Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 31, NWS Tucson, AZ

August 17, 2012Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 17, 2012, 11:02 AM MST for Pima County, Pinal County, Arizona. It was in force for 118 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
Aug 17, 2012, 11:02 AM MST (18:02 UTC)
Expired
Aug 17, 2012, 1:00 PM MST
In force
118 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

Counties Pima County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 94 km from the middle of the area, began a volume at 18:04 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 (KDMA), launched 12:00Z, 6.0 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 2012-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 560 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 2012-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
560 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1232 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
47 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.

344 
WGUS55 KTWC 171802
FFWTWC
AZC019-021-172000-
/O.NEW.KTWC.FF.W.0031.120817T1802Z-120817T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1102 AM MST FRI AUG 17 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 100 PM MST

* AT 1054 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM SEVERAL THUNDERSTORMS OVER THE WARNED AREA.
  THE HEAVIEST RAIN WAS INDICATED NEAR SIL NAGGIA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SIL
  NAGGIA AND NEARBY INDIAN ROADS 33 AND 34. ALSO INCLUDED ARE THE
  GU ACHI AND ANEGAM WASHES AND OTHERS THAT FLOW EAST INTO THE 
  SANTA ROSA VALLEY.

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 3250 11262 3250 11219 3268 11220 3268 11215
      3272 11215 3272 11204 3277 11204 3277 11191
      3211 11176 3238 11264

$$

KD
1 follow-up statement
018 
WGUS75 KTWC 171955
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1255 PM MST FRI AUG 17 2012

AZC019-021-172003-
/O.EXP.KTWC.FF.W.0031.000000T0000Z-120817T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-PINAL AZ-
1255 PM MST FRI AUG 17 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN PINAL AND
NORTH CENTRAL PIMA COUNTIES...

SOME RUNOFF WILL CONTINUE FROM EARLIER HEAVY RAINFALL BUT THE 
HEAVIEST RAIN HAD ENDED FOR NOW. ADDITIONAL THUNDERSTORMS ARE STILL 
POSSIBLE AND THE AREA REMAINS UNDER A FLASH FLOOD WATCH UNTIL 8 PM 
MST.

LAT...LON 3250 11262 3250 11219 3268 11220 3268 11215
      3272 11215 3272 11204 3277 11204 3277 11191
      3211 11176 3238 11264

$$

KD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 10:01 PM MSTAreal Flood AdvisoryTWCGraham119 min
Aug 17, 10:23 AM MSTFlash Flood WarningTWCSanta Cruz3 hr
Aug 17, 10:28 AM MSTFlash Flood WatchTWCCochise, Graham, Pima, Pinal, Santa Cruz6 hr
Aug 17, 12:26 PM MSTAreal Flood AdvisoryTWCPima3 hr
Aug 17, 12:39 PM MSTFlash Flood WarningTWCPima117 min
Aug 17, 1:00 PM MSTFlash Flood WarningTWCCochise2 hr
Aug 17, 1:20 PM MSTAreal Flood AdvisoryTWCPinal3 hr
Aug 17, 2:05 PM MSTFlash Flood WarningTWCPima, Pinal115 min
Aug 17, 2:36 PM MSTAreal Flood AdvisoryTWCPima3 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.