Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 22, NWS Denver/Boulder, CO

June 19, 2018Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 19, 2018, 1:40 PM MDT for Weld County, Colorado. It was in force for 35 min. 3 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 19, 2018, 1:40 PM MDT (19:40 UTC)
Expired: Jun 19, 2018, 2:15 PM MDT
In force: 35 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

County Weld County, CO

The radar

The Denver radar (KFTG), 33 km from the middle of the area, began a volume at 19:42 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 19, 1:46 PM MDT	HAIL 2	2 Ne Hudson, CO
Jun 19, 1:49 PM MDT	HAIL 1.25	Hudson, CO
Jun 19, 2:19 PM MDT	TORNADO	4 Se Prospect Valley, CO	ROPE TORNADO ON THE GROUND FOR APPROXIMATELY 3 MINUTES.

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 19, 12:25 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 7.7 hours before the alert went out and 113 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 30 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 836 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

030 
WFUS55 KBOU 191940
TORBOU
COC123-192015-
/O.NEW.KBOU.TO.W.0022.180619T1940Z-180619T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
140 PM MDT TUE JUN 19 2018

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  South central Weld County in northeastern Colorado...

* Until 215 PM MDT.

* At 140 PM MDT, a severe thunderstorm capable of producing a tornado
  was located near Hudson, or 24 miles south of Greeley, moving east
  at 25 mph.

  HAZARD...Tornado and hail up to two inches in diameter.

  SOURCE...Weather spotters reported funnel cloud.

  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...
  Hudson, 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 4003 10467 4012 10470 4021 10434 4003 10428
TIME...MOT...LOC 1940Z 262DEG 23KT 4009 10461 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

SCHLATTER

2 follow-up statements

499 
WWUS55 KBOU 191952
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
152 PM MDT TUE JUN 19 2018

COC123-192015-
/O.CON.KBOU.TO.W.0022.000000T0000Z-180619T2015Z/
Weld CO-
152 PM MDT TUE JUN 19 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 PM MDT FOR SOUTH
CENTRAL WELD COUNTY...
    
At 151 PM MDT, a severe thunderstorm capable of producing a tornado
was located over Keenesburg, or 25 miles southeast of Greeley, 
moving east at 25 mph.  The strongest rotation is located 2 miles 
southwest of Keenesburg.

HAZARD...Tornado and golf 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...
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 4003 10461 4012 10464 4019 10433 4003 10428
TIME...MOT...LOC 1951Z 262DEG 23KT 4010 10451 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

SCHLATTER

835 
WWUS55 KBOU 192002
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
202 PM MDT TUE JUN 19 2018

COC123-192015-
/O.CON.KBOU.TO.W.0022.000000T0000Z-180619T2015Z/
Weld CO-
202 PM MDT TUE JUN 19 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 PM MDT FOR SOUTH
CENTRAL WELD COUNTY...
    
At 201 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Prospect Valley, or 29 miles southeast of Greeley, 
moving east at 25 mph.  A rotating wall cloud was spotted 3 miles 
west of Prospect Valley.

HAZARD...Tornado and golf 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...
Keenesburg and Prospect Valley. 

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 4003 10458 4011 10460 4017 10432 4003 10428
TIME...MOT...LOC 2001Z 274DEG 20KT 4005 10446 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

SCHLATTER

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 6:12 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Broomfield, Weld	48 min
Jun 18, 6:48 PM MDT	Severe Thunderstorm Warning	BOU	Weld	42 min
Jun 18, 6:59 PM MDT	Severe Thunderstorm Warning	BOU	Weld	31 min
Jun 18, 7:19 PM MDT	Special Weather Statement	BOU	Broomfield	26 min
Jun 18, 7:23 PM MDT	Severe Thunderstorm Warning	BOU	Weld	52 min
Jun 18, 7:24 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Boulder, Broomfield, Weld	51 min
Jun 18, 7:29 PM MDT	Severe Thunderstorm Warning	BOU	Weld	46 min
Jun 18, 8:02 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	28 min
Jun 18, 8:06 PM MDT	Severe Thunderstorm Warning	BOU	Weld	39 min
Jun 18, 8:16 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Boulder, Broomfield, Denver, Jefferson	29 min
Jun 18, 8:27 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	33 min
Jun 18, 8:40 PM MDT	Severe Thunderstorm Warning	BOU	Weld	50 min
Jun 18, 8:44 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Broomfield, Weld	46 min
Jun 18, 9:17 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	28 min
Jun 18, 9:19 PM MDT	Severe Thunderstorm Warning	BOU	Weld	26 min
Jun 18, 9:28 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	32 min
Jun 18, 9:41 PM MDT	Severe Thunderstorm Warning	BOU	Weld	49 min
Jun 18, 9:42 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington	48 min
Jun 18, 9:59 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	31 min
Jun 18, 10:05 PM MDT	Areal Flood Advisory	BOU	Morgan, Weld	2 hr
Jun 18, 10:23 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Washington	37 min
Jun 18, 10:24 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	51 min
Jun 18, 10:49 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
Jun 18, 10:57 PM MDT	Flash Flood Warning	BOU	Morgan, Weld	3 hr
Jun 18, 10:57 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Washington	33 min
Jun 18, 11:24 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips	39 min
Jun 18, 11:32 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	43 min
Jun 18, 11:58 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Washington	25 min
Jun 19, 1:11 AM MDT	Flash Flood Warning	BOU	Morgan, Weld	5 hr
Jun 19, 12:06 PM MDT	Severe Thunderstorm Warning	BOU	Boulder	24 min
Jun 19, 12:29 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Weld	46 min
Jun 19, 12:33 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	42 min
Jun 19, 12:53 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Denver, Douglas, Jefferson	52 min
Jun 19, 12:56 PM MDT	Severe Thunderstorm Warning	BOU	Weld	49 min
Jun 19, 1:14 PM MDT	Tornado Warning	BOU	Weld	31 min
Jun 19, 1:18 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	42 min
Jun 19, 1:29 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	46 min
Jun 19, 1:43 PM MDT	Severe Thunderstorm Warning	BOU	Weld	47 min
Jun 19, 2:02 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	43 min
Jun 19, 2:13 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Weld	47 min
Jun 19, 2:15 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	45 min
Jun 19, 2:20 PM MDT	Tornado Warning Tornado observed	BOU	Adams, Morgan, Weld	25 min
Jun 19, 2:36 PM MDT	Flash Flood Warning	BOU	Morgan, Weld	114 min
Jun 19, 2:43 PM MDT	Severe Thunderstorm Warning	BOU	Weld	47 min
Jun 19, 2:45 PM MDT	Tornado Warning	BOU	Adams, Morgan, Weld	30 min
Jun 19, 2:57 PM MDT	Tornado Warning	BOU	Arapahoe, Elbert	33 min
Jun 19, 3:22 PM MDT	Severe Thunderstorm Warning	BOU	Washington	53 min
Jun 19, 3:26 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	49 min
Jun 19, 3:29 PM MDT	Severe Thunderstorm Warning	BOU	Weld	46 min
Jun 19, 3:30 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas, Elbert	45 min
Jun 19, 3:39 PM MDT	Tornado Warning	BOU	Elbert	36 min
Jun 19, 3:57 PM MDT	Severe Thunderstorm Warning	BOU	Adams	23 min
Jun 19, 4:04 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	41 min
Jun 19, 4:10 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	50 min
Jun 19, 4:15 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	30 min
Jun 19, 4:18 PM MDT	Severe Thunderstorm Warning	BOU	Washington	57 min
Jun 19, 4:32 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	58 min
Jun 19, 4:34 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
Jun 19, 4:42 PM MDT	Tornado Warning	BOU	Lincoln	18 min
Jun 19, 4:51 PM MDT	Tornado Warning	BOU	Morgan	24 min
Jun 19, 4:57 PM MDT	Tornado Warning Tornado observed	BOU	Lincoln	33 min
Jun 19, 5:15 PM MDT	Severe Thunderstorm Warning	BOU	Weld	45 min
Jun 19, 5:22 PM MDT	Tornado Warning	BOU	Lincoln	13 min
Jun 19, 5:24 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	51 min

Nearby

Tornado Warnings in Colorado, 2018 Every tornado warning in 2018 Tornadoes 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.