Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 8, NWS Tucson, AZ

July 7, 2011Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 7, 2011, 6:48 PM MST for Pima 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: Jul 7, 2011, 6:48 PM MST (01:48 UTC)
Expired: Jul 7, 2011, 8:45 PM MST
In force: 117 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 62 km from the middle of the area, began a volume at 01:49 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, 1.8 hours before the alert went out and 25 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: 583 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 2931 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 101 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.

834 
WGUS55 KTWC 080148
FFWTWC
AZC019-080345-
/O.NEW.KTWC.FF.W.0008.110708T0148Z-110708T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
648 PM MST THU JUL 7 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 845 PM MST

* AT 635 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING DUE TO THUNDERSTORMS FROM CATALINA TO ORO VALLEY TO 
THE CATALINA FOOT HILLS. RADAR AND GAUGE REPORTS INDICATE THAT FROM 
0.75 TO 2 INCHES OF RAINFALL HAS OCCURRED OVER THE PAST HOUR. 
FLOODING OF THE CDO WASH...PIMA WASH AND SABINO CREEK WILL OCCUR. 
FLOODING IS LIKELY ALONG ORACLE ROAD FROM CATALINA TO GRANT ROAD.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CATALINA
  STATE PARK 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 3235 11106 3251 11098 3251 11083 3244 11083
      3235 11075 3225 11096

$$

SHOEMAKER

1 follow-up statement

035 
WGUS75 KTWC 080342
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
842 PM MST THU JUL 7 2011

AZC019-080351-
/O.EXP.KTWC.FF.W.0008.000000T0000Z-110708T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
842 PM MST THU JUL 7 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MST FOR NORTHEASTERN
PIMA COUNTY...

A FLOOD ADVISORY REMAINS IN EFFECT FOR THE AREA...AS RUNOFF FROM 
EARLIER HEAVY RAINFALL CONTINUES.

LAT...LON 3235 11106 3251 11098 3251 11083 3244 11083
      3235 11075 3225 11096

$$

CS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 5:01 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 7, 5:31 PM MST	Severe Thunderstorm Warning	TWC	Pima	59 min
Jul 7, 5:32 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Jul 7, 5:44 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Jul 7, 6:05 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 7, 6:27 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	63 min
Jul 7, 6:36 PM MST	Severe Thunderstorm Warning	TWC	Pima	39 min
Jul 7, 6:39 PM MST	Dust Storm Warning	TWC	Pima, Pinal	53 min
Jul 7, 8:58 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	107 min
Jul 8, 3:02 PM MST	Severe Thunderstorm Warning	TWC	Cochise	28 min
Jul 8, 3:24 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 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.