Advertisement
Flow report

Michigan River Levels & Streamflow

As of Sep 20, 2026, Michigan rivers are running at 96% of normal across 125 USGS gauges — the highest is 2,760 cfs on the St. Joseph River At Niles. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Michigan.

USGS gauges
125
State percent normal
96%
Paddle runs
0
Updated
Sep 20
Open the Michigan flow layer on the map Every USGS streamgauge filtered to Michigan.
Open the map →
September
20
2026
Flow briefing

Streamflow levels across Michigan are currently 96% of normal, with the St. Joseph River At Niles reporting the highest discharge in the state at 2,760 cfs and a gauge stage of 5.52 ft.

Meanwhile, the Grand River At Portland is seeing a spike today — up 32% since yesterday and currently running near peak.

Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into Michigan's named rivers.

Active weather warnings for Michigan

# Michigan Storm Center Report

A Beach Hazards Statement remains in effect for Michigan's Upper Peninsula through 8:00 PM EDT today. Dangerous swimming conditions are expected in Marquette and Alger Counties due to high wave action and strong rip currents, with waves in rapid succession posing life-threatening risks to swimmers. Particularly hazardous areas include Middle Bay and Little Presque Isle in Marquette County, as well as the Au Train River mouth, Grand Marais Harbor, and Pictured Rocks National Lakeshore in Alger County. Residents and visitors in these regions are strongly advised to avoid water entry and exercise extreme caution near shorelines through this evening.

Source: National Weather Service

Michigan at a glance

State-wide streamflow overview

The Michigan flow picture in four data points -- where the state sits versus historical norms, what's flowing hardest, and what's spiking fastest.

Percent of normal

96%

100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.

Highest discharge

St. Joseph River At Niles 2,760 cfs

Gauge stage 5.52 ft

Biggest 24h spike

Grand River At Portland +32%

Now 485 cfs

Network coverage

Gauges + rivers tracked 125 + 0

USGS gauges feeding 0 named rivers in Michigan.

Where every gauge actually sits

One dot per Michigan streamgauge, placed by its own percent of normal. The state average is a single line through all of it.

State average 96%
0% 50% 100% · normal 150% 200%+
Much below normalunder 50% Below normal50–90% Near normal90–110% Above normal110–150% Much above normalover 150%

Percent of normal compares today's discharge with the historical average for this calendar day. Tap any dot to open that gauge.

Michigan streamflow, three water years

Statewide percent of normal, every day since Sep 2023. The dotted line is normal.

96% of normal today
+4pts vs this day last year (92%)
261of 366 days below normal, past year
250% 3-year peak · Apr 2026 · above the axis
50% 100% normal 150%
Sep 2023 202420252026 Sep 20, 2026

799 daily readings from 125 reporting gauges. Percent of normal is today's statewide discharge against the historical average for the same calendar day — 100% is normal, not "good". The axis tops out at 175%: 14 readings above that — including the 250% peak in Apr 2026 — are drawn along the top edge, so a few flood days cannot flatten three years of everything else. The line breaks in 2 places where the record skips more than five days — those are gaps in reporting, not readings of zero.

Full streamgauge inventory

Michigan USGS streamgauges

Every USGS gauge Snoflo tracks in Michigan. Sortable, quickly filterable. Numeric columns heat-mapped from light to deep. Tap any gauge for its full hydrograph and forecast.

