Severe Thunderstorm Warning 42, NWS Flagstaff, AZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
255 PM MST SUN JUL 31 2005

.SYNOPSIS...WITH HIGH PRESSURE CENTERED TO THE EAST...DEEP MONSOONAL
MOISTURE WILL REMAIN OVER NORTHERN ARIZONA THIS WEEK. LOOK FOR
SCATTERED SHOWERS AND THUNDERSTORMS TO DEVELOP EACH DAY.
TEMPERATURES ARE EXPECTED TO REMAIN NEAR SEASONAL NORMALS.
&&

.DISCUSSION...500MB HIGH CENTER STILL POSITIONED OFF THE OUR
EAST...GENERALLY AROUND THE GREAT PLAINS OF EASTERN COLORADO AND
WESTERN KANSAS THIS AFTERNOON. THIS WILL ALLOW A MOIST SOUTHERLY
FLOW ALOFT TO CONTINUE. CURRENTLY...AFTERNOON SHOWERS AND
THUNDERSTORMS HAVE DEVELOPED ACROSS THE HIGHER TERRAIN OF THE
MOGOLLON RIM AND COCONINO COUNTIES. STORMS HAVE BEEN A LITTLE SLOWER
WORKING THEIR WAY INTO LOWER TERRAIN REGIONS THAN THE PAST FEW
DAYS...BUT ARE STILL EXPECTED TO PROCEED IN THIS FASHION BY THE LATE
AFTERNOON AND EARLY EVENING. SURFACE DEWPOINTS REMAIN IN THE 50S FOR
MOST OF THE AREA...AND LATEST GPS-IPW SENSOR READING STILL SHOWS
PRECIPITABLE WATER VALUES HOLDING STEADY IN THE 0.9 RANGE. LOOK FOR
SOME OF THE CURRENT ACTIVITY TO SLOWLY DIE OUT OVERNIGHT THOUGH...AS
THE SHOWERS ARE HEAVILY DRIVEN BY DIURNAL HEATING FACTORS.

FOR MUCH OF THE COMING WEEK...SYNOPTIC WEATHER PATTERN LOOKS RATHER
CONSISTENT WITH HIGH PRESSURE STAYING CENTERED TO THE EAST THROUGH
AT LEAST MID-WEEK. AS SUCH...NO LARGE SWINGS IN DAILY CONVECTIVE
ACTIVITY ARE ANTICIPATED. WILL KEEP WITH A FORECAST OF MODERATE
MONSOON POPS AND TEMPS CONTINUING NEAR SEASONAL NORMS.
&&

.AVIATION...FOR 00Z PACKAGE...WDLY SCT STORMS CAN BE EXPECTED MAINLY
NORTH OF THE MOGOLLON RIM WITH BASES AROUND 15K FEET MSL.
ELSEWHERE...WITH TROPICAL MOISTURE ENTRENCHED OVER THE AREA...EXPECT
STORMS TO CONTINUE MAINLY WEST AND SOUTH OF A LINE FROM ST. JOHNS TO
FLAGSTAFF TO PAGE WITH SCT COVERAGE INTO THE EVENING HOURS AND CLOUD
BASES BETWEEN 10K-13K FEET MSL. STORMS TO THE SOUTH OF FLAGSTAFF
WILL MOVE TO THE NORTHWEST AND STORMS TO THE NORTH OF FLAGSTAFF WILL
MOVE TO THE NORTH. EXPECT STORMS TO DECREASE TO WDLY SCT SHOWERS AND
THUNDERSTORMS AFT 04Z. EXPECT MORE STORMS TO DEVELOP OVER THE HIGHER
TERRAIN BETWEEN 1100 AM TO 100 PM MST MONDAY. AVIATION DISCUSSION
NOT UPDATED FOR AMENDMENTS.
&&

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

KD/TC

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1000 AM MST SUN JUL 31 2005

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-
1000 AM MST SUN JUL 31 2005

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

.DAY ONE...TODAY

THE AIR MASS REMAINS VERY MOIST OVER NORTHERN ARIZONA WITH WIDESPREAD
THUNDERSTORMS EXPECTED TO DEVELOP AGAIN THIS AFTERNOON. STORMS WILL
FORM FIRST OVER THE MOGOLLON RIM AND WHITE MOUNTAIN AREAS.
ADDITIONAL STORMS WILL DEVELOP AND MOVE INTO THE LOWER ELEVATIONS OF
YAVAPAI AND NORTHERN GILA COUNTIES...AND THE REMAINDER OF NORTHERN
ARIZONA. DUE TO THE HIGH WATER CONTENT OF THE ATMOSPHERE...THE MAIN
THREAT FROM THESE STORMS WILL BE HEAVY RAINFALL AMOUNTS AND THE
POTENTIAL FOR FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

LITTLE CHANGE IS SEEN IN THE WEATHER PATTERN THROUGH THIS PERIOD
WITH THUNDERSTORMS FORMING EACH DAY. THE POTENTIAL FOR HEAVY RAINS
AND FLASHING FLOODING WILL REMAIN.

.SPOTTER INFORMATION STATEMENT...

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