Flash Flood Warning 25, NWS Reno, NV

169 
WGUS75 KREV 260130
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
630 PM PDT MON AUG 25 2014

CAC017-260400-
/O.CON.KREV.FF.W.0025.000000T0000Z-140826T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EL DORADO CA-
630 PM PDT MON AUG 25 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM PDT FOR
NORTHEASTERN EL DORADO COUNTY...

AT 622 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH LAKE 
TAHOE...SOUTH LAKE TAHOE AIRPORT...HEAVENLY CREEK...TROUT 
CREEK...AND TAYLOR CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND 
UNDERPASSES. ABUNDANT SMALL HAIL WILL ALSO CAUSE SLICK CONDITIONS ON 
AREA ROADS IN SOUTH LAKE TAHOE...INCLUDING HIGHWAY 50 AND 89.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. A FEW INCHES OF FAST FLOWING WATER IS
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD.

&&

LAT...LON 3899 12000 3891 11988 3889 11987 3887 11987
      3881 11993 3893 12007

$$

HOON

478 
WGUS75 KREV 260240
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
740 PM PDT MON AUG 25 2014

CAC017-260250-
/O.CAN.KREV.FF.W.0025.000000T0000Z-140826T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EL DORADO CA-
740 PM PDT MON AUG 25 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN EL
DORADO COUNTY...

THE STORMS THAT EARLIER PROMPTED THE FLASH FLOOD WARNING HAVE
DISSIPATED...WITH A DIMINISHING FLOOD THREAT. REMEMBER THAT MINOR
FLOODING OF LOW SPOTS MAY CONTINUE FOR SEVERAL HOURS.

LAT...LON 3899 12000 3891 11988 3889 11987 3887 11987
      3881 11993 3893 12007

$$

HOON

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
159 PM PDT MON AUG 25 2014

.SYNOPSIS...
DRIER CONDITIONS RETURN TO EASTERN CALIFORNIA AND WESTERN NEVADA
ON TUESDAY AS LOW PRESSURE MOVES INTO EASTERN NEVADA. NEAR AVERAGE
TEMPERATURES WILL RISE TO ABOVE AVERAGE BY THURSDAY AS HIGH PRESSURE
STRENGTHENS OVERHEAD. HIGH PRESSURE WILL WEAKEN FOR THE WEEKEND
WITH INCREASING WINDS AND COOLING TEMPERATURES POSSIBLE.

&&

.SHORT TERM...
AN UPPER LOW IS CENTERED OVER NEAR THE NEVADA/OREGON BORDER WITH A
TROUGH AXIS EXTENDING INTO NORTHEAST CALIFORNIA AND WESTERN NEVADA.
DAYTIME HEATING AND THE TROUGH AXIS HAS CREATED A FOCUS FOR SHOWERS
AND ISOLATED THUNDERSTORMS THIS AFTERNOON, GENERALLY NEAR AND NORTH
OF INTERSTATE 80 SO FAR. AS THE TROUGH AXIS SLIDES SLOWLY SOUTH
INTO THE EVENING, EXPECT ISOLATED TO LOW-END SCATTERED THUNDERSTORMS
TO SPREAD SOUTH WITH THE TROUGH. FOR MOST OF THE REGION, THE
THUNDERSTORMS APPEAR RATHER RUN OF THE MILL WITH BRIEF HEAVY RAIN
AND CLOUD-TO-GROUND LIGHTNING. HOWEVER, THE STORM PREDICTION
CENTER'S MESOSCALE ANALYSIS INDICATES SOME UNIDIRECTIONAL SHEAR
(AROUND 35 KTS) OVER CHURCHILL AND PERSHING COUNTIES AHEAD OF THE
TROUGH AXIS. THIS COULD LEAD TO STRONGER AND MORE LONG-LIVED
THUNDERSTORMS OUT IN THE BASIN AND RANGE INTO THIS EVENING IF ANY
THUNDERSTORMS DEVELOP (CONVECTION STRUGGLING OUT THERE RIGHT NOW).