125 gauges
Streamgage Streamflow Gage height Water temp Air temp Elevation Watershed
St. Joseph River At Niles, Mi
10 hours ago · USGS 04101500
2,680 cfs 5.49 ft 70°F 65°F 664 ft St. Joseph
Grand River At Grand Rapids, Mi
10 hours ago · USGS 04119000
2,410 cfs 2.39 ft · 62°F 587 ft Lower Grand
Kalamazoo River At New Richmond, Mi
10 hours ago · USGS 04108660
1,780 cfs 11.39 ft 67°F 62°F 605 ft Kalamazoo
Manistee River Near Wellston, Mi
9 hours ago · USGS 04125550
1,740 cfs 8.84 ft 64°F 71°F 621 ft Manistee
Au Sable River Near Au Sable, Mi
10 hours ago · USGS 04137500
1,400 cfs 8.91 ft 69°F 66°F 587 ft Au Sable
Au Sable River Near Curtisville, Mi
10 hours ago · USGS 04137005
1,330 cfs 8.55 ft 62°F 68°F 803 ft Au Sable
Manistee River Near Mesick, Mi
9 hours ago · USGS 04124200
1,310 cfs 3.93 ft 64°F 70°F 754 ft Manistee
Menominee River At Koss, Mi
10 hours ago · USGS 04066800
1,280 cfs 9.94 ft · 47°F 663 ft Menominee
Muskegon River Near Croton, Mi
9 hours ago · USGS 04121970
1,270 cfs 4.72 ft 68°F 59°F 685 ft Muskegon
Au Sable River Near Mc Kinley, Mi
9 hours ago · USGS 04136900
1,220 cfs 7.74 ft 59°F 67°F 853 ft Au Sable
St. Joseph River At Mottville, Mi
10 hours ago · USGS 04099000
1,170 cfs 3.01 ft · 64°F 780 ft St. Joseph
Menominee River Near Vulcan, Mi
11 hours ago · USGS 04065722
1,090 cfs 5.00 ft · 46°F 807 ft Menominee
Au Sable River At Mio, Mi
9 hours ago · USGS 04136500
1,090 cfs 3.27 ft 59°F 67°F 946 ft Au Sable
Manistee River Near Sherman, Mi
9 hours ago · USGS 04124000
1,070 cfs 12.21 ft 56°F 70°F 820 ft Manistee
Menominee River At White Rapids Dam Near Banat, Mi
10 hours ago · USGS 04066030
1,030 cfs 6.24 ft · 47°F 689 ft Menominee
Menominee River Below Pemene Creek Near Pembine, Mi
10 hours ago · USGS 04066003
1,020 cfs 6.92 ft · 47°F 748 ft Menominee
Kalamazoo River At Comstock, Mi
10 hours ago · USGS 04106000
946 cfs 4.59 ft · 63°F 792 ft Kalamazoo
Au Sable River Near Red Oak, Mi
9 hours ago · USGS 04136000
941 cfs 3.38 ft 56°F 67°F 1,008 ft Au Sable
Grand River At Ionia, Mi
9 hours ago · USGS 04116000
852 cfs 8.70 ft · 61°F 620 ft Lower Grand
Menominee River Near Florence, Mi
11 hours ago · USGS 04063000
774 cfs 3.21 ft · 51°F 1,118 ft Brule
St. Joseph River At Three Rivers, Mi
9 hours ago · USGS 04097500
770 cfs 3.45 ft · 64°F 800 ft St. Joseph
Kalamazoo River Near Battle Creek, Mi
9 hours ago · USGS 04105500
740 cfs 3.50 ft · 61°F 804 ft Kalamazoo
Thunder Bay River At Herron Road Near Bolton, Mi
10 hours ago · USGS 04133501
610 cfs 12.49 ft · 65°F 704 ft Thunder Bay
Muskegon River At Evart, Mi
9 hours ago · USGS 04121500
577 cfs 7.02 ft · 56°F 997 ft Muskegon
Clinton River At Moravian Drive At Mt. Clemens, Mi
10 hours ago · USGS 04165500
554 cfs 6.49 ft 65°F 58°F 574 ft Clinton
Kalamazoo River At Marshall, Mi
9 hours ago · USGS 04103500
520 cfs 4.89 ft · 60°F 882 ft Kalamazoo
Manistique River Near Manistique, Mi
9 hours ago · USGS 04056500
500 cfs 2.42 ft · 67°F 617 ft Manistique
