FGUS53 KKRF 181520 RVFYEL RIVER FORECAST NWS MISSOURI BASIN RIVER FORECAST CENTER PLEASANT HILL MO 1519Z MON MAY 18 2026 : : THIS PRODUCT HAS PRELIMINARY DATA AND SUBJECT TO REVISION. : REFER TO YOUR LOCAL WFO FOR THE LATEST OFFICIAL RIVER FORECAST. : FORECAST GROUP IS YELLOW : ************************************************************** : *** This forecast includes projected snowmelt due to *** : *** forecasted 6-hour mean temperatures for next 15 days. *** : ************************************************************** : ==> This forecast includes obsd precip & 72 hours of QPF :________________________________________________________________ :CORWIN SPRINGS, MT - YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 11.0 FT FCST ISSUANCE STAGE 9.5 FT :MODERATE FLOOD STAGE 12.0 FT MAJOR FLOOD STAGE 13.0 FT :LATEST RIVER STAGE 4.3 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 4.6 / 4.5 / 4.4 / 4.4 : .ER CORM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 4.3 / 4.2 / 4.1 .E2 : 0519 : / 3.9 / 3.8 / 3.7 / 3.7 .E3 : 0520 : / 3.6 / 3.6 / 3.5 / 3.5 .E4 : 0521 : / 3.5 / 3.4 / 3.4 / 3.5 .E5 : 0522 : / 3.6 / 3.6 / 3.6 / 3.6 .E6 : 0523 : / 3.7 / 3.7 / 3.6 / 3.7 .E7 : 0524 : / 3.8 / 3.8 / 3.8 / 3.9 .E8 : 0525 : / 4.2 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.05 : 0521 / 0.10 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.15 inches :CORWIN SPRINGS, MT - YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 5.920 KCFS AT 1400Z ON MAY 18 : .ER CORM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 5.768 / 5.528 / 5.261 .E2 : 0519 : / 5.020 / 4.781 / 4.639 / 4.526 .E3 : 0520 : / 4.414 / 4.318 / 4.230 / 4.166 .E4 : 0521 : / 4.179 / 4.096 / 4.034 / 4.172 .E5 : 0522 : / 4.368 / 4.388 / 4.376 / 4.423 .E6 : 0523 : / 4.519 / 4.484 / 4.473 / 4.545 .E7 : 0524 : / 4.722 / 4.759 / 4.792 / 4.853 .E8 : 0525 : / 5.492 : :________________________________________________________________ :LIVINGSTON 5 S, MT - YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 10.0 FT FCST ISSUANCE STAGE 8.0 FT :MODERATE FLOOD STAGE 10.5 FT MAJOR FLOOD STAGE 11.0 FT :LATEST RIVER STAGE 4.0 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 4.3 / 4.2 / 4.1 / 4.0 : .ER LIVM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 4.0 / 3.9 / 3.9 .E2 : 0519 : / 3.8 / 3.7 / 3.6 / 3.5 .E3 : 0520 : / 3.4 / 3.4 / 3.4 / 3.3 .E4 : 0521 : / 3.3 / 3.3 / 3.3 / 3.2 .E5 : 0522 : / 3.3 / 3.3 / 3.4 / 3.4 .E6 : 0523 : / 3.4 / 3.4 / 3.4 / 3.4 .E7 : 0524 : / 3.4 / 3.5 / 3.5 / 3.5 .E8 : 0525 : / 3.5 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.08 : 0521 / 0.12 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.20 inches :LIVINGSTON 5 S, MT - YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 6.770 KCFS AT 1400Z ON MAY 18 : .ER LIVM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 6.635 / 6.469 / 6.245 .E2 : 0519 : / 5.976 / 5.711 / 5.460 / 5.282 .E3 : 0520 : / 5.144 / 5.015 / 4.906 / 4.807 .E4 : 0521 : / 4.728 / 4.804 / 4.694 / 