Alert archive / Arizona / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 142, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 14, 2018, 1:31 PM MST for Coconino County, Arizona. It was in force for 20 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
- Aug 14, 2018, 1:31 PM MST (20:31 UTC)
- Expired
- Aug 14, 2018, 1:51 PM MST
- In force
- 20 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 1.25 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 20:34 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.5 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
- 89 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1840 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 99 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 Aug 14, 10:28 AM MST, 3 hours 3 minutes earlier.
Area forecast discussion, Aug 14, 10:28 AM MST, 3 hours 3 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Local storm report, Aug 14, 8:56 AM MST, 4 hours 35 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Special weather statement, Aug 14, 12:06 PM MST, 1 hour 25 minutes before
Special Weather Statement National Weather Service Flagstaff AZ 1206 PM MST TUE AUG 14 2018 AZZ012-015-141930- Little Colorado River Valley in Coconino County-Western Mogollon Rim- 1206 PM MST TUE AUG 14 2018 ...SIGNIFICANT WEATHER ADVISORY FOR COCONINO COUNTY UNTIL 1230 PM MST... At 1205 PM MST, Doppler radar was tracking a strong thunderstorm near Doney Park, or 11 miles northeast of Flagstaff. this storm was nearly stationary. Dime size hail and winds to 40 mph will be possible with this storm. Locations impacted include... Sunset Crater Volcano National Monument and Doney Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3534 11136 3521 11144 3527 11154 3539 11153 TIME...MOT...LOC 1905Z 130DEG 0KT 3531 11147 KD
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 5:15 PM MST | Areal Flood Advisory | FGZ | Yavapai | 2 hr |
| Aug 13, 6:44 PM MST | Special Weather Statement | FGZ | 46 min | |
| Aug 13, 6:53 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 22 min |
| Aug 13, 7:06 PM MST | Special Weather Statement | FGZ | 24 min | |
| Aug 13, 7:23 PM MST | Severe Thunderstorm Warning | FGZ | Apache, Navajo | 37 min |
| Aug 13, 7:42 PM MST | Severe Thunderstorm Warning | FGZ | Apache, Navajo | 33 min |
| Aug 13, 8:14 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 31 min |
| Aug 13, 8:22 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 23 min |
| Aug 14, 12:06 PM MST | Special Weather Statement | FGZ | 24 min | |
| Aug 14, 1:37 PM MST | Special Weather Statement | FGZ | Yavapai | 23 min |
| Aug 14, 2:40 PM MST | Special Weather Statement | FGZ | 35 min | |
| Aug 14, 2:51 PM MST | Special Weather Statement | FGZ | 24 min | |
| Aug 14, 3:02 PM MST | Areal Flood Advisory | FGZ | Coconino | 118 min |
| Aug 14, 3:40 PM MST | Areal Flood Advisory | FGZ | Gila | 3 hr |
| Aug 14, 3:47 PM MST | Severe Thunderstorm Warning | FGZ | Gila, Navajo | 28 min |
| Aug 14, 4:01 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 22 min |
| Aug 14, 4:58 PM MST | Special Weather Statement | FGZ | 32 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.