Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS Springfield, MO

August 20, 2017Benton County, Missouri

NWS Springfield, MO issued this special weather statement at Aug 20, 2017, 6:02 PM CDT for Benton County, Missouri. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 20, 2017, 6:02 PM CDT (23:02 UTC)
Expired: Aug 20, 2017, 6:45 PM CDT
In force: 43 min
Issued by: NWS Springfield, MO

County Benton County, MO

The radar

The Pleasant Hill radar (KEAX), 85 km from the middle of the area, began a volume at 23:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.0 hours before the alert went out and 178 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3491 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Springfield, MO wrote its last area forecast discussion before this special weather statement went out at Aug 20, 5:52 PM CDT, 10 minutes earlier.

Area forecast discussion, Aug 20, 5:52 PM CDT, 10 minutes before

Area Forecast Discussion
National Weather Service Springfield MO
552 PM CDT Sun Aug 20 2017

.SHORT TERM...(This evening through Monday)
Issued at 217 PM CDT Sun Aug 20 2017

Convection is ongoing along the MO/AR border driven or triggered
by outflow boundaries. Another area of convection now over
northern MO is also expected to move southeast over the next few
hours. Evolution of this northern area of storms is a little more
up in the air, but HRRR does develop convection along a trailing
outflow boundary into our west central and central MO counties by
early evening. Some storms may also form along and nw-se oriented
boundary west of KSGF toward 00z. A strong instability/modest
shear environment will support a continued mention of isolated-
scattered strong/severe storms in our messaging with large
hail/downburst winds the main concerns. Looks like storms will
diminish by late evening.

Heat index values are reaching up to around 105 deg F over our
western counties at this time. No changes are planned to today's
heat advisory.

For Monday, more of the same with lots of low level moisture in
place, some scattered convection will still be possible. Eclipse
viewing will be a roll of the dice, with clouds likely to hamper
some areas. 18z forecast grids for Mon has 50-60% coverage in
general.

.LONG TERM...(Monday Night through Sunday)
Issued at 250 PM CDT Sun Aug 20 2017

A cold front will move through the area Tuesday with a good chance
for rain/tstms. Rain chances will initially push into our
northern counties late Mon night and spread quickly into the rest
of the area Tue morning. Overall instability looks hampered by
cloud cover at this point so the severe risk looks marginal. We
will need to monitor for heavy rain and flooding potential, but
given the progressive front, probably not looking at a widespread
flooding risk. WPC marginal day 3 (Tue) risk for excessive rain
looks appropriate.

It looks like a nice stretch of weather behind the front. We
could see at least a couple of nights with lows in the 50s with
lower dew points/humidity in a deep nw flow pattern and sfc high
pressure ridging. Some moisture return may lead to a return of a
chance of thunderstorms by Sunday as we transition to a weak zonal
upper level flow.

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 547 PM CDT Sun Aug 20 2017

Outflow boundary from this mornings convective complex has nearly
stalled out and was located from near Schell City to Greenfield to
Kimberling City. Convection has fired up in an area of instability
on the eastern edge of the outflow boundary over Cedar county
northwest of SGF. Am going to mention VCTS on the BBG TAF for a
couple hours this evening, but will leave SGF/JLN without mention
of CB or VCTS at this time. Expecting mainly VFR conditions
through the period, but areas which get under any thunderstorms
could drop into MVFR/IFR.

&&

.SGF WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 7 PM CDT this evening for MOZ066-077-088-093-
     101.

KS...Heat Advisory until 7 PM CDT this evening for KSZ073-097-101.

&&

SHORT TERM...DSA
LONG TERM...DSA
AVIATION...Lindenberg

Hazardous weather outlook, Aug 20, 12:57 PM CDT, 5 hours 5 minutes before

Hazardous Weather Outlook
National Weather Service Springfield MO
1257 PM CDT Sun Aug 20 2017

KSZ073-097-101-MOZ055>058-066>071-077>083-088>098-101>106-211800-
Bourbon-Crawford-Cherokee-Benton-Morgan-Miller-Maries-Vernon-
St. Clair-Hickory-Camden-Pulaski-Phelps-Barton-Cedar-Polk-Dallas-
Laclede-Texas-Dent-Jasper-Dade-Greene-Webster-Wright-Newton-
Lawrence-Christian-Douglas-Howell-Shannon-McDonald-Barry-Stone-
Taney-Ozark-Oregon-
1257 PM CDT Sun Aug 20 2017

This Hazardous Weather Outlook is for portions of the Missouri
Ozarks and extreme southeast Kansas.

