Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 21, NWS Tucson, AZ

July 24, 2011Graham County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 24, 2011, 4:15 PM MST for Graham 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: Jul 24, 2011, 4:15 PM MST (23:15 UTC)
Expired: Jul 24, 2011, 6:15 PM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Graham County, AZ

The radar

The Tucson radar (KEMX), 116 km from the middle of the area, began a volume at 23:15 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, 11.3 hours before the alert went out and 119 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: 362 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 93 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.

826 
WGUS55 KTWC 242315
FFWTWC
AZC009-250115-
/O.NEW.KTWC.FF.W.0021.110724T2315Z-110725T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
415 PM MST SUN JUL 24 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN GRAHAM COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 615 PM MST

* AT 406 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS PRODUCING HEAVY RAINFALL SOUTH OF SAFFORD ALONG 
HIGHWAY 191 AND 266. RADAR ESTIMATES INDICATE THAT FROM 1.00 TO 2.00 
INCHES OF RAINFALL HAS FALLEN. THIS WILL CAUSE AREA WASHES AND LOW 
WATER CROSSINGS TO FLOOD.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SWIFT TRAIL
  JUNCTION...MOUNT GRAHAM...FRYE MESA DAM AND FORT GRANT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 3277 11009 3278 10933 3244 10929 3244 11003

$$

SHOEMAKER

2 follow-up statements

512 
WGUS75 KTWC 250009
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
509 PM MST SUN JUL 24 2011

AZC009-250115-
/O.CON.KTWC.FF.W.0021.000000T0000Z-110725T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRAHAM AZ-
509 PM MST SUN JUL 24 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MST FOR
SOUTHEASTERN GRAHAM COUNTY...

AT 500 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING HEAVY RAINFALL SOUTH OF 
SAFFORD ALONG HIGHWAY 191 AND 266. RADAR ESTIMATES INDICATE THAT 
FROM 1.00 TO 3.00 INCHES OF RAIN HAS FALLEN. THIS WILL CAUSE AREA 
WASHES AND LOW WATER CROSSINGS TO FLOOD. FLOODING OF THE STOCKTON 
WILL LIKELY OCCUR.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SWIFT TRAIL
JUNCTION...MOUNT GRAHAM...FRYE MESA DAM AND FORT GRANT

LAT...LON 3277 11009 3278 10933 3244 10929 3244 11003

$$

SHOEMAKER

728 
WGUS75 KTWC 250119
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
619 PM MST SUN JUL 24 2011

AZC009-250128-
/O.EXP.KTWC.FF.W.0021.000000T0000Z-110725T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRAHAM AZ-
619 PM MST SUN JUL 24 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHEASTERN GRAHAM
COUNTY...

THIS WARNING HAS BEEN REPLACED BY A SMALL STREAM FLOOD ADVISORY 
UNTIL 9 PM MST. NORMALLY DRY WASHES AND STREAMS WILL CONTINUE TO 
EXPERIENCE ELEVATED FLOWS FOR THE NEXT FEW HOURS. PONDING OF WATER 
IN LOW-LYING AREAS CAN ALSO BE EXPECTED. 

LAT...LON 3277 11009 3278 10933 3244 10929 3244 11003

$$

!

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 5:39 PM MST	Severe Thunderstorm Warning	TWC	Pima	36 min
Jul 23, 5:41 PM MST	Severe Thunderstorm Warning	TWC	Pima	34 min
Jul 23, 7:09 PM MST	Severe Thunderstorm Warning	TWC	Pima	36 min
Jul 23, 9:23 PM MST	Areal Flood Advisory	TWC	Cochise	82 min
Jul 24, 5:41 AM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	111 min
Jul 24, 6:36 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	13 hr
Jul 24, 1:37 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 24, 2:10 PM MST	Flash Flood Warning	TWC	Greenlee	110 min
Jul 24, 4:05 PM MST	Severe Thunderstorm Warning	TWC	Graham	40 min
Jul 24, 4:18 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Jul 24, 4:25 PM MST	Flash Flood Warning	TWC	Cochise	3 hr
Jul 24, 4:38 PM MST	Flash Flood Warning	TWC	Cochise	112 min

Nearby

Flash Flood Warnings in Arizona, 2011 Every flash flood warning in 2011

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.