Alert archive / Nebraska / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 127, NWS Cheyenne, WY

August 22, 2007Kimball County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 22, 2007, 10:33 PM MDT for Kimball County, Nebraska. 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 counties it named.

The facts

Issued: Aug 22, 2007, 10:33 PM MDT (04:33 UTC)
Expired: Aug 22, 2007, 11:30 PM MDT
In force: 57 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Kimball County, NE

The radar

The Cheyenne radar (KCYS), 91 km from the middle of the area, began a volume at 04:35 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 (KDEN), launched 00:00Z, 4.6 hours before the alert went out and 153 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: -128 J/kg
Mixed-layer LCL: 2736 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Aug 22, 3:21 PM MDT, 7 hours 12 minutes earlier.

Area forecast discussion, Aug 22, 3:21 PM MDT, 7 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
321 PM MDT WED AUG 22 2007

.SHORT TERM...THROUGH FRI. WEST SOUTHWESTERLY FLOW ALOFT TONIGHT
WILL BECOME MORE CYCLONIC AND VEER THU AND THU NIGHT IN RESPONSE
TO AN UPPER TROUGH MOVING OVER THE REGION. FLOW ALOFT FRI WILL BE
FROM THE NORTHWEST. AT THE SURFACE...THE THREAT OF SEVERE
THUNDERSTORMS WILL CONTINUE INTO THIS EVENING FROM THE LARAMIE
RANGE EASTWARD. SUFFICIENT INSTABILITY...MOISTURE AND SHEAR EXIST
TO WARRANT A CHANCE OF MARGINALLY SEVERE THUNDERSTORMS. IN
FACT...EXPECT A CHANCE OF THUNDERSTORMS TO CONTINUE OVERNIGHT
TONIGHT. THU SURFACE HIGH PRESSURE WILL MOVE SOUTHWARD OVER THE
FORECAST AREA. THU WILL BE COOLER WITH A CONTINUED CHANCE OF RAIN
AS MOIST LOW LEVEL UPSLOPE FLOW KEEPS PLENTY OF CLOUDS IN THE
AREA. FRI WILL REMAIN ON THE COOL SIDE ALTHOUGH AFTERNOON
TEMPERATURES SHOULD BEGIN TO REBOUND A BIT AS HEIGHTS AND
THICKNESS VALUES BEGIN TO INCREASE. CHANCE OF RAIN WILL PERSIST
FRI ALTHOUGH THE AIRMASS SHOULD BEGIN TO DRY SOMEWHAT FROM WEST
TO EAST FRI AFTERNOON.

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT. AS THE SHORT
WAVE MOVES EAST OF THE CWA...DRY ZONAL FLOW WILL SETUP FOR THE
WEEKEND AND DOWNSLOPE EFFECTS WITH LITTLE LOW LEVEL
MOISTURE...EXPECT A REBOUND IN COOL TEMPERATURES FROM THURSDAY
AND FRIDAY WITH A RETURN TO ABOVE NORMAL READINGS FOR THE WEEKEND.

THE NEXT CHANCE FOR PRECIPITATION WILL BE MONDAY THROUGH
TUESDAY AS A COLD FRONT SLIPS SOUTH ACROSS THE CWA ON
MONDAY...SETTING UP UPSLOPE FLOW WITH INCREASING LOW LEVEL
MOISTURE. A SHORT WAVE WILL MOVE EAST FROM THE PACIFIC NORTHWEST
AND ACROSS THE NORTHERN ROCKIES MONDAY NIGHT WHICH WILL HELP KEEP
ANY PRECIPITATION GOING FOR TUESDAY. RIDGE BUILDS OVER REGION ON
WEDNESDAY WITH A RETURN TO DRY CONDITIONS...BARRING AFTERNOON
CONVECTION OVER THE HIGHER TERRAIN.

