Flash Flood Warning 4, NWS Reno, NV

000 
WGUS75 KREV 310152
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
652 PM PDT SAT MAY 30 2009

NVC019-310530-
/O.CON.KREV.FF.W.0004.000000T0000Z-090531T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON NV-
652 PM PDT SAT MAY 30 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM PDT FOR
CENTRAL LYON COUNTY...

AT 644 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE WARNED 
AREA WITH RAINFALL AMOUNTS EXCEEDING TWO INCHES PER HOUR OVER THE 
LAST HOUR. ADDITIONAL HEAVY TO MODERATE RAINFALL WILL CONTINUE 
THROUGH 8 PM THIS EVENING.

THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER 
MAINLY RURAL AREAS OF THE INDICATED COUNTY.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES...ESPECIALLY ALONG 
ALTERNATE HIGHWAY 95 SOUTH OF FORT CHURCHILL STATE PARK AND NORTH OF 
WABUSKA. ADDITIONALLY...COUNTRY ROADS...FARMLAND...AND RANCHLAND 
ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE 
SUBJECT TO FLOODING.

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. JUST A FEW INCHES OF FAST FLOWING WATER IS
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING
FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...BE SURE YOU ARE IN A SAFE PLACE FIRST. THEN 
CONTACT THE NATIONAL WEATHER SERVICE IN RENO AT 775-673-8100. YOUR 
REPORT MAY SAVE LIVES

LAT...LON 3926 11929 3926 11912 3907 11919 3909 11937

$$

HOON

000 
WGUS75 KREV 310358
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
858 PM PDT SAT MAY 30 2009

NVC019-310407-
/O.CAN.KREV.FF.W.0004.000000T0000Z-090531T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON NV-
858 PM PDT SAT MAY 30 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL LYON
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.

IF YOU OBSERVED FLOODING EARLIER IN THE WARNED AREA...CONTACT THE
NATIONAL WEATHER SERVICE IN RENO AT 775-673-8100. YOUR REPORTS HELP
US IMPROVE OUR WARNING PROCESS.

LAT...LON 3926 11929 3926 11912 3907 11919 3909 11937

$$

HOON

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
211 PM PDT SAT MAY 30 2009

.SHORT TERM...
DIURNAL CONVECTION IS ONCE AGAIN DEVELOPING THIS AFTERNOON WITH
UNSTABLE ATMOSPHERE AND MUCH ABOVE NORMAL MOISTURE. CURRENT
PRECIPITABLE WATER ESTIMATES FROM SOUNDINGS...SATELLITE
IMAGERY...AND MODEL DATA INDICATE MOISTURE IS 2-3 STANDARD
DEVIATIONS ABOVE NORMAL. COUPLE THIS MOISTURE WITH THE VERY LIGHT
FLOW ALOFT AND SLOW MOVING THUNDERSTORMS WILL CONTINUE TO PRODUCE
IMPRESSIVE RAIN RATES THROUGH THIS EVENING.

CURRENTLY THE BEST THUNDERSTORM DEVELOPMENT HAS BEEN OVER THE
HIGHER TERRAIN OF THE SIERRA HOWEVER RELATIVELY CLOUD FREE SKIES
ARE ALLOWING THE GREAT BASIN ZONES TO HEAT UP WELL. SACRAMENTO TO
RENO GRADIENT IS SLOWLY BECOMING MORE POSITIVE AND SIERRA CREST
SENSORS ARE BEGINNING TO SHOW WEST WINDS. THIS WILL HELP GENERATE
LOW LEVEL CONVERGENCE EAST OF THE SIERRA CREST AND PUSH THE STORMS
INTO THE SURROUNDING VALLEYS. CURRENT CLOUD DEVELOPMENT IS STILL
LOOKING RATHER CAPPED AND NOT EXPECTING ENOUGH UPWARD ENERGY TO
BREAK THROUGH THIS CAP IN MANY LOCATIONS. FOR THIS REASON...ONLY
EXPECTING SCATTERED COVERAGE OF STORMS THROUGH THIS EVENING.
STORMS THAT DO DEVELOP HOWEVER HAVE THE POTENTIAL TO BE RATHER
STRONG AS LONG AS THEY DONT REMAIN COMPLETELY STATIONARY AND RAIN
THEMSELVES OUT.

