Severe Thunderstorm Warning 113, NWS Tucson, AZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
845 AM MST TUE OCT 6 2015

.SYNOPSIS...AN UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE INTO THE
STATE TODAY AND BRING A BETTER CHANCE OF SHOWERS AND THUNDERSTORMS
TO THE AREA. CONDITIONS ARE FAVORABLE FOR STRONG STORMS. IN
ADDITION...EXPECT THE COOLING TREND TO CONTINUE WITH GUSTY WINDS AT
TIMES. A FEW SHOWERS STILL POSSIBLE NEAR THE MOUNTAINS WITH A SLOW
WARMING TREND LATE IN THE WEEK.

&&

.DISCUSSION...THE LOW WE'VE BEEN STARING AT THE PAST SEVERAL DAYS IS
NOW IN WESTERN ARIZONA ON A TRACK FOR SOUTHEAST ARIZONA OVER THE
NEXT 24 HOURS. THE 12Z KTWC SOUNDING SHOWED ADDITIONAL DRYING
BETWEEN 600-700HPA AS EXPECTED...BUT THE MID LEVEL DRY SLOT IS NOW
SHIFTING EAST OF THE AREA. PRECIPITABLE WATER VALUES AROUND 1 INCH
ARE NOW PUSHING IN FROM THE WEST ON THE SOUTHEAST FLANK OF THE LOW.
TWO SPOKES OF ENERGY ARE NOTABLE ON WATER VAPOR IMAGERY SHIFTING
ACROSS CENTRAL AND SOUTHERN ARIZONA THIS MORNING...WITH THE FIRST
WEAKER ONE PUSHING THROUGH WESTERN PIMA COUNTY...AND A SECOND
STRONGER ONE THROUGH YUMA COUNTY ATTM. WE'LL ADD IN SOME DECENT
SHEAR (BUT NOT AS STRONG AS YESTERDAY)...AND A LITTLE SOLAR
INSOLATION TO FIRE SOME STORMS THROUGH CENTRAL AND EASTERN PIMA
COUNTY BETWEEN NOON AND 3 PM. IT SHOULD BE NOTED HOWEVER THAT THE
BEST SHEAR AND CONVECTIVE POTENTIAL FOR STRONGER STORMS NOW LOOKS
LIKE IT'S COMING TOGETHER NORTH OF TUCSON...INCLUDING PORTIONS OF
PINAL...GRAHAM AND GREENLEE COUNTIES.

PLEASE SEE THE PREVIOUS DISCUSSION BELOW FOR ADDITIONAL DETAILS.

&&

.AVIATION...VALID THRU 07/16Z.
SCT TO LOCALLY BKN-OVC CLOUDS 6-10 KFT WITH ISOLD -SHRA AND THEN
SCTD -SHRA/TS AFTER 06/18Z AREA-WIDE. GUSTY WINDS PSBL AGAIN AFTER
18Z ESPECIALLY SOUTH AND EAST OF KTUS. BRIEF MVFR CONDITIONS ARE
POSSIBLE WITH TSRA AS WELL. AVIATION DISCUSSION NOT UPDATED FOR TAF
AMENDMENTS.

&&

.FIRE WEATHER...AN AREA OF LOW PRESSURE WILL BE IMPACTING SOUTHEAST
ARIZONA THROUGH MUCH OF THE COMING WEEK. THIS SYSTEM WILL BRING
INCREASED MOISTURE WITH A CHANCE OF SHOWERS AND THUNDERSTORMS
THROUGH WEDNESDAY. A FEW STORMS COULD BE STRONG THIS AFTERNOON.
OTHERWISE...EXPECT BREEZY SOUTHERLY WINDS AGAIN TODAY ESPECIALLY
EAST OF TUCSON WITH LIGHT WINDS THE REMAINDER OF THE WEEK.
TEMPERATURES WILL REMAIN COOL WITH HIGHS BELOW NORMAL THROUGH
MIDWEEK...THEN MODERATING LATER THIS WEEK.

&&

.PREV DISCUSSION...LOW FILLING A BIT BUT STILL HAS SOME PUNCH AS IT
PUSHES SLOWLY INTO WESTERN ARIZONA EARLY THIS MORNING. PRECIPITABLE
WATER STILL A LITTLE MARGINAL WITH SOME DRYING ABOVE H7...BUT
PICKING UP AGAIN A LITTLE FURTHER WEST WRAPPING INTO THE BASE OF THE
LOW WITH 1 INCH VALUES AVAILABLE THERE. THE HRRR IS PICKING UP ON AN
ENHANCED SPOKE OF ENERGY FROM THE BASE OF THE LOW INTO THE SOUTHEAST
QUADRANT. THE BEST CONVECTIVE POTENTIAL THIS MORNING IS FORMING
INITIALLY THROUGH CENTRAL PIMA COUNTY INTO PINAL COUNTY BUT IN A
MODEST SHEAR REGION. THE MID DAY TO EARLY AFTERNOON PERIOD SEES THIS
AREA OF CONVECTIVE POTENTIAL COME TOGETHER WITH A NICE SHEAR REGIME
THROUGH EASTERN PIMA COUNTY FOR ENHANCED THUNDERSTORM CHANCES FOR
TUCSON METRO. BY EARLY TO MID AFTERNOON THE FAVORED STRONG
THUNDERSTORM AREA LIFTS NORTHEAST INTO EASTERN PINAL AND GRAHAM
COUNTIES. HAIL AND STRONG WINDS A THREAT ALONG WITH LOCALLY HEAVY
RAIN. HOWEVER...STORM MOTION WILL BE ON THE BRISK SIDE SO WE WOULD
NEED SOME TRAINING TO SEE ANY FLOOD THREATS. MOST LIKELY TRAINING
AREAS WOULD PROBABLY BE SOUTHWESTERN AND SOUTHERN SLOPES NEAR
MOUNTAINS (POSSIBLY INCLUDING CATALINA FOOTHILLS).

