Alert archive / Colorado / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 9, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Jun 5, 2020, 7:41 PM MDT for Garfield County, Mesa County, Colorado; Grand County, Utah. It was in force for 34 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
- Jun 5, 2020, 7:41 PM MDT (01:41 UTC)
- Expired
- Jun 5, 2020, 8:15 PM MDT
- In force
- 34 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
Counties Garfield County, CO, Mesa County, CO, Grand County, UT
The radar
The Grand Junction radar (KGJX), 40 km from the middle of the area, began a volume at 01:41 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
Grand Junction, CO (KGJT), launched 00:00Z, 1.7 hours before the alert went out and 15 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
- 102 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 4370 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- -7 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 Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 5, 5:42 PM MDT, 1 hour 59 minutes earlier.
Area forecast discussion, Jun 5, 5:42 PM MDT, 1 hour 59 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>Hazardous weather outlook, Jun 5, 3:51 PM MDT, 3 hours 50 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 351 PM MDT Fri Jun 5 2020 COZ001>014-017>023-UTZ022>025-027>029-062200- Lower Yampa River Basin-Central Yampa River Basin- Roan and Tavaputs Plateaus-Elkhead and Park Mountains- Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor- Central Colorado River Basin-Grand and Battlement Mesas- Gore and Elk Mountains/Central Mountain Valleys- Central Gunnison and Uncompahgre River Basin- West Elk and Sawatch Mountains-Flat Tops- Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide- Northwest San Juan Mountains-Southwest San Juan Mountains- Paradox Valley/Lower Dolores River- Four Corners/Upper Dolores River-Animas River Basin- San Juan River Basin-Southeast Utah-Eastern Uinta Mountains- Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat- La Sal and Abajo Mountains-Canyonlands/Natural Bridges- 351 PM MDT Fri Jun 5 2020 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...This Afternoon and Tonight Showers and storms will start increasing in coverage today ahead of a strong system to our southwest. Ahead of this system, surface winds will increase while dry conditions remain in place. Red Flag Warnings remain in effect to account for these conditions. .DAYS TWO THROUGH SEVEN...Saturday through Thursday The system will be moving over the forecast area Saturday bringing rain, heavy at times, along with some thunderstorms. The heavy rain will increase chances for flash flooding, especially over canyon country and recent burn scars, so a Flash Flood Watch is in effect for eastern Utah and southwest Colorado beginning midnight tonight through 4 pm Saturday. Gusty winds and hail will be possible through the day under the stronger thunderstorms. Once the storm moves out, expect much cooler temperatures to start the new work week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
In the hours before
Special weather statement, Jun 5, 6:39 PM MDT, 1 hour 2 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, Jun 5, 7:07 PM MDT, 34 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, Jun 5, 7:10 PM MDT, 31 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>Local storm report, Jun 5, 7:27 PM MDT, 14 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>Local storm report, Jun 5, 7:30 PM MDT, 11 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>Local storm report, Jun 5, 7:31 PM MDT, 10 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>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 7:07 PM MDT | Special Weather Statement | GJT | Delta, Mesa | 38 min |
| Jun 5, 8:22 PM MDT | Special Weather Statement | GJT | Garfield, Rio Blanco | 38 min |
| Jun 5, 9:26 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 34 min |
| Jun 5, 10:01 PM MDT | Special Weather Statement | GJT | Moffat | 29 min |
| Jun 6, 2:16 AM MDT | Wind Advisory | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 9 more | 18 hr |
| Jun 6, 9:45 AM MDT | Special Weather Statement | GJT | 30 min | |
| Jun 6, 10:24 AM MDT | Severe Thunderstorm Warning | GJT | Montrose, San Miguel | 36 min |
| Jun 6, 10:36 AM MDT | Special Weather Statement | GJT | Dolores, Montezuma | 24 min |
| Jun 6, 10:44 AM MDT | Severe Thunderstorm Warning | GJT | Dolores, Montezuma | 31 min |
| Jun 6, 10:53 AM MDT | Severe Thunderstorm Warning | GJT | Dolores, Mesa, Montrose, San Miguel | 22 min |
| Jun 6, 10:59 AM MDT | Special Weather Statement | GJT | La Plata | 46 min |
