Latest RAP Model Guidance Update 11:00 PM

There will be a small break in storms in eastern Iowa before the showers/storms in western Iowa arrive later tonight.

Apr 9 RAP

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Posted under Update

This post was written by Schnack on April 9, 2013

Weather Update 9:15 PM

Apr 9 Radar

 

Low pressure is located in eastern Kansas with a warm front northeast across the Iowa/Missouri state line. Showers and thunderstorms have been developing in central Iowa this evening and are moving northeast. There has been isolated severe storms in far north central Iowa and southern Minnesota. Showers and thunderstorms are expected to become widespread overnight and into early Wednesday morning across eastern Iowa. The freezing rain in northwest  Iowa will track northeast and stay in western Iowa. Locally heavy downpours are expected in eastern Iowa with a slight chance of a strong storm or marginally severe overnight. Hail and high wind would be the threat.

There is still a wide range in temperatures at this hour across Iowa. Temperatures are in the low 70s across SE Iowa…while in NW Iowa temperatures are in the low 30s with thunderstorms, sleet and freezing rain.

Apr 9 Temps

 

The forecast from earlier this evening is still on track. Click here.

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Posted under Update

This post was written by Schnack on April 9, 2013

Isolated Severe Possible

Apr 9 mcd0416
MESOSCALE DISCUSSION 0416
   NWS STORM PREDICTION CENTER NORMAN OK
   0737 PM CDT TUE APR 09 2013

   AREAS AFFECTED...MUCH OF IA...EXTREME SRN MN

   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

   VALID 100037Z - 100200Z

   PROBABILITY OF WATCH ISSUANCE...20 PERCENT

   SUMMARY...ISOLATED LARGE HAIL WILL BE POSSIBLE WITH ELEVATED
   THUNDERSTORMS THIS EVENING OVER MUCH OF IA AND EXTREME SRN MN. WW
   DOES NOT APPEAR NECESSARY ATTM.

Click here for the technical discussion.
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Posted under Severe Weather

This post was written by Schnack on April 9, 2013

Daily Rain Records Broken

Showers and thunderstorms pushed through eastern Iowa last night and this morning with some locations receiving more than 1″. Here is a map showing the rain estimate.

Apr 9 Rain Total Map

Waterloo and Dubuque broke daily rain records today.

Waterloo: 1.26 (old record 1.25 in 1919)
Dubuque: 2.66″ (old record 1.06 in 1890)

The rain totals might be a bit higher since there is a chance of rain before midnight.

Here is more information about the Dubuque rain totals.

Apr 9 DBQ Rain 2

 

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Posted under Records

This post was written by Schnack on April 9, 2013

Weather Hot Shots on Tue. April 9

Submit your weather Hot Shot by clicking here.
One photo is shown on the 5 pm newscast and one on the 10 pm newscast.

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Posted under Hot Shots, Photo

This post was written by Schnack on April 9, 2013

More Soggy Weather Tonight and Wednesday


UPDATED at 4:00 PM

Tonight:  Cloudy and windy with a 90% chance of showers/storms. Low: 34-47. Wind: NE 15-25 mph.

Wednesday: Cloudy and windy with a 90% chance of showers/storms. High: 37-51. Wind: N 15-25 mph.

Wednesday Night: Cloudy and breezy with a 70% chance of rain/snow. Low: 31-38. Wind: N 10-20 mph.

Thursday: Cloudy with a 50% chance of rain/snow. High: mid-upper 30s.

Friday: Mostly cloudy with a few morning flurries. High: mid 30s.

Saturday: Partly cloudy. High: upper 40s.

Sunday: Mostly cloudy with a 50% chance of showers/storms. High: near 50.

Monday: Mostly cloudy. High: mid 50s.

Tuesday: Mostly cloudy with a 20% chance of showers. High: upper 40s.

There is a warm front across southern Iowa providing a wide range in temperatures from north to south. Here are the temperatures from 2pm today.

Blog Graphic 3
Isolated showers/storms are possible this evening with more widespread showers/storms overnight. Locally heavy rain is possible with these storms. The Storm Prediction Center has outlined a slight risk area (yellow) of severe weather across southern Iowa overnight. The main threat will be large hail and high wind. Here is the outlook for tonight.

