Severe Thunderstorm Warning 34, NWS Tucson, AZ

000 
WWUS55 KTWC 210037
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
537 PM MST MON JUL 20 2009

AZC019-210100-
/O.CON.KTWC.SV.W.0034.000000T0000Z-090721T0100Z/
PIMA AZ-
537 PM MST MON JUL 20 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MST
FOR SOUTH CENTRAL PIMA COUNTY...

AT 535 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A FEW SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING 
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE TRACKING SOUTHEAST AT 
10 MPH AND EXTENDED SOUTH THROUGH ALTAR VALLEY ALONG STATE HIGHWAY 
286. THE STRONGEST OF THESE STORMS WAS LOCATED NEAR JUNCTION OF 
STATE HIGHWAY 286 AND ARIVACA ROAD...OR 28 MILES SOUTHEAST OF 
SELLS...MOVING SOUTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

LAT...LON 3190 11124 3147 11146 3156 11175 3207 11145
TIME...MOT...LOC 0036Z 305DEG 10KT 3168 11149

$$

000 
WWUS55 KTWC 210057
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
557 PM MST MON JUL 20 2009

AZC019-210105-
/O.EXP.KTWC.SV.W.0034.000000T0000Z-090721T0100Z/
PIMA AZ-
557 PM MST MON JUL 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 600 PM MST...

THUNDERSTORMS TRACKING SOUTHEAST AT 10 MPH THROUGH ALTAR VALLEY 
ALONG STATE HIGHWAY 286 WERE DECREASING IN INTENSITY. SEVERE WINDS 
WERE NO LONGER EXPECTED...BUT ANY GIVEN STORM COULD PRODUCE WIND 
GUSTS TO 50 MPH FOR THE NEXT HOUR. 

LAT...LON 3190 11124 3147 11146 3156 11175 3207 11145
TIME...MOT...LOC 0055Z 305DEG 10KT 3165 11144

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
110 PM MST MON JULY 20 2009

.SYNOPSIS...STRONG HIGH PRESSURE ALOFT WILL BRING HOT CONDITIONS TO
SOUTHEAST ARIZONA THROUGH AT LEAST THE MIDDLE OF THE WEEK. MOISTURE
WILL ALSO BE SUFFICIENT FOR THE DAILY CYCLE OF SCATTERED MAINLY
AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS.

&&

.DISCUSSION...SOME CLOUDS ARE BEGINNING TO FORM OVER THE MOUNTAIN
TOPS AND HIGHER ELEVATIONS OF SOUTHEAST ARIZONA...THOUGH SCATTERED
SHOWER AND THUNDERSTORM ACTIVITY STILL LOOKING TO HOLD OFF. LOOKING
OUTSIDE THE CWA...ACTIVITY HAS STARTED IN EARNEST ALONG THE RIM.
GIVEN WEAK FLOW SEEN IN THE 12Z SOUNDING...NOT CONFIDENT THAT MUCH
OF THAT WILL MAKE ITS WAY DOWN HERE. WILL LIKELY NEED TO WAIT FOR
HOMEGROWN STORMS. STARTING TO SEE JUST A SMALL HANDFUL OF THOSE AT
THE TIME OF THIS WRITING...MAINLY ALONG THE INTERNATIONAL BORDER AND
ONE ISOLATED CELL OVER CENTRAL PIMA COUNTY. DEWPOINTS HAVE FALLEN TO
THE UPPER 40S AND THAT DRYING WILL HELP IN THE FORMATION OF GUSTY
WINDS/DOWNBURSTS FROM ANY STORMS THAT MAY DEVELOP TODAY.

NOT MUCH CHANGE IN THINKING WITH REGARDS TO FORECAST...SO FOR
DETAILS...PLEASE SEE PREV DISCUSSION SECTION BELOW.

