Flood Potential Outlook Issued by NWS Grand Forks, ND
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FGUS73 KFGF 151709
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MNC005-007-027-029-051-057-069-077-087-089-107-111-113-119-125-
135-159-167-NDC003-005-017-019-027-035-039-063-067-071-073-077-
081-091-095-097-099-281200-
PROBABILISTIC HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS ND
1109 AM CST Thu Feb 15 2024
Reissued to correct headline...
...SPRING FLOOD AND WATER RESOURCES OUTLOOK...
...RED RIVER BASIN OUTLOOK FOR RIVER FLOOD POTENTIAL...
This outlook covers the Red River of the North
and its Minnesota and North Dakota tributaries.
...MINOR TO ISOLATED MODERATE FLOODING IS EXPECTED FOR SOME LOCATIONS
IN THE RED RIVER OF THE NORTH BASIN...
* This 90-day outlook covers the period from 2/19/2024 to 5/19/2024.
.OUTLOOK SUMMARY...
* Probabilities for exceeding Major, Moderate, Minor Flood Stage...
Major Flooding...
There is a low risk (less than 35 percent chance) of major
flooding across the basin.
Moderate Flooding...
There is a medium risk (35 to 65 percent chance) of moderate
flooding at Fargo/Moorhead and Oslo on the Red River. In North
Dakota, there is a medium risk of moderate flooding at Abercrombie on
the Wild Rice River.
There is a low risk (less than 35 percent chance) of moderate
flooding elsewhere across the basin.
Minor Flooding...
There is a high risk (greater than 65 percent chance) of minor
flooding at Fargo/Moorhead, Grand Forks/East Grand Forks, and Oslo on
the Red River. In North Dakota, there is a high risk of minor
flooding at Abercrombie on the Wild Rice River. In Minnesota, there
is a high risk of minor flooding at Dilworth on the Buffalo River.
There is a medium risk (35 to 65 percent chance) of minor flooding
at Wahpeton, Halstad, Drayton, and Pembina on the Red River. In North
Dakota, there is a medium risk of minor flooding at Mapleton on the
Maple River. In Minnesota, there is a medium risk of minor flooding
at Sabin on the South Branch Buffalo River, Hendrum on the Wild Rice
River, and Hallock on the Two Rivers River.
There is a low risk (less than 35 percent chance) of minor
flooding elsewhere across the basin.
.OUTLOOK DISCUSSION...
Hydrologic and climate conditions which affect each of the several
factors that significantly determine the timing and magnitude of
spring snowmelt flooding within the Red River of the North are
discussed below:
* FALL AND WINTER PRECIPITATION AND SOIL MOISTURE...
Overall both fall and winter precipitation have been below normal
for much of the basin. Soil moisture remains much lower than normal
across the northern third of the basin with moderate to severe
drought conditions while near average elsewhere.
* RIVER FLOWS...
At the end of December, base streamflows were flowing near to
slightly higher than normal on the Red River mainstem and its
tributaries.
* FROST DEPTHS...
January cold formed a deeper frost layer across much of the basin.
However, early February warmth allowed for some thawing to begin,
especially in the south. Lake/river observations indicate ice cover
is thinner and less consistent than normal due to mild temperatures.
* SNOWPACK CONDITIONS...
The current snowpack and associated water content is much below
normal. Since December 1, 2023, snowfall has been running roughly 10
to 50 percent of normal, lowest across the southern two-thirds of the
basin. Little to no snow cover (and associated water content) remains
in place with the exception of near the international border.
* FACTORS YET TO BE DETERMINED...
- Further snowpack growth,
- Rate of snowmelt/thaw,
- Heavy rain on snow or frozen ground during thaw or peak flood,
- Heavy rain on ice-covered rivers causing short-term ice jams.
* SHORT TERM WEATHER FORECAST...
Dry conditions with overall above above normal temperatures are
expected to continue for the remainder of February.
* LONG TERM CLIMATE OUTLOOK...
Climate outlooks indicate above normal temperatures into spring.
This will allow for early melting of any remaining snowpack and
introduce the possibility of rain instead of snow through early
spring.
.NEXT SPRING FLOOD OUTLOOK...
The next 2024 spring flood outlook will be issued on Thursday,
February 29, 2024.
.FLOOD OUTLOOK PROBABILITIES TABLES...
The following message has two sections: the first gives the
current and normal/historical chances of river locations reaching
their minor, moderate, and major flood category. The second
gives the current chances of river locations rising above river
stages listed.
...Red River Long-Range Probabilistic Outlook by Flood Category...
Valid from February 19, 2024 to May 19, 2024
In Table 1 below, the current (CS) and historical (HS), or normal,
probabilities of exceeding minor, moderate, and major flood stages
are listed for the valid time period.
CS values indicate the 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 CS is greater than HS, the probability of
exceeding that level is higher than normal. When the value of CS 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: 02/19/2024 - 05/19/2024
: Current and Historical
: Chances of Exceeding
: Flood Categories
: as a Percentage (%)
Categorical :
Flood Stages (FT) : Minor Moderate Major
Location Minor Mod Major : CS HS CS HS CS HS
-------- ------ ------ ------ : --- --- --- --- --- ---
Red River of the North.....
