Alert archive / Colorado / Tornado Warnings in 2019

Tornado Warning 2, NWS Denver/Boulder, CO

May 26, 2019Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 26, 2019, 4:17 PM MDT for Weld County, Colorado. It was in force for 28 min. 4 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: May 26, 2019, 4:17 PM MDT (22:17 UTC)
Expired: May 26, 2019, 4:45 PM MDT
In force: 28 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

County Weld County, CO

The radar

The Denver radar (KFTG), 47 km from the middle of the area, began a volume at 22:19 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
May 26, 4:27 PM MDT	HAIL 1.5	5 Sse Milton Reservoir, CO
May 26, 4:32 PM MDT	TSTM WND GST 60	3 Wnw Keenesburg, CO
May 26, 4:38 PM MDT	TORNADO	1 Nw Keenesburg, CO	BRIEF TOUCHDOWN IN OPEN FIELD. NO DAMAGE REPORTED.
May 26, 4:53 PM MDT	TORNADO	3 Nw Roggen, CO	CORRECTS PREVIOUS TORNADO REPORT FROM 6 NW ROGGEN. BRIEF TOUCHDOWN, THEN BECAME QUICKLY RAIN WRAPPED AND NOT VISIBLE. NO DAMAGE REPORTED.

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
May 26, 3:46 PM MDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.3 hours before the alert went out and 115 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1575 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

941 
WFUS55 KBOU 262217
TORBOU
COC123-262245-
/O.NEW.KBOU.TO.W.0002.190526T2217Z-190526T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
417 PM MDT Sun May 26 2019

The National Weather Service in Denver Colorado has issued a

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

* Until 445 PM MDT.
    
* At 417 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 5 miles northwest of Keenesburg, or 20 miles south of
  Greeley, moving north 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.

* This dangerous storm will be near...
  Milton Reservoir around 425 PM MDT.
  Kersey around 445 PM MDT.

Other locations impacted by this tornadic thunderstorm include Lower
Latham Reservoir and Hardin.

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 4006 10445 4010 10477 4042 10463 4040 10426
TIME...MOT...LOC 2217Z 193DEG 29KT 4015 10460 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

RPK

2 follow-up statements

591 
WWUS55 KBOU 262227
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
427 PM MDT Sun May 26 2019

COC123-262245-
/O.CON.KBOU.TO.W.0002.000000T0000Z-190526T2245Z/
Weld CO-
427 PM MDT Sun May 26 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM MDT FOR SOUTH
CENTRAL WELD COUNTY...
    
At 427 PM MDT, a severe thunderstorm capable of producing a tornado
was located 5 miles southeast of Milton Reservoir, or 18 miles
southeast of Greeley, moving northeast at 25 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.

This tornadic thunderstorm will remain over mainly rural areas of
south central Weld County, including the following locations... Lower
Latham Reservoir and Hardin.

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 4006 10445 4010 10477 4042 10463 4040 10426
TIME...MOT...LOC 2227Z 225DEG 21KT 4019 10454 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

RPK

651 
WWUS55 KBOU 262248
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
448 PM MDT Sun May 26 2019

COC123-262258-
/O.EXP.KBOU.TO.W.0002.000000T0000Z-190526T2245Z/
Weld CO-
448 PM MDT Sun May 26 2019

...THE TORNADO WARNING FOR SOUTH CENTRAL WELD COUNTY HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been allowed to expire.  However small
hail is still possible with this thunderstorm.

A Tornado Watch remains in effect until 900 PM MDT for northeastern
Colorado.

LAT...LON 4006 10445 4010 10477 4042 10463 4040 10426
TIME...MOT...LOC 2248Z 193DEG 29KT 4035 10449 

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 12:00 AM MDT	Special Weather Statement	BOU	Weld	45 min
May 26, 12:33 AM MDT	Severe Thunderstorm Warning	BOU	Weld	31 min
May 26, 3:51 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	39 min
May 26, 3:57 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	48 min
May 26, 4:13 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	30 min
May 26, 4:20 PM MDT	Severe Thunderstorm Warning	BOU	Weld	40 min
May 26, 4:34 PM MDT	Tornado Warning	BOU	Adams, Arapahoe	26 min
May 26, 4:39 PM MDT	Severe Thunderstorm Warning	BOU	Weld	21 min
May 26, 5:04 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
May 26, 5:17 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	43 min
May 26, 5:23 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver	32 min
May 26, 5:30 PM MDT	Tornado Warning	BOU	Adams	15 min
May 26, 5:33 PM MDT	Severe Thunderstorm Warning	BOU	Weld	42 min
May 26, 5:42 PM MDT	Tornado Warning	BOU	Weld	33 min
May 26, 5:47 PM MDT	Tornado Warning	BOU	Lincoln	28 min

Nearby

Tornado Warnings in Colorado, 2019 Every tornado warning in 2019 Tornadoes in 2019

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.