California, 2018

Tornado and High Wind in California, February 12, 2018

February 12, 2018 · NWS HNX · 2 events in 2 counties and zones

High pressure brought a prolonged period of unseasonably warm temperatures to begin February as temperatures were 10 degrees or more above seasonal normals across much of the are for the first 10 days of the month. A low pressure system dropping into the Great Basin on the 10th brought a period of increased winds to the Kern County Mountains and Deserts during the late morning and early…

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS HNX wrote it up.

High pressure brought a prolonged period of unseasonably warm temperatures to begin February as temperatures were 10 degrees or more above seasonal normals across much of the are for the first 10 days of the month. A low pressure system dropping into the Great Basin on the 10th brought a period of increased winds to the Kern County Mountains and Deserts during the late morning and early afternoon as strong mid level winds mixed down to the surface where there were numerous reports of gusts between 45 and 50 mph. Another trough pushed through the Great Basin on the evening of the 11th through the morning of the 12th which pushed a cold front through Central California and brought another period of increased winds to the area and there were several reports of wind gusts between 50 and 55 mp in the Kern County Mountains and Deserts. this system also brought some light precipitation to the area with amounts generally less than a tenth of an inch of liquid precipitation in post-frontal showers on the 12th. A weak tornado briefly touched down in rural farmland near Sanger during the late morning of the 12th.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Feb 11, 2:07 PM PST, 12 hours 3 minutes earlier.

Area forecast discussion, Feb 11, 2:07 PM PST, 12 hours 3 minutes before
Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
207 PM PST Sun Feb 11 2018

.SYNOPSIS...
An area of low pressure will move south into Central California
tonight and Monday. With moisture lacking, the low pressure system
will bring the threat of light precipitation over the Sierra and
Kern County Mountains with very little if any rain in the San
Joaquin Valley.

&&

.DISCUSSION...
A low pressure system near the Oregon/California border this
afternoon will continue to drop south. The cold front associated
with this system will drop to near the Merced and Yosemite area
late this afternoon then continue to move south through the CWA
this evening and out of our area by about midnight. Models
continue to be in good agreement in keeping the area of low
pressure over central California on Monday, then drifting it
westward to a position near Point Conception by late Tuesday
afternoon before moving it east across southern California on
Wednesday.

This system is does not have a lot of moisture with it and the
trajectory favors precipitation over the mountains, but not the
San Joaquin Valley. Some light precipitation is expected to move
into the Sierra near Yosemite this evening as the front moves
through, then spread as far south as about Kings Canyon overnight.
This same area is favored for a chance of rain and snow showers
again on Monday. Snow levels are expected to lower to 3500 to 4000
feet tonight in the Sierra and remain near that level much of
Monday, however, precipitation amounts will be light, generally
one-tenth of an inch or less most places in the Sierra. The San
Joaquin Valley will see clouds, but generally only a sprinkle or
very light shower with no measurable rain expected.

The precipitation chances will spread into the Kern County
Mountains by Monday afternoon. Snow levels will lower to 3500 to
4000 feet early Tuesday morning, so cannot rule out a dusting of
snow over the Grapevine and Tehachapi Pass depending on how much
shower activity occurs. As of now, taking a wait and see position
on any headlines for potential low elevation snow due to the high
uncertainty of precipitation distribution.

The chance of precipitation decreases by Tuesday evening as the
low moves toward the coast. The trajectory of the low as it moves
east on Wednesday will determine if there will be any shower
activity in the Kern County Mountains. At this time have left in a
slight chance of showers in that are due to the uncertainty.

As this first low pressure system exits the area, another impulse
drops south east of the Sierra on Thursday. Models have not been
in good agreement on the placement of this feature, but most
indicate it will stay far enough east to keep any precipitation
out of the Sierra. A northwesterly flow with dry weather and
gradually warming temperatures will remain over the region Friday
through next weekend as the upper ridge remains over the eastern
Pacific.

&&

.AVIATION...
Mountain obscurations due to snow showers possible over the Sierra
Nevada after 03Z Monday, mainly north of Kings Canyon NP. Gusty
onshore winds to 35 kts 03z-15z Monday through and below mountain
passes of the Kern county mountains and desert. Otherwise, VFR
conditions will prevail elsewhere in the central CA interior during
the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Sunday February 11 2018... Fireplace/Wood Stove Burning Status
is: No Burning Unless Registered in Fresno... Kern... Kings and
Tulare Counties.
Further information is available at Valleyair.org

&&

.CERTAINTY...

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

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...
NONE.
&&

public...Bean
avn/fw...MV
synopsis...Bean

weather.gov/hanford

The radar

The San Joaquin Valley radar (KHNX), 41 km away, was scanning. The volume nearest the first event began at 19:30 UTC.

Open the radar archive at this moment

Event by event

1 high wind, 1 tornado. Local standard time, as filed.

High Wind, Tulare Cty Mtns

When
February 12, 2:10 AM PST
Where
Tulare Cty Mtns forecast zone
Measured
54 kt (62 mph) measured gust
Reported by
RAWS

The Bear Peak RAWS on an exposed ridge top reported a peak wind gust of 62 mph.

Tornado, Fresno

When
February 12, 11:30 AM PST to 11:32 AM PST
Where
Fresno County, 3.37 mi N of Parlier to 3.23 mi W of Reedley Airport
Rating
EF0
Path length
0.3 mi
Path width
20 yd
Reported by
Broadcast Media
Coordinates
36.669, -119.513

A tornado briefly touched down in rural farmland between Riverbend Ave. and Goodfellow Ave. southeast of Sanger and was captured on video and relayed to the NWS by a media source.

What these are

High Wind
Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.
Tornado
A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in California in 2018Every state in 2018This day in weather historyThe tornado archive for California, 2018Warnings in California, February 2018

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 730963, 731511.