November 9, 2008 Storm Statistics

Readings From Weather Bus.com:

First Rain Time: Novmeber 9, 2008 at 3:30pm
Last Rain Time: Novmeber 9, 2008 at 4:15pm
Storm Total: Trace
Peak Wind Gust: W @ 28mph @ 4:40pm
Total Lightning: 15,654

Comments:
A trough of low pressure moved into the region during the afternoon/evening hours on November 9th, which brought very strong upper level dynamics into the area, which included strong winds aloft (vertical shear), strong divergence aloft (good uplift), rather cold air aloft (lowers freezing temperature to help produce hail and allows for additional instability). Coupled with this trough of low pressure was a cold front, which moved through the area during the afternoon hours, which provided even more uplift. All of this, combined with added moisture, resulted in a number of strong to severe thunderstorms to develop across the valley. Some of these storms, produce small to large hail which accumulated in some location, as can be seen in the photo to the right.

The only potential issue with getting thunderstorms to form was moisture, but this was overcome by a thin band of low level moisture which moved into the area from the south just ahead and along the front. The moisture increase could be seen by looking at the dew point data/graph for the day. The dew point went from 15°F at noon to nearly 47°F by 4:15pm. After the front passed the dew point dropped back down into the 20's and 30's. This added low level moisture ahead/along the front was enough to allow strong to severe thunderstorms to rapidly develop, producing moderate to heavy rainfall, accumulating hail, strong winds and lightning.

Thunderstorms first developed across portions of the west valley, with hail estimated to be 0.88in in diameter reported in Glendale and hail estimated to be 0.75in in Peoria, around 2:40pm. As the front continued to move across the valley, additional thunderstorms developed across portions of the southeast valley, which then moved into the Gold Canyon area by 3:30pm. The storms which moved through (mainly eastern portions of Gold Canyon) brought heavy rainfall, hail (see photo above), wind and lightning. Examining the radar data, the two main cells that impacted the area moved almost directly down or just to the west of Peralta Trail (see radar loops below zoomed into Gold Canyon).

Base Ref. Loop
3:22 - 3:45pm
Click Image To Enlarge
Hail Chance Loop
3:22 - 3:45pm
Click Image To Enlarge
Base Ref. Loop
3:49 - 4:08pm
Click Image To Enlarge
>
Hail Chance Loop
3:49 - 4:08pm
Click Image To Enlarge


Our locations only received a trace amount of rainfall, however reports of much heavier rainfall were received, which include:
Location: NW Gold Canyon
Report Time: 10th of November 2008 12:11 PM EST
Reporter: Al R.
Rain Total: 0.11in.

Location: Peralta Trails
Report Time: 9th of November 2008 06:35 PM EST
Reporter: Barbara Walker
Rain Total: 0.65in.
Comments: Heavy rain--we missed it. Came home with pea-sized hail all over. The rain gauge was tilted, so it may have been more than measured.

(The above rain totals were reported to us by the public. The accuracy of these reports is unknown.)


Below are the storm reports received by the National Weather Service in Phoenix:

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ


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

0240 PM     HAIL             GLENDALE                33.58N 112.20W
11/09/2008  E0.88 INCH       MARICOPA           AZ   TRAINED SPOTTER

            NEAR THE LOOP 101 AND UNION HILLS.


0242 PM     HAIL             PEORIA                  33.69N 112.24W
11/09/2008  E0.75 INCH       MARICOPA           AZ   TRAINED SPOTTER

            NEAR 89TH AVE AND GREENWAY.


0339 PM     HAIL             CHANDLER                33.29N 111.87W
11/09/2008  E0.25 INCH       MARICOPA           AZ   NWS EMPLOYEE

            SOUTH CHANDLER.


0400 PM     TSTM WND DMG     ARIZONA CITY            32.75N 111.67W
11/09/2008                   PINAL              AZ   CO-OP OBSERVER

            SEVERAL LARGE CACTUS PLANTS, 20-30FT TALL PRICKLY PEAR,
            BLOWN DOWN.


0449 PM     HAIL             ARIZONA CITY            32.75N 111.67W
11/09/2008  E0.25 INCH       PINAL              AZ   TRAINED SPOTTER


0500 PM     HAIL             ARIZONA CITY            32.75N 111.67W
11/09/2008  E0.75 INCH       PINAL              AZ   CO-OP OBSERVER




Rainfall Totals Released From The NWS:

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1200 AM MST MON NOV 10 2008

...24 HOUR PRECIPITATION FOR THE PHOENIX METRO AREA ENDING
AT 12 MIDNIGHT...

NOTE...IF IT RAINED AT A LOCATION...THE AMOUNT WILL BE SHOWN
ONLY IF IT IS AT LEAST 0.04...4 HUNDREDTHS OF AN INCH. ANY RAIN
AMOUNT LESS THAN 0.04 IS NOT REGISTERED AND IS SHOWN AS 0.00

                               6 HR PRECIPITATION (INCHES)
                               OLDEST  >>>>>>>>>>>  NEWEST
  ID     STATION NAME           MDNT   6 AM   NOON   6 PM   24 HR
                               -6 AM  -NOON  -6 PM  -MDNT   TOTAL


