Alert archive / Wyoming / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 13, NWS Cheyenne, WY

May 10, 2004Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 10, 2004, 9:30 PM MDT for Niobrara County, Wyoming. It was in force for 60 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: May 10, 2004, 9:30 PM MDT (03:30 UTC)
Expired: May 10, 2004, 10:30 PM MDT
In force: 60 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 151 km from the middle of the area, began a volume at 03:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 10, 7:30 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 3.5 hours before the alert went out and 144 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: 1757 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 620 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.

967 
WUUS55 KCYS 110330
SVRCYS

ZCZC DEF
TTAA00 KCYS 110328

WYC027-110430-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
928 PM MDT MON MAY 10 2004

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NIOBRARA COUNTY IN EAST CENTRAL WYOMING

* UNTIL 1030 PM MDT

* AT 925 PM MDT...TRAINED WEATHER SPOTTERS AT REDBIRD REPORTED A     
  SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL. THIS STORM WAS    
  LOCATED NEAR REDBIRD...OR ABOUT 23 MILES WEST OF EDGEMONT...AND    
  MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHEASTERN NIOBRARA COUNTY AT 1000 PM MDT

THIS STORM HAS A HISTORY OF PRODUCING LARGE DAMAGING HAIL. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS

LAT...LON 4331 10448 4309 10424 4313 10408 4348 10410

$$

RUBIN

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 10, 6:06 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Laramie	54 min
May 10, 6:30 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	60 min
May 10, 6:53 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
May 10, 7:28 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	62 min
May 10, 7:45 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	60 min
May 10, 8:33 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	57 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2004 Every severe thunderstorm warning in 2004

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.