JUNE 2009



1ST-6thThe Eastern U.S. continued to see areas of severe weather development on Tuesday. A trough extended from a low pressure system in eastern Canada, which pulled dry air in from the north, while high pressure in the Mid-Atlantic pushed warm and moist air in from the Gulf. These systems created a strong frontal boundary in the Central U.S. that extended from New England, down the Ohio River Valley, and into the Central Plains. This front kicked up light scattered showers with periods of heavy downpours in areas of thunderstorms development. Strong winds, hail, and tornadoes were also associated with this front. Wilmington, Delaware reported 52 mph sustained winds with gusts up to 76 mph and hail up to one inch in diameter was reported at High Ridge, Missouri. In Dodge City, Kansas, a tornado touched ground and kicked up some dust before it dissipated after 45 seconds. In the South, a small trough triggered periods of heavy rain and thunderstorms over the Lower Mississippi River Valley. Winds gusted up to 73 mph in Central Garden, Texas and a tornado touched ground in Henry, Louisiana. The southern tip of Florida also saw scattered showers and thunderstorms on Tuesday. In the West, a low pressure system over the Pacific Northwest and Northern Rockies kicked up cloudy skies and light showers with rainfall totals less than a tenth of an inch. The rest of the West Coast saw a few clouds with seasonable temperatures in the 70s and 80s.


7-13thStrong storms developed around a potent low pressure system that lifted into the Great Lakes on Monday. The system was accompanied by a quasi-stationary front that extended from the upper Great Lakes to the Mid-Atlantic Coast and a cold front that stretched from the Mid-Mississippi Valley to the Southern Plains. Abundant moisture availability and enhanced instability across these regions led to bands of showers and thunderstorms throughout the day. Stronger storms across southwestern Illinois, southern Wisconsin, southern Michigan, western Indiana, and along the Central and Southern Appalachians consisted of heavy rainfall, strong gusty winds, and episodes of penny to ping pong sized hail (0.75 to 1.50 inches in diameter). These areas were placed under slight risk for severe weather development. In the West, afternoon heating combined with waves of energy along a frontal boundary that extended through the Northern and Central Rockies to produce high elevation storms across the Intermountain West and the Central High Plains. Atmospheric conditions across northeastern Colorado and southwestern Wyoming became favorable for possible severe weather development. Meanwhile, scattered showers and thunderstorms continued to pop up across the southern half of the Florida Peninsula as moist, southeast flow streamed across the region.

Once again, severe weather developed along a stationary front that divided the country into two separate air masses on Friday. The front stretched from New England, down the Ohio River Valley, and into the Southern Plains and was fed with warm and moist Gulf air, which allowed for scattered shower and thunderstorms development. Due to small troughs of low pressure moving over this front at higher levels, some areas of storms turned severe, specifically over northern Texas and the Tennessee Valley, with periods of heavy rain. Quarter size hail was reported in Snyder, Texas and strong winds manage to blow down 4 to 5 inch diameter tree branches in Wellington, Texas. Large hail and strong winds also caused damage in Virginia and Tennessee. As this front has hovered over the region for the last couple of days, continuous rain has caused flooding problems over the Mid-Mississippi and Ohio River Valleys.

Meanwhile to the north, a weak front moved through the Northern Plains and quickly produced severe thunderstorms. Heavy rain was reported with 0.43 inches in one hour in Gering, Nebraska, while strong winds and hail also hit the region. Three tornadoes were spotted in the region, one in Hawk Springs, Wyoming and two in the county of Scotts Bluff, Nebraska.

In the West, a trough of low pressure brought cool conditions to the West Coast on Friday. The Pacific Northwest saw light rain with highs in the 60s, while most of northern California saw overcast skies and saw high temperatures in the 60s and 70s.


