Severe Thunderstorm Warning 85, NWS Des Moines, IA

408 
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SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
323 PM CDT WED JUN 6 2018

IAC025-151-062100-
/O.CON.KDMX.SV.W.0085.000000T0000Z-180606T2100Z/
Pocahontas IA-Calhoun IA-
323 PM CDT WED JUN 6 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHERN POCAHONTAS AND NORTHERN CALHOUN COUNTIES...

At 323 PM CDT, a severe thunderstorm was located 9 miles northwest of
North Twin Lake, or 9 miles south of Pocahontas, moving south at 5
mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Manson, North Twin Lake, Pomeroy, Fonda, Twin Lakes, Palmer, Varina,
Jolley and Twin Lakes State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4270 9491 4267 9444 4248 9444 4247 9486
      4247 9491 4263 9492
TIME...MOT...LOC 2023Z 339DEG 5KT 4260 9473 

HAIL...1.00IN
WIND...60MPH
 
$$

Beerends

134 
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Severe Weather Statement
National Weather Service Des Moines IA
337 PM CDT WED JUN 6 2018

IAC025-151-062100-
/O.CON.KDMX.SV.W.0085.000000T0000Z-180606T2100Z/
Pocahontas IA-Calhoun IA-
337 PM CDT WED JUN 6 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHERN POCAHONTAS AND NORTHERN CALHOUN COUNTIES...

At 336 PM CDT, a severe thunderstorm was located 7 miles northwest of
North Twin Lake, or 11 miles south of Pocahontas, moving south at 10 
mph. A second severe storm is located 2 miles northwest of Varina 
moving south southeast at around 10 mph. 

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Manson, North Twin Lake, Pomeroy, Fonda, Twin Lakes, Palmer, Varina,
Jolley and Twin Lakes State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4270 9491 4267 9444 4248 9444 4247 9486
      4247 9491 4263 9492
TIME...MOT...LOC 2036Z 338DEG 9KT 4258 9472 

HAIL...1.00IN
WIND...60MPH
 
$$

Beerends

757 
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SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
357 PM CDT WED JUN 6 2018

IAC025-151-062107-
/O.EXP.KDMX.SV.W.0085.000000T0000Z-180606T2100Z/
Pocahontas IA-Calhoun IA-
357 PM CDT WED JUN 6 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN POCAHONTAS AND
NORTHERN CALHOUN COUNTIES WILL EXPIRE AT 400 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central, north central, northwestern and west central Iowa.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Calhoun County until 4:30 pm CDT. 

LAT...LON 4270 9491 4267 9444 4248 9444 4247 9486
      4247 9491 4263 9492
TIME...MOT...LOC 2057Z 339DEG 5KT 4255 9471 

$$

Beerends

Area Forecast Discussion
National Weather Service Des Moines IA
254 PM CDT Wed Jun 6 2018

.DISCUSSION.../Tonight through Wednesday/
Issued at 253 PM CDT Wed Jun 6 2018

Iowa is just downstream of the upper ridge axis across the Plains in
an area of good warm advection and moisture advection.  Strong
instability has developed into the western half of Iowa this
afternoon as temperatures and dewpoints have quickly risen. Surface
boundary is pushing into northern Iowa with a weak shortwave
crossing through South Dakota along with some associated forcing.
This setup is the main concern in the short term with the potential
for severe convection late this afternoon into tonight. Latest GOES-
16 visible imagery is showing agitated cumulus near Storm Lake
and cap is likely to break within an hour or two as the updrafts
continue to strengthen and the front approaches. Given the strong
instability, rapid development is expected once initiation occurs.
However, shear is modest at best with effective bulk shear around
25- 35kts across much of the area. Despite this lack of stronger
shear, the strong instability should be more than sufficient for
severe hail production. Downdraft CAPES are also robust with
values of 1200-1400 adding the wind threat component as well. Any
tornado potential is likely to be early in the event with initial
strong updrafts stretching out any available surface vorticity
near the boundary. As gusts fronts consolidate into the evening,
the system is likely to become a forward propagating line moving
southeast through central into southern Iowa during the evening
with hail and winds the main threat. Heavy rains will also occur
given PWATs approaching 1.5 inches although as the system become
more progressive, the overall threat for flash flooding is
expected to remain limited, although urban areas are always
concerning in high rate events.

