Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Tucson, AZ

July 4, 2011Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 4, 2011, 4:31 PM MST for Pima County, Arizona. It was in force for 89 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 4, 2011, 4:31 PM MST (23:31 UTC)
Expired: Jul 4, 2011, 6:00 PM MST
In force: 89 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 48 km from the middle of the area, began a volume at 23:34 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.

What was reported inside it

Time	Report	Where	Remark
Jul 4, 5:30 PM MST	FLASH FLOOD	2 Nne Vail, AZ	PANTANO WASH NR HOUGHTON

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 11.5 hours before the alert went out and 8 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: 1243 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

213 
WGUS55 KTWC 042331
FFWTWC
AZC019-050100-
/O.NEW.KTWC.FF.W.0003.110704T2331Z-110705T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
431 PM MST MON JUL 4 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 600 PM MST

* AT 424 PM MST...TRAINED WEATHER SPOTTERS REPORTED VERY HEAVY RAIN  
  FROM A LINE OF THUNDERSTORMS MOVING WEST AT 10 MPH OVER THE ENTIRE 
  TUCSON METRO AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH      
  TUCSON...SAGUARO NATIONAL PARK EAST...SABINO   CANYON...MOUNT      
  LEMMON/SUMMERHAVEN...DOVE MOUNTAIN...DAVIS-MONTHAN AIR FORCE       
  BASE...CATALINA STATE PARK AND CATALINA FOOTHILLS.

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 3249 11123 3244 11066 3186 11049 3190 11110

$$

1 follow-up statement

628 
WGUS75 KTWC 050106
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
606 PM MST MON JUL 4 2011

AZC019-050111-
/O.EXP.KTWC.FF.W.0003.000000T0000Z-110705T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
606 PM MST MON JUL 4 2011

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

THE THUNDERSTORMS THAT PRODUCED MODERATE TO HEAVY RAIN OVER THE 
TUCSON METRO AREA AND SURROUNDING CITIES HAVE MOVED WEST INTO 
CENTRAL PORTIONS OF PIMA COUNTY...INCLUDING THE TOHONO O'ODHAM 
NATION. THEREFORE...THE FLASH FLOOD WARNING WAS ALLOWED TO EXPIRE AT 
6 PM MST. THERE WILL CONTINUE TO BE SOME PONDING OF WATER IN LOW 
LYING AREAS ALONG WITH SOME LOCALIZED STREET FLOODING DURING THE 
NEXT HOUR OR SO.    

LAT...LON 3249 11123 3244 11066 3186 11049 3190 11110

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 10:27 PM MST	Areal Flood Advisory	TWC	Pima	68 min
Jul 4, 5:53 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	112 min
Jul 4, 11:58 AM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 4, 12:54 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	51 min
Jul 4, 1:17 PM MST	Flash Flood Warning	TWC	Santa Cruz	58 min
Jul 4, 1:38 PM MST	Areal Flood Advisory	TWC	Cochise	112 min
Jul 4, 2:46 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	44 min
Jul 4, 3:39 PM MST	Areal Flood Advisory	TWC	Pima	55 min
Jul 4, 4:03 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Jul 4, 4:15 PM MST	Severe Thunderstorm Warning	TWC	Pima	39 min
Jul 4, 4:44 PM MST	Dust Storm Warning	TWC	Pima, Pinal	6 min
Jul 4, 4:48 PM MST	Severe Thunderstorm Warning	TWC	Pima	57 min
Jul 4, 4:50 PM MST	Dust Storm Warning	TWC	Pima, Pinal	70 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.