Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 71, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 27, 2021, 3:29 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 27, 2021, 3:29 PM MST (22:29 UTC)
- Expired
- Jul 27, 2021, 6:30 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), 58 km from the middle of the area, began a volume at 22:29 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 12:00Z, 10.5 hours before the alert went out and 29 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
- 487 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1850 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
867
WGUS55 KTWC 272229
FFWTWC
AZC019-280130-
/O.NEW.KTWC.FF.W.0071.210727T2229Z-210728T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
329 PM MST Tue Jul 27 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
Northeastern Pima County in southeastern Arizona...
* Until 630 PM MST.
* At 329 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...
Mount Lemmon/Summerhaven and Upper Sabino Creek.
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 3245 11078 3240 11070 3234 11076 3238 11080
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
RH1 follow-up statement
976 WGUS75 KTWC 280126 FFSTWC Flash Flood Statement National Weather Service Tucson AZ 626 PM MST Tue Jul 27 2021 AZC019-280136- /O.EXP.KTWC.FF.W.0071.000000T0000Z-210728T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pima AZ- 626 PM MST Tue Jul 27 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MST THIS EVENING FOR NORTHEASTERN PIMA COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3245 11078 3240 11070 3234 11076 3238 11080 $$
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 1:52 PM MST | Flash Flood Warning | TWC | Santa Cruz | 2 hr |
| Jul 27, 1:56 PM MST | Special Weather Statement | TWC | Santa Cruz | 49 min |
| Jul 27, 2:15 PM MST | Special Weather Statement | TWC | Santa Cruz | 45 min |
| Jul 27, 2:33 PM MST | Areal Flood Advisory | TWC | Cochise, Pima, Santa Cruz | 3 hr |
| Jul 27, 3:35 PM MST | Special Weather Statement | TWC | Santa Cruz | 40 min |
| Jul 27, 3:49 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Jul 27, 4:00 PM MST | Special Weather Statement | TWC | 45 min | |
| Jul 27, 4:05 PM MST | Areal Flood Advisory | TWC | Pima | 115 min |
| Jul 27, 4:25 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Jul 27, 4:34 PM MST | Blowing Dust Advisory | TWC | Pima, Pinal | 87 min |
| Jul 27, 4:42 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Jul 27, 4:56 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.