Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 74, NWS Tucson, AZ

September 8, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 8, 2012, 3:56 PM MST for Pima County, Arizona. It was in force for 2 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, 3:56 PM MST (22:56 UTC)
Expired
Sep 8, 2012, 6:00 PM MST
In force
2 hr
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 136 km from the middle of the area, began a volume at 22:58 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, 10.9 hours before the alert went out and 117 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°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.

455 
WGUS55 KTWC 082256
FFWTWC
AZC019-090100-
/O.NEW.KTWC.FF.W.0074.120908T2256Z-120909T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 600 PM MST

* AT 351 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A STATIONARY THUNDERSTORM PRODUCING HEAVY RAIN SOUTH OF COWLIC.
  DOPPLER RADAR ESTIMATES THAT ONE TO TWO INCHES OF RAIN HAS FALLEN 
  IN THE AREA SOUTH OF COWLIC AND EAST OF PAPAGO FARMS IN THE PAST 
  HOUR.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PAPAGO
  FARMS...COWLIC AND BIG FIELDS

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.

&&

LAT...LON 3194 11204 3171 11186 3161 11194 3176 11243

$$
2 follow-up statements
838 
WGUS75 KTWC 082345
FFSTWC

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

AZC019-090100-
/O.CON.KTWC.FF.W.0074.000000T0000Z-120909T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
445 PM MST SAT SEP 8 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MST FOR SOUTH
CENTRAL PIMA COUNTY...

AT 437 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED THAT 
HEAVY RAIN HAS ENDED BUT FLASH FLOODING IS LIKELY STILL OCCURRING IN 
THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PAPAGO
FARMS...COWLIC AND BIG FIELDS

LAT...LON 3194 11204 3171 11186 3161 11194 3176 11243

$$
765 
WGUS75 KTWC 090058
FFSTWC

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

AZC019-090107-
/O.EXP.KTWC.FF.W.0074.000000T0000Z-120909T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
558 PM MST SAT SEP 8 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM MST FOR SOUTH
CENTRAL PIMA COUNTY...


HEAVY RAIN HAS ENDED ACROSS THE WARNED AREA WITH WATER STILL FLOWING 
IN THE STREAMS AND WASHES.

LAT...LON 3194 11204 3171 11186 3161 11194 3176 11243

$$

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, 1:41 PM MSTFlash Flood WarningTWCPima3 hr
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, 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.