Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 83, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 30, 2021, 11:37 PM MST for Pima County, Arizona. It was in force for 2 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, 11:37 PM MST (06:37 UTC)
- Expired
- Jul 31, 2021, 2:00 AM MST
- In force
- 2 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Pima County, AZ
The radar
The Phoenix radar (KIWA), 122 km from the middle of the area, began a volume at 06:39 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, 6.6 hours before the alert went out and 128 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.
675
WGUS55 KTWC 310637
FFWTWC
AZC019-310900-
/O.NEW.KTWC.FF.W.0083.210731T0637Z-210731T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1137 PM MST Fri Jul 30 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 1137 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen over Indian roads 15 and 34 and also state highway 86.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, highways
and streets as well as other poor drainage and low-
lying areas.
* Some locations that will experience flash flooding include...
Covered Wells, Ventana, Vaya Chin and Mountain Village.
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.
&&
LAT...LON 3249 11238 3250 11219 3202 11200 3202 11229
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
348
WGUS75 KTWC 310722
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
1222 AM MST Sat Jul 31 2021
AZC019-310900-
/O.CON.KTWC.FF.W.0083.000000T0000Z-210731T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1222 AM MST Sat Jul 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM MST EARLY THIS
MORNING FOR NORTH CENTRAL PIMA COUNTY...
At 1222 AM MST, Doppler radar continued to indicate thunderstorms
producing heavy rain across the warned area, mainly north of state
highway 86 or across Indian routes 15 and 34. Between 1 and 3 inches
of rain with localized spots of 3 to 4 inches have fallen. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways and streets as well as other poor drainage and
low-lying areas.
Some locations that will experience flash flooding include...
Covered Wells, Ventana, Vaya Chin and Mountain Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3249 11238 3250 11219 3202 11200 3202 11229
FLASH FLOOD...RADAR INDICATED
$$434 WGUS75 KTWC 310859 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 159 AM MST Sat Jul 31 2021 AZC019-310909- /O.EXP.KTWC.FF.W.0083.000000T0000Z-210731T0900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pima AZ- 159 AM MST Sat Jul 31 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 2 AM MST EARLY THIS MORNING FOR NORTH CENTRAL PIMA COUNTY... Flood waters have receded. The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. A Flash Flood Watch remains in effect until 500 AM MST for a portion of Southeast Arizona. LAT...LON 3249 11238 3250 11219 3202 11200 3202 11229 $$
The 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, 7:59 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| 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 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.