Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 38, NWS Tucson, AZ

August 19, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 19, 2012, 10:56 PM MST for Pima County, Arizona. It was in force for 64 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 19, 2012, 10:56 PM MST (05:56 UTC)
Expired: Aug 20, 2012, 12:00 AM MST
In force: 64 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 116 km from the middle of the area, began a volume at 05:56 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 (KDMA), launched 00:00Z, 5.9 hours before the alert went out and 108 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: 309 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 2678 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 16 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.

208 
WGUS55 KTWC 200556
FFWTWC
AZC019-200700-
/O.NEW.KTWC.FF.W.0038.120820T0556Z-120820T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1056 PM MST SUN AUG 19 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL MIDNIGHT MST

* AT 1051 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SANTA ROSA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF WASHES
AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF
CREEKS AND STREAMS.

&&

LAT...LON 3213 11212 3228 11222 3244 11223 3250 11201
      3250 11185 3210 11172

$$

MEADOWS

2 follow-up statements

855 
WGUS75 KTWC 200627
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1127 PM MST SUN AUG 19 2012

AZC019-200700-
/O.CON.KTWC.FF.W.0038.000000T0000Z-120820T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
1127 PM MST SUN AUG 19 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST FOR
CENTRAL PIMA COUNTY...

AT 1119 PM MST...MOST OF THE RAINFALL HAS DIMINISHED. BOTH OF THE 
RIVER GAGES IN THE WARNED AREA HAVE CRESTED AND BEGUN TO SUBSIDE. 
HOWEVER...WATER MAY STILL BE UP DOWNSTREAM OF THE GAGES AS WELL AS 
ON ROADWAYS...SO FLASH FLOOD THREAT CONTINUES. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SANTA ROSA

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.

&&

LAT...LON 3213 11212 3228 11222 3244 11223 3250 11201
      3250 11185 3210 11172

$$

871 
WGUS75 KTWC 200651
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1151 PM MST SUN AUG 19 2012

AZC019-200700-
/O.EXP.KTWC.FF.W.0038.000000T0000Z-120820T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
1151 PM MST SUN AUG 19 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT MIDNIGHT MST FOR CENTRAL
PIMA COUNTY...

LAT...LON 3213 11212 3228 11222 3244 11223 3250 11201
      3250 11185 3210 11172

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 5:05 PM MST	Areal Flood Advisory	TWC	Cochise	85 min
Aug 19, 5:11 PM MST	Special Weather Statement	TWC	Cochise	49 min
Aug 19, 5:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise	47 min
Aug 19, 5:31 PM MST	Severe Thunderstorm Warning	TWC	Cochise	59 min
Aug 19, 5:59 PM MST	Areal Flood Advisory	TWC	Cochise	91 min
Aug 19, 6:19 PM MST	Areal Flood Advisory	TWC	Graham, Pinal	86 min
Aug 19, 6:37 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	23 min
Aug 19, 7:01 PM MST	Special Weather Statement	TWC		44 min
Aug 19, 7:11 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	49 min
Aug 19, 7:19 PM MST	Flash Flood Warning	TWC	Pima, Pinal	86 min
Aug 19, 7:56 PM MST	Severe Thunderstorm Warning	TWC	Pima	49 min
Aug 19, 8:47 PM MST	Flash Flood Warning	TWC	Pima, Pinal	103 min
Aug 19, 8:58 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Aug 19, 9:25 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Aug 20, 4:45 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	79 min

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.