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Aug. 23-31 Storms/Heavy Rain Thread


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Parts of the subforum, including here in Springfield, might be approaching or breaking August rainfall records with the upcoming storm systems, especially Wednesday-Thursday. 

SPI currently at 8.14 inches for August (including the 5.99 in less than 6 hours the night of 8/12, and 1.66 on 8/15).  The August record is 8.37 set in 1981--and that's likely going down.

WPC's latest 7-day QPF: p168i.gif?1471921268
 

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And even though the small Slight risk for tomorrow is currently confined mainly to W IA and E Nebraska, all of MN and W WI are in the Marginal for tomorrow:

http://www.spc.noaa.gov/products/outlook/day2otlk.html

...EASTERN NEB...NORTHEAST KS...WESTERN/CENTRAL IA...NORTHERN
   MO...FAR SOUTHEAST SD...
   THE EASTWARD SHIFT OF THE LARGE SURFACE ANTICYCLONE ACROSS THE
   EASTERN STATES ON TUESDAY IS EXPECTED TO SUPPORT CONTINUED POLEWARD
   MOISTURE RETURN /SURFACE DEW POINTS IN THE MID-UPPER 60S/...AHEAD OF
   THE APPROACHING COLD FRONT.  THIS MOISTURE SHOULD REACH EASTERN NEB
   TO THE MID MS VALLEY TUESDAY AFTERNOON...AND INTO EASTERN
   IA/NORTHWEST IL TO SOUTHERN MN AND SOUTHWEST WI TUESDAY NIGHT.  A
   WEAK LOBE OF VORTICITY/MIDLEVEL IMPULSE MAY PRECEDE THE PRIMARY
   NM/CO SHORTWAVE TROUGH TUESDAY MORNING...WITH MAINLY MIDLEVEL CLOUDS
   SPREADING ACROSS THE SLIGHT RISK AREA EARLY.  SURFACE HEATING IN THE
   WAKE OF THIS CLOUDINESS SHOULD ALLOW FOR MODERATE INSTABILITY FROM
   CENTRAL/NORTHEAST KS THROUGH EASTERN NEB...EASTERN SD...NORTHERN
   MO...SOUTHERN AND WESTERN IA INTO SOUTHWEST MN WITH MUCAPE UP TO
   2000 J/KG.  

   MODELS SUGGEST SOME WEAK SUBSIDENCE AND WARMING AROUND 500-MB IN THE
   WAKE OF THE EARLY PERIOD MIDLEVEL IMPULSE.  THIS COULD INHIBIT MORE
   ROBUST UPDRAFT DEVELOPMENT UNTIL MID-LATE AFTERNOON WITH THE ARRIVAL
   OF THE SECOND...STRONGER MIDLEVEL TROUGH AND COLD FRONT. 
   STRENGTHENING SOUTH/SOUTHWESTERLY LOW-LEVEL WINDS AND VERTICALLY
   VEERING WIND PROFILES SUGGEST SUPERCELLS MAY BE POSSIBLE WITH
   INITIAL STORM DEVELOPMENT ACROSS WESTERN PORTIONS OF THE SLIGHT
   RISK.  ALL SEVERE HAZARDS WILL BE POSSIBLE WITH THE INITIAL STORMS
   FROM TUESDAY AFTERNOON INTO EARLY EVENING.  FURTHER LOW-LEVEL
   MOISTENING/DESTABILIZATION WITH EAST-NORTHEAST EXTENT ACROSS IA AND
   FURTHER STRENGTHENING OF THE LLJ SUGGEST UPSCALE GROWTH WILL BE
   LIKELY WITH DAMAGING WINDS BECOMING THE GREATER SEVERE-WEATHER
   THREAT.

   ...EASTERN DAKOTAS/MN...
   THE AVAILABLE MOISTURE IS EXPECTED TO BE MORE LIMITED THAN FARTHER
   SOUTH...WHILE A PLUME OF STEEP MIDLEVEL LAPSE RATES EXTENDING ACROSS
   THE DAKOTAS TO MN SHOULD EFFECTIVELY CAP THE AIR MASS INTO THE
   AFTERNOON.  THE ARRIVAL OF THE COLD FRONT INTO THE EASTERN DAKOTAS
   LATE TUESDAY AFTERNOON AND HEIGHT FALLS WHICH SHOULD BE GREATER
   TUESDAY NIGHT SHOULD ALLOW FOR A FEW STORMS TO DEVELOP BETWEEN
   23/21-24/00Z.  THE APPROACH OF THE UPSTREAM CLOSED LOW/TROUGH SHOULD
   ALLOW FOR ADDITIONAL STORMS TO FORM FROM WEST-EAST TUESDAY
   EVENING...BUT EVENTUAL LOSS OF GREATER INSTABILITY SHOULD LIMIT THE
   POTENTIAL SEVERITY OF STORMS INTO TUESDAY NIGHT.

