Alert archive / Nebraska / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 13, NWS Cheyenne, WY

May 7, 2008Goshen County, Wyoming; Scotts Bluff County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 7, 2008, 7:55 PM MDT for Goshen County, Wyoming; Scotts Bluff County, Sioux County, Nebraska. It was in force for 50 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 7, 2008, 7:55 PM MDT (01:55 UTC)
Expired
May 7, 2008, 8:45 PM MDT
In force
50 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon

Counties Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 113 km from the middle of the area, began a volume at 01:58 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.

IssuedProductOfficeLasted
Jan 7, 12:52 PM MSTTornado WatchSPC146 days

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.9 hours before the alert went out and 239 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2008-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 373 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2008-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
373 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1767 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KCYS 080156
SVRCYS
NEC157-165-WYC015-080245-
/O.NEW.KCYS.SV.W.0013.080508T0155Z-080508T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
755 PM MDT WED MAY 7 2008

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN SCOTTS BLUFF COUNTY IN THE PANHANDLE OF NEBRASKA...
  THIS INCLUDES THE CITY OF SCOTTSBLUFF...
  SOUTHWESTERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...
  CENTRAL GOSHEN COUNTY IN SOUTHEAST WYOMING...

* UNTIL 845 PM MDT

* AT 749 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
  THUNDERSTORM PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED
  NEAR PACKER LAKE...OR 8 MILES SOUTH OF TORRINGTON...AND MOVING EAST
  AT 22 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LYMAN BY 800 PM...
  STEGALL BY 810 PM...
  MORRILL BY 820 PM...
  MITCHELL BY 835 PM...
  RATTLESNAKE HILL BY 845 PM...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE AT 1-800-269-6220.

LAT...LON 4220 10369 4173 10360 4170 10442 4193 10440
TIME...MOT...LOC 0155Z 258DEG 19KT 4196 10410

$$

GRIFFITH
2 follow-up statements
000 
WWUS55 KCYS 080223
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
823 PM MDT WED MAY 7 2008

NEC157-165-WYC015-080245-
/O.CON.KCYS.SV.W.0013.000000T0000Z-080508T0245Z/
SCOTTS BLUFF NE-SIOUX NE-GOSHEN WY-
823 PM MDT WED MAY 7 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MDT
FOR EAST CENTRAL GOSHEN...SOUTHWESTERN SIOUX AND WESTERN SCOTTS BLUFF
COUNTIES...

AT 815 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED
NEAR MORRILL...OR 13 MILES SOUTHEAST OF TORRINGTON...MOVING EAST AT
22 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MITCHELL BY 835 PM...
  RATTLESNAKE HILL BY 845 PM...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE AT 1-800-269-6220.

LAT...LON 4173 10360 4173 10368 4171 10387 4172 10397
      4171 10399 4170 10406 4171 10424 4192 10426
      4220 10370
TIME...MOT...LOC 0223Z 258DEG 19KT 4199 10391

$$

GRIFFITH
000 
WWUS55 KCYS 080250
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
847 PM MDT WED MAY 7 2008

NEC157-165-WYC015-080257-
/O.EXP.KCYS.SV.W.0013.000000T0000Z-080508T0245Z/
SCOTTS BLUFF NE-SIOUX NE-GOSHEN WY-
847 PM MDT WED MAY 7 2008

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GOSHEN...
SOUTHWESTERN SIOUX AND WESTERN SCOTTS BLUFF COUNTIES HAS EXPIRED...

...SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL GOSHEN 
COUNTY IN WYOMING...AND FOR SCOTTS BLUFF COUNTY IN THE PANHANDLE OF 
NEBRASKA CONTINUES...

THE STORM HAS EXITED PORTIONS OF THE PREVIOUSLY WARNED AREA IN 
WYOMING...THEREFORE THE ORIGINAL WARNING WILL BE ALLOWED TO EXPIRE.  
THE STORM REMAINS SEVERE AND HAS PROMPTED A NEW WARNING AS IT MOVES 
EAST INTO NEBRASKA.  

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE AT 1-800-269-6220.

LAT...LON 4173 10360 4173 10368 4171 10387 4172 10397
      4171 10399 4170 10406 4171 10424 4192 10426
      4220 10370
TIME...MOT...LOC 0223Z 258DEG 19KT 4199 10391

$$

SOWKO

The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 6:39 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte36 min
May 7, 7:17 PM MDTSevere Thunderstorm WarningCYSGoshen43 min
May 7, 8:43 PM MDTSevere Thunderstorm WarningCYSGoshen44 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2008Severe Thunderstorm Warnings in Wyoming, 2008Every severe thunderstorm warning in 2008

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.