Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 77, NWS Tucson, AZ

September 10, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 10, 2012, 2:41 PM MST for Pima County, Arizona. It was in force for 94 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: Sep 10, 2012, 2:41 PM MST (21:41 UTC)
Expired: Sep 10, 2012, 4:15 PM MST
In force: 94 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 58 km from the middle of the area, began a volume at 21:41 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
Sep 10, 3:30 PM MST	FLASH FLOOD	4 E Ryan Field, AZ	VALENCIA ROAD CLOSED WESTBOUND FROM VIVIANA TO CAMINO VERDE.

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 26 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: 773 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

061 
WGUS55 KTWC 102141
FFWTWC
AZC019-102315-
/O.NEW.KTWC.FF.W.0077.120910T2141Z-120910T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
241 PM MST MON SEP 10 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 415 PM MST

* AT 237 PM MST...A LARGE CLUSTER OF THUNDERSTORMS WITH VERY HEAVY   
  RAINFALL WAS LOCATED OVER THE SOUTHWEST PORTIONS OF THE GREATER    
  TUCSON AREA NEAR INTERSTATE 19 WEST TO THREE POINTS. THESE STORMS  
  WERE TRACKING NORTH AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN
  XAVIER MISSION AND RYAN FIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 3227 11131 3228 11104 3196 11089 3190 11131

$$

1 follow-up statement

160 
WGUS75 KTWC 102233
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
333 PM MST MON SEP 10 2012

AZC019-102315-
/O.CON.KTWC.FF.W.0077.000000T0000Z-120910T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
333 PM MST MON SEP 10 2012

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

AT 323 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING ACROSS THE 
SOUTHWEST SIDE OF THE TUCSON METRO AREA. AN AUTOMATED RAIN GAUGE AT 
WADE ROAD AT LOS REALES HAS RECORDED 1.03 INCHES OF RAIN IN THE LAST 
HOUR. IN ADDITION...RADAR ESTIMATED RAINFALL AMOUNTS OF 2 TO 3 
INCHES HAVE OCCURRED WITH THIS STORM TO THE SOUTH OF VALENCIA ROAD. 
THIS IS RESULTING IN FLASH FLOODING ACROSS THE REGION INCLUDING 
VALENCIA ROAD. VALENCIA ROAD IS CLOSED FROM VIVIANA ROAD TO CAMINO 
VERDE ROAD. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN XAVIER
MISSION AND RYAN FIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

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 3227 11131 3228 11104 3196 11089 3190 11131

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 6:49 PM MST	Areal Flood Warning	TWC	Pima	18 hr
Sep 9, 11:55 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Sep 10, 12:46 PM MST	Areal Flood Warning	TWC	Pima	30 hr
Sep 10, 1:27 PM MST	Flash Flood Warning	TWC	Santa Cruz	2 hr
Sep 10, 1:37 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Sep 10, 2:24 PM MST	Flash Flood Warning	TWC	Cochise	111 min
Sep 10, 2:29 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Sep 10, 3:40 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	80 min
Sep 10, 3:44 PM MST	Special Weather Statement	TWC	Pima	46 min
Sep 10, 3:49 PM MST	Special Weather Statement	TWC	Pima	41 min
Sep 10, 3:53 PM MST	Severe Thunderstorm Warning	TWC	Pima	37 min
Sep 10, 3:54 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Sep 10, 4:13 PM MST	Flash Flood Warning	TWC	Pima, Santa Cruz	2 hr
Sep 10, 4:24 PM MST	Severe Thunderstorm Warning	TWC	Pima	36 min
Sep 10, 4:56 PM MST	Areal Flood Advisory	TWC	Graham, Pinal	112 min

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.