4.636 .E5 : 0522 : / 4.700 / 4.859 / 4.927 / 4.922 .E6 : 0523 : / 4.941 / 5.002 / 4.999 / 4.982 .E7 : 0524 : / 5.016 / 5.173 / 5.232 / 5.271 .E8 : 0525 : / 5.330 : :________________________________________________________________ :LIVINGSTON 7 NE, MT - SHIELDS RIVER HSA - BYZ :MINOR FLOOD STAGE 5.5 FT FCST ISSUANCE STAGE 4.5 FT :MODERATE FLOOD STAGE Missing MAJOR FLOOD STAGE Missing :LATEST RIVER STAGE 1.6 FT AT 1415Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 1.7 / 1.6 / 1.6 / 1.6 : .ER SLDM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 1.6 / 1.6 / 1.6 .E2 : 0519 : / 1.6 / 1.5 / 1.5 / 1.5 .E3 : 0520 : / 1.4 / 1.5 / 1.5 / 1.5 .E4 : 0521 : / 1.5 / 1.5 / 1.5 / 1.5 .E5 : 0522 : / 1.5 / 1.5 / 1.5 / 1.5 .E6 : 0523 : / 1.5 / 1.5 / 1.5 / 1.4 .E7 : 0524 : / 1.4 / 1.5 / 1.5 / 1.4 .E8 : 0525 : / 1.4 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.01 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.09 : 0521 / 0.12 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.22 inches :LIVINGSTON 7 NE, MT - SHIELDS RIVER HSA - BYZ :LATEST RIVER DISCHARGE 0.297 KCFS AT 1415Z ON MAY 18 : .ER SLDM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 0.297 / 0.293 / 0.288 .E2 : 0519 : / 0.283 / 0.269 / 0.252 / 0.243 .E3 : 0520 : / 0.238 / 0.276 / 0.247 / 0.248 .E4 : 0521 : / 0.286 / 0.302 / 0.301 / 0.294 .E5 : 0522 : / 0.293 / 0.308 / 0.308 / 0.293 .E6 : 0523 : / 0.290 / 0.294 / 0.290 / 0.279 .E7 : 0524 : / 0.275 / 0.285 / 0.286 / 0.278 .E8 : 0525 : / 0.277 : :________________________________________________________________ :BIG TIMBER 1 E, MT - BOULDER RIVER HSA - BYZ :MINOR FLOOD STAGE 8.0 FT FCST ISSUANCE STAGE 6.5 FT :MODERATE FLOOD STAGE Missing MAJOR FLOOD STAGE Missing :LATEST RIVER STAGE 2.8 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 3.0 / 2.9 / 2.9 / 2.8 : .ER BTMM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 2.8 / 2.7 / 2.6 .E2 : 0519 : / 2.5 / 2.4 / 2.4 / 2.3 .E3 : 0520 : / 2.3 / 2.2 / 2.2 / 2.2 .E4 : 0521 : / 2.2 / 2.2 / 2.2 / 2.2 .E5 : 0522 : / 2.3 / 2.3 / 2.3 / 2.3 .E6 : 0523 : / 2.3 / 2.3 / 2.3 / 2.4 .E7 : 0524 : / 2.4 / 2.5 / 2.6 / 2.5 .E8 : 0525 : / 2.5 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.01 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.01 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.01 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.01 / 0.15 : 0521 / 0.21 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.38 inches :BIG TIMBER 1 E, MT - BOULDER RIVER HSA - BYZ :LATEST RIVER DISCHARGE 0.899 KCFS AT 1400Z ON MAY 18 : .ER BTMM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 0.854 / 0.811 / 0.759 .E2 : 0519 : / 0.688 / 0.634 / 0.602 / 0.565 .E3 : 0520 : / 0.527 / 0.505 / 0.488 / 0.474 .E4 : 0521 : / 0.466 / 0.464 / 0.474 / 0.504 .E5 : 0522 : / 0.536 / 0.554 / 0.565 / 0.571 .E6 : 0523 : / 0.571 / 0.567 / 0.577 / 0.596 .E7 : 0524 : / 0.620 / 0.696 / 0.716 / 0.670 .E8 : 0525 : / 0.699 : :________________________________________________________________ :ABSAROKEE 1 NE, MT - STILLWATER RIVER HSA - BYZ :MINOR FLOOD STAGE 7.5 FT FCST ISSUANCE STAGE 6.0 FT :MODERATE FLOOD STAGE 8.0 FT MAJOR FLOOD STAGE 9.0 FT :LATEST RIVER STAGE 2.5 FT AT 1415Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 2.7 / 2.6 / 2.5 / 2.5 : .ER SRAM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 2.5 / 2.4 / 2.3 .E2 : 0519 : / 2.3 / 2.2 / 2.1 / 2.1 .E3 : 0520 : / 2.1 / 2.1 / 2.0 / 2.0 .E4 : 0521 : / 2.0 / 2.0 / 2.0 / 1.9 .E5 : 0522 : / 1.9 / 1.9 / 1.8 / 1.8 .E6 : 0523 : / 1.8 / 1.9 / 1.9 / 1.9 .E7 : 0524 : / 2.0 / 2.0 / 2.1 / 2.1 .E8 : 0525 : / 2.1 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.01 / 0.00 / 0.02 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.03 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.01 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.01 / 0.14 : 0521 / 0.27 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.43 inches :ABSAROKEE 1 NE, MT - STILLWATER RIVER HSA - BYZ :LATEST RIVER DISCHARGE 1.040 KCFS AT 1415Z ON MAY 18 : .ER SRAM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 0.995 / 0.934 / 0.863 .E2 : 0519 : / 0.807 / 0.752 / 0.714 / 0.682 .E3 : 0520 : / 0.657 / 0.637 / 0.618 / 0.601 .E4 : 0521 : / 0.596 / 0.590 / 0.577 / 0.565 .E5 : 0522 : / 0.550 / 0.536 / 0.527 / 0.512 .E6 : 0523 : / 0.525 / 0.537 / 0.542 / 0.554 .E7 : 0524 : / 0.585 / 0.623 / 0.645 / 0.669 .E8 : 0525 : / 0.700 : :________________________________________________________________ :BELFRY 10 SW, MT - CLARKS YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 9.0 FT FCST ISSUANCE STAGE 7.5 FT :MODERATE FLOOD STAGE 10.0 FT MAJOR FLOOD STAGE 11.5 FT :LATEST RIVER STAGE 3.5 FT AT 1500Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 3.7 / 3.6 / 3.5 / 3.5 : .ER BFYM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 3.4 / 3.4 / 3.3 .E2 : 0519 : / 3.2 / 3.1 / 3.0 / 2.9 .E3 : 0520 : / 2.8 / 2.7 / 2.6 / 2.6 .E4 : 0521 : / 2.6 / 2.6 / 2.7 / 2.7 .E5 : 0522 : / 2.7 / 2.8 / 2.8 / 2.8 .E6 : 0523 : / 2.9 / 2.9 / 2.9 / 3.1 .E7 : 0524 : / 3.2 / 3.3 / 3.4 / 3.5 .E8 : 0525 : / 3.7 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.02 / 0.01 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 15Z is 0.03 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.01 / 0.02 : 0521 / 0.10 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.13 inches :BELFRY 10 SW, MT - CLARKS YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 2.390 KCFS AT 1400Z ON MAY 18 : .ER BFYM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 2.224 / 2.131 / 2.024 .E2 : 0519 : / 1.902 / 1.795 / 1.717 / 1.633 .E3 : 0520 : / 1.535 / 1.456 / 1.395 / 1.365 .E4 : 0521 : / 1.380 / 1.397 / 1.412 / 1.449 .E5 : 0522 : / 1.478 / 1.492 / 1.496 / 1.528 .E6 : 0523 : / 1.583 / 1.610 / 1.667 / 1.785 .E7 : 0524 : / 1.905 / 2.063 / 2.164 / 2.349 .E8 : 0525 : / 2.619 : :________________________________________________________________ :EDGAR, MT - CLARKS YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 9.0 