Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 73, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 21, 2021, 2:53 PM MST for Coconino County, Arizona. It was in force for 82 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
- Jul 21, 2021, 2:53 PM MST (21:53 UTC)
- Expired
- Jul 21, 2021, 4:15 PM MST
- In force
- 82 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 128 km from the middle of the area, began a volume at 21:55 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 21, 3:00 PM MST | FLASH FLOOD | 1 Ssw Williams, AZ | FLOODED ROAD AT LEWIS STREET IN WILLIAMS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.9 hours before the alert went out and 44 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
- 77 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 1785 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
284
WGUS55 KFGZ 212153
FFWFGZ
AZC005-220100-
/O.NEW.KFGZ.FF.W.0073.210721T2153Z-210722T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
253 PM MST Wed Jul 21 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Coconino County in north central Arizona...
* Until 600 PM MST.
* At 253 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 0.75 to 1.5 inches 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.
IMPACT...Life-threatening flash flooding of low-water
crossings, creeks, normally dry washes and roads.
* Some locations that will experience flash flooding include...
Williams, Kaibab Lake Campground and Dogtown Lake Campground.
This includes the following highways...
Business Interstate 40 between mile markers 163 and 165.
State Route 64 between mile markers 186 and 187.
Interstate 40 between mile markers 158 and 167.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
&&
LAT...LON 3546 11238 3549 11225 3515 11207 3509 11224
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL2 follow-up statements
970
WGUS75 KFGZ 212229
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
329 PM MST Wed Jul 21 2021
AZC005-220100-
/O.CON.KFGZ.FF.W.0073.000000T0000Z-210722T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
329 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING
FOR COCONINO COUNTY...
At 327 PM MST, Doppler radar indicated the heavy rain has moved out
of the warned area, however flash flooding is likely as water
drains. Between 1 and 2 inches of rain have fallen.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Williams, Kaibab Lake Campground and Dogtown Lake Campground.
This includes the following highways...
Business Interstate 40 between mile markers 163 and 165.
State Route 64 between mile markers 186 and 187.
Interstate 40 between mile markers 158 and 167.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
&&
LAT...LON 3546 11238 3549 11225 3515 11207 3509 11224
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL844 WGUS75 KFGZ 212315 FFSFGZ Flash Flood Statement National Weather Service Flagstaff AZ 415 PM MST Wed Jul 21 2021 AZC005-212325- /O.CAN.KFGZ.FF.W.0073.000000T0000Z-210722T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coconino AZ- 415 PM MST Wed Jul 21 2021 ...FLASH FLOOD WARNING BETWEEN ASH FORK AND WILLIAMS IN COCONINO COUNTY IS CANCELLED... The heavy rain has ended. Light to moderate rain is occurring across the warned area, however flooding is no longer expected to pose a threat. Please continue to heed remaining road closures and take it slow while driving along I-40 in this area. LAT...LON 3546 11238 3549 11225 3515 11207 3509 11224 $$ EL
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:16 PM MST | Special Weather Statement | FGZ | 29 min | |
| Jul 20, 7:32 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 28 min |
| Jul 20, 7:55 PM MST | Flash Flood Warning | FGZ | Navajo | 2 hr |
| Jul 20, 8:33 PM MST | Flash Flood Warning | FGZ | Navajo | 117 min |
| Jul 21, 12:17 AM MST | Flash Flood Warning | FGZ | Gila | 118 min |
| Jul 21, 2:38 AM MST | Flash Flood Watch | FGZ | Apache, Coconino, Gila, Navajo, Yavapai | 5 days |
| Jul 21, 10:19 AM MST | Special Weather Statement | FGZ | Yavapai | 26 min |
| Jul 21, 10:48 AM MST | Flash Flood Warning | FGZ | Yavapai | 2 hr |
| Jul 21, 12:03 PM MST | Special Weather Statement | FGZ | Yavapai | 42 min |
| Jul 21, 12:13 PM MST | Flash Flood Warning | FGZ | Yavapai | 56 min |
| Jul 21, 12:20 PM MST | Flash Flood Warning | FGZ | Yavapai | 114 min |
| Jul 21, 12:35 PM MST | Special Weather Statement | FGZ | 40 min | |
| Jul 21, 12:47 PM MST | Flash Flood Warning | FGZ | Coconino | 118 min |
| Jul 21, 12:54 PM MST | Special Weather Statement | FGZ | 36 min | |
| Jul 21, 1:06 PM MST | Flash Flood Warning | FGZ | Coconino | 92 min |
| Jul 21, 1:24 PM MST | Flash Flood Warning | FGZ | Coconino | 110 min |
| Jul 21, 1:27 PM MST | Flash Flood Warning | FGZ | Yavapai | 74 min |
| Jul 21, 1:57 PM MST | Special Weather Statement | FGZ | Yavapai | 48 min |
| Jul 21, 2:01 PM MST | Areal Flood Advisory | FGZ | Yavapai | 119 min |
| Jul 21, 2:05 PM MST | Flash Flood Warning | FGZ | Coconino | 2 hr |
| Jul 21, 2:22 PM MST | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Jul 21, 2:30 PM MST | Special Weather Statement | FGZ | 45 min | |
| Jul 21, 2:36 PM MST | Flash Flood Warning | FGZ | Yavapai | 54 min |
| Jul 21, 2:57 PM MST | Flash Flood Warning | FGZ | Yavapai | 60 min |
| Jul 21, 2:59 PM MST | Flash Flood Warning | FGZ | Yavapai | 60 min |
| Jul 21, 3:21 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 26 min |
| Jul 21, 3:34 PM MST | Flash Flood Warning | FGZ | Coconino | 98 min |
| Jul 21, 3:49 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Jul 21, 4:35 PM MST | Flash Flood Warning | FGZ | Coconino | 115 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.