Alert archive / Missouri / Mesoscale Discussions in 2006

Mesoscale Discussion 1721

August 2, 20066 counties in Iowa; 10 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2006, 11:37 PM CDT for 6 counties in Iowa; 10 counties in Missouri. It was in force for 23 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2006, 11:37 PM CDT (04:37 UTC)
Expired
Aug 3, 2006, 12:00 AM CDT
In force
23 min
Issued by
the Storm Prediction Center

Counties Appanoose County, IA, Clarke County, IA, Decatur County, IA, Lucas County, IA, Monroe County, IA, Wayne County, IA, Adair County, MO, Chariton County, MO, Grundy County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Sullivan County, MO

The radar

The Des Moines radar (KDMX), 172 km from the middle of the area, began a volume at 04:37 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

Topeka, KS (KTOP), launched 00:00Z, 4.6 hours before the alert went out and 242 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-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2006-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 807 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2006-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
807 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
2577 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 030437
SWOMCD
SPC MCD 030437 
MOZ000-IAZ000-030500-

MESOSCALE DISCUSSION 1721
NWS STORM PREDICTION CENTER NORMAN OK
1137 PM CDT WED AUG 02 2006

AREAS AFFECTED...SOUTH CENTRAL-SERN IA / NORTH CENTRAL-NERN MO

CONCERNING...SEVERE THUNDERSTORM WATCH 675...

VALID 030437Z - 030500Z

WW 675 WILL BE ALLOWED TO EXPIRE AT 05Z.

FORWARD PROPAGATING MCS WILL CONTINUE TO MOVE ENE TOWARD SERN IA/
NERN MO AND WRN IL THE NEXT SEVERAL HOURS...BUT WEAKENING LOW LEVEL
LAPSE RATES SUGGEST OVERALL THREAT FOR ADDITIONAL DAMAGING WINDS IS
VERY LOW.  SURFACE OBSERVATIONS DURING THE PAST HOUR AT SZL...CDJ
AND LWD WITH THE PASSAGE OF THE LEADING EDGE OF THE MCS INDICATED
SUB-SEVERE WIND GUSTS. THIS TREND IS EXPECTED TO CONTINUE AS
ACTIVITY MOVES ENE TOWARD WRN IL.

..PETERS.. 08/03/2006

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LSX...DMX...EAX...

39499404 39879378 40859380 41069391 41109309 41099248
40129233 39689241 39419302

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 7:53 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Henry, Jefferson, Lee and 5 more2 hr
Aug 3, 2:26 PM CDTMesoscale DiscussionSPCButler, Dunklin, Mississippi, New Madrid, Pemiscot, Ripley and 2 more2 hr

Nearby

Mesoscale Discussions in Missouri, 2006Mesoscale Discussions in Iowa, 2006Every mesoscale discussion in 2006

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.