Alert archive / California / Tornado Warnings in 2015

Tornado Warning 3, NWS Sacramento, CA

April 7, 2015Butte County, California

NWS Sacramento, CA issued this tornado warning at Apr 7, 2015, 4:00 PM PDT for Butte County, California. It was in force for 43 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: Apr 7, 2015, 4:00 PM PDT (23:00 UTC)
Expired: Apr 7, 2015, 4:43 PM PDT
In force: 43 min
Issued by: NWS Sacramento, CA
Area: Storm-based polygon

County Butte County, CA

The radar

The Beale AFB radar (KBBX), 15 km from the middle of the area, began a volume at 23:01 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

Oakland, CA (KOAK), launched 12:00Z, 11.0 hours before the alert went out and 214 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: 8 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

757 
WFUS56 KSTO 072300
TORSTO
CAC007-080000-
/O.NEW.KSTO.TO.W.0003.150407T2300Z-150408T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SACRAMENTO CA
400 PM PDT TUE APR 7 2015

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL BUTTE COUNTY IN NORTHERN CALIFORNIA...

* UNTIL 500 PM PDT

* AT 350 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  THERMALITO...OR 6 MILES WEST OF OROVILLE...MOVING NORTH AT 15 MPH.
  THIS THUNDERSTORM IS LIKELY PRODUCING ACCUMULATING HAIL.

* THE TORNADO WILL BE NEAR...
  RURAL CENTRAL BUTTE COUNTY AT 410 PM PDT. THIS STORM WILL PASS 
OVER HIGHWAY 99 IN THE NEXT 30 MINUTES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME OR OUTDOORS...
MOVE TO THE CLOSEST SUBSTANTIAL BUILDING.

IF IN A VEHICLE IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A
STURDY STRUCTURE. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR LOW SPOT AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3973 12180 3973 12157 3946 12158 3945 12179
TIME...MOT...LOC 2253Z 179DEG 13KT 3951 12168

$$

DANG

1 follow-up statement

783 
WWUS56 KSTO 072343 RRA
SVSSTO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
443 PM PDT TUE APR 7 2015

CAC007-072354-
/O.CAN.KSTO.TO.W.0003.000000T0000Z-150408T0000Z/
BUTTE CA-
443 PM PDT TUE APR 7 2015

...THE TORNADO WARNING FOR CENTRAL BUTTE COUNTY IS CANCELLED...

LAT...LON 3973 12180 3973 12157 3946 12158 3945 12179
TIME...MOT...LOC 2344Z 179DEG 13KT 3969 12168

$$

DANG

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 10:48 AM PDT	Special Weather Statement	STO	Solano	42 min
Apr 7, 12:07 PM PDT	Special Weather Statement	STO	San Joaquin	53 min
Apr 7, 12:58 PM PDT	Severe Thunderstorm Warning	STO	Amador, Calaveras, Sacramento, San Joaquin	58 min
Apr 7, 1:56 PM PDT	Special Weather Statement	STO	Glenn	64 min
Apr 7, 2:00 PM PDT	Severe Thunderstorm Warning	STO	Placer, Sacramento, Sutter, Yolo	26 min
Apr 7, 2:25 PM PDT	Severe Thunderstorm Warning	STO	El Dorado, Placer, Sacramento, Sutter, Yolo	65 min
Apr 7, 2:30 PM PDT	Severe Thunderstorm Warning	STO	Glenn, Tehama	45 min
Apr 7, 2:41 PM PDT	Special Weather Statement	STO	Stanislaus	64 min
Apr 7, 3:13 PM PDT	Tornado Warning	STO	Glenn	22 min
Apr 7, 3:25 PM PDT	Special Weather Statement	STO	Amador	50 min
Apr 7, 3:32 PM PDT	Special Weather Statement	STO	Yuba	58 min
Apr 7, 3:33 PM PDT	Special Weather Statement	STO	Calaveras	57 min
Apr 7, 3:54 PM PDT	Tornado Warning	STO	Butte	49 min
Apr 7, 4:29 PM PDT	Special Weather Statement	STO	Sacramento	46 min

Nearby

Tornado Warnings in California, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.