Alert archive / Colorado / Special Weather Statements in 2023

Special Weather Statement, NWS Denver/Boulder, CO

August 3, 2023Phillips County, Sedgwick County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Aug 3, 2023, 8:51 PM MDT for Phillips County, Sedgwick County, Colorado. It was in force for 54 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
Aug 3, 2023, 8:51 PM MDT (02:51 UTC)
Expired
Aug 3, 2023, 9:45 PM MDT
In force
54 min
Issued by
NWS Denver/Boulder, CO
Hail
0.75 in
Wind
55

Counties Phillips County, CO, Sedgwick County, CO

The radar

The Goodland radar (KGLD), 161 km from the middle of the area, began a volume at 02:51 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.9 hours before the alert went out and 168 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, N. Platte/Lee Bi, NE at 00:00Z on 2023-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1148 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, N. Platte/Lee Bi, NE at 00:00Z on 2023-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 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
1148 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1232 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
43 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 Aug 3, 8:20 PM MDT, 31 minutes earlier.

Area forecast discussion, Aug 3, 8:20 PM MDT, 31 minutes before
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Hazardous weather outlook, Aug 3, 10:53 AM MDT, 9 hours 58 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1053 AM MDT Thu Aug 3 2023

COZ030>051-041700-
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-
1053 AM MDT Thu Aug 3 2023

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

.DAY ONE...Today and Tonight

Severe thunderstorms are expected to develop across the northeast
plains this afternoon. Scattered storms will first develop over
the mountains and near the I-25 Corridor early this afternoon, and
then become more widespread and intensify as they move east over
the plains. Storms that develop initially along the I-25 Corridor
will be capable of producing large hail and isolated damaging wind
gusts. However, the threat of large hail and especially more
widespread damaging winds will increase as the storms organize and
roll east across the plains late this afternoon and early evening.
Wind gusts of 60-80 mph will be possible, along with golfball
sized hail from the strongest storms. A brief tornado is possible.
Storms will also produce very heavy rain, so there is potential
for localized flash flooding in areas that see multiple storms or
storm mergers.

The thunderstorms will end from west to east fairly quickly
through the late afternoon and early evening hours.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Friday and Saturday will have decreased storm coverage. However, a
couple stronger or severe storms will still be possible over the
northeast plains. There is just a low threat of flash flooding
mainly over the burn areas, as storms will generally be weaker in
the high country and moving along at a fast pace.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight. However,
any reports of heavy rainfall, hail, and strong winds will be
appreciated.

In the hours before

Local storm report, Aug 3, 7:14 PM MDT, 1 hour 37 minutes before
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Special weather statement, Aug 3, 7:16 PM MDT, 1 hour 35 minutes before
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Local storm report, Aug 3, 7:27 PM MDT, 1 hour 24 minutes before
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Special weather statement, Aug 3, 8:14 PM MDT, 37 minutes before
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Local storm report, Aug 3, 8:37 PM MDT, 14 minutes before
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Special weather statement, Aug 3, 8:51 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
Aug 3, 6:08 PM MDTSevere Thunderstorm WarningBOULogan, Weld52 min
Aug 3, 6:22 PM MDTSpecial Weather StatementBOUWashington53 min
Aug 3, 6:27 PM MDTSevere Thunderstorm WarningBOULincoln63 min
Aug 3, 6:30 PM MDTSevere Thunderstorm WarningBOUWeld45 min
Aug 3, 6:55 PM MDTSevere Thunderstorm WarningBOULogan50 min
Aug 3, 7:00 PM MDTSevere Thunderstorm WarningBOUWeld15 min
Aug 3, 7:04 PM MDTSpecial Weather StatementBOULincoln41 min
Aug 3, 7:16 PM MDTSpecial Weather StatementBOULincoln44 min
Aug 3, 7:39 PM MDTSevere Thunderstorm WarningBOULogan51 min
Aug 3, 7:50 PM MDTSevere Thunderstorm WarningBOULogan25 min
Aug 3, 8:14 PM MDTSpecial Weather StatementBOULogan, Sedgwick46 min
Aug 3, 9:19 PM MDTSevere Thunderstorm WarningBOUPhillips41 min
Aug 4, 2:36 PM MDTSpecial Weather StatementBOUElbert39 min
Aug 4, 3:47 PM MDTSpecial Weather StatementBOUMorgan43 min
Aug 4, 4:28 PM MDTSpecial Weather StatementBOULincoln47 min
Aug 4, 4:44 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln31 min
Aug 4, 4:46 PM MDTSpecial Weather StatementBOUSedgwick44 min
Aug 4, 4:53 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick37 min
Aug 4, 5:12 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln48 min
Aug 4, 5:24 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick36 min
Aug 4, 5:50 PM MDTSpecial Weather StatementBOULincoln40 min

Nearby

Special Weather Statements in Colorado, 2023Every special weather statement in 2023

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.