Isaac: Tornado captured on video; 23″ rainfall; MN mixed heat & storms

Tornadoes from hurricanes?

One surprising aspect of hurricanes and tropical storms to many is that they do produce tornadoes. As the system interacts with land, the spin or “shear” within individual cells in spiraling bands swirling around the hurricane can translate down to the ground as tornadoes.

Check out the impressive video of an apparently “weak” tornado captured in Gulfport, MS. You can see debris blowing in one direction, and then the other as the twister passes quickly by.

Source: WBIR-TV

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE NEW ORLEANS LA

723 AM CDT THU AUG 30 2012

0716 AM TORNADO PASCAGOULA 30.37N 88.55W

08/30/2012 JACKSON MS EMERGENCY MNGR

JACKSON COUNTY EMERGENCY MANAGEMENT REPORTED A TORNADO

SPOTTED ON MARKET STREET IN PASCAGOULA.

0716 AM TROPICAL STORM PICAYUNE 30.53N 89.68W

08/30/2012 PEARL RIVER MS BROADCAST MEDIA

*** 1 FATAL *** BROADCAST MEDIA REPORTED A FATALITY DUE

TO A TREE FALLING ON A CAR NEAR GOODYEAR BOULEVARD.

Tornado watches are out today for the eastern side of Isaac.

102 spc tor watch.gif

Source: NOAA/SPC

Rain keeps a comin’

Isaac’s main effect has been coastal storm surge and locally heavy rainfall.

Isaac has dumped anywhere from 7″ to 15″ of rain on Louisiana. Check out the incredible 23″+ total reported from the National Hurricane Center.

BASED ON OBSERVATIONS FROM NATIONAL OCEAN SERVICE TIDE GAUGES…AT NEW CANAL STATION LOUISIANA…A STORM SURGE OF NEAR 6 FEET IS STILL OCCURRING ON THE SOUTHERN SHORE OF LAKE PONTCHARTRAIN…AND A STORM SURGE VALUE OF NEAR 5 FEET IS OCCURRING AT WAVELAND MISSISSIPPI.

WIND…TROPICAL STORM CONDITIONS WILL CONTINUE ACROSS THE WARNING AREA THROUGH THIS MORNING.

RAINFALL…ISAAC IS EXPECTED TO PRODUCE TOTAL RAINFALL AMOUNTS OF 7 TO 14 INCHES…WITH POSSIBLE ISOLATED MAXIMUM AMOUNTS OF 25 INCHES…OVER MUCH OF LOUISIANA…MISSISSIPPI…SOUTHWEST ALABAMA AND ARKANSAS THROUGH FRIDAY. THESE RAINS COULD RESULT IN SIGNIFICANT LOWLAND FLOODING.

AN UNOFFICIAL REPORT OF A RAINFALL TOTAL OF 23.31 INCHES HAS BEEN RECEIVED FROM GRETNA LOUISIANA.

23″ is a year’s worth of rain for many states west of the Mississippi.

Isaac will continue to dump heavy, drought busting rains in the central states.

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Source: NOAA/HPC

Hot & steamy with a thunder chance:

We’re in for one last day of heat in southern Minnesota. A cool front is clearly visible on maps and satellite shots today cutting through central Minnesota.

To the south, temps should make the 90s again.

To the north, a much cooler and drier air mass is pushing in, and will spread south over Minnesota by tonight.

We’ll see a few scattered showers & T-Storms along the front today. SPC does not expect any severe weather.

The combination of wind, heat and low humidity make for high fire danger in southern Minnesota today. “Red Flag Warnings” are flying for all of southern Minnesota today.

102 rfw.png

Source: Twin Cities NWS

We’ll all enjoy a much cooler & drier air mass (40s & 50s dew points) ahead as we head into the weekend!

PH

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