SOUTHWEST FLOW ALOFT BEGINS INCREASING SUNDAY HOWEVER CONVECTION
WILL STILL INITIALLY DEVELOP OVER THE SIERRA. BY AFTERNOON THE
WEST WINDS SHOULD KICK IN AND PUSH THUNDERSTORM ACTIVITY EAST OF
THE CREST. THE BEST CHANCES SUNDAY ARE OVER THE FAR NRN ZONES
WHERE UPPER DIVERGENCE IS AIDED BY AN APPROACHING UPPER JET.

TARGETING THE BEST LOCATIONS FOR CONVECTION BECOMES INCREASINGLY
DIFFICULT BEYOND SUNDAY AS THE WEATHER PATTERN BEGINS TO SLOWLY
CHANGE. THE UNSEASONABLE UPPER LOW CURRENTLY ALONG 140W SLOWLY MOVES
CLOSER TO THE WEST COAST MONDAY AND TUESDAY. THE MOISTURE ALREADY
IN PLACE DOES NOT LOOK TO DISAPPEAR ANYTIME SOON...HOWEVER THE
INSTABILITY SLOWLY DECREASES WHILE THE UPPER FORCING SLOWLY
INCREASES. THIS MEANS THAT CONVECTION WILL NO LONGER BE SURFACE
BASED AND TERRAIN INFLUENCED AND INSTEAD BE DRIVEN BY UPPER
FORCING AS THE LOW PUSHES TOWARD THE COAST.

UPPER LEVEL LAPSE RATES BEGIN TO DECREASE MONDAY INDICATING MORE
STABILITY...HOWEVER THIS MAY BE MISLEADING AS OTHER CONVECTIVE
PARAMETERS LOOK MORE FAVORABLE. BULK SHEAR INCREASES WITH
INCREASING SOUTHWEST FLOW ALOFT AND UPPER DIVERGENCE IS FURTHER
AIDED BY THE SOUTHERLY UPPER JET. MODELS ALSO INDICATE A DECENT
TROPOPAUSE UNDULATION AHEAD OF THE UPPER LOW PUSHING NORTH THROUGH
THE CWA LATE IN THE DAY. ALL THESE INGREDIENTS COULD MAKE FOR MORE
ORGANIZED STORMS ALTHOUGH THE COVERAGE MAY NOT BE AS GREAT. ALSO
THE FASTER STORM MOVEMENT WILL BRING LESS RAINFALL POTENTIAL.

BY TUESDAY...SHOWER DEVELOPMENT WILL MAINLY BE FROM THE UPPER LOW
MOVING INTO THE WEST COAST AS OPPOSED TO INSTABILITY AND SURFACE
HEATING. HIGHEST POPS STARTING TUESDAY ARE OVER THE SIERRA AND
OTHER LOCATIONS CLOSEST TO THE UPPER LOW. THERE IS STILL ENOUGH
INSTABILITY FOR THUNDERSTORMS...HOWEVER SHOWER COVERAGE WILL BE
MUCH GREATER WITH ONLY EMBEDDED LIGHTNING STRIKES. JORDAN

.LONG TERM...WEDNESDAY THROUGH SATURDAY...
MEDIUM RANGE MODELS CONTINUE TO SHOW THE SAME SYNOPTIC EVOLUTION
THAT THEY DID YESTERDAY.  ON WEDNESDAY THE GFS...ECMWF AND CANADIAN
CONTINUE TO SHOW A BROAD CUT OFF LOW JUST OFF THE CALIFORNIA COAST.
WITH THE SYNOPTIC FLOW REMAINING FAR TO THE NORTH OVER BRITISH
COLUMBIA AND ALBERTA THIS SYSTEM SHOULD REMAIN STATIONARY.  THE
MODEL SOLUTIONS START TO DIVERGE ON THURSDAY.  THE CANADIAN STARTS
TO TAKE THE UPPER LOW TO THE EAST BY 00Z FRIDAY.  THE GFS AND EURO
HOWEVER KEEP THE LOW OVER THE ERN PACIFIC.

