Alert archive / Colorado / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

May 26, 2019Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 26, 2019, 12:33 AM MDT for Weld County, Colorado. It was in force for 31 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 26, 2019, 12:33 AM MDT (06:33 UTC)
Expired: May 26, 2019, 1:04 AM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 44 km from the middle of the area, began a volume at 06:36 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, 6.6 hours before the alert went out and 152 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 327 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 2886 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

143 
WUUS55 KBOU 260633
SVRBOU
COC123-260715-
/O.NEW.KBOU.SV.W.0021.190526T0633Z-190526T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
1233 AM MDT Sun May 26 2019

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Northwestern Weld County in northeastern Colorado...

* Until 115 AM MDT.

* At 1232 AM MDT, a severe thunderstorm was located 7 miles northeast
  of Nunn, or 24 miles northeast of Fort Collins, moving northeast at
  25 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will remain over mainly rural areas of
  northwestern Weld County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4072 10430 4069 10474 4100 10482 4100 10441
TIME...MOT...LOC 0632Z 242DEG 20KT 4079 10470 

HAIL...1.25IN
WIND...<50MPH
 
$$

MEIER

2 follow-up statements

680 
WWUS55 KBOU 260657
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
1257 AM MDT Sun May 26 2019

COC123-260715-
/O.CON.KBOU.SV.W.0021.000000T0000Z-190526T0715Z/
Weld CO-
1257 AM MDT Sun May 26 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM MDT
FOR NORTH CENTRAL WELD COUNTY...

At 1257 AM MDT, a severe thunderstorm was located 13 miles north of
Purcell, or 27 miles southeast of Cheyenne, moving northeast at 25
mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of north
central Weld County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4076 10432 4074 10459 4086 10467 4086 10478
      4100 10482 4100 10441
TIME...MOT...LOC 0657Z 240DEG 21KT 4081 10450 

HAIL...1.25IN
WIND...<50MPH
 
$$

MEIER

470 
WWUS55 KBOU 260704
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
104 AM MDT Sun May 26 2019

COC123-260714-
/O.CAN.KBOU.SV.W.0021.000000T0000Z-190526T0715Z/
Weld CO-
104 AM MDT Sun May 26 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WELD COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 4076 10432 4074 10459 4086 10467 4086 10478
      4100 10482 4100 10441
TIME...MOT...LOC 0700Z 242DEG 20KT 4083 10445 

$$

MEIER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 12:00 AM MDT	Special Weather Statement	BOU	Weld	45 min
May 26, 3:51 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	39 min
May 26, 3:57 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	48 min
May 26, 4:13 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	30 min
May 26, 4:17 PM MDT	Tornado Warning	BOU	Weld	28 min
May 26, 4:20 PM MDT	Severe Thunderstorm Warning	BOU	Weld	40 min
May 26, 4:34 PM MDT	Tornado Warning	BOU	Adams, Arapahoe	26 min
May 26, 4:39 PM MDT	Severe Thunderstorm Warning	BOU	Weld	21 min
May 26, 5:04 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
May 26, 5:17 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	43 min
May 26, 5:23 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver	32 min
May 26, 5:30 PM MDT	Tornado Warning	BOU	Adams	15 min
May 26, 5:33 PM MDT	Severe Thunderstorm Warning	BOU	Weld	42 min
May 26, 5:42 PM MDT	Tornado Warning	BOU	Weld	33 min
May 26, 5:47 PM MDT	Tornado Warning	BOU	Lincoln	28 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2019 Every severe thunderstorm warning in 2019

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.