Alert archive / Nebraska / Special Weather Statements in 2013

Special Weather Statement, NWS Cheyenne, WY

August 4, 2013Morrill County, Nebraska

NWS Cheyenne, WY issued this special weather statement at Aug 4, 2013, 8:16 PM MDT for Morrill County, Nebraska. It was in force for 59 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
Aug 4, 2013, 8:16 PM MDT (02:16 UTC)
Expired
Aug 4, 2013, 9:15 PM MDT
In force
59 min
Issued by
NWS Cheyenne, WY

County Morrill County, NE

The radar

The North Platte radar (KLNX), 181 km from the middle of the area, began a volume at 02:18 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 (KRAP), launched 00:00Z, 2.3 hours before the alert went out and 266 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, Rapid City, SD at 00:00Z on 2013-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 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, Rapid City, SD at 00:00Z on 2013-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -73 square meters per square second.1939587897Sfc1 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
352 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
2206 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-73 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 4, 6:27 PM MDT, 1 hour 49 minutes earlier.

Area forecast discussion, Aug 4, 6:27 PM MDT, 1 hour 49 minutes before
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Hazardous weather outlook, Aug 4, 6:10 PM MDT, 2 hours 6 minutes before
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In the hours before

Local storm report, Aug 4, 3:36 PM MDT, 4 hours 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
336 PM MDT SUN AUG 04 2013

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

0326 PM     HAIL             3 SE CHEYENNE           41.11N 104.75W
08/04/2013  E1.75 INCH       LARAMIE            WY   NWS EMPLOYEE

0315 PM     HAIL             2 SE CHEYENNE           41.12N 104.76W
08/04/2013  E1.50 INCH       LARAMIE            WY   PUBLIC

0326 PM     HAIL             5 SE CHEYENNE           41.09N 104.72W
08/04/2013  E1.00 INCH       LARAMIE            WY   TRAINED SPOTTER

0320 PM     HAIL             2 E CHEYENNE            41.15N 104.75W
08/04/2013  E0.50 INCH       LARAMIE            WY   COCORAHS

&&

BCHAPMAN
Local storm report, Aug 4, 3:50 PM MDT, 4 hours 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
350 PM MDT SUN AUG 04 2013

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

0325 PM     HAIL             5 SE CHEYENNE           41.09N 104.72W
08/04/2013  E0.50 INCH       LARAMIE            WY   PUBLIC

            SOME HAIL A LITTLE LARGER. 1.25 INCH OF RAIN.

&&

BCHAPMAN
Special weather statement, Aug 4, 5:38 PM MDT, 2 hours 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
538 PM MDT SUN AUG 4 2013

NEZ096-050045-
SOUTH SIOUX NE-
538 PM MDT SUN AUG 4 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SIOUX COUNTY UNTIL
645 PM MDT...

AT 536 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES SOUTHWEST OF WATSON RANCH...OR 19 MILES
NORTH OF SCOTTSBLUFF...MOVING EAST AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
RURAL SOUTHERN SIOUX COUNTY THROUGH 645 PM MDT
RURAL SOUTHEASTERN SIOUX COUNTY THROUGH 645 PM MDT

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 4221 10345 4201 10348 4211 10382 4220 10379
TIME...MOT...LOC 2339Z 281DEG 11KT 4213 10373

RUBIN
Special weather statement, Aug 4, 5:49 PM MDT, 2 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
549 PM MDT SUN AUG 4 2013

WYZ106>108-050045-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY-EAST PLATTE
COUNTY WY-GOSHEN COUNTY WY-
549 PM MDT SUN AUG 4 2013

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN PLATTE AND CENTRAL GOSHEN
COUNTIES UNTIL 645 PM MDT...

AT 546 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WHEATLAND...MOVING EAST AT 35 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
GRAYROCKS RESERVOIR AROUND 605 PM MDT.
FORT LARAMIE NATIONAL HISTORIC SITE AROUND 620 PM MDT.
FORT LARAMIE AROUND 625 PM MDT.
LINGLE AROUND 635 PM MDT.

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 76 AND
84.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 4235 10424 4204 10418 4200 10499 4212 10502
TIME...MOT...LOC 2349Z 255DEG 32KT 4207 10490

RUBIN
Special weather statement, Aug 4, 7:40 PM MDT, 36 minutes before
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Special weather statement, Aug 4, 8:16 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 2:28 PM MDTSpecial Weather StatementCYSLaramie32 min
Aug 5, 2:30 PM MDTSpecial Weather StatementCYSLaramie30 min
Aug 4, 7:40 PM MDTSpecial Weather StatementCYSMorrill65 min

Nearby

Special Weather Statements in Nebraska, 2013Every special weather statement in 2013

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.