BY SATURDAY THE EURO BRINGS THIS UPPER LOW ACROSS CNTRL CALIFORNIA
AND TO THE SIERRA BY 00Z SUNDAY.  THE GFS IS THE LEAST PROGRESSIVE
OF THE THREE MODELS KEEPING THE LOW STILL OFFSHORE ON SATURDAY.  THE
DIVERGENCE AMONG THE MODELS LESSENS CONFIDENCE IN THE SYNOPTIC
EVOLUTION AND RESULTING WEATHER FOR LATE IN THE EXTENDED.  THE EURO
...AND ESPECIALLY THE CANADIAN...SOLUTIONS WOULD INCREASE CLOUD
COVER AND PRECIP CHANCES OVER THE ERN SIERRA AND WRN GREAT BASIN FOR
FRIDAY AND SATURDAY.  THE GFS HOWEVER WOULD KEEP A STRONG SLY FLOW
OVER THE REGION WITH INCREASED TEMPERATURES BOTH AT THE SFC AND AT
UPR LEVELS.  THIS WOULD HELP TO INCREASE LLVL STABILITY AND LESSEN
PRECIP CHANCES.

WITH THIS UNCERTAINTY AMONG THE MODELS HAVE DECIDED TO NOT MAKE ANY
MAJOR CHANGES TO THE EXTENDED FORECAST.  WITH THE UPPER LOW NEAR THE
REGION WILL CONTINUE WITH A CHANCE OF TSTMS THROUGH THE EXTENDED.
TEMPERATURES SHOULD BE NEAR NORMAL FOR EARLY JUNE.  OHARA

&&

.AVIATION...
SCT TSTMS WILL CONTINUE ACROSS THE AREA THIS EVENING.  THE MAIN
THREAT FROM THESE STORMS WILL BE GUSTY OUTFLOW WINDS OF UP TO 50
KTS.  HEAVY RAINFALL WILL ALSO BE ASSOCIATED WITH THE STRONGER
TSTMS.  CONVECTIVE ACTIVITY SHOULD TAPER OFF BY 31/03Z.  OHARA

&&

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

HTTP://WEATHER.GOV/RENO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RENO NV
457 AM PDT SAT MAY 30 2009

CAZ070>073-NVZ001>005-310000-
SURPRISE VALLEY CALIFORNIA-LASSEN-EASTERN PLUMAS-
EASTERN SIERRA COUNTIES-GREATER LAKE TAHOE AREA-MONO-
MINERAL AND SOUTHERN LYON COUNTIES-GREATER RENO-CARSON CITY-
MINDEN AREA-WESTERN NEVADA BASIN AND RANGE INCLUDING PYRAMID LAKE-
NORTHERN WASHOE COUNTY-
457 AM PDT SAT MAY 30 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE EASTERN SIERRA...
NORTHEAST CALIFORNIA AND WESTERN NEVADA.

.DAY ONE...TODAY AND TONIGHT

MOISTURE AND INSTABILITY REMAINS OVER THE AREA TODAY. SHOWERS AND
THUNDERSTORMS WILL DEVELOP EARLY THIS AFTERNOON AND CONTINUE
THROUGH THIS EVENING.

THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HAIL...GUSTY OUTFLOW
WINDS OF 40 TO 50 MPH AND HEAVY RAIN. A FEW STORMS MAY REACH SEVERE
LIMITS...BUT THE OVERALL CHANCE OF SEVERE WEATHER TODAY IS LOW.
THE HIGHEST CHANCE FOR HEAVY RAIN IS IN THE SIERRA...WHICH MAY
PRODUCE PONDING OF WATER ON ROADS AND INCREASED RUNOFF NEAR STEEP
TERRAIN.

ACROSS WESTERN NEVADA...THUNDERSTORM OUTFLOWS WILL CREATE AREAS OF
BLOWING DUST AND VISIBILITY OF 3 MILES OR LESS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

A FAVORABLE PATTERN FOR THUNDERSTORMS IS LIKELY TO CONTINUE NEXT
WEEK AS A STRONGER LOW PRESSURE SYSTEM NEARS THE CALIFORNIA COAST
MONDAY. WITH THE LOW NEAR THE COAST...THE CHANCE FOR ORGANIZED
THUNDERSTORMS WILL INCREASE. ORGANIZED THUNDERSTORMS CAN HAVE A
LONGER LIFE SPAN AND A HIGHER CHANCE OF PRODUCING SEVERE WEATHER
AND HEAVY RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER TO THE
NATIONAL WEATHER SERVICE OFFICE.

