Alert archive / Missouri / Special Weather Statements in 2011

Special Weather Statement, NWS Springfield, MO

August 20, 20114 counties in Missouri

NWS Springfield, MO issued this special weather statement at Aug 20, 2011, 5:21 AM CDT for 4 counties in Missouri. It was in force for 54 min. 6 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 20, 2011, 5:21 AM CDT (10:21 UTC)
Expired: Aug 20, 2011, 6:15 AM CDT
In force: 54 min
Issued by: NWS Springfield, MO

Counties Camden County, MO, Maries County, MO, Miller County, MO, Pulaski County, MO

The radar

The Springfield radar (KSGF), 137 km from the middle of the area, began a volume at 10:24 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.

What was reported inside it

Time	Report	Where	Remark
Aug 20, 5:25 AM CDT	TSTM WND DMG	Lake Ozark, MO	TREE DOWN ON THE MILLER AND CAMDEN COUNTY LINE. REPORT VIA CAMDEN COUNTY 911.
Aug 20, 5:35 AM CDT	TSTM WND DMG	Bagnell, MO	POWER LINES REPORTED DOWN IN THE WESTERN PORTION OF MILLER COUNTY.
Aug 20, 5:52 AM CDT	TSTM WND GST 52	Dixon, MO
Aug 20, 6:00 AM CDT	TSTM WND DMG	7 W Vienna, MO	TREE DOWN ON HWY 42.
Aug 20, 6:00 AM CDT	TSTM WND DMG	Iberia, MO	WEATHER OBSERVER REPORTED A COUPLE TREES BLOWN DOWN.
Aug 20, 6:20 AM CDT	TSTM WND GST 70	Doolittle, MO	ESTIMATED 60 TO 70 MPH WINDS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 10.4 hours before the alert went out and 189 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: 2387 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1498 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

688 
WWUS83 KSGF 201021
SPSSGF

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
521 AM CDT SAT AUG 20 2011

MOZ057-058-069>071-081-201115-
CAMDEN MO-LACLEDE MO-MARIES MO-MILLER MO-PHELPS MO-PULASKI MO-
521 AM CDT SAT AUG 20 2011

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CAMDEN...MILLER...
NORTHERN LACLEDE...PULASKI...WESTERN MARIES AND WESTERN PHELPS
COUNTIES UNTIL 615 AM CDT...

AT 520 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM OLEAN TO TUSCUMBIA
TO BRUMLEY TO 5 MILES SOUTHEAST OF DECATURVILLE TO 11 MILES SOUTHWEST
OF ELDRIDGE...MOVING EAST AT 40 MPH. NICKEL SIZE HAIL...AND WINDS
AROUND 50 MPH ARE EXPECTED WITH THESE STORMS.

LAT...LON 3843 9241 3834 9240 3833 9223 3834 9220
      3830 9218 3830 9184 3769 9188 3768 9285
      3772 9285 3822 9272 3822 9270 3835 9268
      3835 9264 3844 9262
TIME...MOT...LOC 1020Z 286DEG 36KT 3842 9248 3827 9247
          3807 9248 3786 9265 3774 9292

$$
DSA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 3:35 AM CDT	Special Weather Statement	SGF	Benton, Morgan	55 min
Aug 20, 4:15 AM CDT	Special Weather Statement	SGF	Benton, Morgan	60 min
Aug 20, 4:43 AM CDT	Special Weather Statement	SGF	Camden, Miller, Morgan	62 min
Aug 20, 5:23 AM CDT	Special Weather Statement	SGF	Camden, Maries, Miller, Pulaski	52 min
Aug 20, 5:46 AM CDT	Severe Thunderstorm Warning	SGF	Maries, Miller, Phelps, Pulaski	59 min
Aug 20, 6:28 AM CDT	Severe Thunderstorm Warning	SGF	Dent, Phelps, Texas	62 min
Aug 20, 7:10 AM CDT	Severe Thunderstorm Warning	SGF	Dent, Howell, Shannon, Texas	65 min
Aug 20, 5:20 PM CDT	Special Weather Statement	SGF	Lawrence	25 min
Aug 20, 5:25 PM CDT	Severe Thunderstorm Warning	SGF	Lawrence	65 min
Aug 20, 5:51 PM CDT	Severe Thunderstorm Warning	SGF	Barry, Christian, Lawrence, Stone	39 min
Aug 20, 6:27 PM CDT	Special Weather Statement	SGF	Ozark	33 min
Aug 20, 6:30 PM CDT	Severe Thunderstorm Warning	SGF	Christian, Stone, Taney	45 min

Nearby

Special Weather Statements in Missouri, 2011 Every special weather statement in 2011

Sources

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