Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 55, NWS Tucson, AZ

August 23, 2011Greenlee County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 23, 2011, 5:25 PM MST for Greenlee County, Arizona. It was in force for 65 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 23, 2011, 5:25 PM MST (00:25 UTC)
Expired: Aug 23, 2011, 6:30 PM MST
In force: 65 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Greenlee County, AZ

The radar

The Tucson radar (KEMX), 180 km from the middle of the area, began a volume at 00:26 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.

What was reported inside it

Time	Report	Where	Remark
Aug 23, 5:50 PM MST	FLASH FLOOD	Clifton, AZ	FLOODING IN WARD CANYON ONGOING WITH DAMAGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 0.4 hours before the alert went out and 179 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 4405 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 38 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.

164 
WGUS55 KTWC 240025
FFWTWC
AZC011-240130-
/O.NEW.KTWC.FF.W.0055.110824T0025Z-110824T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
525 PM MST TUE AUG 23 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL GREENLEE COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 630 PM MST

* AT 520 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES 
  A STRONG THUNDERSTORM OVER CLIFTON PRODUCING VERY HEAVY RAINFALL. 
  THE THUNDERSTORM WAS MOVING WEST AT 10 MPH.

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 3308 10947 3321 10934 3317 10909 3297 10913
      3289 10934

$$
ZELL

2 follow-up statements

784 
WGUS75 KTWC 240053
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
553 PM MST TUE AUG 23 2011

AZC011-240130-
/O.CON.KTWC.FF.W.0055.000000T0000Z-110824T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GREENLEE AZ-
553 PM MST TUE AUG 23 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST FOR
CENTRAL GREENLEE COUNTY...

AT 550 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A STRONG THUNDERSTORM OVER CLIFTON PRODUCING VERY HEAVY 
RAINFALL. LOCAL LAW ENFORCEMENT REPORTED FLOODING IN WARD CANYON. 
THIS STORM WAS MOVING WEST AT 10 MPH.

THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTY.

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. MOVE TO HIGHER GROUND.

&&

LAT...LON 3308 10947 3321 10934 3317 10909 3297 10913
      3289 10934

$$
ZELL

311 
WGUS75 KTWC 240130
FFSTWC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
630 PM MST TUE AUG 23 2011

AZC011-240139-
/O.EXP.KTWC.FF.W.0055.000000T0000Z-110824T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GREENLEE AZ-
630 PM MST TUE AUG 23 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MST FOR CENTRAL
GREENLEE COUNTY...

AT 625 PM MST...NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE 
HEAVY PRECIPITATION HAD COME TO AN END ACROSS CENTRAL GREENLEE 
COUNTY...WITH ONLY LIGHT RAINFALL IN THE WARNING AREA. THEREFORE... 
THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE.   

LAT...LON 3308 10947 3321 10934 3317 10909 3297 10913
      3289 10934

$$
ZELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 5:05 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	25 min
Aug 23, 5:30 PM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Aug 23, 5:43 PM MST	Severe Thunderstorm Warning	TWC	Pima	32 min
Aug 23, 5:57 PM MST	Areal Flood Advisory	TWC	Pima	50 min
Aug 23, 6:02 PM MST	Severe Thunderstorm Warning	TWC	Pima	28 min
Aug 23, 7:06 PM MST	Areal Flood Advisory	TWC	Graham	114 min
Aug 24, 1:13 PM MST	Special Weather Statement	TWC	Cochise	32 min
Aug 24, 3:05 PM MST	Special Weather Statement	TWC		40 min
Aug 24, 4:00 PM MST	Special Weather Statement	TWC	Graham	45 min

Nearby

Flash Flood Warnings in Arizona, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.