Alert archive / Arizona / Areal Flood Warnings in 2021

Areal Flood Warning 13, NWS Tucson, AZ

July 25, 2021Pima County, Arizona

NWS Tucson, AZ issued this areal flood warning at Jul 25, 2021, 8:52 AM MST for Pima County, Arizona. It was in force for 9 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 25, 2021, 8:52 AM MST (15:52 UTC)
Expired: Jul 25, 2021, 5:45 PM MST
In force: 9 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 158 km from the middle of the area, began a volume at 15:51 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 (KTUS), launched 12:00Z, 3.9 hours before the alert went out and 135 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: 151 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 521 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

190 
WGUS45 KTWC 251552
FLWTWC

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Tucson AZ
852 AM MST Sun Jul 25 2021

AZC019-260045-
/O.NEW.KTWC.FA.W.0013.210725T1552Z-210726T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
852 AM MST Sun Jul 25 2021

The National Weather Service in Tucson has issued a

* Flood Warning for...
  Central Pima County in southeastern Arizona...

* Until 545 PM MST Sunday.

* At 852 AM MST, Heavy rainfall over the past few days has led to 
  excessive flow in the Vamori Wash on the Tohono O'odham Nation. At 
  Kom Vo, the stage remained at 9.6 ft and has plateaued.

* Some locations that will experience flooding include...
  Santa Cruz.

This includes the following streams and drainages...
  Gu Vo Wash, Hali Murk Wash, San Simon Wash and Vamori Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Remain alert for flooding even in locations not receiving rain. 
Washes, streams, and rivers can become raging killer currents in a 
matter of minutes, even from distant rainfall.

&&

LAT...LON 3193 11235 3193 11237 3195 11237 3196 11236
      3198 11233 3197 11228 3195 11221 3193 11221
      3193 11222 3195 11227 3196 11231 3196 11233

$$

WJM

1 follow-up statement

913 
WGUS85 KTWC 260041
FLSTWC

Flood Statement
National Weather Service Tucson AZ
541 PM MST Sun Jul 25 2021

AZC019-260051-
/O.EXP.KTWC.FA.W.0013.000000T0000Z-210726T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
541 PM MST Sun Jul 25 2021

...FLOOD WARNING WILL EXPIRE AT 545 PM MST THIS AFTERNOON FOR 
CENTRAL PIMA COUNTY...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3193 11235 3193 11237 3195 11237 3196 11236
      3198 11233 3197 11228 3195 11221 3193 11221
      3193 11222 3195 11227 3196 11231 3196 11233

$$

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 9:25 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 24, 9:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 24, 9:58 PM MST	Areal Flood Advisory	TWC	Cochise, Pima	3 hr
Jul 25, 12:53 AM MST	Areal Flood Warning	TWC	Pima	8 hr
Jul 25, 3:14 AM MST	Areal Flood Warning	TWC	Pima	3 hr
Jul 25, 3:25 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 25, 4:15 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	5 hr
Jul 25, 6:27 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	4 hr
Jul 25, 9:09 AM MST	Areal Flood Advisory	TWC	Cochise, Pima, Pinal	7 hr
Jul 25, 9:24 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 25, 9:53 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 25, 9:55 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 25, 10:22 AM MST	Areal Flood Warning	TWC	Pima, Pinal	6 hr
Jul 25, 10:31 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 25, 11:39 AM MST	Areal Flood Advisory	TWC	Santa Cruz	4 hr
Jul 25, 1:36 PM MST	Flash Flood Warning	TWC	Pima	114 min
Jul 25, 1:42 PM MST	Special Weather Statement	TWC		63 min
Jul 25, 2:00 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 25, 3:07 PM MST	Areal Flood Warning	TWC	Santa Cruz	12 hr
Jul 25, 3:34 PM MST	Areal Flood Advisory	TWC	Pima	116 min
Jul 25, 4:15 PM MST	Areal Flood Warning	TWC	Pima, Pinal	43 hr
Jul 25, 4:49 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr

Nearby

Areal Flood Warnings in Arizona, 2021 Every areal flood warning in 2021

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.