Tornado and Severe Thunderstorm Watch....Lincoln, NE
Posted: Sun Jul 20, 2003 8:09 pm
urgent - immediate broadcast requested Tornado Watch number 773 NWS Storm Prediction Center Norman OK 250 PM CDT sun Jul 20 2003
The NWS Storm Prediction Center has issued a Tornado Watch for portions of
Western Iowa eastern Nebraska extreme southeast South Dakota
Effective this Sunday afternoon and evening from 250 PM until 900 PM CDT.
Tornadoes... hail to 3 inches in diameter... thunderstorm wind gusts to 80 mph... and dangerous lightning are possible in these areas.
The Tornado Watch area is along and 80 statute miles east and west of a line from 35 miles east northeast of Yankton South Dakota to 60 miles west of Lamoni Iowa.
Remember... a Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings.
Other watch information... continue... ww 771... ww 772...
Discussion... extreme instability has developed near and W of the MO river where mlcape values now exceed 5000 j/kg. Satellite imagery shows a band of apparent accas over se SD which signifies at least weak ascent over this area. Thunderstorm development will be possible in the next 1-2 hours invof of NE neb/se SD along the instability gradient... with storms expected to move se/ssewd along the MO River Valley. Parameters appear favorable for supercells with very large hail and damaging winds. Additionally... boundary layer dew points in the mid to upper 70s and enhanced low-level shear along a remnant outflow boundary may be sufficient for a tornado threat.
Aviation... tornadoes and a few severe thunderstorms with hail surface and aloft to 3 inches. Extreme turbulence and surface wind gusts to 70 knots. A few cumulonimbi with maximum tops to 650. Mean storm motion vector 32025.
... Thompson
;430,0950 403,0933 403,0963 430,0981;
Severe Thunderstorm Watch
urgent - immediate broadcast requested Severe Thunderstorm Watch number 775 NWS Storm Prediction Center Norman OK 450 PM CDT sun Jul 20 2003
The NWS Storm Prediction Center has issued a Severe Thunderstorm Watch for portions of
Northwest and north central Kansas southwest and central Nebraska
Effective this Sunday afternoon and evening from 450 PM until 900 PM CDT.
Hail to 3 inches in diameter... thunderstorm wind gusts to 70 mph... and dangerous lightning are possible in these areas.
The Severe Thunderstorm Watch area is along and 65 statute miles either side of a line from 15 miles east of Columbus Nebraska to 45 miles south of Imperial Nebraska.
Remember... a Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes.
Other watch information... continue... ww 771... ww 772... ww 773... ww 774...
Discussion... scattered intense thunderstorms have developed across southwest neb and northwest KS. Other storms may initiate soon along weak surface boundary across central neb. Extremely unstable airmass and sufficient vertical shear suggests the potential for isolated severe storms capable of large hail and damaging winds.
Aviation... a few severe thunderstorms with hail surface and aloft to 3 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 34020.
... Hart
;403,0963 385,1011 404,1020 422,0972;
The NWS Storm Prediction Center has issued a Tornado Watch for portions of
Western Iowa eastern Nebraska extreme southeast South Dakota
Effective this Sunday afternoon and evening from 250 PM until 900 PM CDT.
Tornadoes... hail to 3 inches in diameter... thunderstorm wind gusts to 80 mph... and dangerous lightning are possible in these areas.
The Tornado Watch area is along and 80 statute miles east and west of a line from 35 miles east northeast of Yankton South Dakota to 60 miles west of Lamoni Iowa.
Remember... a Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings.
Other watch information... continue... ww 771... ww 772...
Discussion... extreme instability has developed near and W of the MO river where mlcape values now exceed 5000 j/kg. Satellite imagery shows a band of apparent accas over se SD which signifies at least weak ascent over this area. Thunderstorm development will be possible in the next 1-2 hours invof of NE neb/se SD along the instability gradient... with storms expected to move se/ssewd along the MO River Valley. Parameters appear favorable for supercells with very large hail and damaging winds. Additionally... boundary layer dew points in the mid to upper 70s and enhanced low-level shear along a remnant outflow boundary may be sufficient for a tornado threat.
Aviation... tornadoes and a few severe thunderstorms with hail surface and aloft to 3 inches. Extreme turbulence and surface wind gusts to 70 knots. A few cumulonimbi with maximum tops to 650. Mean storm motion vector 32025.
... Thompson
;430,0950 403,0933 403,0963 430,0981;
Severe Thunderstorm Watch
urgent - immediate broadcast requested Severe Thunderstorm Watch number 775 NWS Storm Prediction Center Norman OK 450 PM CDT sun Jul 20 2003
The NWS Storm Prediction Center has issued a Severe Thunderstorm Watch for portions of
Northwest and north central Kansas southwest and central Nebraska
Effective this Sunday afternoon and evening from 450 PM until 900 PM CDT.
Hail to 3 inches in diameter... thunderstorm wind gusts to 70 mph... and dangerous lightning are possible in these areas.
The Severe Thunderstorm Watch area is along and 65 statute miles either side of a line from 15 miles east of Columbus Nebraska to 45 miles south of Imperial Nebraska.
Remember... a Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes.
Other watch information... continue... ww 771... ww 772... ww 773... ww 774...
Discussion... scattered intense thunderstorms have developed across southwest neb and northwest KS. Other storms may initiate soon along weak surface boundary across central neb. Extremely unstable airmass and sufficient vertical shear suggests the potential for isolated severe storms capable of large hail and damaging winds.
Aviation... a few severe thunderstorms with hail surface and aloft to 3 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 34020.
... Hart
;403,0963 385,1011 404,1020 422,0972;
