Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 99, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 10, 2021, 6:26 AM MST for Pima County, Pinal County, Arizona. It was in force for 5 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 10, 2021, 6:26 AM MST (13:26 UTC)
- Expired
- Aug 10, 2021, 11:00 AM MST
- In force
- 5 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Pima County, AZ, Pinal County, AZ
The radar
The Tucson radar (KEMX), 68 km from the middle of the area, began a volume at 13:29 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, 1.4 hours before the alert went out and 35 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
- 1176 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1330 m above ground
- 0-6 km bulk shear
- 1 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
021
WGUS55 KTWC 101326
FFWTWC
AZC019-021-101630-
/O.NEW.KTWC.FF.W.0099.210810T1326Z-210810T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
626 AM MST Tue Aug 10 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
Northeastern Pima County in southeastern Arizona...
Southern Pinal County in southeastern Arizona...
* Until 930 AM MST.
* At 626 AM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain near the Catalina Mountains as
well as Catalina and Oro Valley. Between 1 and 2 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
Excessive rainfall over the Bighorn burn scar will result in debris
flow moving through the Sutherland Wash and into the CDO. The debris
flow can consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Catalina, Oro Valley, Saddlebrooke, Mount Lemmon/Summerhaven and
Catalina State Park.
This includes the following Flash Flood Prone Locations...
E Wilds Rd at the Canada del Oro.
This includes the following highways...
Route 77 between mile markers 80 and 88.
This includes the following streams and drainages...
Bird Canyon, Big Wash, Sabino Creek, Sutherland Wash, Rillito
River, Canada del Oro, Stratton Wash, Chalk Creek, Alder Wash,
Chirreon Wash, Gibb Wash and Esperero Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry washes is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3257 11077 3246 11067 3234 11083 3242 11097
3251 11094
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
WJM1 follow-up statement
991
WGUS55 KTWC 101408
FFWTWC
AZC019-021-101800-
/O.EXT.KTWC.FF.W.0099.000000T0000Z-210810T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
708 AM MST Tue Aug 10 2021
The National Weather Service in Tucson has extended the
* Flash Flood Warning for...
Northeastern Pima County in southeastern Arizona...
Southern Pinal County in southeastern Arizona...
* Until 1100 AM MST.
* At 708 AM MST, Doppler radar and automated rain gauges indicated
thunderstorms still producing very heavy rain in and around the
Catalinas. Between 1.5 and 3 inches of rain have fallen. Flash
flooding is ongoing.
Excessive rainfall over the Bighorn burn scar will result in debris
flow moving through the Sutherland Wash and into the CDO. The debris
flow can consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Catalina, Oro Valley, Saddlebrooke, Mount Lemmon/Summerhaven and
Catalina State Park.
This includes the following Flash Flood Prone Locations...
E Wilds Rd at the Canada del Oro.
This includes the following highways...
Route 77 between mile markers 81 and 88.
This includes the following streams and drainages...
Bird Canyon, Big Wash, Sabino Creek, Sutherland Wash, Rillito
River, Canada del Oro, Stratton Wash, Chalk Creek, Alder Wash,
Chirreon Wash, Gibb Wash and Esperero Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry washes is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3257 11077 3246 11067 3234 11083 3242 11097
3251 11094
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
WJMThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 4:04 AM MST | Areal Flood Advisory | TWC | Pima, Pinal | 3 hr |
| Aug 10, 4:44 AM MST | Special Weather Statement | TWC | 46 min | |
| Aug 10, 5:12 AM MST | Flash Flood Warning | TWC | Pima, Pinal | 3 hr |
| Aug 10, 5:39 AM MST | Areal Flood Advisory | TWC | Pima, Pinal | 111 min |
| Aug 10, 6:49 AM MST | Areal Flood Advisory | TWC | Cochise, Graham | 116 min |
| Aug 10, 6:55 AM MST | Areal Flood Advisory | TWC | Cochise, Pima, Pinal | 4 hr |
| Aug 10, 8:27 AM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 3 hr |
| Aug 10, 8:32 AM MST | Flash Flood Warning | TWC | Greenlee | 3 hr |
| Aug 10, 9:11 AM MST | Areal Flood Advisory | TWC | Pima, Santa Cruz | 3 hr |
| Aug 10, 10:51 AM MST | Areal Flood Warning | TWC | Pima, Pinal | 18 hr |
| Aug 10, 11:00 AM MST | Areal Flood Advisory | TWC | Cochise, Pima, Pinal | 2 hr |
| Aug 10, 11:09 AM MST | Areal Flood Advisory | TWC | Cochise, Graham | 111 min |
| Aug 10, 11:41 AM MST | Flash Flood Warning | TWC | Cochise | 3 hr |
| Aug 10, 12:52 PM MST | Special Weather Statement | TWC | Cochise | 38 min |
| Aug 10, 12:55 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 50 min |
| Aug 10, 1:38 PM MST | Special Weather Statement | TWC | Cochise | 52 min |
| Aug 10, 1:43 PM MST | Areal Flood Advisory | TWC | Cochise | 3 hr |
| Aug 10, 1:46 PM MST | Areal Flood Advisory | TWC | Cochise | 119 min |
| Aug 10, 1:58 PM MST | Flash Flood Warning | TWC | Cochise | 3 hr |
| Aug 10, 2:00 PM MST | Special Weather Statement | TWC | 45 min | |
| Aug 10, 2:08 PM MST | Flash Flood Warning | TWC | Cochise | 2 hr |
| Aug 10, 2:39 PM MST | Flash Flood Warning | TWC | Cochise | 3 hr |
| Aug 10, 3:41 PM MST | Special Weather Statement | TWC | Santa Cruz | 34 min |
| Aug 10, 4:38 PM MST | Special Weather Statement | TWC | Santa Cruz | 52 min |
| Aug 10, 4:39 PM MST | Special Weather Statement | TWC | Pima | 36 min |
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.