Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 79, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 30, 2021, 7:59 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
- Jul 30, 2021, 7:59 PM MST (02:59 UTC)
- Expired
- Jul 30, 2021, 11:00 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), 19 km from the middle of the area, began a volume at 03:00 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.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 3.0 hours before the alert went out and 23 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
- 211 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 2641 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
917
WGUS55 KTWC 310259
FFWTWC
AZC019-310500-
/O.NEW.KTWC.FF.W.0079.210731T0259Z-210731T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
759 PM MST Fri Jul 30 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
East Central Pima County in southeastern Arizona...
* Until 1000 PM MST.
* At 759 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 1.5 inches of rain have fallen. The automated rain gauge at
Corona de Tucson has reported 1.02 inches of rainfall in 15
minutes. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Corona De Tucson.
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 3203 11087 3202 11079 3199 11073 3190 11075
3191 11084
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GZ3 follow-up statements
080
WGUS75 KTWC 310409
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
909 PM MST Fri Jul 30 2021
AZC019-310500-
/O.CON.KTWC.FF.W.0079.000000T0000Z-210731T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
909 PM MST Fri Jul 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM MST THIS
EVENING FOR EAST CENTRAL PIMA COUNTY...
At 909 PM MST, Doppler radar and automated rain gauges indicated
that thunderstorms had produced between 1 and 1.5 inches across the
warned area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Corona De Tucson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3203 11087 3202 11079 3199 11073 3190 11075
3191 11084
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
GZ852
WGUS55 KTWC 310452
FFWTWC
AZC019-310600-
/O.EXT.KTWC.FF.W.0079.000000T0000Z-210731T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
952 PM MST Fri Jul 30 2021
The National Weather Service in Tucson has extended the
* Flash Flood Warning for...
East Central Pima County in southeastern Arizona...
* Until 1100 PM MST.
* At 952 PM MST, Doppler radar and automated rain gauges indicated
that thunderstorms had produced between 1 and 1.5 inches of
rainfall in the warned area. Light to moderate rainfall continues
to fall within the warning area.
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...
Corona De Tucson.
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 3203 11087 3202 11079 3199 11073 3190 11075
3191 11084
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
GZ052
WGUS75 KTWC 310556
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
1056 PM MST Fri Jul 30 2021
AZC019-310606-
/O.EXP.KTWC.FF.W.0079.000000T0000Z-210731T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1056 PM MST Fri Jul 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 11 PM MST THIS EVENING FOR
EAST CENTRAL PIMA COUNTY...
The heavy rain has ended. Flash flooding is no longer expected to
pose a threat. Please continue to heed remaining road closures.
LAT...LON 3203 11087 3202 11079 3199 11073 3190 11075
3191 11084
$$
GZThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:20 PM MST | Severe Thunderstorm Warning | TWC | Pima | 55 min |
| Jul 30, 5:22 PM MST | Severe Thunderstorm Warning | TWC | Pima | 29 min |
| Jul 30, 6:11 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Jul 30, 6:33 PM MST | Special Weather Statement | TWC | 42 min | |
| Jul 30, 6:52 PM MST | Special Weather Statement | TWC | 38 min | |
| Jul 30, 7:10 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Jul 30, 7:20 PM MST | Areal Flood Advisory | TWC | Pima | 4 hr |
| Jul 30, 7:40 PM MST | Special Weather Statement | TWC | 65 min | |
| Jul 30, 7:49 PM MST | Severe Thunderstorm Warning | TWC | Pima | 41 min |
| Jul 30, 7:51 PM MST | Areal Flood Advisory | TWC | Pima | 114 min |
| Jul 30, 7:57 PM MST | Severe Thunderstorm Warning | TWC | Pima | 48 min |
| Jul 30, 8:20 PM MST | Severe Thunderstorm Warning | TWC | Pima | 40 min |
| Jul 30, 8:29 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Jul 30, 8:35 PM MST | Areal Flood Advisory | TWC | Pima | 115 min |
| Jul 30, 8:47 PM MST | Flash Flood Warning | TWC | Pima | 118 min |
| Jul 30, 9:55 PM MST | Special Weather Statement | TWC | Pinal | 65 min |
| Jul 30, 10:11 PM MST | Flash Flood Warning | TWC | Pima | 4 hr |
| Jul 30, 11:37 PM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Jul 31, 2:06 AM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Jul 31, 3:51 PM MST | Areal Flood Advisory | TWC | Pinal | 114 min |
| Jul 31, 4:13 PM MST | Special Weather Statement | TWC | 47 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.