Alert archive / California / Tornado Warnings in 2017

Tornado Warning 1, NWS Sacramento, CA

March 21, 2017Stanislaus County, California

NWS Sacramento, CA issued this tornado warning at Mar 21, 2017, 12:48 PM PDT for Stanislaus County, California. It was in force for 27 min. 1 report 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, 2017, 12:48 PM PDT (19:48 UTC)
Expired: Mar 21, 2017, 1:15 PM PDT
In force: 27 min
Issued by: NWS Sacramento, CA
Area: Storm-based polygon

County Stanislaus County, CA

The radar

The San Francisco radar (KMUX), 98 km from the middle of the area, began a volume at 19:47 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, 1:10 PM PDT	FUNNEL CLOUD	3 Wnw Denair, CA	TRAINED SPOTTER REPORTED 2 BRIEF FUNNEL CLOUDS NORTH OF TURLOCK. NO TOUCHDOWN REPORTED.

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 12:00Z, 7.8 hours before the alert went out and 119 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: 22 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

216 
WFUS56 KSTO 211948
TORSTO
CAC099-212015-
/O.NEW.KSTO.TO.W.0001.170321T1948Z-170321T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sacramento CA
1248 PM PDT TUE MAR 21 2017

The National Weather Service in Sacramento has issued a

* Tornado Warning for...
  Central Stanislaus County in central California...

* Until 115 PM PDT
    
* At 1247 PM PDT, Doppler radar indicated a severe thunderstorm
  capable of producing a tornado. This dangerous storm was located 
  near Turlock, and moving northeast at 20 mph. Abundant hail is 
  also likely with this storm.

* Locations impacted include...
  Turlock, Denair and Keyes. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3749 12102 3762 12082 3753 12067 3750 12072
      3741 12095 3741 12096
TIME...MOT...LOC 1947Z 216DEG 45KT 3749 12088 

$$

cs

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 21, 10:26 AM PDT	Special Weather Statement	STO	Sacramento	34 min
Mar 21, 11:01 AM PDT	Special Weather Statement	STO	Yuba	44 min
Mar 21, 11:25 AM PDT	Special Weather Statement	STO	Sacramento, San Joaquin	35 min
Mar 21, 12:05 PM PDT	Special Weather Statement	STO	Amador, Nevada, Placer, Sacramento, San Joaquin	40 min
Mar 21, 12:27 PM PDT	Areal Flood Advisory	STO	Amador, Calaveras, El Dorado, Sacramento, San Joaquin, Stanislaus	3 hr
Mar 21, 12:33 PM PDT	Special Weather Statement	STO	Stanislaus	27 min
Mar 21, 1:15 PM PDT	Tornado Warning	STO	Stanislaus	32 min
Mar 21, 1:50 PM PDT	Severe Thunderstorm Warning	STO	Stanislaus, Tuolumne	40 min
Mar 21, 2:29 PM PDT	Severe Thunderstorm Warning	STO	Tuolumne	61 min

Nearby

Tornado Warnings in California, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.