BLACK SWAN 17 OPBULL 8

Post date: Oct 7, 2017 4:21:38 PM

BLACK SWAN 17 EXERCISE DIRECTOR

C.M. CURTIN, SPC (OH), HHC/2/4 OHMR

CHARLES.CURTIN@OHMR.OHIO.GOV

+1 614 398 0045

KD8TTE BEXLEY OH 43209

R 071110Z OCT 2017

FM NNO5HD OHMR OH

TO ALL BLACK SWAN 17 EXERCISE PARTICIPANTS

BT

UNCLAS

SUBJ: BLACK SWAN 17 OPBULL 8

1. This bulletin contains the text of a simulated severe weather warning for the entire state of Iowa.
2. The simulated severe weather warning is to be transmitted to all BLACK SWAN 17 participants, complete with TEST / EXERCISE text, after 1100Z until 1400Z.
3. Participants are to adjust local play to accommodate this activity where possible, e.g., SKYWARN may activate spotters, CERT may activate damage assessment teams, etc.
4. Situation reports including simulated local severe weather and impact should be directed by TEST PRIORITY precedence radiogram to:

BLACK SWAN 17 KD8TTE

BEXLEY OH 43209

1. Reports received will be integrated into future bulletins in exercise play.
2. The remainder of this bulletin is text for transmission as instructed above.

THIS IS A TEST SEVERE THUNDERSTORM WATCH TO BE USED ONLY DURING A SEVERE THUNDERSTORM EXERCISE/SIMULATION ON OCTOBER 7, 2017. AGAIN…THIS MESSAGE IS FOR TEST PURPOSES ONLY. DO NOT TAKE ACTION BASED ON THIS MESSAGE.

TEST…TEST…TEST…IMMEDIATE BROADCAST REQUESTED

TEST…TEST…TEST…SEVERE THUNDERSTORM WATCH NUMBER 999

NWS STORM PREDICTION CENTER NORMAN OK

600 AM CDT SAT OCT 7 2017

THE NWS STORM PREDICTION CENTER HAS ISSUED A

TEST SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

IOWA

EFFECTIVE THIS SATURDAY MORNING FROM 600 AM UNTIL

900 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS THE STATE OF IOWA.

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.

DISCUSSION...A DEVELOPING MCS/BOW ECHO ACROSS SOUTH DAKOTA IS

EXPECTED TO MOVE ESEWD THROUGH THE MORNING AT ROUGHLY 50 KT. THE

STORM ENVIRONMENT DOWNSTREAM FEATURES STRONG INSTABILITY AND

SUFFICIENT DEEP-LAYER FLOW/SHEAR TO MAINTAIN AN ORGANIZED MCS...AND

THERE WILL BE THE POTENTIAL FOR WIDESPREAD DAMAGING WINDS /SOME

SIGNIFICANT/ WITH THIS BOWING SYSTEM THROUGH MID-DAY.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 650. MEAN STORM

MOTION VECTOR 29050.

THIS IS A TEST MESSAGE. DO NOT TAKE ACTION BASED ON THIS TEST

MESSAGE USED ONLY FOR A SEVERE THUNDERSTORM EXERCISE/SIMULATION.

BT

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