Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Cheyenne, WY

April 10, 2016Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Apr 10, 2016, 3:49 PM MDT for Laramie County, Wyoming. It was in force for 41 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: Apr 10, 2016, 3:49 PM MDT (21:49 UTC)
Expired: Apr 10, 2016, 4:30 PM MDT
In force: 41 min
Issued by: NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 35 km from the middle of the area, began a volume at 21:52 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 text

As transmitted.

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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 Apr 10, 3:32 PM MDT, 17 minutes earlier.

Area forecast discussion, Apr 10, 3:32 PM MDT, 17 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
332 PM MDT SUN APR 10 2016

.SHORT TERM...(THIS EVENING THROUGH TUESDAY)
ISSUED AT 332 PM MDT SUN APR 10 2016

THE COLD FRONT IS STEADILY MOVING THROUGH THE HIGH COUNTRY THIS
AFTERNOON WITH NORTH WINDS NOW OBSERVED AT RAWLINS AND
ARLINGTON. IT APPEARS THE FRONT IS RIGHT AT LARAMIE'S
DOORSTEP...BUT NOT QUITE AT VEDAUWOO OR OTHER SPOTS IN THE
SOUTHERN LARAMIE RANGE. THUS...THE FORECAST FOR TODAY AND TONIGHT
SEEMS TO BE ON TRACK SINCE THE EARLIER UPDATE.

LOOKING TOWARDS TOMORROW...SFC HIGH PRESSURE WILL BUILD INTO THE
CENTRAL PLAINS WHILE WINDS ALOFT WEAKEN THROUGH THE DAY AS AN
UPPER LEVEL RIDGE MOVES OVER THE ROCKIES. SFC WINDS ACROSS OUR
FORECAST AREA WILL RESPOND BY VEERING TO THE SOUTH-SOUTHEAST
ACROSS THE PLAINS...ADVECTING IN LLVL MOISTURE WITHIN UPSLOPE
FLOW. THE COLD FRONT LOOKS TO RETREAT EASTWARD THROUGH THE
EVENING AND OVERNIGHT PERIOD AS HEIGHTS BUILD ALOFT...MEANING THAT
SFC WINDS WILL THEN SHIFT TO THE WEST-SOUTHWEST IN ITS WAKE. TEMPS
OVERALL WILL SLOWLY WARM IN THE AFTERNOON AS HEIGHTS RISE. THE
COMBINATION OF INCREASINGLY MOIST UPSLOPE SLOW AND CONVERGENCE
ALONG THE RETREATING FRONT WILL BRING A CHANCE FOR SHOWERS AND
THUNDERSTORMS IN THE AFTERNOON MAINLY TO THE HIGHER TERRAIN ALONG
AND WEST OF I-25.

BREEZY WESTERLY WINDS AND MUCH WARMER TEMPS WILL RETURN FOR
TUESDAY IN THE WAKE OF THE FRONT AND AS AN UPPER LEVEL TROUGH
SLIDES ACROSS THE US/CANADIAN BORDER. GFS AND NAM HINT AT
LI'S DROPPING TO AROUND MINUS 2 IN THE AFTERNOON ALONG AND WEST
OF I-25...SO ONCE AGAIN EXPECT AFTERNOON SHOWERS AND T-STORMS TO
DEVELOP.

.LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 332 PM MDT SUN APR 10 2016

LINGERING SHOWERS POSSIBLE MAINLY OVER SE WY TUESDAY EVENING
OTHERWISE MAINLY DRY AS A SHORT UPPER RIDGE MOVES ACROSS THE AREA
THROUGH EARLY WEDS. SOUTHWESTERLY UPPER FLOW SETS UP ACROSS THE
CWA WEDS AHEAD OF AN UPPER LOW THAT WILL BE NEARING THE PACIFIC NW
COAST WITH INCREASING MOISTURE ALLOWING FOR SOME SHOWERS AND MAYBE
A FEW STORMS PRIMARILY ACROSS THE MTNS INTO WEDS EVENING. SIMILAR
PATTERN FOR THURSDAY WITH MILD TEMPERATURES AND SCTD SHOWERS AND A
FEW STORMS THURSDAY AFTERNOON AND EVENING AS THE UPPER LOW MOVES
INTO THE WESTERN CONUS. FRIDAY THROUGH SUNDAY LOOKING RATHER WET
AS MODELS DROP THE UPPER LOW INTO THE FOUR CORNERS AREA FRIDAY
THEN CUT IT OFF IN THAT SAME GENERAL AREA SATURDAY THROUGH SUNDAY.
AT THE SAME TIME COOLER AIR PUSHES SOUTHWARD ACROSS THE CWA
SETTING UP A NICE UPSLOPE PATTERN FOR GENERAL RAIN AND SNOW ACROSS
THE CWA. SNOW LEVELS WILL BE TRICKY AS NOT A LOT OF COLD AIR.
WILL HAVE TO SEE HOW THIS EVOLVES AS IT LOOKING LIKE ONE OF THOSE
GOOD APRIL RAIN/SNOW MAKERS FOR THE CWA.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY MORNING)
ISSUED AT 1122 AM MDT SUN APR 10 2016

