Severe Thunderstorm Warning 6, NWS Quad Cities, IA

386 
WWUS53 KDVN 282208 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
408 PM CST TUE FEB 28 2017

IAC031-045-163-282300-
/O.CON.KDVN.SV.W.0006.000000T0000Z-170228T2300Z/
Cedar IA-Scott IA-Clinton IA-
408 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR SOUTHEASTERN CEDAR...NORTHERN SCOTT AND CLINTON COUNTIES...

At 408 PM CST, a severe thunderstorm was located over Bennett, or 9 
miles north of Durant, moving east at 45 mph. A second severe 
thunderstorm was located near Scott County Park, moving east at 45 
mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Clinton, Tipton, Eldridge, DeWitt, Camanche, Princeton, Long Grove,
Wheatland, Cordova, Grand Mound, Calamus, Bennett, Donahue,
McCausland, Low Moor, Welton, Dixon, Goose Lake, Maysville and New
Liberty.

This includes Interstate 80 in Iowa between mile markers 268 and 282.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CST for northwestern
Illinois...and east central Iowa.

LAT...LON 4178 9024 4177 9028 4175 9031 4173 9032
      4169 9031 4168 9033 4167 9034 4160 9108
      4179 9115 4198 9031
TIME...MOT...LOC 2208Z 254DEG 40KT 4174 9092 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

RP KINNEY

186 
WWUS53 KDVN 282226 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
426 PM CST TUE FEB 28 2017

IAC031-045-163-282300-
/O.CON.KDVN.SV.W.0006.000000T0000Z-170228T2300Z/
Cedar IA-Scott IA-Clinton IA-
426 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR SOUTHEASTERN CEDAR...NORTHERN SCOTT AND CLINTON COUNTIES...

At 426 PM CST, a severe thunderstorm was located near Wilton, or 7
miles northwest of Durant, moving east at 45 mph. 

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Clinton, Tipton, Eldridge, DeWitt, Camanche, Princeton, Long Grove,
Wheatland, Cordova, Grand Mound, Calamus, Bennett, Donahue,
McCausland, Low Moor, Welton, Dixon, Goose Lake, Maysville and New
Liberty.

This includes Interstate 80 in Iowa between mile markers 268 and 282.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CST for northwestern
Illinois...and east central Iowa.

LAT...LON 4178 9024 4177 9028 4175 9031 4173 9032
      4169 9031 4168 9033 4167 9034 4160 9108
      4179 9115 4198 9031
TIME...MOT...LOC 2226Z 263DEG 40KT 4165 9105 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

RP KINNEY

412 
WWUS53 KDVN 282237
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
437 PM CST TUE FEB 28 2017

IAC031-045-163-282300-
/O.CON.KDVN.SV.W.0006.000000T0000Z-170228T2300Z/
Cedar IA-Scott IA-Clinton IA-
437 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR SOUTHEASTERN CEDAR...NORTHERN SCOTT AND SOUTHEASTERN CLINTON
COUNTIES...

At 437 PM CST, a severe thunderstorm was located near Durant, moving
east at 45 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...
Clinton, Eldridge, DeWitt, Camanche, Princeton, Long Grove,
Wheatland, Cordova, Grand Mound, Calamus, Bennett, Donahue,
McCausland, Low Moor, Dixon, Maysville, New Liberty, Malone, Folletts
and Camp Conestoga.

This includes Interstate 80 in Iowa between mile markers 275 and 282.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CST for northwestern
Illinois...and east central Iowa.

LAT...LON 4178 9024 4177 9028 4175 9031 4173 9032
      4169 9031 4168 9033 4167 9034 4161 9096
      4178 9103 4198 9031
TIME...MOT...LOC 2237Z 256DEG 40KT 4168 9089 

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

RP KINNEY

982 
WWUS53 KDVN 282241
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
441 PM CST TUE FEB 28 2017

IAC031-045-282251-
/O.CAN.KDVN.SV.W.0006.000000T0000Z-170228T2300Z/
Cedar IA-Clinton IA-
441 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CEDAR AND
SOUTHEASTERN CLINTON COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CST for northwestern
Illinois...and east central Iowa.