&&

.AVIATION...EXPECT SOME SHOWERS AND STORMS THIS AFTERNOON THROUGH
TONIGHT AS MOIST SURFACE UPSLOPE COMBINES WITH UPPER SHORTWAVE
ENERGY TO TRIGGER SOME CONVECTION. LOCALIZED MVFR CONDITIONS WILL BE
POSSIBLE WITH THE STRONGEST STORMS. SOME MVFR CEILINGS ARE EXPECTED
TO DEVELOP TONIGHT...WITH SOME IFR OR LOWER CEILINGS EAST OF THE
LARAMIE RANGE.

&&

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

&&

SHORT TERM/AVIATION...JR
LONG TERM....EISE

Hazardous weather outlook, Aug 22, 10:55 AM MDT, 11 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1055 AM MDT WED AUG 22 2007

NEZ001>003-019>021-054-055-WYZ059-060-064-066>070-231200-
SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-
CHEYENNE-CONVERSE-NIOBRARA-NORTH LARAMIE RANGE-LARAMIE RANGE-
PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS-
1055 AM MDT WED AUG 22 2007

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. SOME OF THE
STORMS COULD BECOME SEVERE WITH THE MAIN THREATS BEING LARGE HAIL
AS WELL AS WIND GUSTS OVER 60 MPH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

WYZ061>063-065-231200-
SOUTHWEST CARBON-NORTH CARBON-SNOWY RANGE-LARAMIE VALLEY-
1055 AM MDT WED AUG 22 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. ANY STORMS
THAT DEVELOP ARE NOT EXPECTED TO BECOME SEVERE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

In the hours before

Local storm report, Aug 22, 7:28 PM MDT, 3 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
728 PM MDT WED AUG 22 2007

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

0715 PM     TSTM WND GST     DOUGLAS                 42.76N 105.39W
08/22/2007  M70.00 MPH       CONVERSE           WY   ASOS

&&

BCHAPMAN

Local storm report, Aug 22, 7:37 PM MDT, 2 hours 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
737 PM MDT WED AUG 22 2007

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

0700 PM     HAIL             15 S BUSHNELL           41.01N 103.89W
08/22/2007  E1.75 INCH       KIMBALL            NE   NWS EMPLOYEE

            SOME HAIL STONES TO 21/4 INCH.

0710 PM     TSTM WND GST     12 NW DOUGLAS           42.88N 105.56W
08/22/2007  E60 MPH          CONVERSE           WY   TRAINED SPOTTER

            DIME SIZED HAIL ALSO

0713 PM     HAIL             14 SE BUSHNELL          41.09N 103.70W
08/22/2007  E0.75 INCH       KIMBALL            NE   TRAINED SPOTTER

            HEAVY RAIN

0716 PM     HAIL             15 SW KIMBALL           41.08N 103.86W
08/22/2007  M0.88 INCH       KIMBALL            NE   TRAINED SPOTTER

            ONE HALF INCH OF RAIN.

&&

BCHAPMAN

Special weather statement, Aug 22, 8:34 PM MDT, 1 hour 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
834 PM MDT WED AUG 22 2007

WYZ067>069-230345-
PLATTE-GOSHEN-CHEYENNE FOOTHILLS-
INCLUDING THE CITIES OF...WHEATLAND...GUERNSEY...TORRINGTON...
CHEYENNE
834 PM MDT WED AUG 22 2007

...MORE LINES OF THUNDERSTORMS MOVING ACROSS SOUTHEAST WYOMING...

THUNDERSTORMS HAVE BEEN RAPIDLY DEVELOPING OVER PLATTE COUNTY AND
THE NORTHWEST PART OF LARAMIE COUNTY SINCE 815 PM MDT.  THESE STORMS
WILL AFFECT MOST OF PLATTE AND GOSHEN COUNTIES AND THE NORTHWEST
HALF OF LARAMIE COUNTY THROUGH 940 PM. HEAVY RAIN OVER AN INCH...
GUSTY WINDS NEAR 50 MPH AND DEADLY LIGHTNING WILL ACCOMPANY THESE
THUNDERSTORMS AS THEY MOVE EAST AT 30 MPH. SMALL HAIL IS ALSO
LIKELY WITH A FEW OF THE THUNDERSTORMS.