TUESDAY AND WEDNESDAY, EASTERN CALIFORNIA AND WESTERN NEVADA DRIES
OUT AS THE UPPER LOW EXITS INTO EASTERN NEVADA AND UTAH AND AN
UPPER RIDGE BUILDS IN FROM THE PACIFIC. WITH NORTHERLY FLOW ALOFT,
TEMPERATURES WILL REMAIN MODERATED SOMEWHAT WITH HIGHS REMAINING
AROUND AVERAGE BEFORE HEATING UP LATE WEEK AS THE RIDGE BUILDS
OVERHEAD. SNYDER

.LONG TERM...THURSDAY THROUGH MONDAY...
NO SIGNIFICANT CHANGES WERE MADE TO THE FORECAST THIS AFTERNOON.
MAIN FORECAST STRUGGLE CONTINUES TO BE THE DISAGREEMENT BETWEEN HOW
THE MODELS HANDLE REMNANTS OF MARIE. OVERALL, CONFIDENCE REMAINS
SOMEWHAT LOW FOR SATURDAY AND SUNDAY AS MODELS DO NOT HANDLE
TROPICAL REMNANTS WELL.

THE 12Z GFS HAS FOILED OUR FORECAST PLANS ONCE AGAIN. THE 0Z LOOKED
MORE LIKE THE PREVIOUS ECMWF WITH KEEPING THE TROPICAL REMNANTS
FARTHER WEST, BUT THE CURRENT 12Z GFS BRINGS TROPICAL MOISTURE
ACROSS NORTHERN CALIFORNIA AND SOUTHERN OREGON AGAIN. THE 12Z ECMWF
FORTUNATELY HAS STUCK WITH ITS PREVIOUS SOLUTION WITH KEEPING THE
MOISTURE WELL WEST OF THE COAST. EVEN IF THE GFS SOLUTION PANS OUT,
THE CHANCES FOR PRECIPITATION, IF ANY OCCURS, WILL BE RIGHT ALONG
THE CALIFORNIA/OREGON BORDER. KEPT SHOWERS OUT OF THE FORECAST FOR
SATURDAY AFTERNOON/EVENING AND ONLY INCREASED CLOUD COVER ACROSS THE
NORTHERN PORTION OF THE FORECAST AREA.

FORECAST MODELS KEEP THE MAIN TROUGH DYNAMICS AND COLD POOL NORTH OF
THE AREA THROUGH THE WEEKEND FOR NOW, BUT IF IT DIGS FURTHER SOUTH
THEN PRECIPITATION CHANCES COULD CHANGE. GFS/ECMWF DIFFER ON THE
TROUGH ORIENTATION AND STRENGTH OF THE UPPER LEVEL JET FOR THE
WEEKEND. THE GFS DISPLAYS MORE OF A WEST-EAST ORIENTATION OF THE JET
WHILE THE ECMWF SHOWS A NW/SE ORIENTATION. BOTH SOLUTIONS WOULD
RESULT IN FAIRLY BREEZY CONDITIONS FOR AREAS NORTH OF INTERSTATE 80,
BUT PREDICTABILITY OF PRECIPITATION CHANCES AT THIS POINT WILL BE
FAIRLY LOW.

TEMPERATURES SHOULD CLIMB ABOVE AVERAGE AS THE RIDGE HOLDS ON
THURSDAY...THEN WILL MODERATE SLIGHTLY THROUGH THE WEEKEND AS CLOUD
COVER INCREASES THROUGH THE WEEKEND. ELW

&&

.AVIATION...
OVERALL VFR CONDITIONS EXPECTED TONIGHT. A SYSTEM DROPPING SOUTH
THIS AFTERNOON MAY PRODUCE A FEW THUNDERSTORMS...MAINLY OVER THE
BASIN AND RANGE. CEILINGS COULD BRIEFLY DROP BELOW 5K FT...BUT THE
PRIMARY THREAT WILL BE GUSTY OUTFLOW WINDS NEAR THE SURFACE ALONG
WITH TURBULENCE AND POSSIBLY SOME SMALL HAIL.

