Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 45, NWS Tucson, AZ

August 17, 2011Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 17, 2011, 2:29 PM MST for Cochise County, Arizona. It was in force for 91 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 17, 2011, 2:29 PM MST (21:29 UTC)
Expired
Aug 17, 2011, 4:00 PM MST
In force
91 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 124 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 152 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 2011-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 901 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 2011-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
901 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
1550 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
43 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.

979 
WGUS55 KTWC 172129
FFWTWC
AZC003-172300-
/O.NEW.KTWC.FF.W.0045.110817T2129Z-110817T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
229 PM MST WED AUG 17 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL COCHISE COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 400 PM MST

* AT 222 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SHOWERS AND THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL ACROSS THE
  CHIRICAHUA MOUNTAINS. THESE SHOWERS AND THUNDERSTORMS WERE MOVING
  TO THE NORTHWEST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CHIRICAHUA NATIONAL MONUMENT...RUCKER CANYON...CAVE CREEK FLOWING
  INTO PORTAL...AND THE HORSESHOE 2 BURN AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3211 10942 3211 10934 3205 10925 3191 10912
      3175 10918 3158 10936 3173 10947

$$

BF
2 follow-up statements
032 
WGUS75 KTWC 172202
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
302 PM MST WED AUG 17 2011

AZC003-172300-
/O.CON.KTWC.FF.W.0045.000000T0000Z-110817T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCHISE AZ-
302 PM MST WED AUG 17 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM MST FOR EAST
CENTRAL COCHISE COUNTY...

AT 254 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE SCATTERED TO NUMEROUS THUNDERSTORMS PRODUCING VERY HEAVY 
RAIN. THESE THUNDERSTORMS WERE LOCATED NEAR CHIRICAHUA NATIONAL 
MONUMENT...OR 21 MILES WEST OF RODEO...MOVING NORTHWEST AT 10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO   
CHIRICAHUA NATIONAL MONUMENT...RUCKER CANYON...CAVE CREEK FLOWING   
INTO PORTAL...AND THE HORSESHOE 2 BURN AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3211 10942 3211 10934 3205 10925 3191 10912
      3175 10918 3158 10936 3173 10947

$$

BF
385 
WGUS75 KTWC 172300
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
400 PM MST WED AUG 17 2011

AZC003-172307-
/O.EXP.KTWC.FF.W.0045.000000T0000Z-110817T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCHISE AZ-
400 PM MST WED AUG 17 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM MST FOR EAST CENTRAL
COCHISE COUNTY...

AT 400 PM MST...NATIONAL WEATHER SERVICE RADAR INDICATED THAT ONLY A 
FEW LIGHT SHOWERS REMAINED OVER PORTIONS OF THE WARNING AREA IN THE 
CHIRICAHUA MOUNTAINS. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN 
ALLOWED TO EXPIRE. ELEVATED FLOWS IN NORMALLY DRY WASHES WILL 
CONTINUE TO SUBSIDE.  

LAT...LON 3211 10942 3211 10934 3205 10925 3191 10912
      3175 10918 3158 10936 3173 10947

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 12:22 PM MSTAreal Flood AdvisoryTWCCochise83 min
Aug 17, 1:17 PM MSTSpecial Weather StatementTWC43 min
Aug 17, 2:44 PM MSTSevere Thunderstorm WarningTWCSanta Cruz31 min
Aug 17, 3:25 PM MSTAreal Flood AdvisoryTWCPinal80 min
Aug 17, 3:44 PM MSTAreal Flood AdvisoryTWCCochise2 hr
Aug 17, 3:53 PM MSTSevere Thunderstorm WarningTWCCochise37 min
Aug 17, 4:27 PM MSTSevere Thunderstorm WarningTWCCochise33 min
Aug 17, 4:30 PM MSTFlash Flood WarningTWCCochise90 min
Aug 17, 4:57 PM MSTSevere Thunderstorm WarningTWCCochise33 min

Nearby

Flash Flood Warnings in Arizona, 2011Every flash flood warning in 2011

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.