Ontonagon River Near Rockland, Mi
10 hours ago · USGS 04040000
494 cfs 5.26 ft 32°F 63°F 670 ft Ontonagon
Grand River At Portland, Mi
10 hours ago · USGS 04114000
479 cfs 6.06 ft · 58°F 719 ft Upper Grand
Grand River At Lansing, Mi
10 hours ago · USGS 04113000
478 cfs 3.18 ft · 60°F 808 ft Upper Grand
Tittabawassee River At Midland, Mi
9 hours ago · USGS 04156000
478 cfs 9.11 ft · 59°F 586 ft Tittabawassee
Pere Marquette River At Scottville, Mi
9 hours ago · USGS 04122500
461 cfs 1.05 ft · 57°F 625 ft Pere Marquette-White
Paw Paw River At Riverside, Mi
9 hours ago · USGS 04102500
417 cfs 6.63 ft · 64°F 610 ft St. Joseph
Clinton River Near Fraser, Mi
10 hours ago · USGS 04164000
410 cfs 7.18 ft · 58°F 586 ft Clinton
White River Near Whitehall, Mi
10 hours ago · USGS 04122200
336 cfs 1.55 ft · 59°F 619 ft Pere Marquette-White
Dowagiac River At Sumnerville, Mi
9 hours ago · USGS 04101800
335 cfs 6.00 ft · 65°F 716 ft St. Joseph
River Raisin Near Monroe, Mi
9 hours ago · USGS 04176500
330 cfs 2.81 ft 67°F 61°F 618 ft Raisin
Tahquamenon River Near Paradise, Mi
9 hours ago · USGS 04045500
294 cfs 3.30 ft · 64°F 729 ft Tahquamenon
Thornapple River Near Hastings, Mi
10 hours ago · USGS 04117500
291 cfs 3.61 ft · 59°F 803 ft Thornapple
Michigamme River Near Crystal Falls, Mi
10 hours ago · USGS 04062500
279 cfs 2.78 ft · 43°F 1,305 ft Michigamme
Escanaba River At Cornell, Mi
9 hours ago · USGS 04059000
261 cfs 1.36 ft 58°F 64°F 735 ft Escanaba
Huron River At Ann Arbor, Mi
9 hours ago · USGS 04174500
242 cfs 12.18 ft 64°F 60°F 758 ft Huron
Paint River Nr Alpha, Mi
13 hours ago · USGS 04062000
235 cfs 3.23 ft · 43°F 1,271 ft Brule
Pine River At High School Bridge Nr Hoxeyville, Mi
9 hours ago · USGS 04125460
218 cfs 3.96 ft 54°F 71°F 856 ft Manistee
Clinton River At Sterling Heights, Mi
9 hours ago · USGS 04161820
218 cfs 8.22 ft 63°F 59°F 612 ft Clinton
Rifle River Near Sterling, Mi
10 hours ago · USGS 04142000
212 cfs 1.63 ft 53°F 58°F 639 ft Au Gres-Rifle
South Branch Au Sable River Near Luzerne, Mi
10 hours ago · USGS 04135700
211 cfs 4.89 ft 56°F 67°F 1,070 ft Au Sable
Flint River Near Flint, Mi
10 hours ago · USGS 04148500
209 cfs 3.53 ft · 58°F 684 ft Flint
Sturgeon River At Wolverine, Mi
10 hours ago · USGS 04127997
207 cfs 2.88 ft · 66°F 778 ft Cheboygan
Tobacco River At Glidden Road At Beaverton, Mi
10 hours ago · USGS 04152500
189 cfs 2.37 ft · 58°F 715 ft Tittabawassee
Brule River At Us Highway 2 Near Florence, Mi
11 hours ago · USGS 04060993
183 cfs 3.47 ft · 51°F 1,241 ft Brule
Jordan River Near East Jordan, Mi
10 hours ago · USGS 04127800
181 cfs 3.46 ft · 68°F 629 ft Boardman-Charlevoix
River Raisin Near Adrian, Mi
10 hours ago · USGS 04176000
178 cfs 4.60 ft · 61°F 699 ft Raisin
Shiawassee River At Owosso, Mi
10 hours ago · USGS 04144500
166 cfs 2.32 ft · 58°F 695 ft Shiawassee
Battle Creek At Battle Creek, Mi
10 hours ago · USGS 04105000
163 cfs · · 61°F 824 ft Kalamazoo
