Flash Flood Warning 8, NWS Sacramento, CA

000 
WGUS76 KSTO 042253
FFSSTO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
352 PM PDT TUE APR 4 2006

CAC067-042256-
SACRAMENTO CA-
352 PM PDT TUE APR 4 2006

...THE FLASH FLOOD WARNING FOR A LEVEE FAILURE IN SOUTHERN 
SACRAMENTO COUNTY IS CANCELLED...

THE LEVEE BREAK ON THE COSUMNES RIVER WEST OF HIGHWAY 99 IS NO 
LONGER POSING A FLASH FLOOD THREAT. WATER WILL CONTINUE TO FLOW 
THROUGH THE BREAK UNTIL WATER LEVELS ON THE CONSUMNES RIVER RECEDE.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3841 12137 3824 12129 3827 12148 3841 12142

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
930 AM PDT TUE APR 4 2006

.DISCUSSION...
AN ACTIVE DAY TODAY WITH A HEALTHY DOSE OF WINTER...FLOOD...AND
CONVECTIVE WEATHER TO BE DEALT WITH.  THE EASIEST...WINTER
WX...CONSISTS OF ONGOING HEAVY SNOWFALL IN THE HIGHER ELEVATIONS OF
THE SIERNEV RANGE WITH SNOW LEVELS FINALLY BEGINNING TO DROP.  AT
4500 TO 5000 FEET THIS MORNING NORTH OF I-80 AND NEAR 6000 FEET
NORTH OF YOSEMITE...THE LEVELS SHOULD DROP TO THE 3500 TO 4000 FOOT
RANGE BY WEDNESDAY MORNING.  WITH HEAVY PRECIP STILL FALLING IN
WAVES ACRS THE AREA UP TO ANOTHER HALF FOOT ABOVE 5000 FEET AND
POSSIBLY ANOTHER FOOT AT THE HIER ELEVATIONS IS POSSIBLE BY
WEDNESDAY MORNING.

WHICH LEADS US TO THE ISSUE OF HEAVY PRECIP/FLOODING.  A COUPLE
INCHES OF PRECIP...ON AVERAGE...HAS FALLEN ACRS INTERIOR NORCAL IN
THE PAST TWO DAYS OVER SOILS ALREADY WET FROM OUR MOIST MARCH.
RIVERS AND LARGER STREAMS COULD POSSIBLY HAVE HANDLED THE EXCESS IF
THE SNOW LEVELS WERE NOT AS HIGH AS THEY WERE...BUT THE HIGH SNOW
LEVELS RESULTED IN INCREASED RUNOFF INTO RESERVOIRS AND THEREFORE
INCREASED RELEASES NEEDED.  SO...FLOOD WARNINGS OUT ON THE MAINSTEM
SACRAMENTO AND SJ RIVERS AND SMALL RIVER AND STREAM FLOOD WARNINGS
OUT FOR THE EASTERN CENTRAL VALLEY AND ADJOINING FOOTHILLS.  WOULD
EXPECT THESE TO CONTINUE/BE EXTENDED INTO WEDNESDAY AT THE LEAST.

FINALLY...THE CONVECTIVE WX.  GUD CHC OF TSTMS ACRS INTERIOR NORCAL
LATE THIS MORNING AND WELL INTO THE AFTERNOON HOURS.  BEST CHC IS
FOCUSED IN THE SRN SAC...DELTA...AND NRN SJ VLY REGION AND INTO THE
MOTHERLODE.  DEPENDING UPON HOW THE LOW CENTER MOVES...WIND PROFILES
MAY SET UP SUCH THAT WE ARE SUSCEPTIBLE TO ROTATING UPDRAFTS AND
FUNNEL CLOUD SIGHTINGS WOULD BE EXPECTED.  BUT THAT PATTERN IS NOT
YET IN PLACE.  THE COLDER AIR ALOFT PUSHING IN IS INCREASING THE
TEMP GRAD AND IF IT STEEPENS MORE WE COULD BE IN ANOTHER ENVIRONMENT
FOR OODLES OF SMALL HAIL EVENTS.  IN GENERAL...WE ARE LUKG AT HEAVY
RAIN WITH ANYTHING THAT FORMS BUT ONLY MODERATELY STRONG WIND FLOW
OR DOWN DRAFTS.

