Alert archive / California / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 7, NWS Sacramento, CA

June 5, 2015Tuolumne County, California

NWS Sacramento, CA issued this severe thunderstorm warning at Jun 5, 2015, 3:27 PM PDT for Tuolumne County, California. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 5, 2015, 3:27 PM PDT (22:27 UTC)
Expired: Jun 5, 2015, 4:15 PM PDT
In force: 48 min
Issued by: NWS Sacramento, CA
Area: Storm-based polygon

County Tuolumne County, CA

The radar

The Sacramento radar (KDAX), 159 km from the middle of the area, began a volume at 22:27 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

Reno, NV (KREV), launched 12:00Z, 10.5 hours before the alert went out and 229 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1168 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sacramento, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 5, 9:11 AM PDT, 6 hours 16 minutes earlier.

Area forecast discussion, Jun 5, 9:11 AM PDT, 6 hours 16 minutes before

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In the hours before

Special weather statement, Jun 5, 2:38 PM PDT, 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
238 PM PDT FRI JUN 5 2015

CAZ067-069-052230-
MOTHERLODE CA-WEST SLOPE NORTHERN SIERRA NEVADA CA-
238 PM PDT FRI JUN 5 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL NEVADA AND NORTH
CENTRAL PLACER COUNTIES UNTIL 330 PM PDT...

AT 235 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
OVER BAXTER...MOVING WEST AT 10 MPH. THIS STORM IS OVER INTERSTATE
80 NEAR ALTA/DUTCH FLAT.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
BAXTER...COLFAX...SUGAR PINE...IOWA HILL AND ALTA SIERRA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3906 12079 3912 12104 3927 12083 3924 12069
TIME...MOT...LOC 2135Z 078DEG 5KT 3921 12082

CS

Special weather statement, Jun 5, 3:05 PM PDT, 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
305 PM PDT FRI JUN 5 2015

CAZ069-052300-
WEST SLOPE NORTHERN SIERRA NEVADA CA-
305 PM PDT FRI JUN 5 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN TUOLUMNE COUNTY
UNTIL 400 PM PDT...

AT 302 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 14
MILES NORTHWEST OF YOSEMITE NATIONAL...NEAR HETCH HETCHY...
MOVING WEST AT 10 MPH.

NICKEL SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEASTERN
TUOLUMNE COUNTY...EAST OF GROVELAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LOCALLY VERY HEAVY RAINFALL MAY OCCURR WITH THIS STORM. FREQUENT
CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING
CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER
INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3780 11987 3778 11986 3776 11988 3776 11994
      3781 12005 3789 12010 3804 12007 3802 11988
      3791 11989 3789 11988 3789 11983 3784 11983
TIME...MOT...LOC 2202Z 086DEG 7KT 3789 11981

JHM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 2:38 PM PDT	Special Weather Statement	STO	Placer	52 min
Jun 5, 3:05 PM PDT	Special Weather Statement	STO	Tuolumne	55 min
Jun 5, 4:48 PM PDT	Special Weather Statement	STO	El Dorado	42 min
Jun 5, 4:59 PM PDT	Severe Thunderstorm Warning	STO	El Dorado	46 min

Nearby

Severe Thunderstorm Warnings in California, 2015 Every severe thunderstorm warning 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.