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Public Information Statement
Issued: 8:40 AM MDT Aug. 23, 2017 – National Weather Service

... Low rainfall amounts are close to setting new records for
length...
... Updated

Here is an update on low precipitation amounts over north
central Montana.

Helena has had a 44-day stretch with no more than a trace of rain.
This ranks as the 3rd longest period. The longest was a 60-day
stretch from Dec 15 1986 through Feb 12 1987.
For the period from April 1 to September 15, this is the longest of
record. The old record was 38-days starting Sep 10 1880.

The current 44-day period with only a trace ranks as the 7th
longest period with 0.01" or less. The longest period was 69-days
from Dec 15 1986 through Feb 21 1987.
For the period from April 1 to September 15, this is the longest of
record. The old record was 40-days starting Jun 5 1985.

Helena has had 70 consecutive days with an accumulation of 0.25" or
less. This ranks as the 12th longest for such an accumulation. The
longest is a 112-day span starting Nov 15 1930.
For the period from April 1 to September 15, the current 70 day
stretch is the 3rd longest of record. The longest is an 84-day
span starting Sep 1 1964.

Periods of light precipitation have occurred over the past month at
Havre. Because of this, short-term lighter precipitation records are
not in danger of being exceeded. However, they have received just
under 4-inches of precipitation in the 264-day period since Dec 2
2016. This is the 13th longest period with less than 4-inches total
accumulation, and the longest since a 284-day period that started on
Jun 8 2011. The record is 323-days from Jul 4 1943 to may 21 1944.

At Great Falls, only 0.15" has fallen since Jun 15. This 69-day
period, which ranks 9th longest, with only this much rain is the
longest such period since a 74-day period that started Jul 8 1969.
The record longest such period is 86-days from Sep 13 1907 to Dec 7
1907.
For the period from April 1 to September 15, this is the 5th
longest of record.

This is also the longest period with less than one-quarter inch of
rain since a 70-day period that started on Jan 1 2005. The record
longest for less than 0.25" accumulation is a 98-day period from Sep
3 to Dec 9 1953.


840 am MDT Wed Aug 23 2017

... Low rainfall amounts are close to setting new records for
length...
... Updated

Here is an update on low precipitation amounts over north
central Montana.

Helena has had a 44-day stretch with no more than a trace of rain.
This ranks as the 3rd longest period. The longest was a 60-day
stretch from Dec 15 1986 through Feb 12 1987.
For the period from April 1 to September 15, this is the longest of
record. The old record was 38-days starting Sep 10 1880.

The current 44-day period with only a trace ranks as the 7th
longest period with 0.01" or less. The longest period was 69-days
from Dec 15 1986 through Feb 21 1987.
For the period from April 1 to September 15, this is the longest of
record. The old record was 40-days starting Jun 5 1985.

Helena has had 70 consecutive days with an accumulation of 0.25" or
less. This ranks as the 12th longest for such an accumulation. The
longest is a 112-day span starting Nov 15 1930.
For the period from April 1 to September 15, the current 70 day
stretch is the 3rd longest of record. The longest is an 84-day
span starting Sep 1 1964.

Periods of light precipitation have occurred over the past month at
Havre. Because of this, short-term lighter precipitation records are
not in danger of being exceeded. However, they have received just
under 4-inches of precipitation in the 264-day period since Dec 2
2016. This is the 13th longest period with less than 4-inches total
accumulation, and the longest since a 284-day period that started on
Jun 8 2011. The record is 323-days from Jul 4 1943 to may 21 1944.

At Great Falls, only 0.15" has fallen since Jun 15. This 69-day
period, which ranks 9th longest, with only this much rain is the
longest such period since a 74-day period that started Jul 8 1969.
The record longest such period is 86-days from Sep 13 1907 to Dec 7
1907.
For the period from April 1 to September 15, this is the 5th
longest of record.

This is also the longest period with less than one-quarter inch of
rain since a 70-day period that started on Jan 1 2005. The record
longest for less than 0.25" accumulation is a 98-day period from Sep
3 to Dec 9 1953.

1156 am MDT Tue Aug 22 2017

... Low rainfall amounts are close to setting new records for
length...

Here is an update on low precipitation amounts over north
central Montana.

Helena has had a 43-day stretch with no more than a trace of rain.
This now ranks as the 3rd longest period. The longest was a 60-day
stretch from Dec 15 1986 through Feb 12 1987.

The current 43-day period with only a trace ranks as the 7th longest
period with 0.01" or less. The longest period was 69-days from Dec
15 1986 through Feb 21 1987.

Periods of light precipitation have occurred over the past month at
Havre. Because of this, short-term lighter precipitation records are
not in danger of being exceeded. However, they have received just
under 4-inches of precipitation in the 263-day period since Dec 2
2016. This is the 13th longest period with less than 4-inches total
accumulation, and the longest since a 284-day period that started on
Jun 8 2011. The record is 323-days from Jul 4 1943 to may 21 1944.

At Great Falls, only 0.15" has fallen since Jun 15. This 68-day
period, which ranks 9th longest, with only this much rain is the
longest such period since a 74-day period that started Jul 8 1969.
The record longest such period is 86-days from Sep 13 1907 to Dec 7
1907.

This is also the longest period with less than one-quarter inch of
rain since a 70-day period that started on Jan 1 2005. The record
longest for less than 0.25" accumulation is a 98-day period from Sep
3 to Dec 9 1953.


1156 am MDT Tue Aug 22 2017

... Low rainfall amounts are close to setting new records for
length...

Here is an update on low precipitation amounts over north
central Montana.

Helena has had a 43-day stretch with no more than a trace of rain.
This now ranks as the 3rd longest period. The longest was a 60-day
stretch from Dec 15 1986 through Feb 12 1987.

The current 43-day period with only a trace ranks as the 7th longest
period with 0.01" or less. The longest period was 69-days from Dec
15 1986 through Feb 21 1987.

Periods of light precipitation have occurred over the past month at
Havre. Because of this, short-term lighter precipitation records are
not in danger of being exceeded. However, they have received just
under 4-inches of precipitation in the 263-day period since Dec 2
2016. This is the 13th longest period with less than 4-inches total
accumulation, and the longest since a 284-day period that started on
Jun 8 2011. The record is 323-days from Jul 4 1943 to may 21 1944.

At Great Falls, only 0.15" has fallen since Jun 15. This 68-day
period, which ranks 9th longest, with only this much rain is the
longest such period since a 74-day period that started Jul 8 1969.
The record longest such period is 86-days from Sep 13 1907 to Dec 7
1907.

This is also the longest period with less than one-quarter inch of
rain since a 70-day period that started on Jan 1 2005. The record
longest for less than 0.25" accumulation is a 98-day period from Sep
3 to Dec 9 1953.

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