Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 477

April 16, 20034 counties in Kansas; 18 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2003, 2:01 AM CDT for 4 counties in Kansas; 18 counties in Oklahoma. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 16, 2003, 2:01 AM CDT (07:01 UTC)
Expired: Apr 16, 2003, 4:00 AM CDT
In force: 119 min
Issued by: the Storm Prediction Center

All 22 counties

Allen County, KS, Cherokee County, KS, Labette County, KS, Neosho County, KS, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 20 km from the middle of the area, began a volume at 07:00 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 00:00Z, 7.0 hours before the alert went out and 160 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2736 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

368 
ACUS11 KWNS 160702
SWOMCD
SPC MCD 160701 
OKZ000-KSZ000-160900-

MESOSCALE DISCUSSION 0477
NWS STORM PREDICTION CENTER NORMAN OK
0201 AM CDT WED APR 16 2003

AREAS AFFECTED...SERN KS...ERN OK

CONCERNING...SEVERE THUNDERSTORM WATCH 125...

VALID 160701Z - 160900Z

THREAT FOR MAINLY ISOLATED DAMAGING WIND GUSTS AND MARGINALLY
SEVERE HAIL EXPECTED TO PERSIST THROUGH 09Z MAINLY OVER PARTS OF
ERN OK WITH A MORE MARGINAL THREAT IN SERN KS.

DRY SURGE ASSOCIATED WITH STRONG MID/UPPER JET CONTINUES TO SHIFT
EWD THROUGH KS AND ERN OK. STORMS CONTINUE DEVELOPING WITHIN ZONE
OF ENHANCED CONVERGENCE IN EXIT REGION OF THE UPPER JET AND ALONG
THE 60+ KT LOW LEVEL JET. OVERALL TREND HAS BEEN FOR ACTIVITY TO
WEAKEN AS STORMS SHIFT E OF PRIMARY INSTABILITY AXIS. THIS
SUGGESTS THREAT FOR HAIL SHOULD LESSEN. HOWEVER...STRENGTH OF
FORCING AND LOW-MID LEVEL FLOW WILL MAINTAIN THREAT FOR ISOLATED
DAMAGING WIND GUSTS ASSOCIATED WITH BOWING SEGMENTS AS STORMS
CONTINUE THROUGH ERN OK.

..DIAL.. 04/16/2003

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

ATTN...WFO...SGF...TSA...ICT...OUN...

35539636 36889564 37939568 37969507 37279478 36099455
34979456 34749600

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 9:04 PM CDT	Mesoscale Discussion	SPC	Barber, Harper, Harvey, Kingman, Pratt, Reno and 3 more	86 min
Apr 15, 11:20 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Butler, Chautauqua, Cherokee, Crawford, Elk and 6 more	6 hr
Apr 16, 12:49 AM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Chase, Clay, Coffey, Douglas and 17 more	116 min
Apr 15, 7:11 PM CDT	Mesoscale Discussion	SPC	Comanche, Harmon, Jackson, Tillman	2 hr
Apr 15, 8:35 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Creek, Garvin, Grady, Jefferson and 16 more	115 min
Apr 15, 9:00 PM CDT	Tornado Watch	SPC	Carter, Cleveland, Coal, Creek, Garvin, Grady and 15 more	5 hr
Apr 15, 11:00 PM CDT	Mesoscale Discussion	SPC	Canadian, Carter, Cleveland, Coal, Cotton, Creek and 21 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2003 Mesoscale Discussions in Kansas, 2003 Every mesoscale discussion in 2003

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.