Summer weather alerts for 2010 (Sheridan, Wheatland: tornado, living in, dangerous)
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HEAVY RAINFALL LIKELY LATE THIS AFTERNOON INTO TONIGHT..
UNTIL 10:45AM MDT
Urgent - Immediate Broadcast Requested
National Weather Service Billings MT
1045 AM MDT Mon May 24 2010
, Heavy Rainfall Likely Late This Afternoon Into Tonight,
.A Strong Storm System Will Move North Out Of Colorado Today Into
Tonight Resulting In Periods Of Heavy Rain And Isolated
Thunderstorms. Little And Big Goose Creeks Are Near Bankfull This
Morning. Additional Heavy Rain May Cause These Creeks To Overflow
Their Banks. A Break In The Weather Is Expected Tuesday Afternoon
Through Wednesday. However, Above Normal Temperatures Will Be
Likely By Thursday And Friday Resulting In Melting Snow In The Big
Horn Mountains. This May Further Aggravate Streams And Creek
Levels Across The Plains Of Sheridan County.
Including The City Of, Sheridan
1045 AM MDT Mon May 24 2010
, Flood Watch In Effect Through Friday Morning,
The National Weather Service In Billings Has Issued A
* Flood Watch For A Portion Of North Central Wyoming, Including
The Following County, Sheridan.
* Through Friday Morning
* Periods Of Heavy Rain Today And Tonight Along With Snow Melt
From The Big Horn Mountains Later This Week Will Result In
Rising Stream And Creek Levels Through The Week.
* Persons Living Near Any Stream Or Creek, Especially The Little
And Big Goose Creeks, Should Pay Attention To The Possibility
Of Rising Water Levels.
A Flood Watch Means There Is A Potential For Flooding Based On
You Should Monitor Later Forecasts And Be Alert For Possible
Flood Warnings. Those Living In Areas Prone To Flooding Should Be
Prepared To Take Action Should Flooding Develop.
Issue Time:5/24/2010 10:45:00 AM
Valid Until:5/25/2010 10:45:00 AM
Hazardous weather outlook
national weather service rapid city sd
635 am mdt wed may 26 2010
bennett-butte-central black hills-custer co plains-fall river-haakon-
harding-hermosa foot hills-jackson-mellette-northeastern crook-
northern black hills-northern campbell-northern foot hills-
northern meade co plains-pennington co plains-perkins-rapid city-
shannon-southern black hills-southern campbell-southern foot hills-
southern meade co plains-sturgis/piedmont foot hills-todd-tripp-
western crook-weston-wyoming black hills-ziebach-
635 am mdt (735 am cdt) wed may 26 2010
this hazardous weather outlook is for western south dakota and
.day one...today and tonight
instability will increase today as southeast winds transport
moisture into the area. A few thunderstorms will develop over
northeastern wyoming and western south dakota this afternoon and
evening. There is a slight risk of severe thunderstorms over
northeastern wyoming and far western south dakota. Large hail will
be the main threat.
.days two through seven...thursday through tuesday
thunderstorm chances will continue thursday through sunday.
Isolated severe thunderstorms are possible over northeastern wyoming
and the black hills thursday afternoon and evening. Large hail will
be the main threat.
There is a slight risk of severe thunderstorms over northeastern
wyoming and western south dakota friday afternoon and evening.
Large hail will be the main threat...but an isolated tornado cannot
be ruled out.
The most significant chance for severe thunderstorms will be
saturday over northeastern wyoming and western south dakota. All
forms of severe weather will be possible...including large hail...
Damaging winds...and isolated tornadoes. Locally heavy rain will also
A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location, and/or timing is still uncertain. It is intended to provide enough lead time so that those who need to set their plans in motion can do so.
A warning is issued when a hazardous weather or hydrologic event is occurring, is imminent, or has a very high probability of occurring. A warning is used for conditions posing a threat to life or property.
Severe Local Storm
A convective storm that usually covers a relatively small geographic area, or moves in a narrow path, and is sufficiently intense to threaten life and/or property. Examples include severe thunderstorms with large hail, damaging wind, or tornadoes. Although cloud-to-ground lightning is not a criteria for severe local storms, it is acknowledged to be highly dangerous and a leading cause of deaths, injuries, and damage from thunderstorms. A thunderstorm need not be severe to generate frequent cloud-to-ground lightning. Additionally, excessive localized convective rains are not classified as severe storms but often are the product of severe local storms. Such rainfall may result in related phenomena (flash floods) that threaten life and property.
Severe Thunderstorm Watch
This is issued by the National Weather Service when conditions are favorable for the development of severe thunderstorms in and close to the watch area. A severe thunderstorm by definition is a thunderstorm that produces 3/4 inch hail or larger in diameter and/or winds equal or exceed 58 miles an hour. The size of the watch can vary depending on the weather situation. They are usually issued for a duration of 4 to 8 hours. They are normally issued well in advance of the actual occurrence of severe weather. During the watch, people should review severe thunderstorm safety rules and be prepared to move a place of safety if threatening weather approaches.
