Drought Information Statement
Issued by NWS Riverton, WY

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AXUS75 KRIW 160433
DGTRIW
WYC003-013-017-019-023-025-029-035-037-039-043-180445-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1033 PM MDT Wed Aug 15 2018

...Drought Conditions Worsen Across Southwest Wyoming...

SYNOPSIS...

Dry and warm conditions over the Summer have led to an increase in
moderate to severe drought across southern and eastern Sweetwater
County. Severe drought (D2) conditions developed over eastern
Sweetwater County on the latest Drought Monitor.  Moderate Drought
(D1) extended across far southern Sweetwater County, and also crept
northward into the southwest corner of Lincoln County. Drought
Abnormally dry conditions (D0) remained across the rest of Sweetwater
County and southern Lincoln County.

The Green and Bear River Basins received a basin-wide average of only
53 percent of the 20th century average in July, and recorded the
10th warmest July over a 125 period. For the current water year
(October 2017-July 2018), basin-wide average precipitation is 86
percent of the 20th century average, and basin-wide average
temperature ranks as the 4th warmest over the last 125 years. These
warm and dry conditions have led to critically dry vegetation this
Summer.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

28 day average streamflows on August 14th for the Little Snake River
Basin and Popo Agie River Basin were much below normal. The Bear
River Basin and portions of the Power River and Shoshone River Basins
were below normal. Near normal to above normal streamflows were
observed across the rest of west and central Wyoming.


FIRE WEATHER IMPACTS...

Most areas across west and central were reporting critically dry
fuels susceptible to rapid fire growth in mid-August. The exceptions
were the Absaroka and Owl Creek/Bridger Mountains, and the east
slopes of the Wind River Mountains.

CLIMATE SUMMARY...

Below are the cumulative precipitation amounts from selected
locations across west and central Wyoming for the current water year
(October 2017-July 2018).

NOTE: Basin-wide percent of averages are based on 20th century
(1901-2000) averages. Specific locations percent of averages are
based on 1981-2000 normals.

LOCATION               PRECIPITATION       % OF AVERAGE
AND DROUGHT            (INCHES)
CONDITION              OCT 2017-JUL 2018
--------               -----------------    ---------

YELLOWSTONE BASIN AVG.    30.86               127
 OLD FAITHFUL             26.78               119

SNAKE BASIN AVG.          34.21               114
  AFTON                   17.05               110
  MOOSE                   28.83               114

GREEN AND BEAR BASIN AVG.  9.98                86
  BIG PINEY AIRPORT        4.74                95
1 EVANSTON AIRPORT         4.07                41
0 FOSSIL BUTTE N.M.        9.83               110
0 GREEN RIVER              8.19               121
0 ROCK SPRINGS (FIRE DP)   5.68                75

BIGHORN BASIN AVG.        14.48               113
  CODY                    11.82               138
  GREYBULL AIRPORT         5.20                84
  POWELL FIELD STATION     5.89               105
  THERMOPOLIS             10.31               104
  WORLAND AIRPORT          6.67               106

POWDER/TONGUE BASIN AVG.  13.63               105
  BUFFALO AIRPORT          9.70                86
  KAYCEE                   9.81                94
  SHERIDAN AIRPORT        14.69               122

LOWER PLATTE BASIN AVG    16.55               138
  CASPER AIRPORT          12.20               115
  CHEYENNE AIRPORT        13.08               105

WIND RIVER BASIN AVG.     14.82               115
  DUBOIS                  12.68               162
  LANDER AIRPORT          13.35               121
  RIVERTON AIRPORT         9.46               119
  RIVERTON (DOWNTOWN)      8.73               123

UPPER PLATTE BASIN AVG.    9.23                83
  JEFFREY CITY             7.66                88
-------------------------------------------------
STATEWIDE AVERAGE         14.49               106

--------------------------------------------
| STATION`S DROUGHT INTENSITY (LEFT COLUMN):|
| 3 - LOCATION IN EXTREME DROUGHT/D3/       |
| 2 - LOCATION IN SEVERE DROUGHT /D2/       |
| 1 - LOCATION IN MODERATE DROUGHT /D1/     |
| 0 - LOCATION ABNORMALLY DRY /D0/          |
|   - NONE                                  |
|                                           |
| (M) MISSING PRECIPITATION DATA IN RECORD  |
--------------------------------------------

PRECIPITATION/TEMPERATURE OUTLOOKS...

