Alert archive / Montana / River Flood Warnings in 2018

River Flood Warning 12, NWS Great Falls, MT

April 20, 2018Blaine County, Montana

NWS Great Falls, MT issued this river flood warning at Apr 20, 2018, 2:30 PM MDT for Blaine County, Montana. It was in force for 29 hr.

The area

The counties it named.

The facts

Issued: Apr 20, 2018, 2:30 PM MDT (20:30 UTC)
Expired: Apr 21, 2018, 7:58 PM MDT
In force: 29 hr
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Flood severity: Minor

County Blaine County, MT

The radar

The Glasgow radar (KGGW), 174 km from the middle of the area, began a volume at 20:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Battle Creek (North-central MT) near Chinook (BCMM8).

Action stage: 9 ft
Minor stage: 10 ft
Moderate stage: 12 ft
Major stage: 14 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 06151500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Great Falls, MT wrote its last area forecast discussion before this river flood warning went out at Apr 20, 11:19 AM MDT, 3 hours 11 minutes earlier.

Area forecast discussion, Apr 20, 11:19 AM MDT, 3 hours 11 minutes before

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The office that day

Everything else NWS Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 2:25 PM MDT	Areal Flood Advisory	TFX	Glacier	5 days

Nearby

River Flood Warnings in Montana, 2018 Every river flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.