Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 73, NWS Tucson, AZ

September 8, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 8, 2012, 1:41 PM MST for Pima County, Arizona. It was in force for 3 hr. 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 8, 2012, 1:41 PM MST (20:41 UTC)
Expired
Sep 8, 2012, 4:45 PM MST
In force
3 hr
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 151 km from the middle of the area, began a volume at 20:41 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.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 8.7 hours before the alert went out and 131 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 2012-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1618 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 2012-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 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
1618 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
990 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
37 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.

428 
WGUS55 KTWC 082041
FFWTWC
AZC019-082345-
/O.NEW.KTWC.FF.W.0073.120908T2041Z-120908T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
141 PM MST SAT SEP 8 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 445 PM MST

* AT 132 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM A THUNDERSTORM IN THE PISINIMO AREA ON THE     
  TOHONO OODHAM NATION. THE HEAVIEST RAINFALL PER DOPPLER RADAR OF   
  ONE TO TWO INCHES HAS OCCURRED ALONG INDIAN ROUTE 28 TO THE EAST   
  OF PISINIMO.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PISINIMO...
  MOUNTAIN VILLAGE AND PISINEMO

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES
AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF
CREEKS AND STREAMS.

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 3216 11248 3216 11213 3207 11202 3194 11204
      3182 11231 3192 11250

$$

GL
2 follow-up statements
485 
WGUS75 KTWC 082200
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
300 PM MST SAT SEP 8 2012

AZC019-082345-
/O.CON.KTWC.FF.W.0073.000000T0000Z-120908T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
300 PM MST SAT SEP 8 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST FOR
CENTRAL PIMA COUNTY...

AT 252 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED ONE 
TO TWO INCHES OF RAINFALL FROM THUNDERSTORMS EARLY THIS AFTERNOON 
ACROSS PORTIONS OF THE TOHONO OODHAM NATION FROM THE PISINOMO AREA 
EASTWARD TO HIGHWAY 86. THIS WILL CONTINUE TO PRODUCE FLASH FLOODING 
IN AREA WASHES. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PISINIMO AND 
MOUNTAIN VILLAGE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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 3216 11248 3216 11213 3207 11202 3194 11204
      3182 11231 3192 11250

$$

GL
908 
WGUS75 KTWC 082343
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
443 PM MST SAT SEP 8 2012

AZC019-082352-
/O.EXP.KTWC.FF.W.0073.000000T0000Z-120908T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
443 PM MST SAT SEP 8 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 445 PM MST FOR CENTRAL PIMA
COUNTY...

HEAVY RAIN HAS ENDED ACROSS THE WARNED AREA WITH STREAMS AND WASHES 
LIKELY RUNNING.

LAT...LON 3216 11248 3216 11213 3207 11202 3194 11204
      3182 11231 3192 11250

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 5:24 PM MSTAreal Flood AdvisoryTWCGraham81 min
Sep 8, 1:19 PM MSTSevere Thunderstorm WarningTWCPima26 min
Sep 8, 2:27 PM MSTSpecial Weather StatementTWCPima33 min
Sep 8, 2:33 PM MSTSevere Thunderstorm WarningTWCPima27 min
Sep 8, 3:14 PM MSTAreal Flood AdvisoryTWCPima3 hr
Sep 8, 3:56 PM MSTFlash Flood WarningTWCPima2 hr
Sep 8, 4:42 PM MSTAreal Flood WarningTWCPima12 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.