Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 63, NWS Tucson, AZ

September 6, 2012Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 6, 2012, 2:50 PM MST for Pima County, Pinal 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 6, 2012, 2:50 PM MST (21:50 UTC)
Expired
Sep 6, 2012, 5:45 PM MST
In force
3 hr
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), 104 km from the middle of the area, began a volume at 21:49 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

Phoenix, AZ (KPSR), launched 12:00Z, 9.8 hours before the alert went out and 109 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, Phoenix, AZ at 12:00Z on 2012-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 888 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, Phoenix, AZ at 12:00Z on 2012-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
888 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
1475 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
55 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.

314 
WGUS55 KTWC 062150
FFWTWC
AZC019-021-070045-
/O.NEW.KTWC.FF.W.0063.120906T2150Z-120907T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 545 PM MST

* AT 238 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS NEAR HICKIWAN...VENTANA AND
  WEST OF COVERED WELLS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VENTANA...
  VAYA CHIN...KOHATK...HICKIWAN AND COCKLEBUR

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 3198 11248 3250 11258 3250 11220 3267 11220
      3268 11215 3271 11215 3272 11205 3276 11204
      3277 11189 3193 11220

$$

KD
2 follow-up statements
799 
WGUS75 KTWC 062309
FFSTWC

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

AZC019-021-070045-
/O.CON.KTWC.FF.W.0063.000000T0000Z-120907T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-PINAL AZ-
409 PM MST THU SEP 6 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST FOR
SOUTHWESTERN PINAL AND CENTRAL PIMA COUNTIES...

AT 405 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING APPROACHING 
HICKIWAN AND WEST OF COCKLEBUR.  THE HEAVIEST RAIN FELL EARLIER
THIS AFTERNOON IN THE VAYA CHIN AREA AND NORTHWEST OF KOHATK.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VENTANA...
HICKIWAN...KOHATK AND COCKLEBUR.  IN ADDITION...WASHES WILL CONTINUE 
TO RUN RAPIDLY THIS AFTERNOON.

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 3198 11248 3250 11258 3250 11220 3267 11220
      3268 11215 3271 11215 3272 11205 3276 11204
      3277 11189 3193 11220

$$

KD
411 
WGUS75 KTWC 070036
FFSTWC

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

AZC019-021-070046-
/O.EXP.KTWC.FF.W.0063.000000T0000Z-120907T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-PINAL AZ-
536 PM MST THU SEP 6 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST FOR SOUTHWESTERN
PINAL AND CENTRAL PIMA COUNTIES...

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 3198 11248 3250 11258 3250 11220 3267 11220
      3268 11215 3271 11215 3272 11205 3276 11204
      3277 11189 3193 11220

$$

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, 2:55 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.