Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 79, NWS Tucson, AZ

September 10, 2012Pima County, Santa Cruz County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 10, 2012, 4:13 PM MST for Pima County, Santa Cruz 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
Sep 10, 2012, 4:13 PM MST (23:13 UTC)
Expired
Sep 10, 2012, 6:15 PM MST
In force
2 hr
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

Counties Pima County, AZ, Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 64 km from the middle of the area, began a volume at 23:16 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 12:00Z, 11.2 hours before the alert went out and 51 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 12:00Z on 2012-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 773 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 12:00Z on 2012-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
773 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
1076 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

994 
WGUS55 KTWC 102313
FFWTWC
AZC019-023-110115-
/O.NEW.KTWC.FF.W.0079.120910T2313Z-120911T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
413 PM MST MON SEP 10 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  WESTERN SANTA CRUZ COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 615 PM MST

* AT 406 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
HEAVY RAINFALL FROM NUMEROUS THUNDERSTORMS FROM THE RYAN FIELD AREA 
SOUTHWARD THROUGH ARIVACA. AN ADDITIONAL ONE TO TWO INCHES OF 
RAINFALL IS POSSIBLE WITH SOME OF THESE STORMS. THERE HAS ALREADY 
BEEN LOCALLY TWO TO THREE INCHES OF RAINFALL ACROSS THE SOUTHWEST 
SIDE OF TUCSON WHICH CONTINUES TO PRODUCE FLASH FLOODING ALONG 
VALENCIA ROAD. THIS FLASH FLOOD WARNING EXPANDS AND REPLACES THE 
PREVIOUS FLASH FLOOD WARNING EXPIRING AT 415 PM.  

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN XAVIER
  MISSION...SAGUARO NATIONAL PARK WEST AND RYAN FIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

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 3194 11149 3236 11130 3221 11101 3195 11101
      3138 11119 3149 11152 3174 11148

$$

GL
1 follow-up statement
788 
WGUS75 KTWC 110117
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
617 PM MST MON SEP 10 2012

AZC019-023-110126-
/O.EXP.KTWC.FF.W.0079.000000T0000Z-120911T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CRUZ AZ-PIMA AZ-
617 PM MST MON SEP 10 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR EASTERN PIMA AND WESTERN
SANTA CRUZ COUNTIES...

AT 615 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR HAD INDICATED 
THAT THE THREAT OF HEAVY RAINFALL FOR THE WARNED AREA HAS ENDED AS 
SHOWERS AND THUNDERSTORMS HAVE DISSIPATED. THUS...THE WARNING WAS 
ALLOWED TO EXPIRE.

LAT...LON 3194 11149 3236 11130 3221 11101 3195 11101
      3138 11119 3149 11152 3174 11148

$$

SMR

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 6:49 PM MSTAreal Flood WarningTWCPima18 hr
Sep 9, 11:55 PM MSTAreal Flood AdvisoryTWCPima, Pinal3 hr
Sep 10, 12:46 PM MSTAreal Flood WarningTWCPima30 hr
Sep 10, 1:27 PM MSTFlash Flood WarningTWCSanta Cruz2 hr
Sep 10, 1:37 PM MSTAreal Flood AdvisoryTWCCochise, Pima, Santa Cruz3 hr
Sep 10, 2:24 PM MSTFlash Flood WarningTWCCochise111 min
Sep 10, 2:29 PM MSTAreal Flood AdvisoryTWCPima3 hr
Sep 10, 2:41 PM MSTFlash Flood WarningTWCPima94 min
Sep 10, 3:40 PM MSTAreal Flood AdvisoryTWCCochise, Graham80 min
Sep 10, 3:44 PM MSTSpecial Weather StatementTWCPima46 min
Sep 10, 3:49 PM MSTSpecial Weather StatementTWCPima41 min
Sep 10, 3:53 PM MSTSevere Thunderstorm WarningTWCPima37 min
Sep 10, 3:54 PM MSTFlash Flood WarningTWCPima2 hr
Sep 10, 4:24 PM MSTSevere Thunderstorm WarningTWCPima36 min
Sep 10, 4:56 PM MSTAreal Flood AdvisoryTWCGraham, Pinal112 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.