&&

.AVIATION...EXPECT ISOLATED TO SCATTERED TSRA/SHRA THE REST OF THIS
AFTERNOON AND EVENING. THE STRONGEST TSRA WILL BE ACCOMPANIED WITH
WIND GUSTS OF 40-45 KTS. OTHERWISE...SCATTERED TO OCCASIONALLY
BROKEN CUMULOFORM CLOUDS WITH BASES 11-13K FT AGL INTO THIS EVENING.
TSRA/ SHRA TO DECREASE IN COVERAGE AFTER 04Z AND ANY CONVECTIVE
CLOUD DEBRIS TO DISSIPATE DURING THE NIGHT. SURFACE WINDS WLY/NWLY
5-15 KTS THRU 06Z THEN SLY/SELY 5-15 KTS LATE TONIGHT AND INTO
TUESDAY MORNING. AVIATION DISCUSSION NOT UPDATED FOR TAF AMENDMENTS.

&&

.FIRE WEATHER...ISOLATED TO SCATTERED THUNDERSTORMS WILL OCCUR THIS
WEEK...WITH THE BULK OF ACTIVITY DURING THE AFTERNOON AND EARLY
NIGHTTIME HOURS. GENERALLY LIGHT DIURNALLY DRIVEN SURFACE WINDS
EXCEPT STRONG AND ERRATIC WINDS NEAR THE STRONGEST THUNDERSTORMS.
ABOVE NORMAL DAYTIME TEMPERATURES TO OCCUR THIS WEEK.

&&

.PREV DISCUSSION...SOME DEBRIS CLOUDINESS TO START THE
MORNING...WHICH LOOKS MORE IMPRESSIVE ON SATELLITE THAN IT DOES OUT
THE WINDOW. TRENDS HAVE IT THINNING...SO THAT IS NOT EXPECTED TO
INTERFERE WITH DEVELOPMENT TODAY. MORE ON THAT LATER. DEWPOINTS AT
AREA ASOS STATIONS WERE MOSTLY IN THE MID 50S...WITH THE EXCEPTION
OF KDUG JUST SHY OF 50. TAKING A LOOK AT THE 12Z SOUNDING...A LITTLE
MORE WET BUT SLIGHTLY MORE STABLE THAN 24 HOURS AGO WITH BETTER
DIRECTIONAL SHEER...THOUGH STILL FAIRLY WEAK FLOW. ALSO OF NOTE ON
THE SATELLITE...ALREADY GETTING SOME ACTIVITY SOUTH OF THE
BORDER...WAY SOUTH...AS WELL AS SOME LINGERING ACTIVITY SOUTHEAST OF
PRESCOTT.

TAKING WHAT IS ALREADY HAPPENING INTO ACCOUNT...12Z NAM SHOWS A
COUPLE OF DISTURBANCES THAT WILL IMPACT SE AZ TODAY...ONE OVER
SOUTHERN NV AT THIS TIME MOVING INTO NORTHERN AZ...THE OTHER PUSHING
INTO SE AZ FROM THE SOUTH. SHOULD THIS HOLD...AND THE AFOREMENTIONED
ACTIVITY HINTS STRONGLY IN FAVOR OF THIS...SHOULD SEE A SIMILAR DAY
TODAY AS WHAT WAS SEEN YESTERDAY...WITH ACTIVITY FLARING UP BOTH ON
THE RIM AND ALONG THE INTERNATIONAL BORDER...EACH SPREADING INTO SE
AZ. WITH THE WEAK FLOW...NOT EXPECTING ANY STORMS THAT DEVELOP TO
MOVE ALL THAT FAST. MORE MOISTURE AT THE SURFACE...SHOULD IT
HOLD...MAY HELP MITIGATE A WIND THREAT FROM STORMS THAT
DEVELOP...BUT GIVEN THAT THERE IS NOT MUCH DIFFERENCE IN CONDITIONS
VERSUS 24 HOURS AGO...DO NOT FEEL COMFORTABLE RULING THAT OUT AT
THIS TIME.

