Alert archive / Arizona / Flash Flood Warnings in 2024
Flash Flood Warning 85, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 22, 2024, 3:14 PM MST for Coconino 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 counties it named.
The facts
- Issued
- Aug 22, 2024, 3:14 PM MST (22:14 UTC)
- Expired
- Aug 22, 2024, 6:15 PM MST
- In force
- 3 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), 150 km from the middle of the area, began a volume at 22:14 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 12:00Z, 10.2 hours before the alert went out and 68 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
- 264 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1001 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Flagstaff, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 22, 2:00 PM MST, 1 hour 14 minutes earlier.
Area forecast discussion, Aug 22, 2:00 PM MST, 1 hour 14 minutes before
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Special weather statement, Aug 22, 11:57 AM MST, 3 hours 17 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
1157 AM MST Thu Aug 22 2024
AZZ006-007-221945-
Coconino Plateau-Grand Canyon Country-
1157 AM MST Thu Aug 22 2024
...A STRONG THUNDERSTORM WILL IMPACT COCONINO COUNTY THROUGH 1245 PM
MST...
At 1154 AM MST, Doppler radar was tracking a strong thunderstorm
near Supai, or 30 miles west of Hermits Rest, moving northeast at 10
mph.
HAZARD...Torrential rain over Hualapai and Havasu Creeks, wind gusts
up to 40 mph and penny size hail. Flash flooding is
possible.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Hualapai Hilltop, Beaver Falls, Little Navajo Falls, Mooney Falls,
Supai, and Havasupai Reservation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3612 11277 3614 11280 3617 11280 3623 11277
3627 11276 3631 11276 3631 11273 3618 11264
3615 11268
TIME...MOT...LOC 1854Z 235DEG 10KT 3619 11274
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
McCollumLocal storm report, Aug 22, 2:07 PM MST, 1 hour 7 minutes before
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</html>The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 5:03 PM MST | Flash Flood Warning | FGZ | Coconino | 6 hr |
| Aug 22, 4:49 AM MST | Special Weather Statement | FGZ | 26 min | |
| Aug 22, 11:57 AM MST | Special Weather Statement | FGZ | 48 min | |
| Aug 22, 12:03 PM MST | Flash Flood Warning | FGZ | Coconino | 14 hr |
| Aug 22, 12:56 PM MST | Flash Flood Warning | FGZ | Apache | 5 hr |
| Aug 22, 2:59 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
Nearby
Flash Flood Warnings in Arizona, 2024Every flash flood warning in 2024
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.