Alert archive / Michigan / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 72, NWS Grand Rapids, MI

October 1, 2019Montcalm County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Oct 1, 2019, 10:44 PM EDT for Montcalm County, Michigan. It was in force for 40 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
Oct 1, 2019, 10:44 PM EDT (02:44 UTC)
Expired
Oct 1, 2019, 11:24 PM EDT
In force
40 min
Issued by
NWS Grand Rapids, MI
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

County Montcalm County, MI

The radar

The Grand Rapids radar (KGRR), 56 km from the middle of the area, began a volume at 02:43 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, 2.7 hours before the alert went out and 155 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-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 2019-10-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 151 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 00:00Z on 2019-10-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 204 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
151 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
1069 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
204 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 1, 9:04 PM EDTAreal Flood AdvisoryGRRClare, Isabella, Lake, Mason, Mecosta, Newaygo and 2 more37 hr
Oct 1, 10:13 PM EDTSpecial Weather StatementGRRMecosta, Montcalm, Newaygo62 min
Oct 1, 11:52 PM EDTAreal Flood AdvisoryGRRClinton, Gratiot, Ionia, Kent, Montcalm, Muskegon and 1 more15 hr
Oct 2, 12:30 AM EDTSpecial Marine WarningGRR60 min
Oct 2, 6:41 AM EDTRiver Flood WarningGRRNewaygo29 hr
Oct 2, 10:00 AM EDTRiver Flood WarningGRRMuskegon3 days
Oct 2, 10:00 AM EDTRiver Flood WarningGRRNewaygo29 hr
Oct 2, 10:00 AM EDTRiver Flood WarningGRRNewaygo3 days
Oct 2, 3:04 PM EDTRiver Flood WarningGRRClinton5 days
Oct 2, 3:31 PM EDTSmall Craft AdvisoryGRR40 hr

Nearby

Severe Thunderstorm Warnings in Michigan, 2019Every severe thunderstorm warning in 2019

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.