| Jun 6, 11:13 AM MDT | Severe Thunderstorm Warning | GJT | Dolores, Montezuma, San Miguel | 47 min |
| Jun 6, 11:18 AM MDT | Severe Thunderstorm Warning | GJT | Delta, Mesa, Montrose, San Miguel | 27 min |
| Jun 6, 11:19 AM MDT | Severe Thunderstorm Warning | GJT | Garfield, Mesa | 41 min |
| Jun 6, 11:35 AM MDT | Severe Thunderstorm Warning | GJT | Delta, Garfield, Mesa, Montrose, Rio Blanco | 25 min |
| Jun 6, 11:47 AM MDT | Special Weather Statement | GJT | Ouray, San Juan | 43 min |
| Jun 6, 11:55 AM MDT | Severe Thunderstorm Warning | GJT | Garfield, Mesa, Rio Blanco | 50 min |
| Jun 6, 11:56 AM MDT | Areal Flood Advisory | GJT | Mesa | 3 hr |
| Jun 6, 11:59 AM MDT | Severe Thunderstorm Warning | GJT | Delta, Garfield, Mesa, Montrose, Rio Blanco | 31 min |
| Jun 6, 12:01 PM MDT | Areal Flood Advisory | GJT | Delta | 3 hr |
| Jun 6, 12:28 PM MDT | Severe Thunderstorm Warning | GJT | Garfield, Mesa, Rio Blanco | 32 min |
| Jun 6, 12:34 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 41 min |
| Jun 6, 12:35 PM MDT | Special Weather Statement | GJT | Archuleta, Hinsdale, San Juan | 40 min |
| Jun 6, 12:39 PM MDT | Special Weather Statement | GJT | Delta | 36 min |
| Jun 6, 12:47 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 58 min |
| Jun 6, 12:59 PM MDT | Severe Thunderstorm Warning | GJT | Eagle, Garfield, Moffat, Rio Blanco, Routt | 31 min |
| Jun 6, 1:16 PM MDT | Special Weather Statement | GJT | Eagle | 44 min |
| Jun 6, 1:17 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 28 min |
| Jun 6, 1:28 PM MDT | Severe Thunderstorm Warning | GJT | Eagle, Garfield, Moffat, Rio Blanco, Routt | 32 min |
| Jun 6, 1:30 PM MDT | Special Weather Statement | GJT | Archuleta | 45 min |
| Jun 6, 1:38 PM MDT | Areal Flood Advisory | GJT | Moffat, Routt | 52 min |
| Jun 6, 1:38 PM MDT | Special Weather Statement | GJT | 52 min | |
| Jun 6, 1:55 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco, Routt | 35 min |
| Jun 6, 2:06 PM MDT | Special Weather Statement | GJT | Rio Blanco | 39 min |
| Jun 6, 2:10 PM MDT | Special Weather Statement | GJT | Eagle, Pitkin | 35 min |
| Jun 6, 2:15 PM MDT | Areal Flood Advisory | GJT | Archuleta | 3 hr |
| Jun 6, 2:25 PM MDT | Special Weather Statement | GJT | Archuleta | 35 min |
| Jun 6, 2:27 PM MDT | Special Weather Statement | GJT | 48 min | |
| Jun 6, 2:32 PM MDT | Areal Flood Advisory | GJT | Moffat, Rio Blanco | 118 min |
| Jun 6, 2:36 PM MDT | Red Flag Warning | GJT | Delta, Dolores, Garfield, La Plata, Mesa, Montezuma and 3 more | 31 hr |
| Jun 6, 2:46 PM MDT | Special Weather Statement | GJT | Eagle, Pitkin | 29 min |
| Jun 6, 2:54 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 13 min |
| Jun 6, 3:08 PM MDT | Areal Flood Advisory | GJT | Hinsdale, La Plata, San Juan | 5 hr |
| Jun 6, 4:46 PM MDT | River Flood Advisory | GJT | La Plata | 44 hr |
| Jun 5, 6:39 PM MDT | Special Weather Statement | GJT | San Juan | 51 min |
| Jun 5, 7:10 PM MDT | Special Weather Statement | GJT | Grand | 50 min |
| Jun 5, 7:27 PM MDT | Severe Thunderstorm Warning | GJT | Grand | 33 min |
| Jun 5, 8:02 PM MDT | Special Weather Statement | GJT | Uintah | 43 min |
| Jun 5, 9:32 PM MDT | Special Weather Statement | GJT | Daggett | 43 min |
| Jun 6, 8:59 AM MDT | Special Weather Statement | GJT | San Juan | 31 min |
| Jun 6, 9:29 AM MDT | Severe Thunderstorm Warning | GJT | San Juan | 31 min |
| Jun 6, 9:38 AM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
| Jun 6, 9:39 AM MDT | Severe Thunderstorm Warning | GJT | San Juan | 36 min |
| Jun 6, 9:54 AM MDT | Severe Thunderstorm Warning | GJT | San Juan | 36 min |
| Jun 6, 10:09 AM MDT | Severe Thunderstorm Warning | GJT | San Juan | 36 min |
| Jun 6, 10:17 AM MDT | Special Weather Statement | GJT | Grand | 28 min |
| Jun 6, 10:24 AM MDT | Severe Thunderstorm Warning | GJT | Grand | 36 min |
| Jun 6, 10:33 AM MDT | Severe Thunderstorm Warning | GJT | Grand, San Juan | 42 min |
| Jun 6, 11:24 AM MDT | Areal Flood Advisory | GJT | San Juan | 3 hr |
| Jun 6, 11:29 AM MDT | Areal Flood Advisory | GJT | Grand | 2 hr |
| Jun 6, 11:52 AM MDT | Areal Flood Advisory | GJT | Grand | 3 hr |
| Jun 6, 1:00 PM MDT | Severe Thunderstorm Warning | GJT | Grand | 30 min |
| Jun 6, 1:03 PM MDT | Areal Flood Advisory | GJT | Grand | 103 min |
| Jun 6, 1:24 PM MDT | Severe Thunderstorm Warning | GJT | Grand | 51 min |
| Jun 6, 2:04 PM MDT | Special Weather Statement | GJT | Grand | 41 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2020Severe Thunderstorm Warnings in Utah, 2020Every severe thunderstorm warning in 2020
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.