Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 95, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 8, 2021, 4:48 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 8, 2021, 4:48 PM MST (23:48 UTC)
- Expired
- Aug 8, 2021, 7:45 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), 59 km from the middle of the area, began a volume at 23:48 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, 11.8 hours before the alert went out and 88 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
- 359 J/kg
- Mixed-layer CIN
- -232 J/kg
- Mixed-layer LCL
- 1832 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
248
WGUS55 KTWC 082348
FFWTWC
AZC023-090245-
/O.NEW.KTWC.FF.W.0095.210808T2348Z-210809T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
448 PM MST Sun Aug 8 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
Southeastern Santa Cruz County in southeastern Arizona...
* Until 745 PM MST.
* At 448 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. Although its not raining in Nogales yet, intense
thunderstorms producing heavy rainfall will move into the city
within the hour.
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, Nogales International Airport, Patagonia Lake State Park,
Kino Springs and Lochiel.
This includes the following Flash Flood Prone Locations...
Nogales Wash at Doe St Bridge and Nogales Port of Entry Deconcini
Crossing.
This includes the following streams and drainages...
Sonoita Creek, Harshaw Creek, Santa Cruz River and Potrero Creek.
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 3133 11101 3139 11099 3146 11093 3152 11083
3154 11069 3146 11064 3142 11050 3133 11049
3133 11050 3133 11065 3133 11075 3133 11080
3133 11088 3133 11097 3133 11100
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JRM1 follow-up statement
324
WGUS75 KTWC 090243
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
743 PM MST Sun Aug 8 2021
AZC023-090253-
/O.EXP.KTWC.FF.W.0095.000000T0000Z-210809T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Santa Cruz AZ-
743 PM MST Sun Aug 8 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 745 PM MST THIS EVENING FOR
SOUTHEASTERN SANTA CRUZ COUNTY...
Flash Flooding threat has diminished, however small stream flooding
is likely. Increased flows are also being observed on the Santa Cruz
near Nogales. The Flash Flood Warning will be allowed to expire.
LAT...LON 3133 11101 3139 11099 3146 11093 3152 11083
3154 11069 3146 11064 3142 11050 3133 11049
3133 11050 3133 11065 3133 11075 3133 11080
3133 11088 3133 11097 3133 11100
$$
JRMThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 5:46 PM MST | Special Weather Statement | TWC | 44 min | |
| Aug 7, 5:54 PM MST | Special Weather Statement | TWC | Greenlee | 36 min |
| Aug 7, 6:19 PM MST | Areal Flood Advisory | TWC | Pima | 116 min |
| Aug 8, 2:48 PM MST | Severe Thunderstorm Warning | TWC | Pima | 42 min |
| Aug 8, 2:54 PM MST | Special Weather Statement | TWC | Greenlee | 36 min |
| Aug 8, 3:08 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Aug 8, 3:42 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 33 min |
| Aug 8, 3:46 PM MST | Special Weather Statement | TWC | 44 min | |
| Aug 8, 4:11 PM MST | Special Weather Statement | TWC | Pima | 49 min |
| Aug 8, 4:12 PM MST | Special Weather Statement | TWC | Santa Cruz | 33 min |
| Aug 8, 4:19 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 86 min |
| Aug 8, 4:21 PM MST | Flash Flood Warning | TWC | Cochise | 114 min |
| Aug 8, 4:21 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 84 min |
| Aug 8, 4:26 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 8, 4:33 PM MST | Special Weather Statement | TWC | Cochise | 27 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.