WAHPETON 11.0 13.0 15.0 : 64 59 25 30 <5 17
HICKSON 30.0 34.0 38.0 : 21 27 <5 13 <5 <5
FARGO 18.0 25.0 30.0 : >95 83 46 40 25 26
HALSTAD 26.0 32.0 37.5 : 44 38 17 21 <5 12
GRAND FORKS 28.0 40.0 46.0 : 65 57 21 30 <5 11
OSLO 26.0 30.0 36.0 : 74 63 64 56 6 18
DRAYTON 32.0 38.0 42.0 : 50 46 26 32 <5 12
PEMBINA 39.0 44.0 49.0 : 53 52 30 43 5 22
: Current and Historical
: Chances of Exceeding
: Flood Categories
: as a Percentage (%)
Categorical :
Flood Stages (FT) : Minor Moderate Major
Location Minor Mod Major : CS HS CS HS CS HS
-------- ------ ------ ------ : --- --- --- --- --- ---
Minnesota Tributaries.....
Note: The Roseau numbers consider the flow through its diversion
SABIN 13.0 15.0 19.0 : 54 60 11 17 <5 <5
HAWLEY 8.0 9.0 11.0 : 28 39 12 25 <5 <5
DILWORTH 13.0 20.0 26.0 : 75 69 16 21 <5 <5
TWIN VALLEY 10.0 12.0 14.0 : 10 17 <5 8 <5 <5
HENDRUM 20.0 28.0 32.0 : 60 51 14 21 <5 7
SHELLY 14.0 20.0 23.0 : 18 28 <5 11 <5 6
CLIMAX 20.0 25.0 30.0 : 11 23 <5 12 <5 8
HIGH LANDING 12.0 12.5 13.0 : <5 12 <5 9 <5 7
CROOKSTON 15.0 20.0 23.0 : 32 48 7 24 <5 9
ABOVE WARREN 67.0 71.0 75.0 : 5 11 <5 <5 <5 <5
ALVARADO 106.0 108.0 110.0 : 24 23 7 16 <5 <5
HALLOCK 802.0 806.0 810.0 : 50 62 15 39 <5 10
ROSEAU 16.0 18.0 19.0 : <5 21 <5 13 <5 8
: Current and Historical
: Chances of Exceeding
: Flood Categories
: as a Percentage (%)
Categorical :
Flood Stages (FT) : Minor Moderate Major
Location Minor Mod Major : CS HS CS HS CS HS
-------- ------ ------ ------ : --- --- --- --- --- ---
North Dakota Tributaries.....
ABERCROMBIE 20.0 22.0 28.0 : 71 42 55 34 16 19
VALLEY CITY 15.0 16.0 17.0 : <5 10 <5 7 <5 6
LISBON 15.0 17.0 19.0 : <5 11 <5 10 <5 7
KINDRED 16.0 19.0 20.5 : 8 20 5 11 <5 10
WEST FARGO DVRSN 18.0 20.0 21.0 : 5 12 <5 11 <5 10
HARWOOD 84.0 86.0 91.0 : 27 26 20 21 7 10
ENDERLIN 9.5 12.0 14.0 : 34 26 8 11 <5 <5
MAPLETON 18.0 21.0 23.0 : 56 35 22 17 <5 5
HILLSBORO 10.0 13.0 16.0 : 14 19 <5 10 <5 <5
MINTO 6.0 8.0 11.0 : 9 24 <5 7 <5 <5
WALHALLA 11.0 16.0 18.0 : <5 21 <5 <5 <5 <5
NECHE 18.0 19.0 20.5 : <5 27 <5 26 <5 20
LEGEND:
CS = Conditional Simulation (Outlook for current conditions)
HS = Historical Simulation ( " " normal conditions)
FT = Feet (above gage zero datum)
...Red River Long-Range Probabilistic Outlook by River Stage...
Valid from February 19, 2024 to May 19, 2024
LOCATION 95% 90% 75% 50% 25% 10% 05%
-------- ------ ------ ------ ------ ------ ------ ------
Red River of the North.....
WAHPETON 8.5 9.7 10.6 11.6 13.0 14.4 14.9
HICKSON 15.7 17.0 20.4 23.7 28.8 32.1 32.9
FARGO 18.2 19.2 21.1 24.7 30.1 33.3 35.0
HALSTAD 14.5 15.6 18.2 24.7 29.1 34.8 37.0
GRAND FORKS 20.5 21.1 23.0 33.3 37.8 42.1 45.2
OSLO 18.4 19.6 22.8 33.0 34.4 35.4 36.8
DRAYTON 19.8 20.5 23.7 32.1 38.1 40.1 41.3
PEMBINA 26.0 26.7 32.6 39.1 45.8 48.0 49.8
Minnesota Tribs: 95% 90% 75% 50% 25% 10% 05%
-------- ------ ------ ------ ------ ------ ------ ------
South Fork Buffalo River.....
SABIN 10.1 10.8 12.1 13.2 14.2 15.3 15.5
Buffalo River.....
