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Aug. 9-17 Heavy Rain/Flood Threat


snowlover2

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11 hours ago, Chambana said:

Looks like the wpc map is going to nail the heaviest axis, rainfall getting going in southern Illinois/Indiana. I picked up a much needed 1.2" of rainfall last night, brought the grass out of semi dormancy. 

 

Wow Springfield killed it last night, 5.68"! 

Yeah, lots of flooding issues at the state fair and nearby campgrounds. Saw a photo with many trucks and campers flooded in 4+ feet of water. 

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wow..

 

12z NAM very wet for IL/IND 8 inche bullseye at 48 hr's

and a moderate rain band is already over the area not handled well by models

 

It has been dry over western IND (ie LAF area) and eastern IL but not just SE of there

 

IND metro area may be in trouble if the band sets up just SE of the 12z NAM

already in steady moderate rain all morning

 

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HIGH RISK OF RAINFALL EXCEEDING FFG TO THE RIGHT OF A LINE FROM   10 NNW HSB 20 SW CGI 10 WSW ARG 25 W BVX FLP 15 SSW TBN   10 W ALN 20 ENE 1H2 AJG 10 NNW HSB.     LOWER TO MID MS VALLEY INTO THE OHIO VALLEY   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  

 

ANOMALOUS MOISTURE -- PRECIPITABLE WATER VALUES 2 TO 3 SIGMAS   ABOVE THE MEAN (OVER THE 90TH PERCENTILE) FOR MID AUGUST --   COMBINED WITH ADEQUATE DEEP-LAYER INSTABILITY AND COUPLED   DYNAMICAL FORCING AHEAD OF THE UPPER TROUGH AND WITHIN THE RIGHT   ENTRANCE REGION OF THE JET STREAK TO THE N-NE WILL POSE A   CONTINUED RISK OF EXCESSIVE SHORT-TERM RAINFALL RATES TODAY AND   TONIGHT NEAR A FRONTAL ZONE. A MULTI-DAY HEAVY RAINFALL EVENT   (INTO TUE) IS EXPECTED AHEAD OF A SLOW-MOVING UPPER TROUGH AND   SURFACE FRONTAL BOUNDARY. PERSISTENT LOW-LEVEL CONFLUENT FLOW INTO  

 

THE SURFACE FRONT ON THE WESTERN PERIPHERY OF THE BROAD   SUBTROPICAL RIDGE AND AHEAD OF THE APPROACHING UPPER TROUGH WILL   RESULT IN 850 MB MOISTURE FLUX ANOMALIES BETWEEN 3-4 STANDARD   DEVIATIONS ABOVE THE NORM, FIRST ACROSS THE LOWER MS VLY EARLY IN   THE PERIOD THEN LIFTING NORTHWARD INTO THE MID MS VALLEY LATE   (00-12Z MON).     IN TERMS OF THE MODEL QPF TRENDS, THERE CONTINUES TO BE A   NORTHWARD SHIFT WITH THE MAIN RAINFALL AXIS. FOR THIS OUTLOOK,   UTILIZED THE 12Z WPC CONTINUITY, INDICATIONS FROM 06Z GFS MASS   FIELDS, AS WELL AS IDEAS FROM THE 03Z AND 09Z SREF MEAN TO NUDGE   THE SLIGHT AND MODERATE THREAT AREAS NORTHWARD.

 

THE MARGINAL RISK   AREA EXPANDED QUITE A BIT NORTHWARD INTO NORTHERN IL AND TO THE   IN/OH BORDER WITH MI TO ACCOUNT FOR THE MODEL SPREAD. AS HOURLY   RAIN RATES COULD REACH 2.5", THE SIGNAL IN THE MESOSCALE GUIDANCE   FOR LOCAL AMOUNTS IN THE 4-7" RANGE THROUGH MONDAY 12Z LOOKS   REASONABLE. PER COORDINATION WITH THE LITTLE ROCK AR, ST. LOUIS   MO, PADUCAH KY, AND LINCOLN IL FORECAST OFFICES, ADDED A HIGH RISK   FOR AREAS OF SOUTHERN IL, SOUTHEAST AR, AND NORTH-CENTRAL AR WHERE   RAINFALL FROM YESTERDAY HAS GENERALLY SATURATED SOILS.  

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40 minutes ago, HillsdaleMIWeather said:

All the 12Z GFS and NAM tell me is that is that regardless of training, it's gonna be pretty interesting. And also to be glad I live on a Hill.

 

 

We have a modern drain system here... It could rain 5 feet and we would be fine. It's older developments that suffer.

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