Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 34, NWS Tucson, AZ

August 7, 2011Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 7, 2011, 2:00 PM MST for Pima County, Arizona. It was in force for 90 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 7, 2011, 2:00 PM MST (21:00 UTC)
Expired: Aug 7, 2011, 3:30 PM MST
In force: 90 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 97 km from the middle of the area, began a volume at 21:01 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, 9.0 hours before the alert went out and 90 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: 897 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1635 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 42 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.

853 
WGUS55 KTWC 072100
FFWTWC
AZC019-072230-
/O.NEW.KTWC.FF.W.0034.110807T2100Z-110807T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
200 PM MST SUN AUG 7 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 330 PM MST

* AT 152 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN FROM A STRONG THUNDERSTORM OVER SOUTH CENTRAL PIMA
  COUNTY...NEAR THE JUNCTIONS OF STATE HIGHWAY 286 AND ARIVACA
  ROAD. THIS THUNDERSTORM WAS MOVING SLOWLY WEST AT 5 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JUNCTION OF
  HIGHWAY 286 AND ARIVACA ROAD AND FRESNAL CANYON

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 3164 11176 3183 11168 3178 11141 3151 11144
      3148 11153 3154 11170

$$
ZELL

1 follow-up statement

810 
WGUS75 KTWC 072127
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
227 PM MST SUN AUG 7 2011

AZC019-072230-
/O.CON.KTWC.FF.W.0034.000000T0000Z-110807T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
227 PM MST SUN AUG 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM MST FOR SOUTH
CENTRAL PIMA COUNTY...

AT 220 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A STRONG THUNDERSTORM PRODUCING VERY HEAVY RAINFALL. THIS 
STORM WAS LOCATED 8 MILES WEST OF THE JUNCTION OF HIGHWAY 286 AND 
ARIVACA ROAD...OR 24 MILES SOUTHEAST OF SELLS...MOVING WEST AT 
10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FRESNAL
CANYON

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. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3164 11176 3183 11168 3178 11141 3151 11144
      3148 11153 3154 11170

$$
ZELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 5:27 PM MST	Areal Flood Advisory	TWC	Pima	78 min
Aug 7, 12:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	47 min
Aug 7, 1:06 PM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	105 min
Aug 7, 2:31 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	44 min
Aug 7, 3:03 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	105 min
Aug 7, 3:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Aug 7, 3:18 PM MST	Flash Flood Warning	TWC	Pima	117 min
Aug 7, 4:46 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	104 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.