Greenfield spin-up Classified as an EF0 Tornado
A weak non-supercell EF0 tornado occurred Friday April 22, 2016 at around 4 pm associated with a line of showers along the leading edge of a cold front. Due to its non-supercell status, it will be referred to as a landspout, but is in the family of tornados.
Friday evening, 22 April, the Monterey WFO WCM was informed by a local TV meteorologist of a video posted to facebook showing a possible tornado or dust devil. The video was posted by and on the KRKC, Greenfield radio station, facebook page. Through the course of the evening of the 22nd and morning of the 23rd, the MTR WCM and WFO staff continued investigation through following up with the reporting TV meteorologist and reaching out to KRKC via facebook and email. By Saturday morning the 23rd the address and point of contact at the storm location was obtained and a storm survey was initiated.
The WFO MTR WCM was dispatched Saturday morning to perform a storm survey. The storm survey was done through the use of the Damage Assessment Toolkit (DAT) on the office iPad. Interviews were also conducted of eyewitnesses as part of the survey.
The visual survey was done with the help of an eyewitness who described where the landspout began, the path it took, damage it inflicted, and provided the visual confirmation of rotation. According to multiple accounts, the landspout began on the hillside NW of a small farm community, laying nearly flat a broad oak tree. As the landspout moved down the hill it likely went through a period of vortex stretching, allowing it to tighten up and spin a bit faster. Eyewitnesses say the landspout moved down off the hill and toward several small houses. It displaced two normal sized steel dumpsters about 30 yards in the direction of its travel. Along this flat land portion of the path the landspout encountered two oak trees, tearing off several large branches (3in diameter) and depositing them 20-30 yards away in a downpath direction. Damage assessment indicates the landspout weakened significantly while passing over several small housing structures and brushing by a barn. Once past these structures it encountered another downhill slope and re-intensified. The landspout then encountered a pole barn with a small to moderate size trailer parked beneath. There were no visible signs of damage to the trailer, but the pole barn showed significant roof damage. It is estimated that about half of the roof from the pole barn was damaged or torn off with this debris strewn about the area. Rotation is easily confirmed due to debris locations. Parts of the roof were thrown orthogonally to the right of the direction of movement, as far as 40 to 50 yards. Other portions of the roof were lifted up, taken with the landspout and scattered across a neighboring vineyard. The farthest deposit away from the pole barn is estimated at about 60 to 80 yards, along the landspout path to the southeast. Eyewitness video posted on KRKC facebook page shows the landspout at the far edge of the vineyard and entering a rapid dissipation phase.
Eyewitness accounts also included the following:
���	No significant winds outside of the landspout
���	Ears popping as the landspout passed
���	A palette spinning in the air in the landspout���s early phase
o	No palette was found and no damage from the palette was reported
���	Thunder was heard in the area preceding the landspout
���	Brief intense heavy rain followed the landspout
���	One person reported two distinct circulations; one that descended from the cloud base and another that followed which spun up off the ground
Atmospheric and observation conditions included:
���	Occurred along the leading edge of a passing cold front
���	Cloud bases were estimated from eyewitness video to be around 5kft
���	Radar showed showers in the area
���	Lowest angle of radar beam was at about 9-10kft over the area
���	Appears to be a case of low topped convection which is normal for the immediate west coast
���	Wind data in the area did not show significant speeds.

Tornado in MONTEREY, CALIFORNIA
From 22-APR-16 16:00:00 to 22-APR-16 16:01:00 (PST-8)
Location: PARAISO SPGS
Tornado F-scale: EF0
Reported by: Social Media

A weak non-supercell EF0 tornado occurred Friday April 22, 2016 at around 4 pm associated with a line of showers along the leading edge of a cold front. Due to its non-supercell status, it will be referred to as a landspout, but is in the family of tornados.
Friday evening, 22 April, the Monterey WFO WCM was informed by a local TV meteorologist of a video posted to facebook showing a possible tornado or dust devil. The video was posted by and on the KRKC, Greenfield radio station, facebook page. Through the course of the evening of the 22nd and morning of the 23rd, the MTR WCM and WFO staff continued investigation through following up with the reporting TV meteorologist and reaching out to KRKC via facebook and email. By Saturday morning the 23rd the address and point of contact at the storm location was obtained and a storm survey was initiated.
The WFO MTR WCM was dispatched Saturday morning to perform a storm survey. The storm survey was done through the use of the Damage Assessment Toolkit (DAT) on the office iPad. Interviews were also conducted of eyewitnesses as part of the survey.
The visual survey was done with the help of an eyewitness who described where the landspout began, the path it took, damage it inflicted, and provided the visual confirmation of rotation. According to multiple accounts, the landspout began on the hillside NW of a small farm community, laying nearly flat a broad oak tree. As the landspout moved down the hill it likely went through a period of vortex stretching, allowing it to tighten up and spin a bit faster. Eyewitnesses say the landspout moved down off the hill and toward several small houses. It displaced two normal sized steel dumpsters about 30 yards in the direction of its travel. Along this flat land portion of the path the landspout encountered two oak trees, tearing off several large branches (3in diameter) and depositing them 20-30 yards away in a downpath direction. Damage assessment indicates the landspout weakened significantly while passing over several small housing structures and brushing by a barn. Once past these structures it encountered another downhill slope and re-intensified. The landspout then encountered a pole barn with a small to moderate size trailer parked beneath. There were no visible signs of damage to the trailer, but the pole barn showed significant roof damage. It is estimated that about half of the roof from the pole barn was damaged or torn off with this debris strewn about the area. Rotation is easily confirmed due to debris locations. Parts of the roof were thrown orthogonally to the right of the direction of movement, as far as 40 to 50 yards. Other portions of the roof were lifted up, taken with the landspout and scattered across a neighboring vineyard. The farthest deposit away from the pole barn is estimated at about 60 to 80 yards, along the landspout path to the southeast. Eyewitness video posted on KRKC facebook page shows the landspout at the far edge of the vineyard and entering a rapid dissipation phase.
Eyewitness accounts also included the following:.
No significant winds outside of the landspout.
Ears popping as the landspout passed.
A palette spinning in the air in the landspout���s early phase.
No palette was found and no damage from the palette was reported.
Thunder was heard in the area preceding the landspout.
Brief intense heavy rain followed the landspout.
One person reported two distinct circulations; one that descended from the cloud base and another that followed which spun up off the ground.
Atmospheric and observation conditions included:.
Occurred along the leading edge of a passing cold front.
Cloud bases were estimated from eyewitness video to be around 5kft.
Radar showed showers in the area.
Lowest angle of radar beam was at about 9-10kft over the area.
Appears to be a case of low topped convection which is normal for the immediate west coast.
Wind data in the area did not show significant speeds.