Rogue River Near Rockford, Mi
10 hours ago · USGS 04118500
163 cfs 4.01 ft · 58°F 665 ft Lower Grand
Little Muskegon River Near Oak Grove, Mi
9 hours ago · USGS 04121944
161 cfs 3.16 ft 59°F 59°F 756 ft Muskegon
Platte River At Honor, Mi
10 hours ago · USGS 04126740
159 cfs 1.39 ft · 69°F 606 ft Betsie-Platte
Grand River At Jackson, Mi
10 hours ago · USGS 04109000
157 cfs 10.08 ft · 60°F 911 ft Upper Grand
South Branch Black River Near Bangor, Mi
9 hours ago · USGS 04102700
141 cfs 4.54 ft · 62°F 613 ft Black-Macatawa
Macatawa River At State Road Near Zeeland, Mi
9 hours ago · USGS 04108800
137 cfs 4.75 ft · 59°F 598 ft Black-Macatawa
Chippewa River Near Mount Pleasant, Mi
10 hours ago · USGS 04154000
130 cfs 3.20 ft · 58°F 730 ft Pine
Boardman R Above Brown Bridge Road Nr Mayfield, Mi
10 hours ago · USGS 04126970
124 cfs 3.28 ft · 68°F 826 ft Boardman-Charlevoix
Huron River Near Hamburg, Mi
10 hours ago · USGS 04172000
123 cfs 4.48 ft · 59°F 852 ft Huron
Saline River Near Saline, Mi
10 hours ago · USGS 04176400
121 cfs 6.30 ft · 60°F 711 ft Raisin
River Rouge At Detroit, Mi
9 hours ago · USGS 04166500
118 cfs 6.08 ft 64°F 60°F 591 ft Detroit
St. Joseph River At Burlington, Mi
10 hours ago · USGS 04096405
116 cfs 3.67 ft · 61°F 906 ft St. Joseph
Mill Creek Near Dexter, Mi
9 hours ago · USGS 04173500
114 cfs 6.79 ft · 59°F 856 ft Huron
Sturgeon River Near Alston, Mi
10 hours ago · USGS 04041500
113 cfs 3.82 ft 61°F 50°F 735 ft Sturgeon
Lower River Rouge At Dearborn, Mi
10 hours ago · USGS 04168400
104 cfs 3.73 ft 66°F 60°F 582 ft Detroit
Red Cedar River At East Lansing, Mi
10 hours ago · USGS 04112500
99 cfs 3.47 ft · 60°F 829 ft Upper Grand
Flint River Near Otisville, Mi
9 hours ago · USGS 04147500
97 cfs 2.71 ft · 56°F 728 ft Flint
Pine River Near Midland, Mi
9 hours ago · USGS 04155500
93 cfs 2.69 ft · 56°F 628 ft Pine
Middle Branch Ontonagon River Near Paulding, Mi
9 hours ago · USGS 04033000
93 cfs 4.13 ft · 61°F 1,500 ft Ontonagon
Middle River Rouge Near Garden City, Mi
10 hours ago · USGS 04167000
89 cfs 3.83 ft · 60°F 609 ft Detroit
Middle Branch Escanaba River Nr Princeton, Mi
9 hours ago · USGS 04058100
80 cfs 1.52 ft · 58°F 1,114 ft Escanaba
River Rouge At Southfield, Mi
10 hours ago · USGS 04166100
80 cfs 4.97 ft 63°F 60°F 618 ft Detroit
Pigeon R At Sturgeon Valley Rd Near Vanderbilt, Mi
10 hours ago · USGS 04128990
79 cfs 2.27 ft · 66°F 914 ft Cheboygan
Portage Creek At Kalamazoo, Mi
9 hours ago · USGS 04106500
76 cfs 2.64 ft · 64°F 766 ft Kalamazoo
Cass River At Frankenmuth, Mi
9 hours ago · USGS 04151500
75 cfs 3.64 ft · 55°F 591 ft Cass
Looking Glass River Near Eagle, Mi
9 hours ago · USGS 04114498
74 cfs 2.93 ft · 59°F 754 ft Upper Grand
Rabbit River Near Hopkins, Mi
10 hours ago · USGS 04108600
74 cfs 4.02 ft · 60°F 717 ft Kalamazoo
Augusta Creek Near Augusta, Mi
10 hours ago · USGS 04105700
70 cfs 1.48 ft · 63°F 817 ft Kalamazoo
Clam River At Vogel Center, Mi