HAWLEY 5.7 5.8 6.4 7.4 8.2 9.2 9.8
DILWORTH 10.3 11.3 13.0 16.6 18.4 21.0 21.8
Wild Rice River.....
TWIN VALLEY 4.2 4.5 5.1 6.5 7.5 9.7 10.7
HENDRUM 12.6 13.9 16.5 21.7 25.3 29.2 30.0
Marsh River.....
SHELLY 6.2 6.3 7.7 9.4 11.7 16.1 19.4
Sand Hill River.....
CLIMAX 7.6 7.7 9.0 11.8 16.0 20.8 24.1
Red Lake River.....
HIGH LANDING 4.0 4.1 4.5 5.7 6.7 8.7 9.3
CROOKSTON 8.7 9.0 10.5 12.9 15.6 18.3 21.3
Snake River.....
ABOVE WARREN 62.7 62.9 63.2 63.8 64.7 66.0 67.2
ALVARADO 99.4 99.8 100.6 102.7 105.9 107.5 109.1
Two Rivers River.....
HALLOCK 797.2 798.3 800.1 802.1 804.5 807.5 807.9
Roseau River..... considering the flow through the Roseau diversion
ROSEAU 7.9 8.2 9.1 10.4 11.9 14.5 15.7
North Dakota Tribs: 95% 90% 75% 50% 25% 10% 05%
-------- ------ ------ ------ ------ ------ ------ ------
Wild Rice River.....
ABERCROMBIE 16.2 16.4 19.8 22.9 27.2 29.4 31.9
Sheyenne River.....
VALLEY CITY 5.2 5.6 6.4 7.5 8.9 11.5 12.2
LISBON 4.3 4.8 5.8 6.9 8.6 11.1 12.9
KINDRED 6.5 6.8 7.9 9.5 11.7 14.8 19.1
WEST FARGO DVRSN 9.1 9.6 10.8 10.9 13.0 15.1 18.6
HARWOOD 74.6 75.6 77.1 79.9 84.4 89.8 91.6
Maple River.....
ENDERLIN 5.2 6.0 6.9 8.2 9.7 11.2 12.8
MAPLETON 12.7 13.1 15.9 19.1 20.8 21.9 22.6
Goose River.....
HILLSBORO 3.5 3.6 4.3 5.5 7.5 10.5 12.2
Forest River.....
MINTO 2.2 2.3 2.5 3.0 4.2 5.9 6.9
Pembina River.....
WALHALLA 2.8 3.0 3.5 4.1 5.1 6.7 7.9
NECHE 4.3 4.8 5.5 6.9 9.2 13.1 15.5
.THE OUTLOOK PRODUCTION PROCESS...
This long range probabilistic outlook is based on a series of peak
river levels or crests taken from the forecast hydrograph results
of the NWS Community Hydrologic Prediction System (CHPS). The model
is run for multiple scenarios starting at current river levels and
soil conditions using 69 years (1949-2018) of past precipitation
and temperature conditions that were experienced for those past
years during the time-frame of the outlook period. These crests can
then be ranked from lowest to highest and assigned an exceedance
probability. For example, for a series of 50 years, the lowest
ranked crest has 49 crests above it and since 95 percent of the
crests are above it, it is assigned a 95 percent probability
of exceedance (POE).
A YouTube video on "How to Interpret River Outlook Products" is at:
www.youtube.com/watch?v=pSoEgvsnpv4
The probabilities can be used for risk management by using them as
an indication of the range of crests that may be expected during
the valid period of the outlook. By providing a range of peak river
level probabilities, the NWS is contributing to the area`s Decision
Support Services that help with long-range flood planning and
response readiness. This outlook is a part of NOAA`s National
Weather Service`s AHPS (Advanced Hydrologic Prediction Services).
.ADDITIONAL INFORMATION SOURCES...
The AHPS Long-Range Probabilistic Hydrologic Outlooks are issued
each month typically between the first and second Friday after
mid-month. However, Spring Flood and Water Resources Outlooks are
issued several times leading up to the spring melt period, usually
on Thursdays beginning in late February or early March and ending
in early April, depending on the spring flooding conditions.
This outlook is also presented as graphs of the probability of stage
exceedance for the full period and for weekly intervals during the
period. These graphs, along with explanations for interpreting them,
are available from the NWS Grand Forks AHPS web page:
www.weather.gov/grandforks or weather.gov/fgf
then click on the "Rivers and Lakes" tab above the map.
Current river conditions for all river forecast points in the Red
River of the North and Devils/Stump Lake basins are also available
on our website, as well as 7-day forecasts when river levels at
forecast points are in or near flood.
Additional Probabilistic Hydrologic Outlooks will be issued monthly
throughout the rest of the year during the later part of the month
or as conditions warrant.
Refer to the separate Devils Lake Probabilistic Hydrologic Outlook
for Devils and Stump Lakes Probability of Exceedance levels and
low-water non-exceedance levels.
If you have any questions, contact the NWS at 701-772-0720.
You can follow us on Facebook at: www.facebook.com/NWSGrandForks
and on Twitter at: @NWSGrandForks.
$$
www.weather.gov/fgf
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