BRONG

HTTP://WEATHER.GOV/RENO

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RENO NV
305 PM PDT SAT MAY 30 2009

NVZ004-302300-
WESTERN NEVADA BASIN AND RANGE INCLUDING PYRAMID LAKE-
305 PM PDT SAT MAY 30 2009

...THUNDERSTORMS FORMING ALONG HIGHWAY 50 EAST OF FALLON...

AT 258 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
THUNDERSTORMS ALONG A LINE EXTENDING FROM SAND MOUNTAIN NORTH TO THE
DIXIE VALLEY...OR ALONG A LINE EXTENDING FROM 21 MILES NORTHEAST OF
FALLON TO 19 MILES SOUTHEAST OF FALLON...AND MOVING WEST AT 15 MPH.

OCCASIONAL LIGHTNING...MODERATE RAIN WITH RAINFALL AMOUNTS OF AROUND
ONE HALF INCH PER HOUR...SMALL PEA SIZE HAIL...AND GUSTY WINDS OF UP
TO 40 MPH...WITH AREAS OF BLOWING DUST... ARE EXPECTED WITH THESE
STORMS.

* LOCATIONS AFFECTED INCLUDE...FALLON...FALLON STATION...SAND
  MOUNTAIN...STILLWATER AND FALLON MUNICIPAL AIRPORT.

BE AWARE THAT A GUST FRONT PRECEDING THESE STORMS WILL GENERATE
STRONG AND GUSTY WINDS WELL BEFORE THE ARRIVAL OF ANY RAIN.

THESE STORMS WILL AFFECT TRAVELERS ON HIGHWAY 50 EAST OF FALLON.
DRIVERS SHOULD EXPECT STRONG GUSTY CROSS WINDS...WITH RAPID
VISIBILITY REDUCTIONS. HEAVY RAINFALL WILL RESULT IN PONDING WATER.
SLOW DOWN WHEN ENCOUNTERING HEAVY RAIN AND TURN ON YOUR HEADLIGHTS.

JORDAN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RENO NV
439 PM PDT SAT MAY 30 2009

CAZ071-NVZ001>005-310030-
GREATER LAKE TAHOE AREA-GREATER RENO-CARSON CITY-MINDEN
AREA-LASSEN-EASTERN PLUMAS-EASTERN SIERRA COUNTIES-MINERAL AND
SOUTHERN LYON COUNTIES-NORTHERN WASHOE COUNTY-WESTERN NEVADA BASIN
AND RANGE INCLUDING PYRAMID LAKE-
439 PM PDT SAT MAY 30 2009

...THUNDERSTORMS CONTINUE TO DEVELOP ACROSS WESTERN NEVADA...

AT 431 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A CLUSTER OF THUNDERSTORMS OVER WESTERN NEVADA. THE MAIN STORMS ARE
WEST OF PYRAMID LAKE NEAR WINNEMUCCA RANCH ROAD...SOUTHEAST OF RENO
NEAR VIRGINIA CITY...AND OVER HIGHWAY 395 SOUTH GARDNERVILLE. THESE
STORMS WILL CONTINUE SLOWLY MOVING WEST AT 10 MPH.

OCCASIONAL LIGHTNING...HEAVY RAIN WITH RAINFALL AMOUNTS OF AROUND
ONE INCH PER HOUR...SMALL PEA SIZE HAIL...AND GUSTY WINDS OF AROUND
30 TO 40 MPH... ARE EXPECTED WITH THESE STORMS.

* LOCATIONS AFFECTED INCLUDE...CARSON CITY...DAYTON...GARDNERVILLE...
  GARDNERVILLE RANCHOS...GOLD HILL AND HOLBROOK JUNCTION.

THIS STORM WILL AFFECT TRAVELERS ON HIGHWAY 395...HIGHWAY 50...AND
THE PYRAMID LAKE HIGHWAY. DRIVERS SHOULD EXPECT STRONG GUSTY CROSS
WINDS...WITH RAPID VISIBILITY REDUCTIONS. HEAVY RAINFALL WILL RESULT
IN PONDING WATER. SLOW DOWN WHEN ENCOUNTERING HEAVY RAIN AND TURN ON
YOUR HEADLIGHTS.

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

JORDAN