Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 35, NWS Tucson, AZ

August 19, 2012Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 19, 2012, 7:19 PM MST for Pima County, Pinal County, Arizona. It was in force for 86 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, 7:19 PM MST (02:19 UTC)
Expired
Aug 19, 2012, 8:45 PM MST
In force
86 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

Counties Pima County, AZ, Pinal County, AZ

The radar

The Tucson radar (KEMX), 54 km from the middle of the area, began a volume at 02:20 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, 2.3 hours before the alert went out and 16 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-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 2012-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 309 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 2012-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

844 
WGUS55 KTWC 200219
FFWTWC
AZC019-021-200345-
/O.NEW.KTWC.FF.W.0035.120820T0219Z-120820T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

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...
  EXTREME SOUTHEASTERN PINAL COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 845 PM MST

* AT 712 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A CLUSTER OF THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING     
  MOVING INTO THE TUCSON METRO AREA FROM THE WEST AND NORTHWEST. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SEVEN
  FALLS...SABINO CANYON...REDINGTON...MOUNT LEMMON/SUMMERHAVEN...DOVE
  MOUNTAIN...CATALINA STATE PARK...CATALINA FOOTHILLS 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 3250 11124 3252 11046 3199 11046 3208 11109

$$

MOLLERE
1 follow-up statement
555 
WGUS75 KTWC 200306
FFSTWC

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

AZC019-021-200345-
/O.CON.KTWC.FF.W.0035.000000T0000Z-120820T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-PINAL AZ-
806 PM MST SUN AUG 19 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST FOR
EXTREME SOUTHEASTERN PINAL AND NORTHEASTERN PIMA COUNTIES...

AT 800 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE TUCSON 
METRO AREA. A TRAINED SPOTTER NEAR FORT LOWELL AND ALVERNON REPORTED 
1.35 INCHES OF RAIN IN ABOUT 20 MINUTES. FLASH FLOODING IS LIKELY TO 
OCCUR WITH THIS STORM. 

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.

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 3250 11124 3252 11046 3199 11046 3208 11109

$$

MOLLERE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 5:05 PM MSTAreal Flood AdvisoryTWCCochise85 min
Aug 19, 5:11 PM MSTSpecial Weather StatementTWCCochise49 min
Aug 19, 5:13 PM MSTSevere Thunderstorm WarningTWCCochise47 min
Aug 19, 5:31 PM MSTSevere Thunderstorm WarningTWCCochise59 min
Aug 19, 5:59 PM MSTAreal Flood AdvisoryTWCCochise91 min
Aug 19, 6:19 PM MSTAreal Flood AdvisoryTWCGraham, Pinal86 min
Aug 19, 6:37 PM MSTSevere Thunderstorm WarningTWCGraham, Pinal23 min
Aug 19, 7:01 PM MSTSpecial Weather StatementTWC44 min
Aug 19, 7:11 PM MSTSevere Thunderstorm WarningTWCPima, Pinal49 min
Aug 19, 7:56 PM MSTSevere Thunderstorm WarningTWCPima49 min
Aug 19, 8:47 PM MSTFlash Flood WarningTWCPima, Pinal103 min
Aug 19, 8:58 PM MSTFlash Flood WarningTWCPima2 hr
Aug 19, 9:25 PM MSTAreal Flood AdvisoryTWCPima, Pinal2 hr
Aug 19, 10:56 PM MSTFlash Flood WarningTWCPima64 min
Aug 20, 4:45 PM MSTAreal Flood AdvisoryTWCPima, Santa Cruz79 min

Nearby

Flash Flood Warnings in Arizona, 2012Every 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.