An El Nino Watch has been issued for the Fall and Winter 2018-19.
ENSO Neutral conditions are expected to remain across the tropical
Pacific for the rest of the Summer. El Nino conditions have a 60
percent chance of developing in Fall (Sep-Nov 2018), and a 70
percent chance of developing during the Winter (Dec 2018-Feb 2019).

The Fall (September-November) outlook for Wyoming shows and elevated
chance of above normal temperatures across the entire state with the
southwest half of the state having the greatest chance of above
normal temperatures. The precipitation outlook for Fall 2018 shows
equal chances of above normal, below normal or near normal
precipitation across the state, or no clear climate signal.

The seasonal drought outlook through October 31st shows drought
removal is likely across southern Wyoming by the end of October.

HYDROLOGIC SUMMARY AND OUTLOOK...

Reservoir storages across Wyoming were in relatively good condition
for late Summer.

RESERVOIR DATA FOR AUGUST 15TH -

RESERVOIR                  PERCENT FULL

CENTRAL WYOMING
   BOYSEN                      94
   BUFFALO BILL                92
   BULL LAKE                   95
   PATHFINDER                  59

UPPER GREEN RIVER BASIN
   BIG SANDY                   60
   FONTENELLE                  92
   FLAMING GORGE               93

UPPER SNAKE RIVER BASIN
   GRASSY LAKE                 76
   JACKSON LAKE                91

NEXT ISSUANCE DATE...

This product will be updated on or before September 15, 2018.

&&

RELATED WEB SITES...

ADDITIONAL INFORMATION ON CURRENT DROUGHT CONDITIONS MAY BE FOUND AT
THE FOLLOWING WEB ADDRESSES /USE LOWER CASE LETTERS/...

TO REPORT EFFECTS OF THE DROUGHT IN YOUR AREA...PLEASE GO TO THE
DROUGHT IMPACT REPORTER AT...

HTTP://DROUGHTREPORTER.UNL.EDU/

...AND CLICK ON SUBMIT A REPORT.

INFORMATION FOR THE MEDIA MAY BE FOUND AT...

HTTP://DROUGHT.UNL.EDU/NEWSOUTREACH/INFORMATIONFORMEDIA.ASPX

NWS RIVERTON DROUGHT PAGE...
HTTP://WWW.WEATHER.GOV/RIW/DROUGHT

WIND RIVER INDIAN RESERVATION AND SURROUNDING AREA CLIMATE AND
DROUGHT SUMMARIES...

HTTP://REVAMPCLIMATE.COLOSTATE.EDU/REVAMP/PROJECT/WIND-RIVER-
DROUGHT-PREPAREDNESS

USGS WYOMING DROUGHT WATCH...
HTTP://WY.WATER.USGS.GOV/PROJECTS/DROUGHT/

U.S. DROUGHT MONITOR...HTTP://WWW.DROUGHT.GOV

NOAA DROUGHT PAGE...HTTP://WWW.DROUGHT.NOAA.GOV

CLIMATE PREDICTION CENTER /CPC/...HTTP://WWW.CPC.NCEP.NOAA.GOV

ADDITIONAL RIVER AND RESERVOIR INFORMATION...

NWS ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/...
HTTP://WWW.WATER.GOV/AHPS2/INDEX.PHP?WFO=RIW

NRCS WYOMING...HTTP://WWW.WY.NRCS.USDA.GOV

USGS...HTTP://WATER.USGS.GOV/

USBR...HTTP://WWW.USBR.GOV/

WATER RESOURCE DATA SYSTEM (WRDS)...HTTP://WWW.WRDS.UWYO.EDU

ACKNOWLEDGMENTS...

THE DROUGHT MONITOR IS A MULTI-AGENCY EFFORT INVOLVING NOAA/S
NATIONAL WEATHER SERVICE AND NATIONAL CLIMATIC DATA CENTER...THE
USDA...STATE AND REGIONAL CENTER CLIMATOLOGISTS AND THE NATIONAL
DROUGHT MITIGATION CENTER. INFORMATION FOR THIS STATEMENT HAS BEEN
GATHERED FROM NWS AND FAA OBSERVATION SITES...STATE COOPERATIVE
EXTENSION SERVICES...THE USDA...USACE AND USGS.

QUESTIONS OR COMMENTS...

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS DROUGHT INFORMATION
STATEMENT...PLEASE CONTACT...

ARTHUR MEUNIER
DROUGHT FOCAL POINT
NATIONAL WEATHER SERVICE
12744 WEST US HIGHWAY 26
RIVERTON, WY 82501
TELEPHONE...307-857-3898
............800-211-1448
EMAIL...ARTHUR.MEUNIER@NOAA.GOV

$$



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