Alert archive / Colorado / Winter Storm Watches in 2011
Winter Storm Watch 6, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm watch at Apr 2, 2011, 3:33 AM MDT for Grand County, Jackson County, Colorado. It took effect at Apr 3, 2011, 3:00 AM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 2, 2011, 3:33 AM MDT (09:33 UTC)
- In effect from
- Apr 3, 2011, 3:00 AM MDT
- Expired
- Apr 2, 2011, 4:51 PM MDT
- In force
- Issued by
- NWS Denver/Boulder, CO
Counties Grand County, CO, Jackson County, CO
The radar
The Cheyenne radar (KCYS), 147 km from the middle of the area, began a volume at 09:33 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 00:00Z, 9.6 hours before the alert went out and 261 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
- 3261 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 234 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm watch went out at Apr 2, 2:43 AM MDT, 50 minutes earlier.
Area forecast discussion, Apr 2, 2:43 AM MDT, 50 minutes before
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</html>Hazardous weather outlook, Apr 1, 11:07 AM MDT, 16 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1107 AM MDT FRI APR 01 2011 COZ030>051-021200- 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- 1107 AM MDT FRI APR 01 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT DRY CONDITIONS ARE EXPECTED ACROSS ALL THE FORECAST TODAY AND TONIGHT WITH TEMPERATURES ABOVE SEASONAL NORMALS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY GUSTY SOUTHWEST WINDS AND NEAR RECORD TEMPERATURES WILL LIKELY BRING CRITICAL FIRE WEATHER CONDITIONS SATURDAY AFTERNOON...POSSIBLY PERSISTING IN AND NEAR THE FOOTHILLS...PARK COUNTY...AND THE PALMER DIVIDE AREA INTO EARLY SUNDAY. A STRONG COLD FRONT WILL BRING COLDER AIR AND MOISTURE ON SUNDAY AFTERNOON. IN THE MOUNTAINS...THE SHOWERS MAY BEGIN AS EARLY AS SATURDAY NIGHT...AND THEN SNOW WILL BECOME MORE WIDESPREAD AND HEAVIER ON SUNDAY. ON THE PLAINS...A FEW RAIN SHOWERS ARE EXPECTED TO DEVELOP SUNDAY AFTERNOON. TEMPERATURES WILL THEN TURN MUCH COLDER LATE SUNDAY...BRINGING POTENTIAL FOR ACCUMULATING SNOWFALL AT LOWER ELEVATIONS SUNDAY EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. RJK/GIMMESTAD
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 4:51 PM MDT | Winter Storm Warning | BOU | Grand, Jackson | 28 hr |
| Apr 2, 4:51 PM MDT | Winter Weather Advisory | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 28 hr |
Nearby
Winter Storm Watches in Colorado, 2011Every winter storm watch in 2011
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.