Alert archive / Michigan / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 83, NWS Grand Rapids, MI

June 25, 1998Van Buren County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 25, 1998, 11:47 PM EDT for Van Buren County, Michigan. It was in force for 48 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 25, 1998, 11:47 PM EDT (03:47 UTC)
Expired: Jun 26, 1998, 12:35 AM EDT
In force: 48 min
Issued by: NWS Grand Rapids, MI
Area: Whole counties

County Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 92 km from the middle of the area, began a volume at 03:49 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
Jun 25, 8:45 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 3.8 hours before the alert went out and 241 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.

577 
WUUS1 KGRR 260349 RRA
SVRGRR
MIC159-260435-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1147 PM EDT THU JUN 25 1998

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  VAN BUREN COUNTY IN SOUTHWESTERN LOWER MICHIGAN

* UNTIL 1235 AM EDT

* AT 1146 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM 21 MILES WEST OF SOUTH HAVEN MOVING EAST AT 50
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOUTH HAVEN          AROUND 1200 AM EDT
  COVERT               AROUND 1200 AM EDT
  MCDONALD             AROUND 1205 AM EDT
  BANGOR               AROUND 1210 AM EDT

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

RJD

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, 12 hours 4 minutes earlier.

Area forecast discussion, Jun 25, 11:43 AM EDT, 12 hours 4 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

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 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
Jun 26, 6:34 AM EDT	Severe Thunderstorm Warning	GRR	Calhoun	61 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.