Special Weather Statement, NWS Flagstaff, AZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
923 AM MST TUE JUL 31 2012

.SYNOPSIS...A MOIST SOUTHEASTERLY FLOW WILL KEEP NORTHERN ARIZONA IN
A WET MONSOON PATTERN TODAY. SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED WITH LOCALLY HEAVY RAINFALL. A SLIGHT
DRYING TREND WILL DEVELOP WEDNESDAY THROUGH THE END OF THE WEEK.

&&

.DISCUSSION...CURRENT FORECAST PACKAGE LOOKS GOOD WITH NO UPDATES
PLANNED THIS MORNING. AS PREVIOUSLY MENTIONED...STRONGER MID LEVEL
WINDS ACROSS NORTHERN AZ THIS MORNING...NOTED BY A 40+ KT SPEED MAX
AROUND 500-550 MB ON THE FGZ SOUNDING...WILL RESULT IN STRONGER WIND
SHEAR AND MAY LEAD TO A FEW STRONGER STORMS TODAY. HEAVY
RAIN...MARGINALLY SEVERE HAIL...AND STRONG GUSTY WINDS WILL ALL BE
POSSIBLE. BEST STORM COVERAGE IS EXPECTED ACROSS FAR WESTERN AZ
WHERE MOISTURE PROFILES REMAIN DEEPEST...THUS THIS AREA WILL SEE THE
BEST THREAT FOR LOCALIZED FLOODING AS WELL.

&&

.PREVIOUS DISCUSSION (230 AM MST)...SIMILAR PATTERN TO YESTERDAY
WILL CONTINUE TODAY WITH A STRONG AREA OF HIGH PRESSURE ALOFT
CENTERED OVER THE SOUTHERN PLAINS. CIRCULATION AROUND THIS FEATURE
WILL MAINTAIN THE SOUTHEASTERLY FLOW OVER ARIZONA AND WILL CONTINUE
TO BRING TROPICAL MOISTURE NORTHWARD ACROSS THE STATE.

WEAK CYCLONIC CENTER AND INVERTED TROUGH REMAIN ACROSS THE SOUTHWEST
WITH THE CENTER OVER SRN CALIF AND THE TROUGH EXTENDING NORTHWARD
ALONG THE AZ/NV BORDER TODAY. AN AREA OF SLIGHTLY STRONGER WINDS
ALOFT WILL BE LOCATED TO THE EAST OF THIS LOW. THIS BAND OF STRONGER
WINDS WILL RESULT IN FASTER STORM MOTION TODAY AND THIS COULD
MITIGATE THE IMPACT OF HEAVY RAINS. IN ADDITION...THE STRONGER WINDS
AND SHEAR WILL ALLOW A FEW STORMS TO BECOME MARGINALLY SEVERE WITH
SMALL HAIL AND STRONG WINDS POSSIBLE.

ON WEDNESDAY...THE CYCLONIC SYSTEM WILL MOVE NORTHWARD AND THE FLOW
ACROSS AZ WILL BEGIN TO VEER MORE TO THE SOUTHWEST. THIS WILL START A
SLIGHT DRYING TREND ACROSS THE STATE THAT SHOULD CONTINUE FOR THE
NEXT SEVERAL DAYS.

&&

.AVIATION...FOR THE 18Z PACKAGE...SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS WILL DEVELOP THROUGH THE AFTERNOON HOURS. EXPECT
EXTREMELY HEAVY RAIN UNDER ANY STORMS ALONG WITH ERRATIC GUSTY
WINDS. STORMS WILL DIMINISH IN COVERAGE BECOMING MORE ISOLATED AFTER
02Z. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS.

&&

.FGZ WATCHES/WARNINGS/ADVISORIES...NONE.

&&

PUBLIC.........MCS/DB
AVIATION.......MCCOLLUM

FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
500 AM MST TUE JUL 31 2012

AZZ004>018-037>040-010700-
WESTERN MOGOLLON RIM-GRAND CANYON COUNTRY-YAVAPAI COUNTY MOUNTAINS-
YAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONS-
MARBLE AND GLEN CANYONS-KAIBAB PLATEAU-COCONINO PLATEAU-
NORTHEAST PLATEAU AND MESAS HWY 264 NORTHWARD-
NORTHEAST PLATEAU AND MESAS SOUTH OF HWY 264-
CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAU-
BLACK MESA AREA-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-
LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY-
LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY-
EASTERN MOGOLLON RIM-WHITE MOUNTAINS-NORTHERN GILA COUNTY-
500 AM MST TUE JUL 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN
GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA.

.DAY ONE...TODAY

A MOIST AND UNSTABLE AIR MASS WILL CONTINUE TO BRING MODERATE TO
HEAVY SHOWERS AND THUNDERSTORMS TO NORTHERN ARIZONA TODAY AND
TONIGHT. SOME OF THESE STORMS MAY PRODUCE SUBSTANTIAL RAINFALL IN A
SHORT PERIOD OF TIME RESULTING IN LOCALIZED FLOODING. SMALL HAIL AND
STRONG WINDS ARE ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SHOWERS AND THUNDERSTORMS WILL CONTINUE EACH DAY BUT THE RISK OF
HEAVY RAINFALL WILL DECREASE DURING THE LATTER HALF OF THE WEEK.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1055 AM MST TUE JUL 31 2012

AZZ014-311815-
APACHE AZ-
1055 AM MST TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHWESTERN APACHE COUNTY IN NORTHEAST ARIZONA

UNTIL 1115 AM MST

AT 1052 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR VERNON...MOVING NORTH AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
   VERNON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN
A STURDY BUILDING.

IN ADDITION...VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME
ROADS AND MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL
SLOW DOWN TO REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE
DISTANCE BETWEEN YOURSELF AND OTHER VEHICLES.

&&

LAT...LON 3421 10965 3423 10966 3422 10971 3426 10975
      3426 10984 3430 10985 3444 10985 3448 10968
      3421 10963
TIME...MOT...LOC 1755Z 168DEG 13KT 3424 10975

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1104 AM MST TUE JUL 31 2012

AZZ013-016-311830-
NAVAJO AZ-
1104 AM MST TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHWESTERN NAVAJO COUNTY IN NORTHEAST ARIZONA

UNTIL 1130 AM MST

AT 1102 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 5 MILES SOUTH OF HEBER-OVERGAARD...MOVING
NORTHWEST AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  HEBER-OVERGAARD...
  RURAL SOUTHWESTERN NAVAJO COUNTY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN
A STURDY BUILDING.

IN ADDITION...VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME
ROADS AND MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL
SLOW DOWN TO REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE
DISTANCE BETWEEN YOURSELF AND OTHER VEHICLES.

&&

LAT...LON 3449 11076 3464 11060 3434 11038 3423 11055
TIME...MOT...LOC 1803Z 143DEG 11KT 3436 11053

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