Special Weather Statement, NWS Twin Cities, MN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1142 AM CDT THU JUL 25 2013

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 329 AM CDT THU JUL 25 2013

AT 6Z...WPC HAD A COLD FRONT ANALYZED FROM A SFC LOW OVER THE
ARROWHEAD BACK SW TO THE AXN AREA AND BACK ACROSS NRN SODAK. THE
FRONT SITS WITHIN A RATHER BAGGY PRESSURE PATTERN...WITH MULTIPLE
BOUNDARIES HANGING AROUND BETWEEN MN AND THE DAKOTAS. BASED ON THE
WIND FIELD...THE WPC ANALYZED FRONT LOOKS TO HAVE THE MAIN WARM
SECTOR WITH SRLY WINDS TO THE SOUTH/EAST OF IT...WITH VERY LITTLE
WINDS BEHIND IT. THE MAIN WIND SHIFT TO THE NW HANGS BACK ACROSS
NW NODAK AND LOOKS TO EVENTUALLY HOOK UP WITH THE MAIN
BOUNDARY...BUT THAT DOES NOT LOOK TO HAPPEN UNTIL TONIGHT.

OUT AHEAD OF THIS FRONT...PRESENCE OF 20KT WRLY LLJ AND ASSOCIATED
WEAK WAA AND MOISTURE TRANSPORT HAS ALLOWED A FEW SHOWERS/STORMS
TO PERSIST THROUGH THE NIGHT. ENVIRONMENT OUT HEAD OF THESE
SHOWERS IS PRETTY HOSTILE IN TERMS OF DRYNESS AND LACK OF
INSTABILITY AND EXPECT THESE SHOWERS TO FADE AWAY TO NOT MUCH MORE
THAN CLOUDS AND SPRINKLES THIS MORNING.

FOR THIS AFTERNOON...HI-RES CAMS FROM THE HOPWRF TO THE HRRR AND
NMMS/ARWS ARE ALL IN FAIRLY GOOD AGREEMENT ON HANDLING OF
CONVECTION...SO FOLLOWED THEM CLOSELY IN DRAWING POPS FOR THIS
AFTERNOON/EVENING. BASED ON THAT...CURRENT THINKING IS THAT BY
18Z...COLD FRONT JUST NOW ENTERING THE NW MPX CWA WILL BE NEAR A
RWF/MSP/RCX LINE. DEWPS IN THE LOW TO MID 60S ARE EXPECTED TO BE
COMMON OUT AHEAD OF THE FRONT AND WITH DAYTIME HEATING...MODELS IN
GOOD AGREEMENT WITH GENERATING AROUND 1500 J/KG OF MLCAPE IN THE
WARM SECTOR. WITHIN THIS PRE-FRONTAL ENVIRONMENT...CAMS GENERATE
CONVECTION ALONG SOUTH OF THE RWF/MSP/RCX LINE PRETTY QUICKLY IN
THE 18Z TO 20Z TIME-FRAME...AND SLOWLY SAG ACTIVITY SOUTH THROUGH
THE EVENING...WITH MOST ACTIVITY OUT OF THE MPX AREA BY 6Z.
CONVECTION IS FORECAST TO BE MOST WIDESPREAD ACROSS SRN MN...WHICH
MAKES SENSE WHEN LOOKING AT H85 MOISTURE TRANSPORT FROM THE
DETERMINISTIC MODELS WHICH SHOW SRN MN GETTING UNDER THE MOST
INFLUENCE FROM A SWRLY ORIENTED LLJ THAT WILL BE COMING UP OUT OF
NEB AND INTO IA.

FROM THE SEVERE PERSPECTIVE...VERY WEAK SFC WINDS AND TOUGH TO PIN
DOWN BOUNDARY SHOULD RESULT IN A NEARLY ZERO TORNADO THREAT.
HOWEVER...WITH A BETTER THAN 50KT MID LEVEL DROPPING SOUTH INTO NRN
MN THIS AFTERNOON...THIS WILL RESULT IN AMPLE DEEP LAYER SHEAR FOR
THUNDERSTORM ORGANIZATION...ALONG WITH SUPERCELLS...HENCE THE
NEARLY ZERO AND NOT COMPLETELY ZERO CHANCE FOR A TORNADO.
INSTEAD... FREEZING LEVELS DOWN AT A FALL LIKE 10K FT OR LESS
ALONG WITH STEEP LOW LEVEL LAPSE RATES WILL KEEP THE MAIN RISKS AS
A FEW STORMS CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS.