 Apr 9 Severe Wx Risk

In addition to the hail and wind threat…there is a chance of flash flooding. The area saw heavy rain last night with many locations getting more than 1”. Here are some of the reports.

Apr 9 Rain Total
There is chance for an additional 1-2” tonight and tomorrow. That is the reason for a FLASH FLOOD WATCH for east central and southeast Iowa tonight through Thursday morning.

Blog Graphic 5
Here is the WPC forecast position of the surface low at 1pm Wednesday.

Apr 9 1pm Sfc Wed Sfc Map
As the surface low moves northeast into Illinois Wednesday night colder air will wrap in behind it. The colder air will also arrive with upper level low as it crosses Iowa Wednesday night and Thursday.Temperatures will drop into the low 30s giving us a chance for the rain to mix and possibly change to snow.  Here is the 500 mb map for Thursday morning.Apr 9 500 mb Map
If there is a complete changeover it would be more likely areas along and north of Highway 20 Wednesday night and Thursday morning. Here is the chance of 1” of snow Wednesday evening to Thursday evening.

Apr 9 1inch Snow
Thursday and Friday will be cold with highs in the 30s. High pressure Saturday will bring more sunshine to the area for a short period of time. We are tracking another area of low pressure to bring us a chance of showers/storms Sunday. Here is the WPC forecast map for Sunday morning.

Apr 9 Sun AM Sfc Map

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Posted under Forecast Discussion

This post was written by Schnack on April 9, 2013

24 Hour Rain Totals

rain

 

 

 

 

7 AM Monday to 7 AM Tuesday

Location County Rain
Waterloo Black Hawk 0.75
Dubuque Dubuque 2.22
Cedar Rapids Linn 1.02
Iowa City Johnson 0.27
Anamosa 3SSW, IA Jones 0.70
BELLE PLAINE, IA Benton 1.40
CASCADE, IA Dubuque 1.22
Cedar Falls Black Hawk 0.84
CHARLES CITY, IA Floyd 0.31
CLERMONT, IA Fayette 0.21
COGGON, IA Linn 1.11
CONRAD, IA Grundy 1.97
CRESCO 1NE, IA Howard 0.24
Dubuque #3, IA Dubuque 1.73
Dubuque L&D 11, IA Dubuque 0.88
ELKADER 6SSW, IA Clayton 0.62
FAYETTE, IA Fayette 0.37
FULTON, IA Jackson 0.94
GRUNDY CENTER, IA Grundy 1.54
GUTTENBERG L & D 10, IA Clayton 0.67
HAMPTON, IA Franklin 0.43
IOWA FALLS, IA Hardin 0.81
LOWDEN, IA Cedar 0.30
MANCHESTER NO. 2, IA Delaware 0.99
MAQUOKETA 4 W, IA Jackson 0.70
Monona WWTP, IA Clayton 0.31
Monticello, IA Jones 0.96
NEW HAMPTON, IA Chickasaw 0.26
NORTH ENGLISH, IA Iowa 0.14
OSAGE , IA Mitchell 0.32
ST ANSGAR, IA Mitchell 0.26
STANLEY 4 W, IA Buchanan 0.65
STRAWBERRY POINT, IA Clayton 0.60
TOLEDO 3 N, IA Tama 0.15
TRIPOLI, IA Bremer 0.35
VINTON, IA Benton 1.05
VOLGA 1NE, IA Clayton 0.62
WASHINGTON, IA Washington 0.01
WILLIAMSBURG 3 SE, IA Iowa 0.84
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Posted under Precipitation Totals

This post was written by Schnack on April 9, 2013

April 9

TodayinWeatherHistoryFrom NWS
1988
: A very strong cold front passed through northwestern Iowa producing snowfall just one day after temperatures had peaked in the 80s. On the 8th the temperature reached a daily record high 88 F at Sioux City, 87 F at Le mars, and 83 F at Sibley. On the 9th those same locations received 2.1, 1.5, and 2.0 inches of snow respectively.

This Day in National/World Weather History …
 9 April 1947 → A tornado family destroyed Glazier, TX and much of Higgins, TX before it hit Woodward, OK. The family traveled 170 miles, killed 181 people, and injured 970.
 9 April 1953 → The first radar image of a tornado was detected at the University of Illinois airport in Champaign, IL. The radar displayed a hook echo.
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Posted under Weather History

This post was written by Schnack on April 9, 2013