Alert archive / Colorado / Special Weather Statements in 2018

Special Weather Statement, NWS Denver/Boulder, CO

June 22, 2018Adams County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Jun 22, 2018, 4:39 PM MDT for Adams County, Colorado. It was in force for 36 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
Jun 22, 2018, 4:39 PM MDT (22:39 UTC)
Expired
Jun 22, 2018, 5:15 PM MDT
In force
36 min
Issued by
NWS Denver/Boulder, CO

County Adams County, CO

The radar

The Denver radar (KFTG), 46 km from the middle of the area, began a volume at 22:40 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 12:00Z, 10.7 hours before the alert went out and 70 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 2018-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 709 joules per kilogram.LCLLFCEL10008507005003002001001 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 2018-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.19395878Sfc1 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
709 J/kg
Mixed-layer CIN
-235 J/kg
Mixed-layer LCL
1144 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

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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 Jun 22, 3:34 PM MDT, 1 hour 5 minutes earlier.

Area forecast discussion, Jun 22, 3:34 PM MDT, 1 hour 5 minutes before
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Hazardous weather outlook, Jun 22, 11:18 AM MDT, 5 hours 21 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1118 AM MDT Fri Jun 22 2018

COZ030>051-231730-
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-
1118 AM MDT Fri Jun 22 2018

...SEVERE STORMS POSSIBLE OVER PORTIONS OF NORTHEAST COLORADO THIS
AFTERNOON...

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

A few severe thunderstorms can be expected across northeast
Colorado this afternoon. The main threat will be on the plains
east of a line from Greeley to Kiowa. The highest threat from
storms today will be large hail and wind gusts to 70 mph. Farther
west including the I-25 corridor, we should see a few early to
mid afternoon storms, but the threat of any severe weather will be
lower.

By early evening, most of the storms should have pushed east of
the state. A couple showers and storms may linger over the
northeast plains, but the threat of severe weather will have
diminished considerably as the airmass stabilizes.

In the mountains and foothills, after a few morning showers look
for drier air and breezy conditions to move in. This will elevate
the fire danger, with critical Red Flag conditions over South
Park.

A fast moving upper level weather disturbance will bring the
potential for severe thunderstorms on the plains and high fire
danger in the mountains.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Isolated late day showers and thunderstorms are expected on
Saturday. An upper level storm will bring more moisture, a good
chance of showers and thunderstorms and cooler temperatures
Saturday night and Sunday. A little warmer on Monday with a chance
of afternoon and evening thunderstorms in the mountains and far
eastern plains. Tuesday through Thursday will be warmer and drier
with only a slight chance of late day showers and thunderstorms.

.SPOTTER INFORMATION STATEMENT...

Spotters have been activated.

Gimmestad/Cooper

In the hours before

Local storm report, Jun 22, 12:58 PM MDT, 3 hours 41 minutes before
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Special weather statement, Jun 22, 1:37 PM MDT, 3 hours 2 minutes before
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Local storm report, Jun 22, 1:39 PM MDT, 3 hours before
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Special weather statement, Jun 22, 3:34 PM MDT, 1 hour 5 minutes before
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Special weather statement, Jun 22, 4:17 PM MDT, 22 minutes before
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Special weather statement, Jun 22, 4:39 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
Jun 21, 7:13 PM MDTSpecial Weather StatementBOUWeld62 min
Jun 21, 7:27 PM MDTSpecial Weather StatementBOUCrowley33 min
Jun 22, 2:37 AM MDTRed Flag WarningBOUPark17 hr
Jun 22, 10:51 AM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe39 min
Jun 22, 11:27 AM MDTSpecial Weather StatementBOUDenver48 min
Jun 22, 11:53 AM MDTSevere Thunderstorm WarningBOUWashington30 min
Jun 22, 12:27 PM MDTSpecial Weather StatementBOUWashington48 min
Jun 22, 1:37 PM MDTSpecial Weather StatementBOULincoln53 min
Jun 22, 3:34 PM MDTSpecial Weather StatementBOUDenver41 min
Jun 22, 4:17 PM MDTSpecial Weather StatementBOUAdams, Arapahoe, Denver58 min
Jun 22, 4:45 PM MDTSpecial Weather StatementBOULogan45 min

Nearby

Special Weather Statements in Colorado, 2018Every special weather statement in 2018

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.