Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 162, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 10, 2021, 2:43 PM MST for Yavapai County, Arizona. It was in force for 3 hr. 4 reports 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
- Aug 10, 2021, 2:43 PM MST (21:43 UTC)
- Expired
- Aug 10, 2021, 5:45 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 Flagstaff radar (KFSX), 114 km from the middle of the area, began a volume at 21:44 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 |
|---|---|---|---|
| Aug 10, 2:52 PM MST | FLASH FLOOD | 1 Nw Prescott Courthous, AZ | ROAD CLOSED AT LINCOLN AVE AND GROVE AVE DUE TO FLOODING. OTHER ROAD CLOSURES AROUND TOWN BETWEEN 2:50 AND 3:50 PM INCLUDED 1ST ST. SOUTH OF MERRITT, HILLSIDE AND 2ND ST., AND S. RUSH ST. |
| Aug 10, 3:49 PM MST | FLASH FLOOD | 2 Ne Prescott Courthous, AZ | A STREAM GAUGE ON GRANITE CREEK NORTHEAST OF DOWNTOWN PRESCOTT (GRCA3) REPORTED A 6.7 FT RISE WITH A PEAK FLOW OF 3,558 CUBIC FT PER SECOND. |
| Aug 10, 3:51 PM MST | FLASH FLOOD | 1 Nne Prescott Courthou, AZ | A STREAM GAUGE ON GRANITE CREEK NEAR DOWNTOWN PRESCOTT (GCRA3) REPORTED A 4.4 FOOT RISE WITH A PEAK FLOW OF 1,595 CUBIC FT PER SECOND. |
| Aug 10, 4:39 PM MST | FLASH FLOOD | 1 Nnw Paulden, AZ | TWO CARS WERE STUCK IN WASHES NEAR CHINO VALLEY/PAULDEN DUE TO HIGH WATER. WATER WAS BEGINNING TO MOVE THE VEHICLES AND LAW ENFORCEMENT WAS CALLED TO THE SCENE. |
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, 9.7 hours before the alert went out and 83 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
- 609 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 962 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
331
WGUS55 KFGZ 102143
FFWFGZ
AZC025-110045-
/O.NEW.KFGZ.FF.W.0162.210810T2143Z-210811T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
243 PM MST Tue Aug 10 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 545 PM MST.
* At 242 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.5 inches of
rain have fallen. Additional rainfall amounts of 1 to 2 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...
Chino Valley, Prescott, Prescott Valley, Williamson Valley,
Paulden, Yavapai Campground, Indian Hill West Prescott, Oak Knoll
Village, Groom Creek Subdivision, Ponderosa Park, Lynx Lake Dam,
White Spar Campground, Upper Wolf Creek Group Campground and Lower
Wolf Creek Campground.
This includes the following swimming holes...
Wolf Creek Falls.
This includes the following highways...
State Route 69 between mile markers 283 and 296.
State Route 89 between mile markers 301 and 349.
State Route 89A between mile markers 318 and 327.
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 3453 11257 3465 11257 3490 11257 3505 11262
3507 11248 3502 11237 3493 11234 3474 11234
3467 11227 3456 11223 3454 11227 3447 11237
3444 11246 3444 11253
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Humphreys2 follow-up statements
395
WGUS75 KFGZ 102231
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
331 PM MST Tue Aug 10 2021
AZC025-110045-
/O.CON.KFGZ.FF.W.0162.000000T0000Z-210811T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
331 PM MST Tue Aug 10 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST THIS
AFTERNOON FOR YAVAPAI COUNTY...
At 329 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain. Between 1 and 2.25 inches of
rain have fallen. Additional rainfall amounts of 0.5 to 1.5 inches
are possible in the warned area. Flooding is already ongoing along
Granite Creek near Prescott.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Chino Valley, Prescott, Prescott Valley, Williamson Valley,
Paulden, Yavapai Campground, Indian Hill West Prescott, Oak Knoll
Village, Groom Creek Subdivision, Ponderosa Park, Lynx Lake Dam,
White Spar Campground, Upper Wolf Creek Group Campground and Lower
Wolf Creek Campground.
This includes the following swimming holes...
Wolf Creek Falls.
This includes the following highways...
State Route 69 between mile markers 283 and 296.
State Route 89 between mile markers 301 and 349.
State Route 89A between mile markers 318 and 327.
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 3453 11257 3465 11257 3490 11257 3505 11262
3507 11248 3502 11237 3493 11234 3474 11234
3467 11227 3456 11223 3454 11227 3447 11237
3444 11246 3444 11253
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Humphreys395
WGUS75 KFGZ 110037
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
537 PM MST Tue Aug 10 2021
AZC025-110047-
/O.EXP.KFGZ.FF.W.0162.000000T0000Z-210811T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
537 PM MST Tue Aug 10 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST THIS AFTERNOON FOR
PAULDEN, CHINO VALLEY, AND PRESCOTT IN YAVAPAI COUNTY...
Flood waters have receded and the heavy rain has ended. Flooding is
no longer expected to pose a threat. A few area creeks and washes
may remain high, so continue to use caution. Please continue to heed
remaining road closures.
LAT...LON 3453 11257 3465 11257 3490 11257 3505 11262
3507 11248 3502 11237 3493 11234 3474 11234
3467 11227 3456 11223 3454 11227 3447 11237
3444 11246 3444 11253
$$
HumphreysThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:19 PM MST | Special Weather Statement | FGZ | 41 min | |
| Aug 9, 6:17 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 9, 6:56 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 34 min |
| Aug 9, 7:27 PM MST | Special Weather Statement | FGZ | 33 min | |
| Aug 9, 7:50 PM MST | Special Weather Statement | FGZ | Gila | 25 min |
| Aug 9, 8:44 PM MST | Special Weather Statement | FGZ | Gila | 46 min |
| Aug 9, 9:18 PM MST | Areal Flood Advisory | FGZ | Gila, Navajo | 3 hr |
| Aug 9, 9:32 PM MST | Special Weather Statement | FGZ | Gila | 43 min |
| Aug 10, 11:35 AM MST | Special Weather Statement | FGZ | 25 min | |
| Aug 10, 11:55 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 15 min |
| Aug 10, 12:02 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 10, 12:14 PM MST | Special Weather Statement | FGZ | 31 min | |
| Aug 10, 12:46 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 10, 12:59 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 10, 1:22 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 53 min |
| Aug 10, 2:22 PM MST | Special Weather Statement | FGZ | Yavapai | 23 min |
| Aug 10, 2:26 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 32 min |
| Aug 10, 2:35 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 40 min |
| Aug 10, 2:52 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 38 min |
| Aug 10, 3:11 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 10, 3:46 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 10, 4:13 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
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.