Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 56, NWS Tucson, AZ

August 3, 2017Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 3, 2017, 4:24 PM MST for Pima 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: Aug 3, 2017, 4:24 PM MST (23:24 UTC)
Expired: Aug 3, 2017, 6:30 PM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 82 km from the middle of the area, began a volume at 23:25 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, 11.4 hours before the alert went out and 43 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: 975 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

166 
WGUS55 KTWC 032324
FFWTWC
AZC019-040130-
/O.NEW.KTWC.FF.W.0056.170803T2324Z-170804T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
424 PM MST THU AUG 3 2017

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  North central Pima County in southeastern Arizona...

* Until 630 PM MST

* At 423 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over Avra Valley. The thunderstorms were nearly 
  stationary. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Marana, Avra Valley and Picture Rocks. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3250 11115 3229 11118 3227 11139 3249 11141

$$

Zell

2 follow-up statements

882 
WGUS75 KTWC 040019
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
519 PM MST THU AUG 3 2017

AZC019-040130-
/O.CON.KTWC.FF.W.0056.000000T0000Z-170804T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
519 PM MST THU AUG 3 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST FOR
NORTH CENTRAL PIMA COUNTY...

At 512 PM MST, Doppler radar indicated that the thunderstorms had 
dissipated, with only light rainfall still occurring in the area. 
Radar rainfall estimates indicate that between 1.0-1.5 inches of 
rainfall had occurred with the thunderstorms in this area. Flooding 
of area roads is expected to continue. 

Normally dry washes and low water crossings may be inundated in the
following locations...
Marana, Avra Valley and Picture Rocks. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3250 11115 3229 11118 3227 11139 3249 11141

$$

Zell

186 
WGUS75 KTWC 040123
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
623 PM MST THU AUG 3 2017

AZC019-040132-
/O.EXP.KTWC.FF.W.0056.000000T0000Z-170804T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
623 PM MST THU AUG 3 2017

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

The heavy rain has ended. However ponding on areas roadways will 
likely linger into the early evening hours. Please continue to heed 
any road closures.

LAT...LON 3250 11115 3229 11118 3227 11139 3249 11141

$$

LEINS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 6:48 PM MST	Special Weather Statement	TWC	Graham	42 min
Aug 3, 1:07 PM MST	Special Weather Statement	TWC	Santa Cruz	23 min
Aug 3, 1:39 PM MST	Areal Flood Advisory	TWC	Graham	111 min
Aug 3, 2:10 PM MST	Special Weather Statement	TWC		50 min
Aug 3, 2:11 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 3, 2:20 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Aug 3, 2:47 PM MST	Special Weather Statement	TWC	Cochise	43 min
Aug 3, 3:03 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Aug 3, 3:18 PM MST	Special Weather Statement	TWC	Pinal	42 min
Aug 3, 3:26 PM MST	Flash Flood Warning	TWC	Pima	3 hr
Aug 3, 3:45 PM MST	Areal Flood Advisory	TWC	Pinal	3 hr
Aug 3, 4:07 PM MST	Special Weather Statement	TWC	Pinal	53 min
Aug 3, 4:13 PM MST	Special Weather Statement	TWC		47 min

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.