WEST WINDS ARE FORECAST TO INCREASE THROUGH THIS EVENING WITH GUSTS
APPROACHING 20-25 KTS IN SOME AREAS. WINDS WILL SHIFT TO THE NORTH
AND NORTHEAST AND DECREASE THIS EVENING AND OVERNIGHT. LIGHT WINDS
CONTINUE FOR TUESDAY...EXCEPT EARLY MORNING EASTERLY WINDS COULD BE
GUSTY OVER THE SIERRA. 20/ELW

&&

.REV WATCHES/WARNINGS/ADVISORIES...
NV...NONE.
CA...NONE.
&&

FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/RENO (ALL LOWER CASE)

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RENO NV
503 PM PDT MON AUG 25 2014

CAZ072-260100-
GREATER LAKE TAHOE AREA-
503 PM PDT MON AUG 25 2014

...STRONG THUNDERSTORM NEAR LUTHER PASS...

AT 500 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM 5 MILES NORTHWEST OF WOODFORDS...OR 9 MILES
SOUTHEAST OF SOUTH LAKE TAHOE...AND MOVING EAST AT 5 MPH.

OCCASIONAL LIGHTNING...MODERATE RAIN...SMALL PEA SIZE HAIL...AND
STRONG GUSTY WINDS TO 50 MPH...WILL OCCUR WITH THIS STORM.

* LOCATIONS AFFECTED THROUGH 600 PM PDT INCLUDE...GROVER HOT
  SPRINGS...HOPE VALLEY...INDIAN CREEK RESERVOIR...MARKLEEVILLE...
  PAYNESVILLE AND WOODFORDS.

HEAVY RAINFALL IS OCCURRING WITH THIS STORM. EXPECT PONDING OF WATER
ON ROADWAYS. IN AREAS OF STEEP TERRAIN...MINOR ROCK SLIDES ARE
POSSIBLE. DRIVERS SHOULD SLOW DOWN AND TURN ON THEIR HEADLIGHTS IF
ENCOUNTERING HEAVY RAINS.

&&

LAT...LON 3886 12010 3897 11997 3873 11961 3864 11977
TIME...MOT...LOC 0003Z 265DEG 5KT 3883 11987

HOON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RENO NV
538 PM PDT MON AUG 25 2014

CAZ072-NVZ002-260115-
GREATER LAKE TAHOE AREA-
538 PM PDT MON AUG 25 2014

...STRONG THUNDERSTORM NOW OVER SOUTH LAKE TAHOE...

AT 534 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM 4 MILES SOUTHEAST OF SOUTH LAKE TAHOE...AND
MOVING SOUTHEAST AT 5 MPH.

OCCASIONAL LIGHTNING...MODERATE TO HEAVY RAIN WITH AMOUNTS UP TO ONE
INCH PER HOUR...SMALL PEA SIZE HAIL...AND GUSTY WINDS TO 40
MPH...MAY OCCUR WITH THIS STORM.

* LOCATIONS AFFECTED THROUGH 615 PM PDT INCLUDE...STATELINE...SOUTH
  LAKE TAHOE AND SOUTH LAKE TAHOE AIRPORT.

HEAVY RAINFALL IS OCCURRING WITH THIS STORM. EXPECT PONDING OF WATER
ON ROADWAYS. IN AREAS OF STEEP TERRAIN...MINOR ROCK SLIDES ARE
POSSIBLE. DRIVERS SHOULD SLOW DOWN AND TURN ON THEIR HEADLIGHTS IF
ENCOUNTERING HEAVY RAINS.

&&

LAT...LON 3895 11993 3889 11984 3883 11990 3891 12002
      3898 11993
TIME...MOT...LOC 0038Z 310DEG 3KT 3890 11993

HOON