Forecast Maps – Prairie Pest Monitoring Network

Wind Trajectories

Ross Weiss, Owen Olfert, Serge Trudel and prairiepest_admin

Forecast Maps

Wind
trajectories Related to Diamondback Moth (DBM) and Aster Leafhopper
Introductions to the Canadian Prairies in 2015

BACKGROUND: Potential wind events capable
of carrying insect pests from source areas in the USA can be identified by
following trajectories for air parcels through time. High altitude air masses, originating from southern
locations, frequently move northerly to Canadian destinations. Insect pest
species such as Diamondback moth and Aster leafhoppers, traditionally unable to
overwinter above the 49th parallel, can utilize these air masses in the spring
to move north from Mexico and the United States (southern or Pacific
northwest).

Wind trajectory data processing by AAFC-Saskatoon Staff began in April. Reverse
Trajectories track air masses arriving across the prairies back to
their point of origin. Forward Trajectories predict
favourable winds expected to arrive across the Canadian Prairies.

Updated: April 25-27, 2015

1. Reverse
trajectories

a. Pacific
Northwest (PNW) – 49 Reverse trajectories (RTs) were recorded on the Prairies
from northwest USA between April 25-27, 2015.

b. Mexico
and SW USA (SW) – Five locations (4 in MB and 1 in SK) reported RT’s that
originated from southern Texas over this same time frame.

2. Forward trajectories

Nine forward trajectories are predicted to cross the
prairies from Mexico and the USA over the next five days.

Wind Trajectories

Ross Weiss, Owen Olfert, Serge Trudel and prairiepest_admin

Forecast Maps

Wind trajectories Related to Diamondback Moth (DBM) and Aster Leafhopper Introductions

Wind trajectory data processing by AAFC-Saskatoon Staff began in April. Reverse Trajectories track air masses arriving across the prairies back to their point of origin. Forward Trajectories predict favourable winds expected to arrive across the Canadian Prairies.

Updated: April 21, 2015

1. Reverse trajectories
a. Pacific Northwest (PNW) – Nothing to report.
b. Mexico and SW USA (SW) – Nothing to report.

2. Forward trajectories

Three forward trajectories, all from NW USA, are predicted to cross the prairies over the next five days.

Forward Trajectory Count Dates
Location ID	Initial Date
BOZEMAN_MONTANA	21/04/2015
EASTERN_WASHINGTON	21/04/2015
MOSCOW_IDAHO	21/04/2015

Wind Trajectories

Ross Weiss, Owen Olfert, Serge Trudel and prairiepest_admin

Forecast Maps

1. Reverse trajectories
There
were 24 locations in western Canada that had winds originating from
northwestern USA on April 15, 2015. No reverse trajectories originating
from Mexico and southern USA.

2. Forward trajectories
Forward
wind trajectories, originating from northwestern USA and southern USA/Mexico,
are predicted to cross the prairies within the next five days.

Forward Trajectory Count Dates
Location ID	Count Dates
EASTERN_WASHINGTON	12
BOZEMAN_MONTANA	12
MOSCOW_IDAHO	11
SANTA_MARIA_CALIFORNIA	5
MANHATTAN_KANSAS	5
MEXICALI_MEXICO	2
IMPERIAL_VALLEY_CALIFORNIA	2
WESLACO_TEXAS	1
LOUISIANA	1

Wind Trajectories

Ross Weiss, Owen Olfert, Serge Trudel and prairiepest_admin

Forecast Maps

Wind trajectories
Related to Diamondback Moth (DBM) and Aster Leafhopper Introductions

BACKGROUND: Potential wind events capable of carrying insect
pests from source areas in the USA can be identified by following trajectories
for air parcels through time. High altitude air masses, originating
from southern locations, frequently move northerly to Canadian destinations.
Insect pest species such as Diamondback moth and Aster leafhoppers,
traditionally unable to overwinter above the 49th parallel, can utilize these
air masses in the spring to move north from Mexico and the United States
(southern or Pacific northwest). Data acquired from Environment Canada is
compiled by Olfert et al. (AAFC-Saskatoon) to track and model high altitude air
masses in the spring with respect to potential introductions of insect pests
onto the Canadian prairies. Each week, backward and forward trajectories
are examined with respect to source and destination in the following manner. The
forward trajectories are prognostic (5 days into the future) based on forecast
wind fields while the backward trajectories are diagnostic and based on
analyzed wind fields (5 days previous).

