Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 37, NWS Tucson, AZ

August 19, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 19, 2012, 8:58 PM MST for Pima County, Arizona. It was in force for 2 hr. 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, 8:58 PM MST (03:58 UTC)
Expired: Aug 19, 2012, 11:00 PM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 117 km from the middle of the area, began a volume at 04:00 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, 4.0 hours before the alert went out and 104 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.

789 
WGUS55 KTWC 200358
FFWTWC
AZC019-200600-
/O.NEW.KTWC.FF.W.0037.120820T0358Z-120820T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
858 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 1100 PM MST

* AT 849 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  RAINFALL ESTIMATES OF OVER 2 INCHES SOUTHWEST OF SANTA ROSA AND 
  NORTH OF COVERED WELLS. WASHES AFFECTED BY THE HEAVY RAIN INCLUDE 
  SANTA ROSA WASH...ANEGAM WASH AND THE SIL NAKYA WASH...JUST TO NAME
  A FEW. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VENTANA AND
  ANEGAM.

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.

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.

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 3210 11172 3215 11241 3250 11227 3250 11185

$$

2 follow-up statements

845 
WGUS75 KTWC 200418
FFSTWC

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

AZC019-200600-
/O.CON.KTWC.FF.W.0037.000000T0000Z-120820T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
918 PM MST SUN AUG 19 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM MST FOR
CENTRAL PIMA COUNTY...

AT 913 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA. ROADS HAVE BEEN REPORTED TO BE IMPASSABLE DUE TO FLOODING 
OVER ROADWAYS.

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

LAT...LON 3210 11172 3215 11241 3250 11227 3250 11185

$$

523 
WGUS75 KTWC 200532
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1032 PM MST SUN AUG 19 2012

AZC019-200600-
/O.CON.KTWC.FF.W.0037.000000T0000Z-120820T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
1032 PM MST SUN AUG 19 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM MST FOR
CENTRAL PIMA COUNTY...

AT 1027 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM CAPABLE OF PRODUCING FLASH FLOODING OVER THE 
WARNED AREA.

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

LAT...LON 3213 11212 3228 11222 3240 11220 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, 9:25 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Aug 19, 10:56 PM MST	Flash Flood Warning	TWC	Pima	64 min
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.