Alert archive / Colorado / River Flood Warnings in 2015

River Flood Warning 12, NWS Denver/Boulder, CO

May 23, 2015Logan County, Morgan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this river flood warning at May 23, 2015, 6:27 PM MDT for Logan County, Morgan County, Washington County, Colorado. It took effect at May 24, 2015, 9:00 AM MDT. It was in force for 57 hr.

The area

The counties it named.

The facts

Issued
May 23, 2015, 6:27 PM MDT (00:27 UTC)
In effect from
May 24, 2015, 9:00 AM MDT
Expired
May 26, 2015, 6:00 PM MDT
In force
57 hr
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Flood severity
Minor

Counties Logan County, CO, Morgan County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 116 km from the middle of the area, began a volume at 00:29 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 near Balzac (BZNC2).

Action stage
8 ft
Minor stage
10 ft
Moderate stage
11 ft
Major stage
12.5 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 May 23, 3:21 PM MDT, 3 hours 6 minutes earlier.

Area forecast discussion, May 23, 3:21 PM MDT, 3 hours 6 minutes before
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Hazardous weather outlook, May 23, 11:11 AM MDT, 7 hours 16 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1111 AM MDT SAT MAY 23 2015

COZ030>051-241715-
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-
1111 AM MDT SAT MAY 23 2015

...STRONG THUNDERSTORMS EXPECTED TO MOVE OVER NORTHEAST COLORADO
THIS AFTERNOON...

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

.DAY ONE...TODAY AND TONIGHT

AN UPPER LEVEL STORM SYSTEM OVER EASTERN UTAH TODAY WILL MOVE
SLOWLY INTO WESTERN COLORADO BY TONIGHT. THIS SYSTEM WILL COMBINE
WITH ABUNDANT MOISTURE ACROSS EASTERN COLORADO TO PRODUCE ANOTHER
ROUND OF SHOWERS AND THUNDERSTORMS ACROSS MUCH OF THE AREA THIS
AFTERNOON AND EARLY EVENING.

A FEW SEVERE STORMS WILL BE POSSIBLE OVER THE PLAINS OF NORTHEAST
COLORADO THROUGH THE AFTERNOON WITH LARGE HAIL AND A FEW
TORNADOES. IN ADDITION...THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING HEAVY RAINFALL WITH 1 TO 2 INCHES OF RAIN IN 30 MINUTES
OR LESS. WHEN THE HEAVY RAINS DEVELOP...FLASH FLOODING WILL
QUICKLY RESULT DUE TO THE SATURATED SOIL CONDITIONS. PEOPLE
SHOULD REMAIN ALERT FOR RAPIDLY CHANGING CONDITIONS THROUGH THE
AFTERNOON. THUNDERSTORMS WILL GENERALLY BE MOVING FROM SOUTH TO
NORTH...AND MULTIPLE WAVES OF STORMS WILL BE POSSIBLE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SUBTLE DAY TO DAY TEMPERATURE AND PRECIPITATION CHANCES ARE IN
STORE FOR THE FORECAST AREA DURING THE UPCOMING WEEK. SUNDAY AND
WEDNESDAY WILL HAVE THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS
WITH PASSING WEATHER SYSTEMS. MONDAY AND TUESDAY WILL BE DRIER AND
WARMER WITH A PASSING HIGH PRESSURE RIDGE. ALTHOUGH DAYTIME
HEATING AND RESIDUAL MOISTURE ARE LIKELY TO PRODUCE SCATTERED
AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS BOTH DAYS...
MAINLY OVER AND NEAR THE MOUNTAINS. BY LATE IN THE WEEK...WETTER
AND COOLER CONDITIONS COULD RETURN WITH UPSLOPE FLOW AND A PASSING
PACIFIC STORM SYSTEM. TEMPERATURES THROUGH THE PERIOD WILL RANGE
FROM NEAR TO SLIGHTLY BELOW AVERAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED OVER NORTHEAST COLORADO THROUGH
THE AFTERNOON.

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 8:18 PM MDTAreal Flood AdvisoryBOULogan3 hr
May 23, 10:20 PM MDTFlash Flood WarningBOULogan5 hr
May 24, 2:10 AM MDTAreal Flood WarningBOULogan18 hr
May 24, 4:44 AM MDTFlash Flood WatchBOUAdams, Arapahoe, Elbert, Lincoln, Logan, Morgan and 4 more14 hr
May 24, 11:22 AM MDTAreal Flood AdvisoryBOUElbert3 hr
May 24, 11:57 AM MDTFlash Flood WarningBOUArapahoe, Elbert3 hr
May 24, 12:08 PM MDTSpecial Weather StatementBOUArapahoe37 min
May 24, 12:15 PM MDTTornado WarningBOUArapahoe, Elbert15 min
May 24, 12:33 PM MDTTornado WarningBOUArapahoe, Elbert27 min
May 24, 1:00 PM MDTTornado WarningBOUArapahoe18 min
May 24, 1:23 PM MDTAreal Flood AdvisoryBOUAdams, Arapahoe3 hr
May 24, 1:25 PM MDTSpecial Weather StatementBOUAdams35 min
May 24, 2:17 PM MDTSpecial Weather StatementBOUWashington28 min
May 24, 2:43 PM MDTAreal Flood AdvisoryBOUAdams, Morgan, Washington3 hr
May 24, 3:15 PM MDTSpecial Weather StatementBOUWashington30 min

Nearby

River Flood Warnings in Colorado, 2015Every river flood warning in 2015

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.