Alert archive / Colorado / Tornado Warnings in 2018
Tornado Warning 50, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Aug 8, 2018, 6:27 AM MDT for Weld County, Colorado. It was in force for 33 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 8, 2018, 6:27 AM MDT (12:27 UTC)
- Expired
- Aug 8, 2018, 7:00 AM MDT
- In force
- 33 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.25 in
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 82 km from the middle of the area, began a volume at 12:31 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 8, 6:33 AM MDT | HAIL 1.25 | 3 Ne Pawnee Buttes, CO | |
| Aug 8, 6:37 AM MDT | TORNADO | 1 Nw Keota, CO | BRIEF TOUCHDOWN IN OPEN FIELD. NO DAMAGE REPORTED. NO INJURIES. |
| Aug 8, 6:37 AM MDT | TORNADO | 5 Nnw Keota, CO | CORRECTS PREVIOUS TORNADO REPORT FROM 1 NW KEOTA. BRIEF TOUCHDOWN IN OPEN FIELD. NO DAMAGE REPORTED. NO INJURIES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 0.5 hours before the alert went out and 118 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
- 965 J/kg
- Mixed-layer CIN
- -187 J/kg
- Mixed-layer LCL
- 1263 m above ground
- 0-6 km bulk shear
- 28 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
The text
As transmitted.
641
WFUS55 KBOU 081227
TORBOU
COC123-081300-
/O.NEW.KBOU.TO.W.0050.180808T1227Z-180808T1300Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
627 AM MDT WED AUG 8 2018
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
Northeastern Weld County in northeastern Colorado...
* Until 700 AM MDT.
* At 627 AM MDT, a severe thunderstorm capable of producing a tornado
was located near Pawnee Buttes, or 31 miles southwest of Kimball,
moving south at 25 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* Locations impacted include...
Pawnee Buttes and Keota.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4087 10404 4088 10376 4061 10381 4065 10417
TIME...MOT...LOC 1227Z 013DEG 23KT 4082 10394
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
SCHLATTER1 follow-up statement
468
WWUS55 KBOU 081239
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
639 AM MDT WED AUG 8 2018
COC123-081300-
/O.CON.KBOU.TO.W.0050.000000T0000Z-180808T1300Z/
Weld CO-
639 AM MDT WED AUG 8 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 AM MDT FOR
NORTHEASTERN WELD COUNTY...
At 639 AM MDT, a severe thunderstorm capable of producing a tornado
was located near Pawnee Buttes, or 34 miles southwest of Kimball,
moving south at 15 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Pawnee Buttes and Keota.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4083 10402 4081 10382 4061 10381 4065 10417
TIME...MOT...LOC 1239Z 011DEG 12KT 4078 10395
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
SCHLATTERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 6:07 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 38 min |
| Aug 7, 6:14 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 27 min |
| Aug 7, 7:24 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 19 min |
| Aug 8, 12:13 AM MDT | Special Weather Statement | BOU | Lincoln | 47 min |
| Aug 8, 4:46 AM MDT | Special Weather Statement | BOU | Logan | 44 min |
| Aug 8, 5:52 AM MDT | Special Weather Statement | BOU | Logan | 38 min |
| Aug 8, 5:56 AM MDT | Special Weather Statement | BOU | Washington | 34 min |
| Aug 8, 6:17 AM MDT | Severe Thunderstorm Warning | BOU | Weld | 43 min |
| Aug 8, 6:57 AM MDT | Tornado Warning | BOU | Weld | 33 min |
| Aug 8, 7:28 AM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 47 min |
| Aug 8, 8:17 AM MDT | Special Weather Statement | BOU | Morgan | 28 min |
| Aug 8, 8:30 AM MDT | Special Weather Statement | BOU | Elbert | 45 min |
| Aug 8, 8:58 AM MDT | Severe Thunderstorm Warning | BOU | Elbert | 47 min |
| Aug 8, 9:39 AM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 33 min |
Nearby
Tornado Warnings in Colorado, 2018Every tornado warning in 2018Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.