NW OF THE RWF/MSP/RCX LINE...PRECIP IS LOOKING LIKE IT MAY BE HARD
TO COME BY...WITH THE ONLY HOPE FOR PRECIP THIS AFTERNOON IN THESE
LOCATIONS BEING THAT SOMETHING CAN GET GOING ALONG WITH WIND SHIFT
BOUNDARY TO NW WINDS THAT WILL BE TRAILING THE MAIN FRONT.

FOR TONIGHT...LIKELY TOO SLOW IN CLEARING OUT PRECIP BASED ON THE
CAMS...BUT OTHER THAN THAT...GOOD AGREEMENT ON A SIGNIFICANT SURGE
OF COLD AIR /FOR JULY STANDARDS/ INFILTRATING THE AREA IN THE WAKE
OF THE FRONT...SETTING THE STAGE FOR THE TASTE OF SEPTEMBER OVER
THE WEEKEND.

.LONG TERM...(FRIDAY THROUGH WEDNESDAY)
ISSUED AT 329 AM CDT THU JUL 25 2013

MUCH MORE TRANQUIL CONDS ARE ON TAP FOR THE END OF THIS WEEK INTO
THE FIRST PORTION OF NEXT WEEK...ALBEIT NOTICEABLY COOLER AND
DRIER.

SFC CDFNT WILL HAVE JUST ABOUT EXITED THE WFO MPX CWFA BY DAYBREAK
FRI MRNG WHILE ITS PARENT LOW PRES CENTER ROTATES THRU NRN WI.
ALOFT...A CUTOFF H5 LOW WILL TRAIL THE SFC LOW THRU NRN MN THEN
BECOME STALLED OUT OVER THE NRN GREAT LAKES FRI NIGHT THRU SUN
NIGHT. THERE WILL BE SOME WEAK SHWRS SPARKED BY SHORTWAVE
DISTURBANCES ROTATING ARND THE UPR LVL LOW FRI. HOWEVER...MUCH
DRIER CONTINENTAL AIR WILL BE PULLED INTO THE REGION WITHIN THE
PROLONGED NWLY FLOW THRU THE WEEKEND. IN ADDITION...TEMPS WILL
BECOME MUCH COOLER DURING THE WEEKEND. H85 TEMPS WILL DROP TO THE
5-7 DEG C RANGE...WHICH TRANSLATING TO THE SFC DESPITE FULL SUN
WILL ONLY PRODUCE HIGH TEMPS IN THE 60S TO ARND 70. AS FOR
OVERNIGHT LOWS...WITH SFC HIGH PRES SHIFTING ACRS TO ALLOW WINDS
TO SETTLE DOWN AT NIGHT...LOWS WILL DROP INTO THE 40S AWAY FROM
THE TWIN CITIES METRO.

TEMPERATURES SLOWLY RECOVER DURING THE FIRST PORTION OF NEXT WEEK
AS THE SFC HIGH SHIFTS E OF THE REGION...ALLOWING A SLY RETURN
FLOW TO DEVELOP ON THE BACKSIDE OF THE HIGH. AS TEMPERATURES
RISE...SO WILL DEW-POINTS AND HENCE HUMIDITY LEVELS. IN ADDITION...
ANOTHER FRONTAL SYSTEM IS EXPECTED BETWEEN MON-TUE WHICH WILL
FORCE THE RE-INTRODUCTION OF SMALL CHCS FOR PRECIP IN THE FIRST
PORTION OF NEXT WEEK.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z FRIDAY AFTERNOON)
ISSUED AT 1127 AM CDT THU JUL 25 2013

