Severe Thunderstorm Warning 23, NWS Sacramento, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
955 AM PDT TUE JUL 29 2003

STRONG HIGH PRESSURE CURRENTLY OVER NORTHERN CA WILL KEEP
TEMPERATURES WELL ABOVE NORMAL FOR MOST AREAS TODAY.  850 TEMPS FROM
MORNING UPPER AIR AND ARB SOUNDINGS SHOWED 5000 FEET TEMPS UP 1 TO 5
DEGREES F HIGHER THEN 24 HOURS AGO.  WEAK ENERGY MOVING UNDER THE
UPPER HIGH FROM EAST TO WEST IS EXPECTED TO MOVE INTO THE BAY AREA
THIS AFTERNOON.  THIS MAY BE A FACTOR FOR THE LATE AFTERNOON HIGHS
FOR THE DELTA AND ADJACENT COASTAL VALLEYS.  MARINE LAYER HAS RISEN
TO 1700 FEET AT FORT ORD AND ONSHORE GRADIENT IS NOW AROUND 2.5 MB
BETWEEN SFO AND SAC WITH WEAK UP VALLEY GRADIENT.  WILL MONITOR
SITUATION FOR POSSIBLE UPDATES. MOISTURE INCREASES TONIGHT AT THE
MID AND UPPER LEVELS ALONG THE COASTAL RANGE LATE TONIGHT.  HOWEVER
THE NORTHERN VALLEY AND NORTHERN FOOTHILLS ARE NOT LIKELY TO SEE
THUNDERSTORMS TONIGHT BASED ON FORECAST SOUNDINGS.  THEREFORE HAVE
REMOVED POPS NORTH OF SACRAMENTO AND OVER THE NORTHERN FOOTHILLS FOR
THE TONIGHT PERIOD. LAM

.STO...NONE.

CAZ013>019-063-064-066>069-301400-

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE SACRAMENTO CA
700 AM PDT TUE JUL 29 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA.

.DAY ONE...TODAY

A CHANCE OF THUNDERSTORMS ARE FORECAST FOR THIS AFTERNOON  AND
EVENING IN THE SIERRA...WITH A SLIGHT CHANCE OF THUNDERSTORMS FOR
THE NORTHERN SAN JOAQUIN VALLEY AND DELTA INTO THE MOTHERLODE BY
THIS AFTERNOON.  ISOLATED THUNDERSTORMS WILL MOVE THROUGH MUCH OF
THE REGION THIS EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

MORE SCATTERED THUNDERSTORMS ARE FORECAST IN THE MOUNTAINS THROUGH
FRIDAY WITH ISOLATED THUNDERSTORMS POSSIBLE IN THE VALLEY. A DRYING
TREND IS EXPECTED FOR THIS WEEKEND IN THE VALLEY...AND ONLY ISOLATED
THUNDERSTORMS FORECAST FOR THE MOUNTAINS. BY MONDAY THE STORMS WILL
BE OUT OF THE SIERRA WITH ISOLATED THUNDERSTORMS FORECAST FOR THE
SOUTHERN CASCADES.

THE LATEST WEATHER INFORMATION IS AVAILABLE ON THE INTERNET
AT (LOWER CASE): HTTP://WWW.WRH.NOAA.GOV/SACRAMENTO

RCH

CAZ017-019-301330-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
200 PM TUE JUL 29 2003

...RECORD TIED FOR NUMBER OF DAYS AT OR ABOVE 100 DEGREES IN A
MONTH...

WHEN THE TEMPERATURE HIT 100 DEGREES TODAY AT 1:50 PM PDT...THE
RECORD FOR DAYS AT OR ABOVE 100 DEGREES IN ONE MONTH WAS TIED IN
SACRAMENTO. WE HAVE HAD 17 DAYS AT OR ABOVE 100 DEGREES SO FAR THIS
MONTH. WE HAD 7  CONSECUTIVE DAYS OVER 100 DEGREES FROM JULY 16
THROUGH JULY 22. THE AVERAGE HIGH THIS MONTH SO FAR IS 98.2...AND
THE AVERAGE TEMPERATURE SO FAR THIS MONTH IS 81.5. THE NORMAL
AVERAGE TEMPERATURE FOR JULY IS 76.9 DEGREES. THE AVERAGE NUMBER OF
DAYS WITH TEMPERATURES AT OR ABOVE 100 DEGREES FOR JULY IS 7 DAYS.

THE DOWNTOWN SACRAMENTO RECORD OF 17 DAYS AT OR ABOVE 100 DEGREES
WAS PREVIOUSLY SET IN JULY 1988...WHICH IS THE HOTTEST MONTH ON
RECORD. THE AVERAGE HIGH TEMPERATURE THAT MONTH WAS 99.6...AND THE
AVERAGE TEMPERATURE THAT MONTH WAS 81.6 DEGREES...WHICH LOOKS TO BE
TIED THIS YEAR.

NOT ONLY HAVE DAYTIME HIGHS BEEN UNUSUALLY WARM...OVERNIGHT LOWS
HAVE BEEN ABOVE AVERAGE AS WELL. THE RECORD FOR WARMEST AVERAGE
OVERNIGHT MINIMUM TEMPERATURE IN JULY IS 64.1 DEGREES...AND THE
NORMAL IS 60.4. SO FAR THIS MONTH THE AVERAGE OVERNIGHT MINIMUM IS
64.7...POSSIBLY BREAKING THE RECORD.

JBS