ZJX CTLR DESCRIBED LACK OF TMU SUPPORT DURING BUSY/COMPLEX TFC ROUTED INTO ZDC AIRSPACE.

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WHILE INSTRUCTING AT R68; I OBSERVED WHAT I BELIEVE TO BE AN UNSAFE SIT. DUE TO SEVERE WX IN THE NORTHEASTERN UNITED STATES THERE WERE HUGE MI-IN-TRAIL (MIT) FLOW RESTRS BACKED UP TO ZJX FROM ZDC. AT THIS TIME; OUR SECTOR WAS REQUIRED TO PROVIDE THE NEXT SECTOR WITH 40 MI-IN-TRAIL ON ALL ACFT LNDG IN THE WASHINGTON; DC AREA; MEANING 40 MI-IN-TRAIL AS ONE TO DCA; IAD; BWI; AND ADW. THE ZJX TMU IS RESPONSIBLE FOR ENSURING THAT ZJX COMPLIES WITH THE RESTRS; AND THEY ARE RESPONSIBLE FOR ENSURING THE EDCT AND RELEASE TIMES ARE COMPLIED WITH FOR DEPS IN ZJX AIRSPACE. DUE TO THE FAILURE OF ZJX TMU TO DO THEIR JOBS; OUR SECTOR RECEIVED 2 IAD ARRS WITH NO MORE THAN 8 MI-IN-TRAIL. 1 ACFT DEPARTED MLB; THE OTHER DEPARTED MCO. ZJX TMU DROPPED THE BALL BY LETTING THESE ACFT OFF TOGETHER. BECAUSE OF THIS MISTAKE; WE WERE FORCED TO APPLY HVY SPD REDUCTION AND EXCESSIVE VECTORING TO ACHIEVE THE REQUIRED MI-IN-TRAIL. THIS WAS A VERY DANGEROUS SIT; AS OUR VECTOR WAS BEING IMPACTED BY SEVERE WX FROM CRG TO SAV AND NE TO CHS. WE WERE VERY BUSY WITH DEVS; VOLUME; AND WX ADVISORIES. VECTORING AND/OR SLOWING AN ACFT EXCESSIVELY DURING A PERIOD OF HVY DEVS IS; I FEEL VERY UNSAFE. WE COMMENTED ON THIS SIT TO OUR SUPVR; WHO RELAYED THE COMPLAINT TO TMU. APPROX 15 MINS LATER WE WERE FACED WITH THE EXACT SAME SIT. FLOW CTL ALLOWED THE RELEASE OF A BWI ARR OFF OF MCO NEAR THE TIME THEY ALLOWED A DCA ARR OFF OF TPA. THESE ACFT ARRIVED IN OUR SECTOR WITH LESS THAN 5 MI-IN-TRAIL. IT IS THE JOB OF TMU TO ENSURE THAT THIS EXACT SCENARIO DOES NOT HAPPEN; ESPECIALLY DURING PERIODS OF SEVERE WX IN ZJX AIRSPACE. TMU AGAIN DID NOT DO THEIR JOBS; AND WE HAD TO ENGAGE IN THE UNSAFE PRACTICE OF EXTREME VECTORS AND SPD REDUCTION. TMU'S FAILURE TO DO THEIR JOB IS A CHRONIC PROB IN ZJX; AND I FEAR THAT IT WILL LEAD TO ACCIDENTS.