Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 90, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 6, 2021, 3:57 PM MST for Pima County, Santa Cruz County, Arizona. It was in force for 4 hr. 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 6, 2021, 3:57 PM MST (22:57 UTC)
- Expired
- Aug 6, 2021, 8:00 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, Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 66 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 6, 5:49 PM MST | FLASH FLOOD | 22 Sw Green Valley, AZ | ARIVACA RD CLOSED DUE TO FLOODING BY ARIZONA GAME AND FISH. WASHES ARE FLOWING APPROXIMATELY 3 FEET DEEP ACROSS THE ROAD. |
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 67 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
- 1100 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1879 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- -10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
860
WGUS55 KTWC 062257
FFWTWC
AZC019-023-070200-
/O.NEW.KTWC.FF.W.0090.210806T2257Z-210807T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
357 PM MST Fri Aug 6 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
South Central Pima County in southeastern Arizona...
North Central Santa Cruz County in southeastern Arizona...
* Until 700 PM MST.
* At 357 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.7 and 1.5 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...
Arivaca, Arivaca Lake and Arivaca Road.
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 3152 11120 3152 11136 3163 11145 3174 11138
3178 11129 3177 11112 3170 11110
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ3 follow-up statements
496
WGUS75 KTWC 070035
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
535 PM MST Fri Aug 6 2021
AZC019-023-070200-
/O.CON.KTWC.FF.W.0090.000000T0000Z-210807T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Santa Cruz AZ-
535 PM MST Fri Aug 6 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING
FOR SOUTH CENTRAL PIMA AND NORTH CENTRAL SANTA CRUZ COUNTIES...
At 535 PM MST, Doppler radar indicated that thunderstorms earlier
had produced very heavy rainfall, with between 2 and 3 inches of
rain occuring in the warning area. This heavy rainfall fell along
Arivaca Road.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Arivaca and Arivaca Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3152 11120 3152 11136 3163 11145 3174 11138
3178 11129 3177 11112 3170 11110
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ180
WGUS55 KTWC 070137
FFWTWC
AZC019-023-070300-
/O.EXT.KTWC.FF.W.0090.000000T0000Z-210807T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
637 PM MST Fri Aug 6 2021
The National Weather Service in Tucson has extended the
* Flash Flood Warning for...
South Central Pima County in southeastern Arizona...
North Central Santa Cruz County in southeastern Arizona...
* Until 800 PM MST.
* At 637 PM MST, Doppler radar indicated that thunderstorms earlier
had produced very heavy rainfall, with between 2 and 3 inches of
rain occurring in the warning area. This heavy rainfall fell along
Arivaca Road and there have been reports that portions of Arivaca
Road are closed due to flash flooding.
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...
Arivaca and Arivaca Lake.
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 3152 11120 3152 11136 3163 11145 3174 11138
3178 11129 3177 11112 3170 11110
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ227
WGUS75 KTWC 070301
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
801 PM MST Fri Aug 6 2021
AZC019-023-070311-
/O.EXP.KTWC.FF.W.0090.000000T0000Z-210807T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Santa Cruz AZ-
801 PM MST Fri Aug 6 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL PIMA AND NORTH
CENTRAL SANTA CRUZ COUNTIES...
The heavy rain has ended. Flash flooding is no longer expected to
pose a threat. Please continue to heed remaining road closures.
LAT...LON 3152 11120 3152 11136 3163 11145 3174 11138
3178 11129 3177 11112 3170 11110
$$
GZThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 5:21 PM MST | Special Weather Statement | TWC | Pima | 39 min |
| Aug 6, 12:52 PM MST | Special Weather Statement | TWC | Santa Cruz | 38 min |
| Aug 6, 1:16 PM MST | Areal Flood Advisory | TWC | Cochise, Santa Cruz | 3 hr |
| Aug 6, 1:26 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 34 min |
| Aug 6, 1:58 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 47 min |
| Aug 6, 2:05 PM MST | Areal Flood Advisory | TWC | Santa Cruz | 115 min |
| Aug 6, 2:29 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 31 min |
| Aug 6, 2:36 PM MST | Special Weather Statement | TWC | Pima | 24 min |
| Aug 6, 2:43 PM MST | Areal Flood Advisory | TWC | Graham | 2 hr |
| Aug 6, 2:46 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Graham | 44 min |
| Aug 6, 2:51 PM MST | Special Weather Statement | TWC | Santa Cruz | 24 min |
| Aug 6, 2:57 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 33 min |
| Aug 6, 3:00 PM MST | Areal Flood Advisory | TWC | Santa Cruz | 2 hr |
| Aug 6, 3:10 PM MST | Flash Flood Warning | TWC | Santa Cruz | 3 hr |
| Aug 6, 3:16 PM MST | Areal Flood Advisory | TWC | Pima | 119 min |
| Aug 6, 3:26 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 6, 3:31 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 29 min |
| Aug 6, 3:40 PM MST | Areal Flood Advisory | TWC | Cochise | 3 hr |
| Aug 6, 3:46 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 29 min |
| Aug 6, 3:59 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 46 min |
| Aug 6, 4:12 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 6, 4:19 PM MST | Areal Flood Advisory | TWC | Cochise | 116 min |
| Aug 6, 4:55 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 6, 4:58 PM MST | Special Weather Statement | TWC | Pima | 32 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.