Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 29, NWS Tucson, AZ

July 23, 2017Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 23, 2017, 3:55 PM MST for Pima County, Arizona. It was in force for 2 hr. 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: Jul 23, 2017, 3:55 PM MST (22:55 UTC)
Expired: Jul 23, 2017, 6:00 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), 73 km from the middle of the area, began a volume at 22:54 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 23, 4:38 PM MST	FLASH FLOOD	7 Wnw Tucson, AZ	SILVERBELL ROAD NEAR SWEETWATER DRIVE IMPASSABLE

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, 10.9 hours before the alert went out and 33 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: 500 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

900 
WGUS55 KTWC 232255
FFWTWC
AZC019-240100-
/O.NEW.KTWC.FF.W.0029.170723T2255Z-170724T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
355 PM MST SUN JUL 23 2017

The National Weather Service in Tucson has issued a

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

* Until 600 PM MST

* At 354 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the northwest side of the Tucson Metro including 
  the Marana, Picture Rocks, Tucson Mountains and Saguaro National 
  Park West areas. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Tucson, Marana, Avra Valley, Flowing Wells, Tucson Estates,
  Tortolita, Casas Adobes, Saguaro National Park West, Picture Rocks
  and Dove Mountain.

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 3250 11109 3237 11107 3228 11101 3211 11132
      3250 11133

$$

GL

2 follow-up statements

007 
WGUS75 KTWC 240003
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
503 PM MST SUN JUL 23 2017

AZC019-240100-
/O.CON.KTWC.FF.W.0029.000000T0000Z-170724T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
503 PM MST SUN JUL 23 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MST FOR
NORTHEASTERN PIMA COUNTY...

At 502 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain have now tapered off across the area.  Flash flooding is 
ongoing across the region.

Normally dry washes and low water crossings may be inundated in the
following locations...
Tucson, Marana, Avra Valley, Flowing Wells, Tucson Estates,
Tortolita, Casas Adobes, Saguaro National Park West, Picture Rocks
and Dove Mountain.

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 3250 11109 3237 11107 3228 11101 3211 11132
      3250 11133

$$

GL

839 
WGUS75 KTWC 240051
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
551 PM MST SUN JUL 23 2017

AZC019-240100-
/O.EXP.KTWC.FF.W.0029.000000T0000Z-170724T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
551 PM MST SUN JUL 23 2017

...THE FLASH FLOOD WARNING FOR NORTHEASTERN PIMA COUNTY WILL EXPIRE
AT 600 PM MST...

The heavy rain has ended. However, residual flooding will continue 
to be an issue. An Urban and Small Stream Flood Advisory will remain 
in effect until 830 PM MST. Please continue to heed any remaining 
road closures.

LAT...LON 3250 11109 3237 11107 3228 11101 3211 11132
      3250 11133

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:06 PM MST	Special Weather Statement	TWC		69 min
Jul 22, 5:21 PM MST	Flash Flood Warning	TWC	Pima	114 min
Jul 22, 5:30 PM MST	Severe Thunderstorm Warning	TWC	Pima	18 min
Jul 22, 5:46 PM MST	Areal Flood Advisory	TWC	Cochise, Graham, Pima, Pinal	3 hr
Jul 22, 6:13 PM MST	Special Weather Statement	TWC		62 min
Jul 22, 6:17 PM MST	Flash Flood Warning	TWC	Pima	88 min
Jul 22, 6:33 PM MST	Flash Flood Warning	TWC	Pima	117 min
Jul 22, 7:20 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	3 hr
Jul 22, 8:27 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 23, 10:43 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	13 hr
Jul 23, 2:46 PM MST	Flash Flood Warning	TWC	Cochise, Pima, Santa Cruz	119 min
Jul 23, 2:51 PM MST	Areal Flood Advisory	TWC	Santa Cruz	114 min
Jul 23, 3:01 PM MST	Severe Thunderstorm Warning	TWC	Pima	29 min
Jul 23, 3:02 PM MST	Flash Flood Warning	TWC	Pima	118 min
Jul 23, 3:12 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 23, 3:35 PM MST	Special Weather Statement	TWC		40 min
Jul 23, 3:47 PM MST	Special Weather Statement	TWC	Graham	58 min
Jul 23, 4:10 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	2 hr
Jul 23, 4:18 PM MST	Severe Thunderstorm Warning	TWC	Graham	42 min
Jul 23, 4:23 PM MST	Flash Flood Warning	TWC	Pima	112 min
Jul 23, 4:24 PM MST	Flash Flood Warning	TWC	Pinal	2 hr
Jul 23, 4:27 PM MST	Severe Thunderstorm Warning	TWC	Pinal	34 min
Jul 23, 4:41 PM MST	Flash Flood Warning	TWC	Graham	2 hr
Jul 23, 4:46 PM MST	Areal Flood Advisory	TWC	Pima	119 min
Jul 23, 4:47 PM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	118 min
Jul 23, 4:59 PM MST	Special Weather Statement	TWC	Pinal	46 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.