Flash Flood Warning 6, NWS Cheyenne, WY

438 
WGUS55 KCYS 270507
FFWCYS
WYC031-271230-
/O.EXT.KCYS.FF.W.0006.000000T0000Z-190527T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
1107 PM MDT Sun May 26 2019

...FLASH FLOOD EMERGENCY FOR CHUGWATER CREEK IN PLATTE COUNTY 
WYOMING INCLUDING THE TOWN OF CHUGWATER...

The National Weather Service in Cheyenne has extended the

* Flash Flood Warning for...
  South central Platte County in southeastern Wyoming...

* Until 630 AM MDT Monday.

* At 1102 PM MDT, emergency management reported 5 feet of water 
  overflowing a bridge on Happy Hollow Road in Chugwater along 
  Chugwater Creek. Flash Flooding is ongoing. 

* This is a FLASH FLOOD EMERGENCY for Chugwater area and points 
  northeast along Chugwater Creek towards the Laramie River east of 
  Wheatland. 

* This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

* Some locations that will experience flooding include...
  Chugwater, Chugcreek, Y-O Ranch and Slater. 

 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4214 10485 4213 10482 4201 10491 4193 10482
      4179 10477 4174 10478 4175 10486 4178 10481
      4193 10487 4199 10496

$$

Trudel

Area Forecast Discussion
National Weather Service Cheyenne WY
527 PM MDT Sun May 26 2019

.SHORT TERM...(This evening through Tuesday night)
Issued at 230 PM MDT Sun May 26 2019

Forecast concerns in the short term deal with severe
storms...heavy rain leading to possible flooding/flash flooding
and heavy mountain snow.

Currently...surface low analyzed pretty much over Cheyenne this
afternoon. Stratus layer has hung tough over the Panhandle and
hear at Cheyenne so far...limiting convection. Outside of the
convection up in Platte and Converse Counties though... storms are
firing and moving northeast. Latest SPC Meso Analysis up that way
showing an uncapped environment with surface based CAPE around
3000 J/Kg. Southern Panhandle still capped with 50 to 75 J/Kg
inhibition.

Latest HRRR guidance showing storms developing fairly widespread
after 21Z with cap breaking over the southern Panhandle after that
time. Line of thunderstorms form just west of Cheyenne and moves
east with increasing intensity on storms. Storms will be moving
into very unstable environment with meso analysis page showing
3000 J/Kg over the southern Panhandle after 00Z. Severe
thunderstorm threat begins to ease after 02Z.

Went with a Flash Flood Watch for the central
Panhandle...Goshen...eastern Laramie County and eastern Platte
County as a rather large area of moderate to heavy precip remains
in place over the area overnight. Storm motions decrease
significantly tonight...so we will be dealing with slow motions
with storms producing heavy rainfall over these areas. Dangerous
night time flooding is possible.

Guidance continues to show widespread heavy rainfall over the
Laramie Range and points east Monday into Tuesday with 6 hour QPF
forecasts of .75 inches through at least Tuesday afternoon. SO
kept Flood Watch for our northern zones going and even extended
them into Wednesday morning before precip ends.

One final issue...getting some pretty high snow amounts in the
Snowy and Sierra Madre Ranges. 12-24 inches of snow possible for
these ranges before snow ends Wednesday morning. Decided to issue
a Winter Storm Watch for these zones as a result.

.LONG TERM...(Wednesday through Sunday)
Issued at 230 PM MDT Sun May 26 2019

Wednesday...A bit warmer as the airmass moderates and we see some
more sunshine. With the upper trough over South Dakota and wrap
around moisture, we will still see a slight chance of showers and
thunderstorms over our northern counties.

Thursday...Drier and warmer conditions expected as weak shortwave
ridging builds overhead, though there will still be enough residual
low and mid level moisture for some showers and thunderstorms over
the Snowy and Sierra Madre Ranges in the afternoon.

Friday...Ridging aloft flattens somewhat as the next weak shortwave
trough aloft approaches from the Great Basin states. With some
increase in low and mid level moisture, we anticipate an increase in
afternoon shower and thunderstorm coverage over the Snowy, Sierra
Madre and Southern Laramie Ranges.

Saturday...Despite some ridging aloft, there will still be enough
residual low and mid level moisture for isolated to scattered
afternoon and evening showers and thunderstorms. Slightly cooler
with more cloud cover and better coverage of showers and
thunderstorms.

