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Current Surface & Near Surface Conditions

(explanation of symbols)

Current Winds Aloft

 

12hr Forecast

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48hr Winds Aloft Forecast

 

72hr Winds Aloft Forecast

84hr Winds Aloft Forecast

 

 

Particles released or injected into the atmosphere, such as through a forest fire, volcanic eruption, chemical spill or even a nuclear attack, will be carried by the jet stream winds hundreds or even thousands of miles, depending on the size and weight of the particles, humidity, temperature and other weather factors. The images above show current and forecast winds for the two major currents which carry weather, and particles, across the U.S. The wind speed is indicated in nautical miles per hour, or knots, which is commonly used for aviation weather. The grid below shows the estimated times for particles, or fallout, to travel various distances based on the jet stream winds. Use the distance calculator link to calculate the distance between points.

 

	Distance		ETA in hours @ wind speed
Statute	Nautical	Kilometers	@ 40kts	@ 50kts	@ 60kts	@ 70kts	@ 80kts	@ 100kts	@ 120kts	@ 150kts
Miles	Miles
100	87	161	2.2	1.7	1.4	1.2	1.1	0.9	0.7	0.6
200	174	322	4	3	3	2.5	2.2	1.7	1.4	1.2
300	261	483	7	5	4	4	3	3	2.2	1.7
400	348	644	9	7	6	5	4	3	3	2.3
500	434	805	11	9	7	6	5	4	4	3
750	652	1207	16	13	11	9	8	7	5	4
1000	869	1609	22	17	14	12	11	9	7	6
1250	1086	2012	27	22	18	16	14	11	9	7
1500	1303	2414	33	26	22	19	16	13	11	9
1750	1521	2816	38	30	25	22	19	15	13	10
2000	1738	3219	43	35	29	25	22	17	14	12
2250	1955	3621	49	39	33	28	24	20	16	13
2500	2172	4023	54	43	36	31	27	22	18	14
2750	2390	4426	60	48	40	34	30	24	20	16
3000	2607	4828	65	52	43	37	33	26	22	17

 

 

 

Forecast Winds/temps aloft

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Note the location of the nearest NWS office

Explanation of fields

Field Offices and more detailed explanations

 

The symbolic form of the forecasts is "DDff+TT" in which "DD" is the wind direction, "ff" the wind speed, and "TT" the temperature.

Wind direction is indicated in tens of degrees (two digits) with reference to true north, and wind speed is given in knots (two digits). Light and variable wind or wind speeds of less than 5 knots are expressed by "9900." Forecast wind speeds of 100 through 199 knots are indicated by subtracting 100 from the speed and adding 50 to the coded direction. For example, a forecast of 250 degrees, 145 knots, is encoded as 7545. Forecast wind speeds of 200 knots or greater are indicated as a forecast speed of 199 knots.

Temperature is indicated in degrees Celsius (two digits) and is preceded by the appropriate algebraic sign for the levels from 6,000 through 24,000 feet. Above 24,000 feet, the sign is omitted since temperatures are negative.

 

 

 

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