Alert archive / Colorado / Tornado Warnings in 2018
Tornado Warning 17, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 17, 2018, 1:51 PM MDT for Sedgwick County, Colorado. It was in force for 24 min. 2 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
- Jun 17, 2018, 1:51 PM MDT (19:51 UTC)
- Expired
- Jun 17, 2018, 2:15 PM MDT
- In force
- 24 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.25 in
County Sedgwick County, CO
The radar
The Goodland radar (KGLD), 184 km from the middle of the area, began a volume at 19:53 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 |
|---|---|---|---|
| Jun 17, 1:57 PM MDT | HAIL 1 | 4 Ne Sedgwick, CO | |
| Jun 17, 2:10 PM MDT | TSTM WND DMG | 1 Wnw Julesburg, CO | POWER POLES BLOWN DOWN IN THE JULESBURG VICINITY. POWER KNOCKED OUT IN THE REGION. CROP DAMAGE REPORTED WEST OF JULESBURG. WINDS ESTIMATED AT 60 TO 70 MPH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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, 7.9 hours before the alert went out and 133 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.
288
WFUS55 KBOU 171951
TORBOU
COC115-172015-
/O.NEW.KBOU.TO.W.0017.180617T1951Z-180617T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
151 PM MDT SUN JUN 17 2018
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
Northwestern Sedgwick County in northeastern Colorado...
* Until 215 PM MDT.
* At 151 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Sedgwick, or 13 miles southwest of Julesburg,
moving northeast at 20 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...
Julesburg, Ovid and Sedgwick.
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 4082 10245 4094 10261 4100 10256 4100 10223
TIME...MOT...LOC 1951Z 209DEG 16KT 4090 10249
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
RPK1 follow-up statement
909
WWUS55 KBOU 172000
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
200 PM MDT SUN JUN 17 2018
COC115-172015-
/O.CON.KBOU.TO.W.0017.000000T0000Z-180617T2015Z/
Sedgwick CO-
200 PM MDT SUN JUN 17 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 PM MDT FOR
NORTHWESTERN SEDGWICK COUNTY...
At 159 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Ovid, or 8 miles west of Julesburg, moving northeast
at 20 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Julesburg, Ovid and Sedgwick.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4085 10243 4094 10256 4100 10253 4100 10223
TIME...MOT...LOC 1959Z 221DEG 18KT 4096 10243
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
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, 2:13 PM MDT | Tornado Warning | BOU | Sedgwick | 17 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.