Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 61, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 20, 2021, 8:55 PM MDT for Navajo County, Arizona. It was in force for 2 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 20, 2021, 8:55 PM MDT (02:55 UTC)
- Expired
- Jul 20, 2021, 11:00 PM MDT
- In force
- 2 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Navajo County, AZ
The radar
The Flagstaff radar (KFSX), 80 km from the middle of the area, began a volume at 02:54 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
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 2.9 hours before the alert went out and 151 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
- 716 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1279 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
914
WGUS55 KFGZ 210255
FFWFGZ
AZC017-210500-
/O.NEW.KFGZ.FF.W.0061.210721T0255Z-210721T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
755 PM MST Tue Jul 20 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Navajo County in north central Arizona...
* Until 1000 PM MST.
* At 754 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...
Dry Lake.
This includes the following highways...
State Route 377 between mile markers 8 and 15.
This includes the following streams and drainages...
Sevenmile Draw, Phoenix Park Wash, Scott Wash and Washboard 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.
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 3465 11033 3464 11020 3452 11027 3456 11043
3464 11041
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
TPS2 follow-up statements
953
WGUS75 KFGZ 210401
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
901 PM MST Tue Jul 20 2021
AZC017-210500-
/O.CON.KFGZ.FF.W.0061.000000T0000Z-210721T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Navajo AZ-
901 PM MST Tue Jul 20 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM MST THIS
EVENING FOR NAVAJO COUNTY...
At 900 PM MST, Doppler radar indicated thunderstorms producing heavy
rain have mostly diminished across the warned area. However, light
to moderate rain continues to fall. Between 1.5 and 2.5 inches of
rain have fallen. Additional rainfall amounts of 0.25 to 0.5 inches
are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Dry Lake.
This includes the following highways...
State Route 377 between mile markers 8 and 15.
This includes the following streams and drainages...
Sevenmile Draw, Phoenix Park Wash, Scott Wash and Washboard Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Flooding of washes and creeks will occur, some dirt roads will
become muddy and impassable. Paved roads and underpasses could
become flooded as well.
&&
LAT...LON 3465 11033 3464 11020 3452 11027 3456 11043
3464 11041
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
TPS492
WGUS75 KFGZ 210452
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
952 PM MST Tue Jul 20 2021
AZC017-210502-
/O.EXP.KFGZ.FF.W.0061.000000T0000Z-210721T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Navajo AZ-
952 PM MST Tue Jul 20 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM MST THIS EVENING FOR
NAVAJO COUNTY...
The heavy rain threat has ended near Dry Lake and State Highway 377.
Flows will remain high through creek and washes over the next few
hours so continue to use caution. Please continue to heed remaining
road closures.
LAT...LON 3465 11033 3464 11020 3452 11027 3456 11043
3464 11041
$$
TPSThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 7:16 PM MDT | Special Weather Statement | FGZ | 29 min | |
| Jul 20, 8:32 PM MDT | Severe Thunderstorm Warning | FGZ | Navajo | 28 min |
| Jul 20, 9:33 PM MDT | Flash Flood Warning | FGZ | Navajo | 117 min |
| Jul 21, 1:17 AM MDT | Flash Flood Warning | FGZ | Gila | 118 min |
| Jul 21, 3:38 AM MDT | Flash Flood Watch | FGZ | Apache, Coconino, Gila, Navajo, Yavapai | 5 days |
| Jul 21, 11:19 AM MDT | Special Weather Statement | FGZ | Yavapai | 26 min |
| Jul 21, 11:48 AM MDT | Flash Flood Warning | FGZ | Yavapai | 2 hr |
| Jul 21, 1:03 PM MDT | Special Weather Statement | FGZ | Yavapai | 42 min |
| Jul 21, 1:13 PM MDT | Flash Flood Warning | FGZ | Yavapai | 56 min |
| Jul 21, 1:20 PM MDT | Flash Flood Warning | FGZ | Yavapai | 114 min |
| Jul 21, 1:35 PM MDT | Special Weather Statement | FGZ | 40 min | |
| Jul 21, 1:47 PM MDT | Flash Flood Warning | FGZ | Coconino | 118 min |
| Jul 21, 1:54 PM MDT | Special Weather Statement | FGZ | 36 min | |
| Jul 21, 2:06 PM MDT | Flash Flood Warning | FGZ | Coconino | 92 min |
| Jul 21, 2:24 PM MDT | Flash Flood Warning | FGZ | Coconino | 110 min |
| Jul 21, 2:27 PM MDT | Flash Flood Warning | FGZ | Yavapai | 74 min |
| Jul 21, 2:57 PM MDT | Special Weather Statement | FGZ | Yavapai | 48 min |
| Jul 21, 3:01 PM MDT | Areal Flood Advisory | FGZ | Yavapai | 119 min |
| Jul 21, 3:05 PM MDT | Flash Flood Warning | FGZ | Coconino | 2 hr |
| Jul 21, 3:22 PM MDT | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Jul 21, 3:30 PM MDT | Special Weather Statement | FGZ | 45 min | |
| Jul 21, 3:36 PM MDT | Flash Flood Warning | FGZ | Yavapai | 54 min |
| Jul 21, 3:53 PM MDT | Flash Flood Warning | FGZ | Coconino | 82 min |
| Jul 21, 3:57 PM MDT | Flash Flood Warning | FGZ | Yavapai | 60 min |
| Jul 21, 3:59 PM MDT | Flash Flood Warning | FGZ | Yavapai | 60 min |
| Jul 21, 4:21 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 26 min |
| Jul 21, 4:34 PM MDT | Flash Flood Warning | FGZ | Coconino | 98 min |
| Jul 21, 4:49 PM MDT | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Jul 21, 5:35 PM MDT | 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.