Alert archive / Colorado / Tornado Warnings in 2017
Tornado Warning 10, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 12, 2017, 3:45 PM MDT for 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
- Jun 12, 2017, 3:45 PM MDT (21:45 UTC)
- Expired
- Jun 12, 2017, 4:15 PM MDT
- In force
- 30 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.5 in
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 33 km from the middle of the area, began a volume at 21:46 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 12, 1:11 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 9.8 hours before the alert went out and 166 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
- 697 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 1130 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
378
WFUS55 KBOU 122145
TORBOU
COC123-122215-
/O.NEW.KBOU.TO.W.0010.170612T2145Z-170612T2215Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
345 PM MDT MON JUN 12 2017
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
Northwestern Weld County in northeastern Colorado...
* Until 415 PM MDT
* At 344 PM MDT, a severe thunderstorm capable of producing a tornado
was located 4 miles southeast of Rockport, or 20 miles south of
Cheyenne, moving northeast at 40 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.
* This tornadic thunderstorm will remain over mainly rural areas of
northwestern Weld County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area.
Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.
&&
LAT...LON 4076 10473 4081 10486 4100 10472 4100 10439
TIME...MOT...LOC 2144Z 212DEG 33KT 4085 10475
TORNADO...RADAR INDICATED
HAIL...2.50IN
$$
BAKER1 follow-up statement
087
WWUS55 KBOU 122207
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
407 PM MDT MON JUN 12 2017
COC123-122216-
/O.EXP.KBOU.TO.W.0010.000000T0000Z-170612T2215Z/
Weld CO-
407 PM MDT MON JUN 12 2017
...THE TORNADO WARNING FOR NORTHWESTERN WELD COUNTY WILL EXPIRE AT
415 PM MDT...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, hail up to one inch in diameter remain likely
and a Severe Thunderstorm Warning remains in effect for the area.
A tornado watch remains in effect until 800 PM MDT for northeastern
Colorado.
LAT...LON 4076 10473 4081 10486 4100 10472 4100 10439
TIME...MOT...LOC 2206Z 204DEG 22KT 4093 10464
$$
BAKERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:09 PM MDT | Severe Thunderstorm Warning | BOU | Phillips | 51 min |
| Jun 11, 9:13 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 28 min |
| Jun 12, 11:07 AM MDT | Areal Flood Advisory | BOU | Grand | 24 hr |
| Jun 12, 2:29 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 46 min |
| Jun 12, 2:36 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 39 min |
| Jun 12, 3:08 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 26 min |
| Jun 12, 3:15 PM MDT | Tornado Warning | BOU | Weld | 30 min |
| Jun 12, 3:26 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 36 min |
| Jun 12, 3:46 PM MDT | Tornado Warning | BOU | Weld | 29 min |
| Jun 12, 4:13 PM MDT | Tornado Warning | BOU | Weld | 32 min |
| Jun 12, 4:35 PM MDT | Tornado Warning | BOU | Weld | 25 min |
Nearby
Tornado Warnings in Colorado, 2017Every tornado warning in 2017Tornadoes in 2017
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.