Alert archive / Michigan / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 89, NWS Grand Rapids, MI

June 26, 1998Calhoun County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 26, 1998, 6:34 AM EDT for Calhoun County, Michigan. It was in force for 61 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: Jun 26, 1998, 6:34 AM EDT (10:34 UTC)
Expired: Jun 26, 1998, 7:35 AM EDT
In force: 61 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 10:36 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 nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 10.6 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1482 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1969 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

570 
WUUS1 KGRR 261036 RRA
SVRGRR
MIC025-261135-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
634 AM EDT FRI JUN 26 1998

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTH CENTRAL LOWER MICHIGAN

* UNTIL 735 AM EDT

* AT 632 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM 9 MILES SOUTH OF BATTLE CREEK OR 6 MILES
  NORTHWEST OF BURLINGTON MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BURLINGTON           AROUND 635 AM EDT
  TEKONSHA             AROUND 640 AM EDT
  MARSHALL             AROUND 645 AM EDT
  ALBION               AROUND 700 AM EDT

DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

MWH/TEW

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 Jun 25, 11:43 AM EDT, 18 hours 51 minutes earlier.

Area forecast discussion, Jun 25, 11:43 AM EDT, 18 hours 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1143 AM EDT WED JUN 24 1998

PLENTY OF INSTABILITY ACROSS SOUTHERN LOWER ONCE AGAIN THIS AFTERNOON...
WITH TEMPERATURES AROUND 90 AND DEW POINTS IN THE LOWER 70S PUSHING
CAPE VALUES TOWARD 4000 J/KG.  14Z SURFACE MAP SHOWS WELL DEFINED
OUTFLOW BOUNDARY AND MESOHIGH DRAPED ACROSS CENTRAL LOWER MICHIGAN.
ACTUAL WARM FRONT APPEARS TO BE NORTH OF FORECAST AREA...SO WILL
LOOK TO CONVECTIVE BOUNDARIES AND POSSIBLE LAND/LAKE INTERACTION TO
FOCUS AFTERNOON THUNDERSTORM DEVELOPMENT.  LOW AND MID LEVEL WIND
MAXIMA PROGGED ACROSS SOUTHERN LOWER THIS AFTERNOON AS WELL...WITH
0-6KM SHEAR VALUES OF 30 M/S COMBINED WITH HIGH INSTABILITES AND A
STRONG MID LEVEL DRY PUNCH ENHANCING SEVERE WEATHER POTENTIAL. 12Z
DTX SOUNDING DID SHOW A MID LEVEL CAPPING INVERSION...WHICH SHOULD
BE OVERCOME BY HEATING AND UPPER SUPPORT PROVIDED BY VORTICITY MAX
EXPECTED TO MOVE INTO NORTHERN LOWER THIS EVEbNING. ONLY REAL CHANGE
TO FORECAST WILL BE TO REMOVE MORNING REFERENCES AND ADJUST THE WINDS
A BIT.

BORIS

In the hours before

Special weather statement, Jun 26, 2:49 AM EDT, 3 hours 45 minutes before

MIZ037>040-043>046-050>052-056>059-064>067-071>074-260800-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
249 AM EDT FRI JUN 26 1998

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS CLEARED PORTIONS OF
SEVERE THUNDERSTORM WATCH 671 FOR PARTS OF SOUTHWEST LOWER MICHIGAN.
THE FOLLOWING COUNTIES HAVE BEEN CLEARED FROM THE WATCH:

IN WEST CENTRAL LOWER MICHIGAN:
LAKE               MASON              MUSKEGON
NEWAYGO            OCEANA

IN CENTRAL LOWER MICHIGAN:
CLARE              GRATIOT            ISABELLA
MECOSTA            MONTCALM           OSCEOLA

IN SOUTHWEST LOWER MICHIGAN:
ALLEGAN            BARRY              KALAMAZOO
KENT               OTTAWA             VAN BUREN

IN SOUTH CENTRAL LOWER MICHIGAN:
CALHOUN            CLINTON            EATON
INGHAM             IONIA              JACKSON

SOME WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE FOR THE
REMAINDER OF THE NIGHT. ANY STORMS THAT DO DEPVELOP SHOULD REMAIN BELOW
SEVERE LEVELS.

MWH

Special weather statement, Jun 26, 2:49 AM EDT, 3 hours 45 minutes before

MIZ037>040-043>046-050>052-056>059-064>067-071>074-260800-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
249 AM EDT FRI JUN 26 1998

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS CLEARED PORTIONS OF
SEVERE THUNDERSTORM WATCH 671 FOR PARTS OF SOUTHWEST LOWER MICHIGAN.
THE FOLLOWING COUNTIES HAVE BEEN CLEARED FROM THE WATCH:

IN WEST CENTRAL LOWER MICHIGAN:
LAKE               MASON              MUSKEGON
NEWAYGO            OCEANA

IN CENTRAL LOWER MICHIGAN:
CLARE              GRATIOT            ISABELLA
MECOSTA            MONTCALM           OSCEOLA

IN SOUTHWEST LOWER MICHIGAN:
ALLEGAN            BARRY              KALAMAZOO
KENT               OTTAWA             VAN BUREN

IN SOUTH CENTRAL LOWER MICHIGAN:
CALHOUN            CLINTON            EATON
INGHAM             IONIA              JACKSON

SOME WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE FOR THE
REMAINDER OF THE NIGHT. ANY STORMS THAT DO DEPVELOP SHOULD REMAIN BELOW
SEVERE LEVELS.

MWH

Special weather statement, Jun 26, 5:52 AM EDT, 42 minutes before

MIZ037>040-043>046-050>052-056>059-064>067-071>074-271200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
552 AM EDT FRI JUN 26 1998

...SEVERE WEATHER POTENTIAL STATEMENT FOR THE SOUTHWEST QUARTER OF
LOWER MICHIGAN...

DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS AS NEEDED.

...DISCUSSION...
HOT HUMID CONDITIONS... A NEARLY STATIONARY FRONTAL BOUNDARY ACROSS
SOUTHERN LOWER MICHIGAN AND ANOTHER IN A SERIES OF UPPER LEVEL
SYSTEMS WILL BE THE FOCUSING MECHANISM FOR SEVERE WEATHER TODAY
THROUGH EARLY SATURDAY.  THE BEST CHANCE FOR SEVERE THUNDERSTORMS
WILL BE BETWEEN 4 PM AND 10 PM EDT.  WARM TEMPERATURES AND HIGH
LEVELS OF HUMIDITY WILL BE EXPERIENCED OVER THE NEXT 24 HOURS.

...POTENTIAL HAZARDS AND FORECAST THUNDERSTORM MOVEMENT...
THE MAIN SEVERE WEATHER THREAT WILL BE WINDS IN THE 60 T0 70 MPH
RANGE AND HAIL FROM 3/4 TO 11/2 INCHES.  STORMS WILL MOVE FROM THE
WEST AT 30 TO 40 MPH. THE HIGH MOISTURE CONTENT IN THE AIR AND THE
STATIONARY NATURE OF THE FRONTAL SYSTEM ACROSS LOWER MICHIGAN ALSO
PROVIDE SOME OF THE INGREDIENTS NEEDED TO PRODUCED LOCALIZED URBAN
AND SMALL STREAM FLOODING.

...SPOTTER ACTIVATION...
SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT FOR WEST
AND CENTRAL LOWER MICHIGAN.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL TELEVISION...RADIO OR CABLE
TELEVISION STATIONS FOR THE LATEST WEATHER INFORMATION CONCERNING THE
SEVERE WEATHER THREAT ACROSS THE SOUTHWEST QUARTER OF LOWER MICHIGAN.

MWH

Special weather statement, Jun 26, 5:52 AM EDT, 42 minutes before

MIZ037>040-043>046-050>052-056>059-064>067-071>074-271200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
552 AM EDT FRI JUN 26 1998

...SEVERE WEATHER POTENTIAL STATEMENT FOR THE SOUTHWEST QUARTER OF
LOWER MICHIGAN...

DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS AS NEEDED.

...DISCUSSION...
HOT HUMID CONDITIONS... A NEARLY STATIONARY FRONTAL BOUNDARY ACROSS
SOUTHERN LOWER MICHIGAN AND ANOTHER IN A SERIES OF UPPER LEVEL
SYSTEMS WILL BE THE FOCUSING MECHANISM FOR SEVERE WEATHER TODAY
THROUGH EARLY SATURDAY.  THE BEST CHANCE FOR SEVERE THUNDERSTORMS
WILL BE BETWEEN 4 PM AND 10 PM EDT.  WARM TEMPERATURES AND HIGH
LEVELS OF HUMIDITY WILL BE EXPERIENCED OVER THE NEXT 24 HOURS.

...POTENTIAL HAZARDS AND FORECAST THUNDERSTORM MOVEMENT...
THE MAIN SEVERE WEATHER THREAT WILL BE WINDS IN THE 60 T0 70 MPH
RANGE AND HAIL FROM 3/4 TO 11/2 INCHES.  STORMS WILL MOVE FROM THE
WEST AT 30 TO 40 MPH. THE HIGH MOISTURE CONTENT IN THE AIR AND THE
STATIONARY NATURE OF THE FRONTAL SYSTEM ACROSS LOWER MICHIGAN ALSO
PROVIDE SOME OF THE INGREDIENTS NEEDED TO PRODUCED LOCALIZED URBAN
AND SMALL STREAM FLOODING.

...SPOTTER ACTIVATION...
SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT FOR WEST
AND CENTRAL LOWER MICHIGAN.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL TELEVISION...RADIO OR CABLE
TELEVISION STATIONS FOR THE LATEST WEATHER INFORMATION CONCERNING THE
SEVERE WEATHER THREAT ACROSS THE SOUTHWEST QUARTER OF LOWER MICHIGAN.

MWH

The office that day

Everything else NWS Grand Rapids, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 8:30 PM EDT	Severe Thunderstorm Warning	GRR	Barry	50 min
Jun 25, 8:55 PM EDT	Severe Thunderstorm Warning	GRR	Eaton	65 min
Jun 25, 9:16 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot	79 min
Jun 25, 9:23 PM EDT	Severe Thunderstorm Warning	GRR	Mason	62 min
Jun 25, 9:25 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	65 min
Jun 25, 9:58 PM EDT	Severe Thunderstorm Warning	GRR	Eaton	47 min
Jun 25, 10:22 PM EDT	Severe Thunderstorm Warning	GRR	Oceana	48 min
Jun 25, 10:34 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	31 min
Jun 25, 10:55 PM EDT	Severe Thunderstorm Warning	GRR	Lake	60 min
Jun 25, 11:01 PM EDT	Severe Thunderstorm Warning	GRR	Newaygo	34 min
Jun 25, 11:47 PM EDT	Severe Thunderstorm Warning	GRR	Van Buren	48 min
Jun 26, 12:08 AM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry	62 min
Jun 26, 12:39 AM EDT	Severe Thunderstorm Warning	GRR	Kalamazoo	66 min
Jun 26, 1:06 AM EDT	Severe Thunderstorm Warning	GRR	Calhoun	64 min
Jun 26, 1:34 AM EDT	Severe Thunderstorm Warning	GRR	Eaton	51 min
Jun 26, 3:58 AM EDT	Severe Thunderstorm Warning	GRR	Van Buren	62 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1998 Every 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.