Alert archive / Colorado / Tornado Warnings in 2018
Tornado Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 27, 2018, 1:45 PM MDT for Adams County, Weld County, Colorado. It was in force for 30 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 27, 2018, 1:45 PM MDT (19:45 UTC)
- Expired
- May 27, 2018, 2:15 PM MDT
- In force
- 30 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Adams County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 34 km from the middle of the area, began a volume at 19:48 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 27, 1:13 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 7.8 hours before the alert went out and 99 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4365 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
119
WFUS55 KBOU 271945
TORBOU
COC001-123-272015-
/O.NEW.KBOU.TO.W.0002.180527T1945Z-180527T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
145 PM MDT SUN MAY 27 2018
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
South central Weld County in northeastern Colorado...
North central Adams County in northeastern Colorado...
* Until 215 PM MDT.
* At 145 PM MDT, a severe thunderstorm capable of producing a tornado
was located 4 miles south of Prospect Valley, or 33 miles southeast
of Greeley, moving north at 20 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Expect damage to mobile homes, roofs, and vehicles.
* Locations impacted include...
Keenesburg, Prospect Valley and Roggen.
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 3997 10426 3996 10450 4018 10453 4020 10427
TIME...MOT...LOC 1945Z 189DEG 17KT 4002 10441
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RPK2 follow-up statements
181
WWUS55 KBOU 271956
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
156 PM MDT SUN MAY 27 2018
COC001-272006-
/O.CAN.KBOU.TO.W.0002.000000T0000Z-180527T2015Z/
Adams CO-
156 PM MDT SUN MAY 27 2018
...THE TORNADO WARNING FOR NORTH CENTRAL ADAMS COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
northeastern Colorado.
LAT...LON 4000 10426 4000 10450 4018 10453 4020 10427
TIME...MOT...LOC 1956Z 189DEG 17KT 4007 10440
$$
COC123-272015-
/O.CON.KBOU.TO.W.0002.000000T0000Z-180527T2015Z/
Weld CO-
156 PM MDT SUN MAY 27 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 PM MDT FOR SOUTH
CENTRAL WELD COUNTY...
At 156 PM MDT, a severe thunderstorm capable of producing a tornado
was located over Prospect Valley, or 30 miles southeast of Greeley,
moving north at 20 mph.
HAZARD...TORNADO.
SOURCE...Radar indicated rotation.
IMPACT...Expect damage to mobile homes, roofs, and vehicles.
Locations impacted include...
Keenesburg, Prospect Valley and Roggen.
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 4000 10426 4000 10450 4018 10453 4020 10427
TIME...MOT...LOC 1956Z 189DEG 17KT 4007 10440
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RPK124
WWUS55 KBOU 272015
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
215 PM MDT SUN MAY 27 2018
COC123-272024-
/O.EXP.KBOU.TO.W.0002.000000T0000Z-180527T2015Z/
Weld CO-
215 PM MDT SUN MAY 27 2018
...THE TORNADO WARNING FOR SOUTH CENTRAL WELD COUNTY WILL EXPIRE AT
215 PM MDT...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.
A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
northeastern Colorado.
LAT...LON 4000 10426 4000 10450 4018 10453 4020 10427
TIME...MOT...LOC 2014Z 189DEG 17KT 4015 10438
$$
RPKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 12:27 PM MDT | Special Weather Statement | BOU | Larimer | 33 min |
| May 27, 2:14 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 31 min |
| May 27, 2:23 PM MDT | Severe Thunderstorm Warning | BOU | Phillips | 50 min |
| May 27, 2:44 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 31 min |
| May 27, 2:47 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 31 min |
| May 27, 3:06 PM MDT | Tornado Warning | BOU | Morgan, Weld | 24 min |
| May 27, 3:36 PM MDT | Special Weather Statement | BOU | Lincoln | 24 min |
| May 27, 4:20 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 40 min |
| May 27, 4:28 PM MDT | Tornado Warning | BOU | Morgan | 17 min |
| May 27, 4:37 PM MDT | Tornado Warning | BOU | Morgan | 23 min |
| May 27, 4:58 PM MDT | Tornado Warning | BOU | Morgan, Weld | 18 min |
| May 27, 5:21 PM MDT | Special Weather Statement | BOU | Logan | 39 min |
| May 27, 5:38 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 52 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.