MAIN AVIATION CONCERN IS COVERAGE OF THE SHRA/TSRA THIS AFTN ONCE
THE CAP BREAKS AND AN AREA OF SHRA/TSRA BETWEEN TWO SYSTEMS ACROSS
SD/WC MN BEGIN TO MERGE. INITIALLY...IT SEEMS THAT THE BEST
MOISTURE CONVERGENCE WILL BE SOUTH OF THE MAIN MPX TAF
TERMINALS...WITH THE EXCEPTION OF RWF/EAU WHERE DAYTIME HEATING
AND A MORE SW FLOW WILL AID IS BETTER TSRA ACTIVITY AND COVERAGE.
ELSEWHERE...ESPECIALLY NORTH OF MSP TO RNH...ACTIVITY WILL LIKELY
BE ISOLATED IN TERMS OF TSRA WITH MORE SHRA DURING THE FIRST 3-6
HRS. ONCE THE MAIN CAA BEGINS THIS AFTN ACROSS WC MN...THE
SHRA/TSRA ACTIVITY SHOULD MOVE SOUTH ACROSS MOST OF MPX AIRPORT
TERMINALS. WILL CONTINUE WITH A TEMPORARY PERIOD OF 4-6SM SHRA
WITH VCTS AT RWF BETWEEN 18-20Z. THIS IS SIMILAR TO EAU BUT A BIT
LATER. AFT 06Z...MOST OF THE SHRA SHOULD BE SOUTH OF MN...BUT DO
HAVE SOME CONCERNS WITH REDEVELOPMENT OF -SHRA ALONG THE LEADING
EDGE OF THE STRONGEST CAA THIS EVENING. LATER SHIFTS WILL NEED TO
MONITOR ACTIVITY ACROSS NW MN AND WHETHER THIS WILL HOLD ON DURING
THE AFTN/EVENING. WINDS WILL INCREASE BY FRIDAY MORNING FROM THE
NW/NNW AND BECOME GUSTY BY 15-18Z. MVFR CIGS ARE ALSO LIKELY BY
9-15Z ACROSS AXN/STC/RNH.

KMSP...

THE NEXT 6 HRS FORECAST IS BASED ON ACTIVITY ACROSS WC MN AND
WHETHER THIS ACTIVITY WILL INTENSIFY...OR REDEVELOP FURTHER TO
THE SOUTH AND KEEP THE BULK OF THE HEAVIER TSRA SOUTH OF MSP
TERMINAL. THERE IS ENOUGH CERTAINTY THAT VCTS WILL OCCUR AT MSP.
TIMING AND HOW STRONG REMAINS THE PROBLEM. WILL CONTINUE WITH VCTS
BUT TEMPORARY OF 5-6SM SHRA AND CIGS DROPPING TO LOW END VFR. SOME
CONCERNS OF REDEVELOPMENT OF VCSH AFT 00Z WITH THE MAIN CAA
STARTS. BUT WILL LEAVE THIS ALONE FOR THE SHORT TERM. GUSTY WINDS
WILL LIKELY DEVELOP BY MID/LATE FRIDAY MORNING AS MUCH COOLER AIR
USHERS IN FOR LATE JULY. SOME MVFR CIGS ARE POSSIBLE DURING THE
MORNING...BUT NOT ENOUGH CONFIDENCE TO BEGIN WITH MVFR CIGS...BUT
KEEP SCT020 CIGS OF 3.5K REMAINING IN THE TAF.

/OUTLOOK FOR KMSP/

FRI EVENING...VFR. WINDS NW 15G25 KTS.
SAT...VFR. WINDS NW 10G20 KTS.
SUN...VFR. WINDS LGT AND VRB.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
&&

SHORT TERM...MPG
LONG TERM...JPC
AVIATION...JLT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1039 AM CDT THU JUL 25 2013

MNZ060-062-063-065>070-073>078-082>085-091>093-WIZ015-016-023>028-
261545-
HENNEPIN-RAMSEY-WASHINGTON-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-
DAKOTA-REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-
BLUE EARTH-WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-CHIPPEWA-EAU CLAIRE-
1039 AM CDT THU JUL 25 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE WEATHER THIS AFTERNOON INTO THE
EVENING. THUNDERSTORMS ARE EXPECTED TO DEVELOP BETWEEN 1 PM AND 3
PM NEAR OR SOUTH OF A REDWOOD FALLS...TO THE TWIN CITIES...TO
LADYSMITH LINE AND SLOWLY MOVE SOUTHEAST ACROSS SOUTHERN
MINNESOTA AND WESTERN WISCONSIN THROUGH THE EVENING. THE MAIN
SEVERE WEATHER THREATS WILL BE HAIL IN EXCESS OF ONE INCH IN
DIAMETER AND WIND GUSTS TO 60 MPH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

CHANCES FOR THUNDERSTORMS RETURN FOR MONDAY THROUGH TUESDAY
NIGHT. AT THIS TIME...THE CHANCES FOR SEVERE WEATHER WITH THIS
ACTIVITY IS LOW.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED.

