Alert archive / California / Winter Storm Warnings in 2017

Winter Storm Warning 1, NWS Hanford, CA

December 31, 2016

NWS Hanford, CA issued this winter storm warning at Dec 31, 2016, 6:44 PM PST. It was in force for 5 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: Dec 31, 2016, 6:44 PM PST (02:44 UTC)
Expired: Jan 1, 2017, 12:00 AM PST
In force: 5 hr
Issued by: NWS Hanford, CA

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 Hanford, CA wrote its last area forecast discussion before this winter storm warning went out at Dec 31, 3:44 PM PST, 3 hours earlier.

Area forecast discussion, Dec 31, 3:44 PM PST, 3 hours before

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
344 PM PST Sat Dec 31 2016

.UPDATE...Updated air quality issues.

&&

.SYNOPSIS...
Low pressure center off the Central California coast will bring in
San Joaquin Valley rain and snow to the Kern county mountains
tonight. Unsettled weather will continue through Monday. Another
storm system is expected to reach the region by Wednesday and
remain unsettled through next Saturday.

&&

.DISCUSSION...
Tonight...Upper low off the central California coast is providing
plenty of lift across the SJV for moderate rain this afternoon.
The low center is tracking south into SOCAL this evening with
cold air moving in behind it. Snow levels are expected to drop
very quickly this evening across the Kern Co mountains. Snow
levels are expected to drop down to pass level as the upper low
pushes into SOCAL tonight. We currently have a Winter Weather
Advisory in effect for dangerous travel across the Grapevine and
the Tehachapi passes.

Sunday...Weak ridging behind the upper low center moving through
will quiet things down a bit. guidance is still trying to provide
some shower activity in the Sierra as NW flow aloft will provide
some upslope flow for clouds and a few showers Sunday afternoon
and evening. We may once again see some patchy fog development in
the SJV late Sunday night into Monday morning.

Monday and Tuesday...This is where things get difficult as far the
forecast goes. All of the guidance had previously been advertising
a very cold arctic low center dropping south out of Western
Canada into our region by Tuesday. There had been forecast
precipitation ahead of the front that was expected to drop south
into our area by Wednesday. Well, the guidance has backed off
that solution significantly and stalls the front to our North intoNRN
Ca.

Wednesday and Thursday...New guidance is bringing a weak wave
along the stalled arctic front to our north and clips our NRN CWA
Wednesday night. Again, this is huge change from the previous
forecast with not only chances of precipitation but also
temperature forecasts. At this point we are not going to totally
buy into this pattern change and will trend towards the new
solution. We have lowered pops a bit and warmed up temps a bit,
but not really buying into the guidance yet....since it such a
huge change.

Friday and Saturday...Deep closed low center over the Gulf of AK
slips south off the PAC NW coast as airmass modifies a bit. Upper
ridge over Baja in conjunction with the deep upper sets up an
Atmospheric River situation for potentially heavy precipitation
event starting Friday and continuing through Saturday or even
longer. With this pattern, warmer temperatures would also be
expected with high snow levels.

&&

.AVIATION...Precipitation spreading eastward over San Joaquin
Valley with areas of MVFR and local IFR conditions thru 12Z Sun. In
the Southern Sierra Nevada, areas of mountain obscuring IFR ceilings
in low clouds and precipitation thru around 12Z Sunday for areas
mainly north of Kern County. In Kern County, expect MVFR conditions
and showers, except IFR ceilings due to mountain obscurations
through 18Z Sun. In addition, isolated thunderstorms possible in
much of Kern County with gusty winds and heavy rain at times thru
06Z Sunday. Otherwise, VFR conditions are expected through the next
24 hours.

&&

.AIR QUALITY ISSUES...
None.

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is low.
The level of certainty for days 3 through 7 is low.

Certainty levels include low...medium...and high. Please visit
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
Winter Weather Advisory until midnight PST tonight CAZ095.

&&

public...JDB
avn/fw...BSO
synopsis...JDB

weather.gov/hanford

In the hours before

Local storm report, Dec 31, 3:52 PM PST, 2 hours 52 minutes before

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Local storm report, Dec 31, 4:22 PM PST, 2 hours 22 minutes before

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Local storm report, Dec 31, 4:46 PM PST, 1 hour 58 minutes before

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Local storm report, Dec 31, 5:27 PM PST, 1 hour 17 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
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Special weather statement, Dec 31, 5:51 PM PST, 53 minutes before

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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 Hanford, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 31, 5:39 PM PST	Areal Flood Advisory	HNX	Kern	3 hr
Dec 31, 5:51 PM PST	Special Weather Statement	HNX		24 min
Dec 31, 10:04 PM PST	Areal Flood Advisory	HNX	Kern	5 hr

Nearby

Winter Storm Warnings in California, 2017 Every winter storm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.