Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 24, NWS Tucson, AZ

July 29, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 29, 2012, 2:44 PM MST for Pima County, Arizona. It was in force for 91 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, 2:44 PM MST (21:44 UTC)
Expired: Jul 29, 2012, 4:15 PM MST
In force: 91 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 45 km from the middle of the area, began a volume at 21:46 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, 3:47 PM MST	FLASH FLOOD	Catalina Foothills, AZ	SWIFT WATER RESCUE AT MISSION VALDOSTA AND ALSO AT PASEO AQUIMURI

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, 9.7 hours before the alert went out and 7 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.

238 
WGUS55 KTWC 292144
FFWTWC
AZC019-292315-
/O.NEW.KTWC.FF.W.0024.120729T2144Z-120729T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITY OF TUCSON...

* UNTIL 415 PM MST

* AT 236 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SABINO     
  CANYON...REDINGTON...MOUNT LEMMON/SUMMERHAVEN AND CATALINA         
  FOOTHILLS.

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.

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 3249 11084 3250 11047 3183 11046 3195 11127
      3207 11147 3228 11095

$$

GL

1 follow-up statement

912 
WGUS75 KTWC 292215
FFSTWC

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

AZC019-292315-
/O.CON.KTWC.FF.W.0024.000000T0000Z-120729T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
315 PM MST SUN JUL 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST FOR
NORTHEASTERN PIMA COUNTY...

AT 309 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE WARNED 
AREA. AUTOMATED RAINFALL GAUGES INDICATE OVER ONE INCH OF RAINFALL 
HAS OCCURRED IN THE FOOTHILLS WITH FAIRLY WIDESPREAD RAINFALL 
AMOUNTS OF ONE QUARTER OF AN INCH TO ONE INCH MAINLY ON THE EAST AND 
NORTHWEST SIDES. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SEVEN
FALLS...SABINO CANYON...REDINGTON...MOUNT LEMMON/SUMMERHAVEN AND
CATALINA FOOTHILLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3249 11084 3250 11047 3183 11046 3195 11127
      3207 11147 3228 11095

$$

GL

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, 2:16 PM MST	Flash Flood Warning	TWC	Pima, Pinal	119 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.