Alert archive / Arizona / Special Weather Statements in 2012

Special Weather Statement, NWS Phoenix, AZ

September 4, 2012Gila County, Arizona

NWS Phoenix, AZ issued this special weather statement at Sep 4, 2012, 3:49 PM MST for Gila County, Arizona. It was in force for 26 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: Sep 4, 2012, 3:49 PM MST (22:49 UTC)
Expired: Sep 4, 2012, 4:15 PM MST
In force: 26 min
Issued by: NWS Phoenix, AZ

County Gila County, AZ

The radar

The Phoenix radar (KIWA), 123 km from the middle of the area, began a volume at 22:49 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

Tuscon, AZ (KTUS), launched 12:00Z, 10.8 hours before the alert went out and 149 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: 46 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 1563 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Sep 4, 2:45 PM MST, 1 hour 4 minutes earlier.

Area forecast discussion, Sep 4, 2:45 PM MST, 1 hour 4 minutes before

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Hazardous weather outlook, Sep 4, 5:28 AM MST, 10 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
528 AM MST TUE SEP 4 2012

AZZ021>024-026>028-051300-
WEST CENTRAL DESERTS-NORTHWEST MARICOPA COUNTY-GREATER PHOENIX AREA-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHWEST DESERTS-SOUTHWEST MARICOPA COUNTY-
NORTHWEST AND NORTH CENTRAL PINAL COUNTY-
528 AM MST TUE SEP 4 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST-CENTRAL ARIZONA...SOUTH-
CENTRAL ARIZONA...SOUTHWEST ARIZONA AND WEST-CENTRAL ARIZONA.

.DAY ONE...TODAY AND TONIGHT.

ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP DURING THE AFTERNOON HOURS AND CONTINUE INTO THE EVENING. THE
BEST THREAT FOR THUNDERSTORMS WILL BE OVER THE HIGHER TERRAIN EAST OF
PHOENIX. THE PRIMARY WEATHER HAZARDS INCLUDE GUSTY WINDS IN EXCESS OF
45 MPH...LOCALLY HEAVY RAINFALL WITH LOCALIZED FLOODING OF ROADS AND
WASHES...PATCHY DENSE BLOWING DUST AND DEADLY CLOUD TO GROUND
LIGHTNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

LOW TO MODERATE GRADE MONSOON CONDITIONS ARE EXPECTED WEDNESDAY
THROUGH THE WEEKEND WITH A GRADUAL DECREASE IN THUNDERSTORM COVERAGE
POSSIBLE SUNDAY INTO MONDAY. ISOLATED TO SCATTERED MAINLY AFTERNOON
AND EVENING THUNDERSTORMS ARE ANTICIPATED EACH DAY WITH THE BEST
CHANCES EXPECTED OVER THE HIGHER TERRAIN AREAS NORTH AND EAST OF
PHOENIX. THE PRIMARY WEATHER HAZARDS INCLUDE GUSTY WINDS IN EXCESS OF
40 MPH...LOCALLY HEAVY RAIN WITH LOCALIZED FLOODING OF STREETS AND
WASHES...PATCHY DENSE BLOWING DUST AND DEADLY CLOUD TO GROUND
LIGHTNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

AZZ020-025-CAZ030>033-051300-
LOWER COLORADO RIVER VALLEY AZ-YUMA/MARTINEZ LAKE AND VICINITY-
JOSHUA TREE NATIONAL PARK-LOWER COLORADO RIVER VALLEY CA-
RIVERSIDE COUNTY/EASTERN DESERTS-IMPERIAL COUNTY-
528 AM MST TUE SEP 4 2012 /528 AM PDT TUE SEP 4 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EXTREME SOUTHWEST
ARIZONA...EXTREME WEST-CENTRAL ARIZONA...EXTREME SOUTHEAST
CALIFORNIA AND SOUTHEAST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

EXPECT A SLIGHT CHANCE FOR MAINLY AFTERNOON AND EVENING
THUNDERSTORMS. THE MAIN WEATHER HAZARDS INCLUDE BRIEF HEAVY
RAIN...GUSTY WINDS IN EXCESS OF 40 MPH...PATCHY DENSE BLOWING DUST OR
SAND AND DEADLY CLOUD TO GROUND LIGHTNING WITH THE MORE INTENSE
STORMS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE WILL BE A SLIGHT CHANCE FOR MAINLY AFTERNOON AND EVENING
THUNDERSTORMS WEDNESDAY THROUGH FRIDAY...WITH THE THREAT DIMINISHING
SOMEWHAT FROM THE WEEKEND INTO EARLY NEXT WEEK. THE PRIMARY WEATHER
HAZARDS INCLUDE BRIEF HEAVY RAIN AND LOCALIZED FLOODING OF ROADS AND
WASHES...GUSTY WINDS IN EXCESS OF 40 MPH...PATCHY DENSE BLOWING DUST
AND SAND AND DEADLY CLOUD TO GROUND LIGHTNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

