Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 86, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 2, 2021, 6:55 PM MST for Pima 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 2, 2021, 6:55 PM MST (01:55 UTC)
- Expired
- Aug 2, 2021, 10:00 PM MST
- In force
- 3 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Pima County, AZ
The radar
The Tucson radar (KEMX), 4 km from the middle of the area, began a volume at 01:55 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, 1.9 hours before the alert went out and 42 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
- 1093 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 2632 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
242
WGUS55 KTWC 030155
FFWTWC
AZC019-030400-
/O.NEW.KTWC.FF.W.0086.210803T0155Z-210803T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
655 PM MST Mon Aug 2 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
East Central Pima County in southeastern Arizona...
* Until 900 PM MST.
* At 655 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 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...
mainly rural areas of East Central Pima County along State Highway
83.
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.
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 3195 11070 3195 11054 3173 11055 3174 11073
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ3 follow-up statements
191
WGUS75 KTWC 030228
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
728 PM MST Mon Aug 2 2021
AZC019-030400-
/O.CON.KTWC.FF.W.0086.000000T0000Z-210803T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
728 PM MST Mon Aug 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM MST THIS EVENING
FOR EAST CENTRAL PIMA COUNTY...
At 728 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2 inches of rain have
fallen. The rain gauge at Empire Peak reported 1.89 inches of
rainfall in 30 minutes.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of East Central Pima County along State Highway
83.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3195 11070 3195 11054 3173 11055 3174 11073
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ263
WGUS55 KTWC 030342
FFWTWC
AZC019-030500-
/O.EXT.KTWC.FF.W.0086.000000T0000Z-210803T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
842 PM MST Mon Aug 2 2021
The National Weather Service in Tucson has extended the
* Flash Flood Warning for...
East Central Pima County in southeastern Arizona...
* Until 1000 PM MST.
* At 842 PM MST, Doppler radar and automated rain gauges indicated
that thunderstorms earlier this evening had produced very heavy
rainfall, with between 1 and 2 inches of rain occurring in the
warning area. Given this amount of rainfall, the Flash Flood
Warning will be extended another hour.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
mainly rural areas of East Central Pima County along State Highway
83.
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.
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 3195 11070 3195 11054 3173 11055 3174 11073
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
GZ258 WGUS75 KTWC 030458 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 958 PM MST Mon Aug 2 2021 AZC019-030508- /O.EXP.KTWC.FF.W.0086.000000T0000Z-210803T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pima AZ- 958 PM MST Mon Aug 2 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM MST THIS EVENING FOR EAST CENTRAL PIMA COUNTY... The heavy rain has ended. Flash flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3195 11070 3195 11054 3173 11055 3174 11073 $$ GZ
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 5:15 PM MST | Special Weather Statement | TWC | Santa Cruz | 30 min |
| Aug 2, 5:19 PM MST | Dust Storm Advisory | TWC | Cochise | 41 min |
| Aug 2, 5:33 PM MST | Special Weather Statement | TWC | 42 min | |
| Aug 2, 5:48 PM MST | Special Weather Statement | TWC | 42 min | |
| Aug 2, 5:51 PM MST | Areal Flood Advisory | TWC | Pima | 114 min |
| Aug 2, 5:58 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Aug 2, 6:24 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 2, 6:26 PM MST | Areal Flood Advisory | TWC | Cochise, Santa Cruz | 2 hr |
| Aug 2, 6:31 PM MST | Special Weather Statement | TWC | 59 min | |
| Aug 2, 6:37 PM MST | Severe Thunderstorm Warning | TWC | Pima | 38 min |
| Aug 2, 7:06 PM MST | Areal Flood Advisory | TWC | Pinal | 114 min |
| Aug 2, 7:06 PM MST | Special Weather Statement | TWC | Cochise | 39 min |
| Aug 2, 7:15 PM MST | Special Weather Statement | TWC | Santa Cruz | 45 min |
| Aug 2, 7:25 PM MST | Special Weather Statement | TWC | 50 min | |
| Aug 2, 7:31 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 min |
| Aug 2, 8:13 PM MST | Severe Thunderstorm Warning | TWC | Pima | 33 min |
| Aug 2, 8:14 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
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.