Alert archive / California / Tornado Warnings in 2018

Tornado Warning 3, NWS Sacramento, CA

March 21, 2018Yuba County, California

NWS Sacramento, CA issued this tornado warning at Mar 21, 2018, 6:31 PM PDT for Yuba County, California. It was in force for 29 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 21, 2018, 6:31 PM PDT (01:31 UTC)
Expired: Mar 21, 2018, 7:00 PM PDT
In force: 29 min
Issued by: NWS Sacramento, CA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Yuba County, CA

The radar

The Beale AFB radar (KBBX), 48 km from the middle of the area, began a volume at 01:32 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.

What was reported inside it

Time	Report	Where	Remark
Mar 21, 6:34 PM PDT	TORNADO 0	2 Ene Arboga, CA	UPDATED TO ADD MAGNITUDE BASED ON REPORTS FROM LAW ENFORCEMENT AND EYE WITNESS REPORTS
Mar 21, 6:34 PM PDT	TORNADO	2 Ene Arboga, CA	TORNADO ON THE GROUD MOVING NORTHEAST.
Mar 21, 6:42 PM PDT	TORNADO 0	3 Se Arboga, CA	TORNADO TOUCH DOWN OBSERVED BY YUBA COUNTY DEPUTIES AT TOYOTA AMPHITHEATER IN WHEATLAND. MINOR DAMAGE OBSERVED, INCLUDING RIPPED TARPS AND OBJECTS KNOCKED OVER. UPDATED TO ADD MAGNITUDE BASED ON REPORTS FROM LAW ENFORCEMENT AND EYE WITNESS REPORTS
Mar 21, 6:42 PM PDT	TORNADO	3 Se Arboga, CA	TORNADO TOUCH DOWN OBSERVED BY YUBA COUNTY DEPUTIES AT TOYOTA AMPHITHEATER IN WHEATLAND. MINOR DAMAGE OBSERVED, INCLUDING RIPPED TARPS AND OBJECTS KNOCKED OVER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Oakland, CA (KOAK), launched 00:00Z, 1.5 hours before the alert went out and 162 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 38 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 972 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

206 
WFUS56 KSTO 220131
TORSTO
CAC115-220200-
/O.NEW.KSTO.TO.W.0003.180322T0131Z-180322T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sacramento CA
631 PM PDT WED MAR 21 2018

The National Weather Service in Sacramento has issued a

* Tornado Warning for...
  Southwestern Yuba County in central California...

* Until 700 PM PDT

* At 631 PM PDT, a severe thunderstorm capable of producing a tornado
  was located over Arboga, or 8 miles southeast of Marysville, moving
  north at 20 mph.

  HAZARD...Tornado. 

  SOURCE...Weather spotters reported funnel cloud. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* Locations impacted include...
  Marysville, Olivehurst and Linda. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

&&

LAT...LON 3900 12148 3901 12155 3920 12156 3918 12138
TIME...MOT...LOC 0131Z 189DEG 19KT 3904 12152 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

HEC

2 follow-up statements

998 
WWUS56 KSTO 220139
SVSSTO

Severe Weather Statement
National Weather Service Sacramento CA
639 PM PDT WED MAR 21 2018

CAC115-220200-
/O.CON.KSTO.TO.W.0003.000000T0000Z-180322T0200Z/
Yuba CA-
639 PM PDT WED MAR 21 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM PDT FOR
SOUTHWESTERN YUBA COUNTY...
    
At 638 PM PDT, a confirmed tornado was located just east of 
Olivehurst, or near Marysville, moving north at 20 mph.

HAZARD...Damaging tornado. 

SOURCE...Public confirmed tornado. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations impacted include...
Marysville, Olivehurst and Linda. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to an
interior room on the lowest floor of a sturdy building. Avoid
windows. If you are outdoors, in a mobile home, or in a vehicle, move
to the closest substantial shelter and protect yourself from flying
debris.

&&

LAT...LON 3907 12147 3908 12155 3920 12156 3918 12138
TIME...MOT...LOC 0138Z 189DEG 19KT 3908 12151 

TORNADO...OBSERVED
HAIL...<.75IN

$$

HEC

240 
WWUS56 KSTO 220156
SVSSTO

Severe Weather Statement
National Weather Service Sacramento CA
656 PM PDT WED MAR 21 2018

CAC115-220206-
/O.EXP.KSTO.TO.W.0003.000000T0000Z-180322T0200Z/
Yuba CA-
656 PM PDT WED MAR 21 2018

...THE TORNADO WARNING FOR SOUTHWESTERN YUBA COUNTY WILL EXPIRE AT
700 PM PDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

LAT...LON 3907 12147 3908 12155 3920 12156 3918 12138
TIME...MOT...LOC 0156Z 189DEG 19KT 3917 12149 

$$

HEC

The office that day

Everything else NWS Sacramento, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 21, 5:44 PM PDT	Special Weather Statement	STO	Yuba	46 min
Mar 21, 9:37 PM PDT	River Flood Warning	STO	Amador, El Dorado, Sacramento	34 hr
Mar 21, 9:44 PM PDT	Special Weather Statement	STO	Shasta	46 min
Mar 22, 7:28 AM PDT	Special Weather Statement	STO	Placer	62 min
Mar 22, 8:02 AM PDT	Areal Flood Advisory	STO	Amador, El Dorado, Nevada, Placer, Sacramento, San Joaquin	3 hr
Mar 22, 8:47 AM PDT	Flash Flood Watch	STO		14 hr
Mar 22, 10:18 AM PDT	Areal Flood Advisory	STO	Amador, Calaveras, El Dorado, Sacramento, San Joaquin	3 hr
Mar 22, 10:59 AM PDT	Areal Flood Advisory	STO	Stanislaus, Tuolumne	3 hr
Mar 22, 11:15 AM PDT	Areal Flood Advisory	STO	Amador, Butte, Calaveras, El Dorado, Nevada, Placer and 5 more	6 hr
Mar 22, 1:13 PM PDT	Special Weather Statement	STO	San Joaquin	32 min
Mar 22, 2:05 PM PDT	Special Weather Statement	STO	Amador	25 min
Mar 22, 2:22 PM PDT	Special Weather Statement	STO	Amador, Calaveras, El Dorado	38 min
Mar 22, 2:24 PM PDT	Flash Flood Warning	STO	Tuolumne	24 hr
Mar 22, 2:55 PM PDT	Special Weather Statement	STO	Calaveras	35 min
Mar 22, 3:47 PM PDT	Special Weather Statement	STO	Nevada	43 min
Mar 22, 4:59 PM PDT	Areal Flood Warning	STO	Tuolumne	6 hr

Nearby

Tornado Warnings in California, 2018 Every tornado warning in 2018 Tornadoes in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.