Alert archive / California / Tornado Warnings in 2018

Tornado Warning 2, NWS Sacramento, CA

March 15, 2018Tehama County, California

NWS Sacramento, CA issued this tornado warning at Mar 15, 2018, 6:29 PM PDT for Tehama County, California. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 15, 2018, 6:29 PM PDT (01:29 UTC)
Expired: Mar 15, 2018, 7:00 PM PDT
In force: 31 min
Issued by: NWS Sacramento, CA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Tehama County, CA

The radar

The Beale AFB radar (KBBX), 83 km from the middle of the area, began a volume at 01:29 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

Medford/Jackson, OR (KMFR), launched 00:00Z, 1.5 hours before the alert went out and 256 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: 6 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1036 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

746 
WFUS56 KSTO 160129
TORSTO
CAC103-160200-
/O.NEW.KSTO.TO.W.0002.180316T0129Z-180316T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sacramento CA
629 PM PDT THU MAR 15 2018

The National Weather Service in Sacramento has issued a

* Tornado Warning for...
  Central Tehama County in northern California...

* Until 700 PM PDT
    
* At 628 PM PDT, a severe thunderstorm capable of producing a tornado
  was located near Gerber-Las Flores, or near Red Bluff, moving east
  at 15 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  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. 

* This tornadic thunderstorm will remain over mainly rural areas of
  central Tehama County east of Red Bluff.

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.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Sacramento.

&&

LAT...LON 4008 12219 4013 12221 4019 12214 4012 12208
TIME...MOT...LOC 0128Z 262DEG 15KT 4012 12217 

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

$$

rb

1 follow-up statement

426 
WWUS56 KSTO 160154
SVSSTO

Severe Weather Statement
National Weather Service Sacramento CA
654 PM PDT THU MAR 15 2018

CAC103-160204-
/O.EXP.KSTO.TO.W.0002.000000T0000Z-180316T0200Z/
Tehama CA-
654 PM PDT THU MAR 15 2018

...THE TORNADO WARNING FOR CENTRAL TEHAMA COUNTY WILL EXPIRE AT 700
PM PDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However small hail and heavy rain are still
possible with this thunderstorm.

LAT...LON 4008 12219 4013 12221 4019 12214 4012 12208
TIME...MOT...LOC 0154Z 262DEG 15KT 4013 12205 

$$

rb

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 15, 6:08 PM PDT	Special Weather Statement	STO	Tehama	22 min
Mar 16, 2:40 PM PDT	Special Weather Statement	STO	Placer	35 min
Mar 16, 3:06 PM PDT	Special Weather Statement	STO	Tehama	39 min
Mar 16, 3:34 PM PDT	Special Weather Statement	STO	Yuba	41 min
Mar 16, 4:50 PM PDT	Special Weather Statement	STO	Tehama	40 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.