Flash Flood Warning 6, NWS Grand Junction, CO

659 
WGUS75 KGJT 141930
FFSGJT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
130 PM MDT SAT JUL 14 2012

UTC019-037-142200-
/O.CON.KGJT.FF.W.0006.000000T0000Z-120714T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN JUAN UT-GRAND UT-
130 PM MDT SAT JUL 14 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN GRAND AND
NORTHERN SAN JUAN COUNTIES UNTIL 400 PM MDT...

AT 127 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH HEAVY RAINFALL ACROSS THE NEEDLES SECTION OF 
CANYONLANDS NATIONAL PARK.  THUNDERSTORMS ARE LOCATED OVER BUTLER 
WASH...IMPACTING THE ELEPHANT DRUID ARCH TRAIL.  PEOPLE IN THIS AREA 
SHOULD AVOID LOW LYING AREAS AND DRY WASHES OR SLOT CANYONS.

THUNDERSTORMS ARE MOVING NORTH TO NORTHEAST AT 25 MPH AND WILL REACH 
THE MOAB VICINITY BETWEEN 200 AND 230 PM.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...CASTLE 
VALLEY...MOAB...CANYONLANDS AND ARCHES NATIONAL PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...DRY WASHES AND ARROYOS...SLOT CANYONS...COUNTRY 
ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3765 11040 3785 11034 3786 11018 3794 11018
      3799 11012 3799 11001 3807 11005 3818 10991
      3825 10992 3839 11004 3846 11005 3848 11001
      3852 11005 3855 11000 3858 11007 3864 11006
      3871 11012 3888 11012 3889 10920 3766 10946

$$

PF

312 
WGUS75 KGJT 142049
FFSGJT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
249 PM MDT SAT JUL 14 2012

UTC019-037-142200-
/O.CON.KGJT.FF.W.0006.000000T0000Z-120714T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN JUAN UT-GRAND UT-
249 PM MDT SAT JUL 14 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN GRAND AND
NORTHERN SAN JUAN COUNTIES UNTIL 400 PM MDT...

AT 247 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN 
EXTENSIVE AREA OF STEADY RAIN SHOWERS OVER SOUTHERN GRAND COUNTY AND 
NORTHWEST SAN JUAN COUNTY.  DOPPLER RADAR ESTIMATES INDICATE ONE 
QUARTER TO ONE HALF INCH OF RAIN HAS FALLEN ACROSS THIS AREA.  

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE SLOT 
CANYONS AND DRY WASHES OR ARROYOS IN CANYONLANDS AND ARCHES NATIONAL 
PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS 
AND STREAMS OR DRY WASHES AND ARROYOS...COUNTRY ROADS...AS WELL AS 
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3765 11040 3785 11034 3786 11018 3794 11018
      3799 11012 3799 11001 3807 11005 3818 10991
      3825 10992 3839 11004 3846 11005 3848 11001
      3852 11005 3855 11000 3858 11007 3864 11006
      3871 11012 3888 11012 3889 10920 3766 10946

$$

PF

313 
WGUS75 KGJT 142153
FFSGJT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
353 PM MDT SAT JUL 14 2012

UTC019-037-142208-
/O.EXP.KGJT.FF.W.0006.000000T0000Z-120714T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN JUAN UT-GRAND UT-
353 PM MDT SAT JUL 14 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN GRAND AND
NORTHERN SAN JUAN COUNTIES WILL BE ALLOWED TO EXPIRE AT 400 PM MDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3765 11040 3785 11034 3786 11018 3794 11018
      3799 11012 3799 11001 3807 11005 3818 10991
      3825 10992 3839 11004 3846 11005 3848 11001
      3852 11005 3855 11000 3858 11007 3864 11006
      3871 11012 3888 11012 3889 10920 3766 10946

$$

NL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1039 AM MDT SAT JUL 14 2012

.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 352 AM MDT SAT JUL 14 2012

