Mind-Boggling Rainfall Amounts. This map shows estimated rainfall based on Doppler radar returns from the Twin Cities NWS radar in Chanhassen - over 6" from near New Prague to Northfield, Nerstrand and Cannon Falls. I'm worried about serious flooding in this area, flooding of streets, streams and basements - roads may be washed out in some areas. Keep in mind 6" is what you would expect to see in about 6 weeks. What caused this? A "Train Echo Effect". Much like the cars of a train pass over the same section of track, thunderstorms kept redeveloping and passing over the same counties, each one dumping out 1-2" of additional rain (on saturated soil). I have a hunch we'll be seeing significant damage reports from the far south metro.
Stubborn Storms. NWS Doppler at 7:07 pm shows a "wall of water" just south of MSP - thunderstorms redeveloping near Faribault (where Doppler is estimating 2.6" diameter hail) and Red Wing. Strong to severe storms may rake Owatonna, Rochester and Wabasha in the coming hours, the far south metro still in a Severe Storm Watch until 10 pm. Here is the latest on the Flash Flood Warning for the far south metro:
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
557 PM CDT THU JUN 14 2012
THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A
* FLASH FLOOD WARNING FOR...
GOODHUE COUNTY IN SOUTHEAST MINNESOTA...
NORTHERN RICE COUNTY IN SOUTH CENTRAL MINNESOTA...
SOUTHERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
* UNTIL 1000 PM CDT
* AT 555 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED SLOW
MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED
AREA. 3 TO 4 INCHES OF RAIN HAVE FALLEN SINCE THIS MORNING...AND
ADDITIONAL 1 TO 2 INCHES ARE POSSIBLE.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...RED
LAW ENFORCEMENT HAS REPORTED THAT SOME ROADS ARE IMPASSIBLE BETWEEN
NORTHFIELD AND NERSTRAND.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN THE