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

  Limited Hail risk.
  Limited Thunderstorm wind damage risk.
  Limited Flooding risk.
  Limited Lightning risk.
  Elevated Excessive heat risk.

DISCUSSION...

Scattered thunderstorms will be possible through early this
evening with the best chances in counties along and east of a line
from Osceola to Cassville. Isolated severe storms will be capable
of damaging winds and golf ball sized hail. Slow moving storms
may also produce localized flash flooding.

A combination of afternoon temperatures in the lower 90s and
high humidity will create heat index values of 103 to 108 degrees
for extreme southwestern Missouri into southeast Kansas this
afternoon.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Periodic isolated to scattered showers and thunderstorms are
expected Monday. Heat index values may reach 100 to 104 across
areas of southeast Kansas into parts of southwest and west
central Missouri.

There will be a better chance for widespread showers and storms
Tuesday and Tuesday night with the passage of a cold front. A few
strong storms will be possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

More detailed information can be accessed at:
http://www.weather.gov/sgf/sitrep

This product in graphical format...along with other weather...
hydrological and climate information...at
http://www.weather.gov/sgf

DSA

In the hours before

Special weather statement, Aug 20, 12:12 PM CDT, 5 hours 50 minutes before

Special Weather Statement
National Weather Service Springfield MO
1212 PM CDT SUN AUG 20 2017

MOZ098-201800-
Shannon MO-
1212 PM CDT SUN AUG 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN SHANNON COUNTY UNTIL 100
PM CDT...

At 1212 PM CDT, Doppler radar was tracking a strong thunderstorm near
Summersville, or 19 miles north of Mountain View, moving east at 15
mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Current River State Park...       Eminence...
Summersville...                   Alley Spring...
Midridge...                       Round Spring...
West Eminence...                  Akers...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3707 9123 3712 9165 3739 9164 3742 9124
      3741 9118 3725 9116
TIME...MOT...LOC 1712Z 273DEG 14KT 3725 9158

Hatch

Special weather statement, Aug 20, 12:16 PM CDT, 5 hours 46 minutes before

Special Weather Statement
National Weather Service Springfield MO
1216 PM CDT SUN AUG 20 2017

MOZ083-098-201800-
Dent MO-Shannon MO-
1216 PM CDT SUN AUG 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN DENT COUNTY UNTIL 100 PM
CDT...

At 1216 PM CDT, Doppler radar was tracking a strong thunderstorm 14
miles south of Salem, moving east at 20 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Montauk State Park...             Bunker...
Turtle...                         Boss...
Jadwin...                         Howes Mill...
Darien...                         Stone Hill...
Gladden...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3759 9131 3751 9131 3750 9121 3742 9121
      3739 9164 3754 9168 3769 9115 3759 9116
TIME...MOT...LOC 1716Z 254DEG 18KT 3744 9156

Hatch

Special weather statement, Aug 20, 1:50 PM CDT, 4 hours 12 minutes before

Special Weather Statement
National Weather Service Springfield MO
150 PM CDT SUN AUG 20 2017

MOZ106-201930-
Oregon MO-
150 PM CDT SUN AUG 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN OREGON COUNTY UNTIL 230
PM CDT...

At 150 PM CDT, Doppler radar was tracking a strong thunderstorm near
Alton, or 18 miles northeast of Thayer, moving east at 5 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Alton...                          Couch...
Greer...                          Myrtle...
Wilderness...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3689 9131 3689 9122 3683 9122 3682 9111
      3650 9113 3650 9153 3651 9153
TIME...MOT...LOC 1850Z 275DEG 6KT 3672 9131

Hatch

Special weather statement, Aug 20, 5:15 PM CDT, 47 minutes before

Special Weather Statement
National Weather Service Springfield MO
515 PM CDT SUN AUG 20 2017

MOZ078-202300-
Cedar MO-
515 PM CDT SUN AUG 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CEDAR COUNTY UNTIL 600 PM
CDT...

