Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 159, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 30, 2021, 5:46 PM 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
- Aug 30, 2021, 5:46 PM MST (00:46 UTC)
- Expired
- Aug 30, 2021, 8:45 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 Tucson radar (KEMX), 75 km from the middle of the area, began a volume at 00:46 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, 0.8 hours before the alert went out and 42 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.
- Mixed-layer CAPE
- 480 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 2322 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -55 m²/s²
- 0-3 km storm-relative helicity
- -71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
714
WGUS55 KTWC 310046
FFWTWC
AZC019-310345-
/O.NEW.KTWC.FF.W.0159.210831T0046Z-210831T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
546 PM MST Mon Aug 30 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
North Central Pima County in southeastern Arizona...
* Until 845 PM MST.
* At 546 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. 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...
Three Points, Saguaro National Park West and Picture Rocks.
This includes the following Flash Flood Prone Locations...
Manville Rd at Brawley Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3209 11131 3207 11132 3205 11142 3214 11145
3227 11149 3229 11145 3229 11140 3230 11134
3230 11121 3226 11121 3223 11126 3215 11128
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JRM1 follow-up statement
636
WGUS75 KTWC 310133
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
633 PM MST Mon Aug 30 2021
AZC019-310345-
/O.CON.KTWC.FF.W.0159.000000T0000Z-210831T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
633 PM MST Mon Aug 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST THIS
EVENING FOR NORTH CENTRAL PIMA COUNTY...
At 633 PM MST, Doppler radar indicated thunderstorms producing heavy
rain has ended across the warned area. Between 1 and 2.5 inches of
rain have fallen. Flash flooding is likely ongoing.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Three Points, Saguaro National Park West and Picture Rocks.
This includes the following Flash Flood Prone Locations...
Manville Rd at Brawley Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3209 11131 3207 11132 3205 11142 3214 11145
3227 11149 3229 11145 3229 11140 3230 11134
3230 11121 3226 11121 3223 11126 3215 11128
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JRMThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 5:18 PM MST | Special Weather Statement | TWC | 42 min | |
| Aug 30, 5:59 PM MST | Special Weather Statement | TWC | Pinal | 46 min |
| Aug 30, 6:10 PM MST | Special Weather Statement | TWC | Pima | 35 min |
| Aug 30, 6:19 PM MST | Flash Flood Warning | TWC | Pima, Pinal | 3 hr |
| Aug 31, 1:59 AM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Aug 31, 2:47 PM MST | Areal Flood Advisory | TWC | Pima, Pinal | 7 hr |
| Aug 31, 3:14 PM MST | Areal Flood Advisory | TWC | Pima, Pinal | 5 hr |
| Aug 31, 4:00 PM MST | Special Weather Statement | TWC | Greenlee | 45 min |
| Aug 31, 4:23 PM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 3 hr |
| Aug 31, 4:36 PM MST | Flash Flood Warning | TWC | Cochise | 3 hr |
| Aug 31, 4:41 PM MST | Areal Flood Advisory | TWC | Cochise | 2 hr |
Nearby
Flash Flood Warnings in Arizona, 2021Every 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.