Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 47, NWS Tucson, AZ

July 30, 2017Graham County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 30, 2017, 1:17 PM MST for Graham County, Arizona. It was in force for 3 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: Jul 30, 2017, 1:17 PM MST (20:17 UTC)
Expired: Jul 30, 2017, 4:15 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Graham County, AZ

The radar

The Tucson radar (KEMX), 129 km from the middle of the area, began a volume at 20:16 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 (KDMA), launched 12:00Z, 8.3 hours before the alert went out and 126 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: 1621 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

662 
WGUS55 KTWC 302017
FFWTWC
AZC009-302315-
/O.NEW.KTWC.FF.W.0047.170730T2017Z-170730T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
117 PM MST SUN JUL 30 2017

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  South central Graham County in southeastern Arizona...

* Until 415 PM MST

* At 114 PM MST, Doppler radar and automated rain gauges indicated
  heavy rain falling across the warned area. Flash flooding is 
  already occurring and flowing down Ash canyon and likely Frye 
  canyon. This is a dangerous situation and the flow may go all the 
  way to the Gila River. 

* Some locations that will experience flooding include...
  Safford, Thatcher, Pima and Frye Mesa Dam. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 3285 10969 3270 10979 3279 11000 3294 10987

$$

Cerniglia

1 follow-up statement

210 
WGUS75 KTWC 302306
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
406 PM MST SUN JUL 30 2017

AZC009-302315-
/O.EXP.KTWC.FF.W.0047.000000T0000Z-170730T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Graham-
406 PM MST SUN JUL 30 2017

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL GRAHAM COUNTY WILL
EXPIRE AT 415 PM MST...

The heavy rain has ended. Flood waters have receded, though some 
flow will continue into the evening. Please continue to heed any 
remaining road closures.

LAT...LON 3285 10969 3270 10979 3279 11000 3294 10987

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:40 PM MST	Areal Flood Advisory	TWC	Pima	6 hr
Jul 29, 6:49 PM MST	Special Weather Statement	TWC	Greenlee	41 min
Jul 29, 8:14 PM MST	Severe Thunderstorm Warning	TWC	Graham	31 min
Jul 29, 8:34 PM MST	Areal Flood Advisory	TWC	Graham	116 min
Jul 30, 11:36 AM MST	Flash Flood Warning	TWC	Graham	3 hr
Jul 30, 1:09 PM MST	Areal Flood Advisory	TWC	Cochise, Graham, Pinal	3 hr
Jul 30, 1:40 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 30, 1:55 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 30, 1:57 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 30, 3:08 PM MST	Flash Flood Warning	TWC	Pima	5 hr
Jul 30, 3:34 PM MST	Areal Flood Advisory	TWC	Pima	3 hr

Nearby

Flash Flood Warnings in Arizona, 2017 Every flash flood warning in 2017

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.