Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS Tucson, AZ

July 15, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 15, 2021, 6:33 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 15, 2021, 6:33 AM MST (13:33 UTC)
Expired: Jul 15, 2021, 9:45 AM 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 Tucson radar (KEMX), 96 km from the middle of the area, began a volume at 13:35 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, 1.6 hours before the alert went out and 64 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: 1024 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1408 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

992 
WGUS55 KTWC 151333
FFWTWC
AZC019-151645-
/O.NEW.KTWC.FF.W.0028.210715T1333Z-210715T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
633 AM MST Thu Jul 15 2021

The National Weather Service in Tucson has issued a

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

* Until 945 AM MST.

* At 633 AM MST, Doppler radar indicated showers and thunderstorms 
  producing heavy rain across the warned area. Between 1 and 2 
  inches of rain have fallen. 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...
  Marana, Three Points, Avra Valley, San Isidro, Tucson Estates, 
  Picture Rocks, San Pedro, Queens Well, South Comobabi, Santa Rosa 
  Ranch, Sil Nakya and Pan Tak.

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.

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 3228 11185 3192 11174 3208 11120 3243 11125

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

$$

JG

2 follow-up statements

337 
WGUS75 KTWC 151502
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
802 AM MST Thu Jul 15 2021

AZC019-151645-
/O.CON.KTWC.FF.W.0028.000000T0000Z-210715T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
802 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 AM MST THIS 
MORNING FOR NORTH CENTRAL PIMA COUNTY...

At 802 AM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen with isolated areas of 3 inches. Additional rainfall amounts 
up to 1 inch 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...
  Marana, Three Points, Avra Valley, San Isidro, Tucson Estates, 
  Picture Rocks, San Pedro, Queens Well, South Comobabi, Santa Rosa 
  Ranch, Sil Nakya and Pan Tak.

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.

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 3228 11185 3192 11174 3208 11120 3243 11125

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

$$

AH

911 
WGUS75 KTWC 151636
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
936 AM MST Thu Jul 15 2021

AZC019-151646-
/O.EXP.KTWC.FF.W.0028.000000T0000Z-210715T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
936 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 945 AM MST THIS MORNING 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 Thursday for 
a portion of Southeast Arizona.

LAT...LON 3228 11185 3192 11174 3208 11120 3243 11125

$$

AH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:33 PM MST	Special Weather Statement	TWC		27 min
Jul 14, 5:41 PM MST	Special Weather Statement	TWC		49 min
Jul 15, 6:07 AM MST	Areal Flood Advisory	TWC	Pima	113 min
Jul 15, 8:12 AM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 15, 8:32 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 15, 8:40 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	114 min
Jul 15, 1:51 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 15, 1:55 PM MST	Special Weather Statement	TWC	Greenlee	35 min
Jul 15, 2:19 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	41 min
Jul 15, 2:31 PM MST	Areal Flood Advisory	TWC	Cochise	119 min
Jul 15, 2:52 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 min
Jul 15, 3:15 PM MST	Severe Thunderstorm Warning	TWC	Graham	45 min
Jul 15, 3:30 PM MST	Areal Flood Advisory	TWC	Graham, Greenlee	3 hr
Jul 15, 3:57 PM MST	Severe Thunderstorm Warning	TWC	Graham	33 min
Jul 15, 4:29 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	2 hr
Jul 15, 4:42 PM MST	Special Weather Statement	TWC	Graham	33 min

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.