Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 21, NWS Tucson, AZ

July 14, 2021Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 14, 2021, 4:27 AM MST for Pinal County, Arizona. It was in force for 2 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, 4:27 AM MST (11:27 UTC)
Expired: Jul 14, 2021, 6:30 AM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pinal County, AZ

The radar

The Tucson radar (KEMX), 83 km from the middle of the area, began a volume at 11:26 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 00:00Z, 11.5 hours before the alert went out and 54 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: 157 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 2978 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

539 
WGUS55 KTWC 141127
FFWTWC
AZC021-141330-
/O.NEW.KTWC.FF.W.0021.210714T1127Z-210714T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  Southeastern Pinal County in southeastern Arizona...

* Until 630 AM MST.

* At 427 AM MST, Doppler radar indicated 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...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Oracle and San Manuel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3268 11070 3261 11079 3256 11075 3264 11065

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

238 
WGUS75 KTWC 141217
FFSTWC

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

AZC021-141330-
/O.CON.KTWC.FF.W.0021.000000T0000Z-210714T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
517 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM MST THIS 
MORNING FOR SOUTHEASTERN PINAL COUNTY...

At 517 AM MST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 2.5 inches of rain have fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Oracle and San Manuel.

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 3268 11070 3261 11079 3256 11075 3264 11065

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

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, 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, 8:59 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	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.