Alert archive / Michigan / Special Weather Statements in 2023

Special Weather Statement, NWS Grand Rapids, MI

July 20, 2023Mason County, Oceana County, Michigan

NWS Grand Rapids, MI issued this special weather statement at Jul 20, 2023, 10:12 AM EDT for Mason County, Oceana County, Michigan. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2023, 10:12 AM EDT (14:12 UTC)
Expired: Jul 20, 2023, 11:15 AM EDT
In force: 63 min
Issued by: NWS Grand Rapids, MI
Hail: 0.75 in
Wind: 40

Counties Mason County, MI, Oceana County, MI

The radar

The Grand Rapids radar (KGRR), 129 km from the middle of the area, began a volume at 14:12 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 12:00Z, 2.2 hours before the alert went out and 270 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: 68 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1249 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 20, 7:45 AM EDT, 2 hours 27 minutes earlier.

Area forecast discussion, Jul 20, 7:45 AM EDT, 2 hours 27 minutes before

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Hazardous weather outlook, Jul 20, 4:29 AM EDT, 5 hours 43 minutes before

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In the hours before

Special weather statement, Jul 20, 10:12 AM EDT, 0 minutes before

Special Weather Statement
National Weather Service Grand Rapids MI
1012 AM EDT Thu Jul 20 2023

MIZ037-043-201515-
Oceana MI-Mason MI-
1012 AM EDT Thu Jul 20 2023

...Strong thunderstorms will impact portions of Mason and Oceana
Counties through 1115 AM EDT...

At 1011 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles west of Manistee to 16 miles northwest
of Silver Lake SP. Movement was east at 20 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Ludington...           Hart...                Shelby...
Scottville...          Hesperia...            Pentwater...
Fountain...            Free Soil...           Hamlin Lake...
Mears SP...            Ludington SP...        Silver Lake SP...
Weare...               Elbridge...            Colfax...
New Era...             Rothbury...            Custer...
Walkerville...         Mason County Airport...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4417 8604 4347 8604 4347 8646 4358 8653
      4366 8654 4380 8643 4393 8645 4394 8643
      4394 8646 4406 8651 4412 8643 4418 8639
TIME...MOT...LOC 1411Z 274DEG 17KT 4423 8647 4378 8681

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

NJJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 10:09 AM EDT	Special Marine Warning	GRR		66 min
Jul 20, 10:44 AM EDT	Special Marine Warning	GRR		61 min
Jul 20, 11:03 AM EDT	Special Weather Statement	GRR	Lake, Muskegon, Newaygo	87 min
Jul 20, 11:18 AM EDT	Special Weather Statement	GRR	Oceana	42 min
Jul 20, 11:30 AM EDT	Special Weather Statement	GRR	Osceola	90 min
Jul 20, 11:52 AM EDT	Special Weather Statement	GRR	Mecosta	98 min
Jul 20, 11:56 AM EDT	Severe Thunderstorm Warning	GRR	Osceola	49 min
Jul 20, 12:09 PM EDT	Severe Thunderstorm Warning	GRR	Mecosta, Montcalm, Newaygo	79 min
Jul 20, 12:18 PM EDT	Severe Thunderstorm Warning	GRR	Clare	57 min
Jul 20, 12:29 PM EDT	Severe Thunderstorm Warning	GRR	Isabella	75 min
Jul 20, 12:49 PM EDT	Severe Thunderstorm Warning	GRR	Montcalm	56 min
Jul 20, 1:08 PM EDT	Severe Thunderstorm Warning	GRR	Gratiot	67 min
Jul 20, 1:31 PM EDT	Severe Thunderstorm Warning	GRR	Ionia, Kent	44 min
Jul 20, 1:35 PM EDT	Severe Thunderstorm Warning	GRR	Clinton	40 min
Jul 20, 2:08 PM EDT	Severe Thunderstorm Warning	GRR	Eaton	52 min
Jul 20, 2:14 PM EDT	Severe Thunderstorm Warning	GRR	Clinton	31 min
Jul 20, 2:18 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	57 min
Jul 20, 2:48 PM EDT	Severe Thunderstorm Warning	GRR	Jackson	57 min

Nearby

Special Weather Statements in Michigan, 2023 Every special weather statement in 2023

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.