Special Weather Statement, NWS Flagstaff, AZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
943 AM MST MON JUN 29 2015

.SYNOPSIS...MONSOONAL MOISTURE IN PLACE ACROSS NORTHERN ARIZONA
WILL LEAD TO GOOD CHANCES FOR SHOWERS AND THUNDERSTORMS ACROSS
NORTHERN ARIZONA EACH DAY THROUGH NEXT WEEK. HEAVY
RAINFALL...LIGHTNING...SMALL HAIL AND STRONG WINDS ARE PROBABLE
WITH THESE STORMS.

&&

.DISCUSSION...THE STORM EVOLUTION TODAY SHOULD GENERALLY BE SIMILAR
TO YESTERDAY...WITH STEERING FLOW MOVING THE STORMS WHICH FORM OVER
THE RIM TO THE WEST AND SOUTHWEST OVER YAVAPAI...WESTERN
COCONINO...AND GILA COUNTIES DURING THE AFTERNOON AND EARLY EVENING.
THE STRONGEST...ORGANIZED STORMS ARE EXPECTED TO HAVE A MORE
NORTHERLY MOTION. LATE EVENING AND OVERNIGHT SHOWERS AND
THUNDERSTORMS SHOULD BE EXPECTED AS WELL AS MATURE CONVECTION FROM
THE EAST MOVES INTO THE AREA.

THE PRIMARY DIFFERENCES TO NOTE FROM YESTERDAY IS A SLIGHT INCREASE
IN MOISTURE FROM THIS MORNINGS SOUNDING...AND INCREASED TROPOSPHERIC
SHEAR PROJECTED IN THE FORECAST MODELS. THIS MAY LEAD TO AN
ENHANCEMENT IN THE INTENSITY OF LOCAL STORMS TODAY...WITH MORE
ORGANIZED CONVECTION. ONLY MINOR CHANGES HAVE BEEN MADE TO THE GRIDS
TODAY...WITH THE CURRENT FORECAST LOOKING GOOD AND ON TRACK.

&&

.PREV DISCUSSION /344 AM MST/...ISOLATED SHOWERS AND THUNDERSTORMS
ARE CONTINUING ACROSS YAVAPAI COUNTY EARLY THIS MORNING...WITH
ACTIVITY HAVING CEASED FOR THE TIME BEING ACROSS THE REMAINDER OF
OUR NORTHERN AZ FORECAST AREA. EXPECT THE CONVECTIVE SCENARIO TODAY
TO BE RATHER SIMILAR TO YESTERDAY...WITH INITIAL DEVELOPMENT ACROSS
THE HIGHER TERRAIN THEN MOVING SLOWLY WEST INTO THE VALLEYS OF
YAVAPAI AND NORTHERN GILA COUNTIES. CHANCES FOR STORMS WILL EXIST
ACROSS ALL OF NORTHERN AZ THOUGH. THE PRIMARY HAZARDS FROM THESE
STORMS WILL BE LOCALLY HEAVY RAINFALL...FREQUENT LIGHTNING..AND WIND
GUSTS IN EXCESS OF 50 MPH.

WITH ONLY GRADUAL AND MODEST SHIFTS IN THE MONSOONAL FLOW AND
ASSOCIATED HIGH PRESSURE...DAILY CHANCES FOR THUNDERSTORMS WILL
PERSIST THROUGH THE ENTIRE 7-DAY FORECAST PERIOD.

&&

.AVIATION...FOR THE 18Z PACKAGE...SHRA/TSRA ARE EXPECTED THIS
AFTERNOON AND EVENING...DEVELOPING ALONG THE HIGH TERRAIN FIRST AND
EXPANDING TO THE VALLEYS. STORM MOTION TOWARDS THE WEST WITH WIND
GUSTS TO 40+ KTS AND MVFR VSBY POSSIBLE IN THE VICINITY OF STORMS.
SOME STORM ACTIVITY CONTINUING OVERNIGHT BUT WITH LESS TENDENCY
TOWARD STRONG WIND GUSTS. AVIATION DISCUSSION NOT UPDATED FOR TAF
AMENDMENTS.

&&

.FIRE WEATHER...HIGH PRESSURE WILL REMAIN CENTERED OVER THE GREAT
BASIN WITH MONSOON MOISTURE GRADUALLY INCREASING. AS A RESULT...
SCATTERED THUNDERSTORMS ARE EXPECTED TODAY AND TUESDAY WITH GREATER
COVERAGE NEAR AND SOUTH OF I-40. STRONG AND ERRATIC OUTFLOW WIND
GUSTS AND LIGHTNING WILL REMAIN CONCERNS NEAR ANY STORM ACTIVITY.

WEDNESDAY THROUGH FRIDAY...LITTLE CHANGE IN THE OVERALL PATTERN.
SCATTERED THUNDERSTORMS ARE EXPECTED EACH DAY ACROSS NORTHERN
ARIZONA. LOOK FOR A BIT HIGHER HUMIDITY LEVELS AND SLIGHTLY LOWER
TEMPERATURES.

&&

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

&&

PUBLIC...KD/BAK
AVIATION...AT
FIRE WEATHER...MCCOLLUM/AT

FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT
WEATHER.GOV/FLAGSTAFF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
910 AM MST MON JUN 29 2015

AZZ004>018-037>040-300700-
KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY-
COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS-
NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY-
CHUSKA MOUNTAINS AND DEFIANCE PLATEAU-
LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-
LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY-
LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY-
WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS-
NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS-
OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA-
NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-
910 AM MST MON JUN 29 2015

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

.DAY ONE...TODAY AND TONIGHT
EXPECT THE CONVECTIVE SCENARIO TODAY TO BE RATHER SIMILAR TO
YESTERDAY...WITH INITIAL DEVELOPMENT BEGINNING LATE THIS MORNING
ACROSS THE HIGHER TERRAIN OF THE WHITE MOUNTAINS/MOGOLLON
RIM/COCONINO PLATEAU THEN MOVING SLOWLY WEST INTO THE VALLEYS OF
YAVAPAI AND NORTHERN GILA COUNTIES. COVERAGE IS EXPECTED TO BE LESS
FARTHER NORTH...BUT STORMS ARE ALSO EXPECTED TO FORM OVER THE CHUSKA
MOUNTAINS/BLACK MESA/KAIBAB PLATEAU AND MOVE WEST OVER THE LOWER
ELEVATIONS.

THE PRIMARY HAZARDS FROM THE STRONGEST STORMS TODAY WILL BE LOCALLY
HEAVY RAINFALL...FREQUENT CLOUD TO GROUND LIGHTNING...SMALL
HAIL...AND WIND GUSTS IN EXCESS OF 50 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

WITH ONLY GRADUAL SHIFTS IN THE MONSOONAL FLOW...DAILY CHANCES
FOR THUNDERSTORMS WILL PERSIST THROUGH THE PERIOD.

.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
1208 PM MST MON JUN 29 2015

AZZ007-015-291930-
COCONINO PLATEAU-WESTERN MOGOLLON RIM-
1208 PM MST MON JUN 29 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN COCONINO COUNTY
UNTIL 1230 PM MST...

AT 1207 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 12
MILES NORTH OF WILLIAMS...OR 32 MILES NORTHWEST OF FLAGSTAFF...MOVING
WEST AT 10 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM. THIS STORM WILL CROSS STATE HIGHWAY 64 BETWEEN WILLIAMS
AND VALLE.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHWESTERN
COCONINO COUNTY.

LAT...LON 3551 11202 3539 11201 3534 11233 3554 11235
TIME...MOT...LOC 1907Z 085DEG 11KT 3544 11210

AT