Storms rumble again

A severe T-Storm watch is in effect until 2am. Storms near the metro have weakend in the past few hours. I expect the trend will be for storms to weaken as we go through tonight, but keep an eye out for possible warnings.

1 a a a roll cloud.jpg

Possible roll cloud or horizontal funnel captured by Scott Henry in Bloomington Sunday evening.

There have been a couple of funnel clouds sighted…so far no touchdowns. Here are the few severe weather reports via Twin Cities NWS.

MPX: River Falls [Pierce Co, WI] trained spotter reports HEAVY RAIN of M0.94 INCH at 08:19 PM CDT — pcpn fell in 37 minutes.

MPX: Bayport [Washington Co, MN] trained spotter reports TSTM WND DMG at 07:05 PM CDT — 8 inch diameter trees down.

MPX: Maple Grove [Hennepin Co, MN] nws employee reports TSTM WND DMG at 06:55 PM CDT — tree damage including 2 to 4 inch diameter branches down and a few 6 to 8 inch diameter trees down. damage reported near intersection of interstates 494 and 694.

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN

710 PM CDT SUN AUG 08 2010

..TIME… …EVENT… …CITY LOCATION… …LAT.LON…

..DATE… ….MAG…. ..COUNTY LOCATION..ST.. …SOURCE….

..REMARKS..

0700 PM HEAVY RAIN CHAMPLIN 45.17N 93.39W

08/08/2010 M0.95 INCH HENNEPIN MN TRAINED SPOTTER

RAIN ENDED/MEASURED 0.95 IN 40 MINS.

0706 PM HAIL OAKDALE 44.99N 92.97W

08/08/2010 M0.88 INCH WASHINGTON MN LAW ENFORCEMENT

MPX: 6 W River Falls [Pierce Co, WI] trained spotter reports FUNNEL CLOUD at 07:26 PM CDT — descended and rose again.

MPX: Afton [Washington Co, MN] trained spotter reports TSTM WND GST of M62 MPH at 07:08 PM CDT –

MPX: Montrose [Wright Co, MN] trained spotter reports FUNNEL CLOUD at 06:30 PM CDT — has gone up and down.

1 a a a watch.jpg

The main trigger for storms today is the heat creating unstable rising air that brewed into a few thunderstorms. In fact, our 96 today tied a record and is the hottest day so far this year!

RECORD EVENT REPORT

NATIONAL WEATHER SERVICE CHANHASSEN MN

750 PM CDT SUN AUG 08 2010

…THE TWIN CITIES HAS TIED THE RECORD HIGH TEMPERATURE FOR TODAY…

THE HIGH TEMPERATURE WAS 96 DEGREES IN THE TWIN CITIES THIS

AFTERNOON…AT 4:05 PM.

THIS TIES THE PREVIOUS RECORD HIGH TEMPERATURE SET IN 1914 AND 1894.

  • Skip

    What is that thin arc on radar pushing south from the Twin Cities?

  • Paul Huttner

    Great question Skip:

    That yellow arc is the advancing “outflow boundary” from the cool gush of air released by the storms. Think of dropping a rock into the pond…then the ripples go out.

    New storms can form along that boundary, but the amosphere generally becomes cooler and more stable behind it.

    PH