FOR THE WEEK OF APRIL 3-7, 2015: Wind trajectory data processing by AAFC-Saskatoon Staff began in April. Reverse Trajectories track arriving air masses back to their point of origin while Forward Trajectories predict favourable winds expected to arrive across the Canadian Prairies for the week of April 3-7, 2015:

Reverse trajectories (RT)

Pacific
Northwest (PNW) – The number of reverse trajectories from Prairie locations
with links to the PNW continues to be relatively high. the following 25 locations had RT’s,
originating from the PNW, that crossed the prairies on April 1 and 2, 2015. Of
particular interest were the northern AB locations reported for April
7.

Reverse Trajectories Originating from PNW Arriving at Prairie Locations
Location ID	Arriving Date (dd-m-year)	Latitude	Longitude
WANHAM_AB	07/04/2015	55.7	-118.4
VEGREVILLE_AB	07/04/2015	53.5	-112
SEDGEWICK_AB	07/04/2015	52.8	-111.7
RYCROFT_AB	07/04/2015	55.8	-118.7
REGINA_SK	07/04/2015	50.5	-104.5
PROVOST_AB	07/04/2015	52.4	-110.3
OLDS_AB	07/04/2015	51.8	-114.1
LETHBRIDGE_AB	07/04/2015	49.7	-112.8
KINDERSLEY_SK	07/04/2015	51.5	-109.1
GRENFELL_SK	07/04/2015	50.4	-102.9
GRANDE_PRAIRIE_AB	07/04/2015	55.2	-118.8
GAINSBOROUGH_SK	07/04/2015	49.2	-101.4
FORT_VERMILION_AB	07/04/2015	58.4	-116
BEISEKER_AB	07/04/2015	51.4	-113.5
ANDREW_AB	07/04/2015	53.9	-112.3
VEGREVILLE_AB	06/04/2015	53.5	-112
SEDGEWICK_AB	06/04/2015	52.8	-111.7
OLDS_AB	06/04/2015	51.8	-114.1
LETHBRIDGE_AB	06/04/2015	49.7	-112.8
GRANDE_PRAIRIE_AB	06/04/2015	55.2	-118.8
BEISEKER_AB	06/04/2015	51.4	-113.5
LETHBRIDGE_AB	05/04/2015	49.7	-112.8
KINDERSLEY_SK	05/04/2015	51.5	-109.1
BEISEKER_AB	05/04/2015	51.4	-113.5
LETHBRIDGE_AB	04/04/2015	49.7	-112.8

Forward Trajectories (FT)
Forward trajectories originating from the following locations are predicted to cross the prairies within the next five days:

Forward Trajectory source locations predicted to cross the Canadian prairies
Location ID	Initial Date (dd-m-year)
BOZEMAN_MONTANA	07/04/2015
EASTERN_WASHINGTON	07/04/2015
IMPERIAL_VALLEY_CALIFORNIA	07/04/2015
MEXICALI_MEXICO	07/04/2015
MOSCOW_IDAHO	07/04/2015
BOZEMAN_MONTANA	06/04/2015
EASTERN_WASHINGTON	06/04/2015
LOUISIANA	06/04/2015
MANHATTAN_KANSAS	06/04/2015
MOSCOW_IDAHO	06/04/2015
SANTA_MARIA_CALIFORNIA	06/04/2015
BOZEMAN_MONTANA	05/04/2015
EASTERN_WASHINGTON	05/04/2015
MANHATTAN_KANSAS	05/04/2015
EASTERN_WASHINGTON	04/04/2015
MANHATTAN_KANSAS	04/04/2015
MOSCOW_IDAHO	04/04/2015
EASTERN_WASHINGTON	03/04/2015
MOSCOW_IDAHO	03/04/2015

The April 6 forward trajectory from Santa Maria, California, is
predicted to cross over southern Alberta on April 11. The forward trajectory from
Mexicali should cross southern Manitoba about April 8. The Imperial Valley trajectory is
predicted to cross southern Manitoba on April 9.
Though the prairies were forecasted to expect snow (April 7), conditions are
predicted to warm up over the next few days.

Forecast for Lethbridge:

http://weather.gc.ca/city/pages/ab-30_metric_e.html

Forecast for Winnipeg:

http://weather.gc.ca/city/pages/mb-38_metric_e.html

2015 - Forecast Maps

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