Alert archive / Colorado / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

May 14, 2021Morgan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 14, 2021, 7:17 PM MDT for Morgan County, Washington County, Colorado. It was in force for 28 min. 6 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, 7:17 PM MDT (01:17 UTC)
Expired: May 14, 2021, 7:45 PM MDT
In force: 28 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Morgan County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 112 km from the middle of the area, began a volume at 01:19 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 14, 7:27 PM MDT	HAIL 1.75	5 Nnw Snyder, CO	QUARTER TO GOLFBALL SIZED HAIL.
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, 1.3 hours before the alert went out and 67 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.

041 
WUUS55 KBOU 150117
SVRBOU
COC087-121-150145-
/O.NEW.KBOU.SV.W.0021.210515T0117Z-210515T0145Z/

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

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Northeastern Morgan County in northeastern Colorado...
  North central Washington County in northeastern Colorado...

* Until 745 PM MDT.

* At 716 PM MDT, a severe thunderstorm was located 4 miles north of
  Snyder, or 13 miles northeast of Fort Morgan, moving southeast at
  25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
           vehicles is expected.

* Locations impacted include...
  Fort Morgan, Brush, Hillrose, Antelope Springs and Snyder. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4050 10347 4049 10346 4044 10347 4044 10341
      4029 10328 4018 10376 4047 10378 4052 10365
TIME...MOT...LOC 0116Z 318DEG 23KT 4038 10361 

HAIL...1.00IN
WIND...60MPH
 
$$

DIRENZO

1 follow-up statement

041 
WWUS55 KBOU 150129
SVSBOU

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

COC087-121-150145-
/O.CON.KBOU.SV.W.0021.000000T0000Z-210515T0145Z/
Morgan CO-Washington CO-
729 PM MDT Fri May 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM MDT
FOR NORTHEASTERN MORGAN AND NORTH CENTRAL WASHINGTON COUNTIES...

At 729 PM MDT, a severe thunderstorm was located over Hillrose, or 14
miles east of Fort Morgan, 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...
Brush, Hillrose, Antelope Springs and Snyder. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4049 10351 4047 10349 4044 10347 4044 10341
      4029 10328 4019 10372 4045 10374 4050 10364
TIME...MOT...LOC 0129Z 318DEG 23KT 4031 10353 

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

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, 7:36 PM MDT	Severe Thunderstorm Warning	BOU	Weld	39 min
May 14, 7:40 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	50 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.