LAT...LON 4167 9034 4162 9090 4177 9090 4177 9079
      4174 9075 4174 9071 4177 9067 4176 9062
      4177 9059 4176 9058 4177 9054 4177 9047
      4176 9046 4176 9044 4173 9041 4173 9036
      4174 9034 4173 9032 4169 9031
TIME...MOT...LOC 2241Z 256DEG 40KT 4169 9083 

$$

IAC163-282300-
/O.CON.KDVN.SV.W.0006.000000T0000Z-170228T2300Z/
Scott IA-
441 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR NORTHERN SCOTT COUNTY...

At 441 PM CST, a severe thunderstorm was located 7 miles north of
Walcott, or 7 miles northeast of Durant, moving east at 45 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...
Eldridge, Princeton, Long Grove, Cordova, Donahue, McCausland, Dixon,
Maysville, New Liberty, Park View, Camp Conestoga, Princeton Wildlife
Area, Scott County Park, Plainview and Big Rock.

This includes Interstate 80 in Iowa between mile markers 279 and 282.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CST for northwestern
Illinois...and east central Iowa.

LAT...LON 4167 9034 4162 9090 4177 9090 4177 9079
      4174 9075 4174 9071 4177 9067 4176 9062
      4177 9059 4176 9058 4177 9054 4177 9047
      4176 9046 4176 9044 4173 9041 4173 9036
      4174 9034 4173 9032 4169 9031
TIME...MOT...LOC 2241Z 256DEG 40KT 4169 9083 

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

RP KINNEY

420 
WWUS53 KDVN 282259
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
459 PM CST TUE FEB 28 2017

IAC163-282309-
/O.EXP.KDVN.SV.W.0006.000000T0000Z-170228T2300Z/
Scott IA-
459 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SCOTT COUNTY WILL
EXPIRE AT 500 PM CST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A tornado watch remains in effect until 1000 PM CST for northwestern
Illinois...and east central Iowa.

LAT...LON 4167 9034 4162 9090 4177 9090 4177 9079
      4174 9075 4174 9071 4177 9067 4176 9062
      4177 9059 4176 9058 4177 9054 4177 9047
      4176 9046 4176 9044 4173 9041 4173 9036
      4174 9034 4173 9032 4169 9031
TIME...MOT...LOC 2259Z 256DEG 40KT 4173 9061 

$$

RP KINNEY

Area Forecast Discussion
National Weather Service Quad Cities IA IL
343 PM CST Tue Feb 28 2017

.SYNOPSIS...
Issued at 330 PM CST Tue Feb 28 2017

As of 2 PM...1000mb sfc low positioned between Des Moines and
Cedar Rapids. To the SE, incredibly mild and moist late February
air mass has overspread E Iowa/NW Illinois. Temps are between
65-70 F (dewpoints in the mid/upper 50s) along/south of highway
30.

SPC Mesoanalysis displayed 1000-1500 MUCAPE and near 50 kt effective
bulk shear over the forecast area, becoming largely sfc-based across
SW half of the area. Storms are expected to pop up near or just east
of the sfc low close to 3 PM, then spread ENE with time.

&&

.SHORT TERM...(This Evening and tonight)
ISSUED AT 330 PM CST Tue Feb 28 2017

Late Afternoon through this Evening:

There is a risk for severe thunderstorms along/east of a Sigourney,
IA to Galena, IL line. The greatest risk is along and SE of a
Kahoka, MO to Geneseo, IL to far SE Whiteside Co. line where the
Storm Prediction Center has an enhanced risk. The main threats are
damaging winds around 60 mph and hail up to golf ball size.
Tornadoes are also possible, especially with the strongest storms
which will be supercells. Thunderstorms are forecast to remain
scattered, therefore not every location will be impacted by strong
or severe storms.

Being the last day of February, the synoptic environment is
anomalously warm and moist across E Iowa/NW Illinois. Sfc temps and
dewpoints in the 60s and upper 50s (respectfully) will push
instability into the 1000-2000 J/kg SBCAPE range. The forcing for
ascent and shear needed to develop and sustain rotating
storms/supercells are present in the form of an approaching sfc low
riding along a warm front, and 50 kts of effective deep layer shear.

