Alert archive / Iowa / Tornado Watches in 2005
Tornado Watch 878
The Storm Prediction Center issued this tornado watch at Nov 27, 2005, 5:38 PM CST for 24 counties in Iowa. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 27, 2005, 5:38 PM CST (23:38 UTC)
- Expired
- Nov 27, 2005, 8:51 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Guthrie County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 63 km from the middle of the area, began a volume at 23:41 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.
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 27, 5:39 PM CST | Severe Thunderstorm Warning | DMX | Lucas | 16 min |
| Nov 27, 5:44 PM CST | Severe Thunderstorm Warning | DMX | Warren | 36 min |
| Nov 27, 6:11 PM CST | Severe Thunderstorm Warning | DMX | Marion | 17 min |
| Nov 27, 6:14 PM CST | Severe Thunderstorm Warning | DMX | Jasper, Polk | 46 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.6 hours before the alert went out and 191 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
- 623 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 146 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 272335
SEL8
SPC WW 272335
IAZ000-280600-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 878
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CST SUN NOV 27 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTH CENTRAL IOWA
EFFECTIVE THIS SUNDAY AFTERNOON FROM 535 PM UNTIL MIDNIGHT CST.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 75 MILES WEST NORTHWEST OF LAMONI
IOWA TO 10 MILES NORTHEAST OF OTTUMWA IOWA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 875...WW 876...WW 877...
DISCUSSION...SCATTERED STRONG/SEVERE THUNDERSTORMS WILL MOVE FROM
NORTHERN MO INTO SOUTH CENTRAL IA DURING THE EVENING HOURS. DESPITE
COOL SURFACE AIRMASS...SUFFICIENT INSTABILITY ALOFT AND RAPID LOW
LEVEL DESTABILIZATION PRESENTS SOME THREAT OF SURFACE-BASED STORMS.
VERY STRONG WIND FIELDS WILL PROMOTE SUPERCELL STORMS AND THE
POTENTIAL FOR DAMAGING WINDS AND BRIEF TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 22040.
...HART
414,0951 415,0921 403,0921 402,0951SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 27, 3:29 PM CST | Mesoscale Discussion | SPC | Adair, Adams, Cass, Clarke, Decatur, Fremont and 10 more | 2 hr |
| Nov 27, 12:36 PM CST | Tornado Watch | SPC | Barton, Jasper, McDonald, Newton, Vernon | 7 hr |
| Nov 27, 2:50 PM CST | Mesoscale Discussion | SPC | Andrew, Barry, Barton, Bates, Benton, Boone and 50 more | 115 min |
| Nov 27, 3:05 PM CST | Tornado Watch | SPC | Adair, Andrew, Atchison, Barry, Bates, Benton and 65 more | 7 hr |
| Nov 27, 4:39 PM CST | Mesoscale Discussion | SPC | Butler, Carter, Dunklin, New Madrid, Pemiscot, Ripley and 2 more | 96 min |
| Nov 27, 5:58 PM CST | Mesoscale Discussion | SPC | Andrew, Barry, Bates, Benton, Boone, Buchanan and 52 more | 92 min |
Nearby
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.