MNZ041>045-047>059-061-064-WIZ014-261545-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-ANOKA-YELLOW MEDICINE-POLK-
1039 AM CDT THU JUL 25 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS
AFTERNOON...BUT THE THREAT FOR SEVERE WEATHER WILL BE LOW.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

CHANCES FOR THUNDERSTORMS RETURN FOR MONDAY THROUGH TUESDAY
NIGHT. AT THIS TIME...THE CHANCES FOR SEVERE WEATHER WITH THIS
ACTIVITY IS LOW.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

JLT

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
129 PM CDT THU JUL 25 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0124 PM     HAIL             LE CENTER               44.39N 93.73W
07/25/2013  M0.75 INCH       LE SUEUR           MN   TRAINED SPOTTER

            ACTUAL REPORT WAS DIME SIZE.

&&

DFC

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
135 PM CDT THU JUL 25 2013

MNZ076-077-084-251900-
LE SUEUR-RICE-WASECA-
135 PM CDT THU JUL 25 2013

AT 129 PM CDT...WEATHER SERVICE RADAR WAS TRACKING A STRONG
THUNDERSTORM 9 MILES SOUTHEAST OF LE CENTER. THIS STORM WAS MOVING
EAST AT 25 MPH.

HAIL UP TO NICKEL SIZE AND WINDS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM.

* LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  KILKENNY.
  MORRISTOWN.
  WARSAW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4420 9372 4438 9368 4437 9332 4420 9337
      4419 9341 4417 9341
TIME...MOT...LOC 1836Z 286DEG 22KT 4428 9356

JLT

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
220 PM CDT THU JUL 25 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0216 PM     HEAVY RAIN       FARIBAULT               44.30N 93.27W
07/25/2013  E0.00 INCH       RICE               MN   LAW ENFORCEMENT

            URBAN STREET FLOODING REPORTED.

&&

CARLYON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
254 PM CDT THU JUL 25 2013

MNZ083>085-092-093-252045-
BLUE EARTH-FARIBAULT-FREEBORN-STEELE-WASECA-
254 PM CDT THU JUL 25 2013

AT 250 PM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 13 MILES SOUTHWEST OF
CLAREMONT TO 14 MILES SOUTH OF WASECA TO 21 MILES SOUTH OF MANKATO.
THESE STORMS WERE MOVING SOUTHEAST AT 25 MPH.

RECENTLY...WIND GUSTS OF 40 TO 50 MPH HAVE BEEN REPORTED ACROSS THE
AREA. THESE WINDS ALONG WITH VERY HEAVY RAINFALL...CAN CAUSE SMALL
TREES AND LARGE TREE LIMBS TO BLOW DOWN.

PEA SIZE HAIL AND WINDS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  NEW RICHLAND.
  MINNESOTA LAKE.
  BLOOMING PRAIRIE.
  GENEVA.
  HARTLAND.
  WELLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE GUSTY WINDS WILL BE CAPABLE OF KNOCKING DOWN SMALL TREES...TREE
LIMBS...AND POWERLINES. SEEK SAFE SHELTER UNTIL THE STORM HAS PASSED.

&&

LAT...LON 4397 9395 4389 9347 4399 9304 4362 9304
      4360 9307 4359 9364
TIME...MOT...LOC 1952Z 312DEG 20KT 4388 9312 4388 9352
          4388 9382

JLT

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
306 PM CDT THU JUL 25 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0250 PM     TSTM WND GST     5 WNW STEELE CENTER     43.96N 93.28W
07/25/2013  M51 MPH          STEELE             MN   MESONET

            MNDOT SENSOR I-35 MILE POST 30 NEAR REST STOP.

&&

CARLYON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
313 PM CDT THU JUL 25 2013

MNZ092-093-252100-
FARIBAULT-FREEBORN-
313 PM CDT THU JUL 25 2013

AT 309 PM CDT...WEATHER SERVICE RADAR WAS TRACKING A STRONG
THUNDERSTORM 16 MILES SOUTHEAST OF BLUE EARTH...OR 17 MILES NORTHWEST
OF LAKE MILLS. THIS STORM WAS MOVING EAST AT 15 MPH.

HAIL UP TO DIME SIZE AND WINDS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM.

* LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  BRICELYN.
  KIESTER.
  WALTERS.
  MANSFIELD.
  ALDEN.
  CONGER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS THUNDERSTORM COULD INTENSIFY QUICKLY...SO BE READY TO ACT IF A
WARNING IS ISSUED.

&&

LAT...LON 4370 9352 4350 9350 4350 9386 4359 9388
TIME...MOT...LOC 2013Z 251DEG 15KT 4356 9378

JLT