Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 77, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 21, 2021, 3:49 PM MST for Yavapai 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 21, 2021, 3:49 PM MST (22:49 UTC)
- Expired
- Jul 21, 2021, 7:00 PM MST
- In force
- 3 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Yavapai County, AZ
The radar
The Phoenix radar (KIWA), 162 km from the middle of the area, began a volume at 22:49 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.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 12:00Z, 10.8 hours before the alert went out and 131 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
- 5 J/kg
- Mixed-layer CIN
- -244 J/kg
- Mixed-layer LCL
- 2438 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
101
WGUS55 KFGZ 212249
FFWFGZ
AZC025-220200-
/O.NEW.KFGZ.FF.W.0077.210721T2249Z-210722T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
349 PM MST Wed Jul 21 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 700 PM MST.
* At 348 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life-threatening 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...
Congress.
This includes the following highways...
Highway 93 between mile markers 164 and 196.
State Route 89 between mile markers 258 and 271.
State Route 71 between mile markers 90 and 109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3435 11318 3430 11284 3399 11272 3400 11329
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
McCollum2 follow-up statements
676
WGUS75 KFGZ 212357
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
457 PM MST Wed Jul 21 2021
AZC025-220200-
/O.CON.KFGZ.FF.W.0077.000000T0000Z-210722T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
457 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING
FOR YAVAPAI COUNTY...
At 455 PM MST, Doppler radar indicated thunderstorms producing heavy
rain continued over portions of the warned area south to southwest
of Congress. Between 2 and 3 inches of rain have fallen across
portions of Highway 93 . Flash flooding is ongoing.
HAZARD...Thunderstorms producing flash flooding.
SOURCE...Radar.
IMPACT...Flash flooding of low-water crossings, creeks, normally
dry washes and roads.
Some locations that will experience flash flooding include...
Congress.
This includes the following highways...
Highway 93 between mile markers 163 and 196.
State Route 89 between mile markers 258 and 271.
State Route 71 between mile markers 90 and 109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3435 11318 3430 11284 3399 11272 3400 11329
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
McCollum454 WGUS75 KFGZ 220203 FFSFGZ Flash Flood Statement National Weather Service Flagstaff AZ 703 PM MST Wed Jul 21 2021 AZC025-220213- /O.EXP.KFGZ.FF.W.0077.000000T0000Z-210722T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Yavapai AZ- 703 PM MST Wed Jul 21 2021 ...FLASH FLOOD WARNING HAS EXPIRED FOR YAVAPAI COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3435 11318 3430 11284 3399 11272 3400 11329 $$ McCollum
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, 2:53 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.