Alert archive / Arizona / Special Weather Statements in 2016

Special Weather Statement, NWS Phoenix, AZ

July 1, 2016Maricopa County, Arizona

NWS Phoenix, AZ issued this special weather statement at Jul 1, 2016, 8:31 PM MST for Maricopa County, Arizona. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 1, 2016, 8:31 PM MST (03:31 UTC)
Expired: Jul 1, 2016, 9:15 PM MST
In force: 44 min
Issued by: NWS Phoenix, AZ

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 127 km from the middle of the area, began a volume at 03:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 3.5 hours before the alert went out and 106 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 793 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1624 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this special weather statement went out at Jul 1, 1:45 PM MST, 6 hours 46 minutes earlier.

Area forecast discussion, Jul 1, 1:45 PM MST, 6 hours 46 minutes before

Area Forecast Discussion
National Weather Service Phoenix AZ
145 PM MST FRI JUL 1 2016

&&

.SYNOPSIS...
A combination of lingering monsoon moisture and weak weather
disturbances moving eastward across the desert southwest will bring
chances for showers and thunderstorms tonight across sw and south-
central Arizona, and on Saturday, over the higher terrain of eastern
Arizona. A return to drier southwest flow aloft will begin to take
over starting Saturday and end any rain chances starting Sunday.
High temperatures will steadily climb into the weekend and early
next week as the atmosphere becomes drier. The dry and warm
conditions will likely last through much of next week.

&&

.DISCUSSION...

.late this afternoon/tonight....

A bit of a break in action across our cwa this hour, with the shower
and thunderstorm activity that affected parts of South-Central AZ
this morning having moved well off to the south and east, now
extending northward from eastern Pima/Cochise counties to eastern
Gila County. The shower activity this morning is currently holding
down temperatures a bit over South-Central AZ, with Phoenix Sky
Harbor airport only up to 90 degrees at noon, under clear skies.
Further to the west, over western Maricopa and La Paz/Yuma counties,
fields of CU can be seen developing on latest visible satellite
imagery, over areas that stayed dry this morning, allowing
temperatures to rise well up into the 90s at midday. Surface
dewpoints remain elevated at most lower desert locations, well up
into the 60s to near 70. Up to the north, new thunderstorms can be
seen on radar developing over Yavapai County.

As far as the forecast for this afternoon/evening is concerned, in
spite of normally unfavorable westerly flow that is developing over
the region as an upper trof approaches the CA coast, the combination
of lingering low-level moisture and another shortwave approaching
from the northwest will likely produce another round of convective
activity across South-Central and SW AZ later this
afternoon/evening. Today's situation appears to be more like a
transition event rather then a classic monsoon case, with the GFS
forecast soundings showing 1500-2000 J/KG of CAPE (with little or no
CIN), and 25-30 knots of bulk shear over the region through this
evening. The 12Z WRFGFS, which did a good job with this morning's
convective activity, is showing shower/thunderstorm development
later this afternoon across northern La Paz and NW Maricopa
Counties, with this activity moving into the Greater Phoenix area
this evening as the shortwave trigger moves eastward across northern
AZ. Given all this available convective energy and intrusion of
drier air above 600mb, a few of the storms could become severe, with
very strong downburst winds, heavy downpours, localized flooding,
and even small hail possible. Thus, have raised POPS this evening
well up into the chance range across the lower deserts of South-
Central AZ, and into the likely range over southern Gila County.

.Saturday through next Friday...

This weekend will bring a continued drying westerly flow, but enough
lingering low level moisture should exist for some isolated eastern
Arizona high terrain afternoon showers and thunderstorms. The
possibility of any activity over the lower deserts is pretty slim
due to the westerly steering flow and PWATS dropping down to around
1.25 inches. By Sunday, enough dry air should be in place for there
to be little chance of any storms even over the high terrain.
Temperatures this weekend will be on the upswing with the drier
conditions and clear to mostly clear skies as highs climb back toward
normal readings.

Next week looks to be mostly quiet as far as any storm potential as
the upper high center generally stays to our southeast providing us
with westerly or southwesterly flow. Temperatures should peak by
Tuesday or Wednesday with some lower desert spots reaching 110F for
highs. 500mb heights do climb to around 592dm and 850mb temperatures
near 30C, but at this point it does not appear enough to hit
excessive heat levels. There is potential for a return of some
monsoonal moisture as early as Wednesday, but the past few model
runs are showing this to be a very brief episode with more dry air
quickly moving in by the end of the week. At least for now slight
chance PoPs over the high terrain for Thursday and Friday seem
warranted.

