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Criteria for the Issuance of Weather Warnings
User’s Guide | Criteria for the Warnings
Criteria for Portugal Mainland
| Warning | Parameter | Yellow | Orange | Red | Units | Notes |
|---|---|---|---|---|---|---|
| Wind | Maximum Gust | 70 to 90 | 91 to 130 | > 130 | km/h | |
| 90 to 110 | 111 to 130 | > 130 | km/h | In the highlands | ||
| Rainfall | Rain/Showers | 10 to 20 | 21 to 40 | > 40 | mm/1h | Milimeters in 1 hour |
| 30 to 40 | 41 to 60 | > 60 | mm/6h | Milimeters in 6 hour | ||
| Snow | Snowfall with accumulation | 1 to 5 | 6 to 15 | > 15 | cm | Quota below 1000 m |
| 1 to 10 | 11 to 30 | > 30 | cm | Quota between 1000 and 1600 m | ||
| 5 to 25 | 26 to 50 | > 50 | cm | Quota above 1600 m | ||
| Thunderstorm | Electric Discharges | a) | b) | c) | a) Frequent and scattered. b) Frequent and close together. c) Very frequent and excessively close together. |
|
| Fog | Visibility | *≥ 48h | *≥ 72h | *≥ 96h | * - duration | |
| High Temperature | Maximum Temperature | # to # * | # to # * | > # * | ºC | * - duration ≥ 48 horas |
| Low Temperature | Minimum Temperature | # to # * | # to # * | < # * | ºC | * - duration ≥ 48 horas |
| Coastal Event | Significant Wave Height | 4 to 5 | 5 to 7 | > 7 | m | |
| 2 to 3 | 3 to 5 | > 5 | m | With swell from Southwest off the southern Algarve coast |
# - Values for each Region in the next table.
| District | Minimum Temperature | Maximum Temperature | ||||
|---|---|---|---|---|---|---|
| Yellow | Orange | Red | Yellow | Orange | Red | |
| Viana do Castelo | -1 to -3 | -4 to -5 | < -5 | 32 to 36 | 37 to 38 | > 38 |
| Braga | -1 to -3 | -4 to -5 | < -5 | 34 to 36 | 37 to 38 | > 38 |
| Porto | 1 to -1 | -2 to -3 | < -3 | 32 to 36 | 37 to 38 | > 38 |
| Vila Real | -2 to -3 | -4 to -5 | < -5 | 34 to 37 | 38 to 39 | > 39 |
| Bragança | -4 to -7 | -8 to -10 | < -10 | 34 to 36 | 37 to 38 | > 38 |
| Viseu | -2 to -4 | -5 to -7 | < -7 | 35 to 38 | 39 to 40 | > 40 |
| Guarda | -3 to -6 | -7 to -10 | < -10 | 31 to 33 | 34 to 36 | > 36 |
| Castelo Branco | 0 to -2 | -3 to -4 | < -4 | 37 to 39 | 40 to 41 | > 41 |
| Aveiro | 3 to 1 | 0 to -1 | < -1 | 31 to 35 | 36 to 38 | > 38 |
| Coimbra | -1 to -3 | -4 to -5 | < -5 | 35 to 38 | 39 to 40 | > 40 |
| Leiria | -1 to -3 | -4 to -6 | < -6 | 31 to 35 | 36 to 40 | > 40 |
| Lisboa | 3 to 1 | 0 to -1 | < -1 | 34 to 37 | 38 to 40 | > 40 |
| Setúbal | 1 to -2 | -3 to -4 | < -4 | 35 to 39 | 40 to 42 | > 42 |
| Santarém | 1 to -1 | -2 to -3 | < -3 | 38 to 41 | 42 to 43 | > 43 |
| Portalegre | 1 to -1 | -2 to -5 | < -5 | 36 to 39 | 40 to 41 | > 41 |
| Évora | 1 to -1 | -2 to -4 | < -4 | 37 to 40 | 41 to 43 | > 43 |
| Beja | 1 a -1 | -2 to -4 | < -4 | 37 to 40 | 41 to 43 | > 43 |
| Faro | 4 to 1 | 0 to -1 | < -1 | 33 to 37 | 38 to 41 | > 41 |
Criteria for Madeira Archipelago
| Warning | Parameter | Yellow | Orange | Red | Units | Notes |
|---|---|---|---|---|---|---|
| Wind | Maximum Gust | 70 to 90 | 91 to 130 | > 130 | km/h | |
| 90 to 110 | 111 to 130 | > 130 | km/h | In the highlands | ||
| Rainfall | Rain/Showers | 10 to 20 | 21 to 40 | > 40 | mm/1h | Milimeters in 1 hour |
| 30 to 40 | 41 to 60 | > 60 | mm/6h | Milimeters in 6 hour | ||
| Snow | Snowfall with accumulation | 1 to 5 | 6 to 15 | > 15 | cm | Quota below 1000 m |
| 1 to 10 | 11 to 30 | > 30 | cm | Quota between 1000 and 1600 m | ||
| 5 to 25 | 26 to 50 | > 50 | cm | Quota above 1600 m | ||
| Thunderstorm | Electric Discharges | a) | b) | c) | a) Frequent and scattered. b) Frequent and close together. c) Very frequent and excessively close together. |
|
| Fog | Visibility | *≥ 48h | *≥ 72h | *≥ 96h | * - duration | |
| High Temperature | Maximum Temperature | # to # * | # to # * | > # * | ºC | * - duration ≥ 48 horas |
| Low Temperature | Minimum Temperature | # to # * | # to # * | < # * | ºC | * - duration ≥ 48 horas |