MONSOON MOISTURE WILL CONTINUE SURGING NORTH ACROSS THE FORECAST
AREA TODAY WITH ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS
EXPECTED. MORNING CONVECTION WILL BE DISSIPATING AFTER SUNRISE...BUT
WILL RE-FIRE BY MIDDAY AS CONDITIONS DESTABILIZE ONCE AGAIN.
ATTM...NO MAJOR TRIGGER IN OUR AREA TO KICK OFF WIDESPREAD HEAVY
RAIN AND SFC HEATING WILL BE KNOCKED BACK A BIT BY EXTENSIVE CLOUD
SHIELD TODAY. AS A RESULT...WILL NOT BE ISSUING ANY FLASH FLOOD
WATCHES EVEN WITH PRECIPITABLE WATER VALUES EXCEEDING ONE INCH.
STILL WILL BE SOMETHING TO MONITOR AS THE DAY PROGRESSES...SHOULD
THE CLOUD SHIELD ERODE SUFFICIENTLY AND ALLOW DEEPER CONVECTION TO
DEVELOP. STILL EXPECT DECENT COVERAGE OF SHOWERS AND HAVE BOOSTED
POPS INTO THE LIKELY CATEGORY FOR MUCH OF THE AREA THIS AFTERNOON.
HAVE ALSO SLICED TEMPS BACK A NOTCH WITH DENSER CLOUD COVER AND
HIGHER SFC MOISTURE IN PLACE.

TONIGHT AND SUNDAY...WITH THE MONSOONAL PLUME DIRECTLY
OVERHEAD...SHOWERS WITH EMBEDDED THUNDERSTORMS WILL BE SLOW TO
DISSIPATE. IN ADDITION TO THE MOISTURE PLUME...A BROAD TROUGH THAT
COVERS MUCH OF THE WRN CONUS WILL INCREASE SHEAR. THIS SPEED SHEAR
WILL BE IN THE 20-30 KNOT RANGE WITH THE AXIS FROM SE UTAH TO NW
COLORADO. THIS WOULD BE FAVORABLE FOR SOME ORGANIZED STRONG PULSE
STORMS AND MULTICELLS...EXCEPT IT WILL BE OUT OF PHASE WITH THE
DIURNAL CYCLE. AT ANY RATE...SCATTERED SHOWERS MAY PERSIST THROUGH
THE NIGHT. SPEED SHEAR WEAKENS A NOTCH BY SUNDAY AFTERNOON...BUT
STRONGER THAN NORMAL PULSE STORMS HAVE THE POTENTIAL TO BE GOOD
HEAVY RAINERS.

.LONG TERM...(SUNDAY NIGHT THROUGH FRIDAY)
ISSUED AT 352 AM MDT SAT JUL 14 2012

AIR MASS REMAINS MOIST SUNDAY NIGHT AND EXPECT SHOWERS WITH
EMBEDDED STORMS TO LIVE BEYOND MIDNIGHT. THE AXIS OF THE DEEPEST
MOIST LAYER SHIFTS EAST AND WILL BE POSITIONED OVER THE WESTERN
SLOPE ON MONDAY AFTERNOON...THEREFORE THE BEST OR STRONGEST
CONVECTIVE ACTIVITY WILL BE OVER THE ERN HALF OF THE FORECAST
AREA WITH LESS ACTION OVER ERN UTAH. THIS TREND CONTINUES INTO
TUESDAY AS THE PACIFIC NORTHWEST TROUGH ATTEMPTS TO MOVE INLAND.
CURRENT MODEL DATA INDICATE THAT SOME DRIER AIR REACHES WRN
COLORADO. NOT DRY ENOUGH TO SHUT DOWN CONVECTIVE STORMS...BUT
REDUCE CAPE VALUES WITH MOST STORMS CONFINED TO THE CENTRAL AND
SOUTHERN HIGH COUNTRY.

DRYING TREND CONTINUES FROM WEDNESDAY THROUGH THE END OF THE WEEK
WITH MOISTURE PLUME SHUNTED EAST. THIS WILL KEEP THE BEST CHANCE
OF DIURNALLY DRIVEN CONVECTION OVER THE SAN JUANS AND ALONG THE
DIVIDE.

