Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 65, NWS Tucson, AZ

September 6, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 6, 2012, 3:36 PM MST for Pima County, Arizona. It was in force for 114 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 6, 2012, 3:36 PM MST (22:36 UTC)
Expired
Sep 6, 2012, 5:30 PM MST
In force
114 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 48 km from the middle of the area, began a volume at 22:39 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, 10.6 hours before the alert went out and 8 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-pSkew-T log-p diagram, Tuscon, AZ at 12:00Z on 2012-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1314 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 2012-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1314 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
1026 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
24 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.

040 
WGUS55 KTWC 062236
FFWTWC
AZC019-070030-
/O.NEW.KTWC.FF.W.0065.120906T2236Z-120907T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
336 PM MST THU SEP 6 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 530 PM MST

* AT 330 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN FROM A CLUSTER OF THUNDERSTORMS OVER THE TUCSON
  METRO AREA...INCLUDING VAIL...MARANA...AND ORO VALLEY. OTHER
  STORMS WERE ALSO DEVELOPING OVER THE CITY. ALL THE STORMS WERE
  MOVING SLOWLY TO THE NORTHWEST AT 5 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH
  TUCSON...SEVEN FALLS...SABINO CANYON...DOVE MOUNTAIN...CATALINA
  STATE PARK...CATALINA FOOTHILLS AND CATALINA.

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3250 11124 3251 11083 3191 11059 3190 11090
      3207 11095 3213 11099

$$
ZELL
1 follow-up statement
907 
WGUS75 KTWC 070022
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
522 PM MST THU SEP 6 2012

AZC019-070032-
/O.EXP.KTWC.FF.W.0065.000000T0000Z-120907T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
522 PM MST THU SEP 6 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 530 PM MST FOR EAST CENTRAL
PIMA COUNTY...

ALTHOUGH AMPLE TIME HAS ELAPSED WHERE FLASH FLOODING IS NO LONGER A 
THREAT...SIGNIFICANT WATER FLOWING IN NORMALLY DRY WASHES...ROADWAY 
DIPS AND OTHER LOW LYING AREAS IS STILL LIKELY TO RESULT IN MINOR 
FLOODING ISSUES.

A SMALL STREAM FLOOD ADVISORY WILL REMAIN IN EFFECT UNTIL 1000 PM 
MST FOR SOUTHERN PINAL...PIMA...SANTA CRUZ AND EXTREME SOUTHWESTERN
COCHISE COUNTIES.

LAT...LON 3250 11124 3251 11083 3191 11059 3190 11090
      3207 11095 3213 11099

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 5:33 PM MSTAreal Flood AdvisoryTWCPima3 hr
Sep 5, 6:30 PM MSTSpecial Weather StatementTWCGreenlee30 min
Sep 6, 12:13 PM MSTAreal Flood AdvisoryTWCCochise2 hr
Sep 6, 12:55 PM MSTFlash Flood WarningTWCPima3 hr
Sep 6, 1:19 PM MSTAreal Flood AdvisoryTWCCochise, Pima, Santa Cruz116 min
Sep 6, 1:39 PM MSTFlash Flood WarningTWCPima2 hr
Sep 6, 1:48 PM MSTFlash Flood WarningTWCPima3 hr
Sep 6, 2:06 PM MSTFlash Flood WarningTWCPima84 min
Sep 6, 2:30 PM MSTFlash Flood WarningTWCPima, Santa Cruz2 hr
Sep 6, 2:48 PM MSTFlash Flood WarningTWCPima117 min
Sep 6, 2:50 PM MSTFlash Flood WarningTWCPima, Pinal3 hr
Sep 6, 2:55 PM MSTSevere Thunderstorm WarningTWCSanta Cruz35 min
Sep 6, 3:04 PM MSTFlash Flood WarningTWCSanta Cruz116 min
Sep 6, 3:17 PM MSTSevere Thunderstorm WarningTWCPima24 min
Sep 6, 4:05 PM MSTAreal Flood AdvisoryTWCCochise, Pima, Pinal, Santa Cruz6 hr

Nearby

Flash Flood Warnings in Arizona, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.