NATIONAL WEATHER SERVICE PHOENIX IS ON THE INTERNET AT

WEATHER.GOV/PHOENIX

In the hours before

Special weather statement, Sep 4, 1:45 PM MST, 2 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
145 PM MST TUE SEP 4 2012

CAZ030-042130-
RIVERSIDE CA-SAN BERNARDINO CA-
145 PM PDT TUE SEP 4 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA
  NORTH CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA

UNTIL 230 PM PDT

AT 140 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR TWENTYNINE PALMS...MOVING NORTHEAST AT 10
MPH.

WIND GUSTS OF 45 TO 55 MPH ARE EXPECTED WITH THIS STORM ALONG WITH
HEAVY RAIN AND FREQUENT LIGHTNING.

LOCATIONS IMPACTED INCLUDE...
  NORTHERN PORTIONS OF JOSHUA TREE NATIONAL PARK...
  UTAH TRAIL JTNP ENTRANCE...
  RURAL SOUTHERN SAN BERNARDINO COUNTY...
  RURAL NORTHERN RIVERSIDE COUNTY...

VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME ROADS AND
MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL SLOW DOWN TO
REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE DISTANCE BETWEEN
YOURSELF AND OTHER VEHICLES.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING. IF STORMS APPROACH
YOUR LOCATION OR YOU HEAR THUNDER...MOVE INSIDE A STURDY BUILDING OR
AN ALL METAL VEHICLE.

LAT...LON 3413 11612 3413 11606 3408 11599 3404 11598
      3405 11577 3403 11573 3388 11603 3410 11619
      3413 11613
TIME...MOT...LOC 2044Z 245DEG 9KT 3408 11605

NOLTE

Special weather statement, Sep 4, 2:31 PM MST, 1 hour 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
231 PM PDT TUE SEP 4 2012

CAZ032-042230-
RIVERSIDE CA-
231 PM PDT TUE SEP 4 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA

UNTIL 330 PM PDT

AT 227 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED AN
AREA OF STRONG THUNDERSTORMS ALONG INTERSTATE 10 NEAR DESERT CENTER...
GENERALLY MOVING TO THE EAST NORTHEAST.

LOCALLY DENSE BLOWING DUST IS POSSIBLE.

LOCATIONS IMPACTED INCLUDE...
  INTERSTATE 10 NEAR DESERT CENTER...
  RURAL CENTRAL RIVERSIDE COUNTY...

LOCALLY DENSE BLOWING DUST IS POSSIBLE. IF YOU ENCOUNTER BLOWING DUST
WHILE DRIVING...PULL OVER AS FAR OFF THE ROADWAY AS POSSIBLE AND
PARK. TURN OFF YOUR HEADLIGHTS AND KEEP YOUR FOOT OFF THE BRAKE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING. IF STORMS APPROACH
YOUR LOCATION OR YOU HEAR THUNDER...MOVE INSIDE A STURDY BUILDING OR
AN ALL METAL VEHICLE.

LAT...LON 3376 11544 3376 11507 3363 11516 3358 11527
      3351 11540 3351 11563
TIME...MOT...LOC 2131Z 243DEG 5KT 3365 11529

NOLTE

Special weather statement, Sep 4, 2:54 PM MST, 55 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
254 PM MST TUE SEP 4 2012

CAZ030-032-042300-
RIVERSIDE CA-
254 PM PDT TUE SEP 4 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA

UNTIL 400 PM PDT

AT 250 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR CHIRIACO SUMMIT...MOVING NORTHEAST AT 10
MPH.

WIND GUSTS OF 40 TO 50 MPH ARE EXPECTED WITH THIS STORM ALONG WITH
HEAVY RAINFALL.

LOCATIONS IMPACTED INCLUDE...
  CHIRIACO SUMMIT...
  INTERSTATE 10 NEAR CHIRIACO SUMMIT...
  RURAL CENTRAL RIVERSIDE COUNTY...

LOCALLY DENSE BLOWING DUST IS POSSIBLE. IF YOU ENCOUNTER BLOWING DUST
WHILE DRIVING...PULL OVER AS FAR OFF THE ROADWAY AS POSSIBLE AND
PARK. TURN OFF YOUR HEADLIGHTS AND KEEP YOUR FOOT OFF THE BRAKE.

VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME ROADS AND
MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL SLOW DOWN TO
REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE DISTANCE BETWEEN
YOURSELF AND OTHER VEHICLES.

