Alert archive / Michigan / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 38, NWS Grand Rapids, MI

June 20, 1997Osceola County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 20, 1997, 6:33 AM EDT for Osceola County, Michigan. It was in force for 32 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 20, 1997, 6:33 AM EDT (10:33 UTC)
Expired: Jun 20, 1997, 7:05 AM EDT
In force: 32 min
Issued by: NWS Grand Rapids, MI
Area: Whole counties

County Osceola County, MI

The radar

The NCL Michigan radar (KAPX), 113 km from the middle of the area, began a volume at 10:33 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 208 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: 405 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

601 
WUUS1 KGRR 201034 RRA
SVRGRR
MIC133-201105-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
633 AM EDT FRI JUN 20 1997

* SEVERE THUNDERSTORM WARNING FOR
  OSCEOLA COUNTY - CENTRAL LOWER MICHIGAN

* UNTIL 705 AM EDT
 
* SOME LOCATIONS AFFECTED
  EVART                AROUND 645 AM EDT
  INA                  AROUND 645 AM EDT
  MARION               AROUND 655 AM EDT

* AT 631 AM EDT...A SEVERE THUNDERSTORM WAS DETECTED BY NATIONAL
  WEATHER SERVICE DOPPLER RADAR 13 MILES NORTHWEST OF EVART OR 10
  MILES SOUTHWEST OF DIGHTON MOVING EAST AT 40 MPH.

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

TRH

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 19, 11:14 PM EDT, 7 hours 19 minutes earlier.

Area forecast discussion, Jun 19, 11:14 PM EDT, 7 hours 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1110 PM EDT THU JUN 19 1997

UPDATING ZONES TO GO WITH SCATTERED SHOWERS AND STORMS THROUGH THE NGHT
...AS WARM FRONT ALNG I-94 SLOWLY INCHING NORTH THROUGH THE NGHT.
PROXIMITY OF WARM FRONT AND POSSIBLE UPSTREAM MCS DEVELOPMENT IN WI/IL
ROLLING IN FROM THE WEST LATE DECIDED TO BROADBRUSH AND GO 50 POPS FOR
THE WHOLE AREA. LOWS TONIGHT WILL RANGE FROM THE LOW 60S NORTH TO THE
UPR 60S SOUTH.

RJD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:46 AM EDT	Severe Thunderstorm Warning	GRR	Mecosta, Montcalm	34 min
Jun 20, 9:16 AM EDT	Severe Thunderstorm Warning	GRR	Ionia	34 min
Jun 20, 10:25 AM EDT	Severe Thunderstorm Warning	GRR	Gratiot, Montcalm	35 min
Jun 20, 4:04 PM EDT	Severe Thunderstorm Warning	GRR	Ottawa	36 min
Jun 20, 4:19 PM EDT	Severe Thunderstorm Warning	GRR	Kent	51 min
Jun 20, 6:34 PM EDT	Severe Thunderstorm Warning	GRR	Ottawa	41 min
Jun 20, 7:23 PM EDT	Flash Flood Warning	GRR	Allegan, Ottawa	47 min
Jun 20, 7:23 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Ottawa	47 min
Jun 20, 7:39 PM EDT	Severe Thunderstorm Warning	GRR	Kent	46 min
Jun 20, 7:53 PM EDT	Severe Thunderstorm Warning	GRR	Barry	47 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1997 Every severe thunderstorm warning in 1997

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.