Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 45, NWS Tucson, AZ

July 29, 2017Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 29, 2017, 2:41 PM MST for Pima County, Arizona. It was in force for 3 hr. 2 reports 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: Jul 29, 2017, 2:41 PM MST (21:41 UTC)
Expired: Jul 29, 2017, 5:45 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 48 km from the middle of the area, began a volume at 21:45 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
Jul 29, 4:45 PM MST	FLASH FLOOD	7 Ese Saguaro National, AZ	RINCON CREEK AT RINCON GAUGE RECORDED A CREST OF 9.32 FEET. THIS IS THE 4TH HIGHEST ON RECORD FOR THIS SITE.
Jul 29, 5:00 PM MST	FLASH FLOOD	12 Ne Tucson, AZ	FLASH FLOOD NEAR SEVEN FALLS. SEVEN PEOPLE WERE TRAPPED IN THE CANYON AND WERE TRANSPORTED OUT VIA HELICOPTER.

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

The nearest sounding before it

Tuscon, AZ (KDMA), launched 12:00Z, 9.7 hours before the alert went out and 17 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: 212 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1399 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

970 
WGUS55 KTWC 292141
FFWTWC
AZC019-300045-
/O.NEW.KTWC.FF.W.0045.170729T2141Z-170730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
241 PM MST SAT JUL 29 2017

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  Northeastern Pima County in southeastern Arizona...

* Until 545 PM MST

* At 241 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across much of the central, eastern and northeast 
  portions of the Tucson area. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Tucson, Oro Valley, Flowing Wells, Casas Adobes, Tanque Verde, Rita
  Ranch, Catalina Foothills, Sabino Canyon, Seven Falls and Saguaro
  National Park East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3238 11055 3208 11064 3213 11087 3226 11084
      3228 11101 3233 11104 3237 11097 3238 11083
      3242 11078

$$

GL

2 follow-up statements

745 
WGUS75 KTWC 292312
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
412 PM MST SAT JUL 29 2017

AZC019-300045-
/O.CON.KTWC.FF.W.0045.000000T0000Z-170730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
412 PM MST SAT JUL 29 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST FOR
NORTHEASTERN PIMA COUNTY...

At 411 PM MST, Doppler radar indicated thunderstorms have ended over 
the warning area. Flash flooding is ongoing or expected to begin 
shortly in area washes. 

Normally dry washes and low water crossings may be inundated in the
following locations...
Tucson, Oro Valley, Flowing Wells, Casas Adobes, Tanque Verde, Rita
Ranch, Catalina Foothills, Sabino Canyon, Seven Falls and Saguaro
National Park East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3238 11055 3208 11064 3213 11087 3226 11084
      3228 11101 3233 11104 3237 11097 3238 11083
      3242 11078

$$

GL

146 
WGUS75 KTWC 300041
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
541 PM MST SAT JUL 29 2017

AZC019-300050-
/O.EXP.KTWC.FF.W.0045.000000T0000Z-170730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
541 PM MST SAT JUL 29 2017

...THE FLASH FLOOD WARNING FOR NORTHEASTERN PIMA COUNTY WILL EXPIRE
AT 545 PM MST...

The heavy rain has ended. However, significant flow will continue in 
area washes and a small stream flood advisory is now in effect 
across the area until 1145 PM MST. Please continue to heed any 
remaining road closures.

LAT...LON 3238 11055 3208 11064 3213 11087 3226 11084
      3228 11101 3233 11104 3237 11097 3238 11083
      3242 11078

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 5:08 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 28, 5:22 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 28, 5:29 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 28, 5:36 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 28, 5:40 PM MST	Special Weather Statement	TWC	Cochise	35 min
Jul 28, 5:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	35 min
Jul 28, 6:23 PM MST	Flash Flood Warning	TWC	Cochise	112 min
Jul 28, 6:55 PM MST	Special Weather Statement	TWC	Cochise	35 min
Jul 28, 7:04 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 28, 7:31 PM MST	Areal Flood Advisory	TWC	Graham	3 hr
Jul 28, 8:48 PM MST	Areal Flood Advisory	TWC	Graham	117 min
Jul 28, 9:09 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 28, 9:19 PM MST	Areal Flood Advisory	TWC	Pima	116 min
Jul 28, 10:48 PM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 28, 11:16 PM MST	Flash Flood Warning	TWC	Pima	119 min
Jul 29, 11:22 AM MST	Areal Flood Advisory	TWC	Pima	113 min
Jul 29, 11:29 AM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 29, 12:26 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 29, 1:09 PM MST	Flash Flood Warning	TWC	Santa Cruz	3 hr
Jul 29, 1:45 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 29, 1:50 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 29, 2:19 PM MST	Flash Flood Warning	TWC	Pima	116 min
Jul 29, 3:15 PM MST	Special Weather Statement	TWC	Cochise	45 min
Jul 29, 3:24 PM MST	Special Weather Statement	TWC	Cochise	36 min
Jul 29, 3:37 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 29, 3:57 PM MST	Special Weather Statement	TWC	Cochise	33 min
Jul 29, 4:30 PM MST	Special Weather Statement	TWC		45 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.