, Jul 21, 6:25 PM EDT, 1 hour 38 minutes before
MIZ043>046-050>052-056-057-220000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 625 PM EDT TUE JUL 21 1998 THE NATIONAL WEATHER SERVICE HAS CANCELLED THE SEVERE THUNDERSTORM WATCH FOR THE FOLLOWING COUNTIES: IN WEST CENTRAL LOWER MICHIGAN: MUSKEGON NEWAYGO OCEANA IN CENTRAL LOWER MICHIGAN: GRATIOT ISABELLA MECOSTA MONTCALM IN SOUTHWEST LOWER MICHIGAN: KENT OTTAWA THE WATCH HAS BEEN CANCELLED FOR PORTIONS OF WEST CENTRAL AND CENTRAL LOWER MICHIGAN...BUT REMAINS IN EFFECT GENERALLY SOUTH OF A ST. JOHNS TO HOLLAND LINE UNTIL 900 PM EDT. AT 625 PM EDT...GRAND RAPIDS DOPPLER RADAR INDICATED THE SEVERE THUNDERSTORMS THAT MOVED THROUGH MUCH OF SOUTHWEST LOWER MICHIGAN HAD RACED EAST TOWARD THE DETROIT METROPOLITAN AREA. SCATTERED THUNDERSTORMS WERE OCCURRING OVER SOUTHWEST LOWER MICHIGAN...BUT WERE NOT SEVERE AT THIS TIME. ONCE AGAIN...THE WATCH CONTINUES FOR SOUTH CENTRAL AND SOUTHWEST LOWER MICHIGAN...GENERALLY SOUTH OF A ST. JOHNS TO HOLLAND LINE UNTIL 900 PM. DUKESHERER
Local storm report, Jul 21, 7:04 PM EDT, 59 minutes before
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</html>Local storm report, Jul 21, 7:04 PM EDT, 59 minutes before
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<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
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<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">
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<p id="message2">
Please try again in a few minutes.
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Severe Thunderstorm Warnings in Michigan, 1998Every severe thunderstorm warning in 1998
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.