Sunday...Best low and mid level moisture is progged to be over our
eastern counties, where scattered late day showers and thunderstorms
will develop along and east of the low level surface trough axis
along the Interstate 25 corridor.

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 521 PM MDT Sun May 26 2019

Wyoming TAFS...VFR at Rawlins with thunderstorms in the vicinity
until 02Z. Wind gusts to 25 knots until 02Z.

VFR at Laramie with occasional thunderstorms and MVFR until 02Z
with wind gusts to 35 knots.

VFR at Cheyenne, with occasional MVFR until 02Z in thunderstorms,
with wind gusts to 45 knots. Becoming IFR from 08Z to 15Z, then
VFR.

Nebraska TAFS...Occasional MVFR in thunderstorms at Chadron with
gusts to 35 knots until 03Z, then VFR until 08Z, then IFR until
15Z, then VFR.

IFR at Alliance until 03Z, with occasional thunderstorms producing
MVFR and wind gusts to 35 knots, then VFR from 03Z to 08Z, then
IFR until 15Z, then VFR.

Occasional MVFR at Scottsbluff until 03Z with occasional
thunderstorms producing MVFR and wind gusts to 35 knots, then VFR
until 08Z, then IFR until 15Z, then VFR.

Occasional MVFR at Sidney until 03Z, with thunderstorms producing
wind gusts to 35 knots, then VFR from 04Z to 07Z, then IFR until
15Z, then VFR.

&&

.FIRE WEATHER...
Issued at 425 AM MDT Sun May 26 2019

Recent precipitation across southeast Wyoming and the western
Nebraska Panhandle will continue the low fire weather concerns.
Continued unsettled weather will bring near daily chances for
showers and thunderstorms as the cool and wet pattern progresses
on for the near-future. The driest day in the forecast looks to be
today with afternoon humidities reaching down into the
upper teens to low 20s west of the Laramie Range. Gusts will reach
up to 20 mph; stronger near and around thunderstorms

&&

.HYDROLOGY...
Issued at 425 AM MDT Sun May 26 2019

With the recent wet, heavy snowfall across the area, reports have
area streams and creeks at bankfull with portions of the White
River flooding nearby pastureland near Hwy 385. The White River
sensor at the NE/SD border has been slowly declining, however, the
continued wet pattern and snowmelt will likely not ease the flood
risk or water levels for the next several days. A Flood Advisory
remains in effect to accommodate these concerns. Biggest concern
going forward will be the possibility of rain on snow from the
mountain ranges to the Pine Ridge in NE. Depending on rates and
intensity, further flooding concerns remain for rapid rises in
area rivers and streams besides the White River, and other low-
lying areas.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Flood Watch through late Tuesday night for WYZ102.

     Flash Flood Watch through Monday afternoon for WYZ107-108-119.

     Flood Watch from Monday afternoon through Tuesday afternoon for
     WYZ101.

     Winter Storm Watch from Monday evening through late Tuesday
     night for WYZ112-114.

NE...Flood Watch through late Tuesday night for NEZ002-003-095-096.

     Flash Flood Watch through Monday afternoon for NEZ019>021-054-
     055.

&&

SHORT TERM...GCC
LONG TERM...RUBIN
AVIATION...RUBIN
FIRE WEATHER...GCC
HYDROLOGY...AB

Hazardous Weather Outlook
National Weather Service Cheyenne WY
533 AM MDT Sun May 26 2019

WYZ103>106-109>117-271145-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte 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-
533 AM MDT Sun May 26 2019

This hazardous weather outlook is for portions of south central
Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

A few strong thunderstorms may develop this afternoon and
evening. The possibility for severe thunderstorms exists mainly
along and east of Interstate 25.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Heavy rain amounts are expected Monday and Tuesday, mainly along
and east of the Laramie Range. Looking for additional heavy
accumulating snow for the Snowy and Sierra Madre Ranges.

.Spotter information statement...

Spotter activation will not be needed.

NEZ002-095-WYZ101-102-107-271145-
Dawes-North Sioux-Converse County Lower Elevations-
Niobrara County-East Platte County-
533 AM MDT Sun May 26 2019

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Thunderstorms are expected this afternoon and evening with
isolated severe thunderstorms. Main threats from the severe
thunderstorms will be damaging winds and large hail.

