Alert archive / Michigan / Winter Storm Watches in 2012
Winter Storm Watch 5, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this winter storm watch at Dec 18, 2012, 3:40 PM EST for 12 counties in Michigan. It took effect at Dec 20, 2012, 1:00 PM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 18, 2012, 3:40 PM EST (20:40 UTC)
- In effect from
- Dec 20, 2012, 1:00 PM EST
- Expired
- Dec 19, 2012, 2:57 PM EST
- In force
- Issued by
- NWS Grand Rapids, MI
Counties Allegan County, MI, Clare County, MI, Isabella County, MI, Lake County, MI, Mason County, MI, Mecosta 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), 65 km from the middle of the area, began a volume at 20:39 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 12:00Z, 8.7 hours before the alert went out and 218 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1095 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm watch 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 watch went out at Dec 18, 3:36 PM EST, 4 minutes earlier.
Area forecast discussion, Dec 18, 3:36 PM EST, 4 minutes before
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</html>Hazardous weather outlook, Dec 18, 5:51 AM EST, 9 hours 49 minutes before
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Winter Storm Watches in Michigan, 2012Every winter storm watch in 2012
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.