MOVING OUT OF THE VERY SHORT TERM...THE HIGH WOBBLES WESTWARD AND
THIS WOBBLING WILL MAKE TUES AND WEDS LOOK SIMILAR TO TODAY
ACCORDING TO THE MODELS. MOVING BEYOND MID WEEK...MID TO LONG RANGE
MODELS SHOW THE RIDGE INTENSIFYING WITH THE HIGH CENTER NORTH OF THE
FOUR CORNERS. THIS WOULD TAKE IT OUT OF THE PRIME REAL ESTATE FOR
BRINGING MOISTURE INTO SE AZ WHICH WOULD VALIDATE THE INHERITED LOW
RANGE MONSOON POPS. WILL WAIT AND SEE WHAT THE 12Z RUN OFFERS...BUT
CAN SEE NO REASON TO ARGUE.

ONE LAST THING TO MENTION...WITH THE RIDGE REMAINING IN PLACE...AND
EVEN INTENSIFYING...AFTERNOON HIGH TEMPERATURES ARE EXPECTED TO
REMAIN ABOVE CLIMATOLOGICAL NORMALS AND SHOW LITTLE VARIANCE FROM
DAY TO DAY. THIS WOULD KEEP THE TUCSON METRO OVER THE CENTURY MARK
FOR THE ENTIRE FORECAST PERIOD...PUSHING THE WESTERN DESERTS TO
CLOSER TO 110 AND EASTERN VALLEYS TO THE UPPER 90S.

INHERITED FORECAST APPEARS TO BE ON TRACK. EXPECT TO MAKE SOME
SLIGHT TWEAKS TO TAKE INTO ACCOUNT CURRENT OBS AND NEWEST MODEL
DATA...BUT OTHERWISE NO SIGNIFICANT CHANGES EXPECTED.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...NONE.

WEATHER.GOV/TUCSON

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
857 AM MST MON JUL 20 2009

AZZ019-030-034-035-211200-
NORTHERN GREENLEE COUNTY-UPPER GILA RIVER VALLEY-
SANTA CRUZ COUNTY-COCHISE COUNTY-
857 AM MST MON JUL 20 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
ARIZONA.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP THIS AFTERNOON AND CONTINUE INTO THIS EVENING. THE
STRONGEST STORMS MAY PRODUCE BRIEF HEAVY RAIN AND WIND GUSTS UP TO
45 MPH. THE BULK OF THE ACTIVITY IS FORECAST TO END BY AROUND
MIDNIGHT TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE DAILY CYCLE OF ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS
IS EXPECTED TO CONTINUE THROUGH SUNDAY...WITH ACTIVITY EXPECTED TO
DEVELOP DURING THE AFTERNOON AND CONTINUE INTO THE EVENING HOURS.

.SPOTTER INFORMATION STATEMENT...

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

AZZ029-031>033-211200-
SOUTHEAST PINAL COUNTY-WESTERN PIMA COUNTY-TOHONO OODHAM NATION-
TUCSON METRO/MARANA/GREEN VALLEY-
857 AM MST MON JUL 20 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARIZONA AND SOUTHEAST ARIZONA.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP ACROSS THE AREA THIS AFTERNOON INTO THIS EVENING. THE
STRONGEST STORMS MAY PRODUCE BRIEF PERIODS OF HEAVY RAIN...WIND
GUSTS UP TO 45 MPH AND REDUCED VISIBILITIES DUE TO BLOWING DUST.
THE MAJORITY OF ACTIVITY IS EXPECTED TO END BY MIDNIGHT TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE DAILY CYCLE OF ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS
IS EXPECTED TO CONTINUE THROUGH WEDNESDAY BEFORE BECOMING MORE
ISOLATED FOR THE REMAINDER OF THE WEEK. ACTIVITY IS EXPECTED TO
DEVELOP DURING THE AFTERNOON AND CONTINUE INTO THE EVENING HOURS.

.SPOTTER INFORMATION STATEMENT...

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

WEATHER.GOV/TUCSON