Alert archive / Kansas / Mesoscale Discussions in 2003
Mesoscale Discussion 621
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2003, 2:19 PM CDT for 17 counties in Kansas; 6 counties in Nebraska. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2003, 2:19 PM CDT (19:19 UTC)
- Expired
- Apr 29, 2003, 4:15 PM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
All 23 counties
Cloud County, KS, Ellis County, KS, Ellsworth County, KS, Graham County, KS, Jewell County, KS, Lincoln County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Russell County, KS, Saline County, KS, Smith County, KS, Trego County, KS, Franklin County, NE, Furnas County, NE, Harlan County, NE, Nuckolls County, NE, Thayer County, NE, Webster County, NE
The radar
The Grand Island radar (KUEX), 101 km from the middle of the area, began a volume at 19:21 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Dodge City, (KDDC), launched 12:00Z, 7.3 hours before the alert went out and 214 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.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -565 J/kg
- Mixed-layer LCL
- 1571 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
930 ACUS11 KWNS 291920 SWOMCD SPC MCD 291919 KSZ000-NEZ000-292115- MESOSCALE DISCUSSION 0621 NWS STORM PREDICTION CENTER NORMAN OK 0219 PM CDT TUE APR 29 2003 AREAS AFFECTED...SRN-SERN NE CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 291919Z - 292115Z SCATTERED ELEVATED THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS SCNTRL-SERN NE OVER THE NEXT FEW HOURS. ADDITIONAL STORMS WILL LIKELY INITIATE ACROSS NRN-CNTRL KS LATER THIS AFTERNOON. INITIALLY...LARGE HAIL WILL BE THE PRIMARY THREAT WITH THE ELEVATED CONVECTION NORTH OF THE FRONT. ADDITIONAL STORMS INITIATING ACROSS CNTRL AND NRN KS WILL HAVE A POTENTIAL FOR HAIL AND WIND. ISOLATED TORNADOES WILL ALSO BE POSSIBLE PARTICULARLY WITH SUPERCELLS. A WW WILL LIKELY BE NECESSARY WITHIN THE NEXT FEW HOURS. SLY FLOW SOUTH OF A WARM FRONT ACROSS NRN KS HAD BROUGHT UPPER 50 TO LOWER 60 F SFC DEWPOINTS INTO NRN KS AND SRN NE. SFC TEMPS IN THE 70S HAD RESULTING IN MLCAPE VALUES OF 1500-2000 J/KG IN THIS REGION. VIS SATELLITE SHOWED CU FIELD INCREASING IN SIZE ACROSS NRN KS. STORMS SHOULD INITIATE IN THIS AREA NEAR THE WARM FRONT AND MOVE EWD LATER THIS AFTERNOON. AS STORMS INTERACT WITH MODERATE TO STRONG DEEP LAYER SHEAR WITH 0-6 KM SHEAR VALUES OF 40 TO 50 KNOTS...A FEW SUPERCELLS MAY DEVELOP. INITIALLY...THE SUPERCELLS WILL BE CAPABLE OF LARGE HAIL AND WIND DAMAGE. AS THE LOW-LEVEL JET STRENGTHENS LATE THIS AFTERNOON...ISOLATED TORNADOES WILL BE POSSIBLE MAINLY IN THE VICINITY AND S OF THE WARM FRONT. OTHER ELEVATED CELLS N OF THE FRONT WILL BE CAPABLE LARGE HAIL. A WW WILL LIKELY BECOME NECESSARY LATER THIS AFTERNOON. ..BROYLES.. 04/29/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OAX...TOP...ICT...GID...DDC...GLD... 38619927 38830018 39370037 40250024 40499938 40459797 40349736 39779716 39089724 38799745 38629816
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 7:10 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 12 more | 2 hr |
| Apr 28, 11:50 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Rawlins | 2 hr |
| Apr 29, 2:15 AM CDT | Mesoscale Discussion | SPC | Decatur, Jewell, Norton, Phillips, Rawlins, Republic and 2 more | 3 hr |
| Apr 29, 3:40 PM CDT | Tornado Watch | SPC | Clay, Cloud, Decatur, Dickinson, Ellis, Ellsworth and 19 more | 5 hr |
| Apr 29, 4:10 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Logan, Rawlins, Scott, Sherman, Thomas and 1 more | 6 hr |
| Apr 29, 5:52 PM CDT | Mesoscale Discussion | SPC | Clay, Cloud, Decatur, Dickinson, Ellis, Ellsworth and 19 more | 53 min |
| Apr 29, 6:16 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Logan, Rawlins, Scott, Sherman, Thomas and 2 more | 119 min |
| Apr 29, 3:47 PM CDT | Mesoscale Discussion | SPC | Kimball | 118 min |
Nearby
Mesoscale Discussions in Kansas, 2003Mesoscale Discussions in Nebraska, 2003Every 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.