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1
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2
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3
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- Radar observations can overshoot precipitation originating in the lower
atmosphere
- The problem of overshoot is worse at locations further from a radar
station and in the winter
- Clarus observations can be combined with radar and satellite to provide
enhance precipitation estimates
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4
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5
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6
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7
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- The Clarus data and the PPAES
model improved the ability to identify precipitation
- The improvements are larger at locations distant from the NexRad station
- The improvements are larger in the winter months and at higher latitude
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8
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9
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- Model Initialization (LAPS)
- Combines data from multiple sources to produce initial estimate for
starting conditions
- This is where Clarus data enters the models
- WRS-ARW Model
- Estimates how starting conditions will evolve over time based on
weather physics and background models
- Clarus impacts on initialization data flow into model forecasts
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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20
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21
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- The Clarus data impacted the LAPS estimates, resulting in estimates that
matched closely to the Clarus observations.
- This impact gets washed out of the surface layer during the first steps
of the model run, when the model is “spinning up”.
- The Clarus data does impact the results once spin up is complete
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Notes
