Alert archive / Colorado / Tornado Warnings in 2018
Tornado Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 17, 2018, 2:13 PM MDT for Sedgwick County, Colorado. It was in force for 17 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
- Jun 17, 2018, 2:13 PM MDT (20:13 UTC)
- Expired
- Jun 17, 2018, 2:30 PM MDT
- In force
- 17 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.5 in
County Sedgwick County, CO
The radar
The Goodland radar (KGLD), 183 km from the middle of the area, began a volume at 20:15 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 |
|---|---|---|---|
| Jun 17, 1:35 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 8.2 hours before the alert went out and 143 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
- 1003 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -69 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
799
WFUS55 KBOU 172013
TORBOU
COC115-172030-
/O.NEW.KBOU.TO.W.0018.180617T2013Z-180617T2030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
213 PM MDT SUN JUN 17 2018
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
North central Sedgwick County in northeastern Colorado...
* Until 230 PM MDT.
* At 213 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Ovid, or 4 miles west of Julesburg, moving
northeast at 20 mph.
HAZARD...Tornado and tennis 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...
Julesburg and Ovid.
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 4089 10231 4100 10246 4100 10216
TIME...MOT...LOC 2013Z 223DEG 20KT 4099 10235
TORNADO...RADAR INDICATED
HAIL...2.50IN
$$
RPK1 follow-up statement
838
WWUS55 KBOU 172031
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
231 PM MDT SUN JUN 17 2018
COC115-172040-
/O.EXP.KBOU.TO.W.0018.000000T0000Z-180617T2030Z/
Sedgwick CO-
231 PM MDT SUN JUN 17 2018
...THE TORNADO WARNING FOR NORTH CENTRAL SEDGWICK COUNTY HAS
EXPIRED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.
A Tornado Watch remains in effect until 900 PM MDT for northeastern
Colorado.
LAT...LON 4089 10231 4100 10246 4100 10216
TIME...MOT...LOC 2030Z 223DEG 20KT 4106 10227
$$
RPKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 1:40 PM MDT | Special Weather Statement | BOU | Sedgwick | 35 min |
| Jun 17, 1:44 PM MDT | Severe Thunderstorm Warning | BOU | Sedgwick | 31 min |
| Jun 17, 1:51 PM MDT | Tornado Warning | BOU | Sedgwick | 24 min |
| Jun 17, 2:36 PM MDT | Areal Flood Advisory | BOU | Douglas | 114 min |
| Jun 17, 3:52 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 38 min |
| Jun 17, 4:20 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 25 min |
| Jun 17, 4:32 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 43 min |
| Jun 17, 4:58 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 47 min |
| Jun 17, 5:05 PM MDT | Tornado Warning | BOU | Washington | 25 min |
| Jun 17, 5:29 PM MDT | Tornado Warning | BOU | Washington | 20 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.