Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 137, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 31, 2021, 1:15 PM MST for Yavapai County, Arizona. It was in force for 4 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 31, 2021, 1:15 PM MST (20:15 UTC)
- Expired
- Jul 31, 2021, 5:15 PM MST
- In force
- 4 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 98 km from the middle of the area, began a volume at 20:17 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 31, 4:20 PM MST | FLASH FLOOD | 12 Nnw Jerome, AZ | VERDE RIVER GAUGE (YVPA3) REPORTS 2.5 FT RISE. |
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, 8.3 hours before the alert went out and 61 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
- 319 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 865 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- -25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
542
WGUS55 KFGZ 312015
FFWFGZ
AZC025-312315-
/O.NEW.KFGZ.FF.W.0137.210731T2015Z-210731T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
115 PM MST Sat Jul 31 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 415 PM MST.
* At 115 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. 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...
Perkinsville.
This includes the following streams and drainages...
Verde River, Munds Draw and Coyote Spring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
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 3480 11229 3492 11225 3491 11219 3475 11215
3471 11223
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT3 follow-up statements
469
WGUS75 KFGZ 312124
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
224 PM MST Sat Jul 31 2021
AZC025-312315-
/O.CON.KFGZ.FF.W.0137.000000T0000Z-210731T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
224 PM MST Sat Jul 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MST THIS
AFTERNOON FOR YAVAPAI COUNTY...
At 223 PM MST, Doppler radar indicated heavy rain has ended with
light to moderate rain continuing at this time. Between 2 and 5
inches of rain have fallen and will cause flooding along Munds Draw
to the Verde River.
HAZARD...Life-threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Perkinsville.
This includes the following streams and drainages...
Verde River, Munds Draw and Coyote Spring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
&&
LAT...LON 3480 11229 3492 11225 3491 11219 3475 11215
3471 11223
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT856
WGUS55 KFGZ 312301
FFWFGZ
AZC025-010015-
/O.EXT.KFGZ.FF.W.0137.000000T0000Z-210801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
401 PM MST Sat Jul 31 2021
The National Weather Service in Flagstaff has extended the
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 515 PM MST.
* At 358 PM MST, a stream gauge on the Verde River near Munds Draw
recorded over a 2 foot rise in water. Between 2 and 5 inches of
rain have fallen earlier with additional thunderstorms moving into
the area. Flooding will continue through Munds Draw to the Verde
River.
HAZARD...Life-threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Gauges reported.
IMPACT...Life-threatening flash flooding of low-water
crossings, creeks, normally dry washes and roads.
* Some locations that will experience flash flooding include...
Perkinsville.
This includes the following streams and drainages...
Verde River, Munds Draw and Coyote Spring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
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 3480 11229 3492 11225 3491 11219 3475 11215
3471 11223
FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT612
WGUS75 KFGZ 010007
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
507 PM MST Sat Jul 31 2021
AZC025-010017-
/O.EXP.KFGZ.FF.W.0137.000000T0000Z-210801T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
507 PM MST Sat Jul 31 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MST THIS AFTERNOON FOR
YAVAPAI COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3480 11229 3492 11225 3491 11219 3475 11215
3471 11223
$$
ETThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:06 PM MST | Special Weather Statement | FGZ | Gila | 39 min |
| Jul 31, 2:57 AM MST | Areal Flood Advisory | FGZ | Yavapai | 3 hr |
| Jul 31, 11:35 AM MST | Areal Flood Advisory | FGZ | Coconino | 115 min |
| Jul 31, 12:35 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Jul 31, 12:40 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Jul 31, 3:04 PM MST | Special Weather Statement | FGZ | 41 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.