Mesoscale Discussion 968

Issued

Jun 7, 2009, 4:45 AM CDT (09:45 UTC)

Expired

Jun 7, 2009, 5:15 AM CDT

In force

30 min

Issued by

the Storm Prediction Center

The Des Moines radar (KDMX), 156 km from the middle of the area, began a volume at 09:48 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.

000 
ACUS11 KWNS 070946
SWOMCD
SPC MCD 070945 
IAZ000-ILZ000-MOZ000-KSZ000-NEZ000-071015-

MESOSCALE DISCUSSION 0968
NWS STORM PREDICTION CENTER NORMAN OK
0445 AM CDT SUN JUN 07 2009

AREAS AFFECTED...NRN MO/SRN IA/NERN KS

CONCERNING...SEVERE THUNDERSTORM WATCH 340...

VALID 070945Z - 071015Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 340
CONTINUES.

LOCAL EXTENSION IN TIME OF WW 340 IS POSSIBLE...AS WELL AS THE
POTENTIAL FOR A NEW WW THIS MORNING ACROSS NERN KS TO NRN MO/SRN IA.

POTENTIAL EXISTS FOR LARGE HAIL TO PERSIST THROUGH AT LEAST 12Z WITH
ANY OF THE STRONGER CELLS ATTENDANT TO THE ONGOING MCS ACROSS NRN
MO/SRN-ERN IA...AND NEW DEVELOPMENT ACROSS NERN KS.  IN ADDITION...A
CORRIDOR OF TRAINING TSTMS ALONG THE SWRN IA/NWRN MO BORDER AREA
WILL CONTINUE TO HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY
RAINFALL RATES OF 1-2 IN/HR.

STRONG SWLY LLJ /50-60 KT/ EXTENDS FROM CENTRAL KS INTO THE SWRN
PERIPHERY OF THE LARGE MCS...WITH STRONG LOW LEVEL WAA MAINTAINING
NEW TSTM DEVELOPMENT ACROSS NERN KS/NWRN MO INTO SWRN IA.  ALTHOUGH
IR SATELLITE IMAGERY INDICATED A GRADUAL WARMING OF CLOUD
TOPS...COLDEST CLOUD TOP TEMPERATURES REMAIN ALONG THE SWRN
PERIPHERY OF THIS SYSTEM WHERE NEW TSTM DEVELOPMENT PERSISTS. 
CONTINUED FEED OF MODERATE INSTABILITY COMBINED WITH EFFECTIVE BULK
SHEAR AROUND 50 KT SUGGESTS STORMS WILL HAVE THE POTENTIAL TO
PRODUCE ISOLATED LARGE HAIL...UNTIL THE MCS DIMINISHES IN INTENSITY
BY MID MORNING WITH THE EVENTUAL WEAKENING OF THE LLJ.

..PETERS.. 06/07/2009

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

ATTN...WFO...LSX...DVN...DMX...EAX...OAX...TOP...

LAT...LON   39379371 39009483 38879587 38819726 39459729 40929579
            41359541 41509517 41679325 42189174 42079086 41259077
            39789141 39569273 39379371

Mesoscale Discussions in Iowa, 2009Mesoscale Discussions in Missouri, 2009Mesoscale Discussions in Kansas, 2009Every mesoscale discussion in 2009

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.