10 hours ago · USGS 04121300
69 cfs 2.74 ft · 54°F 1,134 ft Muskegon
Sturgeon River Near Nahma Junction, Mi
9 hours ago · USGS 04057510
60 cfs 3.83 ft · 66°F 662 ft Fishdam-Sturgeon
Iron River At County Hwy-424 At Caspian, Mi
11 hours ago · USGS 04060500
58 cfs 4.01 ft · 46°F 1,446 ft Brule
South Branch Tobacco River Near Beaverton, Mi
10 hours ago · USGS 04152238
53 cfs 4.27 ft · 58°F 727 ft Tittabawassee
Red Cedar River Near Williamston, Mi
10 hours ago · USGS 04111379
51 cfs 2.66 ft · 59°F 865 ft Upper Grand
Prairie River Near Nottawa, Mi
10 hours ago · USGS 04097540
51 cfs 3.20 ft 36°F 63°F 872 ft St. Joseph
Maple River At Maple Rapids, Mi
10 hours ago · USGS 04115000
48 cfs 2.89 ft · 60°F 646 ft Maple
Wanadoga Creek Near Battle Creek, Mi
10 hours ago · USGS 04104945
45 cfs 4.14 ft · 60°F 833 ft Kalamazoo
South Branch Flint River Near Columbiaville, Mi
10 hours ago · USGS 04146063
45 cfs 1.45 ft · 55°F 768 ft Flint
Clinton River At Auburn Hills, Mi
9 hours ago · USGS 04161000
44 cfs 1.14 ft · 58°F 846 ft Clinton
Sycamore Creek At Holt Road Near Holt, Mi
10 hours ago · USGS 04112850
43 cfs 3.09 ft · 59°F 856 ft Upper Grand
Ford River Near Hyde, Mi
10 hours ago · USGS 04059500
40 cfs 1.60 ft 46°F 66°F 707 ft Cedar-Ford
Galien River Near Sawyer, Mi
10 hours ago · USGS 04096015
37 cfs 6.50 ft · 65°F 614 ft Little Calumet-Galien
West Branch Ontonagon River Near Bergland, Mi
9 hours ago · USGS 04036000
34 cfs 1.23 ft · 46°F 1,304 ft Ontonagon
South Branch Hog Creek Near Allen, Mi
9 hours ago · USGS 04096515
32 cfs 2.41 ft · 62°F 1,013 ft St. Joseph
Greenwood Release Near Greenwood, Mi
10 hours ago · USGS 04057814
27 cfs 2.45 ft · 57°F 1,478 ft Escanaba
West Fork Portage Creek At Kalamazoo, Mi
9 hours ago · USGS 04106400
22 cfs 2.82 ft · 64°F 883 ft Kalamazoo
Plum Brook At Utica, Mi
9 hours ago · USGS 04163400
22 cfs 2.57 ft · 59°F 633 ft Clinton
Fish Creek Near Crystal, Mi
9 hours ago · USGS 04115265
22 cfs 2.31 ft · 59°F 802 ft Maple
Greenwood Diversion Near Greenwood, Mi
10 hours ago · USGS 04057813
21 cfs 1.63 ft · 57°F 1,439 ft Escanaba
Malletts Creek At Ann Arbor, Mi
10 hours ago · USGS 04174518
21 cfs 3.61 ft · 60°F 749 ft Huron
Kearsley Creek Near Davison, Mi
10 hours ago · USGS 04148140
20 cfs 3.43 ft · 56°F 759 ft Flint
Upper River Rouge At Farmington, Mi
10 hours ago · USGS 04166300
20 cfs 3.19 ft · 60°F 692 ft Detroit
Black River Near Jeddo, Mi
9 hours ago · USGS 04159492
19 cfs 3.03 ft · 56°F 664 ft St. Clair
Silver River Near L'Anse, Mi
10 hours ago · USGS 04043150
17 cfs 6.30 ft · 47°F 625 ft Dead-Kelsey
West Fork Portage Creek Near Oshtemo, Mi
10 hours ago · USGS 04106320
16 cfs 1.90 ft · 64°F 875 ft Kalamazoo
North Branch Clinton River Near Mt. Clemens, Mi
9 hours ago · USGS 04164500
16 cfs 4.28 ft · 57°F 584 ft Clinton
Black River Near Bessemer, Mi
11 hours ago · USGS 04031000
16 cfs 1.90 ft · 48°F 1,186 ft Black-Presque Isle
Belle River At Memphis, Mi
