Alert archive / Arizona / Flash Flood Warnings in 2023
Flash Flood Warning 31, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 12, 2023, 11:31 AM MST for Coconino County, Arizona. It was in force for 4 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 12, 2023, 11:31 AM MST (18:31 UTC)
- Expired
- Aug 12, 2023, 4:00 PM MST
- In force
- 4 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 18:34 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
Las Vegas, NV (KVEF), launched 12:00Z, 6.5 hours before the alert went out and 344 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
- 230 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 2955 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 132 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 12, 9:15 AM MST, 2 hours 16 minutes earlier.
Area forecast discussion, Aug 12, 9:15 AM MST, 2 hours 16 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 11, 5:37 PM MST | Flash Flood Warning | FGZ | Coconino, Navajo | 6 hr |
| Aug 11, 6:29 PM MST | Special Weather Statement | FGZ | Coconino | 31 min |
| Aug 11, 6:47 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 28 min |
| Aug 11, 7:17 PM MST | Special Weather Statement | FGZ | 58 min | |
| Aug 11, 7:35 PM MST | Flash Flood Warning | FGZ | Coconino | 4 hr |
| Aug 11, 8:03 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 42 min |
| Aug 12, 12:14 AM MST | Flash Flood Warning | FGZ | Yavapai | 8 hr |
| Aug 12, 1:10 AM MST | Flash Flood Warning | FGZ | Yavapai | 8 hr |
| Aug 12, 11:57 AM MST | Special Weather Statement | FGZ | 33 min | |
| Aug 12, 1:05 PM MST | Flash Flood Warning | FGZ | Coconino, Gila | 3 hr |
| Aug 12, 2:07 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 20 min |
Nearby
Flash Flood Warnings in Arizona, 2023Every flash flood warning in 2023
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.