&&

.AVIATION...
South-Central Arizona Including KPHX, KIWA, and KSDL:
Southeasterly flow will veer to southwesterly during the afternoon,
but wind speeds will generally remain at or below 10 kt. Meanwhile, latest
convective guidance is pointing towards an increased potential for
showers and thunderstorms across the Phoenix area later this
evening. Any storms that develop will be capable of producing strong
gusty winds and brief heavy rain. Model consensus is that the most
likely wind shift associated with the storms will be from the
northwest. Improving conditions are anticipated after 09z.

Southeast California/Southwest Arizona including KIPL and KBLH:
The active weather will generally remain east of KIPL, but may clip
KBLH this afternoon. Thunderstorms are generally not expected,
however strong storms across western AZ may produce a wind shift out
of the north or east at KBLH this evening. Otherwise, mostly clear
skies are expected with a southerly component to the flow prevailing
through early Saturday.

Aviation discussion not updated for amended TAFs.

&&

.FIRE WEATHER...
Monday through Friday: The monsoon high will rebuild across
southeastern Arizona Monday, resulting in above normal temperatures
and generally dry conditions. An increase in moisture is expected
Wednesday as the high shifts eastward. Drier westerly flow across
southeastern California will battle deeper moisture across
southeastern Arizona through the remainder of the week, with showers
and thunderstorms mainly relegated to southern and eastern Arizona.
Near normal temperatures are expected mid to late week.

&&

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected.

&&

.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...None.
CA...None.
&&

Visit us on Facebook...Twitter...and at weather.gov/phoenix

DISCUSSION...Percha/Kuhlman
AVIATION...Hirsch
FIRE WEATHER...Hirsch

In the hours before

Special weather statement, Jul 1, 8:02 PM MST, 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
802 PM MST FRI JUL 1 2016

AZZ022-026>028-020330-
NORTHWEST MARICOPA COUNTY AZ-
NORTHWEST AND NORTH CENTRAL PINAL COUNTY AZ-SOUTHWEST DESERTS AZ-
SOUTHWEST MARICOPA COUNTY AZ-
802 PM MST FRI JUL 1 2016

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHWESTERN MARICOPA...SOUTHWESTERN PINAL AND EAST CENTRAL YUMA
  COUNTIES

UNTIL 830 PM MST

AT 801 PM MST...DOPPLER RADAR WAS TRACKING A CLUSTER OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR ESTRELLA SAILPORT TO
17 MILES NORTH OF AJO...AND MOVING SOUTHEAST AT 20 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
BUCKEYE...GILA BEND...ESTRELLA...BIG HORN...
GILA BEND AUXILIARY FIELD...FREEMAN...SENTINEL...COTTON CENTER...
SUNDAD...BOSQUE...SONORAN NATIONAL MONUMENT...PAINTED ROCK DAM...
HYDER...STANFIELD...MOBILE AND AK-CHIN VILLAGE.

LAT...LON 3306 11368 3346 11312 3293 11183 3272 11212
      3272 11214 3268 11217 3268 11220 3265 11220
      3250 11241 3251 11264
TIME...MOT...LOC 0301Z 294DEG 18KT 3303 11221 3264 11286

HERNANDEZ

Special weather statement, Jul 1, 8:03 PM MST, 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
803 PM MST FRI JUL 1 2016

AZZ021-020330-
WEST CENTRAL DESERTS AZ-
803 PM MST FRI JUL 1 2016

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL LA PAZ COUNTY

UNTIL 830 PM MST

AT 803 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
OVER BRENDA...OR 35 MILES SOUTHEAST OF PARKER...MOVING SOUTHEAST AT
15 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
QUARTZSITE...BRENDA AND VICKSBURG JUNCTION.