Severe Storm Timing and Risk Areas:

LCLs near 500 meters, low LFCs, 30 kts of 0-1 km shear, and SRH near
200 m2/s2 are key ingredients supportive of a tornado risk. One
limiting factor, as displayed in forecast hodographs, is marginal
directional shear in the lowest 1 km for counties west of the Quad
Cities. Forecast storm motion per 850-300mb mean wind and forward
propagating Corfidi vectors is WSW to ENE around 50-60 mph.

In the counties along and east of the Mississippi R., sfc
winds are nearly due south as of the early afternoon and may back to
the SSE has convection forms NW of this area. Therefore, the
central/east-central counties of the forecast area have the higher
risk for tornadic supercells. This is where consecutive runs of the
HRRR have been showing a few robust swaths of 2-5 km max updraft
helicity from late afternoon supercells it's developing.

The greatest uncertainty with respect to storm coverage, or storms
affecting portions of the CWA, is with the secondary round that
forms along the cold front after 8-9 PM. The HRRR has consistently
been congealing this line to the E/SE of the DVN CWA.

Uttech

.LONG TERM...(Wednesday Night through Tuesday)
ISSUED AT 339 PM CST Tue Feb 28 2017

Wednesday...Upper trof acrs central IA, while main sfc low rolls
northeastward acrs lower MI, will drive secondary def zone type
precip band acrs the CWA Wed from west-to-east. Dynamical/top-down
cooling to produce rain to wet snow switch over as morning
progresses especially along and north of the HWY 20 corridor.  But
same processes to battle diurnal processes and lingering mild
boundary layer for awhile, and main be a rain-snow mix or all rain
on it's south flank for awhile. But some signs of heavier snow/
dendritic bursts along and north of HWY 20 and will go with a wet
inch to just under 2 inches of snow accum in those far northern
areas by Wed evening when the precip pulls out to the east. Less
than an inch from HWY 20 on down to HWY 30, with daytime melting and
compacting on lingering mild ground temps eating away at true snow.
Better snow accum potentail on elevated surfaces. Brisk
northwesterly gradient winds of 15 to 25 MPH and gusts to 35 MPH,
and highs in most areas in the upper 30s to lower 40s making for a
raw day to welcome in March. The far south will make it into the mid
40s with some breaks in the cloud cover. Cool night in the 20s into
Thu morning.

Thursday and Friday...a weak clipper for a wintry mix of light
precip on Thu under broad northwesterlies. then a more organized
system utilizing return flow convergence for another mixed precip
event Fri night.

Saturday and Sunday...Upstream thermal ridge still on track to build
east acrs the region over the weekend, with highs in the 50s to low
60s on Sat, warming into the mid to upper 60s on Sunday except north
of HWY 30 where it looks cooler. mainly dry until possible light
rain system late Sunday into Sunday night.

Next Monday and Tuesday...Latest medium range models roll out a
large cyclone acrs the Midwest this period, with mild weather and
showers/some storms possible on it's mild side late Mon into Mon
night. Cooler with rain possibly changing to snow in the north on
Tue.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday Afternoon)
ISSUED AT 1150 AM CST Tue Feb 28 2017

Low pressure system will bring a round of showers and thunderstorms
this afternoon and evening. There is a risk for strong or severe
storms at KMLI and KBRL. However, coverage is expected to remain
scattered and storms may not congeal into a line until they are
east of KMLI/KBRL. For ceilings, anticipate deteriorating
conditions tonight behind the cold front. IFR most likely at
KDBQ/KCID. Wrap around moisture Wednesday morning will change to
snow at KDBQ/KCID. Minor accumulations are possible probably after
18Z/Wednesday at KDBQ. Uttech

&&

.HYDROLOGY...
Issued at 330 PM CST Tue Feb 28 2017

Many area rivers continue to be on the rise due to recent rainfall
locally, and routed water from upstream due to both rainfall and
snow melt to the north. Additional rainfall amounts from this
afternoon through tomorrow morning will range from around a
quarter inch, to over three quarters of an inch. The higher
amounts will occur under the thunderstorms and be localized.
Taking this all into account and the routed water coming from
upstream, with somewhat higher confidence have upgraded the river
flood watches to warnings for the Mississippi sites at Rock
Island, Muscatine, New Boston, and Keithsburg. Additionally, have
upgraded Gladstone and Burlington to Major flood stage by early
next week. These southern sites river levels become enhanced from
flow input/contribution from the Iowa/Cedar Rivers. Have gone with
a river flood watch for Fulton and IL City on the Mississippi
with lower confidence that they may just reach flood stage or fall
just short late in the coming weekend.

