Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Jul 12, 2021, 10:16 PM MST for Pima County, Pinal County, Arizona. It was in force for 3 hr. 6 reports 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
- Jul 12, 2021, 10:16 PM MST (05:16 UTC)
- Expired
- Jul 13, 2021, 1:15 AM MST
- In force
- 3 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Pima County, AZ, Pinal County, AZ
The radar
The Tucson radar (KEMX), 72 km from the middle of the area, began a volume at 05:17 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 |
|---|---|---|---|
| Jul 12, 10:30 PM MST | FLASH FLOOD | 9 Sw Oro Valley, AZ | PUBLIC REPORT RECEIVED VIA SOCIAL MEDIA OF ROAD CLOSURE ON ORANGE GROVE ROAD AT INTERSTATE 10 UNDERPASS DUE TO FLOODING. VEHICLE STRANDED IN FLOOD WATERS. DELAYED REPORT. TIME ESTIMATED BY RADAR. |
| Jul 12, 10:35 PM MST | FLASH FLOOD | 9 Ssw Oro Valley, AZ | PUBLIC REPORT RECEIVED VIA SOCIAL MEDIA OF CAMINO DE LA TIERRA SOUTH OF ORANGE GROVE CLOSED DUE TO FLOODING UNDER RIVER RD. DELAYED REPORT. TIME ESTIMATED BY RADAR. |
| Jul 12, 10:40 PM MST | FLASH FLOOD | 4 W Tucson, AZ | PUBLIC REPORT RECEIVED VIA SOCIAL MEDIA OF A SWIFT WATER RESCUE AT THE INTERSECTION OF SILVERLAKE ROAD AND EUCLID AVE. DELAYED REPORT. TIME ESTIMATED BY RADAR. |
| Jul 12, 10:40 PM MST | FLASH FLOOD | 5 Wnw Tucson, AZ | TUCSON DEPARTMENT OF TRANSPORTATION REPORTED ROAD CLOSURE AT THE 6TH AVENUE UNDERPASS JUST NORTH OF TOOLE AVE. DELAYED REPORT. TIME ESTIMATED BY RADAR. |
| Jul 12, 10:42 PM MST | FLASH FLOOD | 5 Wnw Tucson, AZ | PUBLIC REPORT OF VEHICLE STRANDED IN FLOOD WATERS AT MABEL ST AND 7TH AVE. DELAYED REPORT. TIME ESTIMATED BY RADAR. |
| Jul 12, 10:45 PM MST | FLASH FLOOD | 5 Nw Tucson, AZ | BROADCAST MEDIA REPORT RECEIVED OF A SWIFT WATER RESCUE AT THE INTERSECTION OF GRANT RD AND TUCSON BLVD. DELAYED REPORT. TIME ESTIMATED BY RADAR. |
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, 5.3 hours before the alert went out and 32 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
- 1102 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 2775 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
749
WGUS55 KTWC 130516
FFWTWC
AZC019-021-130815-
/O.NEW.KTWC.FF.W.0018.210713T0516Z-210713T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1016 PM MST Mon Jul 12 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
Northeastern Pima County in southeastern Arizona...
South Central Pinal County in southeastern Arizona...
* Until 115 AM MST.
* At 1016 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...
Tucson, Oro Valley, Marana, Davis-Monthan Air Force Base, Casas
Adobes, Drexel Heights, Flowing Wells, Tanque Verde, South Tucson,
Avra Valley, Tortolita, Saguaro National Park West, Catalina
Foothills, Tucson International Airport, Picture Rocks and Dove
Mountain.
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.
&&
LAT...LON 3261 11120 3240 11099 3226 11075 3211 11093
3247 11146
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
RH2 follow-up statements
896
WGUS75 KTWC 130650
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
1150 PM MST Mon Jul 12 2021
AZC019-021-130815-
/O.CON.KTWC.FF.W.0018.000000T0000Z-210713T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Pinal AZ-
1150 PM MST Mon Jul 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 AM MST TUESDAY
FOR NORTHEASTERN PIMA AND SOUTH CENTRAL PINAL COUNTIES...
At 1150 PM MST, Doppler radar indicated that the thunderstorms that
produced the heavy rainfall had moved southwest out of the warning
area. Between 1 and 2 inches of rain had occurred in the warning
area. Additional rainfall amounts of 0.1 to 0.2 inches are possible.
