Alert archive / Colorado / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 252, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 30, 2019, 7:43 PM MDT for Weld County, Colorado. It was in force for 47 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 30, 2019, 7:43 PM MDT (01:43 UTC)
- Expired
- Aug 30, 2019, 8:30 PM MDT
- In force
- 47 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 69 km from the middle of the area, began a volume at 01:45 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 (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 134 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.
- Mixed-layer CAPE
- 335 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 2693 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
899
WUUS55 KBOU 310143
SVRBOU
COC123-310230-
/O.NEW.KBOU.SV.W.0252.190831T0143Z-190831T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
743 PM MDT Fri Aug 30 2019
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
North central Weld County in northeastern Colorado...
* Until 830 PM MDT.
* At 743 PM MDT, a severe thunderstorm was located near Hereford, or
31 miles southeast of Cheyenne, moving east at 15 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
* Locations impacted include...
Hereford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4080 10388 4090 10431 4100 10432 4100 10389
TIME...MOT...LOC 0143Z 280DEG 15KT 4094 10425
HAIL...1.25IN
WIND...60MPH
$$
GIMMESTAD1 follow-up statement
012
WWUS55 KBOU 310214
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
814 PM MDT Fri Aug 30 2019
COC123-310230-
/O.CON.KBOU.SV.W.0252.000000T0000Z-190831T0230Z/
Weld CO-
814 PM MDT Fri Aug 30 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTH CENTRAL WELD COUNTY...
At 813 PM MDT, a severe thunderstorm was located 6 miles east of
Grover, or 32 miles southwest of Kimball, moving east at 15 mph.
Another severe storm was just east of Pawnee Buttes moving northeast
at 25 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
These severe thunderstorms will remain over mainly rural areas of
north central Weld County from east of Grover to northeast of Pawnee
Buttes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4080 10388 4088 10422 4091 10421 4100 10413
4100 10389
TIME...MOT...LOC 0213Z 286DEG 15KT 4089 10410
HAIL...1.25IN
WIND...60MPH
$$
GIMMESTADThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:18 PM MDT | Special Weather Statement | BOU | Weld | 42 min |
| Aug 30, 8:07 PM MDT | Special Weather Statement | BOU | Morgan | 38 min |
| Aug 30, 8:47 PM MDT | Special Weather Statement | BOU | Morgan | 43 min |
| Aug 30, 8:57 PM MDT | Areal Flood Advisory | BOU | Weld | 2 hr |
| Aug 30, 9:22 PM MDT | Special Weather Statement | BOU | Weld | 53 min |
| Aug 30, 10:38 PM MDT | Special Weather Statement | BOU | Morgan | 52 min |
| Aug 30, 11:31 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 44 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2019Every 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.