FT FCST ISSUANCE STAGE 7.5 FT :MODERATE FLOOD STAGE 10.0 FT MAJOR FLOOD STAGE 11.5 FT :LATEST RIVER STAGE 4.3 FT AT 1430Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 4.6 / 4.6 / 4.4 / 4.3 : .ER EDGM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 4.3 / 4.3 / 4.2 .E2 : 0519 : / 4.1 / 4.0 / 3.9 / 3.8 .E3 : 0520 : / 3.7 / 3.6 / 3.5 / 3.4 .E4 : 0521 : / 3.3 / 3.3 / 3.3 / 3.3 .E5 : 0522 : / 3.3 / 3.3 / 3.4 / 3.4 .E6 : 0523 : / 3.4 / 3.4 / 3.4 / 3.5 .E7 : 0524 : / 3.5 / 3.6 / 3.8 / 3.9 .E8 : 0525 : / 4.0 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.05 : 0521 / 0.14 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.19 inches :EDGAR, MT - CLARKS YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 2.210 KCFS AT 1430Z ON MAY 18 : .ER EDGM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 2.079 / 2.075 / 1.985 .E2 : 0519 : / 1.901 / 1.806 / 1.705 / 1.617 .E3 : 0520 : / 1.546 / 1.470 / 1.388 / 1.321 .E4 : 0521 : / 1.270 / 1.246 / 1.251 / 1.256 .E5 : 0522 : / 1.264 / 1.284 / 1.297 / 1.299 .E6 : 0523 : / 1.299 / 1.320 / 1.351 / 1.378 .E7 : 0524 : / 1.433 / 1.526 / 1.627 / 1.742 .E8 : 0525 : / 1.836 : :________________________________________________________________ :BILLINGS 1 NE, MT - YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 13.5 FT FCST ISSUANCE STAGE 11.5 FT :MODERATE FLOOD STAGE 14.5 FT MAJOR FLOOD STAGE 15.0 FT :LATEST RIVER STAGE 5.6 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 6.0 / 5.9 / 5.8 / 5.6 : .ER BILM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 5.5 / 5.4 / 5.3 .E2 : 0519 : / 5.1 / 5.0 / 4.9 / 4.8 .E3 : 0520 : / 4.7 / 4.5 / 4.4 / 4.3 .E4 : 0521 : / 4.2 / 4.2 / 4.1 / 4.0 .E5 : 0522 : / 4.0 / 3.9 / 3.9 / 3.8 .E6 : 0523 : / 3.9 / 3.9 / 3.9 / 3.9 .E7 : 0524 : / 3.9 / 3.9 / 3.9 / 4.0 .E8 : 0525 : / 4.0 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.13 : 0521 / 0.18 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.31 inches :BILLINGS 1 NE, MT - YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 11.800 KCFS AT 1400Z ON MAY 18 : .ER BILM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 11.271 / 10.769 / 10.266 .E2 : 0519 : / 9.763 / 9.261 / 8.839 / 8.624 .E3 : 0520 : / 8.175 / 7.696 / 7.271 / 6.924 .E4 : 0521 : / 6.750 / 6.613 / 6.373 / 6.207 .E5 : 0522 : / 6.129 / 5.997 / 5.873 / 5.769 .E6 : 0523 : / 5.836 / 5.811 / 5.790 / 5.795 .E7 : 0524 : / 5.823 / 5.890 / 5.936 / 6.025 .E8 : 0525 : / 6.183 : :________________________________________________________________ :FORSYTH, MT - YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 14.0 FT FCST ISSUANCE STAGE 12.0 FT :MODERATE FLOOD STAGE Missing MAJOR FLOOD STAGE Missing :LATEST RIVER STAGE 4.0 FT AT 1445Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 4.4 / 4.3 / 4.2 / 4.1 : .ER FRYM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 4.0 / 3.9 / 3.8 .E2 : 0519 : / 3.7 / 3.6 / 3.5 / 3.3 .E3 : 0520 : / 3.2 / 3.1 / 3.1 / 3.0 .E4 : 0521 : / 2.9 / 2.8 / 2.7 / 2.6 .E5 : 0522 : / 2.6 / 2.5 / 2.5 / 