10 hours ago · USGS 04160600
16 cfs 1.11 ft · 56°F 713 ft St. Clair
East Branch Pine River Near Tustin, Mi
10 hours ago · USGS 04124500
15 cfs 2.46 ft · 55°F 1,149 ft Manistee
Sturgeon River Near Sidnaw, Mi
9 hours ago · USGS 04040500
13 cfs 3.19 ft · 42°F 1,228 ft Sturgeon
Middle Branch Clinton River At Macomb, Mi
10 hours ago · USGS 04164800
13 cfs 6.12 ft · 57°F 610 ft Clinton
Mill Creek Near Avoca, Mi
10 hours ago · USGS 04159900
12 cfs · · 56°F 714 ft St. Clair
Bear Creek Near Muskegon, Mi
10 hours ago · USGS 04122100
8 cfs 10.74 ft · 59°F 609 ft Muskegon
East Pond Creek At Romeo, Mi
9 hours ago · USGS 04164100
7 cfs 1.13 ft · 56°F 778 ft Clinton
Ecorse River At Dearborn Heights, Mi
10 hours ago · USGS 04168580
6 cfs 2.74 ft · 60°F 611 ft Detroit
Farmers Creek Near Lapeer, Mi
10 hours ago · USGS 04146000
6 cfs 15.22 ft · 56°F 827 ft Flint
Schweitzer Creek Near Palmer, Mi
9 hours ago · USGS 04058200
6 cfs 2.89 ft · 57°F 1,277 ft Escanaba
Black River Near Garnet, Mi
10 hours ago · USGS 04046000
6 cfs 2.39 ft · 65°F 655 ft Brevoort-Millecoquins
Middle Branch Escanaba River At Humboldt, Mi
10 hours ago · USGS 04057800
4 cfs 1.59 ft 55°F 56°F 1,526 ft Escanaba
Sloan Creek Near Williamston, Mi
9 hours ago · USGS 04112000
2 cfs 1.88 ft · 59°F 870 ft Upper Grand
Cisco Branch Ontonagon R At Cisco Lake Outlet, Mi
11 hours ago · USGS 04037500
1 cfs 3.87 ft · 45°F 1,688 ft Ontonagon
🔒 Premium

See every Michigan gauge ranked against normal.

  • Percentile rank & % of median for all 125 gauges
  • 15-day PULSE forecast on every gauge
  • Custom flow alerts & full daily history
Start my free 7-day trial 7-day free trial · cancel anytime
Flow report FAQ

About Michigan streamflow

What are river levels like in Michigan right now?

As of September 20, 2026, Michigan rivers are running at 96% of normal across 125 USGS streamgauges, and the St. Joseph River At Niles is reporting the highest discharge at 2,760 cfs. The full sortable gauge table is below.

Which Michigan river is running highest right now?

As of September 20, 2026, the highest discharge in Michigan is 2,760 cfs on the St. Joseph River At Niles. See the sortable gauge table for the full statewide ranking.

Are Michigan rivers high or low right now?

Compare the statewide percent-of-normal on this page: above 100% means Michigan rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.

Where does the Michigan streamflow data come from?

The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.

What is cfs?

Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.

What does Gauge Height mean?

The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").

How fresh is the Michigan data?

USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.

Can I get a flow alert for a Michigan gauge?

Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.

Is this a substitute for an NWS flood warning?

No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.