Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 148, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 17, 2021, 7:37 PM MST for Pima County, Arizona. It was in force for 113 min. 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 17, 2021, 7:37 PM MST (02:37 UTC)
- Expired
- Aug 17, 2021, 9:30 PM MST
- In force
- 113 min
- 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), 43 km from the middle of the area, began a volume at 02:40 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 17, 7:58 PM MST | FLASH FLOOD | 3 Nne Tucson, AZ | SWIFT WATER RESCUE AT 5TH AND CHANTILLY. |
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 00:00Z, 2.6 hours before the alert went out and 3 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
- -11 J/kg
- Mixed-layer LCL
- 1309 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
398
WGUS55 KTWC 180237
FFWTWC
AZC019-180430-
/O.NEW.KTWC.FF.W.0148.210818T0237Z-210818T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
737 PM MST Tue Aug 17 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
East Central Pima County in southeastern Arizona...
* Until 930 PM MST.
* At 737 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 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...
Tucson, Davis-Monthan Air Force Base, Drexel Heights, Tanque
Verde, South Tucson, Catalina Foothills, Sabino Canyon Recreation
Area, Tucson International Airport and Saguaro National Park East.
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 3217 11104 3234 11087 3224 11066 3207 11091
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
RH1 follow-up statement
499 WGUS75 KTWC 180428 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 928 PM MST Tue Aug 17 2021 AZC019-180438- /O.EXP.KTWC.FF.W.0148.000000T0000Z-210818T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pima AZ- 928 PM MST Tue Aug 17 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM MST THIS EVENING FOR EAST CENTRAL PIMA COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3217 11104 3234 11087 3224 11066 3207 11091 $$ RH
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 7:18 PM MST | Severe Thunderstorm Warning | TWC | Pima | 42 min |
| Aug 17, 7:33 PM MST | Areal Flood Advisory | TWC | Pima | 4 min |
| Aug 17, 7:44 PM MST | Areal Flood Advisory | TWC | Graham, Pima, Pinal | 3 hr |
| Aug 17, 9:37 PM MST | Flash Flood Watch | TWC | Cochise, Graham, Greenlee, Pinal | 22 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.