260
FGUS63 KKRF 262010
ESPBGH
LONG RANGE PROBABILISTIC OUTLOOK
NATIONAL WEATHER SERVICE
MISSOURI BASIN RIVER FORECAST CENTER PLEASANT HILL MO
217 PM CDT TUE MAY 26 2026
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**** THESE 90 DAY FORECASTS ARE PRODUCED WITH HEFS ****
**** AND COMPARE TO TRADITIONAL ESP AND HISTORICAL ****
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IN TABLE 1 BELOW...THE CURRENT ESP, HEFS, AND HISTORICAL (HS) OR
NORMAL PROBABILITIES OF EXCEEDING MINOR...MODERATE...AND MAJOR
FLOODSTAGES ARE LISTED FOR THE VALID TIME PERIOD.
HEFS VALUES INDICATE THE HEFS PROBABILITY OF REACHING A FLOOD
CATEGORY BASED ON CURRENT CONDITIONS.
ESP VALUES INDICATE THE ESP PROBABILITY OF REACHING A FLOOD
CATEGORY BASED ON CURRENT CONDITIONS.
HS VALUES INDICATE THE PROBABILITY OF REACHING A FLOOD CATEGORY
BASED ON HISTORICAL OR NORMAL CONDITIONS.
WHEN THE VALUE OF ESP OR HEFS IS MORE THAN HS...THE PROBABILITY OF
EXCEEDING THAT LEVEL IS HIGHER THAN NORMAL. WHEN THE VALUE OF ESP
OR HEFS IS LESS THAN HS...THE PROBABILITY OF EXCEEDING THAT LEVEL
IS LOWER THAN NORMAL.
:...TABLE 1--PROBABILITIES FOR MINOR...MODERATE AND MAJOR FLOODING...
VALID PERIOD: 05/31/2026 - 08/29/2026
: CURRENT AND HISTORICAL CHANCES
: OF EXCEEDING FLOOD CATEGORIES
: AS A PERCENTAGE(%)
CATEGORICAL :
FLOOD STAGES (FT) : MINOR MODERATE MAJOR
LOCATION MINOR MOD MAJOR | HEFS ESP HS |HEFS ESP HS |HEFS ESP HS
-------- ----- ----- ----- : ---- ---- ---- ---- ---- ---- ---- ---- ----
:WIND R AT DUBOIS WY 6NW
DUBW4 5.0 5.5 6.0 | <5 <5 22 | <5 <5 12 | <5 <5 6
:WIND R ABV RED CR AT DUBOIS WY 12SE
WRCW4 9.5 10.0 10.5 | <5 <5 <5 | <5 <5 <5 | <5 <5 <5
:WIND R AT CROWHEART WY 10SE
CROW4 10.0 10.5 11.0 | <5 <5 <5 | <5 <5 <5 | <5 <5 <5
:WIND R AT RIVERTON WY 20NW
KINW4 9.0 10.0 11.0 | <5 <5 9 | <5 <5 <5 | <5 <5 <5
:WIND R AT RIVERTON WY 1SE
WDRW4 9.0 11.0 12.0 | <5 <5 23 | <5 <5 8 | <5 <5 <5
:LITTLE WIND R AT RIVERTON WY 2SE
RVTW4 8.0 10.0 11.0 | <5 <5 13 | <5 <5 <5 | <5 <5 <5
:BIGHORN R AT BASIN WY
BHBW4 10.5 11.0 13.0 | <5 <5 9 | <5 <5 6 | <5 <5 <5
:BIGHORN R AT GREYBULL WY
GYBW4 92.0 93.5 95.0 | <5 <5 6 | <5 <5 <5 | <5 <5 <5
:N FK SHOSHONE R AT WAPITI WY
NFSW4 8.0 9.0 10.0 | 5 5 14 | <5 <5 6 | <5 <5 <5
:S FK SHOSHONE R AT BUFFALO BILL WY ABV
BBRW4 9.5 10.5 12.0 | <5 <5 6 | <5 <5 <5 | <5 <5 <5
:SHOSHONE R AT LOVELL WY 2W
SLOW4 11.0 11.5 12.0 | <5 <5 21 | <5 <5 20 | <5 <5 13
LEGEND
HEFS = HYDROLOGIC ENSEMBLE FORECAST SERVICE SIMULATION (CURRENT)
ESP = CONDITIONAL ESP SIMULATION (CURRENT)
HS = HISTORICAL SIMULATION
FT = FEET
IN TABLE 2 BELOW...THE 95 THROUGH 5 PERCENT COLUMNS INDICATE THE HEFS
PROBABILITY OF EXCEEDING THE LISTED STAGE LEVELS FOR THE VALID TIME
PERIOD.
