Alert archive / Michigan / Winter Weather Advisories in 2009

Winter Weather Advisory 21, NWS Grand Rapids, MI

December 26, 200923 counties in Michigan

NWS Grand Rapids, MI issued this winter weather advisory at Dec 26, 2009, 12:54 AM EST for 23 counties in Michigan. It took effect at Dec 26, 2009, 1:00 AM EST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Dec 26, 2009, 12:54 AM EST (05:54 UTC)
In effect from: Dec 26, 2009, 1:00 AM EST
Expired: Dec 26, 2009, 11:00 AM EST
In force: 10 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 05:55 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 5.9 hours before the alert went out and 266 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: 457 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 200 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 weather advisory 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 weather advisory went out at Dec 26, 12:15 AM EST, 39 minutes earlier.

Area forecast discussion, Dec 26, 12:15 AM EST, 39 minutes before

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Hazardous weather outlook, Dec 25, 8:20 PM EST, 4 hours 34 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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
Dec 26, 3:31 AM EST	Small Craft Advisory	GRR		21 hr
Dec 26, 3:48 PM EST	Winter Weather Advisory	GRR	Mason, Muskegon, Oceana, Ottawa	2 hr
Dec 26, 6:08 PM EST	Winter Storm Warning	GRR	Mason, Muskegon, Oceana, Ottawa	17 hr
Dec 26, 6:08 PM EST	Winter Weather Advisory	GRR	Allegan, Barry, Clare, Ionia, Isabella, Kalamazoo and 7 more	17 hr

Nearby

Winter Weather Advisories in Michigan, 2009 Every winter weather advisory 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.