Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 85, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 2, 2021, 5:58 PM MST for Pima County, Arizona. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 2, 2021, 5:58 PM MST (00:58 UTC)
- Expired
- Aug 2, 2021, 9:00 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 Tucson radar (KEMX), 35 km from the middle of the area, began a volume at 01:01 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 2, 6:27 PM MST | FLASH FLOOD | 9 Ene Tucson, AZ | FLOODING AT TANQUE VERDE RD AND N CONESTOGA AVE CAUSED A CAR TO STALL AND BECOME STUCK. |
| Aug 2, 8:35 PM MST | FLASH FLOOD | 7 Ene Tucson, AZ | SWIFT WATER RESCUE OF 3 PEOPLE NEAR TANQUE VERDE WASH AND BONANZA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 1.0 hours before the alert went out and 19 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
- 1093 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 2632 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
932
WGUS55 KTWC 030058
FFWTWC
AZC019-030400-
/O.NEW.KTWC.FF.W.0085.210803T0058Z-210803T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
558 PM MST Mon Aug 2 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
East Central Pima County in southeastern Arizona...
* Until 900 PM MST.
* At 558 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1 inch of rain has fallen. The Aqua Caliente rain gauge
reported 0.74 inches of rainfall in 15 minutes. Flash flooding is
ongoing or expected to begin shortly. This warning replaces the
Urban and Small Stream Advisory for the same area.
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...
Tucson, Tanque Verde and Saguaro National Park East.
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.
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.
&&
LAT...LON 3231 11075 3226 11065 3217 11064 3211 11061
3208 11069 3211 11070 3219 11077 3227 11080
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ1 follow-up statement
291
WGUS75 KTWC 030205
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
705 PM MST Mon Aug 2 2021
AZC019-030400-
/O.CON.KTWC.FF.W.0085.000000T0000Z-210803T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
705 PM MST Mon Aug 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM MST THIS EVENING
FOR EAST CENTRAL PIMA COUNTY...
At 705 PM MST, Doppler radar and automated rain gauges indicated
that thunderstorms had produced heavy rain, with between 1 and 2
inches of rainfall occurring in the warning area. The rain gauge at
Aqua Caliente Wash at Tanque Verde reported 1.14 inches of rainfall,
with a report of flooding at Tanque Verde Rd and North Conestoga Ave.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Tucson, Tanque Verde and Saguaro National Park East.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3231 11075 3226 11065 3217 11064 3211 11061
3208 11069 3211 11070 3219 11077 3227 11080
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
GZThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 5:15 PM MST | Special Weather Statement | TWC | Santa Cruz | 30 min |
| Aug 2, 5:19 PM MST | Dust Storm Advisory | TWC | Cochise | 41 min |
| Aug 2, 5:33 PM MST | Special Weather Statement | TWC | 42 min | |
| Aug 2, 5:48 PM MST | Special Weather Statement | TWC | 42 min | |
| Aug 2, 5:51 PM MST | Areal Flood Advisory | TWC | Pima | 114 min |
| Aug 2, 6:24 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 2, 6:26 PM MST | Areal Flood Advisory | TWC | Cochise, Santa Cruz | 2 hr |
| Aug 2, 6:31 PM MST | Special Weather Statement | TWC | 59 min | |
| Aug 2, 6:37 PM MST | Severe Thunderstorm Warning | TWC | Pima | 38 min |
| Aug 2, 6:55 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Aug 2, 7:06 PM MST | Areal Flood Advisory | TWC | Pinal | 114 min |
| Aug 2, 7:06 PM MST | Special Weather Statement | TWC | Cochise | 39 min |
| Aug 2, 7:15 PM MST | Special Weather Statement | TWC | Santa Cruz | 45 min |
| Aug 2, 7:25 PM MST | Special Weather Statement | TWC | 50 min | |
| Aug 2, 7:31 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 min |
| Aug 2, 8:13 PM MST | Severe Thunderstorm Warning | TWC | Pima | 33 min |
| Aug 2, 8:14 PM MST | Flash Flood Warning | TWC | Pima | 3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.