Alert archive / Colorado / Special Weather Statements in 2012

Special Weather Statement, NWS Denver/Boulder, CO

July 25, 2012Logan County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Jul 25, 2012, 5:16 PM MDT for Logan County, Colorado. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 25, 2012, 5:16 PM MDT (23:16 UTC)
Expired
Jul 25, 2012, 6:15 PM MDT
In force
59 min
Issued by
NWS Denver/Boulder, CO

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 131 km from the middle of the area, began a volume at 23:16 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, 11.3 hours before the alert went out and 92 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2012-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2012-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2363 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 25, 3:42 PM MDT, 1 hour 34 minutes earlier.

Area forecast discussion, Jul 25, 3:42 PM MDT, 1 hour 34 minutes before
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Hazardous weather outlook, Jul 25, 10:33 AM MDT, 6 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1033 AM MDT WED JUL 25 2012

COZ030>051-261645-
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-
1033 AM MDT WED JUL 25 2012

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER THE EASTERN
PLAINS OF COLORADO THIS MORNING...BECOMING MORE NUMEROUS THIS
AFTERNOON. EXPECT BRIEF HEAVY RAIN...GUSTY WINDS TO 40 MPH AND
MAYBE SOME SMALL HAIL.

FURTHER WEST...OVER THE URBAN CORRIDOR AND MOUNTAINS AND FOOTHILLS...
THUNDERSTORM COVERAGE WILL BE MORE ISOLATED TODAY WITH WEAKER
STORMS. DRIER AIR IS MOVING IN FROM THE WEST WHICH WILL KEEP THE
THREAT OF HEAVY RAIN MUCH LOWER THAN PREVIOUS DAYS. STORMS WILL BE
MOVING MORE EASTERLY BUT BEGIN TO DIMINISH BY LATE AFTERNOON AND
EARLY THIS EVENING.

TEMPERATURES WILL BE COOLER WITH HIGHS ONLY IN THE UPPER 80S TO LOWER
90S OVER THE PLAINS. THE GOOD NEWS IS NO TRIPLE DIGIT HEAT
EXPECTED.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE WILL BE A SLIGHT CHANCE OF LATE DAY SHOWERS AND THUNDERSTORMS
ACROSS MUCH OF THE FORECAST AREA ON THURSDAY. THERE WILL BE A
BETTER CHANCE OF LATE DAY SHOWERS AND THUNDERSTORMS FRIDAY THROUGH
SUNDAY...ESPECIALLY OVER THE HIGH COUNTRY. IT WILL DRY OUT A BIT
MONDAY AND TUESDAY...SO ONLY A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED. TEMPERATURES WILL HOVER AROUND
SEASONAL NORMALS THROUGH MUCH OF THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

In the hours before

Special weather statement, Jul 25, 3:36 PM MDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
336 PM MDT WED JUL 25 2012

COZ035-038-252215-
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY CO-
LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET CO-
336 PM MDT WED JUL 25 2012

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY FOR

  EAST CENTRAL LARIMER COUNTY

AT 330 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM CAPABLE OF PRODUCING BRIEF HEAVY RAINFALL...UP TO ONE
HALF INCH IN LESS THAN 30 MINUTES...PEA SIZE HAIL...AND WIND GUSTS
TO AROUND 40 MPH.  THIS STORM WAS LOCATED NEAR POUDRE PARK...OR 14
MILES NORTHWEST OF FORT COLLINS...MOVING SOUTHEAST AT 15 MPH.

LOCATIONS IN THE ADVISORY INCLUDE BUT ARE NOT LIMITED TO THE HIGH
PARK BURN AREA...WELLINGTON...TIMNATH...TEDS PLACE...POUDRE
PARK...BUCKHORN MOUNTAIN...BELLVUE AND FORT COLLINS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINS MAY ALSO OCCUR WITH THIS STORM...WHICH MAY FLOOD
LOW-LYING AREAS SUCH AS DITCHES AND UNDERPASSES. MINOR FLOODING IN
THE HIGH PARK BURN AREA MAY ALSO OCCUR SO SLOW DOWN AS SOME DEBRIS
MAY GET WASHED ONTO HIGHWAY 14...THE POUDRE CANYON HIGHWAY.

&&

LAT...LON 4070 10495 4041 10496 4060 10541 4077 10529
TIME...MOT...LOC 2130Z 293DEG 13KT 4068 10529
Special weather statement, Jul 25, 5:16 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 3:36 PM MDTSpecial Weather StatementBOULarimer39 min

Nearby

Special Weather Statements in Colorado, 2012Every special weather statement in 2012

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.