Alert archive / Colorado / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 87, NWS Denver/Boulder, CO

June 16, 2010Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 16, 2010, 4:21 PM MDT for Weld County, Colorado. It was in force for 24 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 16, 2010, 4:21 PM MDT (22:21 UTC)
Expired: Jun 16, 2010, 4:45 PM MDT
In force: 24 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 75 km from the middle of the area, began a volume at 22:21 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 16, 4:01 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.4 hours before the alert went out and 125 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 117 J/kg
Mixed-layer CIN: -302 J/kg
Mixed-layer LCL: 2097 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 16, 2:30 PM MDT, 1 hour 51 minutes earlier.

Area forecast discussion, Jun 16, 2:30 PM MDT, 1 hour 51 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 16, 10:37 AM MDT, 5 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1037 AM MDT WED JUN 16 2010

COZ030>051-171200-
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-
1037 AM MDT WED JUN 16 2010

...HIGH WIND WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO NOON MDT
THURSDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

SOUTHERLY WINDS OF 15 TO 25 MPH WITH GUSTS TO 40 MPH WILL DEVELOP
THIS AFTERNOON ACROSS PARTS OF THE FRONT RANGE AND EASTERN PLAINS.
THERE WILL BE A SLIGHT CHANCE FOR A THUNDERSTORMS OVER FAR NORTHEAST
COLORADO BY LATER THIS AFTERNOON. A SEVERE THUNDERSTORM WITH LARGE
HAIL CAN NOT BE RULED OUT ACROSS LOGAN...PHILLIPS AND SEDGWICK
COUNTIES. WEAKER THUNDERSTORMS WILL BE POSSIBLE OVER NORTH CENTRAL
COLORADO THIS AFTERNOON.

STRONG SOUTHWEST WINDS WILL DEVELOP AFTER MIDNIGHT TONIGHT AND
THURSDAY MORNING IN AND NEAR THE FOOTHILLS. GUSTS TO 80 MPH WILL BE
POSSIBLE AROUND DAY BREAK AS A STORM SYSTEM MOVES INTO WYOMING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

STRONG AND GUSTY WINDS THURSDAY MORNING WILL GRADUALLY DIMINISH BY
THE AFTERNOON.  UNTIL THE WINDS DIMINISH...THE STRONGER GUSTS MAY
BREAK TREE LIMBS AND CAUSE SCATTERED POWER OUTAGES.

OTHERWISE IT WILL BE WARMER AND DRIER THROUGH MOST OF THE PERIOD.
SLIGHTLY COOLER TEMPERATURES AND A BETTER CHANCE OF THUNDERSTORMS
MAY ENTER THE PICTURE BY LATE IN THE WEEKEND INTO EARLY NEXT
WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED ACROSS THE FAR NORTHEAST PLAINS OF
COLORADO AFTER 4 PM. HIGH WIND REPORTS WILL ALSO BE APPRECIATED OVER
THE FRONT RANGE FOOTHILLS AND ADJACENT PLAINS FOR LATER TONIGHT AND
THURSDAY MORNING.

SWE/BARJENBRUCH

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 16, 4:02 AM MDT	High Wind Warning	BOU	Boulder, Broomfield, Clear Creek, Douglas, Gilpin, Jefferson and 3 more	29 hr

Nearby

Severe Thunderstorm Warnings in Colorado, 2010 Every severe thunderstorm warning in 2010

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.