   ..PETERS.. 08/22/2016
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1 hour ago, Justin said:

We could certainly use a break.  Hopefully whatever happens around Puerto Rico with the invest will end up on the East Coast but I think there's a chance a Katrina or Ivan like track is possible... Ugh. 

Ridge looks to build over top for a while.  Question is how fast it breaks down.  Slower breakdown would obviously heighten the chance for a system to move farther westward into the Gulf.

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4 minutes ago, Indystorm said:

Having returned from a trip to Louisiana two weeks ago before the heaviest rains hit this is one time I hope the Euro is not the King.

It would almost be unthinkable if it heads there.  

Generally speaking, it's a potentially concerning setup even before it may head for the Gulf.  Synoptic setup is quite favorable for quick strengthening as it heads for Florida (assuming it hasn't been decimated by Hispaniola or something).

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Scattered little but heavy cells popped up over the area very early this morning.  I got a couple real nice cells with very heavy rain and good lightning/thunder.  My total was 1.43".  My August total is up to 6.63".

They really got nailed up in far northeast Iowa as a line of storms trained over them for hours.  The area near Decorah received up to 8.5".  It seems like every storm event this summer has dropped 4-8 inches on somebody.

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This storm cell in west central MO, which if it holds could reach the Springfield area around 3AM (according to WICS-20's 9PM news on sister Fox station WRSP-55 here in Springfield) have prompted a Thunderstorm Warning in the Boonville, MO area.  There had been a Tornado Warning near that area earlier.  (Yes, they actually ran a Storm Tracker on that cell all the way to Springfield).

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1028 PM CDT WED AUG 24 2016

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PETTIS COUNTY IN CENTRAL MISSOURI...
  CENTRAL COOPER COUNTY IN CENTRAL MISSOURI...
  SOUTHEASTERN SALINE COUNTY IN CENTRAL MISSOURI...
  HOWARD COUNTY IN CENTRAL MISSOURI...

* UNTIL 1100 PM CDT

* AT 1027 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 11 MILES
  NORTHWEST OF PILOT GROVE...OR 13 MILES SOUTH OF MARSHALL...MOVING
  EAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
           TO ROOFS...SIDING...AND TREES.

* LOCATIONS IMPACTED INCLUDE...
  MARSHALL...BOONVILLE...FAYETTE...NEW FRANKLIN...PILOT GROVE...
  ROCHEPORT...NELSON...BLACKWATER...FRANKLIN...WOOLDRIDGE...
  ARROW ROCK AND LAMINE.

THIS INCLUDES INTERSTATE 70 IN MISSOURI BETWEEN MILE MARKERS 80 AND
114.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
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For today Aug. 25 SPC has placed the St. Louis area northeastward through central IL and IN in a slight risk of severe.  Winds seem more unidirectional today compared to yesterday when helicity was optimal but there is an MCV approaching from MO.  We'll see what happens.  Clear skies throughout much of the affected region at i p.m. EDT.   88/71 presently at Indpls.

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Interesting Special Weather Statement

THE NATIONAL WEATHER SERVICE AND LOCAL EMERGENCY MANAGEMENT WILL
CONTINUE TO CLOSELY MONITOR THE SITUATION. IF YOU OBSERVE A FUNNEL
CLOUD...STAY CALM AND SEEK SHELTER IN A STURDY BUILDING UNTIL THE
FUNNEL CLOUD HAS PASSED OR DISSIPATED. PLEASE REPORT ANY FUNNEL CLOUD
SIGHTINGS TO THE NORTHERN INDIANA  NATIONAL WEATHER SERVICE VIA LAW
ENFORCEMENT OR SOCIAL MEDIA.
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Just got back from having dinner with a friend in Speedway.  Had to take numerous detours because of flooded roads from a storm this evening.  From 6-7:10 p.m. Indianapolis airport picked up just under 2 inches of rain.  The Broad Ripple area was hit by strong straight line winds with numerous trees and branches down from this morning's storm with 20,000 customers out of power for a time.

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