Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 14, NWS Tucson, AZ

July 16, 2012Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 16, 2012, 8:09 PM MST for Pima County, Arizona. It was in force for 111 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
Jul 16, 2012, 8:09 PM MST (03:09 UTC)
Expired
Jul 16, 2012, 10:00 PM MST
In force
111 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 38 km from the middle of the area, began a volume at 03:10 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 (KTUS), launched 00:00Z, 3.2 hours before the alert went out and 2 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 2012-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 646 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 2012-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
646 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
2318 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
52 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.

401 
WGUS55 KTWC 170309
FFWTWC
AZC019-170500-
/O.NEW.KTWC.FF.W.0014.120717T0309Z-120717T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
809 PM MST MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
   INCLUDING THE SOUTHERN PORTIONS OF THE TUCSON METRO AREA

* UNTIL 1000 PM MST

* AT 800 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM OVER THE SOUTHERN PORTIONS OF THE TUCSON
  METRO AREA HAS PRODUCED VERY HEAVY RAINFALL. RADAR ESTIMATED THAT 
  BETWEEN 1.00 AND 1.50 INCHES HAD FALLEN ALONG VALENCIA NEAR THE 
  TUCSON INTERNATIONAL AIRPORT...AND AROUND 1.00 TO 1.25 INCHES 
  NEAR INTERSTATE 10 BETWEEN VALENCIA AND WILMOT ROAD. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DAVIS-MONTHAN AIR FORCE BASE.

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.

&&

LAT...LON 3216 11099 3228 11082 3211 11068 3203 11102

$$
2 follow-up statements
933 
WGUS75 KTWC 170441
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
941 PM MST MON JUL 16 2012

AZC019-170500-
/O.CON.KTWC.FF.W.0014.000000T0000Z-120717T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
941 PM MST MON JUL 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM MST FOR EAST
CENTRAL PIMA COUNTY...

ALTHOUGH THE STORMS HAVE SINCE DISSIPATED...WEATHER SERVICE RADAR 
ESTIMATED THAT BETWEEN 1.00 AND 1.50 INCHES HAD FALLEN ALONG 
VALENCIA NEAR THE TUCSON INTERNATIONAL AIRPORT...AND AROUND 1.00 TO 
1.25 INCHES NEAR INTERSTATE 10 BETWEEN VALENCIA AND WILMOT ROADS. 

WILMOT ROAD IS CLOSED BETWEEN INTERSTATE 10 AND HERMANS ROAD DUE TO 
FLOODING IN THE ROADWAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3216 11099 3228 11082 3211 11068 3203 11102

$$
970 
WGUS75 KTWC 170500
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1000 PM MST MON JUL 16 2012

AZC019-170510-
/O.EXP.KTWC.FF.W.0014.000000T0000Z-120717T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIMA AZ-
1000 PM MST MON JUL 16 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR EAST CENTRAL PIMA
COUNTY...

ALTHOUGH SIGNIFICANT PONDING OF WATER IS LIKELY TO PERSIST...THE 
THREAT OF FLASH FLOODING HAS SUBSIDED. THEREFORE...THE FLASH FLOOD 
WARNING HAS BEEN ALLOWED TO EXPIRE AT 10 PM MST.

LAT...LON 3216 11099 3228 11082 3211 11068 3203 11102

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 7:07 PM MSTAreal Flood AdvisoryTWCCochise83 min
Jul 16, 7:19 PM MSTFlash Flood WarningTWCCochise116 min
Jul 16, 7:54 PM MSTSevere Thunderstorm WarningTWCPima51 min
Jul 16, 9:22 PM MSTFlash Flood WarningTWCCochise3 hr
Jul 17, 2:05 PM MSTFlash Flood WarningTWCCochise, Santa Cruz55 min
Jul 17, 3:51 PM MSTAreal Flood AdvisoryTWCCochise3 hr

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.