Alert archive / Colorado / Tornado Warnings in 2018
Tornado Warning 19, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 17, 2018, 5:05 PM MDT for Washington County, Colorado. It was in force for 25 min. 1 report 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, 5:05 PM MDT (23:05 UTC)
- Expired
- Jun 17, 2018, 5:30 PM MDT
- In force
- 25 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.5 in
County Washington County, CO
The radar
The Goodland radar (KGLD), 124 km from the middle of the area, began a volume at 23:06 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, 5:13 PM MDT | HAIL 1 | 5 Ese Elba, CO |
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, 11.1 hours before the alert went out and 25 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.
259
WFUS55 KBOU 172305
TORBOU
COC121-172330-
/O.NEW.KBOU.TO.W.0019.180617T2305Z-180617T2330Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
505 PM MDT SUN JUN 17 2018
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
East central Washington County in northeastern Colorado...
* Until 530 PM MDT.
* At 505 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Elba, or 18 miles south of Akron, moving east at
35 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...
Elba.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area.
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 3995 10280 3982 10281 3977 10323 4004 10323
4007 10280
TIME...MOT...LOC 2305Z 257DEG 29KT 3989 10316
TORNADO...RADAR INDICATED
HAIL...2.50IN
$$
RPK1 follow-up statement
747
WWUS55 KBOU 172315
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
515 PM MDT SUN JUN 17 2018
COC121-172330-
/O.CON.KBOU.TO.W.0019.000000T0000Z-180617T2330Z/
Washington CO-
515 PM MDT SUN JUN 17 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR EAST
CENTRAL WASHINGTON COUNTY...
At 515 PM MDT, a severe thunderstorm capable of producing a tornado
was located 6 miles east of Elba, or 19 miles southeast of Akron,
moving east at 35 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Elba.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!
&&
LAT...LON 3995 10280 3982 10281 3977 10323 4004 10323
4007 10280
TIME...MOT...LOC 2315Z 257DEG 29KT 3991 10305
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
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, 2:13 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, 5:29 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.