Alert archive / California / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 19, NWS Sacramento, CA

September 19, 2004San Joaquin County, California

NWS Sacramento, CA issued this severe thunderstorm warning at Sep 19, 2004, 5:05 PM PDT for San Joaquin County, California. It was in force for 40 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: Sep 19, 2004, 5:05 PM PDT (00:05 UTC)
Expired: Sep 19, 2004, 5:45 PM PDT
In force: 40 min
Issued by: NWS Sacramento, CA
Area: Counties, with a storm outline in the text

County San Joaquin County, CA

The radar

The Sacramento radar (KDAX), 72 km from the middle of the area, began a volume at 00:04 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 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 Sep 19, 3:30 PM PDT, 1 hour 35 minutes earlier.

Area forecast discussion, Sep 19, 3:30 PM PDT, 1 hour 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
330 PM PDT SUN SEP 19 2004

.DISCUSSION...CONVECTION INTENSIFIED IN THE SRN SAC VLY DURING THE
AFTN AS VORT MAX /COLD POOL ALOFT/ MOVED INTO THE BAY AREA/SRN SAC
VLY ALONG WITH NOSE OF UPPER LEVEL JET. STRONGEST CELLS PRODUCING
HAIL AND LOCALLY HEAVY RAIN DEVELOPED AND ARE MOVING ALONG A FRONTAL
BOUNDARY WHICH EXTENDS ROUGHLY FROM NEAR SUU-SAC-BLU WITH A MESO LOW
FOCUSING INFLOW OVER SAC. THIS IS DEPICTED BY LAPS SFC WIND FIELD.
CONVECTION LIKELY TO WEAKEN AT SUNSET...BUT ISSUED WSW FOR ZONE 69
AS CONVECTIVE CELLS MOVE INTO SIERNEV THIS EVENING. PCPN FALLING
INTO DRIER AIR MASS IN LOW LEVELS OVER SIERNEV ALSO LOWERED WBZS TO
NEAR 5000 FEET...AND CONVECTIVE CELLS THIS EVENING MAY ALSO CAUSE
SOME LOCALLY LOWER SNOW LEVELS. CONVECTION LIKELY TO DECREASE AS
VORT MAX MOVES OFF INTO NV AROUND MIDNIGHT...AND SUBSIDENCE AND
DRYING OCCUR IN WAKE OF VORT MAX BY MON MORNING. VISIBLE OUTFLOW
BOUNDARY FROM CONVECTION NEAR OVE EARLIER THIS AFTN IS MOVING WWD
ACROSS THE VALLEY. CONVERGENCE MUCH WEAKER AND CELLS ARE MUCH WEAKER
ON THE TAIL END OF THE VORT MAX.

SECONDARY VORT MAX SLIDING DOWN THE BACKSIDE OF THE UPPER TROF ON
MON FORECAST TO INCREASE SUBSIDENCE AND KICK UP NLY WINDS. ABOUT A 6
MBS NLY GRADIENT FROM MFR-SAC FORECAST FOR MON AFTN...WHICH MAY
CAUSE GUSTS TO 25 MPH IN THE VALLEY. OTHERWISE THE NLY FLOW WILL
GIVE A BOOST TO  MAX TEMPS IN AREAS FAVORED BY ADIABATIC WARMING.

WEAK RIDGING FORECAST TO BUILD INTO NORCAL BEHIND THIS DEEP TROF FOR
THE REST OF THE WEEK...ALTHOUGH THE GFS INDICATES A WEAK SHORT WAVE
WILL DENT THE RIDGE THU/FRI. OTHERWISE...TEMPS SHOULD REBOUND TO
NORMAL BY TUE AND CONTINUE THROUGH THE REST OF THE WEEK.   JHM

&&

.STO...STO WATCHES/WARNINGS/ADVISORIES...URBAN AND SMALL STREAM
       FLOOD ADVISORY FOR SACRAMENTO COUNTY UNTIL 6 PM.
    ...SNOW ADVISORY UNTIL 4 AM FOR THE WEST SLOPES OF THE
       NORTHERN SIERRA NEVADA.
&&

Hazardous weather outlook, Sep 19, 4:30 PM PDT, 35 minutes before

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Nearby

Severe Thunderstorm Warnings in California, 2004 Every severe thunderstorm warning in 2004

Sources

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