Alert archive / Colorado / River Flood Warnings in 2010

River Flood Warning 1, NWS Denver/Boulder, CO

April 23, 2010Adams County, Colorado

NWS Denver/Boulder, CO issued this river flood warning at Apr 23, 2010, 4:34 PM MDT for Adams County, Colorado. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Apr 23, 2010, 4:34 PM MDT (22:34 UTC)
Expired: Apr 23, 2010, 7:55 PM MDT
In force: 3 hr
Issued by: NWS Denver/Boulder, CO
Flood severity: Minor

County Adams County, CO

The radar

The Denver radar (KFTG), 20 km from the middle of the area, began a volume at 22:35 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 river

Written for the forecast point South Platte River at Henderson (HNDC2).

Action stage: 10 ft
Minor stage: 11 ft
Moderate stage: 13 ft
Major stage: 15 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood 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 river flood warning went out at Apr 23, 3:50 PM MDT, 44 minutes earlier.

Area forecast discussion, Apr 23, 3:50 PM MDT, 44 minutes before

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Hazardous weather outlook, Apr 23, 11:20 AM MDT, 5 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1120 AM MDT FRI APR 23 2010

COZ030>051-241200-
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-
1120 AM MDT FRI APR 23 2010

...WINTER STORM WARNINGS FOR MOUNTAINS...FOOTHILLS AND PALMER DIVIDE
   THROUGH 9AM MDT SUNDAY...
...WINTER WEATHER ADVISORY FOR SNOW FOR NORTH PARK...MIDDLE PARK AND
   SOUTH PARK THROUGH 9AM SUNDAY...

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

.DAY ONE...TODAY AND TONIGHT

A STRONG STORM SYSTEM CENTERED OVER SOUTHEASTERN COLORADO WILL
AFFECT THE REGION THROUGH TONIGHT. THE SNOW LEVEL WILL HOVER AROUND
6500 FEET TODAY...LOWERING TO AROUND 5500 FEET TONIGHT. PERIODS OF
HEAVY SNOW CAN BE EXPECTED OVER THE HIGHER ELEVATIONS...ESPECIALLY
ALONG THE EAST SLOPES OF THE FRONT RANGE AND THE PALMER DIVIDE. SNOW
ACCUMULATIONS BY SATURDAY MORNING ACROSS THE MOUNTAINS AND ALONG THE
FOOTHILLS WILL RANGE FROM 14 TO 28 INCHES...WITH THE HEAVIEST
AMOUNTS ON THE EAST SLOPES OF THE FRONT RANGE. ALONG THE PALMER
DIVIDE...SNOW ACCUMULATIONS OF 6 TO 16 INCHES CAN BE EXPECTED. SOME
SNOW IS POSSIBLE IN THE DENVER AREA TONIGHT...BUT ANY ACCUMULATION
WILL BE ON GRASSY AREAS NEAR THE FOOTHILLS AND SOUTHERN SUBURBS.

ACROSS THE PLAINS...RAIN WILL CONTINUE THROUGH TONIGHT WITH
ADDITIONAL AMOUNTS OF UP TO INCH. THUNDERSTORMS ARE AGAIN EXPECTED
THROUGH THIS EVENING EAST OF A FORT MORGAN TO LIMON LINE. SMALL HAIL
AND WIND GUSTS TO 50 MPH ALONG WITH HEAVY RAIN WILL BE THE MAIN
THREATS. A FEW STORMS COULD BECOME SEVERE WITH LARGE HAIL...STRONG
WINDS. ISOLATED TORNADOES ARE ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

PRECIPITATION SHOULD COME TO AN END ON THE PLAINS DURING THE DAY
SATURDAY AND IN THE MOUNTAINS BY SATURDAY EVENING AS GUSTY NORTHWEST
WINDS USHER IN DRIER AIR FROM WYOMING AS THE LATEST STORM SYSTEM
EXITS THE AREA. CLEARING SKIES SATURDAY NIGHT MAY RESULT IN AREAS OF
FROST...ESPECIALLY IN LOW LYING AREAS. PEOPLE MAY WANT TO TAKE
PRECAUTIONS TO PROTECT TENDER OUTDOOR PLANTS AND GARDENS SHOULD
FROST DEVELOP. OTHERWISE...THERE WILL BE A SLIGHT CHANCE OF RAIN
SHOWERS AND THUNDERSTORMS ON THE PLAINS AND A CHANCE OF RAIN AND
SNOW SUNDAY AFTERNOON THROUGH MONDAY. DRIER AND WARMER CONDITIONS
RETURN TO THE AREA ON WEDNESDAY UNDER A RIDGE OF HIGH PRESSURE. THEN
LOOK FOR COOLER TEMPERATURES AND ANOTHER CHANCE OF SHOWERS AND
AFTERNOON THUNDERSTORMS ON THURSDAY AS ANOTHER STORM SYSTEM MOVES
OUT OF THE GREAT BASIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED FOR THE PORTIONS OF THE EASTERN
PLAINS. ELSEWHERE...FORMAL SPOTTER ACTIVATION IS NOT ANTICIPATED
TODAY...BUT REPORTS OF HEAVY SNOW OR STRONG THUNDERSTORMS WILL BE
APPRECIATED.

D-L/BAKER

In the hours before

Local storm report, Apr 23, 2:07 PM MDT, 2 hours 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
207 PM MDT FRI APR 23 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0146 PM     HEAVY SNOW       2 ENE CASTLE ROCK       39.39N 104.82W
04/23/2010  M9.0 INCH        DOUGLAS            CO   TRAINED SPOTTER

&&

BLOUIS

Local storm report, Apr 23, 2:29 PM MDT, 2 hours 5 minutes before

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Local storm report, Apr 23, 3:29 PM MDT, 1 hour 5 minutes before

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Local storm report, Apr 23, 3:31 PM MDT, 1 hour 3 minutes before

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Local storm report, Apr 23, 3:57 PM MDT, 37 minutes before

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Local storm report, Apr 23, 4:07 PM MDT, 27 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 8:28 PM MDT	Special Weather Statement	BOU	Elbert	32 min
Apr 23, 11:16 AM MDT	Tornado Warning	BOU	Lincoln	20 min
Apr 23, 1:52 PM MDT	Tornado Warning	BOU	Morgan	23 min
Apr 23, 2:15 PM MDT	Tornado Warning	BOU	Morgan	38 min

Nearby

River Flood Warnings in Colorado, 2010 Every river flood 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.