Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 60, NWS Tucson, AZ

September 6, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 6, 2012, 2:06 PM MST for Pima County, Arizona. It was in force for 84 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 6, 2012, 2:06 PM MST (21:06 UTC)
Expired
Sep 6, 2012, 3:30 PM MST
In force
84 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 27 km from the middle of the area, began a volume at 21:10 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

TimeReportWhereRemark
Sep 6, 2:37 PM MSTFLASH FLOOD2 Wnw Corona De Tucson, AZSAHUARITA ROAD IMPASSABLE AT OCOTILLO VIEW

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, 9.1 hours before the alert went out and 17 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°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.

933 
WGUS55 KTWC 062106
FFWTWC
AZC019-062230-
/O.NEW.KTWC.FF.W.0060.120906T2106Z-120906T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
206 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...

* UNTIL 330 PM MST

* AT 200 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER SAHUARITA ROAD WEST
  OF CORONA DE TUCSON. A SPOTTER REPORTED THREE QUARTERS OF AN 
  INCH OF RAIN IN LESS THAN 30 MINUTES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAHUARITA
  ROAD FROM SAHUARITA TO CORONA DE TUCSON.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
TUCSON.

&&

LAT...LON 3208 11101 3206 11069 3194 11070 3192 11098

$$

KD
1 follow-up statement
874 
WGUS75 KTWC 062226
FFSTWC

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

AZC019-062232-
/O.EXP.KTWC.FF.W.0060.000000T0000Z-120906T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
326 PM MST THU SEP 6 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 330 PM MST FOR EAST CENTRAL
PIMA COUNTY...

THE INTENSE PRECIPITATION IN EAST CENTRAL PIMA COUNTY HAS DECREASED. 
RADAR INDICATES LIGHT SHOWERS REMAIN WITH RAINFALL RATES ABOUT ONE 
QUARTER OF AN INCH PER HOUR. LAW ENFORCEMENT REPORTED THAT 
SAHUARITA ROAD REMAINS IMPASSABLE. LOW WATER CROSSING AND WASHES 
WILL CONTINUE TO FLOW FOR THE NEXT COUPLE OF HOURS. DRIVERS SHOULD 
USE CAUTION WHEN APPROACHING WATER CROSSINGS.

LAT...LON 3208 11101 3206 11069 3194 11070 3192 11098

$$

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, 2:30 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, 3:36 PM MSTFlash Flood WarningTWCPima114 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.