JLH

Local storm report, Aug 22, 8:50 PM MDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
850 PM MDT WED AUG 22 2007

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

0735 PM     TSTM WND GST     LANCE CREEK             43.02N 104.64W
08/22/2007  E50 MPH          NIOBRARA           WY   TRAINED SPOTTER

            3/4 TO 1 INCH RAIN PEA SIZED HAIL.

0755 PM     TSTM WND GST     11 NE LANCE CREEK       43.13N 104.49W
08/22/2007  E50 MPH          NIOBRARA           WY   TRAINED SPOTTER

            POSSIBLY 60 MPH GUST

0812 PM     TSTM WND GST     32 NNE LUSK             43.19N 104.21W
08/22/2007  E70 MPH          NIOBRARA           WY   TRAINED SPOTTER

            WIND GUST OF 60 TO 70 PMH. HEAVY RAIN.

&&

BCHAPMAN

Local storm report, Aug 22, 10:31 PM MDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1031 PM MDT WED AUG 22 2007

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

0955 PM     TSTM WND GST     4 E CHUGWATER           41.76N 104.74W
08/22/2007  E54 MPH          PLATTE             WY   TRAINED SPOTTER

1005 PM     HAIL             9 S CHEYENNE            41.02N 104.79W
08/22/2007  E0.75 INCH       LARAMIE            WY   PUBLIC

1009 PM     HAIL             4 W CHEYENNE            41.15N 104.87W
08/22/2007  E1.00 INCH       LARAMIE            WY   TRAINED SPOTTER

0845 PM     HAIL             1 N FEDERAL             41.28N 105.10W
08/22/2007  E0.88 INCH       LARAMIE            WY   TRAINED SPOTTER

0848 PM     HAIL             11 SE HORSE CREEK       41.30N 105.03W
08/22/2007  E1.00 INCH       LARAMIE            WY   TRAINED SPOTTER

0851 PM     HAIL             2 E CARPENTER           41.03N 104.30W
08/22/2007  E1.00 INCH       LARAMIE            WY   TRAINED SPOTTER

0853 PM     HAIL             12 SSE HORSE CREEK      41.25N 105.09W
08/22/2007  E0.75 INCH       LARAMIE            WY   PUBLIC

0922 PM     HAIL             4 N CHEYENNE            41.20N 104.79W
08/22/2007  M1.00 INCH       LARAMIE            WY   TRAINED SPOTTER

0924 PM     HAIL             CHEYENNE                41.15N 104.79W
08/22/2007  E0.88 INCH       LARAMIE            WY   PUBLIC

            NUMEROUS REPORTS OF HAIL FROM 14 INCH TO ONE INCH AROUND
            THE CITY. ALSO MANY REPORTS OF MINOR STREET FLOODING.

1030 PM     HEAVY RAIN       CHUGWATER               41.76N 104.82W
08/22/2007  M1.23 INCH       PLATTE             WY   CO-OP OBSERVER

&&

BCHAPMAN

Local storm report, Aug 22, 10:33 PM MDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1033 PM MDT WED AUG 22 2007

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

0926 PM     TSTM WND GST     CHADRON                 42.83N 103.00W
08/22/2007  M71 MPH          DAWES              NE   ASOS

0953 PM     TSTM WND GST     CHADRON                 42.83N 103.00W
08/22/2007  M70 MPH          DAWES              NE   ASOS

&&

BCHAPMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 6:56 PM MDT	Severe Thunderstorm Warning	CYS	Converse	64 min
Aug 22, 7:58 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	33 min
Aug 22, 8:49 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	56 min
Aug 22, 9:42 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	63 min
Aug 22, 9:57 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	63 min
Aug 22, 10:04 PM MDT	Flash Flood Warning	CYS	Laramie	116 min
Aug 22, 7:04 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	41 min
Aug 22, 9:32 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	28 min
Aug 22, 9:35 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	55 min
Aug 22, 10:53 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	67 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2007 Every severe thunderstorm warning in 2007

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.