AHWATUKEE
MAHA3    AHWATUKEE              0.00   0.00   0.00   0.00    0.00
APACHE JUNCTION
PMDA3    USERY MOUNTAIN PARK    0.00   0.00   0.00   0.00    0.00
KNGA3    KINGS RANCH            0.00   0.00   0.04   0.00    0.04
AVONDALE
AVOA3    AGUA FRIA @ BUCKEYE    0.00   0.00   0.00   0.00    0.00
BUCKEYE
MBUA3    BUCKEYE FRS #2         0.00   0.00   0.00   0.00    0.00
CAREFREE
ZCAA3    FRAESFIELD MOUNTAIN    0.00   0.00   0.00   0.00    0.00
CRFA3    CAREFREE RANCH         0.00   0.00   0.00   0.00    0.00
CAVECREEK
HMBA3    HUMBOLDT MOUNTAIN      0.00   0.00   0.00   0.00    0.00
CBTA3    CAVE BUTTES DAM        0.00   0.00   0.00   0.00    0.00
CHANDLER
ZCHA3    EMF @ ARIZONA AVE      0.00   0.00   0.00   0.00    0.00
GILBERT
ZGIA3    MESA TOWER             0.00   0.00   0.00   0.00    0.00
ZCPA3    CROSSROADS PARK        0.00   0.00   0.00   0.00    0.00
GLENDALE
MGLA3    CITY OF GLENDALE       0.00   0.00   0.00   0.00    0.00
MMDA3    MARYLAND @ 27TH AVE    0.00   0.00   0.00   0.00    0.00
MSXA3    ACDC @ 67TH AVE        0.00   0.00   0.04   0.00    0.04
GOODYEAR
ZGYA3    TUTHILL @ RAY RD       0.00   0.00   0.00   0.00    0.00
GUADALUPE
ZGAA3    GUADALUPE FRS          0.00   0.00   0.00   0.00    0.00
MESA
MBDA3    BROADWAY @ DOBSON        M      M      M      M       M
ZBLA3    BROADWAY @ LINDSAY       M      M      M      M       M
MBHA3    BROWN RD. @ HORNE        M    0.00   0.00   0.00    0.00
MEEA3    KLEINMAN PARK          0.00   0.00   0.00   0.00    0.00
FALA3    THUNDER MOUNTAIN       0.00   0.00   0.00   0.00    0.00
MLAA3    MOUNTAIN VIEW PARK     0.00   0.00   0.00   0.00    0.00
WMSA3    QUEEN CREEK RD         0.00   0.00   0.00   0.00    0.00
ZUPA3    USERY PARK WS          0.00   0.00   0.00   0.00    0.00
NEW RIVER
NEWA3    SUNUP RANCH            0.00   0.00   0.00   0.00    0.00
PARADISE VALLEY
MCLA3    CAVE CREEK LANDFILL    0.00   0.00   0.00   0.00    0.00
MCCA3    E FORK CC #1           0.00   0.00   0.00   0.00    0.00
MLDA3    LOST DOG WASH          0.00   0.00   0.00   0.00    0.00
MRPA3    REATA PASS DAMSITE     0.00   0.00   0.00   0.00    0.00
PEORIA
NRDA3    NEW RIVER DAM            M      M      M      M       M
MBLA3    NEW RIVER @ BELL RD    0.00   0.00   0.16   0.00    0.16
PHOENIX
MBTA3    CESAR CHAVEZ PARK      0.00   0.00   0.00   0.00    0.00
MMIA3    MISSOURI @ 16TH ST     0.00   0.00   0.00   0.00    0.00
MOXA3    OLD XCUT @ MCDOWELL    0.00   0.00   0.00   0.00    0.00
MPAA3    PAPAGO PARK            0.00   0.00   0.00   0.00    0.00
MPPA3    PERRY PARK             0.00   0.00   0.00   0.00    0.00
ADBA3    ADOBE DAM              0.00   0.00   0.00   0.12    0.12
MPHA3    SKUNK CREEK @ I-17     0.00   0.00   0.00   0.00    0.00
MPMA3    JEFFERSON @ 4TH AVE    0.00   0.00   0.00   0.00    0.00
MROA3    ROESER @ 2ND ST        0.00   0.00   0.00   0.00    0.00
SOMA3    SOUTH MOUNTAIN         0.00   0.00   0.00   0.00    0.00
ZSFA3    SOUTH MOUNTAIN FAN     0.00   0.00   0.00   0.00    0.00
MTHA3    THOMAS & 16TH ST       0.00   0.00   0.00   0.00    0.00
MTQA3    THOMAS @ 48TH ST       0.00   0.00   0.00   0.00    0.00
QUEEN CREEK
ZQRA3    QUEEN CR @ RITTENHO    0.00   0.00   0.24   0.04    0.28
ZQCA3    QUEEN CREEK LANDFIL    0.00   0.00   0.00   0.00    0.00
QNCA3    EMF @ QUEEN CREEK R    0.00   0.00   0.00   0.00    0.00
SCOTTSDALE
SDLA3    INDIAN BEND WASH @     0.00   0.00   0.00   0.00    0.00
ZMDA3    MCDOWELL MOUNTAIN P    0.00   0.00   0.00   0.00    0.00
MPJA3    PIMA @ JOMAX             M    0.00   0.00   0.00    0.00
SUN CITY
MSWA3    SUN CITY WEST          0.00   0.00   0.00   0.00    0.00
SURPRISE
MDYA3    DYSART @ BELL RD       0.00   0.00   0.00   0.00    0.00
MCFA3    MCMICKEN FLOODWAY      0.00   0.00   0.00   0.00    0.00
TEMPE
MSPA3    SALT RIVER @ PRIEST    0.00   0.00   0.00   0.00    0.00
MTEA3    ASU SOUTH              0.00   0.00   0.00   0.00    0.00