Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
435 PM CDT THU MAY 1 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF NORTHWEST IOWA
PARTS OF SOUTHWESTERN MINNESOTA
LARGE PART OF SOUTHEASTERN SOUTH DAKOTA
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 435 PM UNTIL
1100 PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF
HURON SOUTH DAKOTA TO 35 MILES EAST SOUTHEAST OF SPENCER IOWA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).
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.
DISCUSSION...STRONG SELY FLOW E OF DEEP SFC LOW JUST S OF
YKN...RESULTING IN AN INCREASINGLY MOIST/UNSTABLE AIR MASS MOVING
NWWD THRU WATCH AREA. THUNDERSTORMS WILL DEVELOP VICINITY COLD
FRONT THAT IS MOVING EWD THRU ERN NEB AND MOVE NWD THRU THE WATCH
AREA. STRONG VEERING SHEAR PROFILES SUPPORT SUPERCELLS INCLUDING
TORNADOES AND LARGE HAIL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 19025.
...HALES
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
435 PM CDT THU MAY 1 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF NORTHWEST IOWA
PARTS OF SOUTHWESTERN MINNESOTA
LARGE PART OF SOUTHEASTERN SOUTH DAKOTA
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 435 PM UNTIL
1100 PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF
HURON SOUTH DAKOTA TO 35 MILES EAST SOUTHEAST OF SPENCER IOWA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).
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.
DISCUSSION...STRONG SELY FLOW E OF DEEP SFC LOW JUST S OF
YKN...RESULTING IN AN INCREASINGLY MOIST/UNSTABLE AIR MASS MOVING
NWWD THRU WATCH AREA. THUNDERSTORMS WILL DEVELOP VICINITY COLD
FRONT THAT IS MOVING EWD THRU ERN NEB AND MOVE NWD THRU THE WATCH
AREA. STRONG VEERING SHEAR PROFILES SUPPORT SUPERCELLS INCLUDING
TORNADOES AND LARGE HAIL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 19025.
...HALES
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 243 TORNADO IA MN SD 012135Z - 020400Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
45WSW HON/HURON SD/ - 35ESE SPW/SPENCER IA/
..AVIATION COORDS.. 50NM N/S /50ESE PIR - 24NNW FOD/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 19025.
LAT...LON 45009906 43849451 42119451 43259906
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 243 Status Report Messages:
STATUS REPORT #4 ON WW 243
VALID 020145Z - 020240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SW SLB TO
40 SSW OTG TO 10 ENE 9V9.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 762
..GUYER..05/02/08
ATTN...WFO...FSD...DMX...ABR...
&&
STATUS REPORT FOR WT 243
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC021-025-035-041-059-063-093-119-141-143-147-151-161-167-
020240-
IA
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CALHOUN CHEROKEE
CLAY DICKINSON EMMET
IDA LYON O'BRIEN
OSCEOLA PALO ALTO POCAHONTAS
SAC SIOUX
$$
MNC033-063-081-083-101-105-117-133-020240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
COTTONWOOD JACKSON LINCOLN
LYON MURRAY NOBLES
PIPESTONE ROCK
$$
SDC003-005-011-017-025-035-049-057-059-061-069-073-077-079-087-
097-099-101-111-115-020240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
AURORA BEADLE BROOKINGS
BUFFALO CLARK DAVISON
FAULK HAMLIN HAND
HANSON HYDE JERAULD
KINGSBURY LAKE MCCOOK
MINER MINNEHAHA MOODY
SANBORN SPINK
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 243
VALID 020030Z - 020140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GUYER..05/02/08
ATTN...WFO...FSD...DMX...ABR...
&&
STATUS REPORT FOR WT 243
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC021-025-035-041-059-063-093-119-141-143-147-149-151-161-167-
020140-
IA
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CALHOUN CHEROKEE
CLAY DICKINSON EMMET
IDA LYON O'BRIEN
OSCEOLA PALO ALTO PLYMOUTH
POCAHONTAS SAC SIOUX
$$
MNC033-063-081-083-101-105-117-133-020140-
MN
. MINNESOTA COUNTIES INCLUDED ARE
COTTONWOOD JACKSON LINCOLN
LYON MURRAY NOBLES
PIPESTONE ROCK
$$
SDC003-005-009-011-015-017-023-025-027-035-043-049-057-059-061-
067-069-073-077-079-083-087-097-099-101-111-115-125-127-135-
020140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
AURORA BEADLE BON HOMME
BROOKINGS BRULE BUFFALO
CHARLES MIX CLARK CLAY
DAVISON DOUGLAS FAULK
HAMLIN HAND HANSON
HUTCHINSON HYDE JERAULD
KINGSBURY LAKE LINCOLN
MCCOOK MINER MINNEHAHA
MOODY SANBORN SPINK
TURNER UNION YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 243
VALID 012350Z - 020040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 243
..GUYER..05/01/08
ATTN...WFO...FSD...DMX...ABR...
&&
STATUS REPORT FOR WT 243
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC021-025-035-041-059-063-093-119-141-143-147-149-151-161-167-
020040-
IA
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CALHOUN CHEROKEE
CLAY DICKINSON EMMET
IDA LYON O'BRIEN
OSCEOLA PALO ALTO PLYMOUTH
POCAHONTAS SAC SIOUX
$$
MNC033-063-081-083-101-105-117-133-020040-
MN
. MINNESOTA COUNTIES INCLUDED ARE
COTTONWOOD JACKSON LINCOLN
LYON MURRAY NOBLES
PIPESTONE ROCK
$$
SDC003-005-009-011-015-017-023-025-027-035-043-049-057-059-061-
067-069-073-077-079-083-087-097-099-101-111-115-125-127-135-
020040-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
AURORA BEADLE BON HOMME
BROOKINGS BRULE BUFFALO
CHARLES MIX CLARK CLAY
DAVISON DOUGLAS FAULK
HAMLIN HAND HANSON
HUTCHINSON HYDE JERAULD
KINGSBURY LAKE LINCOLN
MCCOOK MINER MINNEHAHA
MOODY SANBORN SPINK
TURNER UNION YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 243
VALID 012240Z - 012340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GUYER..05/01/08
ATTN...WFO...FSD...DMX...ABR...
&&
STATUS REPORT FOR WT 243
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC021-025-035-041-059-063-093-119-141-143-147-149-151-161-167-
012340-
IA
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CALHOUN CHEROKEE
CLAY DICKINSON EMMET
IDA LYON O'BRIEN
OSCEOLA PALO ALTO PLYMOUTH
POCAHONTAS SAC SIOUX
$$
MNC033-063-081-083-101-105-117-133-012340-
MN
. MINNESOTA COUNTIES INCLUDED ARE
COTTONWOOD JACKSON LINCOLN
LYON MURRAY NOBLES
PIPESTONE ROCK
$$
SDC003-005-009-011-015-017-023-025-027-035-043-049-057-059-061-
067-069-073-077-079-083-087-097-099-101-111-115-125-127-135-
012340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
AURORA BEADLE BON HOMME
BROOKINGS BRULE BUFFALO
CHARLES MIX CLARK CLAY
DAVISON DOUGLAS FAULK
HAMLIN HAND HANSON
HUTCHINSON HYDE JERAULD
KINGSBURY LAKE LINCOLN
MCCOOK MINER MINNEHAHA
MOODY SANBORN SPINK
TURNER UNION YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (40%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.