14th-20thSevere weather popped up again in the Central Plains on  Wednesday due to a strong low pressure system that developed over the Central Rockies. The system produced a warm front that extended over the Central Plains and into the Mid-Mississippi Valley. In addition to strong flow from the South that pulled in moist Gulf air, this front had favorable conditions for scattered showers and thunderstorm development. A tornado was reported along the Nebraska and Kansas border, with reports of broken windshields from large hail over Odell, Nebraska. The eastern edge of this front saw heavier rainfall with a total of 0.77 inches reported in Anawalt, West Virginia and a wall cloud associated with a thunderstorm produced heavy rain and golf ball size hail in Williamsburg, Kentucky. South of this front, high pressure hovered over the Gulf on Wednesday. This brought warm and humid weather with mostly sunny skies and highs in the 90s and 100s to most of the Gulf states. Out West, seasonable weather returned to the West Coast as high pressure built over the region and the low pressure trough moved over the Rockies. The Pacific Northwest saw lingering clouds but rain has not been reported. As the trough advanced eastward, cloudy skies with light and scattered showers initiated over the Intermountain West.

Wet weather was triggered in various areas of the eastern half of the US on Thursday. In the New England, a high-level low pressure system continued tracking northeastward and kicked up constant showers and thunderstorms throughout the day. Periods of heavy rain fell in some areas with 1.14 inches of rain reported in Lenox, Massachusetts. A cold front extended south from this system and hovered over the Ohio River Valley. This front had much available moisture at the surface, which allowed for scattered showers and thunderstorms with light rain over most of the Tennessee Valley and Mid-Atlantic states. Some of these storms turned severe with nickel size hail reported in Knoxville, Tennessee. Meanwhile, strong and damaging winds blew a porch into the yard with many nearby trees down in Alcorn, Kentucky. To the west, a low pressure system that moved through the Central Plains pulled warm and moist air in from the Gulf, which created a strong warm front. This front tracked northward over the Central Plains and Mid-Mississippi Valley and moved into the Northern Plains and Upper Midwest, which triggered some severe thunderstorms with periods of heavy rainfall. Coulee, North Dakota reported 1.25 inches of rain, while Urbank, Minnesota reported lots of golf ball size hail. South of this system, the Southern Plains and Southeast warm and mild weather as high pressure hovered over the Gulf of Mexico. This allowed for temperatures to reach into the 90s and 100s in many places. Humid conditions in Florida allowed for afternoon shower and thunderstorm development, some of which turned severe. Nickel size hail was reported in Chiefland, Florida. Out West, high pressure built in from the Pacific and brought warm and dry conditions to the Pacific Northwest and California. High level moisture moved into the Southwest and kicked up a few scattered clouds with light and scattered showers.

A couple areas of active weather moved through the country on Saturday. First, a low pressure system moved through the Great Lakes on its way into the Northeast. This system produced considerable precipitation in those areas as well as in the Ohio Valley as the associated cold front instigated rain and thunderstorms. Rain brought another wet day to the U.S. Open Golf Tournament. Second, another low pressure system moved out of the Rockies and into the Plains. This system produced additional moderate rain along with some thunderstormsin the Plains. The precipitation associated with this feature gradually spread out in the Plains in the afternoon. Third, a long front moved through the Intermountain West and Great Basin. Since it did not carry much moisture, only scattered showers fell from Nevada through Montana. The West Coast remained dry and mild as coastal clouds kept the immediate coast cool.

Warm conditions continued in the Southeast as temperatures rose into the 90s and some 100s. The Northeast rose into the 70s, while the Southern Plains saw temperatures in the 80s and 90s. The Northwest rose into the 60s and 70s.

Severe weather developed in the Tennessee Valley and Southeast as well as the Upper Midwest on Monday. A low pressure system moved off the East Coast, while another low pressure system moved eastward through Canada. These systems together created a frontal boundary that hovered over the center of the country. The south end of this system created a cold front that hovered over the Southeast and Tennessee Valley, where it turned into a warm front that extended into the Upper Midwest. Both systems produced periods of heavy rain, large hail, and strong winds. Strawberry Plains, Tennessee reported 1.23 inches of new rainfall, while strong winds blew down several trees and power lines across Kentucky, Tennessee, and Georgia. To the north, 2.25 inch hail dented cars in Seward, Nebraska. In the Northeast, the low pressure system kicked up overcast skies with strong winds, but severe weather has not yet been reported. South Barr, Massachusetts reported 17 mph winds with gust up to 32 mph accompanied by fog and light rain. In the Southern Plains, a ridge of high pressure dominated Monday's weather and brought hot and dry conditions. Many areas reached into the 90s and 100s. Out West, a trough of low pressure moved over the Pacific Northwest and pushed scattered clouds over the region while it also created an offshore flow over northern California. This allowed for warm and dry conditions over most of the state with highs in the 80s and 90s. Southern New Mexico saw high level scattered showers and thunderstorms, which have not turned severe.


