Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 26, NWS Tucson, AZ

July 14, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 14, 2021, 8:59 AM MST for Pima 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 14, 2021, 8:59 AM MST (15:59 UTC)
Expired: Jul 14, 2021, 12:00 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 107 km from the middle of the area, began a volume at 16:03 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, 4.0 hours before the alert went out and 85 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: 1970 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1522 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

563 
WGUS55 KTWC 141559
FFWTWC
AZC019-141900-
/O.NEW.KTWC.FF.W.0026.210714T1559Z-210714T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
859 AM MST Wed Jul 14 2021

The National Weather Service in Tucson has issued a

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

* Until noon MST.

* At 859 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across eastern sections of the Tohono O'odham Nation in 
  the Sil Nakya area. Up to 2 inches of rain have fallen. Additional 
  rainfall amounts up to 2 inches are possible in the warned area. 
  Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Ak Chin, Queens Well and Sil Nakya.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3251 11176 3249 11167 3240 11155 3232 11148
      3222 11155 3211 11181 3211 11193 3215 11201
      3225 11201 3242 11199 3249 11192

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

GL

2 follow-up statements

367 
WGUS75 KTWC 141736
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1036 AM MST Wed Jul 14 2021

AZC019-141900-
/O.CON.KTWC.FF.W.0026.000000T0000Z-210714T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1036 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL NOON MST TODAY FOR 
NORTH CENTRAL PIMA COUNTY...

At 1036 AM MST, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Up to 2 inches of rain have 
fallen. Additional rainfall amounts up to 1 inch is possible in the 
warned area. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Ak Chin, Queens Well and Sil Nakya.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3251 11176 3249 11167 3240 11155 3232 11148
      3222 11155 3211 11181 3211 11193 3215 11201
      3225 11201 3242 11199 3249 11192

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

TGD

766 
WGUS75 KTWC 141858
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1158 AM MST Wed Jul 14 2021

AZC019-141908-
/O.EXP.KTWC.FF.W.0026.000000T0000Z-210714T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1158 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING WILL EXPIRE AT NOON MST TODAY FOR NORTH 
CENTRAL PIMA COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 PM MST Wednesday 
for a portion of Southeast Arizona.


LAT...LON 3251 11176 3249 11167 3240 11155 3232 11148
      3222 11155 3211 11181 3211 11193 3215 11201
      3225 11201 3242 11199 3249 11192

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:11 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 14, 3:51 AM MST	Areal Flood Advisory	TWC	Pinal	114 min
Jul 14, 4:27 AM MST	Flash Flood Warning	TWC	Pinal	2 hr
Jul 14, 5:56 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Jul 14, 6:28 AM MST	Flash Flood Warning	TWC	Pima, Pinal	3 hr
Jul 14, 6:39 AM MST	Special Weather Statement	TWC	Pinal	51 min
Jul 14, 7:11 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 14, 7:15 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 14, 7:54 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 14, 9:09 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 14, 9:22 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	3 hr
Jul 14, 10:53 AM MST	Areal Flood Advisory	TWC	Pinal	3 hr

Nearby

Flash Flood Warnings in Arizona, 2021 Every flash 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.