Skip to content

Severe Thunderstorm Watch 18

February 20, 2014

Severe Thunderstorm Watch 18

ww0018_radar

Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2″+ Hail
Very Low Very Low

Note: The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
SEL8

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 18
NWS STORM PREDICTION CENTER NORMAN OK
920 PM EST THU FEB 20 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHEAST INDIANA NORTHERN AND WESTERN OHIO

* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 920 PM UNTIL 400 AM EST.

* PRIMARY THREATS INCLUDE…SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHWEST OF TOLEDO OHIO TO 35 MILES SOUTHWEST OF DAYTON OHIO. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

REMEMBER…A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES.

&&

OTHER WATCH INFORMATION…CONTINUE…WW 11WW 14WW 15WW 16WW 17

DISCUSSION…NRN END OF COLD FRONTAL SQLN NOW E IND EXPECTED TO CONTINUE NNEWD INTO NW OH LATER TNGT AS MID-LVL FLOW CONTINUES TO BACK AND STRENGTHEN AHEAD OF POTENT MIDWESTERN SHORTWAVE TROUGH. AREA SFC AND VWP DATA…MEANWHILE…SHOW SUBSTANTIAL LOW-LVL WLY COMPONENT TO WINDS BEHIND COLD FRONT IN NRN IND. COUPLED WITH INCREASING FORCING FOR ASCENT AND STRENGTHENING OF DEEP WIND FIELD…SETUP APPEARS SUPPORTIVE OF SPORADIC DMGG SFC GUSTS…DESPITE SHALLOW BOUNDARY LAYER INVERSION/SNOW COVER OVER REGION.

AVIATION…A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM MOTION VECTOR 23055.

BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 18
NWS STORM PREDICTION CENTER NORMAN OK
920 PM EST THU FEB 20 2014

SEVERE THUNDERSTORM WATCH 18 IS IN EFFECT UNTIL 400 AM EST FOR THE FOLLOWING LOCATIONS

. INDIANA COUNTIES INCLUDED ARE

ADAMS ALLEN BLACKFORD
DE KALB JAY STEUBEN
WELLS

. OHIO COUNTIES INCLUDED ARE

ALLEN AUGLAIZE CHAMPAIGN
CLARK CLERMONT CRAWFORD
DARKE DEFIANCE FULTON
GREENE HANCOCK HARDIN
HENRY LOGAN LUCAS
MARION MERCER MIAMI
MONTGOMERY OTTAWA PAULDING
PREBLE PUTNAM SANDUSKY
SENECA SHELBY UNION
VAN WERT WARREN WILLIAMS
WOOD WYANDOT

Note: Click for Complete Product Text.
Tornadoes

Probability of 2 or more tornadoes

Low (10%)

Probability of 1 or more strong (F2-F5) tornadoes

Low (<2%)

Wind

Probability of 10 or more severe wind events

Mod (40%)

Probability of 1 or more wind events > 65 knots

Low (20%)

Hail

Probability of 10 or more severe hail events

Low (<5%)

Probability of 1 or more hailstones > 2 inches

Low (<5%)

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.

Advertisements

From → Weather Blog

Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: