Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Denver/Boulder, CO

May 14, 2021Morgan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 14, 2021, 7:40 PM MDT for Morgan County, Washington County, Colorado. It was in force for 50 min. 5 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 14, 2021, 7:40 PM MDT (01:40 UTC)
Expired: May 14, 2021, 8:30 PM MDT
In force: 50 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Morgan County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 98 km from the middle of the area, began a volume at 01:44 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 14, 7:40 PM MDT	HAIL 1.5	Brush, CO	REPORT FROM MPING: PING PONG BALL (1.50 IN.).
May 14, 7:41 PM MDT	HAIL 1.75	1 E Brush, CO
May 14, 7:41 PM MDT	HAIL 1.75	1 Wnw Snyder, CO
May 14, 7:41 PM MDT	HAIL 1.75	3 E Brush, CO	NEAR BRUSH AIRPORT.
May 14, 7:44 PM MDT	HAIL 2.3	5 E Brush, 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
May 14, 3:46 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 46 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: 137 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1940 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

432 
WUUS55 KBOU 150140
SVRBOU
COC087-121-150230-
/O.NEW.KBOU.SV.W.0023.210515T0140Z-210515T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
740 PM MDT Fri May 14 2021

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Southeastern Morgan County in northeastern Colorado...
  Central Washington County in northeastern Colorado...

* Until 830 PM MDT.

* At 739 PM MDT, a severe thunderstorm was located 4 miles southeast
  of Snyder, or 13 miles east of Fort Morgan, moving southeast at 25
  mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees. People and 
           animals outdoors will be injured. Expect hail damage to 
           roofs, siding, windows, and vehicles.

* Locations impacted include...
  Akron, Brush, Hillrose, Gary, Snyder and Midway. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4033 10372 4040 10351 4000 10303 4000 10370
TIME...MOT...LOC 0139Z 323DEG 20KT 4027 10355 

HAIL...1.75IN
WIND...60MPH
 
$$

DIRENZO

2 follow-up statements

123 
WWUS55 KBOU 150206
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
806 PM MDT Fri May 14 2021

COC087-121-150230-
/O.CON.KBOU.SV.W.0023.000000T0000Z-210515T0230Z/
Morgan CO-Washington CO-
806 PM MDT Fri May 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR SOUTHEASTERN MORGAN AND CENTRAL WASHINGTON COUNTIES...

At 805 PM MDT, a severe thunderstorm was located 5 miles south of
Midway, or 11 miles west of Akron, moving southeast at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees. People and 
         animals outdoors will be injured. Expect hail damage to 
         roofs, siding, windows, and vehicles.

Locations impacted include...
Akron and Midway. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4025 10358 4033 10343 4000 10303 4000 10356
TIME...MOT...LOC 0205Z 321DEG 20KT 4015 10342 

HAIL...1.75IN
WIND...60MPH
 
$$

DIRENZO

891 
WWUS55 KBOU 150223
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
823 PM MDT Fri May 14 2021

COC087-121-150233-
/O.EXP.KBOU.SV.W.0023.000000T0000Z-210515T0230Z/
Morgan CO-Washington CO-
823 PM MDT Fri May 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORGAN AND
CENTRAL WASHINGTON COUNTIES WILL EXPIRE AT 830 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northeastern Colorado.

LAT...LON 4025 10358 4033 10343 4000 10303 4000 10356
TIME...MOT...LOC 0223Z 323DEG 20KT 4008 10335 

$$

DIRENZO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 6:49 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
May 14, 6:52 PM MDT	Special Weather Statement	BOU	Morgan	38 min
May 14, 7:17 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	28 min
May 14, 7:36 PM MDT	Severe Thunderstorm Warning	BOU	Weld	39 min
May 14, 8:14 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	46 min
May 14, 8:52 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	38 min
May 14, 9:29 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan, Washington	46 min
May 15, 2:21 PM MDT	Special Weather Statement	BOU	Larimer	24 min
May 15, 2:50 PM MDT	Special Weather Statement	BOU	Denver	25 min
May 15, 5:29 PM MDT	Special Weather Statement	BOU	Douglas	31 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2021 Every severe thunderstorm warning in 2021

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.