Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 23, NWS Tucson, AZ

July 29, 2012Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 29, 2012, 2:16 PM MST for Pima County, Pinal County, Arizona. It was in force for 119 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 29, 2012, 2:16 PM MST (21:16 UTC)
Expired: Jul 29, 2012, 4:15 PM MST
In force: 119 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

Counties Pima County, AZ, Pinal County, AZ

The radar

The Tucson radar (KEMX), 95 km from the middle of the area, began a volume at 21:17 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.

What was reported inside it

Time	Report	Where	Remark
Jul 29, 4:13 PM MST	FLASH FLOOD	Marana, AZ	SWIFT WATER RESCUE ON SANDARIO ROAD IN MARANA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 9.3 hours before the alert went out and 62 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: 397 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1146 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 5 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.

341 
WGUS55 KTWC 292116
FFWTWC
AZC019-021-292315-
/O.NEW.KTWC.FF.W.0023.120729T2116Z-120729T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
216 PM MST SUN JUL 29 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITIES OF...ORO VALLEY...MARANA...
  EXTREME SOUTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 415 PM MST

* AT 206 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN AND LIKELY FLASH FLOODING FROM A THUNDERSTORM OVER 
  PICTURE ROCKS. UP TO 2 INCHES OF RAIN HAD FALLEN IN THIS AREA.
  THUNDERSTORMS PRODUCING HEAVY RAIN STRETCHED FROM TUCSON WESTWARD
  TO THE TOHONO O ODHAM NATION.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MARANA...
  AVRA VALLEY AND SANTA ROSA RANCH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS
WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 3198 11206 3250 11212 3251 11115 3250 11084
      3228 11095 3198 11167

$$

KD

2 follow-up statements

721 
WGUS75 KTWC 292219
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
319 PM MST SUN JUL 29 2012

AZC019-021-292315-
/O.CON.KTWC.FF.W.0023.000000T0000Z-120729T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-PINAL AZ-
319 PM MST SUN JUL 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST FOR
EXTREME SOUTH CENTRAL PINAL AND CENTRAL PIMA COUNTIES...

AT 314 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING FROM THE NORTHWEST 
SIDE OF TUCSON WESTWARD ACROSS TOWARD THE TOHONO OODHAM NATION. THE 
HEAVIEST RAINFALL AT THIS TIME IS LOCATED ON THE NORTHWEST SIDE OF 
TUCSON WHERE EXPECTED RAINFALL AMOUNTS IN EXCESS OF ONE INCH WILL 
PRODUCE FLASH FLOODING. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SANTA ROSA...
ORO VALLEY...MARANA AND AVRA VALLEY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3198 11206 3250 11212 3251 11115 3250 11084
      3228 11095 3198 11167

$$

GL

313 
WGUS75 KTWC 292243
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
343 PM MST SUN JUL 29 2012

AZC019-021-292315-
/O.CON.KTWC.FF.W.0023.000000T0000Z-120729T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-PINAL AZ-
343 PM MST SUN JUL 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST FOR
EXTREME SOUTH CENTRAL PINAL AND CENTRAL PIMA COUNTIES...

AT 335 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE AN AREA OF STRONG THUNDERSTORMS PRODUCING EXTREMELY HEAVY 
RAINFALL FLASH FLOODING CENTRAL AND EASTERN PIMA COUNTIES. THE 
HEAVIEST RAINFALL WAS OCCURRING NEAR AND EAST OF AVRA 
VALLEY...PICTURE ROCKS...THE TUCSON MOUNTAINS...AND INTERSTATE 10 
FROM NORTHWEST TUCSON TO MARANA. RAINFALL AMOUNTS IN EXCESS OF 2 
INCHES WERE GENERATING DANGEROUS FLASH FLOOD CONDITIONS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ORO VALLEY...
MARANA AND AVRA VALLEY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES 
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS 
WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 3198 11206 3250 11212 3251 11115 3250 11084
      3228 11095 3198 11167

$$

MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 5:32 PM MST	Areal Flood Advisory	TWC	Pinal	118 min
Jul 28, 6:00 PM MST	Areal Flood Advisory	TWC	Pima	90 min
Jul 29, 9:56 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	10 hr
Jul 29, 11:23 AM MST	Special Weather Statement	TWC		37 min
Jul 29, 11:43 AM MST	Areal Flood Advisory	TWC	Pima	92 min
Jul 29, 12:44 PM MST	Special Weather Statement	TWC	Graham	31 min
Jul 29, 1:19 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 29, 2:01 PM MST	Special Weather Statement	TWC		44 min
Jul 29, 2:44 PM MST	Flash Flood Warning	TWC	Pima	91 min
Jul 29, 3:12 PM MST	Areal Flood Advisory	TWC	Pinal	2 hr
Jul 29, 3:26 PM MST	Special Weather Statement	TWC	Pinal	49 min
Jul 29, 4:13 PM MST	Flash Flood Warning	TWC	Pima	2 hr

Nearby

Flash Flood Warnings in Arizona, 2012 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.