Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 92, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 6, 2021, 6:23 PM MST for Pima County, Pinal County, Arizona. It was in force for 4 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 6, 2021, 6:23 PM MST (01:23 UTC)
- Expired
- Aug 6, 2021, 10:20 PM MST
- In force
- 4 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Pima County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 105 km from the middle of the area, began a volume at 01:22 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, 1.4 hours before the alert went out and 113 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
- 1326 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 2589 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
129
WGUS55 KTWC 070123
FFWTWC
AZC019-021-070430-
/O.NEW.KTWC.FF.W.0092.210807T0123Z-210807T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
623 PM MST Fri Aug 6 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
North Central Pima County in southeastern Arizona...
Southwestern Pinal County in southeastern Arizona...
* Until 930 PM MST.
* At 623 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...
Santa Rosa, Covered Wells, Anegam, North Komelik, Palo Verde
Stand, Ventana, Ak Chin, San Luis and Santa Rosa School.
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.
Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3256 11200 3255 11183 3212 11201 3217 11236
3249 11224
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ3 follow-up statements
001
WGUS75 KTWC 070239
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
739 PM MST Fri Aug 6 2021
AZC019-021-070430-
/O.CON.KTWC.FF.W.0092.000000T0000Z-210807T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Pinal AZ-
739 PM MST Fri Aug 6 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MST THIS
EVENING FOR NORTH CENTRAL PIMA AND SOUTHWESTERN PINAL COUNTIES...
At 739 PM MST, Doppler radar indicated that thunderstorms had
produced very heavy rainfall, with a large area of Doppler
precipitation estimates between 3 and 4 inches occurring within the
warning area.
HAZARD...Flash flooding caused by thunderstorms and heavy rain.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Santa Rosa, Covered Wells, Anegam, North Komelik, Palo Verde
Stand, Ventana, Ak Chin, San Luis and Santa Rosa School.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3256 11200 3255 11183 3212 11201 3217 11236
3249 11224
FLASH FLOOD...RADAR INDICATED
$$
GZ234
WGUS55 KTWC 070405
FFWTWC
AZC019-021-070530-
/O.EXT.KTWC.FF.W.0092.000000T0000Z-210807T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
905 PM MST Fri Aug 6 2021
The National Weather Service in Tucson has extended the
* Flash Flood Warning for...
North Central Pima County in southeastern Arizona...
Southwestern Pinal County in southeastern Arizona...
* Until 1030 PM MST.
* At 905 PM MST, Doppler radar indicated that thunderstorms had
produced very heavy rainfall earlier, with a large area of Doppler
precipitation estimates between 3 and 4 inches occurring within
the warning area. Therefore, the Flash Flood Warning has been
extended another hour.
HAZARD...Flash flooding caused by thunderstorms and heavy
rainfall.
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...
Santa Rosa, Covered Wells, Anegam, North Komelik, Palo Verde
Stand, Ventana, Ak Chin, San Luis and Santa Rosa School.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3256 11200 3255 11183 3212 11201 3217 11236
3249 11224
FLASH FLOOD...RADAR INDICATED
$$
GZ280
WGUS75 KTWC 070520
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
1020 PM MST Fri Aug 6 2021
AZC019-021-070530-
/O.CAN.KTWC.FF.W.0092.000000T0000Z-210807T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Pinal AZ-
1020 PM MST Fri Aug 6 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL PIMA AND
SOUTHWESTERN PINAL COUNTIES...
The heavy rain has ended and the flow from the initial runoff is
diminishing across northern portions of the Tohono O'Odham Nation.
Elevated flow will continue in some area washes, so please continue
to heed remaining road closures.
LAT...LON 3256 11200 3255 11183 3212 11201 3217 11236
3249 11224
$$
WJMThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 5:01 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 min |
| Aug 6, 5:02 PM MST | Special Weather Statement | TWC | Pima | 43 min |
| Aug 6, 5:14 PM MST | Special Weather Statement | TWC | Greenlee | 46 min |
| Aug 6, 5:18 PM MST | Severe Thunderstorm Warning | TWC | Pima | 42 min |
| Aug 6, 5:27 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 6, 5:28 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 6, 5:29 PM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 46 min |
| Aug 6, 5:40 PM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Aug 6, 5:50 PM MST | Special Weather Statement | TWC | Graham | 25 min |
| Aug 6, 6:00 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Aug 6, 6:02 PM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 58 min |
| Aug 6, 6:19 PM MST | Tornado Warning | TWC | Pima | 26 min |
| Aug 6, 7:02 PM MST | Special Weather Statement | TWC | 43 min | |
| Aug 6, 9:25 PM MST | Areal Flood Warning | TWC | Pima | 3 hr |
| Aug 7, 12:54 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 51 min |
| Aug 7, 1:41 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 49 min |
| Aug 7, 2:47 PM MST | Special Weather Statement | TWC | Cochise | 28 min |
| Aug 7, 2:55 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 34 min |
| Aug 7, 3:09 PM MST | Areal Flood Advisory | TWC | Cochise | 111 min |
| Aug 7, 3:17 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 43 min |
| Aug 7, 3:25 PM MST | Special Weather Statement | TWC | Greenlee | 50 min |
| Aug 7, 3:53 PM MST | Special Weather Statement | TWC | 52 min | |
| Aug 7, 4:51 PM MST | Special Weather Statement | TWC | Pima | 39 min |
| Aug 7, 4:57 PM MST | Special Weather Statement | TWC | Cochise | 48 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.