Alert archive / Washington / Winter Storm Watches in 2012
Winter Storm Watch 1, NWS Seattle, WA
NWS Seattle, WA issued this winter storm watch at Jan 16, 2012, 4:22 AM PST for San Juan County, Washington. It took effect at Jan 18, 2012, 12:00 AM PST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Jan 16, 2012, 4:22 AM PST (12:22 UTC)
- In effect from
- Jan 18, 2012, 12:00 AM PST
- Expired
- Jan 17, 2012, 3:35 PM PST
- In force
- Issued by
- NWS Seattle, WA
County San Juan County, WA
The radar
The Seattle radar (KATX), 54 km from the middle of the area, began a volume at 12:21 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
Salem/Mcnary, OR (KSLE), launched 12:00Z, 0.4 hours before the alert went out and 402 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
- 6 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 614 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 162 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 Seattle, WA wrote its last area forecast discussion before this winter storm watch went out at Jan 16, 4:00 AM PST, 22 minutes earlier.
Area forecast discussion, Jan 16, 4:00 AM PST, 22 minutes before
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Special weather statement, Jan 15, 10:32 PM PST, 5 hours 50 minutes before
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</html>The office that day
Everything else NWS Seattle, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 16, 2:39 AM PST | Small Craft Advisory | SEW | 3 days | |
| Jan 16, 2:39 AM PST | Small Craft Advisory for Hazardous Seas | SEW | 7 hr | |
| Jan 16, 4:22 AM PST | Winter Storm Warning | SEW | San Juan | 59 hr |
| Jan 16, 4:22 AM PST | Winter Weather Advisory | SEW | 6 hr | |
| Jan 16, 10:17 AM PST | Winter Storm Watch | SEW | 10 hr | |
| Jan 16, 10:17 AM PST | Winter Weather Advisory | SEW | San Juan | 29 hr |
Nearby
Winter Storm Watches in Washington, 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.