Alert archive / Michigan / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 76, NWS Grand Rapids, MI

June 25, 1998Mason County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 25, 1998, 9:23 PM EDT for Mason County, Michigan. It was in force for 62 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 25, 1998, 9:23 PM EDT (01:23 UTC)
Expired: Jun 25, 1998, 10:25 PM EDT
In force: 62 min
Issued by: NWS Grand Rapids, MI
Area: Whole counties

County Mason County, MI

The radar

The Grand Rapids radar (KGRR), 138 km from the middle of the area, began a volume at 01:24 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.

What was reported inside it

Time	Report	Where	Remark
Jun 25, 9:59 PM EDT	Thunderstorm Wind 63	Hamlin Lake, MI	Mason County law enforcement reported a 73-mph wind gust in the village of Hamlin Lake at 9:59 pm EDT. The Ludington Daily News reported large trees were uprooted and minor structural damage occurred in a narrow path between the south and middle bayous of Haml
Jun 25, 9:59 PM EDT	Thunderstorm Wind 61	Scottville, MI	A trained weather spotter in Scottville reported a 70 mph wind gust as measured by his local anemometer. Trees and power lines were downed by severe thunderstorm winds in and around the city.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 1.4 hours before the alert went out and 146 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: 2137 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1195 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 12.5

Open this sounding in Storm Lab

The text

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

866 
WUUS1 KGRR 260124 RRA
SVRGRR
MIC105-260225-

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

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MASON COUNTY IN WEST CENTRAL LOWER MICHIGAN

* UNTIL 1025 PM EDT

* AT 922 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM IN THE VICINITY OF LUDINGTON MOVING NORTHEAST
  AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SCOTTVILLE           AROUND 930 PM EDT
  FOUNTAIN             AROUND 945 PM EDT
  FREESOIL             AROUND 945 PM EDT

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

GTG

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, 9 hours 40 minutes earlier.

Area forecast discussion, Jun 25, 11:43 AM EDT, 9 hours 40 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, 9:25 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
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.