Alert archive / Colorado / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 93, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 20, 2019, 2:47 PM MDT for Adams County, Arapahoe County, Denver County, Colorado. It was in force for 43 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 20, 2019, 2:47 PM MDT (20:47 UTC)
- Expired
- Jun 20, 2019, 3:30 PM MDT
- In force
- 43 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO
The radar
The Denver radar (KFTG), 4 km from the middle of the area, began a volume at 20:46 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
Denver, CO (KDNR), launched 12:00Z, 8.8 hours before the alert went out and 111 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2431 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 260 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 Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 10:57 AM MDT, 3 hours 50 minutes earlier.
Area forecast discussion, Jun 20, 10:57 AM MDT, 3 hours 50 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 20, 10:44 AM MDT, 4 hours 3 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1044 AM MDT Thu Jun 20 2019 COZ030>051-211645- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1044 AM MDT Thu Jun 20 2019 ...STRONG STORMS POSSIBLE FOR THE EASTERN PLAINS TODAY AND TOMORROW... This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Windy conditions are expected in the mountains and foothills with gusts to 50 mph today. Scattered showers and thunderstorms can be expected this afternoon and evening, with a few strong to potentially severe thunderstorms over the east plains. Best chance will be along and east of a line from the Colorado-Wyoming- Nebraska border down to Hugo, south of Limon. Storms in this area will be able to produce large hail up to 1.5 inches in diameter and damaging outflow winds to 60 mph. Elsewhere, west of the aforementioned area, storms will be capable of producing gusty winds to 50 mph. Storm activity is expected to last into the late night hours as a jet is nearby and a cold front will be approaching from the north. .DAYS TWO THROUGH SEVEN...Friday through Wednesday A cold front will move over northeast Colorado Friday morning, ushering in a cooler and unsettled weekend. The surface cold front will combine with southwesterly flow aloft to make it possible for some strong to possibly severe thunderstorms to develop on the plains Friday afternoon. The area will be further south, mainly south of Interstate 76 down toward the Palmer Divide. Large hail and damaging winds would be the primary threats from the strong thunderstorms. The weekend will be even cooler than Friday, with rain showers and thunderstorms possible through the period. An upper level low will be moving over the northern half of the state late Friday with temperatures possibly getting cold enough for snow to fall over the north central mountains, including Rocky Mountain National Park late Friday night and Saturday night. Drier and warmer conditions are expected to return Monday through Wednesday as the upper low moves out and an upper ridge begins building over the southern Great Plains. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight.
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 9:14 PM MDT | Special Weather Statement | BOU | Boulder | 31 min |
| Jun 20, 3:16 PM MDT | Special Weather Statement | BOU | Arapahoe | 29 min |
| Jun 20, 3:30 PM MDT | Special Weather Statement | BOU | Adams | 30 min |
| Jun 20, 3:59 PM MDT | Special Weather Statement | BOU | Adams | 31 min |
| Jun 20, 4:36 PM MDT | Special Weather Statement | BOU | Larimer | 24 min |
| Jun 20, 4:56 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Washington | 49 min |
| Jun 20, 5:01 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 44 min |
| Jun 20, 5:13 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert, Lincoln, Washington | 32 min |
| Jun 20, 5:36 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 39 min |
| Jun 20, 5:44 PM MDT | Special Weather Statement | BOU | Washington | 46 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2019Every severe thunderstorm warning in 2019
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.