BEYOND TODAY...THE PRECIP TAPERS OVERNIGHT TONIGHT AND OTHER THAN
CONTINUED HIGH FLOWS DUE TO RUNOFF WEDNESDAY SHUD BE A QUIETER DAY.
THURSDAY IS THE REAL BREAK IN THE ACTION AND A POSSIBLE CHC TO GET
THE LAWN MOWED FINALLY.  FRIDAY BRINGS THE NEXT SYSTEM INTO THE
REGION AND THE WEEKEND AND INTO NEXT WEEK CONTINUES THE OVERALL WET
PATTERN.

&&

.AVIATION...
PRIMARILY MVFR WX TODAY ACRS THE CNTRL VLY REGION WITH BANDS OF IFR
AS ENHANCED CELLS MOVE SW-NE THROUGH THE AREA.  ISOLD TSRA THROUGH
02Z IN MOST AREAS THOUGH BECMG SCT ACRS THE SRN SAC...DELTA...AND
NRN SJ VLYS BY AFTN.  IN/ACRS THE MTNS...SIERNEV ESPECIALLY S OF
I-80 AREAS 1/4SM RA FG AND SN ABV 050 AND MTNS OBSC...CSTL MTNS MVFR
WITH -RA BR AND LCL -TSRA.
&&

.STO WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WARNING IN EFFECT UNTIL 5 AM PDT WEDNESDAY FOR THE WEST
SLOPES OF THE NORTHERN SIERRA NEVADA.

SMALL RIVER AND STREAM FLOOD WARNING CONTINUES UNTIL 500 PM TUESDAY
FOR STANISLAUS...WESTERN PLACER...WESTERN EL DORADO...SACRAMENTO...
AMADOR...CALAVERAS...WESTERN TUOLUMNE AND SAN JOAQUIN COUNTIES.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SACRAMENTO CA
700 AM PDT TUE APR 4 2006

CAZ013>019-063-064-066>069-051400-
SHASTA LAKE AREA/NORTHERN SHASTA COUNTY-
BURNEY BASIN/EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY-
CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY-
CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY-
MOUNTAINS SOUTHWESTERN SHASTA TO NORTHERN LAKE COUNTIES-
CLEAR LAKE/SOUTHERN LAKE COUNTY-MOTHERLODE-
EAST FOOTHILLS/NORTH SACRAMENTO VALLEY-
WESTERN PLUMAS COUNTY/LASSEN PARK-WEST SLOPE NORTHERN SIERRA NEVADA-
700 AM PDT TUE APR 4 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA.

.DAY ONE...TODAY
RAIN AND SNOW SHOWERS WILL CONTINUE TODAY WITH ANOTHER WAVE COMING
THROUGH NORTHERN CALIFORNIA FROM THE UPPER LOW OFF THE CALIFORNIA COAST.
ISOLATED THUNDERSTORMS ARE POSSIBLE THROUGH THIS EVENING IN THE
VALLEY AND FOOTHILLS. THE THUNDERSTORMS MAY CONTAIN HEAVY RAIN AND
SMALL HAIL WITH POSSIBLE ACCUMULATIONS.   SNOW LEVELS AROUND 4000 TO
6000 FEET SHOULD LOWER TO AROUND 3500 TO 5000 FEET TONIGHT.
SATURATED GROUND AND RUNOFF ALONG WITH THE CONTINUED MODERATE TO
HEAVY RAIN WILL CAUSE RISES ON SMALL STREAMS AND CREEKS AND PONDING
OF WATER ON ROADWAYS AND POSSIBLY MUD AND ROCK DEBRIS SLIDES.

* FLOOD WARNING..............SEE WGUS46 KSTO - FLWSTO FOR DETAILS *

* RIVER FLOOD WARNING........SEE WGUS46 KSTO - FLWSTO FOR DETAILS *

* WINTER STORM WARNING.......SEE WWUS46 KSTO - WSWSTO FOR DETAILS *

.DAYS TWO THROUGH SEVEN... WEDNESDAY THROUGH MONDAY

THE SHOWERS SHOULD TAPER OFF TOMORROW BUT MAIN STEM RIVERS ARE STILL
EXPECTED TO BE HIGH. THURSDAY SHOULD BE A BRIEF DRY BREAK BEFORE
ANOTHER SYSTEM BRINGS MORE PRECIPITATION THURSDAY NIGHT THROUGH
MONDAY.

* RIVER FLOOD WARNING........SEE WGUS46 KSTO - FLWSTO FOR DETAILS *

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS TO THEIR LOCAL NATIONAL WEATHER SERVICE OFFICE.

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

HS