Alert archive / Colorado / Areal Flood Advisories in 2021
Areal Flood Advisory 4, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this areal flood advisory at May 16, 2021, 1:33 PM MDT for Jackson County, Colorado. It was in force for 87 min.
The area
The counties it named.
The facts
- Issued
- May 16, 2021, 1:33 PM MDT (19:33 UTC)
- Expired
- May 16, 2021, 3:00 PM MDT
- In force
- 87 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Jackson County, CO
The radar
The Cheyenne radar (KCYS), 140 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 279 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
- 215 J/kg
- Mixed-layer CIN
- -294 J/kg
- Mixed-layer LCL
- 861 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- -44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory 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 areal flood advisory went out at May 16, 10:54 AM MDT, 2 hours 39 minutes earlier.
Area forecast discussion, May 16, 10:54 AM MDT, 2 hours 39 minutes before
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</html>Hazardous weather outlook, May 16, 10:00 AM MDT, 3 hours 33 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1000 AM MDT Sun May 16 2021 COZ030>051-171600- 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- 1000 AM MDT Sun May 16 2021 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Scattered thunderstorms will develop over the mountains this afternoon, and spread onto the plains in the late afternoon and evening hours. Some of the storms on the plains could be severe, mainly south of Interstate 76 in the early evening. The main threats are hail up to one inch in diameter and heavy rain. Wind gusts to 60 mph are also possible. There is a threat of minor flooding from thunderstorm rains in the foothills burn areas this afternoon, especially in Boulder and Larimer counties. Sustained heavy rain is not expected in the burn areas. .DAYS TWO THROUGH SEVEN...Monday through Saturday Showers and thunderstorms will be likely on Monday and Tuesday. The risk for these storms to produce flooding or severe hail or wind will be low. Showers and storms are possible Wednesday with less areal coverage. A warm and windy pattern will develop Thursday into next weekend. There will be a chance for isolated showers and storms most afternoon and evenings during that period. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today or tonight.
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 6:00 PM MDT | Special Weather Statement | BOU | Douglas | 30 min |
| May 16, 3:58 PM MDT | Special Weather Statement | BOU | Lincoln | 32 min |
| May 16, 4:13 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| May 16, 4:27 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 33 min |
| May 16, 4:43 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| May 16, 4:51 PM MDT | Tornado Warning | BOU | Lincoln | 24 min |
| May 16, 4:54 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 36 min |
| May 16, 5:22 PM MDT | Areal Flood Advisory | BOU | Lincoln | 113 min |
Nearby
Areal Flood Advisories in Colorado, 2021Every areal flood advisory in 2021
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.