First °F Temperature on Record in the Baltics | Weather Extremes | Weather Underground
The °C (°F) temperature observed at Ventspils, Latvia on August 4th was the first News & Blogs; Mobile Apps; Historical Weather · Daily Forecast Flyer A strong surface high pressure centered over Finland and northeast Russia . I checked carefully the hour by hour temperature/dew point relationship and my. Pressure. in. Visibility. 10 miles. Clouds. Mostly Cloudy ft. Overcast Almanac for January 3, Forecast. Average *. Record. Temperature. High. Additional Conditions. Pressure. in. Visibility. 10 miles. Clouds. Clear Almanac for January 4, Forecast. Average *. Record. Temperature. High.
Wind chill is the apparent temperature considering both the temperature and the wind speed.Basic Principles of pressure and temperature
The key below the image shows the corresponding wind chill for each color. Humidity A color-filled contour map showing the current relative humidity.
Relative humidity is the ratio of water vapor contained in the air to the maximum amount of water vapor that can be contained in the air at the current temperature. The key below the image shows the corresponding relative humidity for each color.
Dew Point A color-filled contour map showing the current dew point. The key below the image shows the corresponding dew points for each color. The UV index indicates the strength of the sun's ultraviolet rays that cause sunburn.
The higher the number, the stronger the UV rays coming in contact with your body. The key below the image shows the corresponding UV index and minutes to skin damage at noon for each color.
Satellite Map The current infrared satellite image for the United States. Infrared satellite images indicate the temperature of cloud tops. The cooler the clouds, the brighter the color on the map. Since air temperature generally decreases with increasing altitude, the cooler brighter the clouds, the higher the clouds. Unlike the visible satellite image, infrared satellites work at night. Fronts This map shows the current radar, fronts positions, and areas of high and low pressure for the United States.
Blue fronts are cold fronts, red fronts are warm fronts, alternating red and blue fronts are stationary fronts, and purple fronts are occluded fronts.
Front positions are updated every 3 hours. Snow A color-filled contour map of the current snow depths across the United States. The key below the map shows the corresponding snow depths for each color. The data is taken from a U. Air Force data set that is updated once per day at about 8pm EST. The data appears to have underestimation errors in Michigan's Upper Peninsula.
Flight Rules A map depicting the the flight conditions at each airport that reported in the past 2 hours across the United States.
Visual Flight Rules VFR - the pilot has the responsibility for seeing and avoiding other aircraft, towers, mountains, etc. Generally defined as visibility between 3 and 5 miles, and ceilings between 1, and 3, feet.
The cloud forms in an unstable environment when warm air from the surface rises until it reaches the Lifting Condensation Level LCLwhere the temperature and dewpoint temperature are equal. This is the flat cloud base and depending on the instability of the environment, the cloud will continue to grow vertically, and can eventually become a cumulonimbus or thunderstorm cloud. Cumulus clouds take two forms, which are associated with good cumulus humilis and bad cumulus congests weather.
Cumulus Congestus Large convective cumulus cloud with great vertical growth, usually taller than it is wide, due to its strong updrafts. Congestus is Latin for "piled-up" and usually is associated with precipitation and if instability is strong enough, cumulonimbus and thunderstorm clouds will develop. Most often these clouds are indicative for bad weather. Cumulus Humilis Very small convective cloud, which forms almost immediately when a rising thermal reaches the Lifting Condensation Level LCLor where the temperature drops to equal the dewpoint temperature.
This cloud usually dissipates after a few minutes because the layer just above it is too stable to allow for vertical growth. Most often these clouds are indicative for pleasant weather.
The cusps mark the division between geomagnetic field lines on the sunward side which are approximately dipolar but somewhat compressed by the solar wind and the field lines in the polar cap that are swept back into the magnetotail by the solar wind.
Radiowave absorption in layers in this region can be significantly increased in response to increased ionization associated with solar x-ray flares. Dark gaseous ejections on the Sun visible in Ha. They usually originate from small subflare-like brightenings.
Material is usually seen to be ejected, then decelerate at a gravitational rate, and to flow back to the point of origin. DSDs can occur intermittently for days from an active region. See disappearing solar filament. Dew Point The temperature at which the air temperature must be cooled for water vapor to condense, forming water droplets, fog, or clouds.
Dew Point Temperature The temperature at which the air temperature must be cooled for water vapor to condense, forming water droplets, fog, or clouds.
First 100°F Temperature on Record in the Baltics
Differential Charging The charging of different areas of a spacecraft or satellite to different potentials in response to sunlight, the charged particle environment, and the design and composition of the materials involved. Discharge may occur through arcing and generally is detrimental.
NWS Space Weather Prediction Center Differential Particle Flux The differential particle directional flux j E,w denotes the number of particles of energy E per unit energy interval, per unit area, per unit time, per unit solid angle of observation, passing through an area perpendicular to the viewing direction.
