Alert archive / Colorado / Special Weather Statements in 2014

Special Weather Statement, NWS Denver/Boulder, CO

May 20, 2014Logan County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at May 20, 2014, 4:33 AM MDT for Logan County, Colorado. It was in force for 42 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
May 20, 2014, 4:33 AM MDT (10:33 UTC)
Expired
May 20, 2014, 5:15 AM MDT
In force
42 min
Issued by
NWS Denver/Boulder, CO

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 128 km from the middle of the area, began a volume at 10:31 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 (KDEN), launched 00:00Z, 10.6 hours before the alert went out and 121 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 00:00Z on 2014-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 268 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 00:00Z on 2014-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939587897Sfc1 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
268 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
3141 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 May 20, 3:43 AM MDT, 50 minutes earlier.

Area forecast discussion, May 20, 3:43 AM MDT, 50 minutes before
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Hazardous weather outlook, May 19, 10:40 AM MDT, 17 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1040 AM MDT MON MAY 19 2014

COZ030>051-201645-
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-
1040 AM MDT MON MAY 19 2014

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

.DAY ONE...TODAY AND TONIGHT

SUNNY AND WARM WEATHER WILL PREVAIL TODAY. HIGH TEMPERATURES ON
THE PLAINS ARE EXPECTED TO PEAK AROUND THE 80 DEGREE MARK. THERE
IS JUST A SLIGHT RISK OF A LATE AFTERNOON OR EVENING THUNDERSTORM
NEAR THE WYOMING AND NEBRASKA BORDER. IF AN ISOLATED STORM
DEVELOPS...IT COULD PRODUCE BRIEF HEAVY RAIN...GUSTY WINDS...AND
SMALL HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ON TUESDAY IT WILL BE COOLER WITH A SLIGHT CHANCE OF LATE
AFTERNOON AND EVENING THUNDERSTORMS FROM THE FOOTHILLS ACROSS THE
PLAINS. A FEW SEVERE STORMS WILL BE POSSIBLE OVER NORTHEAST
COLORADO.

FOR WEDNESDAY MOISTURE WILL INCREASE OVER THE AREA AS A STORM
SYSTEM RESIDES OVER THE GREAT BASIN. THIS WILL LEAD TO A BETTER
CHANCE OF THUNDERSTORMS FROM EAST OF THE DIVIDE ACROSS THE
NORTHEAST PLAINS. SOME OF THE STORMS COULD BE SEVERE OVER
NORTHEAST COLORADO WEDNESDAY AFTERNOON INTO WEDNESDAY EVENING.

FROM THURSDAY INTO FRIDAY THE STORM SYSTEM WILL MOVE INTO THE
SOUTHWESTERN UNITED STATES WITH WEAKENING FLOW ALOFT. HOWEVER
ABUNDANT MOISTURE COMBINED WITH WEAK DISTURBANCES MOVING NORTH ACROSS
THE AREA MAY ALLOW FOR AN INCREASING THREAT OF SLOW MOVING
THUNDERSTORMS AND HEAVY RAINFALL FROM EAST OF THE DIVIDE ACROSS
THE NORTHEAST PLAINS. IF HEAVY RAIN OCCURS OVER THE HIGHER TERRAIN
IN ADDITION TO THE MELTING SNOW THIS COULD INCREASE THE RISK FOR
FLOODING OF RIVERS AND STREAMS.

FOR THE WEEKEND THE STORM SYSTEM OVER THE SOUTHWESTERN US WILL
MOVE SLOWLY EAST NORTHEAST INTO THE SOUTHERN ROCKIES. THUS THERE
STILL COULD BE A CHANCE OF SHOWERS AND THUNDERSTORMS BOTH DAYS
WITH SEASONAL TEMPERATURES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

In the hours before

Special weather statement, May 20, 3:48 AM MDT, 45 minutes before
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Special weather statement, May 20, 4:33 AM 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
May 19, 8:28 PM MDTSevere Thunderstorm WarningBOUSedgwick32 min
May 20, 2:33 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Jefferson42 min
May 20, 3:15 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver, Jefferson45 min
May 20, 4:00 PM MDTTornado WarningBOUArapahoe30 min
May 20, 4:56 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe49 min
May 20, 5:36 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Elbert, Lincoln, Washington39 min

Nearby

Special Weather Statements in Colorado, 2014Every special weather statement in 2014

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.