Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 96, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Aug 8, 2021, 6:46 PM MST for Cochise County, Arizona. It was in force for 5 hr. 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 8, 2021, 6:46 PM MST (01:46 UTC)
- Expired
- Aug 8, 2021, 11:45 PM MST
- In force
- 5 hr
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Cochise County, AZ
The radar
The Tucson radar (KEMX), 46 km from the middle of the area, began a volume at 01:49 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 8, 8:13 PM MST | FLASH FLOOD | 1 N Saint David, AZ | DRAGOON WASH FLOWING OVER ROAD. BLOCKING VEHICLES FROM CROSSING. |
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, 1.8 hours before the alert went out and 76 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
- 742 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 2449 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -60 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
303
WGUS55 KTWC 090146
FFWTWC
AZC003-090445-
/O.NEW.KTWC.FF.W.0096.210809T0146Z-210809T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
646 PM MST Sun Aug 8 2021
The National Weather Service in Tucson has issued a
* Flash Flood Warning for...
West Central Cochise County in southeastern Arizona...
* Until 945 PM MST.
* At 646 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 2 inches of rain have fallen. Additional rainfall amounts up
to 1 inch are possible in the warned area. 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...
Benson, St. David and Kartchner Caverns State Park.
This includes the following Flash Flood Prone Locations...
Sibyl Rd at Gila/Dragoon Wash.
This includes the following streams and drainages...
Middle Canyon Wash, Dragoon Wash, Clifford Wash, San Pedro River,
Slavin Wash and Escalante Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3193 10997 3182 11003 3182 11017 3177 11036
3187 11037 3196 11029 3202 11022 3203 11017
3201 11014 3202 11009 3198 11001
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JRM3 follow-up statements
061
WGUS75 KTWC 090226
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
726 PM MST Sun Aug 8 2021
AZC003-090445-
/O.CON.KTWC.FF.W.0096.000000T0000Z-210809T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
726 PM MST Sun Aug 8 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM MST THIS
EVENING FOR WEST CENTRAL COCHISE COUNTY...
At 726 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms produced heavy rain across the warned area. Between 1
and 2 inches of rain have fallen. Additional rainfall amounts up to
0.25 inch are possible in the warned area. Flash flooding is ongoing
or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Benson, St. David and Kartchner Caverns State Park.
This includes the following Flash Flood Prone Locations...
Sibyl Rd at Gila/Dragoon Wash.
This includes the following streams and drainages...
Middle Canyon Wash, Dragoon Wash, Clifford Wash, San Pedro River,
Slavin Wash and Escalante Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3193 10997 3182 11003 3182 11017 3177 11036
3187 11037 3196 11029 3202 11022 3203 11017
3201 11014 3202 11009 3198 11001
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JRM512
WGUS55 KTWC 090321
FFWTWC
AZC003-090645-
/O.EXT.KTWC.FF.W.0096.000000T0000Z-210809T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
821 PM MST Sun Aug 8 2021
The National Weather Service in Tucson has extended the
* Flash Flood Warning for...
West Central Cochise County in southeastern Arizona...
* Until 1145 PM MST.
* At 821 PM MST, Doppler radar indicated additional thunderstorms
with heavy rain developing in the warned area. Trained weather
spotters also reported flash flooding along Dragoon and Gila Wash
in the vicinity of St. David and Sibyl Road. Between 1 and 3
inches of rain have fallen. Additional rainfall amounts of 0.5 to
1 inch are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Trained spotters reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Benson, St. David and Kartchner Caverns State Park.
This includes the following Flash Flood Prone Locations...
Sibyl Rd at Gila/Dragoon Wash.
This includes the following streams and drainages...
Middle Canyon Wash, Dragoon Wash, Clifford Wash, San Pedro River,
Slavin Wash and Escalante Wash.
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.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3193 10997 3182 11003 3182 11017 3177 11036
3187 11037 3196 11029 3202 11022 3203 11017
3201 11014 3202 11009 3198 11001
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JRM564
WGUS75 KTWC 090642
FFSTWC
Flash Flood Statement
National Weather Service Tucson AZ
1142 PM MST Sun Aug 8 2021
AZC003-090652-
/O.EXP.KTWC.FF.W.0096.000000T0000Z-210809T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
1142 PM MST Sun Aug 8 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1145 PM MST THIS EVENING FOR
WEST CENTRAL COCHISE COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3193 10997 3182 11003 3182 11017 3177 11036
3187 11037 3196 11029 3202 11022 3203 11017
3201 11014 3202 11009 3198 11001
$$The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 5:03 PM MST | Special Weather Statement | TWC | Cochise | 42 min |
| Aug 8, 5:18 PM MST | Special Weather Statement | TWC | Santa Cruz | 27 min |
| Aug 8, 5:22 PM MST | Special Weather Statement | TWC | Pima | 38 min |
| Aug 8, 5:22 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 38 min |
| Aug 8, 5:28 PM MST | Special Weather Statement | TWC | Cochise | 47 min |
| Aug 8, 5:51 PM MST | Special Weather Statement | TWC | Pima | 24 min |
| Aug 8, 6:09 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 66 min |
| Aug 8, 6:10 PM MST | Areal Flood Advisory | TWC | Pima | 2 hr |
| Aug 8, 6:13 PM MST | Special Weather Statement | TWC | Pima | 32 min |
| Aug 8, 6:14 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 20 min |
| Aug 8, 6:19 PM MST | Severe Thunderstorm Warning | TWC | Pima | 41 min |
| Aug 8, 6:37 PM MST | Areal Flood Advisory | TWC | Cochise | 5 hr |
| Aug 8, 6:56 PM MST | Dust Storm Advisory | TWC | Cochise, Pima, Pinal | 70 min |
| Aug 8, 8:45 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 45 min |
| Aug 8, 9:03 PM MST | Flash Flood Warning | TWC | Pima | 117 min |
| Aug 8, 9:28 PM MST | Areal Flood Advisory | TWC | Cochise, Pima, Santa Cruz | 2 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.