The angle w is the angle between the viewing direction and the local magnetic field. NWS Space Weather Prediction Center Digital Art When the image has been changed such that it longer looks like the original subject matter or incorporates artistic elements, it is considered digital art.
Dip The geomagnetic inclination angle. An irregular, imaginary line around the Earth where the geomagnetic inclination angle is measured to be zero. It lies near the geographic equator. The prominence material is often seen to ascend but can fall into the Sun or just fade. DSFs are probable indicators of coronal mass ejections.
A change in the perceived frequency of a radiated signal caused by motion of the source relative to the observer. NWS Space Weather Prediction Center Double Rainbow A double rainbow is similar to a single rainbow in that it is both an optical and meteorological phenomenon, but the double rainbow portrays the colors in reverse.
Thus, the outer band of red is on the inner band on the second rainbow that forms on the outside. It is a mirror image of the original rainbow, as it reflects off of a body of water. Often under extremely moist atmospheric conditions, the body of water that is reflecting the rainbow is the abundant water droplets in the air.
In the case of a triple rainbow, the colors are reversed once again to that of the original rainbow. Drizzle Light liquid precipitation of small uniform drops falling from stratus clouds. Dry Lightning A term for lightning that develops from a storm that does not produce precipitation, and is the most common cause of natural wildfires. Cumulonimbus and pyrocumulus are capable of producing dry lightning.
This form can take any form of lightning: DSD See dark surge on the disk. It is computed from the H-components at approximately four near-equatorial stations at hourly intervals. At a given time, the Dst index is the average of variation over all longitudes. The reference level is set so that Dst is statistically zero on internationally designated quiet days.
An index of or deeper indicates a storm-level disturbance, and an index of or deeper is associated with middle latitude aurorae. NWS Space Weather Prediction Center Dust devil A strong and long-lived whirlwind that ranges from a half of a meter wide and a few meters tall to more than 10 meters wide and more than 1, meters tall. They are similar to tornadoes in that they form around a vertical rotating column o f air.
However, dust devils form under fair weather conditions where sunny skies heat the surface, which can produce swirling updrafts of air. These frequently develop in the hot and dry desserts. Dynamic Pressure The momentum flux P of the solar wind.
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E region characteristics electron density, height, etc. The ionization in the E layer is caused mainly by x-rays in the range 0. See also sporadic E. In a total eclipse, the solar disk is completely obscured; in a partial eclipse the solar disk is only partly obscured: Less properly, the apparent path of the Sun around the sky during the year.
Instrument on the SOlar Heliospheric Observer. EIT continuously observes the full disk Sun at A current that flows in the ionosphere in the auroral zone. A thin electric current layer in the ionosphere over the dip equator at about to km altitude. An abrupt equalization of electric potentials.
In space, ESD can occur between objects or portions of a single object see differential charging ; ESD may occur locally within a dielectric or cable. The consequences may include material damage, a spacecraft anomaly, phantom commands, disrupted telemetry, and contaminated data. An EFR is a bipolar magnetic region that first produces a small bipolar plage visible in the chromosphere, which may develop an arch filament system and the initial spots of a sunspot group.
An EFR may be isolated from other solar activity or may occur within an active region. NWS Space Weather Prediction Center Ephemeris An astronomical almanac listing solar coordinates and the positions of the Sun and other heavenly bodies at regular intervals in time. The Sun passes through the vernal equinox on about 21 March and through the autumnal equinox on about 22 September. See x-ray flare class. See also disappearing solar filament. For the Earth, an estimate made from NOAA particle measurements of the instantaneous power dissipated daily in a single auroral zone by auroral particle precipitation.
The power ranges from approximately 5 gigawatts during quiet intervals up to more than in very active times. The magnitude of this power input corresponds closely to the level of geomagnetic activity. NWS Space Weather Prediction Center Evaporation Fog The most localized form of fog, usually forming over lakes and rivers, sometime oceans, when the water is warmer than the air above it.
Moisture evaporates from the water and saturates the adjacent layer of air and condenses. This air rises, it evaporates into the dryer air aloft, thus, giving the appearance of a low layer of steam above the water. Evershed Effect Horizontal motion of the solar atmosphere near a sunspot, having velocities of a few kilometers per second.
In the photosphere, matter streams away from the umbra. In the chromosphere, the direction of flow is toward the umbra. NWS Space Weather Prediction Center F corona Of the white-light corona the corona seen by the eye at a total solar eclipsethat portion which is caused by sunlight scattered or reflected by solid particles dust in interplanetary space. The same phenomenon produces zodiacal light. F region electron densities are highly variable, depending on the local time, solar activity, season, and geomagnetic activity.
The F region contains the Fl and F2 layers. The F2 layer is more dense and peaks at altitudes between and km.