Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 68, NWS Tucson, AZ

September 10, 2011Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 10, 2011, 8:29 PM MST for Pima County, Arizona. It was in force for 61 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 10, 2011, 8:29 PM MST (03:29 UTC)
Expired: Sep 10, 2011, 9:30 PM MST
In force: 61 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 53 km from the middle of the area, began a volume at 03:30 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, 3.5 hours before the alert went out and 13 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: 263 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 2106 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 17 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.

859 
WGUS55 KTWC 110329
FFWTWC
AZC019-110430-
/O.NEW.KTWC.FF.W.0068.110911T0329Z-110911T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
829 PM MST SAT SEP 10 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITIES OF...TUCSON...ORO VALLEY...MARANA...

* UNTIL 930 PM MST

* AT 825 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES
  THAT MUCH OF THE RAINFALL HAD COME TO AN END ACROSS THE TUCSON
  METRO AREA. HOWEVER...FLOWING AND FLOODED WASHES CONTINUE TO
  BE A PROBLEM ACROSS THE METRO AREA DUE TO THE AMOUNT AND DURATION
  OF HEAVY RAINFALL EARLIER. CITY OFFICIALS HAVE STATED THAT 
  NUMEROUS FLOODING PROBLEMS CONTINUE ACROSS THE CITY. THEREFORE...
  THE FLASH FLOOD WARNING FOR NORTHEAST PIMA COUNTY HAS BEEN 
  EXTENDED. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AVRA VALLEY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3249 11135 3250 11047 3186 11047 3187 11141

$$
ZELL

1 follow-up statement

280 
WGUS75 KTWC 110433
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
933 PM MST SAT SEP 10 2011

AZC019-110442-
/O.EXP.KTWC.FF.W.0068.000000T0000Z-110911T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
933 PM MST SAT SEP 10 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN PIMA
COUNTY...

AT 928 PM MST...NATIONAL WEATHER SERVICE RADAR SHOWED THE RAIN CAME  
TO AN END AND THE THREAT OF HEAVY RAIN AND FLASH FLOODING HAS ENDED. 
THEREFORE...THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. 

LAT...LON 3249 11135 3250 11047 3186 11047 3187 11141

$$
ZELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 5:09 PM MST	Areal Flood Advisory	TWC	Pima	47 min
Sep 10, 5:17 PM MST	Areal Flood Advisory	TWC	Cochise	88 min
Sep 10, 5:22 PM MST	Severe Thunderstorm Warning	TWC	Pima	24 min
Sep 10, 5:24 PM MST	Areal Flood Advisory	TWC	Pima	111 min
Sep 10, 5:39 PM MST	Flash Flood Warning	TWC	Pima	81 min
Sep 10, 5:43 PM MST	Severe Thunderstorm Warning	TWC	Pima	62 min
Sep 10, 5:43 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Sep 10, 6:08 PM MST	Flash Flood Warning	TWC	Pima	112 min
Sep 10, 6:08 PM MST	Flash Flood Warning	TWC	Cochise	82 min
Sep 10, 6:59 PM MST	Flash Flood Warning	TWC	Pima	91 min
Sep 10, 7:20 PM MST	Areal Flood Advisory	TWC	Cochise	85 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.