2.5 .E6 : 0523 : / 2.4 / 2.4 / 2.4 / 2.4 .E7 : 0524 : / 2.4 / 2.4 / 2.3 / 2.3 .E8 : 0525 : / 2.3 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.02 : 0521 / 0.10 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.12 inches :FORSYTH, MT - YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 16.300 KCFS AT 1445Z ON MAY 18 : .ER FRYM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 15.626 / 15.183 / 14.617 .E2 : 0519 : / 13.972 / 13.348 / 12.760 / 12.185 .E3 : 0520 : / 11.621 / 11.087 / 10.666 / 10.296 .E4 : 0521 : / 9.896 / 9.455 / 9.048 / 8.733 .E5 : 0522 : / 8.518 / 8.359 / 8.202 / 8.058 .E6 : 0523 : / 7.946 / 7.840 / 7.737 / 7.659 .E7 : 0524 : / 7.625 / 7.603 / 7.573 / 7.559 .E8 : 0525 : / 7.572 : :________________________________________________________________ :MILES CITY 1 NW, MT - YELLOWSTONE RIVER HSA - BYZ :MINOR FLOOD STAGE 14.0 FT FCST ISSUANCE STAGE 12.0 FT :MODERATE FLOOD STAGE Missing MAJOR FLOOD STAGE Missing :LATEST RIVER STAGE 5.6 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 6.0 / 5.9 / 5.8 / 5.7 : .ER MILM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 5.5 / 5.4 / 5.3 .E2 : 0519 : / 5.3 / 5.2 / 5.1 / 5.0 .E3 : 0520 : / 4.8 / 4.7 / 4.6 / 4.5 .E4 : 0521 : / 4.4 / 4.3 / 4.2 / 4.1 .E5 : 0522 : / 4.0 / 3.9 / 3.9 / 3.8 .E6 : 0523 : / 3.8 / 3.7 / 3.7 / 3.7 .E7 : 0524 : / 3.6 / 3.6 / 3.6 / 3.6 .E8 : 0525 : / 3.6 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.00 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.00 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.01 : 0521 / 0.07 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.08 inches :MILES CITY 1 NW, MT - YELLOWSTONE RIVER HSA - BYZ :LATEST RIVER DISCHARGE 16.400 KCFS AT 1400Z ON MAY 18 : .ER MILM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 15.995 / 15.435 / 14.973 .E2 : 0519 : / 14.576 / 14.122 / 13.604 / 13.081 .E3 : 0520 : / 12.578 / 12.084 / 11.592 / 11.120 .E4 : 0521 : / 10.676 / 10.291 / 9.908 / 9.497 .E5 : 0522 : / 9.098 / 8.762 / 8.516 / 8.335 .E6 : 0523 : / 8.177 / 8.032 / 7.911 / 7.800 .E7 : 0524 : / 7.695 / 7.607 / 7.555 / 7.521 .E8 : 0525 : / 7.489 : :________________________________________________________________ :GLENDIVE 1 E, MT - YELLOWSTONE RIVER HSA - GGW :MINOR FLOOD STAGE 53.5 FT FCST ISSUANCE STAGE 51.5 FT :MODERATE FLOOD STAGE 60.0 FT MAJOR FLOOD STAGE 65.0 FT :LATEST RIVER STAGE 45.6 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 45.7 / 45.8 / 45.8 / 45.7 : .ER GLNM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 45.5 / 45.4 / 45.3 .E2 : 0519 : / 45.2 / 45.1 / 45.1 / 45.0 .E3 : 0520 : / 44.9 / 44.8 / 44.7 / 44.7 .E4 : 0521 : / 44.6 / 44.5 / 44.4 / 44.4 .E5 : 0522 : / 44.3 / 44.2 / 44.1 / 44.0 .E6 : 0523 : / 43.9 / 43.8 / 43.8 / 43.7 .E7 : 0524 : / 43.7 / 43.7 / 43.6 / 43.6 .E8 : 0525 : / 43.6 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.03 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.03 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.00 