As for the tributaries, confidence is high enough in the routed
water from upstream along with some rainfall tonight, to upgrade the
Wapsipinicon River near De Witt to a flood warning. Forecast has it
falling just short of moderate flood stage later Thu night, and will
have to watch trends of a possible higher crest getting into the
moderate category. Rises near or above action stage still expected
on portions of the Iowa and Cedar Rivers, with Conesville on the
Cedar cresting now above flood stage. Projected rainfall through
Wednesday morning may push both Joslin and Moline on the Rock River
above action stage Fri into Sat.   ..12..

&&

.CLIMATE...
ISSUED AT 330 PM CST Tue Feb 28 2017

Record Highs for today February 28...

Moline.........66 in 2016
Cedar Rapids...64 in 1932
Dubuque........62 in 1895
Burlington.....69 in 1932

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.
&&

SYNOPSIS...Uttech
SHORT TERM...Uttech
LONG TERM...12
AVIATION...Uttech
HYDROLOGY...12
CLIMATE...Uttech

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
247 PM CST Tue Feb 28 2017

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-012100-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
247 PM CST Tue Feb 28 2017

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...THIS AFTERNOON AND TONIGHT

This afternoon and evening, a strong cold front will sweep across
the outlook area. Scattered severe storms are likely. The primary
threats are hail around golfball size and damaging wind gusts
around 70 mph. Isolated tornadoes are also possible. Severe
weather is most favored from 3 pm to 10 pm. Storm speeds around
50 mph will leave little time to take shelter. Remain alert for
later statements and warnings.

Area rivers are experiencing flooding. Please see the
latest Flood Statements and Flood Warnings for details.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Snow showers are likely across east central Iowa and northwest
Illinois Wednesday. Accumulations around an inch or two are
possible along the highway 20 corridor. This will cause slick
roads and brief periods of low visibility.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely this afternoon and evening.

RP Kinney

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
343 PM CST TUE FEB 28 2017

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

0343 PM     HAIL             WOODHULL                41.18N 90.32W
02/28/2017  E0.25 INCH       HENRY              IL   EMERGENCY MNGR

            HEAVY RAIN AND PEA SIZED HAIL.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
348 PM CST TUE FEB 28 2017

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

0348 PM     HAIL             NEW LIBERTY             41.72N 90.88W
02/28/2017  E0.25 INCH       SCOTT              IA   AMATEUR RADIO

            PEA SIZED HAIL.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
349 PM CST TUE FEB 28 2017

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

0348 PM     HAIL             5 S IOWA CITY           41.59N 91.54W
02/28/2017  M0.25 INCH       JOHNSON            IA   TRAINED SPOTTER

&&

DC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
352 PM CST TUE FEB 28 2017

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

0352 PM     HAIL             2 ESE NEW WINDSOR       41.19N 90.42W
02/28/2017  M0.75 INCH       HENRY              IL   TRAINED SPOTTER

            DIME SIZED HAIL OCCURRING RIGHT NOW.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
356 PM CST TUE FEB 28 2017

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

0355 PM     HAIL             1 WSW IOWA CITY         41.65N 91.55W
02/28/2017  E0.75 INCH       JOHNSON            IA   TRAINED SPOTTER

            ESTIMATED PENNY SIZED HAIL ON THE WEST SIDE OF IOWA CITY.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
358 PM CST TUE FEB 28 2017

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

0357 PM     HAIL             SE IOWA CITY            41.66N 91.54W
02/28/2017  E0.88 INCH       JOHNSON            IA   TRAINED SPOTTER

            ESTIMATED DIME TO NICKEL SIZED HAIL ON THE SOUTHEAST SIDE
            OF IOWA CITY RIGHT NOW. HAIL IS COVERING THE GROUND.

&&