Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 68, NWS Tucson, AZ

September 6, 2012Graham County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 6, 2012, 8:48 PM MST for Graham County, Arizona. It was in force for 117 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: Sep 6, 2012, 8:48 PM MST (03:48 UTC)
Expired: Sep 6, 2012, 10:45 PM MST
In force: 117 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Graham County, AZ

The radar

The Tucson radar (KEMX), 127 km from the middle of the area, began a volume at 03:50 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 00:00Z, 3.8 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 777 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 84 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.

286 
WGUS55 KTWC 070348
FFWTWC
AZC009-070545-
/O.NEW.KTWC.FF.W.0068.120907T0348Z-120907T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL GRAHAM COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 1045 PM MST

* AT 844 PM MST...WEATHER SERVICE RADAR INDICATED BETWEEN 1.50 AND 
2.50 INCHES OF RAIN HAS FALLEN ALONG AND NORTHEAST OF THE JUNCTION OF 
HIGHWAYS 191 AND 266 TO THE SOUTH OF SAFFORD. RAPID RAINFALL RUNOFF 
WILL LIKELY RESULT IN FLASH FLOODING. EXPECT RAPID RISES OF RUNNING 
WATER ON WASHES LEADING TO THE SAN SIMON RIVER...AS WELL AS 
MARIJILDA WASH...STOCKTON WASH...JACOBSON CREEK...OWL WASH...OAK 
DRAW...SLICK ROCK WASH AND WILLOW SPRING WASH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
SAN SIMON RIVER...GILA RIVER...MARIJILDA WASH...STOCKTON WASH...
JACOBSON CREEK...OWL WASH...OAK DRAW...SLICK ROCK WASH...W A WASH AND
WILLOW SPRING WASH.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS
WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 3260 10972 3274 10981 3273 10969 3281 10962
      3269 10947 3252 10945

$$

1 follow-up statement

304 
WGUS75 KTWC 070537
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1037 PM MST THU SEP 6 2012

AZC009-070546-
/O.EXP.KTWC.FF.W.0068.000000T0000Z-120907T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRAHAM AZ-
1037 PM MST THU SEP 6 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM MST FOR SOUTH
CENTRAL GRAHAM COUNTY...

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.

HOWEVER...RAINFALL RUNOFF WILL CONTINUE TO RESULT IN RUNNING 
WASHES...ESPECIALLY SMALL WASHES THAT DRAIN INTO THE SAN SIMON 
RIVER...AS WELL AS MARIJILDA WASH...STOCKTON WASH...JACOBSON 
CREEK...OWL WASH...OAK DRAW...SLICK ROCK WASH AND WILLOW SPRING WASH.

LAT...LON 3260 10972 3274 10981 3273 10969 3281 10962
      3269 10947 3252 10945

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 5:15 PM MST	Flash Flood Warning	TWC	Pinal	90 min
Sep 6, 5:37 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	38 min
Sep 6, 5:54 PM MST	Flash Flood Warning	TWC	Greenlee	111 min
Sep 6, 9:14 PM MST	Special Weather Statement	TWC	Graham	46 min
Sep 7, 4:50 AM MST	Areal Flood Advisory	TWC	Pima	3 hr
Sep 7, 5:47 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	12 hr
Sep 7, 6:13 AM MST	Areal Flood Advisory	TWC	Pima	3 hr
Sep 7, 6:21 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Sep 7, 7:44 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Sep 7, 12:55 PM MST	Flash Flood Warning	TWC	Cochise, Santa Cruz	110 min
Sep 7, 1:08 PM MST	Flash Flood Warning	TWC	Cochise	112 min
Sep 7, 1:58 PM MST	Flash Flood Warning	TWC	Cochise	3 hr
Sep 7, 2:45 PM MST	Areal Flood Advisory	TWC	Cochise	90 min
Sep 7, 3:35 PM MST	Areal Flood Advisory	TWC	Cochise	115 min
Sep 7, 3:47 PM MST	Flash Flood Warning	TWC	Greenlee	118 min
Sep 7, 4:52 PM MST	Special Weather Statement	TWC	Graham	23 min

Nearby

Flash Flood Warnings in Arizona, 2012 Every 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.