Alert archive / Michigan / Winter Storm Warnings in 2009

Winter Storm Warning 5, NWS Grand Rapids, MI

February 20, 200923 counties in Michigan

NWS Grand Rapids, MI issued this winter storm warning at Feb 20, 2009, 3:43 PM EST for 23 counties in Michigan. It took effect at Feb 21, 2009, 4:00 AM EST. It was in force for 15 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 20, 2009, 3:43 PM EST (20:43 UTC)
In effect from: Feb 21, 2009, 4:00 AM EST
Expired: Feb 21, 2009, 7:00 PM EST
In force: 15 hr
Issued by: NWS Grand Rapids, MI

All 23 counties

Allegan County, MI, Barry County, MI, Calhoun County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Mason County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 27 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 680 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm 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 winter storm warning went out at Feb 20, 1:25 PM EST, 2 hours 18 minutes earlier.

Area forecast discussion, Feb 20, 1:25 PM EST, 2 hours 18 minutes before

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Hazardous weather outlook, Feb 20, 12:10 PM EST, 3 hours 33 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 3:08 PM EST	Areal Flood Warning	GRR	Mecosta	70 hr
Feb 20, 3:43 PM EST	Winter Weather Advisory	GRR	Lake, Mason, Oceana	12 hr

Nearby

Winter Storm Warnings in Michigan, 2009 Every winter storm warning in 2009

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.