Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 152, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 28, 2021, 3:57 PM MST for Santa Cruz County, Arizona. It was in force for 108 min. 1 report 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 28, 2021, 3:57 PM MST (22:57 UTC)
- Expired
- Aug 28, 2021, 5:45 PM MST
- In force
- 108 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 68 km from the middle of the area, began a volume at 23:00 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 28, 4:00 PM MST | FLASH FLOOD | 1 S Nogales, AZ | WEBCAM IMAGERY OF NOGALES WASH DEPICTING WASH OVERTOPPING ITS BANKS. |
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 12:00Z, 11.0 hours before the alert went out and 91 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
- 21 J/kg
- Mixed-layer CIN
- -393 J/kg
- Mixed-layer LCL
- 2964 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -35 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
928
WGUS55 KTWC 282257
FFWTWC
AZC023-290045-
/O.NEW.KTWC.FF.W.0152.210828T2257Z-210829T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
357 PM MST Sat Aug 28 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
Southwestern Santa Cruz County in southeastern Arizona...
* Until 545 PM MST.
* At 357 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across and south of Nogales. Between 1 and 1.75 inches
of rain have fallen south of the International Border near Nogales
in 15 to 30 minutes. This rainfall runoff will flow north into the
washes that feed into the Nogales Wash that flow through the city
of Nogales. Flash flooding is 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...
Nogales.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3133 11101 3140 11098 3140 11094 3133 11090
FLASH FLOOD...RADAR INDICATED
$$
CWR2 follow-up statements
021
WGUS75 KTWC 282358
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
458 PM MST Sat Aug 28 2021
AZC023-290045-
/O.CON.KTWC.FF.W.0152.000000T0000Z-210829T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Santa Cruz AZ-
458 PM MST Sat Aug 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST THIS
AFTERNOON FOR SOUTHWESTERN SANTA CRUZ COUNTY...
At 458 PM MST, Doppler radar indicated very heavy rain south of
Nogales, across the International Border. This rainfall caused rapid
runoff in washes that feed the Nogales Wash as it flows into the
city of Nogales. A significant rise of the Nogales Wash was observed
reaching its banks on an online camera. Although the water has held
steady in the wash or slightly receded, flash flooding of the area
is still likely through 545 PM MST.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Nogales.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3133 11101 3140 11098 3140 11094 3133 11090
FLASH FLOOD...RADAR INDICATED
$$
CWR023 WGUS75 KTWC 290043 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 543 PM MST Sat Aug 28 2021 AZC023-290053- /O.EXP.KTWC.FF.W.0152.000000T0000Z-210829T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Cruz AZ- 543 PM MST Sat Aug 28 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST THIS AFTERNOON FOR SOUTHWESTERN SANTA CRUZ COUNTY... Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3133 11101 3140 11098 3140 11094 3133 11090 $$ CWR
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 5:01 PM MST | Special Weather Statement | TWC | 44 min | |
| Aug 27, 5:04 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 27, 5:27 PM MST | Special Weather Statement | TWC | 33 min | |
| Aug 28, 3:54 AM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Aug 28, 2:34 PM MST | Special Weather Statement | TWC | Santa Cruz | 41 min |
| Aug 28, 2:42 PM MST | Special Weather Statement | TWC | Santa Cruz | 48 min |
| Aug 28, 3:13 PM MST | Severe Thunderstorm Warning | TWC | Pima | 47 min |
| Aug 28, 3:32 PM MST | Areal Flood Advisory | TWC | Pima | 118 min |
| Aug 28, 3:49 PM MST | Special Weather Statement | TWC | Santa Cruz | 41 min |
| Aug 28, 3:53 PM MST | Dust Storm Warning | TWC | Pima | 52 min |
| Aug 28, 3:58 PM MST | Severe Thunderstorm Warning | TWC | Pima | 62 min |
| Aug 28, 4:03 PM MST | Flash Flood Warning | TWC | Pima | 117 min |
| Aug 28, 4:06 PM MST | Special Weather Statement | TWC | 39 min | |
| Aug 28, 4:14 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 28, 4:24 PM MST | Severe Thunderstorm Warning | TWC | Pima | 51 min |
| Aug 28, 4:26 PM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Aug 28, 4:26 PM MST | Severe Thunderstorm Warning | TWC | Pima | 34 min |
| Aug 28, 4:31 PM MST | Flash Flood Warning | TWC | Pima | 119 min |
| Aug 28, 4:34 PM MST | Areal Flood Advisory | TWC | Graham, Pinal | 116 min |
| Aug 28, 4:37 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 38 min |
| Aug 28, 4:47 PM MST | Dust Storm Warning | TWC | Pima, Pinal | 118 min |
| Aug 28, 4:58 PM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 62 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.