Alert archive / Nebraska / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 116, NWS Cheyenne, WY

September 7, 2006Cheyenne County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Sep 7, 2006, 3:02 PM MDT for Cheyenne County, Nebraska. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 7, 2006, 3:02 PM MDT (21:02 UTC)
Expired
Sep 7, 2006, 3:33 PM MDT
In force
31 min
Issued by
NWS Cheyenne, WY
Area
Counties, with a storm outline in the text

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 152 km from the middle of the area, began a volume at 21:05 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.0 hours before the alert went out and 201 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, N. Platte/Lee Bi, NE at 12:00Z on 2006-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 84 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2006-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 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
84 J/kg
Mixed-layer CIN
-180 J/kg
Mixed-layer LCL
1483 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 7, 2:26 PM MDT, 36 minutes earlier.

Area forecast discussion, Sep 7, 2:26 PM MDT, 36 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
226 PM MDT THU SEP 7 2006

.SHORT TERM...A COOLER AND WETTER PATTERN WILL AFFECT THE CWA
THROUGH SATURDAY. MODELS THROUGH THAT TIME ARE NOW MORE CONSISTENT
AND DEVELOP AN UPPER LOW OVER NORTHERN COLORADO AND SOUTHERN
WYOMING FRIDAY NIGHT AND SATURDAY. AT THE SAME TIME...A SURFACE
COLD FRONT CURRENTLY MOVING INTO NORTHERN MONTANA AND NORTH DAKOTA
WILL BE PUSHED WEST. THE FRONT WILL AT THIS TIME SHOULD MOVE
THROUGH THE EAST PART OF THE CWA FRIDAY AND THROUGH THE REST OF
THE CWA FRIDAY NIGHT. THE SYNOPTIC LIFT FROM BOTH THE UPPER LOW
AND BOUNDARY LAYER UPSLOPE WILL PRODUCE CLOUDY SKIES AND A GOOD
CHANCE OF SHOWERS ACROSS THE CWA AND MAINLY LATE DAY THUNDERSTORMS
STARTING FRIDAY AFTERNOON. MODEL QPF...ESPECIALLY THE NAM WOULD
INDICATE OVER AN INCH OF RAIN IN PARTS OF THE SOUTHERN CWA FRIDAY
AFTERNOON THROUGH SATURDAY. HAVE ALSO CONTINUED THE TREND OF
LOWERING HIGH TEMPERATURES FOR BOTH DAYS.

.LONG TERM...SATURDAY NIGHT THROUGH THURSDAY. SHIELD OF UPSLOPE
GENERATED RAIN MOVES EASTWARD SATURDAY EVENING. THE PATTERN
CONTINUES TO SUGGEST AUTUMN THROUGH THE REST OF THE EXTENDED.
SHOULD BE SOME LEFTOVER PRECIP INTO THE EVENING HOURS...BUT WILL
HAVE TO MONITOR MODEL TIMING ADJUSTMENTS IN SUBSEQUENT FORECASTS.
12Z RUN OF THE GFS IS A LITTLE DIFFERENT FROM THE PREVIOUS RUN
REGARDING THE SYSTEM ON TUESDAY. 00Z RUN KEPT PRECIP IN COLORADO...
BUT NEW RUN DEVELOPS AN UPPER CIRCULATION SOUTH OF THE BLACK HILLS
AND DRAWS PRECIP MUCH FARTHER NORTH. NEXT SYSTEM ON THE HORIZON IS
A STRONG COLD FRONT DIVING SOUTH LATE IN THE WEEK...BUT NEITHER
THE ECMWF OR GFS INDICATING IT WILL HAVE AN IMPACT BY THURSDAY
OTHER THAN POSSIBLY AND INCREASE IN WINDS. POMEROY

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.

&&

SHORT TERM...WEILAND
LONG TERM....POMEROY
Hazardous weather outlook, Sep 7, 10:30 AM MDT, 4 hours 32 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1030 AM MDT THU SEP 7 2006

NEZ001>003-019-WYZ059>070-081630-
SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-CONVERSE-NIOBRARA-
SOUTHWEST CARBON-NORTH CARBON-SNOWY RANGE-NORTH LARAMIE RANGE-
LARAMIE VALLEY-LARAMIE RANGE-PLATTE-GOSHEN-CHEYENNE FOOTHILLS-
PINE BLUFFS-
1030 AM MDT THU SEP 7 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE AND SOUTHEAST WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A WIDELY SCATTERED COVERAGE OF THUNDERSTORMS WILL SPREAD OVER
MUCH OF SOUTHEAST WYOMING AND THE NORTHERN NEBRASKA PANHANDLE
THIS AFTERNOON. THE ACTIVITY WILL PERSIST THROUGH THE EARLY
EVENING BEFORE WEAKENING AND ENDING.  THE STORMS WILL NOT BE
STRONG AS THE ATMOSPHERE IS NOT MOIST AND ONLY MARGINALLY
UNSTABLE. LIGHT RAINFALL AND WIND GUSTS TO 40 MPH CAN BE
EXPECTED WITH THE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

EXPECT UPSLOPE FLOW ACROSS SOUTHEAST WYOMING AND NEBRASKA
PANHANDLE AS A SURFACE LOW DEVELOPS OVER COLORADO. THIS WILL
BRING A CHANCE OF SHOWERS AND THUNDERSTORMS TO THE AREA ON
FRIDAY AND SATURDAY. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED ON SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

NEZ020-021-054-055-081630-
BANNER-MORRILL-KIMBALL-CHEYENNE-
1030 AM MDT THU SEP 7 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A SCATTERED COVERAGE OF THUNDERSTORMS WILL DEVELOP OVER MUCH OF
SOUTHERN NEBRASKA PANHANDLE THIS AFTERNOON. THE ACTIVITY WILL
PERSIST THROUGH THE EARLY EVENING BEFORE WEAKENING AND ENDING.
SOME OF THE STORMS WILL BE STRONG AND PRODUCE SMALL HAIL...
A PERIOD OF MODERATE RAINFALL AND WIND GUSTS TO 45 MPH.  ALL
OF THE ACTIVITY WILL MOVE TO THE SOUTHEAST AT 10 MPH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

EXPECT UPSLOPE FLOW ACROSS THE NEBRASKA PANHANDLE AS A SURFACE LOW
DEVELOPS OVER COLORADO. THIS WILL BRING A CHANCE OF SHOWERS AND
THUNDERSTORMS TO THE AREA ON FRIDAY AND SATURDAY. A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS CAN BE EXPECTED ON SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

WEILAND

In the hours before

Local storm report, Sep 7, 12:52 PM MDT, 2 hours 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 7:37 PM MDTSevere Thunderstorm WarningCYSDawes22 min
Sep 6, 9:45 PM MDTSevere Thunderstorm WarningCYSMorrill59 min
Sep 6, 10:32 PM MDTSevere Thunderstorm WarningCYSBanner30 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2006Every severe thunderstorm warning in 2006

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.