Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 118, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 12, 2021, 12:06 AM MST for Pima County, Arizona. It was in force for 103 min. 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 12, 2021, 12:06 AM MST (07:06 UTC)
- Expired
- Aug 12, 2021, 1:49 AM MST
- In force
- 103 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Pima County, AZ
The radar
The Tucson radar (KEMX), 87 km from the middle of the area, began a volume at 07:09 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 00:00Z, 7.1 hours before the alert went out and 48 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
- 885 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 1645 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
627
WGUS55 KTWC 120706
FFWTWC
AZC019-120900-
/O.NEW.KTWC.FF.W.0118.210812T0706Z-210812T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1206 AM MST Thu Aug 12 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
North Central Pima County in southeastern Arizona...
* Until 200 AM MST.
* At 1206 AM MST, Doppler radar and automated rain gages indicated
thunderstorms producing between 1 and 2 inches of heavy rain. An
automated rain at Trico Road to the north of manville reported
1.97 inches of rain in the past hour. Flash flooding is ongoing or
expected to begin shortly, especially in those dry washes that
drain into Brawley Wash.
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...
Marana, Avra Valley, Saguaro National Park West and Picture Rocks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3238 11144 3250 11148 3250 11124 3225 11112
3226 11138
FLASH FLOOD...RADAR INDICATED
$$
CWR1 follow-up statement
631
WGUS75 KTWC 120849
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
149 AM MST Thu Aug 12 2021
AZC019-120859-
/O.CAN.KTWC.FF.W.0118.000000T0000Z-210812T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
149 AM MST Thu Aug 12 2021
...FLASH FLOOD WARNING FOR NORTH CENTRAL PIMA COUNTY HAS BEEN
REPLACED WITH A FLOOD ADVISORY...
LAT...LON 3238 11144 3250 11148 3250 11124 3225 11112
3226 11138
$$
CRThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 11:52 PM MST | Special Weather Statement | TWC | 38 min | |
| Aug 12, 12:37 AM MST | Areal Flood Advisory | TWC | Pima | 113 min |
| Aug 12, 1:49 AM MST | Areal Flood Advisory | TWC | Pima | 116 min |
| Aug 12, 11:48 AM MST | Flash Flood Watch | TWC | Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz | 5 days |
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.