Alert archive / Colorado / Winter Storm Watches in 2007
Winter Storm Watch 4, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm watch at Apr 11, 2007, 3:00 PM MDT for 22 counties in Colorado. It took effect at Apr 13, 2007, 12:00 AM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 11, 2007, 3:00 PM MDT (21:00 UTC)
- In effect from
- Apr 13, 2007, 12:00 AM MDT
- Expired
- Apr 12, 2007, 5:38 AM MDT
- In force
- Issued by
- NWS Denver/Boulder, CO
All 22 counties
Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Summit County, CO, Washington County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 21 km from the middle of the area, began a volume at 20:57 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, 9.0 hours before the alert went out and 120 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
- 2088 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 112 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 11, 2:30 PM MDT, 30 minutes earlier.
Area forecast discussion, Apr 11, 2:30 PM MDT, 30 minutes before
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</html>Hazardous weather outlook, Apr 11, 11:10 AM MDT, 3 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1110 AM MDT WED APR 11 2007 COZ030>051-121200- 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- 1110 AM MDT WED APR 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SNOW SHOWERS IN THE MOUNTAINS WILL SLOWLY DIMINISH BY LATER THIS AFTERNOON BUT BEFORE THEN AN ADDITIONAL INCH OR TWO IS POSSIBLE MAINLY IN AREAS CLOSER TO THE DIVIDE. NORTHWEST WINDS OF 15 TO 30 MPH WITH GUSTS TO 40 TO 50 MPH WILL PREVAIL ABOVE TREELINE PRODUCING AREAS OF BLOWING SNOW. GUSTY WINDS WILL ALSO PREVAIL ALONG THE EASTERN SLOPES AND ONTO THE PLAINS THROUGH THIS AFTERNOON. ON THE EASTERN PLAINS NORTHWEST WINDS OF 15 TO 25 MPH WITH GUSTS OF 35 MPH WILL BE COMMON...ESPECIALLY EAST OF A LINE FROM GREELEY TO LIMON. A FEW LIGHT RAIN OR SNOW SHOWERS ARE ALSO POSSIBLE OVER THE FAR NORTHEAST PLAIN. CONDITIONS SHOULD QUIET DOWN OVERNIGHT EXCEPT FOR AN INCREASE IN CLOUDINESS IN THE MOUNTAINS WITH SOME LIGHT SNOW DEVELOPING TOWARDS DAYBREAK. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SNOWFALL WILL INCREASE IN THE HIGH COUNTRY THURSDAY AFTERNOON BEFORE SPREADING INTO THE PLAINS AND FRONT RANGE THURSDAY EVENING. SNOW MAY BE HEAVY AT TIME EARLY FRIDAY MORNING...PARTICULARLY FOR THE FOOTHILLS AND ADJACENT AREAS OF THE FOOTHILLS SOUTH OF I-70. THESE AREAS MAY SEE SEVERAL INCHES OF SNOW ACCUMULATION BEFORE SNOWFALL ENDS FRIDAY NIGHT. COLD TEMPERATURES AND GUSTY WINDS ARE EXPECTED WITH THE STORM. A BRIEF WARMUP IS EXPECTED FOR THE WEEKEND BEFORE ANOTHER PACIFIC STORM SYSTEM MOVES INTO THE AREA FOR THE FIRST PART OF NEXT WEEK. THIS STORM WILL LIKELY BRING RAIN AND SNOW TO THE DISTRICT MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.
Nearby
Winter Storm Watches in Colorado, 2007Every winter storm watch in 2007
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.