21-27thA pair of fronts pressed through the northern half of the country and produced much of its active weather. The first cold front moved through the Ohio Valley and into the Northeast. While there was not a lot of moisture associated with this feature, areas of scattered showers and thunderstorms moved through New England. Much of the area was under Severe Thunderstorm Watches into the late afternoon due to these intense thunderstorms and the threat of more to come. Additional thunderstorms developed along the Southeast Coast but were very scattered. Also in the East, extremely warm conditions continued in the Southern Plains and Southeast. Heat indices rose well into the triple digits and triggered Heat Advisories from the Plains through the Middle Mississippi Valley.

The second front to bring active weather to the country dragged through the Northern Rockies and into the Northern Plains. This feature produced areas of rain from the Great Basin through North Dakota. The Rockies also experienced some scattered precipitation. The Northeast rose into the 70s and 80s, while the Southeast saw temperatures into the 90s. The Southern Plains rose into the 90s and 100s, while the Northern Plains saw temperatures into the 80s. The Northwest rose into the 60s and 70s.


28th-30thThe Southeast saw active weather on Monday due to a stationary front that hovered over the region. A low pressure system moving through the Great Lakes created a strong frontal boundary that extended down the East Coast and into the Southeast. This system pulled in some moisture from the Gulf and allowed for many scattered showers and thunderstorms to develop along the front. Light rain was associated with this system, with short periods of heavy down pours in areas of thunderstorm development. No hail or tornadoes have been reported, but strong winds blew down multiple trees and power lines in eastern Texas and the panhandle of Florida. Heat advisories remained in effect for these areas as temperatures peaked near 100 degrees. Flauvanna, Texas reported 0.80 inches of rainfall and 18 mph winds with gusts up to 43 mph. To the north, the low pressure system brought light and scattered rainfall to the Great Lakes region, while the front approached New England throughout the day. The front kicked up mostly cloudy skies which squeezed out a few light showers. These storms have not yet turned severe. Behind this system, the Northern and Central Plains saw breezy conditions as the system passed. Minneapolis, Minnesota reported 17 mph winds with gusts up to 26 mph. Meanwhile, out West, a tropical warm and moist airmass remained over the Southwest. This allowed for overcast skies with scattered thunderstorm development over Arizona and New Mexico. High pressure over the West Coast brought another day of mostly sunny skies and hot temperatures.

Severe weather hit the Northeast on Tuesday as a front hovered over the region. A low pressure system slowly moved over the Great Lakes and created a cold front that extended from the Northeast, down the East Coast, and wrapped around into the Southeast where it changed into a stationary front. In the north, this front kicked up scattered showers with no significant rainfall amounts reported. However, some scattered thunderstorms over the region turned severe with nickel size hail reported in Steuben, Pennsylvania and trees and power lines were blown down in Kingston, New York. Meanwhile, behind this system, seasonably cool air has poured into the Northern Plains, Upper Midwest, and Ohio River Valley with highs in the 60s and 70s and mostly cloudy skies. In the Mid-Mississippi River Valley and Southern Plains, afternoon thunderstorms developed with some heavy downpours reported in areas of thunderstorms development. Hail was reported in multiple areas of Missouri and Arkansas, while strong winds blew dog kennels across a road in Tilly, Arkansas. Periods of heavy rain with 0.44 inches fell in one hour in Knott, Texas. Out West, high pressure allowed for pleasant weather to persist along the West Coast and Rocky Mountains regions. The Southwest saw scattered clouds with a few scattered thunderstorms but no significant rainfall or severe weather has been reported as flow from the north pushed most moisture south of the region.


Jim G. Munley, jr.

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