LAT...LON 3369 11419 3384 11411 3372 11365 3347 11381
TIME...MOT...LOC 0303Z 293DEG 12KT 3368 11397

HERNANDEZ

Local storm report, Jul 1, 8:08 PM MST, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
808 PM MST FRI JUL 1 2016

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

0715 PM     NON-TSTM WND DMG 3 E AHWATUKEE FOOTHILLS 33.31N 112.00W
07/01/2016                   MARICOPA           AZ   TRAINED SPOTTER

            1 FT DIAMETER PALO VERDE TREE UPROOTED.

&&

AD

Local storm report, Jul 1, 8:29 PM MST, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
829 PM MST FRI JUL 1 2016

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

0700 PM     DUST STORM       11 N GILA BEND          33.10N 112.71W
07/01/2016                   MARICOPA           AZ   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED ZERO VISIBILITY. .

&&

AD

Local storm report, Jul 1, 8:30 PM MST, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
830 PM MST FRI JUL 1 2016

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

0730 PM     HEAVY RAIN       11 N GILA BEND          33.10N 112.71W
07/01/2016  M1.44 INCH       MARICOPA           AZ   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED 1.44 INCHES OF RAIN
            WITHIN 30 MINUTES. .

&&

AD

Special weather statement, Jul 1, 8:31 PM MST, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
831 PM MST FRI JUL 1 2016

AZZ021-022-026>028-020415-
NORTHWEST MARICOPA COUNTY AZ-
NORTHWEST AND NORTH CENTRAL PINAL COUNTY AZ-WEST CENTRAL DESERTS AZ-
SOUTHWEST DESERTS AZ-SOUTHWEST MARICOPA COUNTY AZ-
831 PM MST FRI JUL 1 2016

...SPECIAL WEATHER STATEMENT...

AT 831 PM MST...DOPPLER RADAR WAS TRACKING A CLUSTER OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR PALO VERDE NUCLEAR
GENERATION STATION TO 6 MILES NORTHEAST OF SENTINEL...AND MOVING
SOUTHEAST AT 15 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
BUCKEYE...GILA BEND...ESTRELLA...BIG HORN...
GILA BEND AUXILIARY FIELD...FREEMAN...SENTINEL...COTTON CENTER...
SUNDAD...PALO VERDE NUCLEAR GENERATION STATION...BOSQUE...
SONORAN NATIONAL MONUMENT...PAINTED ROCK DAM...HYDER AND MOBILE.

LAT...LON 3322 11384 3365 11328 3291 11197 3250 11235
      3250 11266
TIME...MOT...LOC 0331Z 306DEG 14KT 3332 11287 3296 11318

HERNANDEZ

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 5:02 PM MST	Special Weather Statement	PSR	Maricopa	28 min
Jul 1, 5:07 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Jul 1, 5:19 PM MST	Areal Flood Advisory	PSR	Maricopa	116 min
Jul 1, 5:28 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	32 min
Jul 1, 5:36 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Jul 1, 5:53 PM MST	Special Weather Statement	PSR	Maricopa	52 min
Jul 1, 6:00 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	30 min
Jul 1, 6:05 PM MST	Tornado Warning	PSR	Maricopa	25 min
Jul 1, 6:31 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	44 min
Jul 1, 6:52 PM MST	Areal Flood Advisory	PSR	Maricopa	113 min
Jul 1, 7:16 PM MST	Special Weather Statement	PSR		44 min
Jul 1, 7:17 PM MST	Dust Storm Warning	PSR		103 min
Jul 1, 8:02 PM MST	Special Weather Statement	PSR	Maricopa	28 min
Jul 1, 8:03 PM MST	Special Weather Statement	PSR	La Paz	27 min
Jul 1, 8:15 PM MST	Severe Thunderstorm Warning	PSR	La Paz	45 min
Jul 1, 8:42 PM MST	Areal Flood Advisory	PSR	La Paz	2 hr
Jul 1, 8:52 PM MST	Flash Flood Warning	PSR	La Paz	113 min
Jul 1, 9:35 PM MST	Special Weather Statement	PSR		40 min
Jul 1, 10:17 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 1, 10:56 PM MST	Areal Flood Warning	PSR	La Paz	3 hr
Jul 2, 1:44 AM MST	Special Weather Statement	PSR		31 min
Jul 2, 2:23 AM MST	Special Weather Statement	PSR	Gila	52 min
Jul 2, 5:12 AM MST	Areal Flood Advisory	PSR	Gila	3 hr
Jul 2, 8:02 AM MST	Areal Flood Advisory	PSR	Gila	3 hr

Nearby

Special Weather Statements in Arizona, 2016 Every special weather statement in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.