A Flood Advisory continues until 900 PM Monday for the White River
in north central Dawes County in the northern Nebraska Panhandle.

A Flood Watch is in effect from Sunday night through Tuesday
afternoon. Scattered thunderstorms will develop, with some storms
possibly producing locally heavy rainfall.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

The Flood Watch continues into Tuesday as heavy rainfall
continues to impact the area.

.Spotter information statement...

Spotter activation will not be needed.

NEZ003-019>021-054-055-096-WYZ108-118-119-271145-
Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
South Sioux-Goshen County-Central Laramie County-
East Laramie County-
533 AM MDT Sun May 26 2019

This hazardous weather outlook is for portions of western
Nebraska and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Strong to severe thunderstorms are possible this afternoon and
evening through around midnight. Threats include large hail,
damaging winds, heavy rainfall and a few tornadoes. The main
threat will be along and south of a Cheyenne-Scottsbluff-Alliance
line.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Severe thunderstorms and heavy rain are expected Monday, with the
threat of heavy rain continuing into Tuesday. Monday's severe
thunderstorms will carry the threat of damaging winds, large hail
and heavy rainfall.

.Spotter information statement...

Spotter activation may be needed along and south of a Cheyenne-
Scottsbluff-Alliance line after 3 PM today through midnight.

Special Weather Statement
National Weather Service Cheyenne WY
638 PM MDT Sun May 26 2019

NEZ020-054-055-270115-
Kimball NE-Cheyenne NE-Banner NE-
638 PM MDT Sun May 26 2019

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CHEYENNE...CENTRAL
KIMBALL AND SOUTHEASTERN BANNER COUNTIES UNTIL 715 PM MDT...

At 637 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles south of Dix, or 13 miles southeast of Kimball, moving
northwest at 25 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Kimball, Dix, Oliver Campground, Oliver Reservoir, Kimball Airport
and Bushnell.

This includes Interstate 80 in Nebraska between mile markers 7 and
32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4122 10397 4144 10361 4108 10331 4100 10347
      4100 10370
TIME...MOT...LOC 0037Z 138DEG 24KT 4107 10350

Trudel

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
641 PM MDT SUN MAY 26 2019

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

0520 PM     HAIL             5 E CHEYENNE            41.15N 104.70W
05/26/2019  E4.25 INCH       LARAMIE            WY   PUBLIC

&&

RCOX

Special Weather Statement
National Weather Service Cheyenne WY
708 PM MDT Sun May 26 2019

WYZ106>108-118-270200-
East Platte County WY-
Central Laramie Range and Southwest Platte County WY-
Goshen County WY-Central Laramie County WY-
708 PM MDT Sun May 26 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GOSHEN...NORTHERN
LARAMIE AND SOUTHEASTERN PLATTE COUNTIES UNTIL 800 PM MDT...

At 708 PM MDT, Doppler radar was tracking a strong thunderstorm over
Chugwater, or 23 miles southeast of Wheatland, moving southeast at 10
mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Chugwater and Slater.

This includes Interstate 25 in Wyoming between mile markers 50 and
59.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4178 10487 4182 10479 4167 10448 4154 10476
TIME...MOT...LOC 0108Z 324DEG 7KT 4174 10479

Worley

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
715 PM MDT SUN MAY 26 2019

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

0705 PM     FLASH FLOOD      CHUGWATER               41.76N 104.82W
05/26/2019                   PLATTE             WY   COUNTY OFFICIAL

            UP TO ONE FOOT OF WATER REPORTED IN DOWNTOWN CHUGWATER.

&&

TTRUDEL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
730 PM MDT SUN MAY 26 2019

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

0727 PM     FLASH FLOOD      3 SSE BORDEAUX          41.91N 104.93W
05/26/2019                   PLATTE             WY   COUNTY OFFICIAL

            VIDEO OF WATER FLOWING OVER INTERSTATE 25 MILE MARKER 69
            NORTHWEST OF CHUGWATER.

&&

TTRUDEL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
736 PM MDT SUN MAY 26 2019

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

0735 PM     FLASH FLOOD      CHUGWATER               41.76N 104.82W
05/26/2019                   PLATTE             WY   EMERGENCY MNGR

            EMERGENCY MANAGEMENT IN PLATTE COUNTY REPORTING CHUGWATER
            CREEK IS FLOODING.

&&

TTRUDEL