A Severe Thunderstorm Watch is issued by the Storm Prediction Center in Norman, Oklahoma. Prior to the issuance of a Severe Thunderstorm Watch, SPC will usually contact the affected local National Weather Service Forecast Office (NWFO) and they will discuss what their current thinking is on the weather situation. Afterwards, SPC will issue a preliminary Severe Thunderstorm Watch and then the affected NWFO will then adjust the watch (adding or eliminating counties/parishes) and then issue it to the public by way of a Watch Redefining Statement. During the watch, the NWFO will keep the public informed on what is happening in the watch area and also let the public know when the watch has expired or been cancelled.
Severe Thunderstorm Warning
This is issued when either a severe thunderstorm is indicated by the WSR-88D radar or a spotter reports a thunderstorm producing hail 3/4 inch or larger in diameter and/or winds equal or exceed 58 miles an hour; therefore, people in the affected area should seek safe shelter immediately. Severe thunderstorms can produce tornadoes with little or no advance warning. Lightning frequency is not a criteria for issuing a severe thunderstorm warning. They are usually issued for a duration of one hour. They can be issued without a Severe Thunderstorm Watch being already in effect.
Like a Tornado Warning, the Severe Thunderstorm Warning is issued by your National Weather Service Forecast Office (NWFO). Severe Thunderstorm Warnings will include where the storm was located, what towns will be affected by the severe thunderstorm, and the primary threat associated with the severe thunderstorm warning. If the severe thunderstorm will affect the nearshore or coastal waters, it will be issued as the combined product--Severe Thunderstorm Warning and Special Marine Warning. If the severe thunderstorm is also causing torrential rains, this warning may also be combined with a Flash Flood Warning. If there is an ampersand (&) symbol at the bottom of the warning, it indicates that the warning was issued as a result of a severe weather report.
After it has been issued, the affected NWFO will follow it up periodically with Severe Weather Statements. These statements will contain updated information on the severe thunderstorm and they will also let the public know when the warning is no longer in effect.
Hazardous Weather Outlook
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
506 AM MDT THU MAY 27 2010
SOUTHERN WHEATLAND-MUSSELSHELL-TREASURE-NORTHERN ROSEBUD-CUSTER-
FALLON-NORTHERN STILLWATER-YELLOWSTONE-POWDER RIVER-CARTER-
SOUTHERN BIG HORN-EASTERN CARBON-NORTHERN PARK-
NORTHERN SWEET GRASS-GOLDEN VALLEY-RED LODGE FOOTHILLS-
NORTHERN BIG HORN-SOUTHERN ROSEBUD-JUDITH GAP-PARADISE VALLEY-
LIVINGSTON AREA-BEARTOOTH FOOTHILLS-ABSAROKA/BEARTOOTH MOUNTAINS-
CRAZY MOUNTAINS-NORTHEAST BIG HORN MOUNTAINS-SHERIDAN FOOTHILLS-
506 AM MDT THU MAY 27 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...SOUTH CENTRAL MONTANA...SOUTHEAST MONTANA AND NORTH
.DAY ONE...TODAY AND TONIGHT
SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER EASTERN
MONTANA THIS AFTERNOON AND EVENING. SOME OF THE STORMS COULD
BECOME SEVERE PRODUCING LARGE HAIL...STRONG WIND GUSTS AND HEAVY
RAIN. SOME STORMS MAY ALSO PRODUCE CONSIDERABLE LIGHTNING.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
THE THREAT OF SEVERE THUNDERSTORMS WILL CONTINUE FRIDAY OVER THE
EASTERN COUNTIES OF CUSTER...FALLON...POWDER RIVER AND CARTER.
COOLER AND WETTER WEATHER WILL MOVE IN FRIDAY NIGHT THROUGH
SATURDAY NIGHT. WIDESPREAD SHOWERS WILL DEVELOP OVER WESTERN
ZONES FRIDAY AFTERNOON AND SLOWLY SPREAD EAST INTO CENTRAL ZONES
FRIDAY NIGHT AND SATURDAY. THE SHOWERS WILL BE SLOW MOVING AND
COULD PRODUCE AN INCH AND A HALF OF RAIN BY THE TIME THEY END
SATURDAY NIGHT. THIS RAINFALL WILL CAUSE STREAMS AND RIVERS TO
RISE. ALTHOUGH FLOODING IS NOT EXPECTED AT THIS TIME OVER SOUTH
CENTRAL MONTANA...PEOPLE LIVING ALONG STREAMS AND CREEKS SHOULD
BE AWARE OF RISING WATER LEVELS THIS WEEKEND.
SEASONAL TEMPERATURES WILL RESULT IN AN INCREASE OF SNOW MELT IN
THE BIG HORN MOUNTAINS. SNOW MELT RUN OFF MAY COINCIDE WITH HEAVY
RAIN EXPECTED OVER THE WEEKEND. THIS MAY CAUSE RIVER AND STREAM
LEVELS ACROSS SHERIDAN COUNTY TO RISE...IN PARTICULAR THE BIG
GOOSE AND LITTLE GOOSE CREEKS NEAR SHERIDAN.
.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
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