This convective complex is expected to pass out of southern Iowa
this evening.  However, main low level flow will continue to be
focused just west of the forecast area in Nebraska as southeast
South Dakota overnight with convection continuing in those
locations.  Upper flow will likely carry some of this convection
into western areas overnight with additional rainfall and some
limited severe threat persisting through sunrise.

Another round of convection is expected from later Thursday
afternoon into Friday morning as a shortwave passes through the
Plains and toward the state.  There remains the potential for severe
weather during this time along with heavy rain although detail
remain somewhat sketchy as the convection tonight into early
Thursday will impact Thursday afternoons outcome.  The potential for
additional periods of convection persist into the weekend and
especially later Monday into Monday night as the main shortwave
passes through the state.  Temperatures will be at the mercy of
convection, although with no push of colder air until early next
week, readings will remain mostly above normal.

&&

.AVIATION.../For the 18Z TAFS through 18Z Thursday afternoon/
Issued at 1235 PM CDT Wed Jun 6 2018

Morning convection has waned and focus is now on redevelopment
this afternoon, likely toward 21z along or south of Highway 20.
Storms will then propagate southeast or south with uncertainty
still around on exact timing and impacts, but likely will be
gusty and variable winds and restrictions to visibility and
ceilings. These storms should exit the area later this evening,
but may see new storms approach from the west after 6z, which is
not currently reflected in the official TAFs with low confidence.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

DISCUSSION...Cogil
AVIATION...Ansorge

Hazardous Weather Outlook
National Weather Service Des Moines IA
456 AM CDT Wed Jun 6 2018

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-071000-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
456 AM CDT Wed Jun 6 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Scattered strong to severe thunderstorms are anticipated today
into tonight. The main threat is likely to be large hail and
damaging winds. Heavy rain is also possible with these storms
today and tonight.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

An active weather pattern looks to persist Thursday into the
weekend. A few severe storms are possible on Thursday and Friday
where the main threat appears to be hail and winds. The heavy rain
potential also exists Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotters might be needed Today and at times Thursday into the
weekend.

KLP

Special Weather Statement
National Weather Service Des Moines IA
933 AM CDT WED JUN 6 2018

IAZ024-025-035-061500-
Humboldt IA-Wright IA-Webster IA-
933 AM CDT WED JUN 6 2018

...Dime to Nickel Sized Hail...

At 933 AM CDT, Doppler radar was tracking a strong thunderstorm near
Humboldt, or near Dakota City, moving east at 40 mph.

Nickel size hail and periods of heavy rain will be possible with
this storm.

Locations impacted include...
Fort Dodge, Dakota City, Humboldt, Eagle Grove, Fort Dodge Regional
Airport, Goldfield, Badger, Thor, Vincent, Clare, Rutland, Pioneer,
Frank A Gotch State Park, Eagle Grove Municipal Airport and Humboldt
Municipal Airport.

LAT...LON 4274 9387 4245 9406 4261 9444 4265 9444
      4280 9435
TIME...MOT...LOC 1433Z 286DEG 36KT 4269 9427

Curtis

Special Weather Statement
National Weather Service Des Moines IA
1002 AM CDT WED JUN 6 2018

IAZ025-035-036-061545-
Hamilton IA-Wright IA-Webster IA-
1002 AM CDT WED JUN 6 2018

...Up to Nickel Hail and Gusty Winds...

At 1001 AM CDT, Doppler radar was tracking a strong thunderstorm near
Eagle Grove, or 11 miles northwest of Webster City, moving east at 30
mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Webster City, Eagle Grove, Big Wall Lake, Williams, Blairsburg,
Kamrar, Vincent, Woolstock, Eagle Grove Municipal Airport and
Sportsman Park.

LAT...LON 4263 9350 4248 9350 4232 9358 4255 9409
      4264 9402 4265 9397 4271 9397 4273 9396
TIME...MOT...LOC 1501Z 290DEG 28KT 4261 9393

Curtis

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1100 AM CDT WED JUN 6 2018

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

1035 AM     HAIL             4 SSE FONDA             42.53N 94.81W
06/06/2018  E1.00 INCH       CALHOUN            IA   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED QUARTER SIZED HAIL
            AT THEIR HOME.

&&