VFR EXPECTED THROUGH THE PERIOD FOR THE NEB PANHANDLE TERMINALS WITH
SOME SHOWERS MAINLY OVER THE SOUTHERN PARTS THIS AFTERNOON AND
EVENING.  EXPECT CIGS TO LOWER TO MVFR/IFR FROM KRWL TO KCYS THIS
AFTERNOON AND CONTINUE TONIGHT WITH MORE NUMEROUS SHOWERS AIDED BY
UPSLOPE FLOW BEHIND COLD FRONT.

&&

.FIRE WEATHER...
ISSUED AT 332 PM MDT SUN APR 10 2016

WIDESPREAD RAIN SHOWERS AND HIGH ELEVATION SNOW WILL CONTINUE
THROUGH TONIGHT...WITH SOME SNOW MIXING DOWN TO ABOUT 6000 FEET
LATE TONIGHT MAINLY NEAR THE COLORADO BORDER. WARMER AND DRIER
WEATHER WILL RETURN FOR MONDAY AND TUESDAY WITH AFTERNOON SHOWERS
AND T-STORMS POSSIBLE OVER THE HIGH COUNTRY BOTH DAYS.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...WINTER WEATHER ADVISORY UNTIL 6 AM MDT MONDAY FOR WYZ112-114.

NE...NONE.
&&

SHORT TERM...RJM
LONG TERM...RE
AVIATION...RE
FIRE WEATHER...RJM

Hazardous weather outlook, Apr 10, 3:39 PM MDT, 10 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
339 PM MDT SUN APR 10 2016

WYZ101>119-112145-
CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY-
NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS-
SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY-
NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY-
SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-
LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
339 PM MDT SUN APR 10 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL
WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED THUNDERSTORMS ARE POSSIBLE THROUGH EARLY THIS EVENING
MAINLY ALONG AND WEST OF INTERSTATE 25. SNOW WILL BECOME MODERATE
AT TIMES IN THE SNOWY AND SIERRA MADRE MOUNTAINS THIS EVENING
THROUGH TONIGHT...WITH ABOUT 4 TO 8 INCHES OF ACCUMULATION
POSSIBLE THROUGH THIS TIME. SNOW COULD MIX DOWN TO 6000 FEET
OVERNIGHT...BUT LITTLE TO NO ACCUMULATION IS EXPECTED OUTSIDE OF
THE MOUNTAINS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ISOLATED THUNDERSTORMS ARE POSSIBLE IN THE HIGH COUNTRY ON MONDAY
AND TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

NEZ002-003-019>021-054-055-095-096-112145-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-
339 PM MDT SUN APR 10 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF PANHANDLE
NEBRASKA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Apr 10, 3:49 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
349 PM MDT SUN APR 10 2016

WYZ116-117-102230-
SOUTH LARAMIE RANGE WY-SOUTH LARAMIE RANGE FOOTHILLS WY-
349 PM MDT SUN APR 10 2016

...SPECIAL WEATHER STATEMENT...

AT 349 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
CRYSTAL LAKE CAMPGROUND...OR 22 MILES WEST OF CHEYENNE...MOVING
NORTHEAST AT 35 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GRANITE SPRINGS CAMPGROUND...CRYSTAL LAKE CAMPGROUND...VEDAUWOO
CAMPGROUND...CRYSTAL LAKE RESERVOIR...FEDERAL...VEDAUWOO...BUFORD AND
GRANITE SPRINGS RESERVOIR.

THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 329 AND
353.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4117 10541 4129 10504 4101 10493 4099 10515
      4100 10536
TIME...MOT...LOC 2149Z 236DEG 30KT 4110 10522

TJT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 11:39 AM MDT	Winter Weather Advisory	CYS	Albany, Carbon	16 hr

Nearby

Special Weather Statements in Wyoming, 2016 Every special weather statement in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.