Alert archive / Colorado / Mesoscale Discussions in 2004
Mesoscale Discussion 821
The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 12:13 PM MDT for 10 counties in Colorado; Cheyenne County, Kansas; 8 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 22, 2004, 12:13 PM MDT (18:13 UTC)
- Expired
- May 22, 2004, 2:15 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Adams County, CO, Arapahoe County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Banner County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Keith County, NE, Kimball County, NE, Perkins County, NE
The radar
The Denver radar (KFTG), 123 km from the middle of the area, began a volume at 18:13 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
Denver, CO (KDNR), launched 12:00Z, 6.2 hours before the alert went out and 19 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2107 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
903 ACUS11 KWNS 221813 SWOMCD SPC MCD 221813 NEZ000-KSZ000-COZ000-222015- MESOSCALE DISCUSSION 0821 NWS STORM PREDICTION CENTER NORMAN OK 0113 PM CDT SAT MAY 22 2004 AREAS AFFECTED...NERN CO...EXTREME SWRN NEBRASKA...EXTREME NWRN KS CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 221813Z - 222015Z SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS AND ISOLATED TORNADOES WILL FORM BY 20Z OVER NERN CO...POSSIBLY EXTENDING EWD INTO EXTREME NWRN KS. WW WILL BE ISSUED BEFORE 20Z. LATEST VISIBLE IMAGERY INDICATES INCREASING TREND IN TCU / CB DEVELOPMENT OVER CO AND WY INTO WRN NEB...AS UPPER SHORTWAVE TROUGH AND ASSOCIATED COOLING/LIFT MOVE NEWD OVER CO. AT THE SURFACE...AXIS OF 50 + DEWPOINTS EXTENDS INTO NERN CO. A CONTINUATION OF STRONG HEATING...MOISTURE ADVECTION AND CONVERGENCE ALONG DEVELOPING WARM FRONT WILL ALLOW FOR RAPID DESTABILIZATION AND THE FORMATION OF SUPERCELL THUNDERSTORMS. THESE STORMS WILL HAVE THE POTENTIAL FOR LARGE HAIL...DAMAGING WIND...AND ISOLATED TORNADOES. TORNADO THREAT WILL BE HIGHEST WITHIN MOIST AXIS WHERE BOUNDARY LAYER RH WILL BE HIGHEST AND SURFACE WINDS BACKED. HAIL THREAT WILL INCREASE THROUGH THE AFTERNOON HOURS WITH THE THREAT OF EXTREMELY DAMAGING HAIL STORMS BY THE TIME STORMS ENTER SWRN NEBRASKA...WHERE INSTABILITY WILL BE STRONG. ..JEWELL.. 05/22/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LBF...GLD...BOU...CYS... 38980202 38910265 39160360 39500406 39830496 40700489 40980400 41580378 41170127 40450121
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 1:00 PM MDT | Tornado Watch | SPC | Elbert, Kit Carson, Logan, Morgan, Phillips, Sedgwick and 2 more | 6 hr |
| May 22, 2:04 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Kit Carson, Logan, Morgan, Phillips and 4 more | 86 min |
| May 21, 6:40 PM MDT | Tornado Watch | SPC | Cloud, Jewell, Mitchell, Osborne, Phillips, Republic and 2 more | 5 hr |
| May 21, 7:40 PM MDT | Mesoscale Discussion | SPC | Clark, Edwards, Ellis, Ford, Gray, Hodgeman and 8 more | 95 min |
| May 21, 9:01 PM MDT | Mesoscale Discussion | SPC | Cloud, Jewell, Mitchell, Osborne, Phillips, Republic and 2 more | 89 min |
| May 22, 2:52 PM MDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Clay, Cloud, Comanche and 20 more | 83 min |
| May 22, 4:50 PM MDT | Tornado Watch | SPC | Barton, Clay, Cloud, Dickinson, Ellsworth, Geary and 13 more | 5 hr |
| May 21, 8:55 PM MDT | Tornado Watch | SPC | Burt, Cuming, Dakota, Dixon, Dodge, Thurston and 1 more | 4 hr |
| May 21, 11:25 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 29 more | 2 hr |
| May 21, 11:55 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Boone, Buffalo, Burt, Butler, Cass and 31 more | 5 hr |
| May 22, 2:44 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Burt, Butler, Cass, Clay and 20 more | 61 min |
| May 22, 2:02 PM MDT | Mesoscale Discussion | SPC | Adams, Butler, Cass, Clay, Douglas, Fillmore and 22 more | 58 min |
| May 22, 2:45 PM MDT | Tornado Watch | SPC | Adams, Boone, Buffalo, Burt, Butler, Cass and 44 more | 7 hr |
Nearby
Mesoscale Discussions in Colorado, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Kansas, 2004Every mesoscale discussion in 2004
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.