Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 64, NWS Tucson, AZ

September 10, 2011Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 10, 2011, 5:39 PM MST for Pima County, Arizona. It was in force for 81 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, 5:39 PM MST (00:39 UTC)
Expired: Sep 10, 2011, 7:00 PM MST
In force: 81 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 00:39 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, 0.7 hours before the alert went out and 14 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.

129 
WGUS55 KTWC 110039
FFWTWC
AZC019-110200-
/O.NEW.KTWC.FF.W.0064.110911T0039Z-110911T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
539 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 700 PM MST

* AT 535 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  AN AREA OF STRONG TO SEVERE THUNDERSTORMS PRODUCING VERY HEAVY 
  RAINFALL ACROSS MUCH OF THE TUCSON METRO AREA...INCLUDING ORO
  VALLEY...CATALINA...AND VAIL. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED SAGUARO 
  NATIONAL PARK WEST...SABINO CANYON...REDINGTON...MOUNT LEMMON
  AND SUMMERHAVEN...DOVE MOUNTAIN...CATALINA STATE PARK...
  CATALINA FOOTHILLS...PICTURE ROCKS AND CATALINA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 3231 11135 3250 11124 3251 11046 3196 11046
      3205 11091 3200 11143

$$
ZELL

1 follow-up statement

394 
WGUS75 KTWC 110121
FFSTWC

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

AZC019-110200-
/O.CON.KTWC.FF.W.0064.000000T0000Z-110911T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
621 PM MST SAT SEP 10 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MST FOR
NORTHEASTERN PIMA COUNTY...

AT 620 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A CLUSTER OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER 
MUCH OF THE TUCSON METRO AREA...INCLUDING ORO VALLEY...CATALINA...
AND VAIL.

RADAR RAINFALL ESTIMATES INDICATE THAT BETWEEN ONE AND TWO INCHES OF 
RAINFALL HAS OCCURRED ACROSS MUCH OF CENTRAL TUCSON. MANY WASHES 
WILL BE OVERFLOWING THEIR BANKS. THIS IS A DANGEROUS SITUATION.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TUCSON...ORO
VALLEY AND MARANA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3231 11135 3250 11124 3251 11046 3196 11046
      3205 11091 3200 11143

$$
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, 5:43 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
Sep 10, 8:29 PM MST	Flash Flood Warning	TWC	Pima	61 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.