| Coastal Event | Significant Wave Height | 4 to 5 | 5 to 7 | > 7 | m |
# - Values for each region in the following table.
| Region | Minimum Temperature | Maximum Temperature | ||||
|---|---|---|---|---|---|---|
| Yellow | Orange | Red | Yellow | Orange | Red | |
| Costa Norte | 7 a 8 | 5 a 6 | < 5 | 24 a 26 | 27 a 30 | > 30 |
| Regiões Montanhosas | -2 a -1 | -4 a -2 | < -4 | 25 a 27 | 28 a 29 | > 29 |
| Costa Sul | 10 a 11 | 8 a 9 | < 8 | 27 a 29 | 30 a 35 | > 35 |
| Porto Santo | 10 a 11 | 8 a 9 | < 8 | 26 a 27 | 28 a 31 | > 31 |
Criteria for Azores Archipelago
| Warning | Parameter | Yellow | Orange | Red | Units | Notes |
|---|---|---|---|---|---|---|
| Wind | Mean Wind Speed | 65 - 74 | 75 - 87 | > 87 | km/h | |
| Maximum Gust | 85 to 100 | 101 to 130 | > 130 | km/h | ||
| Rainfall | Rain/Showers | 10 to 20 | 21 to 40 | > 40 | mm/1h | Millimeters in 1 hour |
| 25 to 40 | 41 to 60 | > 60 | mm/6h | Millimeters in 6 hour | ||
| Snow | Snowfall with accumulation | 1 to 5 | 6 to 15 | > 15 | cm | Quota below 1000 m |
| 1 to 10 | 11 to 30 | > 30 | cm | Quota between 1000 and 1600 m | ||
| 5 to 25 | 26 to 50 | > 50 | cm | Quota above 1600 m | ||
| Thunderstorm | Electric Discharges | a) | b) | c) | a) Frequent and scattered. b) Frequent and close together. c) Very frequent and excessively close together. |
|
| Fog | Visibility | *≥ 48h | *≥ 72h | *≥ 96h | * - duration | |
| High Temperature | Maximum Temperature | # to # * | # to # * | > # * | ºC | * - duration ≥ 48 horas |
| Low Temperature | Minimum Temperature | # to # * | # to # * | < # * | ºC | * - duration ≥ 48 horas |
| Coastal Event | Significant Wave Height | 6 to 7 | 7 to 9 | > 9 | m |
# - Values for each Group in the next table.
| Group | Minimum Temperature | Maximum Temperature | ||||
|---|---|---|---|---|---|---|
| Yellow | Orange | Red | Yellow | Orange | Red | |
| Oriental | 8 to 5 | 4 to 0 | < 0 | 28 to 29 | 30 to 31 | > 31 |
| Central | 8 to 5 | 4 to 0 | < 0 | 28 to 29 | 30 to 31 | > 31 |
| Occidental | 8 to 5 | 4 to 0 | < 0 | 28 to 29 | 30 to 31 | > 31 |
Likely impacts per warning
| Warning | Yellow | Orange | Red |
|---|---|---|---|
 Snow |
Disturbance caused by snowfall with accumulation and possible icing (eg, conditioned or restricted roads, damage to structures or trees, impaired local supplies). | Moderate disturbance caused by snowfall with accumulation and possible icing (eg, conditioned or restricted roads, damage to structures or trees, impaired local supplies). | Severe disturbance caused by snowfall with accumulation and possible icing (eg restricted roads, damage to structures or trees, impaired local supplies). |
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