INFLUENCES OF THE LOW WILL CONTINUE WEDNESDAY WITH A CHANCE OF
SHOWERS AND THUNDERSTORMS PRIMARILY EAST OF TUCSON AS IT WOBBLES
THROUGH.

ACTUALLY...THIS LOW IS GOING TO FINALLY LOSE ANY LAST VESTIGES OF
HIGHER LATITUDE SUPPORT LATER TODAY AND WILL THEN RESPOND TO MEAN
FLOW INFLUENCES BELOW 40N...WHICH MEANS IT WILL CONTINUE TO SLOWLY
FILL AND SAG DOWN THE FRONT SIDE OF THE DEVELOPING RIDGE NEAR THE
WEST COAST OVER THE NEXT 72 HOURS. THEN RETROGRADE ACROSS NORTHWEST
MEXICO UNDER THE RIDGE FRIDAY INTO THE WEEKEND. AS A MATTER OF FACT
IT'S VERY LIKELY WE WILL STILL BE TALKING ABOUT THIS LOW INFLUENCING
OUR WEATHER NEXT WEEK AS IT TRIES TO COME BY FOR ANOTHER PASS FROM
THE WEST.

WITH THIS IN MIND WE WILL CONTINUE TO GO WITH A GENERAL WARMING
TREND LATE IN THE WEEK AS WELL AS A RELATIVE DRYING TREND.
HOWEVER...WE WILL KEEP A FEW SHOWERS AROUND SOME MOUNTAIN AND
INTERNATIONAL BORDER AREAS AS THE LOW REMAINS IN OUR GENERAL
VICINITY.

&&

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

&&

VISIT US ON FACEBOOK...TWITTER...YOUTUBE...AND AT WEATHER.GOV/TUCSON

MEYER

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1036 AM MST TUE OCT 6 2015

AZZ508-512-061800-
EASTERN COCHISE COUNTY BELOW 5000 FEET INCLUDING DOUGLAS/WILLCOX AZ-
CHIRICAHUA MOUNTAINS INCLUDING CHIRICAHUA NATIONAL MONUMENT AZ-
1036 AM MST TUE OCT 6 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN COCHISE COUNTY UNTIL
1100 AM MST...

AT 1034 AM MST...TRAINED WEATHER SPOTTERS REPORTED A STRONG
THUNDERSTORM 7 MILES NORTHEAST OF DOUGLAS...MOVING NORTHEAST AT 35
MPH. NICKEL SIZE HAIL WAS REPORTED IN DOUGLAS.

DIME TO NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
DOUGLAS AND RURAL COCHISE COUNTY NORTHEAST OF DOUGLAS

LAT...LON 3134 10958 3157 10946 3159 10919 3134 10936
TIME...MOT...LOC 1734Z 212DEG 32KT 3142 10946

KD

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
1040 AM MST TUE OCT 06 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1031 AM     HAIL             1 ENE DOUGLAS           31.35N 109.52W
10/06/2015  E0.88 INCH       COCHISE            AZ   TRAINED SPOTTER

&&

EVENT NUMBER TWC1500099

KD

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1055 AM MST TUE OCT 6 2015

AZZ509>511-061900-
UPPER GILA RIVER AND ARAVAIPA VALLEYS INCLUDING CLIFTON/SAFFORD AZ-
WHITE MOUNTAINS OF GRAHAM AND GREENLEE COUNTIES INCLUDING HANNAGAN
MEADOW AZ-GALIURO AND PINALENO MOUNTAINS INCLUDING MOUNT GRAHAM AZ-
1055 AM MST TUE OCT 6 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GRAHAM AND SOUTHERN
GREENLEE COUNTIES UNTIL NOON MST...

AT 1054 AM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8
MILES SOUTHEAST OF SOLOMON...MOVING NORTHEAST AT 25 MPH. IN
ADDITION...NUMEROUS OTHER THUNDERSTORMS ARE OCCURRING ACROSS
SOUTHEASTERN GRAHAM AND SOUTHERN GREENLEE COUNTIES.

PENNY SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SAFFORD...CLIFTON...MORENCI...THATCHER...PIMA...DUNCAN...FRANKLIN...
GUTHRIE...JUNCTION OF HIGHWAYS 191 AND 266...FRYE MESA DAM...
SOLOMON...MOUNT GRAHAM AND SWIFT TRAIL JUNCTION.

LAT...LON 3244 10907 3244 10991 3296 10996 3317 10952
      3310 10906
TIME...MOT...LOC 1754Z 219DEG 20KT 3275 10951

GL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1143 AM MST TUE OCT 6 2015

AZZ504>506-061930-
SOUTH CENTRAL PINAL COUNTY INCLUDING ELOY/PICACHO PEAK STATE PARK AZ-
TUCSON METRO AREA INCLUDING TUCSON/GREEN VALLEY/MARANA/VAIL AZ-
SOUTHEAST PINAL COUNTY INCLUDING KEARNY/MAMMOTH/ORACLE AZ-
1143 AM MST TUE OCT 6 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PINAL AND
NORTHEASTERN PIMA COUNTIES UNTIL 1230 PM MST...

AT 1142 AM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR RED ROCK...MOVING NORTHEAST AT 30 MPH.

PENNY SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
MARANA...ELOY...AVRA VALLEY...FRIENDLY CORNERS...PICACHO...RED ROCK
AND PICACHO PEAK.

LAT...LON 3266 11082 3241 11131 3267 11175 3275 11165
      3276 11161 3284 11153 3296 11137
TIME...MOT...LOC 1842Z 214DEG 27KT 3253 11124

GL