Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 71, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 21, 2021, 2:05 PM MST for Coconino County, Arizona. It was in force for 2 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
- Jul 21, 2021, 2:05 PM MST (21:05 UTC)
- Expired
- Jul 21, 2021, 4:08 PM MST
- In force
- 2 hr
- 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), 107 km from the middle of the area, began a volume at 21:07 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, 9.1 hours before the alert went out and 20 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.
852
WGUS55 KFGZ 212105
FFWFGZ
AZC005-220015-
/O.NEW.KFGZ.FF.W.0071.210721T2105Z-210722T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
205 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 515 PM MST.
* At 205 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 1.25 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, Parks, Dogtown Lake Campground and Kaibab Lake
Campground.
This includes the following highways...
Business Interstate 40 between mile markers 164 and 165.
State Route 64 between mile markers 186 and 189.
Interstate 40 between mile markers 164 and 178.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding of washes and creeks will occur, some dirt roads will
become muddy and impassable. Paved roads and underpasses could
become flooded as well.
&&
LAT...LON 3535 11195 3524 11193 3523 11193 3516 11202
3519 11216 3532 11221
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL2 follow-up statements
732
WGUS75 KFGZ 212143
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
243 PM MST Wed Jul 21 2021
AZC005-220015-
/O.CON.KFGZ.FF.W.0071.000000T0000Z-210722T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
243 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MST THIS
AFTERNOON FOR COCONINO COUNTY...
At 243 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. The heaviest rain has shifted westward
over Williams. Between 1.25 and 2 inches of rain have fallen.
Additional rainfall amounts of 0.25 to 0.75 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Williams, Parks, Dogtown Lake Campground and Kaibab Lake
Campground.
This includes the following highways...
Business Interstate 40 between mile markers 164 and 165.
State Route 64 between mile markers 186 and 190.
Interstate 40 between mile markers 164 and 178.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding of washes and creeks will occur, some dirt roads will
become muddy and impassable. Paved roads and underpasses could
become flooded as well.
&&
LAT...LON 3535 11195 3524 11193 3523 11193 3516 11202
3519 11216 3532 11221
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL670
WGUS75 KFGZ 212308
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
408 PM MST Wed Jul 21 2021
AZC005-212318-
/O.CAN.KFGZ.FF.W.0071.000000T0000Z-210722T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
408 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING BETWEEN PARKS AND WILLIAMS ALONG I-40 IN
COCONINO COUNTY IS CANCELLED...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3535 11195 3524 11193 3523 11193 3516 11202
3519 11216 3532 11221
$$
ELThe 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, 2:22 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, 2:53 PM MST | Flash Flood Warning | FGZ | Coconino | 82 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.