Alert archive / California / Winter Storm Watches in 2012
Winter Storm Watch 10, NWS Reno, NV
NWS Reno, NV issued this winter storm watch at Dec 18, 2012, 2:44 PM PST for Douglas County, Washoe County, Nevada; 8 counties in California. It took effect at Dec 21, 2012, 4:00 AM PST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 18, 2012, 2:44 PM PST (22:44 UTC)
- In effect from
- Dec 21, 2012, 4:00 AM PST
- Expired
- Dec 20, 2012, 3:41 AM PST
- In force
- Issued by
- NWS Reno, NV
Counties Alpine County, CA, El Dorado County, CA, Lassen County, CA, Mono County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA, Douglas County, NV, Washoe County, NV
The radar
The Reno radar (KRGX), 77 km from the middle of the area, began a volume at 22:46 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
Medford/Jackson, OR (KMFR), launched 12:00Z, 10.7 hours before the alert went out and 401 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
- 501 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 93 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 Reno, NV wrote its last area forecast discussion before this winter storm watch went out at Dec 18, 9:46 AM PST, 4 hours 58 minutes earlier.
Area forecast discussion, Dec 18, 9:46 AM PST, 4 hours 58 minutes before
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Local storm report, Dec 18, 11:20 AM PST, 3 hours 24 minutes before
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Winter Storm Watches in California, 2012Winter Storm Watches in Nevada, 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.