Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 88, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 5, 2021, 3:47 PM MST for Santa Cruz 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 5, 2021, 3:47 PM MST (22:47 UTC)
- Expired
- Aug 5, 2021, 6:45 PM MST
- In force
- 3 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 63 km from the middle of the area, began a volume at 22:48 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, 10.8 hours before the alert went out and 90 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
- 1468 J/kg
- Mixed-layer CIN
- -213 J/kg
- Mixed-layer LCL
- 1735 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
699
WGUS55 KTWC 052247
FFWTWC
AZC023-060145-
/O.NEW.KTWC.FF.W.0088.210805T2247Z-210806T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
347 PM MST Thu Aug 5 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
Southern Santa Cruz County in southeastern Arizona...
* Until 645 PM MST.
* At 347 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. 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...
Nogales and Kino Springs.
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.
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 3133 11093 3140 11090 3140 11087 3141 11076
3133 11076 3133 11080 3133 11088
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ2 follow-up statements
092
WGUS75 KTWC 052308
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
408 PM MST Thu Aug 5 2021
AZC023-060145-
/O.CON.KTWC.FF.W.0088.000000T0000Z-210806T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Santa Cruz AZ-
408 PM MST Thu Aug 5 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MST THIS
EVENING FOR SOUTHERN SANTA CRUZ COUNTY...
At 408 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 3 inches of rain have
fallen east of State Highway 82 and south of Kino Springs Drive.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Nogales and Kino Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3133 11093 3140 11090 3140 11087 3141 11076
3133 11076 3133 11080 3133 11088
FLASH FLOOD...RADAR INDICATED
$$
GZ318
WGUS75 KTWC 060145
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
645 PM MST Thu Aug 5 2021
AZC023-060155-
/O.EXP.KTWC.FF.W.0088.000000T0000Z-210806T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Santa Cruz AZ-
645 PM MST Thu Aug 5 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHERN SANTA CRUZ COUNTY...
The heavy rain has ended. Flash flooding is no longer expected to
pose a threat. Please continue to heed remaining road closures.
LAT...LON 3133 11093 3140 11090 3140 11087 3141 11076
3133 11076 3133 11080 3133 11088
$$
GZThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 3:05 PM MST | Special Weather Statement | TWC | Santa Cruz | 40 min |
| Aug 5, 3:26 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 34 min |
| Aug 5, 3:36 PM MST | Areal Flood Advisory | TWC | Santa Cruz | 114 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.