Alert archive / Colorado / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 5, NWS Denver/Boulder, CO

April 26, 2012Logan County, Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 26, 2012, 6:03 PM MDT for Logan County, Morgan County, Weld County, Colorado. It was in force for 57 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: Apr 26, 2012, 6:03 PM MDT (00:03 UTC)
Expired: Apr 26, 2012, 7:00 PM MDT
In force: 57 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Logan County, CO, Morgan County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 130 km from the middle of the area, began a volume at 00:04 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 nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.1 hours before the alert went out and 87 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: 95 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 2538 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

609 
WUUS55 KBOU 270003
SVRBOU
COC075-087-123-270100-
/O.NEW.KBOU.SV.W.0005.120427T0003Z-120427T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
603 PM MDT THU APR 26 2012

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MORGAN COUNTY IN NORTHEAST COLORADO
  SOUTHWESTERN LOGAN COUNTY IN NORTHEAST COLORADO
  EXTREME EAST CENTRAL WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 700 PM MDT

* AT 603 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
  AND DAMAGING WINDS UP TO ABOUT 60 MPH.  THIS STORM WAS LOCATED 7
  MILES SOUTHWEST OF WILLARD...OR 19 MILES NORTHEAST OF FORT
  MORGAN...MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WILLARD...
  PAWNEE PASS...NORTH STERLING RESERVOIR...LOGAN CORNERS AND
  STERLING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

&&

LAT...LON 4083 10335 4066 10305 4040 10359 4050 10370
TIME...MOT...LOC 0003Z 227DEG 21KT 4050 10356
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

093 
WWUS55 KBOU 270015
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
615 PM MDT THU APR 26 2012

COC087-123-270025-
/O.CAN.KBOU.SV.W.0005.000000T0000Z-120427T0100Z/
MORGAN CO-WELD CO-
615 PM MDT THU APR 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL WELD AND
NORTHEASTERN MORGAN COUNTIES IS CANCELLED...

LAT...LON 4066 10305 4047 10345 4048 10347 4052 10347
      4052 10355 4054 10358 4083 10335
TIME...MOT...LOC 0015Z 222DEG 18KT 4054 10353

$$

COC075-270100-
/O.CON.KBOU.SV.W.0005.000000T0000Z-120427T0100Z/
LOGAN CO-
615 PM MDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR SOUTHWESTERN LOGAN COUNTY...

AT 615 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...AND
DAMAGING WINDS UP TO ABOUT 60 MPH.  THIS STORM WAS LOCATED 3 MILES
SOUTHWEST OF WILLARD...OR 19 MILES WEST OF STERLING...MOVING
NORTHEAST AT 20 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WILLARD...PAWNEE PASS...NORTH STERLING RESERVOIR...LOGAN CORNERS AND
STERLING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

&&

LAT...LON 4066 10305 4047 10345 4048 10347 4052 10347
      4052 10355 4054 10358 4083 10335
TIME...MOT...LOC 0015Z 222DEG 18KT 4054 10353
WIND...HAIL 60MPH 1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 6:57 PM MDT	Severe Thunderstorm Warning	BOU	Logan	63 min
Apr 27, 12:29 AM MDT	Special Weather Statement	BOU	Lincoln	61 min
Apr 27, 2:32 AM MDT	Areal Flood Advisory	BOU	Lincoln	88 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2012 Every severe thunderstorm warning in 2012

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.