Flash flooding is ongoing with flooded washes and some roads are
impassible.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Tucson, Oro Valley, Marana, Davis-Monthan Air Force Base, Casas
Adobes, Drexel Heights, Flowing Wells, Tanque Verde, South Tucson,
Avra Valley, Tortolita, Saguaro National Park West, Catalina
Foothills, Tucson International Airport, Picture Rocks and Dove
Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3261 11120 3240 11099 3226 11075 3211 11093
3247 11146
FLASH FLOOD...RADAR INDICATED
$$
GZ469
WGUS75 KTWC 130813
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
113 AM MST Tue Jul 13 2021
AZC019-021-130823-
/O.EXP.KTWC.FF.W.0018.000000T0000Z-210713T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Pinal AZ-
113 AM MST Tue Jul 13 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 115 AM MST EARLY THIS MORNING
FOR NORTHEASTERN PIMA AND SOUTH CENTRAL PINAL COUNTIES...
The heavy rain has ended. Flash flooding is no longer expected to
pose a threat. Please continue to heed remaining road closures.
LAT...LON 3261 11120 3240 11099 3226 11075 3211 11093
3247 11146
$$
GZThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 6:29 PM MST | Special Weather Statement | TWC | Graham | 31 min |
| Jul 12, 6:39 PM MST | Special Weather Statement | TWC | Graham | 36 min |
| Jul 12, 7:09 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima | 36 min |
| Jul 12, 7:28 PM MST | Severe Thunderstorm Warning | TWC | Graham, Pinal | 47 min |
| Jul 12, 7:45 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima, Santa Cruz | 45 min |
| Jul 12, 7:49 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima | 41 min |
| Jul 12, 7:50 PM MST | Special Weather Statement | TWC | 40 min | |
| Jul 12, 8:05 PM MST | Areal Flood Advisory | TWC | Graham | 3 hr |
| Jul 12, 8:22 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 38 min |
| Jul 12, 8:37 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 38 min |
| Jul 12, 8:37 PM MST | Tornado Warning | TWC | Santa Cruz | 23 min |
| Jul 12, 8:51 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 39 min |
| Jul 12, 9:11 PM MST | Special Weather Statement | TWC | 34 min | |
| Jul 12, 9:14 PM MST | Special Weather Statement | TWC | Pinal | 31 min |
| Jul 12, 9:22 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima | 38 min |
| Jul 12, 9:30 PM MST | Dust Storm Warning | TWC | Pima, Pinal | 60 min |
| Jul 12, 9:32 PM MST | Special Weather Statement | TWC | Santa Cruz | 43 min |
| Jul 12, 9:54 PM MST | Areal Flood Advisory | TWC | Cochise, Pima | 3 hr |
| Jul 12, 9:58 PM MST | Special Weather Statement | TWC | 47 min | |
| Jul 12, 10:24 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Jul 12, 10:33 PM MST | Flash Flood Warning | TWC | Pima | 3 hr |
| Jul 12, 10:34 PM MST | Special Weather Statement | TWC | Santa Cruz | 56 min |
| Jul 12, 11:17 PM MST | Special Weather Statement | TWC | Pima | 28 min |
| Jul 13, 2:02 PM MST | Special Weather Statement | TWC | Cochise | 43 min |
| Jul 13, 2:57 PM MST | Special Weather Statement | TWC | Santa Cruz | 33 min |
| Jul 13, 3:02 PM MST | Severe Thunderstorm Warning | TWC | Cochise, Pima, Santa Cruz | 43 min |
| Jul 13, 3:21 PM MST | Areal Flood Advisory | TWC | Pima, Santa Cruz | 2 hr |
| Jul 13, 3:45 PM MST | Special Weather Statement | TWC | Santa Cruz | 45 min |
| Jul 13, 4:15 PM MST | Special Weather Statement | TWC | Santa Cruz | 45 min |
| Jul 13, 4:20 PM MST | Special Weather Statement | TWC | 25 min | |
| Jul 13, 4:38 PM MST | Areal Flood Advisory | TWC | Pima, Pinal | 3 hr |
| Jul 13, 4:44 PM MST | Special Weather Statement | TWC | Cochise | 46 min |
| Jul 13, 4:45 PM MST | Special Weather Statement | TWC | 30 min | |
| Jul 13, 4:58 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.