Alert archive / Colorado / Flash Flood Watches in 2015
Flash Flood Watch 1, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood watch at May 5, 2015, 4:21 AM MDT for 10 counties in Colorado. It took effect at May 5, 2015, 12:00 PM MDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 5, 2015, 4:21 AM MDT (10:21 UTC)
- In effect from
- May 5, 2015, 12:00 PM MDT
- Expired
- May 5, 2015, 5:31 PM MDT
- In force
- 6 hr
- Issued by
- NWS Denver/Boulder, CO
- Flood severity
- None
Counties Arapahoe County, CO, Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Park County, CO
The radar
The Denver radar (KFTG), 42 km from the middle of the area, began a volume at 10:28 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 (KDEN), launched 00:00Z, 10.4 hours before the alert went out and 153 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
- 76 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 960 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 189 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at May 5, 2:59 AM MDT, 1 hour 22 minutes earlier.
Area forecast discussion, May 5, 2:59 AM MDT, 1 hour 22 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, May 4, 10:02 AM MDT, 18 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1002 AM MDT MON MAY 4 2015 COZ030>051-051615- 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- 1002 AM MDT MON MAY 4 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT COOL AND MOIST UPSLOPE FLOW IS IN PLACE TODAY...AND SOME SHOWERS CONTINUE THIS MORNING TO DRIFT NORTH WITH SOUTHERLY FLOW ALOFT. WE EXPECT THUNDERSTORMS TO ERUPT ACROSS THE MOUNTAINS AROUND MIDDAY...THEN SPREAD ACROSS THE PALMER DIVIDE...URBAN CORRIDOR AND FOOTHILLS THIS AFTERNOON. NEAR RECORD PRECIPITABLE WATER VALUES WILL ALLOW FOR LOCALLY HEAVY RAINFALL FROM THE SHOWERS AND STORMS...ESPECIALLY LATE AFTERNOON INTO THE EVENING. SNOW LEVELS WILL BE AROUND 10 THOUSAND FEET WITH A FEW INCHES OF WET SNOW POSSIBLE THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY WIDESPREAD SHOWERS AND A FEW THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL WILL REMAIN IN THE FORECAST ON TUESDAY. AT THIS TIME...THE MAIN THREAT FOR LOCALLY HEAVY RAINFALL WILL OCCUR FROM THE FOOTHILLS AND I-25 CORRIDOR EASTWARD ACROSS THE PLAINS LATE TUESDAY MORNING THROUGH THE AFTERNOON HOURS. THE HEAVY RAIN THREAT WILL DECREASE TUESDAY EVENING AS AN UPPER LEVEL DISTURBANCE MOVES NORTHEAST OF THE STATE. AT THIS TIME...IT APPEARS THAT MAINLY BURN SCARS WOULD BE MORE SUSCEPTIBLE TO ANY POTENTIAL FLOODING ISSUES. WHILE THE OVERALL THREAT OF SEVERE WEATHER WILL BE LIMITED BY MARGINAL INSTABILITY IN THE ATMOSPHERE...A BRIEF TORNADO WOULD BE POSSIBLE TUESDAY AS WIND SHEAR INCREASES. IN THE HIGHER MOUNTAINS...THE SNOW LEVEL IS EXPECTED TO LOWER INTO THE 9500-10500 FOOT RANGE TUESDAY NIGHT INTO WEDNESDAY MORNING. THE MORE SIGNIFICANT SNOW TOTALS SHOULD STILL BE LIMITED TO THE HIGHER MOUNTAIN PEAKS ABOVE 11 THOUSAND TO 12 THOUSAND FEET...WHERE SEVERAL INCHES TO OVER A FOOT OF SNOW WILL BE POSSIBLE THROUGH WEDNESDAY. UNSETTLED WEATHER WILL REMAIN IN THE FORECAST THROUGH NEXT WEEKEND WITH A CHANCE OF SHOWERS AND STORMS NEARLY EACH AND EVERY DAY. .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 |
|---|---|---|---|---|
| May 4, 6:59 PM MDT | Flash Flood Warning | BOU | Elbert | 6 hr |
| May 4, 7:09 PM MDT | Areal Flood Advisory | BOU | Adams, Denver | 111 min |
| May 4, 10:34 PM MDT | Areal Flood Advisory | BOU | Boulder | 3 hr |
| May 5, 1:02 AM MDT | Areal Flood Warning | BOU | Elbert | 4 hr |
| May 5, 8:28 AM MDT | Dense Fog Advisory | BOU | Boulder, Elbert, Larimer, Lincoln, Logan, Morgan and 4 more | 4 hr |
Nearby
Flash Flood Watches in Colorado, 2015Every flash flood watch in 2015
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.