Alert archive / Arizona / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 189, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Oct 21, 2018, 1:01 PM MST for Coconino County, Arizona. It was in force for 14 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 21, 2018, 1:01 PM MST (20:01 UTC)
- Expired
- Oct 21, 2018, 1:15 PM MST
- In force
- 14 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 20:01 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, 8.0 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
- 358 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1094 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Oct 21, 10:42 AM MST, 2 hours 19 minutes earlier.
Area forecast discussion, Oct 21, 10:42 AM MST, 2 hours 19 minutes before
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Special weather statement, Oct 21, 7:27 AM MST, 5 hours 34 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 |
|---|---|---|---|---|
| Oct 21, 5:43 AM MST | Special Weather Statement | FGZ | Yavapai | 47 min |
| Oct 21, 6:39 AM MST | Special Weather Statement | FGZ | 51 min | |
| Oct 21, 7:27 AM MST | Special Weather Statement | FGZ | 48 min | |
| Oct 21, 8:19 AM MST | Special Weather Statement | FGZ | 41 min | |
| Oct 21, 12:44 PM MST | Areal Flood Advisory | FGZ | Apache | 3 hr |
| Oct 21, 2:07 PM MST | Tornado Warning | FGZ | Coconino | 23 min |
| Oct 21, 2:40 PM MST | Special Weather Statement | FGZ | Navajo | 50 min |
| Oct 21, 2:57 PM MST | Special Weather Statement | FGZ | Coconino | 48 min |
| Oct 21, 3:06 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 39 min |
| Oct 21, 3:44 PM MST | Flash Flood Warning | FGZ | Navajo | 3 hr |
| Oct 21, 4:32 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 28 min |
| Oct 21, 4:55 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 35 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2018Every severe thunderstorm warning in 2018
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.