LAT...LON 3381 11572 3376 11553 3359 11565 3363 11581
TIME...MOT...LOC 2153Z 208DEG 9KT 3368 11569

NOLTE

Special weather statement, Sep 4, 3:12 PM MST, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
312 PM MST TUE SEP 4 2012

AZZ023-024-042300-
MARICOPA AZ-
312 PM MST TUE SEP 4 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA

UNTIL 400 PM MST

AT 309 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
GUSTY WINDS FROM STORMS OVER NORTHERN MARICOPA COUNTY. THE WINDS
WILL MOVE INTO THE NORTHEAST VALLEY BEFORE 400 PM.

WIND GUSTS UP TO 40 MPH ARE EXPECTED...ALONG WITH PATCHY AREAS OF
BLOWING DUST.

LOCATIONS IMPACTED INCLUDE...
   SCOTTSDALE...
   MCDOWELL MOUNTAIN PARK...

SOME UNSECURED OBJECTS COULD BE BLOWN AROUND. SEEK SHELTER INDOORS
UNTIL THE WINDS DECREASE.

LAT...LON 3353 11132 3347 11161 3354 11212 3378 11232
      3377 11167 3383 11143
TIME...MOT...LOC 2210Z 335DEG 2KT 3373 11182

WOODALL

Special weather statement, Sep 4, 3:33 PM MST, 16 minutes before

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Special weather statement, Sep 4, 3:49 PM MST, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
349 PM MST TUE SEP 4 2012

AZZ024-042315-
GILA AZ-
349 PM MST TUE SEP 4 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTH CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA

UNTIL 415 PM MST

AT 348 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 8 MILES NORTH OF SAN CARLOS...MOVING SOUTHEAST AT
10 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

LOCATIONS IMPACTED INCLUDE...
   SAN CARLOS...

SOME UNSECURED OBJECTS WILL BE BLOWN AROUND...TREE LIMBS COULD BE
SNAPPED OFF...AND ISOLATED POWER OUTAGES WILL BE POSSIBLE. SEEK
SHELTER INDOORS UNTIL THE STORM PASSES.

VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME ROADS AND
MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL SLOW DOWN TO
REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE DISTANCE BETWEEN
YOURSELF AND OTHER VEHICLES.

LAT...LON 3343 11021 3343 11028 3343 11029 3343 11032
      3340 11035 3340 11041 3337 11044 3332 11044
      3345 11060 3359 11047 3344 11020
TIME...MOT...LOC 2249Z 309DEG 8KT 3346 11045

WOODALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 5:09 PM MST	Flash Flood Warning	PSR	La Paz, Yuma	3 hr
Sep 3, 5:42 PM MST	Flash Flood Warning	PSR	Maricopa	3 hr
Sep 3, 6:20 PM MST	Special Weather Statement	PSR		55 min
Sep 4, 1:37 AM MST	Special Weather Statement	PSR	Pinal	38 min
Sep 4, 1:59 AM MST	Areal Flood Advisory	PSR	Pinal	2 hr
Sep 4, 1:40 PM MST	Special Weather Statement	PSR		50 min
Sep 4, 2:31 PM MST	Special Weather Statement	PSR		59 min
Sep 4, 2:39 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	66 min
Sep 4, 3:12 PM MST	Special Weather Statement	PSR		48 min
Sep 4, 3:19 PM MST	Flash Flood Warning	PSR	Gila	101 min
Sep 4, 3:28 PM MST	Areal Flood Advisory	PSR	Maricopa	2 hr
Sep 4, 4:17 PM MST	Severe Thunderstorm Warning	PSR	Gila	43 min
Sep 4, 4:25 PM MST	Flash Flood Warning	PSR	Gila	2 hr
Sep 4, 4:48 PM MST	Special Weather Statement	PSR		57 min
Sep 3, 6:41 PM MST	Areal Flood Advisory	PSR	Riverside	3 hr
Sep 4, 1:45 PM MST	Special Weather Statement	PSR	Riverside	45 min
Sep 4, 1:55 PM MST	Flash Flood Warning	PSR	Riverside, San Bernardino	95 min
Sep 4, 2:42 PM MST	Areal Flood Advisory	PSR	Riverside	94 min
Sep 4, 2:54 PM MST	Special Weather Statement	PSR	Riverside	66 min
Sep 4, 3:18 PM MST	Areal Flood Advisory	PSR	Riverside, San Bernardino	80 min
Sep 4, 3:33 PM MST	Special Weather Statement	PSR	Imperial	57 min
Sep 4, 3:56 PM MST	Blowing Dust Advisory	PSR		2 hr
Sep 4, 3:57 PM MST	Special Weather Statement	PSR	Riverside	78 min
Sep 4, 4:09 PM MST	Flash Flood Warning	PSR	Imperial	92 min
Sep 4, 4:57 PM MST	Special Weather Statement	PSR	Riverside	48 min

Nearby

Special Weather Statements in Arizona, 2012 Every special weather statement in 2012

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.