Alert archive / Nebraska / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 115, NWS Cheyenne, WY

September 6, 2006Banner County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Sep 6, 2006, 10:32 PM MDT for Banner County, Nebraska. It was in force for 30 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 6, 2006, 10:32 PM MDT (04:32 UTC)
Expired: Sep 6, 2006, 11:02 PM MDT
In force: 30 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Banner County, NE

The radar

The Cheyenne radar (KCYS), 101 km from the middle of the area, began a volume at 04:36 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

Rapid City, SD (KUNR), launched 00:00Z, 4.5 hours before the alert went out and 289 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: 64 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 3012 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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 6, 9:20 PM MDT, 1 hour 12 minutes earlier.

Area forecast discussion, Sep 6, 9:20 PM MDT, 1 hour 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
920 PM MDT WED SEP 6 2006

.UPDATE...SMALL BAND OF TSTMS CONTINUES MOVING SOUTH THROUGH FAR
EASTERN COUNTIES OF OUR CWA.  ONE STRONG STORM STILL HANGING ON
EAST OF BFF CURRENTLY.  HAVE BEEN TWEAKING GRIDS/ZONES TO COVER
THIS BAND OF TSTMS AS IT MOVED SOUTH.  THESE WILL STILL AFFECT
MORRILL COUNTY UNTIL 05Z...AND CHEYENNE COUNTY ROUGHLY 05-07Z. JLH

&&

.PREV DISCUSSION... (ISSUED 105 PM MDT WED SEP 6 2006)

SHORT TERM...TONIGHT THROUGH FRIDAY...BENIGN PATTERN CONTINUES WITH
WEAK NW FLOW ALOFT AS CWA GENERALLY UNDER A RIDGE THROUGH THIS
PERIOD. SFC PATTERN WILL HAVE HIGH OVER UTAH AND WESTERN WYOMING
WITH TROFING ACROSS EASTERN WYOMING AND THE PANHANDLE. ANOTHER WARM
DAY ON THURSDAY AND THEN SLIGHT COLD AIR ADVECTION INDICATED ON
FRIDAY.  NO WIDESPREAD PRECIPITATION EXPECTED BUT LOOKS LIKE YOU
COULD NOT RULE OUT AFTERNOON AND EVENING CONVECTION THE NEXT TWO
DAYS.

LONG TERM...MODELS DIFFER ON THEIR SOLUTIONS FOR THIS PORTION OF
THE FORECAST...ESPECIALLY FOR NEXT WEEK.  WILL FOLLOW THE 00Z AND
06Z GFS FOR THIS PART OF THE FORECAST BASED ON RUN TO RUN CONTINUITY
AS WELL AS NCEP PREFERENCE.  THE GFS THROUGH THE WEEKEND HAS THE
RIDGE AXIS ALOFT OVER THE NORTHERN ROCKIES WITH AN UPPER LOW MOVING
ACROSS COLORADO THROUGH EARLY SATURDAY NIGHT.  THE 12Z GFS IS SLOWER
THAN ITS PREVIOUS RUNS WITH THE FEATURE.  WITH THE ADDED MOISTURE
AND LIFT...WILL INCREASE POPS AND CLOUD COVER OVER THE CWA...MAINLY
THROUGH SATURDAY NIGHT.  A SHALLOW COLD FRONT ALSO MOVES INTO THE
EAST PART OF THE CWA SATURDAY FROM THE EAST WHICH WILL HAVE AN
IMPACT ON TEMPERATURES AND POPS.  FOR NEXT WEEK...THE RIDGE AXIS
ALOFT REBUILDS BACK TO ALONG THE WEST COAST PER THE 06Z GFS AS A
SHORTWAVE TROUGH MOVES ACROSS SOUTHERN CANADA.  THAT IS WHERE MODEL
DIFFERENCES TAKE PLACE.  THE ECMWF AND DGEX PLACE AN UPPER LEVEL
TROUGH ALONG THE WEST COAST...WITH THE ECMWF THEN MOVING THE
SHORTWAVE INTO THE NORTHERN ROCKIES.  EVEN THE 12Z RUN OF THE GFS
NOW HAS A BROAD UPPER LEVEL TROUGH OVER THE REGION THROUGH TUESDAY
NIGHT WHICH WOULD PRODUCE MORE CLOUDS...PRECIPITATION AND LOWER
MAXIMUM TEMPERATURES.  FOR NOW WILL FOLLOW THE PREVIOUS GFS RUNS
WITH FAIRLY FAST NORTHWEST WIND FLOW ALOFT WILL BE OVER THE
ROCKIES.  BY MIDWEEK...THE 300MB JET WILL BE OVER THE CWA.  A COLD
FRONT BACKS INTO AT LEAST THE EAST PART OF THE CWA ON TUESDAY AND
BECOMES STATIONARY THROUGH WEDNESDAY.  BEHIND THE FRONT...THE GFS
INCREASES THE BOUNDARY LAYER MOISTURE.  FOR NOW WILL LIKELY TREND
CLOUDS AND POPS UP FOR NEXT TUESDAY AND WEDNESDAY.

&&

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

&&

SHORT TERM...GRIFFITH
LONG TERM....WEILAND

Hazardous weather outlook, Sep 6, 9:43 AM MDT, 12 hours 49 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
943 AM MDT WED SEP 6 2006

NEZ001>003-019>021-054-055-WYZ059>070-071545-
SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-
CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON-
SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE-
PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS-
943 AM MDT WED SEP 6 2006

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

.DAY ONE...TODAY AND TONIGHT

A FEW AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE TODAY.
ANY STORMS THAT DEVELOP ARE NOT EXPECTED TO BE SEVERE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A FEW LATE DAY THUNDERSTORMS WILL BE POSSIBLE EACH DAY THURSDAY
THROUGH MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

GRIFFITH

In the hours before

Local storm report, Sep 6, 8:11 PM MDT, 2 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
811 PM MDT WED SEP 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0732 PM     HAIL             13 S CRAWFORD           42.50N 103.41W
09/06/2006  E0.50 INCH       DAWES              NE   TRAINED SPOTTER

&&

SRUBIN

Local storm report, Sep 6, 9:56 PM MDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
956 PM MDT WED SEP 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0940 PM     HAIL             BAYARD                  41.76N 103.32W
09/06/2006  E0.88 INCH       MORRILL            NE   TRAINED SPOTTER

0945 PM     HAIL             BAYARD                  41.76N 103.32W
09/06/2006  E0.75 INCH       MORRILL            NE   STORM CHASER

&&

RUBIN

Local storm report, Sep 6, 9:56 PM MDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
956 PM MDT WED SEP 06 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0940 PM     HAIL             BAYARD                  41.76N 103.32W
09/06/2006  E0.88 INCH       MORRILL            NE   TRAINED SPOTTER

0945 PM     HAIL             BAYARD                  41.76N 103.32W
09/06/2006  E0.75 INCH       MORRILL            NE   STORM CHASER

            HAIL LASTED FROM 0945 PM TO 0953 PM

&&

RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 7:37 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	22 min
Sep 6, 9:45 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	59 min
Sep 7, 3:02 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2006 Every 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.