At 515 PM CDT, Doppler radar was tracking a strong thunderstorm over
Stockton, moving northeast at 10 mph. Other storms were developing
south of Stockton moving northeast.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Stockton Lake...                  Stockton State Park...
Stockton...                       Umber View Heights...
Bearcreek...                      Caplinger Mills...
Wagoner...                        Cane Hill...
Arnica...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near Stockton Lake, get out of the water and move indoors
or inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3788 9381 3783 9381 3783 9363 3774 9363
      3774 9361 3757 9370 3758 9400 3774 9393
      3789 9383
TIME...MOT...LOC 2215Z 217DEG 9KT 3769 9384

Burchfield

Special weather statement, Aug 20, 5:32 PM CDT, 30 minutes before

Special Weather Statement
National Weather Service Springfield MO
532 PM CDT SUN AUG 20 2017

MOZ067-202315-
St. Clair MO-
532 PM CDT SUN AUG 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ST. CLAIR COUNTY
UNTIL 615 PM CDT...

At 531 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lowry City, or 13 miles south of Clinton. This storm was nearly
stationary.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Truman Lake...                    Lowry City...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near Truman Lake, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3820 9373 3820 9350 3814 9372 3821 9382
TIME...MOT...LOC 2231Z 232DEG 4KT 3819 9368

Burchfield

Special weather statement, Aug 20, 6:02 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Springfield MO
602 PM CDT SUN AUG 20 2017

MOZ055-202345-
Benton MO-
602 PM CDT SUN AUG 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BENTON COUNTY UNTIL
645 PM CDT...

At 602 PM CDT, Doppler radar was tracking a strong thunderstorm near
Windsor, moving northeast at 15 mph.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Ionia...                          Brandon...
Palo Pinto...

LAT...LON 3850 9329 3833 9352 3851 9351 3851 9330
TIME...MOT...LOC 2302Z 234DEG 15KT 3845 9352

Burchfield

The office that day

Everything else NWS Springfield, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 10:25 PM CDT	Special Weather Statement	SGF	Taney	50 min
Aug 20, 3:23 AM CDT	Heat Advisory	SGF	Barton, Jasper, McDonald, Newton, Vernon	16 hr
Aug 20, 9:31 AM CDT	Severe Thunderstorm Warning	SGF	Dallas, Laclede, Webster	29 min
Aug 20, 9:58 AM CDT	Special Weather Statement	SGF	Webster, Wright	47 min
Aug 20, 11:13 AM CDT	Special Weather Statement	SGF	Texas	47 min
Aug 20, 11:37 AM CDT	Severe Thunderstorm Warning	SGF	Shannon, Texas	38 min
Aug 20, 12:06 PM CDT	Special Weather Statement	SGF	Howell	39 min
Aug 20, 12:12 PM CDT	Special Weather Statement	SGF	Shannon	48 min
Aug 20, 12:16 PM CDT	Special Weather Statement	SGF	Dent	44 min
Aug 20, 12:46 PM CDT	Severe Thunderstorm Warning	SGF	Howell, Oregon	29 min
Aug 20, 12:51 PM CDT	Severe Thunderstorm Warning	SGF	Shannon	24 min
Aug 20, 1:50 PM CDT	Special Weather Statement	SGF	Oregon	40 min
Aug 20, 5:15 PM CDT	Special Weather Statement	SGF	Cedar	45 min
Aug 20, 5:32 PM CDT	Special Weather Statement	SGF	St. Clair	43 min
Aug 20, 6:11 PM CDT	Special Weather Statement	SGF	Cedar, Dade	49 min
Aug 20, 6:35 PM CDT	Special Weather Statement	SGF	St. Clair	40 min
Aug 20, 6:43 PM CDT	Severe Thunderstorm Warning	SGF	Dade, Polk	32 min
Aug 20, 6:54 PM CDT	Areal Flood Advisory	SGF	Cedar, Dade, Polk	6 hr

Nearby

Special Weather Statements in Missouri, 2017 Every special weather statement in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.