Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 42, NWS Tucson, AZ

August 21, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 21, 2012, 5:39 PM MST for Pima County, Arizona. It was in force for 85 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 21, 2012, 5:39 PM MST (00:39 UTC)
Expired: Aug 21, 2012, 7:04 PM MST
In force: 85 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 104 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

Phoenix, AZ (KPSR), launched 00:00Z, 0.7 hours before the alert went out and 208 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: 565 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 2143 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 30 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.

563 
WGUS55 KTWC 220039
FFWTWC
AZC019-220230-
/O.NEW.KTWC.FF.W.0042.120822T0039Z-120822T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
539 PM MST TUE AUG 21 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 730 PM MST

* AT 529 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  AN AREA OF STRONG THUNDERSTORMS GENERATING VERY HEAVY RAINFALL
  OVER SOUTHERN PORTIONS OF THE TOHONO O'ODHAM NATION.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH
  KOMELIK...SAN MIGUEL AND CHOULIC

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
VAMORI WASH...CHUTUM VAYA WASH...TOPAWA WASH...BAILEY WASH...AND
BABOQUIVARI WASH.

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.

&&

LAT...LON 3148 11157 3155 11177 3170 11183 3182 11175
      3146 11149

$$

MEYER

2 follow-up statements

502 
WGUS75 KTWC 220119
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
619 PM MST TUE AUG 21 2012

AZC019-220230-
/O.CON.KTWC.FF.W.0042.000000T0000Z-120822T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
619 PM MST TUE AUG 21 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM MST FOR
EXTREME SOUTH CENTRAL PIMA COUNTY...

AT 615 PM MST...SHOWERS AND THUNDERSTORMS WERE SHIFTING FURTHER WEST 
ACROSS SOUTHERN PORTIONS OF THE TOHONO O'ODHAM NATION. RAINFALL 
AMOUNTS IN EXCESS OF 2 INCHES IN SOME LOCATIONS WERE GENERATING 
FLASH FLOODING CONDITIONS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH
KOMELIK...SAN MIGUEL AND CHOULIC

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...VAMORI 
WASH...CHUTUM VAYA WASH...TOPAWA WASH...BAILEY WASH...AND 
BABOQUIVARI WASH.

&&

LAT...LON 3148 11157 3155 11177 3170 11183 3182 11175
      3146 11149

$$

MEYER

948 
WGUS75 KTWC 220204
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
704 PM MST TUE AUG 21 2012

AZC019-220213-
/O.CAN.KTWC.FF.W.0042.000000T0000Z-120822T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
704 PM MST TUE AUG 21 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME SOUTH
CENTRAL PIMA COUNTY...

AT 700 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR HAD INDICATED 
THAT THE THUNDERSTORM RESPONSIBLE FOR HEAVY RAINFALL OVER THE 
WARNING AREA HAD MOVED WEST OF THE WARNED AREA. WITH THE THREAT FOR 
HEAVY RAINFALL ENDED...THERE IS MINIMAL CONCERN FOR FLASH FLOODING 
OVER THE AREA. THUS...THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3148 11157 3155 11177 3170 11183 3182 11175
      3146 11149

$$

SMR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 5:03 PM MST	Special Weather Statement	TWC	Pinal	57 min
Aug 21, 5:21 PM MST	Special Weather Statement	TWC	Pinal	39 min
Aug 21, 5:37 PM MST	Flash Flood Warning	TWC	Pinal	83 min
Aug 21, 5:45 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Aug 21, 5:48 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Aug 21, 5:53 PM MST	Special Weather Statement	TWC	Pinal	52 min
Aug 21, 6:38 PM MST	Flash Flood Warning	TWC	Pima	112 min
Aug 21, 6:47 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Aug 21, 6:55 PM MST	Severe Thunderstorm Warning	TWC	Pima	50 min
Aug 21, 7:13 PM MST	Areal Flood Advisory	TWC	Pima	6 hr
Aug 21, 7:51 PM MST	Flash Flood Warning	TWC	Pima	114 min
Aug 21, 8:31 PM MST	Special Weather Statement	TWC		44 min
Aug 21, 10:29 PM MST	Areal Flood Warning	TWC	Pima	3 hr
Aug 22, 2:12 AM MST	Areal Flood Warning	TWC	Pima	12 hr
Aug 22, 3:08 AM MST	Flash Flood Watch	TWC	Cochise, Pima, Pinal, Santa Cruz	17 hr
Aug 22, 9:35 AM MST	Areal Flood Advisory	TWC	Cochise, Graham, Pima, Pinal, Santa Cruz	3 hr
Aug 22, 2:28 PM MST	Areal Flood Warning	TWC	Pima, Pinal	7 hr

Nearby

Flash Flood Warnings in Arizona, 2012 Every flash flood warning in 2012

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.