TEMPERATURES WILL BE CLIMBING ONCE AGAIN AS THE ATMOSPHERE DRIES
OUT WITH READINGS RETURNING TO ABOVE NORMAL BY THE END OF THE
WEEK.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SUNDAY AFTERNOON)
ISSUED AT 1033 AM MDT SAT JUL 14 2012

STILL EXPECT MONSOON MOISTURE TO CONTINUE SURGING NORTHWARD UNABATED
OVER THE REGION THROUGH SUNDAY. SEVERAL EMBEDDED DISTURBANCES
WITHIN THE SOUTHERLY FLOW WILL CONTINUE TO GENERATE WIDESPREAD SHOWERS
AND THUNDERSTORMS ACROSS THE REGION. DURING THE PERIOD FROM 18Z
TODAY TO ROUGHLY 03Z SUNDAY...DAYTIME HEATING COMBINED WITH
INCREASED MONSOON MOISTURE WILL GENERATE STRONGER STORMS CAPABLE
OF RESULTING IN MVFR CIGS/VSBY AND EVEN LOCALIZED IFR CONDITIONS
IN HEAVY RAINFALL. WIND GUSTS TO 40 MPH ARE POSSIBLE IN THE VICINITY
OF STRONGER CELLS. MOUNTAINS WILL BE FREQUENTLY OBSCURED AND
AIRPORTS IN THE SOUTHERN AND CENTRAL VALLEYS WILL HAVE A GOOD
CHANCE OF EXPERIENCING BRIEF PERIODS OF MVFR CIGS AND/OR VSBY IN
HEAVY RAIN. CONDITIONS ARE EXPECTED TO IMPROVE BEYOND 03Z SUNDAY
WITH SHOWERS BECOMING MORE SCATTERED IN NATURE.

&&

.GJT WATCHES/WARNINGS/ADVISORIES...
CO...NONE.
UT...NONE.
&&

SHORT TERM...JDC/PF
LONG TERM...PF/JDC
AVIATION...TGJT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
510 AM MDT SAT JUL 14 2012

COZ001>014-017>023-UTZ022>025-027>029-151200-
LOWER YAMPA RIVER BASIN-CENTRAL YAMPA RIVER BASIN-
ROAN AND TAVAPUTS PLATEAUS-ELKHEAD AND PARK MOUNTAINS-
UPPER YAMPA RIVER BASIN-GRAND VALLEY-DEBEQUE TO SILT CORRIDOR-
CENTRAL COLORADO RIVER BASIN-GRAND AND BATTLEMENT MESAS-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
WEST ELK AND SAWATCH MOUNTAINS-FLATTOPS-
UPPER GUNNISON RIVER VALLEY-UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-
NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS-
PARADOX VALLEY/LOWER DOLORES RIVER-
FOUR CORNERS/UPPER DOLORES RIVER-ANIMAS RIVER BASIN-
SAN JUAN RIVER BASIN-SOUTHEAST UTAH-EASTERN UINTA MOUNTAINS-
EASTERN UINTA BASIN-TAVAPUTS PLATEAU-ARCHES/GRAND FLAT-
LA SAL AND ABAJO MOUNTAINS-CANYONLANDS/NATURAL BRIDGES-
510 AM MDT SAT JUL 14 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN
COLORADO.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF EASTERN UTAH
AND WESTERN COLORADO THROUGH TONIGHT. LOCALLY HEAVY RAINFALL WILL
BE POSSIBLE...ESPECIALLY ACROSS SOUTHEAST UTAH AND SOUTHWEST
COLORADO. SMALL HAIL AND WINDS GUSTING TO OVER 40 MPH WILL ALSO BE
POSSIBLE WITH THE STRONGEST STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE WILL BE A CHANCE OF SHOWERS AND THUNDERSTORMS EACH DAY.
LOCALLY HEAVY RAIN...SMALL HAIL...AND FREQUENT CLOUD TO GROUND
LIGHTNING STRIKES WILL OCCUR WITH THE STRONGEST STORMS. MUD DEBRIS
FLOWS AND SUDDEN INCREASES IN WATER IN SMALL CREEKS AND STREAMS
WILL BE POSSIBLE THROUGH THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.