:...TABLE 2--HEFS EXCEEDANCE PROBABILITIES...
.B KRF 0531 Z DH12 /DC2605261917/DVD90/HGVFPXT/HGVFPX9/HGVFPXH
.B1 /HGVFPX5/HGVFPXG/HGVFPX1/HGVFPXF
: CHANCE OF EXCEEDING STAGES AT SPECIFIC LOCATIONS
: VALID PERIOD = 05/31/2026 - 08/29/2026
: 95% 90% 75% 50% 25% 10% 5%
: --- --- --- --- --- --- ---
:WIND R
DUBW4 3.2/ 3.2/ 3.3/ 3.4/ 3.5/ 3.8/ 4.5/
:WIND R ABV RED CR
WRCW4 4.7/ 5.1/ 5.2/ 5.4/ 5.7/ 6.4/ 6.4/
:WIND R
CROW4 6.9/ 7.2/ 7.3/ 7.4/ 7.5/ 7.8/ 8.2/
KINW4 4.4/ 5.2/ 5.4/ 5.6/ 6.0/ 6.3/ 6.7/
WDRW4 3.1/ 4.1/ 4.3/ 4.7/ 5.5/ 5.8/ 6.5/
:LITTLE WIND R
RVTW4 3.3/ 3.7/ 3.9/ 4.4/ 4.9/ 5.3/ 5.6/
:BIGHORN R
BHBW4 3.9/ 4.0/ 4.1/ 4.4/ 4.6/ 5.5/ 6.7/
GYBW4 82.3/ 82.6/ 83.0/ 83.5/ 84.2/ 84.7/ 86.0/
:N FK SHOSHONE R
NFSW4 5.1/ 5.5/ 5.8/ 6.0/ 6.3/ 6.7/ 7.9/
:S FK SHOSHONE R
BBRW4 5.7/ 6.3/ 6.5/ 6.7/ 6.9/ 7.2/ 7.3/
:SHOSHONE R
SLOW4 5.7/ 6.8/ 7.3/ 8.6/ 9.2/ 9.6/ 9.7/
.END
IN TABLE 3 BELOW...THE 95 THROUGH 5 PERCENT COLUMNS INDICATE THE HEFS
PROBABILITY OF FALLING BELOW THE LISTED STAGE LEVELS (FT) FOR THE VALID
TIME PERIOD.
:...TABLE 3--HEFS NONEXCEEDANCE PROBABILITIES...
.B KRF 0531 Z DH12 /DC2605261917/DVD90/HGVFPNT/HGVFPN9/HGVFPNH
.B1 /HGVFPN5/HGVFPNG/HGVFPN1/HGVFPNF
: CHANCE OF FALLING BELOW STAGES (FT) AT SPECIFIC LOCATIONS
: VALID PERIOD = 05/31/2026 - 08/29/2026
: 95% 90% 75% 50% 25% 10% 5%
: --- --- --- --- --- --- ---
:WIND R
DUBW4 2.6/ 2.5/ 2.5/ 2.5/ 2.5/ 2.5/ 2.4/
:WIND R ABV RED CR
WRCW4 2.7/ 2.7/ 2.6/ 2.5/ 2.5/ 2.5/ 2.4/
:WIND R
CROW4 5.2/ 5.1/ 4.8/ 4.2/ 3.7/ 3.4/ 3.2/
KINW4 3.1/ 3.1/ 3.1/ 3.1/ 3.1/ 3.0/ 3.0/
WDRW4 2.4/ 2.3/ 2.3/ 2.3/ 2.3/ 2.3/ 2.2/
:LITTLE WIND R
RVTW4 1.6/ 1.6/ 1.5/ 1.5/ 1.5/ 1.5/ 1.4/
:BIGHORN R
BHBW4 3.3/ 3.2/ 3.2/ 3.1/ 3.0/ 3.0/ 3.0/
GYBW4 81.4/ 81.4/ 81.3/ 81.1/ 81.0/ 80.9/ 80.8/
:N FK SHOSHONE R
NFSW4 3.2/ 3.2/ 3.1/ 3.1/ 3.0/ 3.0/ 3.0/
:S FK SHOSHONE R
BBRW4 4.2/ 4.2/ 4.1/ 4.1/ 4.1/ 4.1/ 4.1/
:SHOSHONE R
SLOW4 4.3/ 4.3/ 4.3/ 4.1/ 4.0/ 3.9/ 3.8/
.END
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