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.00 / 0.00 : 0521 / 0.04 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.04 inches :GLENDIVE 1 E, MT - YELLOWSTONE RIVER HSA - GGW :LATEST RIVER DISCHARGE 19.200 KCFS AT 1400Z ON MAY 18 : .ER GLNM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 18.255 / 17.230 / 16.657 .E2 : 0519 : / 16.071 / 15.531 / 15.051 / 14.596 .E3 : 0520 : / 14.127 / 13.628 / 13.115 / 12.607 .E4 : 0521 : / 12.115 / 11.636 / 11.180 / 10.751 .E5 : 0522 : / 10.345 / 9.949 / 9.559 / 9.196 .E6 : 0523 : / 8.888 / 8.644 / 8.453 / 8.297 .E7 : 0524 : / 8.160 / 8.038 / 7.930 / 7.837 .E8 : 0525 : / 7.764 : :________________________________________________________________ :SIDNEY 2 S, MT - YELLOWSTONE RIVER HSA - GGW :MINOR FLOOD STAGE 19.0 FT FCST ISSUANCE STAGE 17.0 FT :MODERATE FLOOD STAGE 20.0 FT MAJOR FLOOD STAGE 21.7 FT :LATEST RIVER STAGE 6.8 FT AT 1400Z ON MAY 18 :obs Stage / 18Z / 00Z / 06Z / 12Z : 0517 / 5.8 / 6.2 / 6.5 / 6.7 : .ER SIDM8 20260518 Z DC202605181519/DH18/HGIFFZZ/DIH6 :Stage Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 6.8 / 6.7 / 6.5 .E2 : 0519 : / 6.3 / 6.1 / 6.0 / 5.8 .E3 : 0520 : / 5.7 / 5.6 / 5.4 / 5.3 .E4 : 0521 : / 5.2 / 5.0 / 4.9 / 4.7 .E5 : 0522 : / 4.6 / 4.4 / 4.3 / 4.1 .E6 : 0523 : / 4.0 / 3.9 / 3.7 / 3.6 .E7 : 0524 : / 3.5 / 3.5 / 3.4 / 3.3 .E8 : 0525 : / 3.3 :Local observed 6-hr basin-averaged precip(inches) (PAST 24 hrs): : / 18Z / 00Z / 06Z / 12Z : 0517 / 0.03 / 0.00 / 0.00 / 0.00 : :Local observed 24-hr basin-averaged precip total : QPE Total Ending May 18 at 14Z is 0.03 inches : :Local forecast 6-hr basin-averaged precip(inches) (NEXT 72 hrs): : / 12Z / 18Z / 00Z / 06Z : 0518 / 0.01 / 0.00 / 0.00 : 0519 / 0.00 / 0.00 / 0.00 / 0.00 : 0520 / 0.00 / 0.00 / 0.01 / 0.00 : 0521 / 0.00 : :Local forecast 72-hr basin-averaged precip total : QPF Total Ending May 21 0.02 inches :SIDNEY 2 S, MT - YELLOWSTONE RIVER HSA - GGW :LATEST RIVER DISCHARGE 18.300 KCFS AT 1400Z ON MAY 18 : .ER SIDM8 20260518 Z DC202605181519/DH18/QRIFFZZ/DIH6 :Flow Fcst / 12Z / 18Z / 00Z / 06Z .E1 : 0518 : / 18.542 / 18.036 / 17.146 .E2 : 0519 : / 16.312 / 15.620 / 15.030 / 14.487 .E3 : 0520 : / 14.002 / 13.538 / 13.079 / 12.592 .E4 : 0521 : / 12.104 / 11.620 / 11.130 / 10.654 .E5 : 0522 : / 10.202 / 9.779 / 9.363 / 8.961 .E6 : 0523 : / 8.567 / 8.201 / 7.893 / 7.634 .E7 : 0524 : / 7.406 / 7.219 / 7.069 / 6.920 .E8 : 0525 : / 6.770 : :**************************************************************** :COMMENT : : :HSA - Hydrologic Service Area :WFO - Weather Forecast Office :RIW - NWS WFO Riverton, Wyoming :BYZ - NWS WFO Billings, Montana :GGW - NWS WFO Glasgow, Montana :OBS - Observed :EST - Estimated :M - Missing :Stage Fcst - River Stage forecast including future precipitation :Flow Fcst - River Flow forecast including future precipitation :Precip - Precipitation :QPE - Observed radar estimated precipitation :QPF - Forecasted mean areal precipitation for local basin : : $$ :MBRFC alc :...END of MESSAGE...