Special Weather Statement, NWS Twin Cities, MN

Area Forecast Discussion...UPDATED
National Weather Service Twin Cities/Chanhassen MN
1207 AM CDT WED OCT 26 2016

.SHORT TERM...(This evening through Wednesday)
Issued at 315 PM CDT Tue Oct 25 2016

Early afternoon water vapor imagery together with GFS 500mb heights
and winds showed a longwave trough over New England, with a subtle
low-amplitude shortwave over the western Dakotas. Over the next 24
hours this subtle shortwave will strengthen as the aforementioned
longwave trough retards its progression eastward. Ageostrohpic
divergence in response to the upper level curvature will lead to
rising air which will cause a surface low to track across Iowa. A
broad area of H850 Fgen will develop north of the surface low, and
this focused area of ascent will lead to 1 to 2 inches of rain across
southeast MN and west central WI overnight. At this point is
appears the that the heaviest rain will fall east of Redwood
Falls, south of Lakeville MN, and north of I-90. HiRes models show
convection developing after 00Z, so lifted the chances for thunder
a bit north up to the southern Metro.

Looking ahead, forecast soundings maintain the boundary layer
moisture along with weak omega, so continued with pops Wednesday
morning as there will likely be some lingering light rain and
drizzle. No sunshine is expected for Wednesday, and high temps will
only warm a couple of degrees into the mid 40s.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 325 PM CDT Tue Oct 25 2016

The longer term concerns remain the development of the western
coast trough and ridging ahead of the western CONUS energy with
warming over the area early in period...followed by overall timing
issues of fronts into the weekend.

Models continue to show strong trough over the west coast this
week...with embedded short wave energy ejected eastward affecting
our region. The next wave moves in on Friday...with decent WAA
pattern ahead of the associated surface front. This should provide
some lower 70s to the southwest with fropa...and dependent on
overall opaqueness of cloud cover. Clouds should be increase as
the front arrives...but moisture remains limited with this
system...and better forcing north and rather post frontal. We
warmed SUPERBLEND guidance a few degrees...closer to MOSGUIDE...
with 850mb temps progged in the upper teens.

The models diverge into the remainder of the period with the 12z
ECMWF a bit more amplified with the next short wave for Saturday.
The GFS is currently more progressive with the wave...but both a
pointing to a more post frontal rain shower risk with the system.
We expanded the coverage area of small pops for about the northern
two thirds of the CWA. Another wave approaches the area around
Halloween...but this will be dependent on timing of the west
coast energy. We will retain the small chance pops for this
period for now.

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1207 AM CDT WED OCT 26 2016

Conditions will continue deteriorating overnight. IFR conditions
are now in place across western MN. Slow improvement expected Wed
afternoon.

KMSP...MVFR conditions will deteriorate to IFR around 10Z. The
heaviest rain and storm potential will likely remain across
southern MN.

/OUTLOOK FOR KMSP/
Thu...VFR with MVFR Cig possible. Wind VRB 5 kt.
Fri...VFR. Wind S 5-15 kt.
Sat...VFR with MVFR/-Shra possible. Wind N at 10g25 kt.

&&

.MPX Watches/Warnings/Advisories...
WI...None.
MN...None.
&&

SHORT TERM...JRB
LONG TERM...DWE
AVIATION...BORGHOFF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
309 AM CDT WED OCT 26 2016

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
270900-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-
YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA-
REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH-
WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE-
309 AM CDT WED OCT 26 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MINNESOTA...EAST CENTRAL MINNESOTA...SOUTH CENTRAL MINNESOTA...
SOUTHEAST MINNESOTA...SOUTHWEST MINNESOTA...WEST CENTRAL
MINNESOTA...NORTHWEST WISCONSIN AND WEST CENTRAL WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1227 AM CDT WED OCT 26 2016

MNZ082-083-091>093-260830-
MARTIN-WATONWAN-FREEBORN-FARIBAULT-BLUE EARTH-
1227 AM CDT WED OCT 26 2016

...VERY HEAVY RAIN AND LOCALIZED MINOR FLOODING EXPECTED...

VERY HEAVY RAIN WITH THE POTENTIAL FOR LOCALIZED FLOODING WILL AFFECT
THE FOLLOWING COUNTIES...

MARTIN...WATONWAN...FREEBORN...FARIBAULT...BLUE EARTH...

AT 1223 AM CDT...SEVERAL HOURS OF MODERATE TO HEAVY RAINFALL HAS
OCCURRED ACROSS PARTS OF SOUTH CENTRAL MINNESOTA. LOCAL RADAR
INDICATED UP TO THREE INCHES OF HAS FALLEN NEAR TRUMAN...AMBOY AND
WELLS SINCE EARLIER TONIGHT.  ANOTHER HALF INCH TO INCH OF RAIN
WILL BE POSSIBLE ACROSS THE AREA LEADING TO LOCALIZED FLOODING.

LOCATIONS IMPACTED INCLUDE...
ALBERT LEA...FAIRMONT...BLUE EARTH...WELLS...WINNEBAGO...SHERBURN...
TRUMAN...TRIMONT...CLARKS GROVE...MINNESOTA LAKE...
WELCOME AND ELMORE.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 35 BETWEEN MILE MARKERS 1 AND 21.
 INTERSTATE 90 BETWEEN MILE MARKERS 82 AND 173.
 U.S. HIGHWAY 169 BETWEEN MILE MARKERS 1 AND 28.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...AS WELL AS FARM AND COUNTRY ROADS. DO NOT
ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

LAT...LON 4351 9485 4384 9484 4384 9485 4385 9483
      4395 9483 4378 9305 4350 9306
TIME...MOT...LOC 0523Z 180DEG 0KT 4374 9404

JLT

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
345 AM CDT WED OCT 26 2016

MNZ082-083-091>093-261145-
MARTIN-WATONWAN-FREEBORN-FARIBAULT-BLUE EARTH-
345 AM CDT WED OCT 26 2016

...RUNOFF FROM OVERNIGHT HEAVY RAIN WILL CAUSE LOCALIZED MINOR
FLOODING...

THE POTENTIAL FOR LOCALIZED FLOODING WILL AFFECT THE FOLLOWING
COUNTIES...

MARTIN...WATONWAN...FREEBORN...FARIBAULT...BLUE EARTH...

AT 345 AM CDT...THE HEAVY RAINFALL HAS ENDED...BUT STORM TOTAL
PRECIPITATION OF 3 TO 4 INCHES OVERNIGHT WILL CAUSE LOCALIZED
FLOODING IN LOW LYING AREAS...STREAMS AND CREEKS THROUGH 7 AM.

LOCATIONS IMPACTED INCLUDE...
ALBERT LEA...FAIRMONT...BLUE EARTH...WELLS...WINNEBAGO...TRUMAN...
TRIMONT...CLARKS GROVE...MINNESOTA LAKE...ALDEN...
GLENVILLE AND EMMONS.

DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES.

LAT...LON 4375 9486 4377 9486 4392 9454 4376 9305
      4351 9305 4350 9397
TIME...MOT...LOC 0840Z 180DEG 0KT 4369 9388

JLT