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| Variable | Description (units) |
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| AVLRecords | The number of 5-minute AVL records (count of records) |
| AVL_Hours | Hours of AVL operations (hours) |
| AfterRecords | The number of 5-minute AVL records from the end of the snow event to the end of the plowing event (count of records) |
| BeforeRecords | The number of 5-minute AVL records from the start of the plow event to the start of the storm event (count of records) |
| Exposure | Calculation for vehicle volume (exposure) |
| FreezingRain | The amount of freezing rain in the storm event (inches) |
| HourPrecipitation | The hourly rate of precipitation (inches/hour) |
| LaneLaps | The amount of truck distance traveled divided by the total roadway distance in the city (lane mile laps) |
| Laps | The amount of truck distance traveled divided by the length of roadways in the city (laps) |
| LnExposure | The natural log of the exposure variable |
| PCPN | Total precipitation (inches) |
| RecordsBefore | The number of 5-minute record counts from before the start of the storm event (count of records, before) |
| RoadCondition | The aggregate road condition for the storm event (1 to 5 categorical, 1 = = least severe conditions, 5 = = most severe conditions) |
| Snow | The total snow in the storm event (inches) |
| StormHours | The number of hours that the storms lasted (hours) |
| StormRecords | The number of 5-minute counts that the storm lasted (count of records) |
| TemperatureFah | The average temperature of the storm (Fahreneit) |
| TemperatureFahASOS | The average temperature of the storm from the ASOS system (Fahreneit) |
| TemperatureFahRWIS | The average temperature of the storm from the RWIS system (Fahreneit) |
| TotalDistLiquid | The total distance of truck travel while spreading liquid material (miles) |
| TotalDistLiquidBefore | The total distance of truck travel while spreading liquid material between the start of the plow event and storm event (miles) |
| TotalDistPrewet | The total distance of truck travel while spreading prewet material (miles) |
| TotalDistPrewetBefore | The total distance of truck travel while spreading prewet material between the start of the plow event and storm event (miles) |
| TotalDistSolid | The total distance of truck travel while spreading solid material (miles) |
| TotalDistSolidBefore | The total distance of truck travel while spreading solid material between the start of the plow event and storm event (miles) |
| TruckDisPerLanMile | The total distance of truck travel divided by the amount of lane miles in each city (miles per lane mile) |
| TruckDisPerLanMileBefore | The total distance of truck travel divided by the amount of lane miles in each city before the start of plow operations (miles per lane mile before) |
| TruckDisPerLanMileMinute | The total distance of truck travel divided by the amount of lane miles in each city divided by the number of minutes of the storm (miles per lane mile per minute) |
| TruckDisPerLanMileMinuteBefore | The total distance of truck travel divided by the amount of lane miles in each city divided by the number of minutes of the storm before the start of the storm event |
| TruckDistMiles | The total truck distance driven (miles) |
| TruckDistMilesBefore | The total truck distance driven before the storm (miles before) |
| TruckLiquidPerLanMile | The total amount of liquid spread divided by the amount of lane miles (gal per mile per lane mile) |
| TruckLiquidPerLanMileBefore | The total amount of liquid spread divided by the amount of lane miles before the storm event (gal per lane mile before) |
| TruckLiquidPerLanMileMinute | The total amount of liquid spread divided by the amount of lane miles divided by the total minutes of the storm (gal per lane mile per minute) |
| TruckLiquidPerLanMileMinuteBefore | The total amount of liquid spread divided by the amount of lane miles divided by the total minutes of the storm before (gal per lane mile per minute before) |
| TruckMaterialLiquid | The total amount of liquid spread (gal) |
| TruckMaterialLiquid.Distance | The total amount of liquid spread divided by the distance traveled (gal/mile) |
| TruckMaterialLiquid.DistanceBefore | The total amount of liquid spread divided by the distance traveled before the storm event (gal/mile) |
| TruckMaterialLiquidBefore | The total amount of liquid spread before the storm (gal before) |
| TruckMaterialLiquidDistance.Distance | The total amount of liquid material spread divided by the distance traveled only while spreading occurred (gal/mile, of spreading miles traveled only) |
| TruckMaterialLiquidDistance.DistanceBefore | The total amount of liquid material spread divided by the distance traveled only while spreading occurred before (gal/mile, of spreading miles before traveled only) |
| TruckMaterialPreLiquid | The total amount of preliquid spread (gal) |
| TruckMaterialPreLiquid.Distance | The total amount of preliquid spread divided by the distance traveled (gal/mile) |
| TruckMaterialPreLiquid.DistanceBefore | The total amount of preliquid spread divided by the distance traveled before (gal/mile before) |
| TruckMaterialSolid | The total amount of material solid spread (lbs) |
| TruckMaterialSolid.Distance | The total amount of solid material spread divided by the total truck distance traveled (lbs/mile) |
| TruckMaterialSolid.DistanceBefore | The total amount of solid material spread divided by the total truck distance traveled before (lbs/mile, before) |
| TruckMaterialSolidBefore | The total amount of solid material spread before the storm (lbs, before) |
| TruckMaterialSolidDistance.Distance | The total amount of solid material spread divided by the truck distance that was traveled only while spreading occurred (lbs/mile, of mile traveled while spreading) |
| TruckMaterialSolidDistance.DistanceBefore | The total amount of solid material spread divided by the truck distance that was traveled only while spreading occurred before the storm (lbs/mile, of mile traveled while spreading, before) |
| TruckPreLiquidPerLanMile | The total amount of preliquid material spread divided by the length of lane miles (gal/lane mile) |
| TruckPreLiquidPerLanMileMinute | The total amount of preliquid material spread divided by the length of lane miles divided by the total minutes of the storm (gal/lane mile per minute) |
| TruckSolidPerLanMile | The total amount of solid material spread divided by the length of lane miles (lbs/lane mile) |
| TruckSolidPerLanMileBefore | The total amount of solid material spread divided by the length of lane miles before the storm (lbs/lane mile, before) |
| TruckSolidPerLanMileMinute | The total amount of solid material spread divided by the length of lane miles divided by the total minutes of the storm (lbs/lane mile per minute) |
| TruckSolidPerLanMileMinuteBefore | The total amount of solid material spread divided by the length of lane miles divided by the total minutes of the prestorm plow operations (lbs/lane mile per minute, before) |
| Visibility | The total visibility (miles) |
| WindGust | The max wind recorded (mph) |
| WindSpeed | The average wind speed (mph) |
| WindSpeedKnots | The average wind speed (knots) |
| WindSpeedKnotsASOS | The average wind speed obtained by the ASOS system (knots) |
| WindSpeedKnotsRWIS | The average wind speed obtained by the RWIS system (knots) |
| WorstFreezingRain | The worst intensity of freezing rain (score of 1–3 categorical variables, 1 = = least severe, 3 = = most severe) |
| WorstRoadCondition | The worst road condition (1 to 5 categorical variables, 1 = = least severe conditions, 5 = = most severe conditions) |
| WorstSnow | The worst snow intensity recorded (score of 1–3 categorical variables, 1 = = least severe, 3 = = most severe) |
| WorstVisibility | The lowest visibility recorded (miles) |
| City | The city location of the storm event (Ames, Des Moines, Council Bluffs, Sioux City, Waterloo, Iowa City, Quad cities, Cedar Falls) |
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